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GPU: Fix incorrect handling of check mask bit

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Fixes boxes in Silent Hill in Software Renderer.
This commit is contained in:
Connor McLaughlin 2020-03-06 00:29:35 +10:00
parent d46d681179
commit f9a298f1b7
3 changed files with 14 additions and 6 deletions
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4
src/core/gpu.cpp
View file

@ -870,7 +870,7 @@ void GPU::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data)
{
// TODO: Handle unaligned reads...
u16* pixel_ptr = &dst_row_ptr[(x + col++) % VRAM_WIDTH];
if (((*pixel_ptr) & mask_and) == mask_and)
if (((*pixel_ptr) & mask_and) == 0)
*pixel_ptr = *(src_ptr++) | mask_or;
}
}
@ -892,7 +892,7 @@ void GPU::CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 he
{
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)
if ((*dst_pixel_ptr & mask_and) == 0)
*dst_pixel_ptr = src_pixel | mask_or;
}
}

14
src/core/gpu.h
View file

@ -390,9 +390,17 @@ protected:
return ((bits & MASK) == MASK);
}
// During transfer/render operations, if ((dst_pixel & mask_and) == mask_and) { pixel = src_pixel | mask_or }
u16 GetMaskAND() const { return check_mask_before_draw ? 0x8000 : 0x0000; }
u16 GetMaskOR() const { return set_mask_while_drawing ? 0x8000 : 0x0000; }
// During transfer/render operations, if ((dst_pixel & mask_and) == 0) { pixel = src_pixel | mask_or }
u16 GetMaskAND() const
{
// return check_mask_before_draw ? 0x8000 : 0x0000;
return Truncate16((bits << 3) & 0x8000);
}
u16 GetMaskOR() const
{
// return set_mask_while_drawing ? 0x8000 : 0x0000;
return Truncate16((bits << 4) & 0x8000);
}
} m_GPUSTAT = {};
struct DrawMode

2
src/core/gpu_sw.cpp
View file

@ -570,7 +570,7 @@ void GPU_SW::ShadePixel(u32 x, u32 y, u8 color_r, u8 color_g, u8 color_b, u8 tex
}
const u16 mask_and = m_GPUSTAT.GetMaskAND();
if ((bg_color.bits & mask_and) != mask_and)
if ((bg_color.bits & mask_and) != 0)
return;
SetPixel(static_cast<u32>(x), static_cast<u32>(y), color.bits | m_GPUSTAT.GetMaskOR());