opengl/libagl2/src/egl.cpp

/*
**
** Copyright 2007 The Android Open Source Project
**
** Licensed under the Apache License Version 2.0(the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing software
** distributed under the License is distributed on an "AS IS" BASIS
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/mman.h>

#include <cutils/atomic.h>


#include <private/ui/android_natives_priv.h>

#include <hardware/copybit.h>

#include "gles2context.h"

// ----------------------------------------------------------------------------
namespace android
{
// ----------------------------------------------------------------------------

const unsigned int NUM_DISPLAYS = 1;

static pthread_mutex_t gInitMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t gErrorKeyMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_key_t gEGLErrorKey = -1;
#ifndef HAVE_ANDROID_OS
namespace gl {
pthread_key_t gGLKey = -1;
}; // namespace gl
#endif

template<typename T>
static T setError(GLint error, T returnValue)
{
   if (ggl_unlikely(gEGLErrorKey == -1)) {
      pthread_mutex_lock(&gErrorKeyMutex);
      if (gEGLErrorKey == -1)
         pthread_key_create(&gEGLErrorKey, NULL);
      pthread_mutex_unlock(&gErrorKeyMutex);
   }
   pthread_setspecific(gEGLErrorKey, (void*)error);
   return returnValue;
}

static GLint getError()
{
   if (ggl_unlikely(gEGLErrorKey == -1))
      return EGL_SUCCESS;
   GLint error = (GLint)pthread_getspecific(gEGLErrorKey);
   if (error == 0) {
      // The TLS key has been created by another thread, but the value for
      // this thread has not been initialized.
      return EGL_SUCCESS;
   }
   pthread_setspecific(gEGLErrorKey, (void*)EGL_SUCCESS);
   return error;
}

// ----------------------------------------------------------------------------

struct egl_display_t {
   egl_display_t() : type(0), initialized(0) { }

   static egl_display_t& get_display(EGLDisplay dpy);

   static EGLBoolean is_valid(EGLDisplay dpy) {
      return ((uintptr_t(dpy)-1U) >= NUM_DISPLAYS) ? EGL_FALSE : EGL_TRUE;
   }

   NativeDisplayType   type;
   volatile int32_t    initialized;
};

static egl_display_t gDisplays[NUM_DISPLAYS];

egl_display_t& egl_display_t::get_display(EGLDisplay dpy)
{
   return gDisplays[uintptr_t(dpy)-1U];
}

// ----------------------------------------------------------------------------

struct egl_surface_t {
   enum {
      PAGE_FLIP = 0x00000001,
      MAGIC     = 0x31415265
   };

   uint32_t            magic;
   EGLDisplay          dpy;
   EGLConfig           config;
   EGLContext          ctx;

   egl_surface_t(EGLDisplay dpy, EGLConfig config, int32_t depthFormat);
   virtual     ~egl_surface_t();
   bool    isValid() const;
   virtual     bool    initCheck() const = 0;

   virtual     EGLBoolean  bindDrawSurface(GLES2Context* gl) = 0;
   virtual     EGLBoolean  bindReadSurface(GLES2Context* gl) = 0;
   virtual     EGLBoolean  connect() {
      return EGL_TRUE;
   }
   virtual     void        disconnect() {}
   virtual     EGLint      getWidth() const = 0;
   virtual     EGLint      getHeight() const = 0;

   virtual     EGLint      getHorizontalResolution() const;
   virtual     EGLint      getVerticalResolution() const;
   virtual     EGLint      getRefreshRate() const;
   virtual     EGLint      getSwapBehavior() const;
   virtual     EGLBoolean  swapBuffers();
   virtual     EGLBoolean  setSwapRectangle(EGLint l, EGLint t, EGLint w, EGLint h);
protected:
   GGLSurface              depth;
};

egl_surface_t::egl_surface_t(EGLDisplay dpy,
                             EGLConfig config,
                             int32_t depthFormat)
      : magic(MAGIC), dpy(dpy), config(config), ctx(0)
{
   depth.version = sizeof(GGLSurface);
   depth.data = 0;
   depth.format = (GGLPixelFormat)depthFormat;
}
egl_surface_t::~egl_surface_t()
{
   magic = 0;
   free(depth.data);
}
bool egl_surface_t::isValid() const
{
   LOGE_IF(magic != MAGIC, "invalid EGLSurface (%p)", this);
   return magic == MAGIC;
}

EGLBoolean egl_surface_t::swapBuffers()
{
   return EGL_FALSE;
}
EGLint egl_surface_t::getHorizontalResolution() const
{
   return (0 * EGL_DISPLAY_SCALING) * (1.0f / 25.4f);
}
EGLint egl_surface_t::getVerticalResolution() const
{
   return (0 * EGL_DISPLAY_SCALING) * (1.0f / 25.4f);
}
EGLint egl_surface_t::getRefreshRate() const
{
   return (60 * EGL_DISPLAY_SCALING);
}
EGLint egl_surface_t::getSwapBehavior() const
{
   return EGL_BUFFER_PRESERVED;
}
EGLBoolean egl_surface_t::setSwapRectangle(
   EGLint l, EGLint t, EGLint w, EGLint h)
{
   return EGL_FALSE;
}

// ----------------------------------------------------------------------------

struct egl_window_surface_v2_t : public egl_surface_t {
   egl_window_surface_v2_t(
      EGLDisplay dpy, EGLConfig config,
      int32_t depthFormat,
      ANativeWindow* window);

   ~egl_window_surface_v2_t();

   virtual     bool        initCheck() const {
      return true;   // TODO: report failure if ctor fails
   }
   virtual     EGLBoolean  swapBuffers();
   virtual     EGLBoolean  bindDrawSurface(GLES2Context* gl);
   virtual     EGLBoolean  bindReadSurface(GLES2Context* gl);
   virtual     EGLBoolean  connect();
   virtual     void        disconnect();
   virtual     EGLint      getWidth() const    {
      return width;
   }
   virtual     EGLint      getHeight() const   {
      return height;
   }
   virtual     EGLint      getHorizontalResolution() const;
   virtual     EGLint      getVerticalResolution() const;
   virtual     EGLint      getRefreshRate() const;
   virtual     EGLint      getSwapBehavior() const;
   virtual     EGLBoolean  setSwapRectangle(EGLint l, EGLint t, EGLint w, EGLint h);

private:
   status_t lock(android_native_buffer_t* buf, int usage, void** vaddr);
   status_t unlock(android_native_buffer_t* buf);
   ANativeWindow*   nativeWindow;
   android_native_buffer_t*   buffer;
   android_native_buffer_t*   previousBuffer;
   gralloc_module_t const*    module;
   copybit_device_t*          blitengine;
   int width;
   int height;
   void* bits;
   GGLFormat const* pixelFormatTable;

   struct Rect {
      inline Rect() { };
      inline Rect(int32_t w, int32_t h)
            : left(0), top(0), right(w), bottom(h) { }
      inline Rect(int32_t l, int32_t t, int32_t r, int32_t b)
            : left(l), top(t), right(r), bottom(b) { }
      Rect& andSelf(const Rect& r) {
         left   = max(left, r.left);
         top    = max(top, r.top);
         right  = min(right, r.right);
         bottom = min(bottom, r.bottom);
         return *this;
      }
      bool isEmpty() const {
         return (left>=right || top>=bottom);
      }
      void dump(char const* what) {
         LOGD("%s { %5d, %5d, w=%5d, h=%5d }",
              what, left, top, right-left, bottom-top);
      }

      int32_t left;
      int32_t top;
      int32_t right;
      int32_t bottom;
   };

   struct Region {
      inline Region() : count(0) { }
      typedef Rect const* const_iterator;
      const_iterator begin() const {
         return storage;
      }
      const_iterator end() const {
         return storage+count;
      }
      static Region subtract(const Rect& lhs, const Rect& rhs) {
         Region reg;
         Rect* storage = reg.storage;
         if (!lhs.isEmpty()) {
            if (lhs.top < rhs.top) { // top rect
               storage->left   = lhs.left;
               storage->top    = lhs.top;
               storage->right  = lhs.right;
               storage->bottom = rhs.top;
               storage++;
            }
            const int32_t top = max(lhs.top, rhs.top);
            const int32_t bot = min(lhs.bottom, rhs.bottom);
            if (top < bot) {
               if (lhs.left < rhs.left) { // left-side rect
                  storage->left   = lhs.left;
                  storage->top    = top;
                  storage->right  = rhs.left;
                  storage->bottom = bot;
                  storage++;
               }
               if (lhs.right > rhs.right) { // right-side rect
                  storage->left   = rhs.right;
                  storage->top    = top;
                  storage->right  = lhs.right;
                  storage->bottom = bot;
                  storage++;
               }
            }
            if (lhs.bottom > rhs.bottom) { // bottom rect
               storage->left   = lhs.left;
               storage->top    = rhs.bottom;
               storage->right  = lhs.right;
               storage->bottom = lhs.bottom;
               storage++;
            }
            reg.count = storage - reg.storage;
         }
         return reg;
      }
      bool isEmpty() const {
         return count<=0;
      }
private:
      Rect storage[4];
      ssize_t count;
   };

   struct region_iterator : public copybit_region_t {
      region_iterator(const Region& region)
            : b(region.begin()), e(region.end()) {
         this->next = iterate;
      }
private:
      static int iterate(copybit_region_t const * self, copybit_rect_t* rect) {
         region_iterator const* me = static_cast<region_iterator const*>(self);
         if (me->b != me->e) {
            *reinterpret_cast<Rect*>(rect) = *me->b++;
            return 1;
         }
         return 0;
      }
      mutable Region::const_iterator b;
      Region::const_iterator const e;
   };

   void copyBlt(
      android_native_buffer_t* dst, void* dst_vaddr,
      android_native_buffer_t* src, void const* src_vaddr,
      const Region& clip);

