libs/hwui/OpenGLRenderer.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2010 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.
  */

 #define LOG_TAG "OpenGLRenderer"

 #include <stdlib.h>
 #include <stdint.h>
 #include <sys/types.h>

 #include <utils/Errors.h>
 #include <utils/KeyedVector.h>
 #include <utils/Log.h>

 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>

 #include <SkPaint.h>
 #include <SkXfermode.h>

 #include "OpenGLRenderer.h"
 #include "Matrix.h"

 namespace android {
 namespace uirenderer {

 ///////////////////////////////////////////////////////////////////////////////
 // Defines
 ///////////////////////////////////////////////////////////////////////////////

 #define V(x, y) { { x, y } }

 ///////////////////////////////////////////////////////////////////////////////
 // Globals
 ///////////////////////////////////////////////////////////////////////////////

 const SimpleVertex gDrawColorVertices[] = {
 		V(0.0f, 0.0f),
 		V(1.0f, 0.0f),
 		V(0.0f, 1.0f),
 		V(1.0f, 1.0f)
 };
 const GLsizei gDrawColorVertexStride = sizeof(SimpleVertex);
 const GLsizei gDrawColorVertexCount = 4;

 ///////////////////////////////////////////////////////////////////////////////
 // Shaders
 ///////////////////////////////////////////////////////////////////////////////

 #define SHADER_SOURCE(name, source) const char* name = #source

 #include "shaders/drawColor.vert"
 #include "shaders/drawColor.frag"

 Program::Program(const char* vertex, const char* fragment) {
 	vertexShader = buildShader(vertex, GL_VERTEX_SHADER);
 	fragmentShader = buildShader(fragment, GL_FRAGMENT_SHADER);

 	id = glCreateProgram();
 	glAttachShader(id, vertexShader);
 	glAttachShader(id, fragmentShader);
 	glLinkProgram(id);

 	GLint status;
 	glGetProgramiv(id, GL_LINK_STATUS, &status);
 	if (status != GL_TRUE) {
 		GLint infoLen = 0;
 		glGetProgramiv(id, GL_INFO_LOG_LENGTH, &infoLen);
 		if (infoLen > 1) {
 			char* log = (char*) malloc(sizeof(char) * infoLen);
 			glGetProgramInfoLog(id, infoLen, 0, log);
 			LOGE("Error while linking shaders: %s", log);
 			delete log;
 		}
 		glDeleteProgram(id);
 	}
 }

 Program::~Program() {
 	glDeleteShader(vertexShader);
 	glDeleteShader(fragmentShader);
 	glDeleteProgram(id);
 }

 void Program::use() {
 	glUseProgram(id);
 }

 int Program::addAttrib(const char* name) {
 	int slot = glGetAttribLocation(id, name);
 	attributes.add(name, slot);
 	return slot;
 }

 int Program::getAttrib(const char* name) {
 	return attributes.valueFor(name);
 }

 int Program::addUniform(const char* name) {
 	int slot = glGetUniformLocation(id, name);
 	uniforms.add(name, slot);
 	return slot;
 }

 int Program::getUniform(const char* name) {
 	return uniforms.valueFor(name);
 }

 GLuint Program::buildShader(const char* source, GLenum type) {
 	GLuint shader = glCreateShader(type);
 	glShaderSource(shader, 1, &source, 0);
 	glCompileShader(shader);

