From e71f6aa80a4d0c01f2ce71850103f9c20bed0bfc Mon Sep 17 00:00:00 2001 From: Connor McLaughlin Date: Sat, 26 Dec 2020 15:53:19 +1000 Subject: [PATCH] GPU/HW: Improve round-trip accuracy of RGBA5551->RGBA8 Fixes smudging in some games with true colour rendering enabled. --- src/core/gpu_hw_shadergen.cpp | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/src/core/gpu_hw_shadergen.cpp b/src/core/gpu_hw_shadergen.cpp index 808191e5e..7152ef118 100644 --- a/src/core/gpu_hw_shadergen.cpp +++ b/src/core/gpu_hw_shadergen.cpp @@ -47,9 +47,9 @@ uint fixYCoord(uint y) uint RGBA8ToRGBA5551(float4 v) { - uint r = uint(roundEven(v.r * 255.0)) >> 3; - uint g = uint(roundEven(v.g * 255.0)) >> 3; - uint b = uint(roundEven(v.b * 255.0)) >> 3; + uint r = uint(roundEven(v.r * 31.0)); + uint g = uint(roundEven(v.g * 31.0)); + uint b = uint(roundEven(v.b * 31.0)); uint a = (v.a != 0.0) ? 1u : 0u; return (r) | (g << 5) | (b << 10) | (a << 15); } @@ -61,12 +61,7 @@ float4 RGBA5551ToRGBA8(uint v) uint b = ((v >> 10) & 31u); uint a = ((v >> 15) & 1u); - // repeat lower bits - 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)); + return float4(float(r) / 31.0, float(g) / 31.0, float(b) / 31.0, float(a)); } )"; }