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Merge pull request #9781 from Techjar/bbox-round-down

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VideoCommon: Round bounding box coordinates down and remove pixel center offset
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JMC47 2021-06-05 05:03:32 -04:00 committed by GitHub
commit 36871c9329
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1 changed files with 1 additions and 11 deletions
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12
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -495,19 +495,9 @@ void UpdateBoundingBoxBuffer(int2 min_pos, int2 max_pos) {{
}}
void UpdateBoundingBox(float2 rawpos) {{
// The pixel center in the GameCube GPU is 7/12, not 0.5 (see VertexShaderGen.cpp)
// Adjust for this by unapplying the offset we added in the vertex shader.
const float PIXEL_CENTER_OFFSET = 7.0 / 12.0 - 0.5;
float2 offset = float2(PIXEL_CENTER_OFFSET, -PIXEL_CENTER_OFFSET);
#ifdef API_OPENGL
// OpenGL lower-left origin means that Y goes in the opposite direction.
offset.y = -offset.y;
#endif
// The rightmost shaded pixel is not included in the right bounding box register,
// such that width = right - left + 1. This has been verified on hardware.
int2 pos = iround(rawpos * cefbscale + offset);
int2 pos = int2(rawpos * cefbscale);
// The GC/Wii GPU rasterizes in 2x2 pixel groups, so bounding box values will be rounded to the
// extents of these groups, rather than the exact pixel.