 	GLint status;
 	glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
 	if (status != GL_TRUE) {
 		// Some drivers return wrong values for GL_INFO_LOG_LENGTH
 		// use a fixed size instead
 		GLchar log[512];
 		glGetShaderInfoLog(shader, sizeof(log), 0, &log[0]);
 		LOGE("Error while compiling shader: %s", log);
 		glDeleteShader(shader);
 	}

 	return shader;
 }

 DrawColorProgram::DrawColorProgram():
 		Program(gDrawColorVertexShader, gDrawColorFragmentShader) {
 	position = addAttrib("position");
 	color = addAttrib("color");
 	projection = addUniform("projection");
 	modelView = addUniform("modelView");
 	transform = addUniform("transform");
 }

 void DrawColorProgram::use(const GLfloat* projectionMatrix, const GLfloat* modelViewMatrix,
         const GLfloat* transformMatrix) {
 	Program::use();
 	glUniformMatrix4fv(projection, 1, GL_FALSE, projectionMatrix);
 	glUniformMatrix4fv(modelView, 1, GL_FALSE, modelViewMatrix);
 	glUniformMatrix4fv(transform, 1, GL_FALSE, transformMatrix);
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Support
 ///////////////////////////////////////////////////////////////////////////////

 const Rect& Snapshot::getMappedClip() {
 	if (flags & kFlagDirtyTransform) {
 		flags &= ~kFlagDirtyTransform;
 		mappedClip.set(clipRect);
 		transform.mapRect(mappedClip);
 	}
 	return mappedClip;
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Constructors/destructor
 ///////////////////////////////////////////////////////////////////////////////

 OpenGLRenderer::OpenGLRenderer() {
     LOGD("Create OpenGLRenderer");

     mDrawColorShader = new DrawColorProgram;
 }

 OpenGLRenderer::~OpenGLRenderer() {
     LOGD("Destroy OpenGLRenderer");
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Setup
 ///////////////////////////////////////////////////////////////////////////////

 void OpenGLRenderer::setViewport(int width, int height) {
     glViewport(0, 0, width, height);

     mat4 ortho;
     ortho.loadOrtho(0, width, height, 0, -1, 1);
     ortho.copyTo(mOrthoMatrix);

     mWidth = width;
     mHeight = height;
 }

 void OpenGLRenderer::prepare() {
 	mSnapshot = &mFirstSnapshot;
 	mSaveCount = 0;

     glDisable(GL_SCISSOR_TEST);

     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
     glClear(GL_COLOR_BUFFER_BIT);

     glEnable(GL_SCISSOR_TEST);
     glScissor(0, 0, mWidth, mHeight);

     mSnapshot->clipRect.set(0.0f, 0.0f, mWidth, mHeight);
 }

 ///////////////////////////////////////////////////////////////////////////////
 // State management
 ///////////////////////////////////////////////////////////////////////////////

 int OpenGLRenderer::getSaveCount() const {
 	return mSaveCount;
 }

 int OpenGLRenderer::save(int flags) {
 	return saveSnapshot();
 }

 void OpenGLRenderer::restore() {
 	if (mSaveCount == 0) return;

 	if (restoreSnapshot()) {
 		setScissorFromClip();
 	}
 }

 void OpenGLRenderer::restoreToCount(int saveCount) {
 	if (saveCount <= 0 || saveCount > mSaveCount) return;

 	bool restoreClip = false;

 	while (mSaveCount != saveCount - 1) {
 		restoreClip |= restoreSnapshot();
 	}

 	if (restoreClip) {
 		setScissorFromClip();
 	}
 }

 int OpenGLRenderer::saveSnapshot() {
 	mSnapshot = new Snapshot(mSnapshot);
 	return ++mSaveCount;
 }

 bool OpenGLRenderer::restoreSnapshot() {
 	bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet;

 	mSaveCount--;

 	// Do not merge these two lines!
 	sp<Snapshot> previous = mSnapshot->previous;
 	mSnapshot = previous;

 	return restoreClip;
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Transforms
 ///////////////////////////////////////////////////////////////////////////////

 void OpenGLRenderer::translate(float dx, float dy) {
 	mSnapshot->transform.translate(dx, dy, 0.0f);
 	mSnapshot->flags |= Snapshot::kFlagDirtyTransform;
 }

 void OpenGLRenderer::rotate(float degrees) {
 	mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f);
 	mSnapshot->flags |= Snapshot::kFlagDirtyTransform;
 }

