Add GL context creation for X so that gm can run GPU on Linux.
http://codereview.appspot.com/4548047/
git-svn-id: http://skia.googlecode.com/svn/trunk@1343 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/unix/SkEGLContext_Unix.cpp b/src/utils/unix/SkEGLContext_Unix.cpp
new file mode 100644
index 0000000..7921b8a
--- /dev/null
+++ b/src/utils/unix/SkEGLContext_Unix.cpp
@@ -0,0 +1,264 @@
+#include "SkEGLContext.h"
+#include "SkTypes.h"
+
+#include <GL/gl.h>
+#include <GL/glext.h>
+#include <GL/glu.h>
+#include <GL/glx.h>
+#include <X11/Xlib.h>
+
+#define SK_GL_GET_PROC(T, F) T F = NULL; \
+ F = (T) glXGetProcAddressARB(reinterpret_cast<const GLubyte*>(#F));
+
+static bool ctxErrorOccurred = false;
+static int ctxErrorHandler(Display *dpy, XErrorEvent *ev) {
+ ctxErrorOccurred = true;
+ return 0;
+}
+
+SkEGLContext::SkEGLContext() : context(NULL), display(NULL), pixmap(0), glxPixmap(0) {
+}
+
+SkEGLContext::~SkEGLContext() {
+ if (this->display) {
+ glXMakeCurrent(this->display, 0, 0);
+
+ if (this->context)
+ glXDestroyContext(this->display, this->context);
+
+ if (this->glxPixmap)
+ glXDestroyGLXPixmap(this->display, this->glxPixmap);
+
+ if (this->pixmap)
+ XFreePixmap(this->display, this->pixmap);
+
+ XCloseDisplay(this->display);
+ }
+}
+
+bool SkEGLContext::init(const int width, const int height) {
+ Display *display = XOpenDisplay(0);
+ this->display = display;
+
+ if (!display) {
+ SkDebugf("Failed to open X display.\n");
+ return false;
+ }
+
+ // Get a matching FB config
+ static int visual_attribs[] = {
+ GLX_X_RENDERABLE , True,
+ GLX_DRAWABLE_TYPE , GLX_PIXMAP_BIT,
+ GLX_RENDER_TYPE , GLX_RGBA_BIT,
+ GLX_X_VISUAL_TYPE , GLX_TRUE_COLOR,
+ GLX_RED_SIZE , 8,
+ GLX_GREEN_SIZE , 8,
+ GLX_BLUE_SIZE , 8,
+ GLX_ALPHA_SIZE , 8,
+ GLX_DEPTH_SIZE , 24,
+ GLX_STENCIL_SIZE , 8,
+ GLX_DOUBLEBUFFER , True,
+ //GLX_SAMPLE_BUFFERS , 1,
+ //GLX_SAMPLES , 4,
+ None
+ };
+
+ int glx_major, glx_minor;
+
+ // FBConfigs were added in GLX version 1.3.
+ if (!glXQueryVersion( display, &glx_major, &glx_minor) ||
+ ( (glx_major == 1) && (glx_minor < 3) ) || (glx_major < 1))
+ {
+ SkDebugf("Invalid GLX version.");
+ return false;
+ }
+
+ //SkDebugf("Getting matching framebuffer configs.\n");
+ int fbcount;
+ GLXFBConfig *fbc = glXChooseFBConfig(display, DefaultScreen(display),
+ visual_attribs, &fbcount);
+ if (!fbc) {
+ SkDebugf("Failed to retrieve a framebuffer config.\n");
+ return false;
+ }
+ //SkDebugf("Found %d matching FB configs.\n", fbcount);
+
+ // Pick the FB config/visual with the most samples per pixel
+ //SkDebugf("Getting XVisualInfos.\n");
+ int best_fbc = -1, worst_fbc = -1, best_num_samp = -1, worst_num_samp = 999;
+
+ int i;
+ for (i = 0; i < fbcount; ++i) {
+ XVisualInfo *vi = glXGetVisualFromFBConfig(display, fbc[i]);
+ if (vi) {
+ int samp_buf, samples;
+ glXGetFBConfigAttrib(display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf);
+ glXGetFBConfigAttrib(display, fbc[i], GLX_SAMPLES, &samples);
+
+ //SkDebugf(" Matching fbconfig %d, visual ID 0x%2x: SAMPLE_BUFFERS = %d,"
+ // " SAMPLES = %d\n",
+ // i, (unsigned int)vi->visualid, samp_buf, samples);
+
+ if (best_fbc < 0 || (samp_buf && samples > best_num_samp))
+ best_fbc = i, best_num_samp = samples;
+ if (worst_fbc < 0 || !samp_buf || samples < worst_num_samp)
+ worst_fbc = i, worst_num_samp = samples;
+ }
+ XFree(vi);
+ }
+
+ GLXFBConfig bestFbc = fbc[best_fbc];
+
+ // Be sure to free the FBConfig list allocated by glXChooseFBConfig()
+ XFree(fbc);
+
+ // Get a visual
+ XVisualInfo *vi = glXGetVisualFromFBConfig(display, bestFbc);
+ //SkDebugf("Chosen visual ID = 0x%x\n", (unsigned int)vi->visualid);
+
+ Pixmap pixmap = XCreatePixmap(
+ display, RootWindow(display, vi->screen), width, height, vi->depth
+ );
+
+ this->pixmap = pixmap;
+ if (!pixmap) {
+ SkDebugf("Failed to create pixmap.\n");
+ return false;
+ }
+
+ GLXPixmap glxPixmap = glXCreateGLXPixmap(display, vi, pixmap);
+ this->glxPixmap = glxPixmap;
+
+ // Done with the visual info data
+ XFree(vi);
+
+ // Create the context
+ GLXContext ctx = 0;
+
+ // Install an X error handler so the application won't exit if GL 3.0
+ // context allocation fails.
