Add fine-grained debug layer

Full GLES error checking layer via -include
trickery. Change DEBUG_OPENGL to a level system.

HIGH = every GL call is error checked
MODERATE = checkpointing at interesting spots
LOW = only asserts there are no errors at the end of a frame
 or when the FBO changes
NONE = AIN'T GOT NO TIME FOR ERRORS GOTTA GO FAST!

Change-Id: Ibe81aae93d942059c4ddf1cbb11c828b7ce4c10b
diff --git a/libs/hwui/debug/nullgles.cpp b/libs/hwui/debug/nullgles.cpp
new file mode 100644
index 0000000..ffb0649
--- /dev/null
+++ b/libs/hwui/debug/nullgles.cpp
@@ -0,0 +1,275 @@
+/*
+ * Copyright(C) 2015 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 "unwrap_gles.h"
+
+#include <GLES3/gl3.h>
+#include <GLES2/gl2ext.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+struct {
+    GLboolean scissorEnabled;
+} gState;
+
+void glGenCommon(GLsizei n, GLuint *buffers) {
+    static GLuint nextId = 0;
+    int i;
+    for(i = 0; i < n; i++) {
+        buffers[i] = ++nextId;
+    }
+}
+
+void glGenBuffers(GLsizei n, GLuint *buffers) {
+    glGenCommon(n, buffers);
+}
+
+void glGenFramebuffers(GLsizei n, GLuint *framebuffers) {
+    glGenCommon(n, framebuffers);
+}
+
+void glGenRenderbuffers(GLsizei n, GLuint *renderbuffers) {
+    glGenCommon(n, renderbuffers);
+}
+
+void glGenTextures(GLsizei n, GLuint *textures) {
+    glGenCommon(n, textures);
+}
+
+GLuint glCreateProgram(void) {
+    static GLuint nextProgram = 0;
+    return ++nextProgram;
+}
+
+GLuint glCreateShader(GLenum type) {
+    static GLuint nextShader = 0;
+    return ++nextShader;
+}
+
+void glGetProgramiv(GLuint program, GLenum pname, GLint *params) {
+    switch (pname) {
+    case GL_DELETE_STATUS:
+    case GL_LINK_STATUS:
+    case GL_VALIDATE_STATUS:
+        *params = GL_TRUE;
+        break;
+    case GL_INFO_LOG_LENGTH:
+        *params = 16;
+        break;
+    }
+}
+
+void glGetProgramInfoLog(GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog) {
+    *length = snprintf(infoLog, bufSize, "success");
+    if (*length >= bufSize) {
+        *length = bufSize - 1;
+    }
+}
+
+void glGetShaderiv(GLuint shader, GLenum pname, GLint *params) {
+    switch (pname) {
+    case GL_COMPILE_STATUS:
+    case GL_DELETE_STATUS:
+        *params = GL_TRUE;
+    }
+}
+
+void glGetShaderInfoLog(GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog) {
+    *length = snprintf(infoLog, bufSize, "success");
+    if (*length >= bufSize) {
+        *length = bufSize - 1;
+    }
+}
+
+void setBooleanState(GLenum cap, GLboolean value) {
+    switch (cap) {
+    case GL_SCISSOR_TEST:
+        gState.scissorEnabled = value;
+        break;
+    }
+}
+
+void glEnable(GLenum cap) {
+    setBooleanState(cap, GL_TRUE);
+}
+
+void glDisable(GLenum cap) {
+    setBooleanState(cap, GL_FALSE);
+}
+
+GLboolean glIsEnabled(GLenum cap) {
+    switch (cap) {
+    case GL_SCISSOR_TEST:
+        return gState.scissorEnabled;
+    default:
+        return GL_FALSE;
+    }
+}
+
+void glGetIntegerv(GLenum pname, GLint *data) {
+    switch (pname) {
+    case GL_MAX_TEXTURE_SIZE:
+        *data = 2048;
+        break;
+    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
+        *data = 4;
+        break;
+    default:
+        *data = 0;
+    }
+}
+
+const char* getString(GLenum name) {
+    switch (name) {
+    case GL_VENDOR:
+        return "android";
+    case GL_RENDERER:
+        return "null";
+    case GL_VERSION:
+        return "OpenGL ES 2.0 rev1";
+    case GL_SHADING_LANGUAGE_VERSION:
+        return "OpenGL ES GLSL ES 2.0 rev1";
+    case GL_EXTENSIONS:
