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GPU/HW: Improve round-trip accuracy of RGBA5551->RGBA8 

Fixes smudging in some games with true colour rendering enabled.
This commit is contained in:
Connor McLaughlin 2020-12-26 15:53:19 +10:00
parent 5451a1f5c3
commit e71f6aa80a
1 changed files with 4 additions and 9 deletions
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13
src/core/gpu_hw_shadergen.cpp
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@ -47,9 +47,9 @@ uint fixYCoord(uint y)
uint RGBA8ToRGBA5551(float4 v) uint RGBA8ToRGBA5551(float4 v)
{ {
uint r = uint(roundEven(v.r * 255.0)) >> 3; uint r = uint(roundEven(v.r * 31.0));
uint g = uint(roundEven(v.g * 255.0)) >> 3; uint g = uint(roundEven(v.g * 31.0));
uint b = uint(roundEven(v.b * 255.0)) >> 3; uint b = uint(roundEven(v.b * 31.0));
uint a = (v.a != 0.0) ? 1u : 0u; uint a = (v.a != 0.0) ? 1u : 0u;
return (r) | (g << 5) | (b << 10) | (a << 15); return (r) | (g << 5) | (b << 10) | (a << 15);
} }
@ -61,12 +61,7 @@ float4 RGBA5551ToRGBA8(uint v)
uint b = ((v >> 10) & 31u); uint b = ((v >> 10) & 31u);
uint a = ((v >> 15) & 1u); uint a = ((v >> 15) & 1u);
// repeat lower bits return float4(float(r) / 31.0, float(g) / 31.0, float(b) / 31.0, float(a));
r = (r << 3) | (r & 7u);
g = (g << 3) | (g & 7u);
b = (b << 3) | (b & 7u);
return float4(float(r) / 255.0, float(g) / 255.0, float(b) / 255.0, float(a));
} }
)"; )";
} }