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/*
* Copyright (C) 2011 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 "LayerRenderer.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Rendering
///////////////////////////////////////////////////////////////////////////////
void LayerRenderer::prepare(bool opaque) {
glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &mPreviousFbo);
glBindFramebuffer(GL_FRAMEBUFFER, mFbo);
OpenGLRenderer::prepare(opaque);
}
void LayerRenderer::finish() {
OpenGLRenderer::finish();
glBindFramebuffer(GL_FRAMEBUFFER, mPreviousFbo);
}
///////////////////////////////////////////////////////////////////////////////
// Static functions
///////////////////////////////////////////////////////////////////////////////
GLuint LayerRenderer::createLayer(uint32_t width, uint32_t height,
uint32_t* layerWidth, uint32_t* layerHeight, GLuint* texture) {
GLuint previousFbo;
glGetIntegerv(GL_FRAMEBUFFER_BINDING, (GLint*) &previousFbo);
GLuint fbo = 0;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, texture);
glBindTexture(GL_TEXTURE_2D, *texture);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
if (glGetError() != GL_NO_ERROR) {
glDeleteBuffers(1, &fbo);
glDeleteTextures(1, texture);
glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
return 0;
}
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
*texture, 0);
if (glGetError() != GL_NO_ERROR) {
glDeleteBuffers(1, &fbo);
glDeleteTextures(1, texture);
glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
return 0;
}
glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
*layerWidth = width;
*layerHeight = height;
return fbo;
}
void LayerRenderer::resizeLayer(GLuint fbo, GLuint texture, uint32_t width, uint32_t height,
uint32_t* layerWidth, uint32_t* layerHeight) {
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
if (glGetError() != GL_NO_ERROR) {
glDeleteBuffers(1, &fbo);
glDeleteTextures(1, texture);
glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
*layerWidth = 0;
*layerHeight = 0;
return;
}
*layerWidth = width;
*layerHeight = height;
}
void LayerRenderer::destroyLayer(GLuint fbo, GLuint texture) {
if (fbo) glDeleteFramebuffers(1, &fbo);
if (texture) glDeleteTextures(1, &texture);
}
}; // namespace uirenderer
}; // namespace android
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