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Re-implement async color buffer read.

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Color buffer read in async mode is 7 times faster than sync read on my video card.
This commit is contained in:
Sergey Lipskiy 2015-10-03 23:23:18 +06:00
parent 2b942b8d40
commit 23de60b500
1 changed files with 21 additions and 12 deletions
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33
src/FrameBuffer.cpp
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@ -23,8 +23,10 @@ class FrameBufferToRDRAM
{
public:
FrameBufferToRDRAM() :
m_FBO(0), m_PBO(0), m_pTexture(NULL)
{}
m_bSync(true), m_FBO(0), m_pTexture(NULL), m_curIndex(0)
{
m_aPBO[0] = m_aPBO[1] = 0;
}
void Init();
void Destroy();
@ -39,9 +41,11 @@ private:
u32 raw;
};
bool m_bSync;
GLuint m_FBO;
GLuint m_PBO;
CachedTexture * m_pTexture;
u32 m_curIndex;
GLuint m_aPBO[2];
};
class DepthBufferToRDRAM
@ -924,10 +928,14 @@ void FrameBufferToRDRAM::Init()
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
// Generate and initialize Pixel Buffer Objects
glGenBuffers(1, &m_PBO);
glBindBuffer(GL_PIXEL_PACK_BUFFER, m_PBO);
glGenBuffers(2, m_aPBO);
glBindBuffer(GL_PIXEL_PACK_BUFFER, m_aPBO[0]);
glBufferData(GL_PIXEL_PACK_BUFFER, m_pTexture->textureBytes, NULL, GL_DYNAMIC_READ);
glBindBuffer(GL_PIXEL_PACK_BUFFER, m_aPBO[1]);
glBufferData(GL_PIXEL_PACK_BUFFER, m_pTexture->textureBytes, NULL, GL_DYNAMIC_READ);
glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
m_bSync = true;
m_curIndex = 0;
}
void FrameBufferToRDRAM::Destroy() {
@ -940,10 +948,8 @@ void FrameBufferToRDRAM::Destroy() {
textureCache().removeFrameBufferTexture(m_pTexture);
m_pTexture = NULL;
}
if (m_PBO != 0) {
glDeleteBuffers(1, &m_PBO);
m_PBO = 0;
}
glDeleteBuffers(2, m_aPBO);
m_aPBO[0] = m_aPBO[1] = 0;
}
void FrameBufferToRDRAM::CopyToRDRAM(u32 _address)
@ -979,14 +985,17 @@ void FrameBufferToRDRAM::CopyToRDRAM(u32 _address)
glBindFramebuffer(GL_READ_FRAMEBUFFER, m_FBO);
glReadBuffer(GL_COLOR_ATTACHMENT0);
#ifndef GLES2
PBOBinder binder(GL_PIXEL_PACK_BUFFER, m_PBO);
// If Sync, read pixels from the buffer, copy them to RDRAM.
// If not Sync, read pixels from the buffer, copy pixels from the previous buffer to RDRAM.
m_curIndex ^= 1;
const u32 nextIndex = m_bSync ? m_curIndex : m_curIndex^1;
glBindBuffer(GL_PIXEL_PACK_BUFFER, m_aPBO[m_curIndex]);
glReadPixels(0, 0, VI.width, VI.height, GL_RGBA, GL_UNSIGNED_BYTE, 0);
PBOBinder binder(GL_PIXEL_PACK_BUFFER, m_aPBO[nextIndex]);
GLubyte* pixelData = (GLubyte*)glMapBufferRange(GL_PIXEL_PACK_BUFFER, 0, numPixels * 4, GL_MAP_READ_BIT);
if(pixelData == NULL)
return;
#else
m_curIndex = 0;
const u32 nextIndex = 0;
GLubyte* pixelData = (GLubyte* )malloc(numPixels * 4);
if(pixelData == NULL)
return;