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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "OpenGLRenderer"
     18 
     19 #include <utils/Log.h>
     20 
     21 #include "Caches.h"
     22 #include "Debug.h"
     23 #include "Extensions.h"
     24 #include "PixelBuffer.h"
     25 #include "Properties.h"
     26 
     27 namespace android {
     28 namespace uirenderer {
     29 
     30 ///////////////////////////////////////////////////////////////////////////////
     31 // CPU pixel buffer
     32 ///////////////////////////////////////////////////////////////////////////////
     33 
     34 class CpuPixelBuffer: public PixelBuffer {
     35 public:
     36     CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
     37     ~CpuPixelBuffer();
     38 
     39     uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
     40     void unmap();
     41 
     42     uint8_t* getMappedPointer() const;
     43 
     44     void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
     45 
     46 private:
     47     uint8_t* mBuffer;
     48 };
     49 
     50 CpuPixelBuffer::CpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
     51         PixelBuffer(format, width, height) {
     52     mBuffer = new uint8_t[width * height * formatSize(format)];
     53 }
     54 
     55 CpuPixelBuffer::~CpuPixelBuffer() {
     56     delete[] mBuffer;
     57 }
     58 
     59 uint8_t* CpuPixelBuffer::map(AccessMode mode) {
     60     if (mAccessMode == kAccessMode_None) {
     61         mAccessMode = mode;
     62     }
     63     return mBuffer;
     64 }
     65 
     66 void CpuPixelBuffer::unmap() {
     67     mAccessMode = kAccessMode_None;
     68 }
     69 
     70 uint8_t* CpuPixelBuffer::getMappedPointer() const {
     71     return mAccessMode == kAccessMode_None ? NULL : mBuffer;
     72 }
     73 
     74 void CpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
     75     glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height,
     76             mFormat, GL_UNSIGNED_BYTE, mBuffer + offset);
     77 }
     78 
     79 ///////////////////////////////////////////////////////////////////////////////
     80 // GPU pixel buffer
     81 ///////////////////////////////////////////////////////////////////////////////
     82 
     83 class GpuPixelBuffer: public PixelBuffer {
     84 public:
     85     GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height);
     86     ~GpuPixelBuffer();
     87 
     88     uint8_t* map(AccessMode mode = kAccessMode_ReadWrite);
     89     void unmap();
     90 
     91     uint8_t* getMappedPointer() const;
     92 
     93     void upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset);
     94 
     95 private:
     96     GLuint mBuffer;
     97     uint8_t* mMappedPointer;
     98     Caches& mCaches;
     99 };
    100 
    101 GpuPixelBuffer::GpuPixelBuffer(GLenum format, uint32_t width, uint32_t height):
    102         PixelBuffer(format, width, height), mMappedPointer(0), mCaches(Caches::getInstance()) {
    103     glGenBuffers(1, &mBuffer);
    104     mCaches.bindPixelBuffer(mBuffer);
    105     glBufferData(GL_PIXEL_UNPACK_BUFFER, getSize(), NULL, GL_DYNAMIC_DRAW);
    106     mCaches.unbindPixelBuffer();
    107 }
    108 
    109 GpuPixelBuffer::~GpuPixelBuffer() {
    110     glDeleteBuffers(1, &mBuffer);
    111 }
    112 
    113 uint8_t* GpuPixelBuffer::map(AccessMode mode) {
    114     if (mAccessMode == kAccessMode_None) {
    115         mCaches.bindPixelBuffer(mBuffer);
    116         mMappedPointer = (uint8_t*) glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, getSize(), mode);
    117 #if DEBUG_OPENGL
    118         if (!mMappedPointer) {
    119             GLenum status = GL_NO_ERROR;
    120             while ((status = glGetError()) != GL_NO_ERROR) {
    121                 ALOGE("Could not map GPU pixel buffer: 0x%x", status);
    122             }
    123         }
    124 #endif
    125         mAccessMode = mode;
    126     }
    127 
    128     return mMappedPointer;
    129 }
    130 
    131 void GpuPixelBuffer::unmap() {
    132     if (mAccessMode != kAccessMode_None) {
    133         if (mMappedPointer) {
    134             mCaches.bindPixelBuffer(mBuffer);
    135             GLboolean status = glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
    136             if (status == GL_FALSE) {
    137                 ALOGE("Corrupted GPU pixel buffer");
    138             }
    139         }
    140         mAccessMode = kAccessMode_None;
    141         mMappedPointer = NULL;
    142     }
    143 }
    144 
    145 uint8_t* GpuPixelBuffer::getMappedPointer() const {
    146     return mMappedPointer;
    147 }
    148 
    149 void GpuPixelBuffer::upload(uint32_t x, uint32_t y, uint32_t width, uint32_t height, int offset) {
    150     // If the buffer is not mapped, unmap() will not bind it
    151     mCaches.bindPixelBuffer(mBuffer);
    152     unmap();
    153     glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, mFormat,
    154             GL_UNSIGNED_BYTE, (void*) offset);
    155 }
    156 
    157 ///////////////////////////////////////////////////////////////////////////////
    158 // Factory
    159 ///////////////////////////////////////////////////////////////////////////////
    160 
    161 PixelBuffer* PixelBuffer::create(GLenum format, uint32_t width, uint32_t height, BufferType type) {
    162     if (type == kBufferType_Auto && Caches::getInstance().gpuPixelBuffersEnabled) {
    163         return new GpuPixelBuffer(format, width, height);
    164     }
    165     return new CpuPixelBuffer(format, width, height);
    166 }
    167 
    168 }; // namespace uirenderer
    169 }; // namespace android
    170