   Rect dirtyRegion;
   Rect oldDirtyRegion;
};

egl_window_surface_v2_t::egl_window_surface_v2_t(EGLDisplay dpy,
      EGLConfig config,
      int32_t depthFormat,
      ANativeWindow* window)
      : egl_surface_t(dpy, config, depthFormat),
      nativeWindow(window), buffer(0), previousBuffer(0), module(0),
      blitengine(0), bits(NULL)
{
   hw_module_t const* pModule;
   hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &pModule);
   module = reinterpret_cast<gralloc_module_t const*>(pModule);

   if (hw_get_module(COPYBIT_HARDWARE_MODULE_ID, &pModule) == 0) {
      copybit_open(pModule, &blitengine);
   }

   pixelFormatTable = gglGetPixelFormatTable();

   // keep a reference on the window
   nativeWindow->common.incRef(&nativeWindow->common);
   nativeWindow->query(nativeWindow, NATIVE_WINDOW_WIDTH, &width);
   nativeWindow->query(nativeWindow, NATIVE_WINDOW_HEIGHT, &height);
   int format = 0;
   nativeWindow->query(nativeWindow, NATIVE_WINDOW_FORMAT, &format);
   LOGD("agl2: egl_window_surface_v2_t format=0x%.4X", format);
//   assert(0);
}

egl_window_surface_v2_t::~egl_window_surface_v2_t()
{
   if (buffer) {
      buffer->common.decRef(&buffer->common);
   }
   if (previousBuffer) {
      previousBuffer->common.decRef(&previousBuffer->common);
   }
   nativeWindow->common.decRef(&nativeWindow->common);
   if (blitengine) {
      copybit_close(blitengine);
   }
}

EGLBoolean egl_window_surface_v2_t::connect()
{
   // we're intending to do software rendering
   native_window_set_usage(nativeWindow,
                           GRALLOC_USAGE_SW_READ_OFTEN | GRALLOC_USAGE_SW_WRITE_OFTEN);

   // dequeue a buffer
   if (nativeWindow->dequeueBuffer(nativeWindow, &buffer) != NO_ERROR) {
      return setError(EGL_BAD_ALLOC, EGL_FALSE);
   }

   // allocate a corresponding depth-buffer
   width = buffer->width;
   height = buffer->height;
   if (depth.format) {
      depth.width   = width;
      depth.height  = height;
      depth.stride  = depth.width; // use the width here
      assert(GGL_PIXEL_FORMAT_Z_32 == depth.format);
      depth.data    = (GGLubyte*)malloc(depth.stride*depth.height*4);
      if (depth.data == 0) {
         return setError(EGL_BAD_ALLOC, EGL_FALSE);
      }
   }

   // keep a reference on the buffer
   buffer->common.incRef(&buffer->common);

   // Lock the buffer
   nativeWindow->lockBuffer(nativeWindow, buffer);
   // pin the buffer down
   if (lock(buffer, GRALLOC_USAGE_SW_READ_OFTEN |
            GRALLOC_USAGE_SW_WRITE_OFTEN, &bits) != NO_ERROR) {
      LOGE("connect() failed to lock buffer %p (%ux%u)",
           buffer, buffer->width, buffer->height);
      return setError(EGL_BAD_ACCESS, EGL_FALSE);
      // FIXME: we should make sure we're not accessing the buffer anymore
   }
   return EGL_TRUE;
}

void egl_window_surface_v2_t::disconnect()
{
   if (buffer && bits) {
      bits = NULL;
      unlock(buffer);
   }
   // enqueue the last frame
   if (buffer)
      nativeWindow->queueBuffer(nativeWindow, buffer);
   if (buffer) {
      buffer->common.decRef(&buffer->common);
      buffer = 0;
   }
   if (previousBuffer) {
      previousBuffer->common.decRef(&previousBuffer->common);
      previousBuffer = 0;
   }
}

status_t egl_window_surface_v2_t::lock(
   android_native_buffer_t* buf, int usage, void** vaddr)
{
   int err;

   err = module->lock(module, buf->handle,
                      usage, 0, 0, buf->width, buf->height, vaddr);

   return err;
}

status_t egl_window_surface_v2_t::unlock(android_native_buffer_t* buf)
{
   if (!buf) return BAD_VALUE;
   int err = NO_ERROR;

   err = module->unlock(module, buf->handle);

   return err;
}

void egl_window_surface_v2_t::copyBlt(
   android_native_buffer_t* dst, void* dst_vaddr,
   android_native_buffer_t* src, void const* src_vaddr,
   const Region& clip)
{
   // FIXME: use copybit if possible
   // NOTE: dst and src must be the same format

   status_t err = NO_ERROR;
   copybit_device_t* const copybit = blitengine;
   if (copybit)  {
      copybit_image_t simg;
      simg.w = src->stride;
      simg.h = src->height;
      simg.format = src->format;
      simg.handle = const_cast<native_handle_t*>(src->handle);

      copybit_image_t dimg;
      dimg.w = dst->stride;
      dimg.h = dst->height;
      dimg.format = dst->format;
      dimg.handle = const_cast<native_handle_t*>(dst->handle);

      copybit->set_parameter(copybit, COPYBIT_TRANSFORM, 0);
      copybit->set_parameter(copybit, COPYBIT_PLANE_ALPHA, 255);
      copybit->set_parameter(copybit, COPYBIT_DITHER, COPYBIT_DISABLE);
      region_iterator it(clip);
      err = copybit->blit(copybit, &dimg, &simg, &it);
      if (err != NO_ERROR) {
         LOGE("copybit failed (%s)", strerror(err));
      }
   }

   if (!copybit || err) {
      Region::const_iterator cur = clip.begin();
      Region::const_iterator end = clip.end();

      const size_t bpp = pixelFormatTable[src->format].size;
      const size_t dbpr = dst->stride * bpp;
      const size_t sbpr = src->stride * bpp;

      uint8_t const * const src_bits = (uint8_t const *)src_vaddr;
      uint8_t       * const dst_bits = (uint8_t       *)dst_vaddr;

      while (cur != end) {
         const Rect& r(*cur++);
         ssize_t w = r.right - r.left;
         ssize_t h = r.bottom - r.top;
         if (w <= 0 || h<=0) continue;
         size_t size = w * bpp;
         uint8_t const * s = src_bits + (r.left + src->stride * r.top) * bpp;
         uint8_t       * d = dst_bits + (r.left + dst->stride * r.top) * bpp;
         if (dbpr==sbpr && size==sbpr) {
            size *= h;
            h = 1;
         }
         do {
            memcpy(d, s, size);
            d += dbpr;
            s += sbpr;
         } while (--h > 0);
      }
   }
}

EGLBoolean egl_window_surface_v2_t::swapBuffers()
{
   if (!buffer) {
      return setError(EGL_BAD_ACCESS, EGL_FALSE);
   }

   /*
    * Handle eglSetSwapRectangleANDROID()
    * We copyback from the front buffer
    */
   if (!dirtyRegion.isEmpty()) {
      dirtyRegion.andSelf(Rect(buffer->width, buffer->height));
      if (previousBuffer) {
         // This was const Region copyBack, but that causes an
         // internal compile error on simulator builds
         /*const*/
         Region copyBack(Region::subtract(oldDirtyRegion, dirtyRegion));
         if (!copyBack.isEmpty()) {
            void* prevBits;
            if (lock(previousBuffer,
                     GRALLOC_USAGE_SW_READ_OFTEN, &prevBits) == NO_ERROR) {
               // copy from previousBuffer to buffer
               copyBlt(buffer, bits, previousBuffer, prevBits, copyBack);
               unlock(previousBuffer);
            }
         }
      }
      oldDirtyRegion = dirtyRegion;
   }

   if (previousBuffer) {
      previousBuffer->common.decRef(&previousBuffer->common);
      previousBuffer = 0;
   }

   unlock(buffer);
   previousBuffer = buffer;
   nativeWindow->queueBuffer(nativeWindow, buffer);
   buffer = 0;

   // dequeue a new buffer
   if (nativeWindow->dequeueBuffer(nativeWindow, &buffer) == NO_ERROR) {

      // TODO: lockBuffer should rather be executed when the very first
      // direct rendering occurs.
      nativeWindow->lockBuffer(nativeWindow, buffer);

      // reallocate the depth-buffer if needed
      if ((width != buffer->width) || (height != buffer->height)) {
         // TODO: we probably should reset the swap rect here
         // if the window size has changed
         width = buffer->width;
         height = buffer->height;
         if (depth.data) {
            free(depth.data);
            depth.width   = width;
            depth.height  = height;
            depth.stride  = buffer->stride;
            depth.data    = (GGLubyte*)malloc(depth.stride*depth.height*2);
            if (depth.data == 0) {
               setError(EGL_BAD_ALLOC, EGL_FALSE);
               return EGL_FALSE;
            }
         }
      }

      // keep a reference on the buffer
      buffer->common.incRef(&buffer->common);

      // finally pin the buffer down
      if (lock(buffer, GRALLOC_USAGE_SW_READ_OFTEN |
               GRALLOC_USAGE_SW_WRITE_OFTEN, &bits) != NO_ERROR) {
         LOGE("eglSwapBuffers() failed to lock buffer %p (%ux%u)",
              buffer, buffer->width, buffer->height);
         return setError(EGL_BAD_ACCESS, EGL_FALSE);
         // FIXME: we should make sure we're not accessing the buffer anymore
      }
   } else {
      return setError(EGL_BAD_CURRENT_SURFACE, EGL_FALSE);
   }

   return EGL_TRUE;
}

EGLBoolean egl_window_surface_v2_t::setSwapRectangle(
   EGLint l, EGLint t, EGLint w, EGLint h)
{
   dirtyRegion = Rect(l, t, l+w, t+h);
   return EGL_TRUE;
}