 void OpenGLRenderer::scale(float sx, float sy) {
 	mSnapshot->transform.scale(sx, sy, 1.0f);
 	mSnapshot->flags |= Snapshot::kFlagDirtyTransform;
 }

 void OpenGLRenderer::setMatrix(SkMatrix* matrix) {
 	mSnapshot->transform.load(*matrix);
 	mSnapshot->flags |= Snapshot::kFlagDirtyTransform;
 }

 void OpenGLRenderer::getMatrix(SkMatrix* matrix) {
 	mSnapshot->transform.copyTo(*matrix);
 }

 void OpenGLRenderer::concatMatrix(SkMatrix* matrix) {
 	mat4 m(*matrix);
 	mSnapshot->transform.multiply(m);
 	mSnapshot->flags |= Snapshot::kFlagDirtyTransform;
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Clipping
 ///////////////////////////////////////////////////////////////////////////////

 void OpenGLRenderer::setScissorFromClip() {
 	const Rect& clip = mSnapshot->getMappedClip();
 	glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight());
 }

 const Rect& OpenGLRenderer::getClipBounds() {
 	return mSnapshot->clipRect;
 }

 bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) {
     /*
      * The documentation of quickReject() indicates that the specified rect
      * is transformed before being compared to the clip rect. However, the
      * clip rect is not stored transformed in the snapshot and can thus be
      * compared directly
      *
      * The following code can be used instead to performed a mapped comparison:
      *
      *     mSnapshot->transform.mapRect(r);
      *     const Rect& clip = mSnapshot->getMappedClip();
      *     return !clip.intersects(r);
      */

     Rect r(left, top, right, bottom);
     return !mSnapshot->clipRect.intersects(r);
 }

 bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom) {
 	bool clipped = mSnapshot->clipRect.intersect(left, top, right, bottom);
 	if (clipped) {
 		mSnapshot->flags |= Snapshot::kFlagClipSet;
 		setScissorFromClip();
 	}
 	return clipped;
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Drawing
 ///////////////////////////////////////////////////////////////////////////////

 void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) {
     // TODO: Set the transfer mode
     const Rect& clip = mSnapshot->clipRect;
     drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color);
 }

 void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, SkPaint* paint) {
     // TODO Support more than  just color
     // TODO: Set the transfer mode
     drawColorRect(left, top, right, bottom, paint->getColor());
 }

 void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, int color) {
     GLfloat a = ((color >> 24) & 0xFF) / 255.0f;
     GLfloat r = ((color >> 16) & 0xFF) / 255.0f;
     GLfloat g = ((color >>  8) & 0xFF) / 255.0f;
     GLfloat b = ((color      ) & 0xFF) / 255.0f;

     mModelView.loadTranslate(left, top, 0.0f);
     mModelView.scale(right - left, bottom - top, 1.0f);

     mDrawColorShader->use(&mOrthoMatrix[0], &mModelView.data[0], &mSnapshot->transform.data[0]);

     const GLvoid* p = &gDrawColorVertices[0].position[0];

     glEnableVertexAttribArray(mDrawColorShader->position);
     glVertexAttribPointer(mDrawColorShader->position, 2, GL_FLOAT, GL_FALSE,
             gDrawColorVertexStride, p);
     glVertexAttrib4f(mDrawColorShader->color, r, g, b, a);

     glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawColorVertexCount);

     glDisableVertexAttribArray(mDrawColorShader->position);
 }

 }; // namespace uirenderer
 }; // namespace android
	/*
	* Copyright (C) 2010 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.
	*/

	#define LOG_TAG "OpenGLRenderer"

	#include <stdlib.h>
	#include <stdint.h>
	#include <sys/types.h>

	#include <utils/Errors.h>
	#include <utils/KeyedVector.h>
	#include <utils/Log.h>