+    default:
+        return "";
+    }
+}
+
+const GLubyte* glGetString(GLenum name) {
+    return (GLubyte*) getString(name);
+}
+
+void glActiveTexture(GLenum texture) {}
+void glAttachShader(GLuint program, GLuint shader) {}
+void glBindAttribLocation(GLuint program, GLuint index, const GLchar *name) {}
+void glBindBuffer(GLenum target, GLuint buffer) {}
+void glBindFramebuffer(GLenum target, GLuint framebuffer) {}
+void glBindRenderbuffer(GLenum target, GLuint renderbuffer) {}
+void glBindTexture(GLenum target, GLuint texture) {}
+void glBlendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha) {}
+void glBlendEquation(GLenum mode) {}
+void glBlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha) {}
+void glBlendFunc(GLenum sfactor, GLenum dfactor) {}
+void glBlendFuncSeparate(GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha) {}
+void glBufferData(GLenum target, GLsizeiptr size, const void *data, GLenum usage) {}
+void glBufferSubData(GLenum target, GLintptr offset, GLsizeiptr size, const void *data) {}
+void glClear(GLbitfield mask) {}
+void glClearColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha) {}
+void glClearDepthf(GLfloat d) {}
+void glClearStencil(GLint s) {}
+void glColorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha) {}
+void glCompileShader(GLuint shader) {}
+void glCompressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const void *data) {}
+void glCompressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *data) {}
+void glCopyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border) {}
+void glCopyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height) {}
+void glCullFace(GLenum mode) {}
+void glDeleteBuffers(GLsizei n, const GLuint *buffers) {}
+void glDeleteFramebuffers(GLsizei n, const GLuint *framebuffers) {}
+void glDeleteProgram(GLuint program) {}
+void glDeleteRenderbuffers(GLsizei n, const GLuint *renderbuffers) {}
+void glDeleteShader(GLuint shader) {}
+void glDeleteTextures(GLsizei n, const GLuint *textures) {}
+void glDepthFunc(GLenum func) {}
+void glDepthMask(GLboolean flag) {}
+void glDepthRangef(GLfloat n, GLfloat f) {}
+void glDetachShader(GLuint program, GLuint shader) {}
+void glDisableVertexAttribArray(GLuint index) {}
+void glDrawArrays(GLenum mode, GLint first, GLsizei count) {}
+void glDrawElements(GLenum mode, GLsizei count, GLenum type, const void *indices) {}
+void glEnableVertexAttribArray(GLuint index) {}
+void glFinish(void) {}
+void glFlush(void) {}
+void glFramebufferRenderbuffer(GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer) {}
+void glFramebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level) {}
+void glFrontFace(GLenum mode) {}
+void glGenerateMipmap(GLenum target) {}
+GLint glGetAttribLocation(GLuint program, const GLchar *name) { return 1; }
+GLenum glGetError(void) { return GL_NO_ERROR; }
+GLint glGetUniformLocation(GLuint program, const GLchar *name) { return 2; }
+void glHint(GLenum target, GLenum mode) {}
+void glLineWidth(GLfloat width) {}
+void glLinkProgram(GLuint program) {}
+void glPixelStorei(GLenum pname, GLint param) {}
+void glPolygonOffset(GLfloat factor, GLfloat units) {}
+void glReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels) {}
+void glReleaseShaderCompiler(void) {}
+void glRenderbufferStorage(GLenum target, GLenum internalformat, GLsizei width, GLsizei height) {}
+void glSampleCoverage(GLfloat value, GLboolean invert) {}
+void glScissor(GLint x, GLint y, GLsizei width, GLsizei height) {}
+void glShaderBinary(GLsizei count, const GLuint *shaders, GLenum binaryformat, const void *binary, GLsizei length) {}