EGLBoolean egl_window_surface_v2_t::bindDrawSurface(GLES2Context* gl)
{
   GGLSurface buffer;
   buffer.version = sizeof(GGLSurface);
   buffer.width   = this->buffer->width;
   buffer.height  = this->buffer->height;
   buffer.stride  = this->buffer->stride;
   buffer.data    = (GGLubyte*)bits;
   buffer.format  = (GGLPixelFormat)this->buffer->format;
   gl->rasterizer.interface.SetBuffer(&gl->rasterizer.interface, GL_COLOR_BUFFER_BIT, &buffer);
   if (depth.data != gl->rasterizer.depthSurface.data)
      gl->rasterizer.interface.SetBuffer(&gl->rasterizer.interface, GL_DEPTH_BUFFER_BIT, &depth);

   return EGL_TRUE;
}
EGLBoolean egl_window_surface_v2_t::bindReadSurface(GLES2Context* gl)
{
   GGLSurface buffer;
   buffer.version = sizeof(GGLSurface);
   buffer.width   = this->buffer->width;
   buffer.height  = this->buffer->height;
   buffer.stride  = this->buffer->stride;
   buffer.data    = (GGLubyte*)bits; // FIXME: hopefully is is LOCKED!!!
   buffer.format  = (GGLPixelFormat)this->buffer->format;
   puts("agl2: readBuffer not implemented");
   //gl->rasterizer.interface.readBuffer(gl, &buffer);
   return EGL_TRUE;
}
EGLint egl_window_surface_v2_t::getHorizontalResolution() const
{
   return (nativeWindow->xdpi * EGL_DISPLAY_SCALING) * (1.0f / 25.4f);
}
EGLint egl_window_surface_v2_t::getVerticalResolution() const
{
   return (nativeWindow->ydpi * EGL_DISPLAY_SCALING) * (1.0f / 25.4f);
}
EGLint egl_window_surface_v2_t::getRefreshRate() const
{
   return (60 * EGL_DISPLAY_SCALING); // FIXME
}
EGLint egl_window_surface_v2_t::getSwapBehavior() const
{
   /*
    * EGL_BUFFER_PRESERVED means that eglSwapBuffers() completely preserves
    * the content of the swapped buffer.
    *
    * EGL_BUFFER_DESTROYED means that the content of the buffer is lost.
    *
    * However when ANDROID_swap_retcangle is supported, EGL_BUFFER_DESTROYED
    * only applies to the area specified by eglSetSwapRectangleANDROID(), that
    * is, everything outside of this area is preserved.
    *
    * This implementation of EGL assumes the later case.
    *
    */

   return EGL_BUFFER_DESTROYED;
}

// ----------------------------------------------------------------------------

struct egl_pixmap_surface_t : public egl_surface_t {
   egl_pixmap_surface_t(
      EGLDisplay dpy, EGLConfig config,
      int32_t depthFormat,
      egl_native_pixmap_t const * pixmap);

   virtual ~egl_pixmap_surface_t() { }

   virtual     bool        initCheck() const {
      return !depth.format || depth.data!=0;
   }
   virtual     EGLBoolean  bindDrawSurface(GLES2Context* gl);
   virtual     EGLBoolean  bindReadSurface(GLES2Context* gl);
   virtual     EGLint      getWidth() const    {
      return nativePixmap.width;
   }
   virtual     EGLint      getHeight() const   {
      return nativePixmap.height;
   }
private:
   egl_native_pixmap_t     nativePixmap;
};

egl_pixmap_surface_t::egl_pixmap_surface_t(EGLDisplay dpy,
      EGLConfig config,
      int32_t depthFormat,
      egl_native_pixmap_t const * pixmap)
      : egl_surface_t(dpy, config, depthFormat), nativePixmap(*pixmap)
{
   if (depthFormat) {
      depth.width   = pixmap->width;
      depth.height  = pixmap->height;
      depth.stride  = depth.width; // use the width here
      depth.data    = (GGLubyte*)malloc(depth.stride*depth.height*2);
      if (depth.data == 0) {
         setError(EGL_BAD_ALLOC, EGL_NO_SURFACE);
      }
   }
}
EGLBoolean egl_pixmap_surface_t::bindDrawSurface(GLES2Context* gl)
{
   GGLSurface buffer;
   buffer.version = sizeof(GGLSurface);
   buffer.width   = nativePixmap.width;
   buffer.height  = nativePixmap.height;
   buffer.stride  = nativePixmap.stride;
   buffer.data    = nativePixmap.data;
   buffer.format  = (GGLPixelFormat)nativePixmap.format;

   gl->rasterizer.interface.SetBuffer(&gl->rasterizer.interface, GL_COLOR_BUFFER_BIT, &buffer);
   if (depth.data != gl->rasterizer.depthSurface.data)
      gl->rasterizer.interface.SetBuffer(&gl->rasterizer.interface, GL_DEPTH_BUFFER_BIT, &depth);
   return EGL_TRUE;
}
EGLBoolean egl_pixmap_surface_t::bindReadSurface(GLES2Context* gl)
{
   GGLSurface buffer;
   buffer.version = sizeof(GGLSurface);
   buffer.width   = nativePixmap.width;
   buffer.height  = nativePixmap.height;
   buffer.stride  = nativePixmap.stride;
   buffer.data    = nativePixmap.data;
   buffer.format  = (GGLPixelFormat)nativePixmap.format;
   puts("agl2: readBuffer not implemented");
   //gl->rasterizer.interface.readBuffer(gl, &buffer);
   return EGL_TRUE;
}

// ----------------------------------------------------------------------------

struct egl_pbuffer_surface_t : public egl_surface_t {
   egl_pbuffer_surface_t(
      EGLDisplay dpy, EGLConfig config, int32_t depthFormat,
      int32_t w, int32_t h, int32_t f);

   virtual ~egl_pbuffer_surface_t();

   virtual     bool        initCheck() const   {
      return pbuffer.data != 0;
   }
   virtual     EGLBoolean  bindDrawSurface(GLES2Context* gl);
   virtual     EGLBoolean  bindReadSurface(GLES2Context* gl);
   virtual     EGLint      getWidth() const    {
      return pbuffer.width;
   }
   virtual     EGLint      getHeight() const   {
      return pbuffer.height;
   }
private:
   GGLSurface  pbuffer;
};

egl_pbuffer_surface_t::egl_pbuffer_surface_t(EGLDisplay dpy,
      EGLConfig config, int32_t depthFormat,
      int32_t w, int32_t h, int32_t f)
      : egl_surface_t(dpy, config, depthFormat)
{
   size_t size = w*h;
   switch (f) {
   case GGL_PIXEL_FORMAT_A_8:
      size *= 1;
      break;
   case GGL_PIXEL_FORMAT_RGB_565:
      size *= 2;
      break;
   case GGL_PIXEL_FORMAT_RGBA_8888:
      size *= 4;
      break;
   case GGL_PIXEL_FORMAT_RGBX_8888:
      size *= 4;
      break;
   default:
      LOGE("incompatible pixel format for pbuffer (format=%d)", f);
      pbuffer.data = 0;
      break;
   }
   pbuffer.version = sizeof(GGLSurface);
   pbuffer.width   = w;
   pbuffer.height  = h;
   pbuffer.stride  = w;
   pbuffer.data    = (GGLubyte*)malloc(size);
   pbuffer.format  = (GGLPixelFormat)f;

   if (depthFormat) {
      depth.width   = pbuffer.width;
      depth.height  = pbuffer.height;
      depth.stride  = depth.width; // use the width here
      depth.data    = (GGLubyte*)malloc(depth.stride*depth.height*2);
      if (depth.data == 0) {
         setError(EGL_BAD_ALLOC, EGL_NO_SURFACE);
         return;
      }
   }
}
egl_pbuffer_surface_t::~egl_pbuffer_surface_t()
{
   free(pbuffer.data);
}
EGLBoolean egl_pbuffer_surface_t::bindDrawSurface(GLES2Context* gl)
{
   gl->rasterizer.interface.SetBuffer(&gl->rasterizer.interface, GL_COLOR_BUFFER_BIT, &pbuffer);
   if (depth.data != gl->rasterizer.depthSurface.data)
      gl->rasterizer.interface.SetBuffer(&gl->rasterizer.interface, GL_DEPTH_BUFFER_BIT, &depth);
   return EGL_TRUE;
}
EGLBoolean egl_pbuffer_surface_t::bindReadSurface(GLES2Context* gl)
{
   puts("agl2: readBuffer not implemented");
   //gl->rasterizer.interface.readBuffer(gl, &pbuffer);
   return EGL_TRUE;
}

// ----------------------------------------------------------------------------

struct config_pair_t {
   GLint key;
   GLint value;
};

struct configs_t {
   const config_pair_t* array;
   int                  size;
};

struct config_management_t {
   GLint key;
   bool (*match)(GLint reqValue, GLint confValue);
   static bool atLeast(GLint reqValue, GLint confValue) {
      return (reqValue == EGL_DONT_CARE) || (confValue >= reqValue);
   }
   static bool exact(GLint reqValue, GLint confValue) {
      return (reqValue == EGL_DONT_CARE) || (confValue == reqValue);
   }
   static bool mask(GLint reqValue, GLint confValue) {
      return (confValue & reqValue) == reqValue;
   }
   static bool ignore(GLint reqValue, GLint confValue) {
      return true;
   }
};

// ----------------------------------------------------------------------------

#define VERSION_MAJOR 1
#define VERSION_MINOR 2
static char const * const gVendorString     = "Google Inc.";
static char const * const gVersionString    = "0.0 Android Driver 0.0.0";
static char const * const gClientApiString  = "OpenGL ES2";
static char const * const gExtensionsString =
   //"EGL_KHR_image_base "
   // "KHR_image_pixmap "
   //"EGL_ANDROID_image_native_buffer "
   //"EGL_ANDROID_swap_rectangle "
   "";