	#include <GLES2/gl2.h>
	#include <GLES2/gl2ext.h>

	#include <SkPaint.h>
	#include <SkXfermode.h>

	#include "OpenGLRenderer.h"
	#include "Matrix.h"

	namespace android {
	namespace uirenderer {

	///////////////////////////////////////////////////////////////////////////////
	// Defines
	///////////////////////////////////////////////////////////////////////////////

	#define V(x, y) { { x, y } }

	///////////////////////////////////////////////////////////////////////////////
	// Globals
	///////////////////////////////////////////////////////////////////////////////

	const SimpleVertex gDrawColorVertices[] = {
	V(0.0f, 0.0f),
	V(1.0f, 0.0f),
	V(0.0f, 1.0f),
	V(1.0f, 1.0f)
	};
	const GLsizei gDrawColorVertexStride = sizeof(SimpleVertex);
	const GLsizei gDrawColorVertexCount = 4;

	///////////////////////////////////////////////////////////////////////////////
	// Shaders
	///////////////////////////////////////////////////////////////////////////////

	#define SHADER_SOURCE(name, source) const char* name = #source

	#include "shaders/drawColor.vert"
	#include "shaders/drawColor.frag"

	Program::Program(const char* vertex, const char* fragment) {
	vertexShader = buildShader(vertex, GL_VERTEX_SHADER);
	fragmentShader = buildShader(fragment, GL_FRAGMENT_SHADER);

	id = glCreateProgram();
	glAttachShader(id, vertexShader);
	glAttachShader(id, fragmentShader);
	glLinkProgram(id);

	GLint status;
	glGetProgramiv(id, GL_LINK_STATUS, &status);
	if (status != GL_TRUE) {
	GLint infoLen = 0;
	glGetProgramiv(id, GL_INFO_LOG_LENGTH, &infoLen);
	if (infoLen > 1) {
	char* log = (char) malloc(sizeof(char) infoLen);
	glGetProgramInfoLog(id, infoLen, 0, log);
	LOGE("Error while linking shaders: %s", log);
	delete log;
	}
	glDeleteProgram(id);
	}
	}

	Program::~Program() {
	glDeleteShader(vertexShader);
	glDeleteShader(fragmentShader);
	glDeleteProgram(id);
	}

	void Program::use() {
	glUseProgram(id);
	}

	int Program::addAttrib(const char* name) {
	int slot = glGetAttribLocation(id, name);
	attributes.add(name, slot);
	return slot;
	}

	int Program::getAttrib(const char* name) {
	return attributes.valueFor(name);
	}

	int Program::addUniform(const char* name) {
	int slot = glGetUniformLocation(id, name);
	uniforms.add(name, slot);
	return slot;
	}

	int Program::getUniform(const char* name) {
	return uniforms.valueFor(name);
	}

	GLuint Program::buildShader(const char* source, GLenum type) {
	GLuint shader = glCreateShader(type);
	glShaderSource(shader, 1, &source, 0);
	glCompileShader(shader);

	GLint status;
	glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
	if (status != GL_TRUE) {
	// Some drivers return wrong values for GL_INFO_LOG_LENGTH
	// use a fixed size instead
	GLchar log[512];
	glGetShaderInfoLog(shader, sizeof(log), 0, &log[0]);
	LOGE("Error while compiling shader: %s", log);
	glDeleteShader(shader);
	}

	return shader;
	}

	DrawColorProgram::DrawColorProgram():
	Program(gDrawColorVertexShader, gDrawColorFragmentShader) {
	position = addAttrib("position");
	color = addAttrib("color");
	projection = addUniform("projection");
	modelView = addUniform("modelView");
	transform = addUniform("transform");
	}

	void DrawColorProgram::use(const GLfloat* projectionMatrix, const GLfloat* modelViewMatrix,
	const GLfloat* transformMatrix) {
	Program::use();
	glUniformMatrix4fv(projection, 1, GL_FALSE, projectionMatrix);
	glUniformMatrix4fv(modelView, 1, GL_FALSE, modelViewMatrix);
	glUniformMatrix4fv(transform, 1, GL_FALSE, transformMatrix);
	}

