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GPU: Implement mask bit handling in software renderer

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Still needs implementation in the hardware renderers.
This commit is contained in:
Connor McLaughlin
2019-11-24 18:47:40 +10:00
parent 6c6bf8714c
commit 9d6d00480c
4 changed files with 55 additions and 16 deletions
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25
src/core/gpu_sw.cpp
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@ -52,11 +52,22 @@ void GPU_SW::FillVRAM(u32 x, u32 y, u32 width, u32 height, u32 color)
void GPU_SW::CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 height)
{
for (u32 yoffs = 0; yoffs < height; yoffs++)
// This doesn't have a fast path, but do we really need one? It's not common.
const u16 mask_and = m_GPUSTAT.GetMaskAND();
const u16 mask_or = m_GPUSTAT.GetMaskOR();
for (u32 row = 0; row < height; row++)
{
const u16* src_ptr = GetPixelPtr(src_x, src_y + yoffs);
u16* dst_ptr = GetPixelPtr(dst_x, dst_y + yoffs);
std::copy_n(src_ptr, width, dst_ptr);
const u16* src_row_ptr = &m_vram_ptr[((src_y + row) % VRAM_HEIGHT) * VRAM_WIDTH];
u16* dst_row_ptr = &m_vram_ptr[((dst_y + row) % VRAM_HEIGHT) * VRAM_WIDTH];
for (u32 col = 0; col < width; col++)
{
const u16 src_pixel = src_row_ptr[(src_x + col) % VRAM_WIDTH];
u16* dst_pixel_ptr = &dst_row_ptr[(dst_x + col) % VRAM_WIDTH];
if ((*dst_pixel_ptr & mask_and) == mask_and)
*dst_pixel_ptr = src_pixel | mask_or;
}
}
}
@ -502,7 +513,11 @@ void GPU_SW::ShadePixel(RenderCommand rc, u32 x, u32 y, u8 color_r, u8 color_g,
#undef BLEND_AVERAGE
}
SetPixel(static_cast<u32>(x), static_cast<u32>(y), color.bits);
const u16 mask_and = m_GPUSTAT.GetMaskAND();
if ((color.bits & mask_and) != mask_and)
return;
SetPixel(static_cast<u32>(x), static_cast<u32>(y), color.bits | m_GPUSTAT.GetMaskOR());
}
std::unique_ptr<GPU> GPU::CreateSoftwareRenderer()