// ----------------------------------------------------------------------------

struct extention_map_t {
   const char * const name;
   __eglMustCastToProperFunctionPointerType address;
};

static const extention_map_t gExtentionMap[] = {
//    { "glDrawTexsOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexsOES },
//    { "glDrawTexiOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexiOES },
//    { "glDrawTexfOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexfOES },
//    { "glDrawTexxOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexxOES },
//    { "glDrawTexsvOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexsvOES },
//    { "glDrawTexivOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexivOES },
//    { "glDrawTexfvOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexfvOES },
//    { "glDrawTexxvOES",
//            (__eglMustCastToProperFunctionPointerType)&glDrawTexxvOES },
//    { "glQueryMatrixxOES",
//            (__eglMustCastToProperFunctionPointerType)&glQueryMatrixxOES },
//    { "glEGLImageTargetTexture2DOES",
//            (__eglMustCastToProperFunctionPointerType)&glEGLImageTargetTexture2DOES },
//    { "glEGLImageTargetRenderbufferStorageOES",
//            (__eglMustCastToProperFunctionPointerType)&glEGLImageTargetRenderbufferStorageOES },
//    { "glClipPlanef",
//            (__eglMustCastToProperFunctionPointerType)&glClipPlanef },
//    { "glClipPlanex",
//            (__eglMustCastToProperFunctionPointerType)&glClipPlanex },
//    { "glBindBuffer",
//            (__eglMustCastToProperFunctionPointerType)&glBindBuffer },
//    { "glBufferData",
//            (__eglMustCastToProperFunctionPointerType)&glBufferData },
//    { "glBufferSubData",
//            (__eglMustCastToProperFunctionPointerType)&glBufferSubData },
//    { "glDeleteBuffers",
//            (__eglMustCastToProperFunctionPointerType)&glDeleteBuffers },
//    { "glGenBuffers",
//            (__eglMustCastToProperFunctionPointerType)&glGenBuffers },
//    { "eglCreateImageKHR",
//            (__eglMustCastToProperFunctionPointerType)&eglCreateImageKHR },
//    { "eglDestroyImageKHR",
//            (__eglMustCastToProperFunctionPointerType)&eglDestroyImageKHR },
//    { "eglSetSwapRectangleANDROID",
//            (__eglMustCastToProperFunctionPointerType)&eglSetSwapRectangleANDROID },
};

/*
 * In the lists below, attributes names MUST be sorted.
 * Additionally, all configs must be sorted according to
 * the EGL specification.
 */

static config_pair_t const config_base_attribute_list[] = {
   { EGL_STENCIL_SIZE,               0                                 },
   { EGL_CONFIG_CAVEAT,              EGL_SLOW_CONFIG                   },
   { EGL_LEVEL,                      0                                 },
   { EGL_MAX_PBUFFER_HEIGHT,         GGL_MAX_VIEWPORT_DIMS             },
   { EGL_MAX_PBUFFER_PIXELS,
     GGL_MAX_VIEWPORT_DIMS*GGL_MAX_VIEWPORT_DIMS                 },
   { EGL_MAX_PBUFFER_WIDTH,          GGL_MAX_VIEWPORT_DIMS             },
   { EGL_NATIVE_RENDERABLE,          EGL_TRUE                          },
   { EGL_NATIVE_VISUAL_ID,           0                                 },
   { EGL_NATIVE_VISUAL_TYPE,         GGL_PIXEL_FORMAT_RGBA_8888        },
   { EGL_SAMPLES,                    0                                 },
   { EGL_SAMPLE_BUFFERS,             0                                 },
   { EGL_TRANSPARENT_TYPE,           EGL_NONE                          },
   { EGL_TRANSPARENT_BLUE_VALUE,     0                                 },
   { EGL_TRANSPARENT_GREEN_VALUE,    0                                 },
   { EGL_TRANSPARENT_RED_VALUE,      0                                 },
   { EGL_BIND_TO_TEXTURE_RGBA,       EGL_FALSE                         },
   { EGL_BIND_TO_TEXTURE_RGB,        EGL_FALSE                         },
   { EGL_MIN_SWAP_INTERVAL,          1                                 },
   { EGL_MAX_SWAP_INTERVAL,          1                                 },
   { EGL_LUMINANCE_SIZE,             0                                 },
   { EGL_ALPHA_MASK_SIZE,            0                                 },
   { EGL_COLOR_BUFFER_TYPE,          EGL_RGB_BUFFER                    },
   { EGL_RENDERABLE_TYPE,            EGL_OPENGL_ES2_BIT                },
   { EGL_CONFORMANT,                 0                                 }
};

// These configs can override the base attribute list
// NOTE: when adding a config here, don't forget to update eglCreate*Surface()

// 565 configs
static config_pair_t const config_0_attribute_list[] = {
   { EGL_BUFFER_SIZE,     16 },
   { EGL_ALPHA_SIZE,       0 },
   { EGL_BLUE_SIZE,        5 },
   { EGL_GREEN_SIZE,       6 },
   { EGL_RED_SIZE,         5 },
   { EGL_DEPTH_SIZE,       0 },
   { EGL_CONFIG_ID,        0 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_RGB_565 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

static config_pair_t const config_1_attribute_list[] = {
   { EGL_BUFFER_SIZE,     16 },
   { EGL_ALPHA_SIZE,       0 },
   { EGL_BLUE_SIZE,        5 },
   { EGL_GREEN_SIZE,       6 },
   { EGL_RED_SIZE,         5 },
   { EGL_DEPTH_SIZE,      16 },
   { EGL_CONFIG_ID,        1 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_RGB_565 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

// RGB 888 configs
static config_pair_t const config_2_attribute_list[] = {
   { EGL_BUFFER_SIZE,     32 },
   { EGL_ALPHA_SIZE,       0 },
   { EGL_BLUE_SIZE,        8 },
   { EGL_GREEN_SIZE,       8 },
   { EGL_RED_SIZE,         8 },
   { EGL_DEPTH_SIZE,       0 },
   { EGL_CONFIG_ID,        6 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_RGBX_8888 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

static config_pair_t const config_3_attribute_list[] = {
   { EGL_BUFFER_SIZE,     32 },
   { EGL_ALPHA_SIZE,       0 },
   { EGL_BLUE_SIZE,        8 },
   { EGL_GREEN_SIZE,       8 },
   { EGL_RED_SIZE,         8 },
   { EGL_DEPTH_SIZE,      16 },
   { EGL_CONFIG_ID,        7 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_RGBX_8888 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

// 8888 configs
static config_pair_t const config_4_attribute_list[] = {
   { EGL_BUFFER_SIZE,     32 },
   { EGL_ALPHA_SIZE,       8 },
   { EGL_BLUE_SIZE,        8 },
   { EGL_GREEN_SIZE,       8 },
   { EGL_RED_SIZE,         8 },
   { EGL_DEPTH_SIZE,       0 },
   { EGL_CONFIG_ID,        2 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_RGBA_8888 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

static config_pair_t const config_5_attribute_list[] = {
   { EGL_BUFFER_SIZE,     32 },
   { EGL_ALPHA_SIZE,       8 },
   { EGL_BLUE_SIZE,        8 },
   { EGL_GREEN_SIZE,       8 },
   { EGL_RED_SIZE,         8 },
   { EGL_DEPTH_SIZE,      16 },
   { EGL_CONFIG_ID,        3 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_RGBA_8888 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

// A8 configs
static config_pair_t const config_6_attribute_list[] = {
   { EGL_BUFFER_SIZE,      8 },
   { EGL_ALPHA_SIZE,       8 },
   { EGL_BLUE_SIZE,        0 },
   { EGL_GREEN_SIZE,       0 },
   { EGL_RED_SIZE,         0 },
   { EGL_DEPTH_SIZE,       0 },
   { EGL_CONFIG_ID,        4 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_A_8 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

static config_pair_t const config_7_attribute_list[] = {
   { EGL_BUFFER_SIZE,      8 },
   { EGL_ALPHA_SIZE,       8 },
   { EGL_BLUE_SIZE,        0 },
   { EGL_GREEN_SIZE,       0 },
   { EGL_RED_SIZE,         0 },
   { EGL_DEPTH_SIZE,      16 },
   { EGL_CONFIG_ID,        5 },
   { EGL_NATIVE_VISUAL_ID, GGL_PIXEL_FORMAT_A_8 },
   { EGL_SURFACE_TYPE,     EGL_SWAP_BEHAVIOR_PRESERVED_BIT|EGL_WINDOW_BIT|EGL_PBUFFER_BIT|EGL_PIXMAP_BIT },
};

static configs_t const gConfigs[] = {
   { config_0_attribute_list, NELEM(config_0_attribute_list) },
   { config_1_attribute_list, NELEM(config_1_attribute_list) },
   { config_2_attribute_list, NELEM(config_2_attribute_list) },
   { config_3_attribute_list, NELEM(config_3_attribute_list) },
   { config_4_attribute_list, NELEM(config_4_attribute_list) },
   { config_5_attribute_list, NELEM(config_5_attribute_list) },
//   { config_6_attribute_list, NELEM(config_6_attribute_list) },
//   { config_7_attribute_list, NELEM(config_7_attribute_list) },
};

