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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.
*/
#include "PixelBuffer.h"
#include "Debug.h"
#include "Extensions.h"
#include "Properties.h"
#include "renderstate/RenderState.h"
#include "utils/GLUtils.h"
#include <utils/Log.h>
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// CPU pixel buffer
///////////////////////////////////////////////////////////////////////////////
class CpuPixelBuffer: public PixelBuffer {
public:
CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
uint8_t* map(AccessMode mode = kAccessMode_ReadWrite) override;
void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) override;
protected:
void unmap() override;
private:
std::unique_ptr<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)]) {
}
uint8_t* CpuPixelBuffer::map(AccessMode mode) {
if (mAccessMode == kAccessMode_None) {
mAccessMode = mode;
}
return mBuffer.get();
}
void CpuPixelBuffer::unmap() {
mAccessMode = kAccessMode_None;
}
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) override;
void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) override;
protected:
void unmap() override;
private:
GLuint mBuffer;
uint8_t* mMappedPointer;
Caches& mCaches;
};
GpuPixelBuffer::GpuPixelBuffer(GLenum format,
uint32_t width, uint32_t height)
: PixelBuffer(format, width, height)
, mMappedPointer(nullptr)
, mCaches(Caches::getInstance()){
glGenBuffers(1, &mBuffer);
mCaches.pixelBufferState().bind(mBuffer);
glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), nullptr, GL_DYNAMIC_DRAW);
mCaches.pixelBufferState().unbind();
}
GpuPixelBuffer::~GpuPixelBuffer() {
glDeleteBuffers(1, &mBuffer);
}
uint8_t* GpuPixelBuffer::map(AccessMode mode) {
if (mAccessMode == kAccessMode_None) {
mCaches.pixelBufferState().bind(mBuffer);
mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
if (CC_UNLIKELY(!mMappedPointer)) {
GLUtils::dumpGLErrors();
LOG_ALWAYS_FATAL("Failed to map PBO");
}
mAccessMode = mode;
mCaches.pixelBufferState().unbind();
}
return mMappedPointer;
}
void GpuPixelBuffer::unmap() {
if (mAccessMode != kAccessMode_None) {
if (mMappedPointer) {
mCaches.pixelBufferState().bind(mBuffer);
GLboolean status = glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
if (status == GL_FALSE) {
ALOGE("Corrupted GPU pixel buffer");
}
}
mAccessMode = kAccessMode_None;
mMappedPointer = nullptr;
}
}
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.pixelBufferState().bind(mBuffer);
unmap();
glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
GL_UNSIGNED_BYTE, reinterpret_cast<void*>(offset));
mCaches.pixelBufferState().unbind();
}
///////////////////////////////////////////////////////////////////////////////
// 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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