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/*
* 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 <GLES2/gl2.h>
#include <utils/Log.h>
#include "LayerCache.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
LayerCache::LayerCache(uint32_t maxByteSize):
mCache(GenerationCache<LayerSize, Layer*>::kUnlimitedCapacity),
mIdGenerator(1), mSize(0), mMaxSize(maxByteSize) {
}
LayerCache::~LayerCache() {
clear();
}
///////////////////////////////////////////////////////////////////////////////
// Size management
///////////////////////////////////////////////////////////////////////////////
uint32_t LayerCache::getSize() {
return mSize;
}
uint32_t LayerCache::getMaxSize() {
return mMaxSize;
}
void LayerCache::setMaxSize(uint32_t maxSize) {
mMaxSize = maxSize;
while (mSize > mMaxSize) {
Layer* oldest = mCache.removeOldest();
deleteLayer(oldest);
}
}
///////////////////////////////////////////////////////////////////////////////
// Callbacks
///////////////////////////////////////////////////////////////////////////////
void LayerCache::operator()(LayerSize& size, Layer*& layer) {
deleteLayer(layer);
}
///////////////////////////////////////////////////////////////////////////////
// Caching
///////////////////////////////////////////////////////////////////////////////
void LayerCache::deleteLayer(Layer* layer) {
if (layer) {
mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4;
glDeleteFramebuffers(1, &layer->fbo);
glDeleteTextures(1, &layer->texture);
delete layer;
}
}
void LayerCache::clear() {
mCache.setOnEntryRemovedListener(this);
mCache.clear();
mCache.setOnEntryRemovedListener(NULL);
}
Layer* LayerCache::get(LayerSize& size, GLuint previousFbo) {
Layer* layer = mCache.remove(size);
if (layer) {
LAYER_LOGD("Reusing layer");
mSize -= layer->layer.getWidth() * layer->layer.getHeight() * 4;
} else {
LAYER_LOGD("Creating new layer");
layer = new Layer;
layer->blend = true;
// Generate the FBO and attach the texture
glGenFramebuffers(1, &layer->fbo);
glBindFramebuffer(GL_FRAMEBUFFER, layer->fbo);
// Generate the texture in which the FBO will draw
glGenTextures(1, &layer->texture);
glBindTexture(GL_TEXTURE_2D, layer->texture);
// The FBO will not be scaled, so we can use lower quality filtering
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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, size.width, size.height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, NULL);
// Bind texture to FBO
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
layer->texture, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
LOGE("Framebuffer incomplete (GL error code 0x%x)", status);
glBindFramebuffer(GL_FRAMEBUFFER, previousFbo);
glDeleteFramebuffers(1, &layer->fbo);
glDeleteTextures(1, &layer->texture);
delete layer;
return NULL;
}
}
return layer;
}
bool LayerCache::put(LayerSize& layerSize, Layer* layer) {
const uint32_t size = layerSize.width * layerSize.height * 4;
// Don't even try to cache a layer that's bigger than the cache
if (size < mMaxSize) {
while (mSize + size > mMaxSize) {
Layer* oldest = mCache.removeOldest();
deleteLayer(oldest);
}
layerSize.id = mIdGenerator++;
mCache.put(layerSize, layer);
mSize += size;
return true;
}
return false;
}
}; // namespace uirenderer
}; // namespace android
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