static config_management_t const gConfigManagement[] = {
   { EGL_BUFFER_SIZE,                config_management_t::atLeast },
   { EGL_ALPHA_SIZE,                 config_management_t::atLeast },
   { EGL_BLUE_SIZE,                  config_management_t::atLeast },
   { EGL_GREEN_SIZE,                 config_management_t::atLeast },
   { EGL_RED_SIZE,                   config_management_t::atLeast },
   { EGL_DEPTH_SIZE,                 config_management_t::atLeast },
   { EGL_STENCIL_SIZE,               config_management_t::atLeast },
   { EGL_CONFIG_CAVEAT,              config_management_t::exact   },
   { EGL_CONFIG_ID,                  config_management_t::exact   },
   { EGL_LEVEL,                      config_management_t::exact   },
   { EGL_MAX_PBUFFER_HEIGHT,         config_management_t::ignore   },
   { EGL_MAX_PBUFFER_PIXELS,         config_management_t::ignore   },
   { EGL_MAX_PBUFFER_WIDTH,          config_management_t::ignore   },
   { EGL_NATIVE_RENDERABLE,          config_management_t::exact   },
   { EGL_NATIVE_VISUAL_ID,           config_management_t::ignore   },
   { EGL_NATIVE_VISUAL_TYPE,         config_management_t::exact   },
   { EGL_SAMPLES,                    config_management_t::exact   },
   { EGL_SAMPLE_BUFFERS,             config_management_t::exact   },
   { EGL_SURFACE_TYPE,               config_management_t::mask    },
   { EGL_TRANSPARENT_TYPE,           config_management_t::exact   },
   { EGL_TRANSPARENT_BLUE_VALUE,     config_management_t::exact   },
   { EGL_TRANSPARENT_GREEN_VALUE,    config_management_t::exact   },
   { EGL_TRANSPARENT_RED_VALUE,      config_management_t::exact   },
   { EGL_BIND_TO_TEXTURE_RGBA,       config_management_t::exact   },
   { EGL_BIND_TO_TEXTURE_RGB,        config_management_t::exact   },
   { EGL_MIN_SWAP_INTERVAL,          config_management_t::exact   },
   { EGL_MAX_SWAP_INTERVAL,          config_management_t::exact   },
   { EGL_LUMINANCE_SIZE,             config_management_t::atLeast },
   { EGL_ALPHA_MASK_SIZE,            config_management_t::atLeast },
   { EGL_COLOR_BUFFER_TYPE,          config_management_t::exact   },
   { EGL_RENDERABLE_TYPE,            config_management_t::mask    },
   { EGL_CONFORMANT,                 config_management_t::mask    }
};


static config_pair_t const config_defaults[] = {
   // attributes that are not specified are simply ignored, if a particular
   // one needs not be ignored, it must be specified here, eg:
   // { EGL_SURFACE_TYPE, EGL_WINDOW_BIT },
};

// ----------------------------------------------------------------------------

static status_t getConfigFormatInfo(EGLint configID,
                                    int32_t& pixelFormat, int32_t& depthFormat)
{
   switch (configID) {
   case 0:
      pixelFormat = GGL_PIXEL_FORMAT_RGB_565;
      depthFormat = 0;
      break;
   case 1:
      pixelFormat = GGL_PIXEL_FORMAT_RGB_565;
      depthFormat = GGL_PIXEL_FORMAT_Z_32;
      break;
   case 2:
      pixelFormat = GGL_PIXEL_FORMAT_RGBA_8888;
      depthFormat = 0;
      break;
   case 3:
      pixelFormat = GGL_PIXEL_FORMAT_RGBA_8888;
      depthFormat = GGL_PIXEL_FORMAT_Z_32;
      break;
   case 4:
      pixelFormat = GGL_PIXEL_FORMAT_RGBA_8888;
      depthFormat = 0;
      break;
   case 5:
      pixelFormat = GGL_PIXEL_FORMAT_RGBA_8888;
      depthFormat = GGL_PIXEL_FORMAT_Z_32;
      break;
   case 6:
      pixelFormat = GGL_PIXEL_FORMAT_A_8;
      depthFormat = 0;
      break;
   case 7:
      pixelFormat = GGL_PIXEL_FORMAT_A_8;
      depthFormat = GGL_PIXEL_FORMAT_Z_32;
      break;
   default:
      return NAME_NOT_FOUND;
   }
   return NO_ERROR;
}

// ----------------------------------------------------------------------------

template<typename T>
static int binarySearch(T const sortedArray[], int first, int last, EGLint key)
{
   while (first <= last) {
      int mid = (first + last) / 2;
      if (key > sortedArray[mid].key) {
         first = mid + 1;
      } else if (key < sortedArray[mid].key) {
         last = mid - 1;
      } else {
         return mid;
      }
   }
   return -1;
}

static int isAttributeMatching(int i, EGLint attr, EGLint val)
{
   // look for the attribute in all of our configs
   config_pair_t const* configFound = gConfigs[i].array;
   int index = binarySearch<config_pair_t>(
                  gConfigs[i].array,
                  0, gConfigs[i].size-1,
                  attr);
   if (index < 0) {
      configFound = config_base_attribute_list;
      index = binarySearch<config_pair_t>(
                 config_base_attribute_list,
                 0, NELEM(config_base_attribute_list)-1,
                 attr);
   }
   if (index >= 0) {
      // attribute found, check if this config could match
      int cfgMgtIndex = binarySearch<config_management_t>(
                           gConfigManagement,
                           0, NELEM(gConfigManagement)-1,
                           attr);
      if (cfgMgtIndex >= 0) {
         bool match = gConfigManagement[cfgMgtIndex].match(
                         val, configFound[index].value);
         if (match) {
            // this config matches
            return 1;
         }
      } else {
         // attribute not found. this should NEVER happen.
      }
   } else {
      // error, this attribute doesn't exist
   }
   return 0;
}

static int makeCurrent(GLES2Context* gl)
{
   GLES2Context* current = (GLES2Context*)getGlThreadSpecific();
   if (gl) {
      egl_context_t* c = egl_context_t::context(gl);
      if (c->flags & egl_context_t::IS_CURRENT) {
         if (current != gl) {
            // it is an error to set a context current, if it's already
            // current to another thread
            return -1;
         }
      } else {
         if (current) {
            // mark the current context as not current, and flush
            glFlush();
            egl_context_t::context(current)->flags &= ~egl_context_t::IS_CURRENT;
         }
      }
      if (!(c->flags & egl_context_t::IS_CURRENT)) {
         // The context is not current, make it current!
         setGlThreadSpecific(gl);
         c->flags |= egl_context_t::IS_CURRENT;
      }
   } else {
      if (current) {
         // mark the current context as not current, and flush
         glFlush();
         egl_context_t::context(current)->flags &= ~egl_context_t::IS_CURRENT;
      }
      // this thread has no context attached to it
      setGlThreadSpecific(0);
   }
   return 0;
}

static EGLBoolean getConfigAttrib(EGLDisplay dpy, EGLConfig config,
                                  EGLint attribute, EGLint *value)
{
   size_t numConfigs =  NELEM(gConfigs);
   int index = (int)config;
   if (uint32_t(index) >= numConfigs)
      return setError(EGL_BAD_CONFIG, EGL_FALSE);

   int attrIndex;
   attrIndex = binarySearch<config_pair_t>(
                  gConfigs[index].array,
                  0, gConfigs[index].size-1,
                  attribute);
   if (attrIndex>=0) {
      *value = gConfigs[index].array[attrIndex].value;
      return EGL_TRUE;
   }

   attrIndex = binarySearch<config_pair_t>(
                  config_base_attribute_list,
                  0, NELEM(config_base_attribute_list)-1,
                  attribute);
   if (attrIndex>=0) {
      *value = config_base_attribute_list[attrIndex].value;
      return EGL_TRUE;
   }
   return setError(EGL_BAD_ATTRIBUTE, EGL_FALSE);
}

static EGLSurface createWindowSurface(EGLDisplay dpy, EGLConfig config,
                                      NativeWindowType window, const EGLint *attrib_list)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_NO_SURFACE);
   if (window == 0)
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   EGLint surfaceType;
   if (getConfigAttrib(dpy, config, EGL_SURFACE_TYPE, &surfaceType) == EGL_FALSE)
      return EGL_FALSE;

   if (!(surfaceType & EGL_WINDOW_BIT))
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   if (reinterpret_cast<ANativeWindow*>(window)->common.magic !=
         ANDROID_NATIVE_WINDOW_MAGIC) {
      return setError(EGL_BAD_NATIVE_WINDOW, EGL_NO_SURFACE);
   }

   EGLint configID;
   if (getConfigAttrib(dpy, config, EGL_CONFIG_ID, &configID) == EGL_FALSE)
      return EGL_FALSE;

   int32_t depthFormat;
   int32_t pixelFormat;
   if (getConfigFormatInfo(configID, pixelFormat, depthFormat) != NO_ERROR) {
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);
   }

   // FIXME: we don't have access to the pixelFormat here just yet.
   // (it's possible that the surface is not fully initialized)
   // maybe this should be done after the page-flip
   //if (EGLint(info.format) != pixelFormat)
   //    return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   egl_surface_t* surface;
   surface = new egl_window_surface_v2_t(dpy, config, depthFormat,
                                         reinterpret_cast<ANativeWindow*>(window));

   if (!surface->initCheck()) {
      // there was a problem in the ctor, the error
      // flag has been set.
      delete surface;
      surface = 0;
   }
   return surface;
}

static EGLSurface createPixmapSurface(EGLDisplay dpy, EGLConfig config,
                                      NativePixmapType pixmap, const EGLint *attrib_list)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_NO_SURFACE);
   if (pixmap == 0)
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   EGLint surfaceType;
   if (getConfigAttrib(dpy, config, EGL_SURFACE_TYPE, &surfaceType) == EGL_FALSE)
      return EGL_FALSE;

   if (!(surfaceType & EGL_PIXMAP_BIT))
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   if (reinterpret_cast<egl_native_pixmap_t*>(pixmap)->version !=
         sizeof(egl_native_pixmap_t)) {
      return setError(EGL_BAD_NATIVE_PIXMAP, EGL_NO_SURFACE);
   }

   EGLint configID;
   if (getConfigAttrib(dpy, config, EGL_CONFIG_ID, &configID) == EGL_FALSE)
      return EGL_FALSE;

   int32_t depthFormat;
   int32_t pixelFormat;
   if (getConfigFormatInfo(configID, pixelFormat, depthFormat) != NO_ERROR) {
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);
   }

   if (reinterpret_cast<egl_native_pixmap_t *>(pixmap)->format != pixelFormat)
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   egl_surface_t* surface =
      new egl_pixmap_surface_t(dpy, config, depthFormat,
                               reinterpret_cast<egl_native_pixmap_t*>(pixmap));

   if (!surface->initCheck()) {
      // there was a problem in the ctor, the error
      // flag has been set.
      delete surface;
      surface = 0;
   }
   return surface;
}

static EGLSurface createPbufferSurface(EGLDisplay dpy, EGLConfig config,
                                       const EGLint *attrib_list)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_NO_SURFACE);