+ //
+ // Note this error handler is global.
+ // All display connections in all threads of a process use the same
+ // error handler, so be sure to guard against other threads issuing
+ // X commands while this code is running.
+ ctxErrorOccurred = false;
+ int (*oldHandler)(Display*, XErrorEvent*) =
+ XSetErrorHandler(&ctxErrorHandler);
+
+ // Get the default screen's GLX extension list
+ const char *glxExts = glXQueryExtensionsString(
+ display, DefaultScreen(display)
+ );
+ // Check for the GLX_ARB_create_context extension string and the function.
+ // If either is not present, use GLX 1.3 context creation method.
+ if (!gluCheckExtension(
+ reinterpret_cast<const GLubyte*>("GLX_ARB_create_context")
+ , reinterpret_cast<const GLubyte*>(glxExts)))
+ {
+ //SkDebugf("GLX_ARB_create_context not found."
+ // " Using old-style GLX context.\n");
+ ctx = glXCreateNewContext(display, bestFbc, GLX_RGBA_TYPE, 0, True);
+
+ } else {
+ //SkDebugf("Creating context.\n");
+
+ SK_GL_GET_PROC(PFNGLXCREATECONTEXTATTRIBSARBPROC, glXCreateContextAttribsARB)
+ int context_attribs[] = {
+ GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
+ GLX_CONTEXT_MINOR_VERSION_ARB, 0,
+ //GLX_CONTEXT_FLAGS_ARB , GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
+ None
+ };
+ ctx = glXCreateContextAttribsARB(
+ display, bestFbc, 0, True, context_attribs
+ );
+
+ // Sync to ensure any errors generated are processed.
+ XSync(display, False);
+ if (!ctxErrorOccurred && ctx) {
+ //SkDebugf( "Created GL 3.0 context.\n" );
+ } else {
+ // Couldn't create GL 3.0 context.
+ // Fall back to old-style 2.x context.
+ // When a context version below 3.0 is requested,
+ // implementations will return the newest context version compatible
+ // with OpenGL versions less than version 3.0.
+
+ // GLX_CONTEXT_MAJOR_VERSION_ARB = 1
+ context_attribs[1] = 1;
+ // GLX_CONTEXT_MINOR_VERSION_ARB = 0
+ context_attribs[3] = 0;
+
+ ctxErrorOccurred = false;
+
+ //SkDebugf("Failed to create GL 3.0 context."
+ // " Using old-style GLX context.\n");
+ ctx = glXCreateContextAttribsARB(
+ display, bestFbc, 0, True, context_attribs
+ );
+ }
+ }
+
+ // Sync to ensure any errors generated are processed.
+ XSync(display, False);
+
+ // Restore the original error handler
+ XSetErrorHandler(oldHandler);
+
+ if (ctxErrorOccurred || !ctx) {
+ SkDebugf("Failed to create an OpenGL context.\n");
+ return false;
+ }
+ this->context = ctx;
+
+ // Verify that context is a direct context
+ if (!glXIsDirect(display, ctx)) {
+ //SkDebugf("Indirect GLX rendering context obtained.\n");
+ } else {
+ //SkDebugf("Direct GLX rendering context obtained.\n");
+ }
+
+ //SkDebugf("Making context current.\n");
+ if (!glXMakeCurrent(display, glxPixmap, ctx)) {
+ SkDebugf("Could not set the context.\n");
+ return false;
+ }
+
+ //Setup the framebuffers
+ const GLubyte* glExts = glGetString(GL_EXTENSIONS);
+ if (!gluCheckExtension(
+ reinterpret_cast<const GLubyte*>("GL_EXT_framebuffer_object")
+ , glExts))
+ {
+ SkDebugf("GL_EXT_framebuffer_object not found.\n");
+ return false;
+ }
+ SK_GL_GET_PROC(PFNGLGENFRAMEBUFFERSEXTPROC, glGenFramebuffersEXT)
+ SK_GL_GET_PROC(PFNGLBINDFRAMEBUFFEREXTPROC, glBindFramebufferEXT)
+ SK_GL_GET_PROC(PFNGLGENRENDERBUFFERSPROC, glGenRenderbuffersEXT)
+ SK_GL_GET_PROC(PFNGLBINDRENDERBUFFERPROC, glBindRenderbufferEXT)
+ SK_GL_GET_PROC(PFNGLRENDERBUFFERSTORAGEPROC, glRenderbufferStorageEXT)
+ SK_GL_GET_PROC(PFNGLFRAMEBUFFERRENDERBUFFERPROC, glFramebufferRenderbufferEXT)
+ SK_GL_GET_PROC(PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC, glCheckFramebufferStatusEXT)
+
+ GLuint fboID;
+ GLuint cbID;
+ GLuint dsID;
+ glGenFramebuffersEXT(1, &fboID);
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboID);
+ glGenRenderbuffersEXT(1, &cbID);
+ glBindRenderbufferEXT(GL_RENDERBUFFER, cbID);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_RGBA, width, height);
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, cbID);
+ glGenRenderbuffersEXT(1, &dsID);
+ glBindRenderbufferEXT(GL_RENDERBUFFER, dsID);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER, GL_DEPTH_STENCIL, width, height);
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, dsID);
+ glViewport(0, 0, width, height);
+ glClearStencil(0);
+ glClear(GL_STENCIL_BUFFER_BIT);
+
+ GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
+ return GL_FRAMEBUFFER_COMPLETE == status;
+}