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/*
* Copyright (C) 2013 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 <utils/Log.h>
#include "Caches.h"
#include "Debug.h"
#include "Extensions.h"
#include "PixelBuffer.h"
#include "Properties.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// CPU pixel buffer
///////////////////////////////////////////////////////////////////////////////
class CpuPixelBuffer: public PixelBuffer {
public:
CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
~CpuPixelBuffer();
uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
void unmap();
uint8_t* getMappedPointer() const;
void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
private:
uint8_t* mBuffer;
};
CpuPixelBuffer::CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
PixelBuffer(format, width, height) {
mBuffer = new uint8_t[width * height * formatSize(format)];
}
CpuPixelBuffer::~CpuPixelBuffer() {
delete[] mBuffer;
}
uint8_t* CpuPixelBuffer::map(AccessMode mode) {
if (mAccessMode == kAccessMode_None) {
mAccessMode = mode;
}
return mBuffer;
}
void CpuPixelBuffer::unmap() {
mAccessMode = kAccessMode_None;
}
uint8_t* CpuPixelBuffer::getMappedPointer() const {
return mAccessMode == kAccessMode_None ? NULL : mBuffer;
}
void CpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height,
mFormat, GL_UNSIGNED_BYTE, mBuffer + offset);
}
///////////////////////////////////////////////////////////////////////////////
// GPU pixel buffer
///////////////////////////////////////////////////////////////////////////////
class GpuPixelBuffer: public PixelBuffer {
public:
GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
~GpuPixelBuffer();
uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
void unmap();
uint8_t* getMappedPointer() const;
void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
private:
GLuint mBuffer;
uint8_t* mMappedPointer;
Caches& mCaches;
};
GpuPixelBuffer::GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
PixelBuffer(format, width, height), mMappedPointer(0), mCaches(Caches::getInstance()) {
glGenBuffers(1, &mBuffer);
mCaches.bindPixelBuffer(mBuffer);
glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), NULL, GL_DYNAMIC_DRAW);
mCaches.unbindPixelBuffer();
}
GpuPixelBuffer::~GpuPixelBuffer() {
glDeleteBuffers(1, &mBuffer);
}
uint8_t* GpuPixelBuffer::map(AccessMode mode) {
if (mAccessMode == kAccessMode_None) {
mCaches.bindPixelBuffer(mBuffer);
mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
#if DEBUG_OPENGL
if (!mMappedPointer) {
GLenum status = GL_NO_ERROR;
while ((status = glGetError()) != GL_NO_ERROR) {
ALOGE("Could not map GPU pixel buffer: 0x%x", status);
}
}
#endif
mAccessMode = mode;
}
return mMappedPointer;
}
void GpuPixelBuffer::unmap() {
if (mAccessMode != kAccessMode_None) {
if (mMappedPointer) {
mCaches.bindPixelBuffer(mBuffer);
GLboolean status = glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
if (status == GL_FALSE) {
ALOGE("Corrupted GPU pixel buffer");
}
}
mAccessMode = kAccessMode_None;
mMappedPointer = NULL;
}
}
uint8_t* GpuPixelBuffer::getMappedPointer() const {
return mMappedPointer;
}
void GpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
// If the buffer is not mapped, unmap() will not bind it
mCaches.bindPixelBuffer(mBuffer);
unmap();
glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
GL_UNSIGNED_BYTE, reinterpret_cast<void*>(offset));
}
///////////////////////////////////////////////////////////////////////////////
// Factory
///////////////////////////////////////////////////////////////////////////////
PixelBuffer* PixelBuffer::create(GLenum format, uint32_t width, uint32_t height, BufferType type) {
if (type == kBufferType_Auto && Caches::getInstance().gpuPixelBuffersEnabled) {
return new GpuPixelBuffer(format, width, height);
}
return new CpuPixelBuffer(format, width, height);
}
}; // namespace uirenderer
}; // namespace android
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