   EGLint surfaceType;
   if (getConfigAttrib(dpy, config, EGL_SURFACE_TYPE, &surfaceType) == EGL_FALSE)
      return EGL_FALSE;

   if (!(surfaceType & EGL_PBUFFER_BIT))
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);

   EGLint configID;
   if (getConfigAttrib(dpy, config, EGL_CONFIG_ID, &configID) == EGL_FALSE)
      return EGL_FALSE;

   int32_t depthFormat;
   int32_t pixelFormat;
   if (getConfigFormatInfo(configID, pixelFormat, depthFormat) != NO_ERROR) {
      return setError(EGL_BAD_MATCH, EGL_NO_SURFACE);
   }

   int32_t w = 0;
   int32_t h = 0;
   while (attrib_list[0]) {
      if (attrib_list[0] == EGL_WIDTH)  w = attrib_list[1];
      if (attrib_list[0] == EGL_HEIGHT) h = attrib_list[1];
      attrib_list+=2;
   }

   egl_surface_t* surface =
      new egl_pbuffer_surface_t(dpy, config, depthFormat, w, h, pixelFormat);

   if (!surface->initCheck()) {
      // there was a problem in the ctor, the error
      // flag has been set.
      delete surface;
      surface = 0;
   }
   return surface;
}

// ----------------------------------------------------------------------------
}; // namespace android
// ----------------------------------------------------------------------------

using namespace android;

// ----------------------------------------------------------------------------
// Initialization
// ----------------------------------------------------------------------------

EGLDisplay eglGetDisplay(NativeDisplayType display)
{
   puts("agl2:eglGetDisplay");
#ifndef HAVE_ANDROID_OS
   // this just needs to be done once
   if (gGLKey == -1) {
      pthread_mutex_lock(&gInitMutex);
      if (gGLKey == -1)
         pthread_key_create(&gGLKey, NULL);
      pthread_mutex_unlock(&gInitMutex);
   }
#endif
   if (display == EGL_DEFAULT_DISPLAY) {
      EGLDisplay dpy = (EGLDisplay)1;
      egl_display_t& d = egl_display_t::get_display(dpy);
      d.type = display;
      return dpy;
   }
   return EGL_NO_DISPLAY;
}

EGLBoolean eglInitialize(EGLDisplay dpy, EGLint *major, EGLint *minor)
{
   puts("agl2:eglInitialize");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   EGLBoolean res = EGL_TRUE;
   egl_display_t& d = egl_display_t::get_display(dpy);

   if (android_atomic_inc(&d.initialized) == 0) {
      // initialize stuff here if needed
      //pthread_mutex_lock(&gInitMutex);
      //pthread_mutex_unlock(&gInitMutex);
   }

   if (res == EGL_TRUE) {
      if (major != NULL) *major = VERSION_MAJOR;
      if (minor != NULL) *minor = VERSION_MINOR;
   }
   return res;
}

EGLBoolean eglTerminate(EGLDisplay dpy)
{
   puts("agl2:eglTerminate");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   EGLBoolean res = EGL_TRUE;
   egl_display_t& d = egl_display_t::get_display(dpy);
   if (android_atomic_dec(&d.initialized) == 1) {
      // TODO: destroy all resources (surfaces, contexts, etc...)
      //pthread_mutex_lock(&gInitMutex);
      //pthread_mutex_unlock(&gInitMutex);
   }
   return res;
}

// ----------------------------------------------------------------------------
// configuration
// ----------------------------------------------------------------------------

EGLBoolean eglGetConfigs(   EGLDisplay dpy,
                            EGLConfig *configs,
                            EGLint config_size, EGLint *num_config)
{
   puts("agl2:eglGetConfigs");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   GLint numConfigs = NELEM(gConfigs);
   if (!configs) {
      *num_config = numConfigs;
      return EGL_TRUE;
   }
   GLint i;
   for (i=0 ; i<numConfigs && i<config_size ; i++) {
      *configs++ = (EGLConfig)i;
   }
   *num_config = i;
   return EGL_TRUE;
}

static const char * ATTRIBUTE_NAMES [] = {
   "EGL_BUFFER_SIZE",
   "EGL_ALPHA_SIZE",
   "EGL_BLUE_SIZE",
   "EGL_GREEN_SIZE",
   "EGL_RED_SIZE",
   "EGL_DEPTH_SIZE",
   "EGL_STENCIL_SIZE",
   "EGL_CONFIG_CAVEAT",
   "EGL_CONFIG_ID",
   "EGL_LEVEL",
   "EGL_MAX_PBUFFER_HEIGHT",
   "EGL_MAX_PBUFFER_PIXELS",
   "EGL_MAX_PBUFFER_WIDTH",
   "EGL_NATIVE_RENDERABLE",
   "EGL_NATIVE_VISUAL_ID",
   "EGL_NATIVE_VISUAL_TYPE",
   "EGL_PRESERVED_RESOURCES",
   "EGL_SAMPLES",
   "EGL_SAMPLE_BUFFERS",
   "EGL_SURFACE_TYPE",
   "EGL_TRANSPARENT_TYPE",
   "EGL_TRANSPARENT_BLUE_VALUE",
   "EGL_TRANSPARENT_GREEN_VALUE",
   "EGL_TRANSPARENT_RED_VALUE",
   "EGL_NONE",   /* Attrib list terminator */
   "EGL_BIND_TO_TEXTURE_RGB",
   "EGL_BIND_TO_TEXTURE_RGBA",
   "EGL_MIN_SWAP_INTERVAL",
   "EGL_MAX_SWAP_INTERVAL",
   "EGL_LUMINANCE_SIZE",
   "EGL_ALPHA_MASK_SIZE",
   "EGL_COLOR_BUFFER_TYPE",
   "EGL_RENDERABLE_TYPE",
   "EGL_MATCH_NATIVE_PIXMAP",   /* Pseudo-attribute (not queryable) */
   "EGL_CONFORMANT",
};

EGLBoolean eglChooseConfig( EGLDisplay dpy, const EGLint *attrib_list,
                            EGLConfig *configs, EGLint config_size,
                            EGLint *num_config)
{
   puts("agl2:eglChooseConfig");
   LOGD("\n***\n***\n agl2:LOGD eglChooseConfig \n***\n***\n");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   if (ggl_unlikely(num_config==0)) {
      LOGD("\n***\n***\n num_config==0 \n***\n***\n");
      return setError(EGL_BAD_PARAMETER, EGL_FALSE);
   }

   if (ggl_unlikely(attrib_list==0)) {
      /*
       * A NULL attrib_list should be treated as though it was an empty
       * one (terminated with EGL_NONE) as defined in
       * section 3.4.1 "Querying Configurations" in the EGL specification.
       */
      LOGD("\n***\n***\n attrib_list==0 \n***\n***\n");
      static const EGLint dummy = EGL_NONE;
      attrib_list = &dummy;
   }

   for (const EGLint * attrib = attrib_list; *attrib != EGL_NONE; attrib += 2) {
      LOGD("eglChooseConfig %s(%.4X): %d \n", ATTRIBUTE_NAMES[attrib[0] - EGL_BUFFER_SIZE], attrib[0], attrib[1]);
      if (EGL_BUFFER_SIZE > attrib[0] || EGL_CONFORMANT < attrib[0])
         LOGD("eglChooseConfig invalid config attrib: 0x%.4X=%d \n", attrib[0], attrib[1]);
   }

   int numAttributes = 0;
   int numConfigs =  NELEM(gConfigs);
   uint32_t possibleMatch = (1<<numConfigs)-1;
   while (possibleMatch && *attrib_list != EGL_NONE) {
      numAttributes++;
      EGLint attr = *attrib_list++;
      EGLint val  = *attrib_list++;
      for (int i=0 ; possibleMatch && i<numConfigs ; i++) {
         if (!(possibleMatch & (1<<i)))
            continue;
         if (isAttributeMatching(i, attr, val) == 0) {
            LOGD("!isAttributeMatching config(%d) %s=%d \n", i, ATTRIBUTE_NAMES[attr - EGL_BUFFER_SIZE], val);
            possibleMatch &= ~(1<<i);
         }
      }
   }

   LOGD("eglChooseConfig possibleMatch=%.4X \n", possibleMatch);

   // now, handle the attributes which have a useful default value
   for (size_t j=0 ; possibleMatch && j<NELEM(config_defaults) ; j++) {
      // see if this attribute was specified, if not, apply its
      // default value
      if (binarySearch<config_pair_t>(
               (config_pair_t const*)attrib_list,
               0, numAttributes-1,
               config_defaults[j].key) < 0) {
         for (int i=0 ; possibleMatch && i<numConfigs ; i++) {
            if (!(possibleMatch & (1<<i)))
               continue;
            if (isAttributeMatching(i,
                                    config_defaults[j].key,
                                    config_defaults[j].value) == 0) {
               possibleMatch &= ~(1<<i);
            }
         }
      }
   }

   // return the configurations found
   int n=0;
   if (possibleMatch) {
      if (configs) {
         for (int i=0 ; config_size && i<numConfigs ; i++) {
            if (possibleMatch & (1<<i)) {
               *configs++ = (EGLConfig)i;
               config_size--;
               n++;
            }
         }
      } else {
         for (int i=0 ; i<numConfigs ; i++) {
            if (possibleMatch & (1<<i)) {
               n++;
            }
         }
      }
   }
   *num_config = n;
   LOGD("\n***\n***\n num_config==%d \n***\n***\n", *num_config);
   return EGL_TRUE;
}

EGLBoolean eglGetConfigAttrib(EGLDisplay dpy, EGLConfig config,
                              EGLint attribute, EGLint *value)
{
   puts("agl2:eglGetConfigAttrib");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   return getConfigAttrib(dpy, config, attribute, value);
}

