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desmume
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major speedup to 3d by using a different pixel format for retrieving opengl framebuffer!

This commit is contained in:
zeromus 2008-12-28 23:22:35 +00:00
parent 008523a5ff
commit e407e945a5
1 changed files with 7 additions and 8 deletions
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15
desmume/src/OGLRender.cpp
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@ -1194,15 +1194,14 @@ static void GL_ReadFramebuffer()
{
if(!BEGINGL()) return;
glFinish();
glReadPixels(0,0,256,192,GL_RGBA, GL_UNSIGNED_BYTE, GPU_screen3D);
glReadPixels(0,0,256,192,GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, GPU_screenStencil);
glReadPixels(0,0,256,192,GL_BGRA_EXT, GL_UNSIGNED_BYTE, GPU_screen3D);
ENDGL();
//convert the pixels to a different format which is more convenient
//is it safe to modify the screen buffer? if not, we could make a temp copy
for(int i=0;i<256*192;i++) {
int t = i<<2;
u32 &u32screen3D = *(u32*)&GPU_screen3D[t];
u32 &u32screen3D = ((u32*)GPU_screen3D)[i];
u32screen3D>>=3;
u32screen3D &= 0x1F1F1F1F;
}
@ -1250,9 +1249,9 @@ static void OGLGetLineCaptured(int line, u16* dst)
}
int t=i<<2;
u32 r = screen3D[t+0];
u32 r = screen3D[t+2];
u32 g = screen3D[t+1];
u32 b = screen3D[t+2];
u32 b = screen3D[t+0];
//if this math strikes you as wrong, be sure to look at GL_ReadFramebuffer() where the pixel format in screen3D is changed
dst[i] = (b<<10) | (g<<5) | (r) | 0x8000;
@ -1268,7 +1267,7 @@ static void OGLGetLine(int line, int start, int end_inclusive, u16* dst)
needRefreshFramebuffer = false;
GL_ReadFramebuffer();
}
u8 *screen3D = (u8*)GPU_screen3D+((191-line)<<10);
u8 *screenStencil = (u8*)GPU_screenStencil+((191-line)<<8);
@ -1307,7 +1306,7 @@ static void OGLGetLine(int line, int start, int end_inclusive, u16* dst)
mixtbl & mix = mixTable555[a];
//r
u32 newpix = screen3D[t+0];
u32 newpix = screen3D[t+2];
u32 oldpix = oldcolor&0x1F;
newpix = mix[newpix][oldpix];
dstpixel = newpix;
@ -1319,7 +1318,7 @@ static void OGLGetLine(int line, int start, int end_inclusive, u16* dst)
dstpixel |= (newpix<<5);
//b
newpix = screen3D[t+2];
newpix = screen3D[t+0];
oldpix = (oldcolor>>10)&0x1F;
newpix = mix[newpix][oldpix];
dstpixel |= (newpix<<10);