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Optimised EFB copy to RAM.

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The finding was that 99% of the time, textures are static in memory. However, Dolphin would pessimistically continue to decode and copy the same texture every time.  The optimisation is to check if the texture matches what is in the cache, and if it does, Dolphin should early exit.

The result is the speed in New Super Mario Bros Wii increased 35% with spinning coins.  Still not as fast as EFB copy to texture though.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6352 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
skidau
2010-11-06 04:46:44 +00:00
parent d0afc20596
commit 8775abacc6
4 changed files with 33 additions and 4 deletions
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8
Source/Plugins/Plugin_VideoOGL/Src/TextureConverter.cpp
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@ -345,6 +345,12 @@ u64 EncodeToRamFromTexture(u32 address,GLuint source_texture,float MValueX,float
int size_in_bytes = TexDecoder_GetTextureSizeInBytes(width, height, format);
u64 hash = GetHash64(dest_ptr,size_in_bytes,g_ActiveConfig.iSafeTextureCache_ColorSamples);
// If the texture in RAM is already in the texture cache, do not copy it again as it has not changed.
if (TextureCache::Find(address, hash))
return hash;
u16 blkW = TexDecoder_GetBlockWidthInTexels(format) - 1;
u16 blkH = TexDecoder_GetBlockHeightInTexels(format) - 1;
u16 samples = TextureConversionShader::GetEncodedSampleCount(format);
@ -375,7 +381,7 @@ u64 EncodeToRamFromTexture(u32 address,GLuint source_texture,float MValueX,float
int readStride = (expandedWidth * cacheBytes) / TexDecoder_GetBlockWidthInTexels(format);
EncodeToRamUsingShader(texconv_shader, source_texture, scaledSource, dest_ptr, expandedWidth / samples, expandedHeight, readStride, true, bScaleByHalf > 0 && !bFromZBuffer);
TextureCache::MakeRangeDynamic(address,size_in_bytes);
return GetHash64(dest_ptr,size_in_bytes,g_ActiveConfig.iSafeTextureCache_ColorSamples);
return hash;
}
void EncodeToRamYUYV(GLuint srcTexture, const TargetRectangle& sourceRc, u8* destAddr, int dstWidth, int dstHeight)