+void glShaderSource(GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length) {}
+void glStencilFunc(GLenum func, GLint ref, GLuint mask) {}
+void glStencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask) {}
+void glStencilMask(GLuint mask) {}
+void glStencilMaskSeparate(GLenum face, GLuint mask) {}
+void glStencilOp(GLenum fail, GLenum zfail, GLenum zpass) {}
+void glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass) {}
+void glTexImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels) {}
+void glTexParameterf(GLenum target, GLenum pname, GLfloat param) {}
+void glTexParameterfv(GLenum target, GLenum pname, const GLfloat *params) {}
+void glTexParameteri(GLenum target, GLenum pname, GLint param) {}
+void glTexParameteriv(GLenum target, GLenum pname, const GLint *params) {}
+void glTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const void *pixels) {}
+void glUniform1f(GLint location, GLfloat v0) {}
+void glUniform1fv(GLint location, GLsizei count, const GLfloat *value) {}
+void glUniform1i(GLint location, GLint v0) {}
+void glUniform1iv(GLint location, GLsizei count, const GLint *value) {}
+void glUniform2f(GLint location, GLfloat v0, GLfloat v1) {}
+void glUniform2fv(GLint location, GLsizei count, const GLfloat *value) {}
+void glUniform2i(GLint location, GLint v0, GLint v1) {}
+void glUniform2iv(GLint location, GLsizei count, const GLint *value) {}
+void glUniform3f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2) {}
+void glUniform3fv(GLint location, GLsizei count, const GLfloat *value) {}
+void glUniform3i(GLint location, GLint v0, GLint v1, GLint v2) {}
+void glUniform3iv(GLint location, GLsizei count, const GLint *value) {}
+void glUniform4f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3) {}
+void glUniform4fv(GLint location, GLsizei count, const GLfloat *value) {}
+void glUniform4i(GLint location, GLint v0, GLint v1, GLint v2, GLint v3) {}
+void glUniform4iv(GLint location, GLsizei count, const GLint *value) {}
+void glUniformMatrix2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) {}
+void glUniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) {}
+void glUniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) {}
+void glUseProgram(GLuint program) {}
+void glValidateProgram(GLuint program) {}
+void glVertexAttrib1f(GLuint index, GLfloat x) {}
+void glVertexAttrib1fv(GLuint index, const GLfloat *v) {}
+void glVertexAttrib2f(GLuint index, GLfloat x, GLfloat y) {}
+void glVertexAttrib2fv(GLuint index, const GLfloat *v) {}
+void glVertexAttrib3f(GLuint index, GLfloat x, GLfloat y, GLfloat z) {}
+void glVertexAttrib3fv(GLuint index, const GLfloat *v) {}
+void glVertexAttrib4f(GLuint index, GLfloat x, GLfloat y, GLfloat z, GLfloat w) {}
+void glVertexAttrib4fv(GLuint index, const GLfloat *v) {}
+void glVertexAttribPointer(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer) {}
+void glViewport(GLint x, GLint y, GLsizei width, GLsizei height) {}
+
+
+// gles2 ext
+void glInsertEventMarkerEXT(GLsizei length, const GLchar *marker) {}
+void glPushGroupMarkerEXT(GLsizei length, const GLchar *marker) {}
+void glPopGroupMarkerEXT(void) {}
+void glDiscardFramebufferEXT(GLenum target, GLsizei numAttachments, const GLenum *attachments) {}
+void glEGLImageTargetTexture2DOES(GLenum target, GLeglImageOES image) {}
+
+// GLES3
+void* glMapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length, GLbitfield access) {
+    return 0;
+}
+
+GLboolean glUnmapBuffer(GLenum target) {
+    return GL_FALSE;
+}