	///////////////////////////////////////////////////////////////////////////////
	// Support
	///////////////////////////////////////////////////////////////////////////////

	const Rect& Snapshot::getMappedClip() {
	if (flags & kFlagDirtyTransform) {
	flags &= ~kFlagDirtyTransform;
	mappedClip.set(clipRect);
	transform.mapRect(mappedClip);
	}
	return mappedClip;
	}

	///////////////////////////////////////////////////////////////////////////////
	// Constructors/destructor
	///////////////////////////////////////////////////////////////////////////////

	OpenGLRenderer::OpenGLRenderer() {
	LOGD("Create OpenGLRenderer");

	mDrawColorShader = new DrawColorProgram;
	}

	OpenGLRenderer::~OpenGLRenderer() {
	LOGD("Destroy OpenGLRenderer");
	}

	///////////////////////////////////////////////////////////////////////////////
	// Setup
	///////////////////////////////////////////////////////////////////////////////

	void OpenGLRenderer::setViewport(int width, int height) {
	glViewport(0, 0, width, height);

	mat4 ortho;
	ortho.loadOrtho(0, width, height, 0, -1, 1);
	ortho.copyTo(mOrthoMatrix);

	mWidth = width;
	mHeight = height;
	}

	void OpenGLRenderer::prepare() {
	mSnapshot = &mFirstSnapshot;
	mSaveCount = 0;

	glDisable(GL_SCISSOR_TEST);

	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	glClear(GL_COLOR_BUFFER_BIT);

	glEnable(GL_SCISSOR_TEST);
	glScissor(0, 0, mWidth, mHeight);

	mSnapshot->clipRect.set(0.0f, 0.0f, mWidth, mHeight);
	}

	///////////////////////////////////////////////////////////////////////////////
	// State management
	///////////////////////////////////////////////////////////////////////////////

	int OpenGLRenderer::getSaveCount() const {
	return mSaveCount;
	}

	int OpenGLRenderer::save(int flags) {
	return saveSnapshot();
	}

	void OpenGLRenderer::restore() {
	if (mSaveCount == 0) return;

	if (restoreSnapshot()) {
	setScissorFromClip();
	}
	}

	void OpenGLRenderer::restoreToCount(int saveCount) {
	if (saveCount <= 0 \|\| saveCount > mSaveCount) return;

	bool restoreClip = false;

	while (mSaveCount != saveCount - 1) {
	restoreClip \|= restoreSnapshot();
	}

	if (restoreClip) {
	setScissorFromClip();
	}
	}

	int OpenGLRenderer::saveSnapshot() {
	mSnapshot = new Snapshot(mSnapshot);
	return ++mSaveCount;
	}

	bool OpenGLRenderer::restoreSnapshot() {
	bool restoreClip = mSnapshot->flags & Snapshot::kFlagClipSet;

	mSaveCount--;

	// Do not merge these two lines!
	sp<Snapshot> previous = mSnapshot->previous;
	mSnapshot = previous;

	return restoreClip;
	}

	///////////////////////////////////////////////////////////////////////////////
	// Transforms
	///////////////////////////////////////////////////////////////////////////////

	void OpenGLRenderer::translate(float dx, float dy) {
	mSnapshot->transform.translate(dx, dy, 0.0f);
	mSnapshot->flags \|= Snapshot::kFlagDirtyTransform;
	}

	void OpenGLRenderer::rotate(float degrees) {
	mSnapshot->transform.rotate(degrees, 0.0f, 0.0f, 1.0f);
	mSnapshot->flags \|= Snapshot::kFlagDirtyTransform;
	}

	void OpenGLRenderer::scale(float sx, float sy) {
	mSnapshot->transform.scale(sx, sy, 1.0f);
	mSnapshot->flags \|= Snapshot::kFlagDirtyTransform;
	}

