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GPU: When calculating the VRAM pixel location using MMU_gpu_map(), replace division and mod instructions with bitshift and bitwise AND instructions. Should help older compilers that don't know how to optimize the division/mod instructions into bitshift/bitwise AND instructions.

This commit is contained in:
rogerman 2017-08-21 08:23:12 -07:00
parent f02210bfdb
commit da6c79c6bd
1 changed files with 10 additions and 14 deletions
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24
desmume/src/GPU.cpp
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@ -3587,9 +3587,8 @@ void GPUEngineBase::_RenderLine_BGExtended(GPUEngineCompositorInfo &compInfo, co
if (vramPixel < (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES * 4))
{
const size_t blockID = vramPixel / (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockPixel = vramPixel % (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockLine = blockPixel / GPU_FRAMEBUFFER_NATIVE_WIDTH;
const size_t blockID = vramPixel >> 16;
const size_t blockLine = (vramPixel >> 8) & 0x000000FF;
GPU->GetEngineMain()->VerifyVRAMLineDidChange(blockID, compInfo.line.indexNative + blockLine);
outUseCustomVRAM = !GPU->GetEngineMain()->isLineCaptureNative[blockID][compInfo.line.indexNative + blockLine];
@ -4164,10 +4163,9 @@ void GPUEngineBase::_SpriteRenderPerform(GPUEngineCompositorInfo &compInfo, u16
const size_t vramPixel = (size_t)((u8 *)MMU_gpu_map(objAddress) - MMU.ARM9_LCD) / sizeof(u16);
if (vramPixel < (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES * 4))
{
const size_t blockID = vramPixel / (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockPixel = vramPixel % (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockLine = blockPixel / GPU_FRAMEBUFFER_NATIVE_WIDTH;
const size_t linePixel = blockPixel % GPU_FRAMEBUFFER_NATIVE_WIDTH;
const size_t blockID = vramPixel >> 16;
const size_t blockLine = (vramPixel >> 8) & 0x000000FF;
const size_t linePixel = vramPixel & 0x000000FF;
if (!GPU->GetEngineMain()->isLineCaptureNative[blockID][blockLine] && (linePixel == 0))
{
@ -4379,9 +4377,8 @@ void GPUEngineBase::_RenderLine_LayerOBJ(GPUEngineCompositorInfo &compInfo, item
if (vramPixel < (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES * 4))
{
const size_t blockID = vramPixel / (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockPixel = vramPixel % (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockLine = blockPixel / GPU_FRAMEBUFFER_NATIVE_WIDTH;
const size_t blockID = vramPixel >> 16;
const size_t blockLine = (vramPixel >> 8) & 0x000000FF;
GPU->GetEngineMain()->VerifyVRAMLineDidChange(blockID, blockLine);
useCustomVRAM = !GPU->GetEngineMain()->isLineCaptureNative[blockID][blockLine];
@ -7915,10 +7912,9 @@ void* GPUSubsystem::GetCustomVRAMAddressUsingMappedAddress(const u32 mappedAddr,
return this->_customVRAMBlank;
}
const size_t blockID = vramPixel / (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockPixel = vramPixel % (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES);
const size_t blockLine = blockPixel / GPU_FRAMEBUFFER_NATIVE_WIDTH;
const size_t linePixel = blockPixel % GPU_FRAMEBUFFER_NATIVE_WIDTH;
const size_t blockID = vramPixel >> 16; // blockID = vramPixel / (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES)
const size_t blockLine = (vramPixel >> 8) & 0x000000FF; // blockLine = (vramPixel % (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES)) / GPU_FRAMEBUFFER_NATIVE_WIDTH
const size_t linePixel = vramPixel & 0x000000FF; // linePixel = (vramPixel % (GPU_FRAMEBUFFER_NATIVE_WIDTH * GPU_VRAM_BLOCK_LINES)) % GPU_FRAMEBUFFER_NATIVE_WIDTH
return (COLORFORMAT == NDSColorFormat_BGR888_Rev) ? (void *)((FragmentColor *)this->GetEngineMain()->GetCustomVRAMBlockPtr(blockID) + (_gpuCaptureLineIndex[blockLine] * this->_displayInfo.customWidth) + _gpuDstPitchIndex[linePixel] + offset) : (void *)((u16 *)this->GetEngineMain()->GetCustomVRAMBlockPtr(blockID) + (_gpuCaptureLineIndex[blockLine] * this->_displayInfo.customWidth) + _gpuDstPitchIndex[linePixel] + offset);
}