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GPU: Work around nearest sampling issues on AMD 

Fixes one-line flickering display in some games.
This commit is contained in:
Stenzek 2024-10-26 01:39:02 +10:00
parent d8cd32d964
commit 6af71beed5
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3 changed files with 16 additions and 6 deletions
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4
src/core/gpu.cpp
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@ -1683,13 +1683,13 @@ bool GPU::CompileDisplayPipelines(bool display, bool deinterlace, bool chroma_sm
case DisplayScalingMode::BilinearSmooth:
case DisplayScalingMode::BilinearInteger:
fs = shadergen.GenerateDisplayFragmentShader(true);
fs = shadergen.GenerateDisplayFragmentShader(true, false);
break;
case DisplayScalingMode::Nearest:
case DisplayScalingMode::NearestInteger:
default:
fs = shadergen.GenerateDisplayFragmentShader(false);
fs = shadergen.GenerateDisplayFragmentShader(false, true);
break;
}

16
src/core/gpu_shadergen.cpp
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@ -48,17 +48,27 @@ std::string GPUShaderGen::GenerateDisplayVertexShader()
return ss.str();
}
std::string GPUShaderGen::GenerateDisplayFragmentShader(bool clamp_uv)
std::string GPUShaderGen::GenerateDisplayFragmentShader(bool clamp_uv, bool nearest)
{
std::stringstream ss;
WriteHeader(ss);
WriteDisplayUniformBuffer(ss);
DeclareTexture(ss, "samp0", 0);
DeclareFragmentEntryPoint(ss, 0, 1);
ss << "{\n";
if (clamp_uv)
ss << "{\n o_col0 = float4(SAMPLE_TEXTURE(samp0, ClampUV(v_tex0)).rgb, 1.0f);\n }";
ss << " float2 uv = ClampUV(v_tex0);\n";
else
ss << "{\n o_col0 = float4(SAMPLE_TEXTURE(samp0, v_tex0).rgb, 1.0f);\n }";
ss << " float2 uv = v_tex0;\n";
// Work around nearest sampling precision issues on AMD graphics cards by adding 1/128 to UVs.
if (nearest)
ss << " o_col0 = float4(LOAD_TEXTURE(samp0, int2((uv * u_src_size.xy) + (1.0 / 128.0)), 0).rgb, 1.0f);\n";
else
ss << " o_col0 = float4(SAMPLE_TEXTURE(samp0, ClampUV(v_tex0)).rgb, 1.0f);\n";
ss << "}\n";
return ss.str();
}

2
src/core/gpu_shadergen.h
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@ -12,7 +12,7 @@ public:
~GPUShaderGen();
std::string GenerateDisplayVertexShader();
std::string GenerateDisplayFragmentShader(bool clamp_uv);
std::string GenerateDisplayFragmentShader(bool clamp_uv, bool nearest);
std::string GenerateDisplaySharpBilinearFragmentShader();
std::string GenerateInterleavedFieldExtractFragmentShader();