// ----------------------------------------------------------------------------
// surfaces
// ----------------------------------------------------------------------------

EGLSurface eglCreateWindowSurface(  EGLDisplay dpy, EGLConfig config,
                                    NativeWindowType window,
                                    const EGLint *attrib_list)
{
   puts("agl2:eglCreateWindowSurface");
   return createWindowSurface(dpy, config, window, attrib_list);
}

EGLSurface eglCreatePixmapSurface(  EGLDisplay dpy, EGLConfig config,
                                    NativePixmapType pixmap,
                                    const EGLint *attrib_list)
{
   puts("agl2:eglCreatePixmapSurface");
   return createPixmapSurface(dpy, config, pixmap, attrib_list);
}

EGLSurface eglCreatePbufferSurface( EGLDisplay dpy, EGLConfig config,
                                    const EGLint *attrib_list)
{
   puts("agl2:eglCreatePbufferSurface");
   return createPbufferSurface(dpy, config, attrib_list);
}

EGLBoolean eglDestroySurface(EGLDisplay dpy, EGLSurface eglSurface)
{
   puts("agl2:eglDestroySurface");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   if (eglSurface != EGL_NO_SURFACE) {
      egl_surface_t* surface( static_cast<egl_surface_t*>(eglSurface) );
      if (!surface->isValid())
         return setError(EGL_BAD_SURFACE, EGL_FALSE);
      if (surface->dpy != dpy)
         return setError(EGL_BAD_DISPLAY, EGL_FALSE);
      if (surface->ctx) {
         // FIXME: this surface is current check what the spec says
         surface->disconnect();
         surface->ctx = 0;
      }
      delete surface;
   }
   return EGL_TRUE;
}

EGLBoolean eglQuerySurface( EGLDisplay dpy, EGLSurface eglSurface,
                            EGLint attribute, EGLint *value)
{
   puts("agl2:eglQuerySurface");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   egl_surface_t* surface = static_cast<egl_surface_t*>(eglSurface);
   if (!surface->isValid())
      return setError(EGL_BAD_SURFACE, EGL_FALSE);
   if (surface->dpy != dpy)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   EGLBoolean ret = EGL_TRUE;
   switch (attribute) {
   case EGL_CONFIG_ID:
      ret = getConfigAttrib(dpy, surface->config, EGL_CONFIG_ID, value);
      break;
   case EGL_WIDTH:
      *value = surface->getWidth();
      break;
   case EGL_HEIGHT:
      *value = surface->getHeight();
      break;
   case EGL_LARGEST_PBUFFER:
      // not modified for a window or pixmap surface
      break;
   case EGL_TEXTURE_FORMAT:
      *value = EGL_NO_TEXTURE;
      break;
   case EGL_TEXTURE_TARGET:
      *value = EGL_NO_TEXTURE;
      break;
   case EGL_MIPMAP_TEXTURE:
      *value = EGL_FALSE;
      break;
   case EGL_MIPMAP_LEVEL:
      *value = 0;
      break;
   case EGL_RENDER_BUFFER:
      // TODO: return the real RENDER_BUFFER here
      *value = EGL_BACK_BUFFER;
      break;
   case EGL_HORIZONTAL_RESOLUTION:
      // pixel/mm * EGL_DISPLAY_SCALING
      *value = surface->getHorizontalResolution();
      break;
   case EGL_VERTICAL_RESOLUTION:
      // pixel/mm * EGL_DISPLAY_SCALING
      *value = surface->getVerticalResolution();
      break;
   case EGL_PIXEL_ASPECT_RATIO: {
      // w/h * EGL_DISPLAY_SCALING
      int wr = surface->getHorizontalResolution();
      int hr = surface->getVerticalResolution();
      *value = (wr * EGL_DISPLAY_SCALING) / hr;
   }
   break;
   case EGL_SWAP_BEHAVIOR:
      *value = surface->getSwapBehavior();
      break;
   default:
      ret = setError(EGL_BAD_ATTRIBUTE, EGL_FALSE);
   }
   return ret;
}

EGLContext eglCreateContext(EGLDisplay dpy, EGLConfig config,
                            EGLContext share_list, const EGLint *attrib_list)
{
   puts("agl2:eglCreateContext");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_NO_SURFACE);

   GLES2Context* gl = new GLES2Context();//ogles_init(sizeof(egl_context_t));
   if (!gl) return setError(EGL_BAD_ALLOC, EGL_NO_CONTEXT);

   //egl_context_t* c = static_cast<egl_context_t*>(gl->rasterizer.base);
   egl_context_t * c = &gl->egl;
   c->flags = egl_context_t::NEVER_CURRENT;
   c->dpy = dpy;
   c->config = config;
   c->read = 0;
   c->draw = 0;
   
   c->frame = 0;
   c->lastSwapTime = clock();
   c->accumulateSeconds = 0;
   return (EGLContext)gl;
}

EGLBoolean eglDestroyContext(EGLDisplay dpy, EGLContext ctx)
{
   puts("agl2:eglDestroyContext");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   egl_context_t* c = egl_context_t::context(ctx);
   if (c->flags & egl_context_t::IS_CURRENT)
      setGlThreadSpecific(0);
   //ogles_uninit((GLES2Context*)ctx);
   delete (GLES2Context*)ctx;
   return EGL_TRUE;
}

EGLBoolean eglMakeCurrent(  EGLDisplay dpy, EGLSurface draw,
                            EGLSurface read, EGLContext ctx)
{
   puts("agl2:eglMakeCurrent");
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   if (draw) {
      egl_surface_t* s = (egl_surface_t*)draw;
      if (!s->isValid())
         return setError(EGL_BAD_SURFACE, EGL_FALSE);
      if (s->dpy != dpy)
         return setError(EGL_BAD_DISPLAY, EGL_FALSE);
      // TODO: check that draw is compatible with the context
   }
   if (read && read!=draw) {
      egl_surface_t* s = (egl_surface_t*)read;
      if (!s->isValid())
         return setError(EGL_BAD_SURFACE, EGL_FALSE);
      if (s->dpy != dpy)
         return setError(EGL_BAD_DISPLAY, EGL_FALSE);
      // TODO: check that read is compatible with the context
   }

   EGLContext current_ctx = EGL_NO_CONTEXT;

   if ((read == EGL_NO_SURFACE && draw == EGL_NO_SURFACE) && (ctx != EGL_NO_CONTEXT))
      return setError(EGL_BAD_MATCH, EGL_FALSE);

   if ((read != EGL_NO_SURFACE || draw != EGL_NO_SURFACE) && (ctx == EGL_NO_CONTEXT))
      return setError(EGL_BAD_MATCH, EGL_FALSE);

   if (ctx == EGL_NO_CONTEXT) {
      // if we're detaching, we need the current context
      current_ctx = (EGLContext)getGlThreadSpecific();
   } else {
      egl_context_t* c = egl_context_t::context(ctx);
      egl_surface_t* d = (egl_surface_t*)draw;
      egl_surface_t* r = (egl_surface_t*)read;
      if ((d && d->ctx && d->ctx != ctx) ||
            (r && r->ctx && r->ctx != ctx)) {
         // one of the surface is bound to a context in another thread
         return setError(EGL_BAD_ACCESS, EGL_FALSE);
      }
   }

   GLES2Context* gl = (GLES2Context*)ctx;
   if (makeCurrent(gl) == 0) {
      if (ctx) {
         egl_context_t* c = egl_context_t::context(ctx);
         egl_surface_t* d = (egl_surface_t*)draw;
         egl_surface_t* r = (egl_surface_t*)read;

         if (c->draw) {
            egl_surface_t* s = reinterpret_cast<egl_surface_t*>(c->draw);
            s->disconnect();
         }
         if (c->read) {
            // FIXME: unlock/disconnect the read surface too
         }

         c->draw = draw;
         c->read = read;

         if (c->flags & egl_context_t::NEVER_CURRENT) {
            c->flags &= ~egl_context_t::NEVER_CURRENT;
            GLint w = 0;
            GLint h = 0;
            if (draw) {
               w = d->getWidth();
               h = d->getHeight();
            }
            gl->rasterizer.interface.Viewport(&gl->rasterizer.interface, 0, 0, w, h);
            //ogles_surfaceport(gl, 0, 0);
            //ogles_viewport(gl, 0, 0, w, h);
            //ogles_scissor(gl, 0, 0, w, h);
         }
         if (d) {
            if (d->connect() == EGL_FALSE) {
               return EGL_FALSE;
            }
            d->ctx = ctx;
            d->bindDrawSurface(gl);
         }
         if (r) {
            // FIXME: lock/connect the read surface too
            r->ctx = ctx;
            r->bindReadSurface(gl);
         }
      } else {
         // if surfaces were bound to the context bound to this thread
         // mark then as unbound.
         if (current_ctx) {
            egl_context_t* c = egl_context_t::context(current_ctx);
            egl_surface_t* d = (egl_surface_t*)c->draw;
            egl_surface_t* r = (egl_surface_t*)c->read;
            if (d) {
               c->draw = 0;
               d->ctx = EGL_NO_CONTEXT;
               d->disconnect();
            }
            if (r) {
               c->read = 0;
               r->ctx = EGL_NO_CONTEXT;
               // FIXME: unlock/disconnect the read surface too
            }
         }
      }
      return EGL_TRUE;
   }
   return setError(EGL_BAD_ACCESS, EGL_FALSE);
}

EGLContext eglGetCurrentContext(void)
{
   // eglGetCurrentContext returns the current EGL rendering context,
   // as specified by eglMakeCurrent. If no context is current,
   // EGL_NO_CONTEXT is returned.
   return (EGLContext)getGlThreadSpecific();
}