	void OpenGLRenderer::setMatrix(SkMatrix* matrix) {
	mSnapshot->transform.load(*matrix);
	mSnapshot->flags \|= Snapshot::kFlagDirtyTransform;
	}

	void OpenGLRenderer::getMatrix(SkMatrix* matrix) {
	mSnapshot->transform.copyTo(*matrix);
	}

	void OpenGLRenderer::concatMatrix(SkMatrix* matrix) {
	mat4 m(*matrix);
	mSnapshot->transform.multiply(m);
	mSnapshot->flags \|= Snapshot::kFlagDirtyTransform;
	}

	///////////////////////////////////////////////////////////////////////////////
	// Clipping
	///////////////////////////////////////////////////////////////////////////////

	void OpenGLRenderer::setScissorFromClip() {
	const Rect& clip = mSnapshot->getMappedClip();
	glScissor(clip.left, mHeight - clip.bottom, clip.getWidth(), clip.getHeight());
	}

	const Rect& OpenGLRenderer::getClipBounds() {
	return mSnapshot->clipRect;
	}

	bool OpenGLRenderer::quickReject(float left, float top, float right, float bottom) {
	/*
	* The documentation of quickReject() indicates that the specified rect
	* is transformed before being compared to the clip rect. However, the
	* clip rect is not stored transformed in the snapshot and can thus be
	* compared directly
	*
	* The following code can be used instead to performed a mapped comparison:
	*
	* mSnapshot->transform.mapRect(r);
	* const Rect& clip = mSnapshot->getMappedClip();
	* return !clip.intersects(r);
	*/

	Rect r(left, top, right, bottom);
	return !mSnapshot->clipRect.intersects(r);
	}

	bool OpenGLRenderer::clipRect(float left, float top, float right, float bottom) {
	bool clipped = mSnapshot->clipRect.intersect(left, top, right, bottom);
	if (clipped) {
	mSnapshot->flags \|= Snapshot::kFlagClipSet;
	setScissorFromClip();
	}
	return clipped;
	}

	///////////////////////////////////////////////////////////////////////////////
	// Drawing
	///////////////////////////////////////////////////////////////////////////////

	void OpenGLRenderer::drawColor(int color, SkXfermode::Mode mode) {
	// TODO: Set the transfer mode
	const Rect& clip = mSnapshot->clipRect;
	drawColorRect(clip.left, clip.top, clip.right, clip.bottom, color);
	}

	void OpenGLRenderer::drawRect(float left, float top, float right, float bottom, SkPaint* paint) {
	// TODO Support more than just color
	// TODO: Set the transfer mode
	drawColorRect(left, top, right, bottom, paint->getColor());
	}

	void OpenGLRenderer::drawColorRect(float left, float top, float right, float bottom, int color) {
	GLfloat a = ((color >> 24) & 0xFF) / 255.0f;
	GLfloat r = ((color >> 16) & 0xFF) / 255.0f;
	GLfloat g = ((color >> 8) & 0xFF) / 255.0f;
	GLfloat b = ((color ) & 0xFF) / 255.0f;

	mModelView.loadTranslate(left, top, 0.0f);
	mModelView.scale(right - left, bottom - top, 1.0f);

	mDrawColorShader->use(&mOrthoMatrix[0], &mModelView.data[0], &mSnapshot->transform.data[0]);

	const GLvoid* p = &gDrawColorVertices[0].position[0];

	glEnableVertexAttribArray(mDrawColorShader->position);
	glVertexAttribPointer(mDrawColorShader->position, 2, GL_FLOAT, GL_FALSE,
	gDrawColorVertexStride, p);
	glVertexAttrib4f(mDrawColorShader->color, r, g, b, a);

	glDrawArrays(GL_TRIANGLE_STRIP, 0, gDrawColorVertexCount);

	glDisableVertexAttribArray(mDrawColorShader->position);
	}

	}; // namespace uirenderer
	}; // namespace android