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Maintain the PICA's 8 bits of color precision when using the interpolated primary color

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This matches the software renderer by using round.
The actual hardware rounds the results up instead of flooring.
This commit is contained in:
Dwayne Slater 2017-11-29 16:49:04 -05:00
parent 350082ab75
commit fcc141a327
1 changed files with 4 additions and 1 deletions
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5
src/video_core/renderer_opengl/gl_shader_gen.cpp
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@ -234,7 +234,7 @@ static void AppendSource(std::string& out, const PicaShaderConfig& config,
using Source = TevStageConfig::Source;
switch (source) {
case Source::PrimaryColor:
out += "primary_color";
out += "rounded_primary_color";
break;
case Source::PrimaryFragmentColor:
out += "primary_fragment_color";
@ -1100,8 +1100,11 @@ float LookupLightingLUTSigned(int lut_index, float pos) {
if (config.state.proctex.enable)
AppendProcTexSampler(out, config);
// We round the interpolated primary color to the nearest 1/255th
// This maintains the PICA's 8 bits of precision
out += R"(
void main() {
vec4 rounded_primary_color = round(primary_color * 255.0) / 255.0;
vec4 primary_fragment_color = vec4(0.0);
vec4 secondary_fragment_color = vec4(0.0);
)";