EGLSurface eglGetCurrentSurface(EGLint readdraw)
{
   // eglGetCurrentSurface returns the read or draw surface attached
   // to the current EGL rendering context, as specified by eglMakeCurrent.
   // If no context is current, EGL_NO_SURFACE is returned.
   EGLContext ctx = (EGLContext)getGlThreadSpecific();
   if (ctx == EGL_NO_CONTEXT) return EGL_NO_SURFACE;
   egl_context_t* c = egl_context_t::context(ctx);
   if (readdraw == EGL_READ) {
      return c->read;
   } else if (readdraw == EGL_DRAW) {
      return c->draw;
   }
   return setError(EGL_BAD_ATTRIBUTE, EGL_NO_SURFACE);
}

EGLDisplay eglGetCurrentDisplay(void)
{
   // eglGetCurrentDisplay returns the current EGL display connection
   // for the current EGL rendering context, as specified by eglMakeCurrent.
   // If no context is current, EGL_NO_DISPLAY is returned.
   EGLContext ctx = (EGLContext)getGlThreadSpecific();
   if (ctx == EGL_NO_CONTEXT) return EGL_NO_DISPLAY;
   egl_context_t* c = egl_context_t::context(ctx);
   return c->dpy;
}

EGLBoolean eglQueryContext( EGLDisplay dpy, EGLContext ctx,
                            EGLint attribute, EGLint *value)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   egl_context_t* c = egl_context_t::context(ctx);
   switch (attribute) {
   case EGL_CONFIG_ID:
      // Returns the ID of the EGL frame buffer configuration with
      // respect to which the context was created
      return getConfigAttrib(dpy, c->config, EGL_CONFIG_ID, value);
   }
   return setError(EGL_BAD_ATTRIBUTE, EGL_FALSE);
}

EGLBoolean eglWaitGL(void)
{
   return EGL_TRUE;
}

EGLBoolean eglWaitNative(EGLint engine)
{
   return EGL_TRUE;
}

EGLBoolean eglSwapBuffers(EGLDisplay dpy, EGLSurface draw)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   egl_surface_t* d = static_cast<egl_surface_t*>(draw);
   if (!d->isValid())
      return setError(EGL_BAD_SURFACE, EGL_FALSE);
   if (d->dpy != dpy)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   // post the surface
   d->swapBuffers();

   // if it's bound to a context, update the buffer
   if (d->ctx != EGL_NO_CONTEXT) {
      d->bindDrawSurface((GLES2Context*)d->ctx);
      // if this surface is also the read surface of the context
      // it is bound to, make sure to update the read buffer as well.
      // The EGL spec is a little unclear about this.
      egl_context_t* c = egl_context_t::context(d->ctx);
      if (c->read == draw) {
         d->bindReadSurface((GLES2Context*)d->ctx);
      }
      clock_t time = clock();
      float elapsed = (float)(time - c->lastSwapTime) / CLOCKS_PER_SEC;
      c->accumulateSeconds += elapsed;
      c->frame++;
//      LOGD("agl2: eglSwapBuffers elapsed=%.2fms \n*", elapsed * 1000);
      if (20 == c->frame) {
         float avg = c->accumulateSeconds / c->frame;
         LOGD("\n*\n* agl2: eglSwapBuffers %u frame avg fps=%.1f elapsed=%.2fms \n*",
              c->frame, 1 / avg, avg * 1000);
         c->frame = 0;
         c->accumulateSeconds = 0;
      }
      c->lastSwapTime = time;
   }

   return EGL_TRUE;
}

EGLBoolean eglCopyBuffers(  EGLDisplay dpy, EGLSurface surface,
                            NativePixmapType target)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   // TODO: eglCopyBuffers()
   return EGL_FALSE;
}

EGLint eglGetError(void)
{
   return getError();
}

const char* eglQueryString(EGLDisplay dpy, EGLint name)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, (const char*)0);

   switch (name) {
   case EGL_VENDOR:
      return gVendorString;
   case EGL_VERSION:
      return gVersionString;
   case EGL_EXTENSIONS:
      return gExtensionsString;
   case EGL_CLIENT_APIS:
      return gClientApiString;
   }
   return setError(EGL_BAD_PARAMETER, (const char *)0);
}

// ----------------------------------------------------------------------------
// EGL 1.1
// ----------------------------------------------------------------------------

EGLBoolean eglSurfaceAttrib(
   EGLDisplay dpy, EGLSurface surface, EGLint attribute, EGLint value)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   // TODO: eglSurfaceAttrib()
   return setError(EGL_BAD_PARAMETER, EGL_FALSE);
}

EGLBoolean eglBindTexImage(
   EGLDisplay dpy, EGLSurface surface, EGLint buffer)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   // TODO: eglBindTexImage()
   return setError(EGL_BAD_PARAMETER, EGL_FALSE);
}

EGLBoolean eglReleaseTexImage(
   EGLDisplay dpy, EGLSurface surface, EGLint buffer)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   // TODO: eglReleaseTexImage()
   return setError(EGL_BAD_PARAMETER, EGL_FALSE);
}

EGLBoolean eglSwapInterval(EGLDisplay dpy, EGLint interval)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   // TODO: eglSwapInterval()
   return EGL_TRUE;
}

// ----------------------------------------------------------------------------
// EGL 1.2
// ----------------------------------------------------------------------------

EGLBoolean eglBindAPI(EGLenum api)
{
   if (api != EGL_OPENGL_ES_API)
      return setError(EGL_BAD_PARAMETER, EGL_FALSE);
   return EGL_TRUE;
}

EGLenum eglQueryAPI(void)
{
   return EGL_OPENGL_ES_API;
}

EGLBoolean eglWaitClient(void)
{
   glFinish();
   return EGL_TRUE;
}

EGLBoolean eglReleaseThread(void)
{
   // TODO: eglReleaseThread()
   return EGL_TRUE;
}

EGLSurface eglCreatePbufferFromClientBuffer(
   EGLDisplay dpy, EGLenum buftype, EGLClientBuffer buffer,
   EGLConfig config, const EGLint *attrib_list)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_NO_SURFACE);
   // TODO: eglCreatePbufferFromClientBuffer()
   return setError(EGL_BAD_PARAMETER, EGL_NO_SURFACE);
}

// ----------------------------------------------------------------------------
// EGL_EGLEXT_VERSION 3
// ----------------------------------------------------------------------------

void (*eglGetProcAddress (const char *procname))()
{
   extention_map_t const * const map = gExtentionMap;
   for (uint32_t i=0 ; i<NELEM(gExtentionMap) ; i++) {
      if (!strcmp(procname, map[i].name)) {
         return map[i].address;
      }
   }
   return NULL;
}

EGLBoolean eglLockSurfaceKHR(EGLDisplay dpy, EGLSurface surface,
                             const EGLint *attrib_list)
{
   EGLBoolean result = EGL_FALSE;
   return result;
}

EGLBoolean eglUnlockSurfaceKHR(EGLDisplay dpy, EGLSurface surface)
{
   EGLBoolean result = EGL_FALSE;
   return result;
}

EGLImageKHR eglCreateImageKHR(EGLDisplay dpy, EGLContext ctx, EGLenum target,
                              EGLClientBuffer buffer, const EGLint *attrib_list)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE) {
      return setError(EGL_BAD_DISPLAY, EGL_NO_IMAGE_KHR);
   }
   if (ctx != EGL_NO_CONTEXT) {
      return setError(EGL_BAD_CONTEXT, EGL_NO_IMAGE_KHR);
   }
   if (target != EGL_NATIVE_BUFFER_ANDROID) {
      return setError(EGL_BAD_PARAMETER, EGL_NO_IMAGE_KHR);
   }

   android_native_buffer_t* native_buffer = (android_native_buffer_t*)buffer;

   if (native_buffer->common.magic != ANDROID_NATIVE_BUFFER_MAGIC)
      return setError(EGL_BAD_PARAMETER, EGL_NO_IMAGE_KHR);

   if (native_buffer->common.version != sizeof(android_native_buffer_t))
      return setError(EGL_BAD_PARAMETER, EGL_NO_IMAGE_KHR);

   switch (native_buffer->format) {
   case HAL_PIXEL_FORMAT_RGBA_8888:
   case HAL_PIXEL_FORMAT_RGBX_8888:
   case HAL_PIXEL_FORMAT_RGB_888:
   case HAL_PIXEL_FORMAT_RGB_565:
   case HAL_PIXEL_FORMAT_BGRA_8888:
   case HAL_PIXEL_FORMAT_RGBA_5551:
   case HAL_PIXEL_FORMAT_RGBA_4444:
      break;
   default:
      return setError(EGL_BAD_PARAMETER, EGL_NO_IMAGE_KHR);
   }

   native_buffer->common.incRef(&native_buffer->common);
   return (EGLImageKHR)native_buffer;
}

EGLBoolean eglDestroyImageKHR(EGLDisplay dpy, EGLImageKHR img)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE) {
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);
   }

   android_native_buffer_t* native_buffer = (android_native_buffer_t*)img;

   if (native_buffer->common.magic != ANDROID_NATIVE_BUFFER_MAGIC)
      return setError(EGL_BAD_PARAMETER, EGL_FALSE);

   if (native_buffer->common.version != sizeof(android_native_buffer_t))
      return setError(EGL_BAD_PARAMETER, EGL_FALSE);

   native_buffer->common.decRef(&native_buffer->common);

   return EGL_TRUE;
}

// ----------------------------------------------------------------------------
// ANDROID extensions
// ----------------------------------------------------------------------------

EGLBoolean eglSetSwapRectangleANDROID(EGLDisplay dpy, EGLSurface draw,
                                      EGLint left, EGLint top, EGLint width, EGLint height)
{
   if (egl_display_t::is_valid(dpy) == EGL_FALSE)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   egl_surface_t* d = static_cast<egl_surface_t*>(draw);
   if (!d->isValid())
      return setError(EGL_BAD_SURFACE, EGL_FALSE);
   if (d->dpy != dpy)
      return setError(EGL_BAD_DISPLAY, EGL_FALSE);

   // post the surface
   d->setSwapRectangle(left, top, width, height);

   return EGL_TRUE;
}