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GPU: Clamp UVs to active rect when presenting

This commit is contained in:
Stenzek 2023-09-02 19:22:29 +10:00
parent 4588f9ee9f
commit 9e8ff3969e
3 changed files with 31 additions and 16 deletions
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26
src/core/gpu.cpp
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@ -1571,11 +1571,14 @@ bool GPU::CompileDisplayPipeline()
fs = shadergen.GenerateDisplaySharpBilinearFragmentShader();
break;
case DisplayScalingMode::Nearest:
case DisplayScalingMode::BilinearSmooth:
fs = shadergen.GenerateDisplayFragmentShader(true);
break;
case DisplayScalingMode::Nearest:
case DisplayScalingMode::NearestInteger:
default:
fs = shadergen.GenerateDisplayFragmentShader();
fs = shadergen.GenerateDisplayFragmentShader(false);
break;
}
@ -1659,6 +1662,7 @@ bool GPU::RenderDisplay(GPUFramebuffer* target, const Common::Rectangle<s32>& dr
{
float src_rect[4];
float src_size[4];
float clamp_rect[4];
float params[4];
} uniforms;
std::memset(uniforms.params, 0, sizeof(uniforms.params));
@ -1718,14 +1722,20 @@ bool GPU::RenderDisplay(GPUFramebuffer* target, const Common::Rectangle<s32>& dr
g_gpu_device->SetTextureSampler(
0, m_display_texture, texture_filter_linear ? g_gpu_device->GetLinearSampler() : g_gpu_device->GetNearestSampler());
const float position_adjust = bilinear_adjust ? 0.5f : 0.0f;
const float size_adjust = bilinear_adjust ? 1.0f : 0.0f;
// For bilinear, clamp to 0.5/SIZE-0.5 to avoid bleeding from the adjacent texels in VRAM. This is because
// 1.0 in UV space is not the bottom-right texel, but a mix of the bottom-right and wrapped/next texel.
const float rcp_width = 1.0f / static_cast<float>(m_display_texture->GetWidth());
const float rcp_height = 1.0f / static_cast<float>(m_display_texture->GetHeight());
uniforms.src_rect[0] = (static_cast<float>(m_display_texture_view_x) + position_adjust) * rcp_width;
uniforms.src_rect[1] = (static_cast<float>(m_display_texture_view_y) + position_adjust) * rcp_height;
uniforms.src_rect[2] = (static_cast<float>(m_display_texture_view_width) - size_adjust) * rcp_width;
uniforms.src_rect[3] = (static_cast<float>(m_display_texture_view_height) - size_adjust) * rcp_height;
uniforms.src_rect[0] = static_cast<float>(m_display_texture_view_x) * rcp_width;
uniforms.src_rect[1] = static_cast<float>(m_display_texture_view_y) * rcp_height;
uniforms.src_rect[2] = static_cast<float>(m_display_texture_view_width) * rcp_width;
uniforms.src_rect[3] = static_cast<float>(m_display_texture_view_height) * rcp_height;
uniforms.clamp_rect[0] = (static_cast<float>(m_display_texture_view_x) + 0.5f) * rcp_width;
uniforms.clamp_rect[1] = (static_cast<float>(m_display_texture_view_y) + 0.5f) * rcp_height;
uniforms.clamp_rect[2] =
(static_cast<float>(m_display_texture_view_x + m_display_texture_view_width) - 0.5f) * rcp_width;
uniforms.clamp_rect[3] =
(static_cast<float>(m_display_texture_view_y + m_display_texture_view_height) - 0.5f) * rcp_height;
uniforms.src_size[0] = static_cast<float>(m_display_texture->GetWidth());
uniforms.src_size[1] = static_cast<float>(m_display_texture->GetHeight());
uniforms.src_size[2] = rcp_width;

19
src/core/gpu_shadergen.cpp
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@ -12,7 +12,12 @@ GPUShaderGen::~GPUShaderGen() = default;
void GPUShaderGen::WriteDisplayUniformBuffer(std::stringstream& ss)
{
DeclareUniformBuffer(ss, {"float4 u_src_rect", "float4 u_src_size", "float4 u_params"}, true);
DeclareUniformBuffer(ss, {"float4 u_src_rect", "float4 u_src_size", "float4 u_clamp_rect", "float4 u_params"}, true);
ss << R"(
float2 ClampUV(float2 uv) {
return clamp(uv, u_clamp_rect.xy, u_clamp_rect.zw);
})";
}
std::string GPUShaderGen::GenerateDisplayVertexShader()
@ -35,17 +40,17 @@ std::string GPUShaderGen::GenerateDisplayVertexShader()
return ss.str();
}
std::string GPUShaderGen::GenerateDisplayFragmentShader()
std::string GPUShaderGen::GenerateDisplayFragmentShader(bool clamp_uv)
{
std::stringstream ss;
WriteHeader(ss);
WriteDisplayUniformBuffer(ss);
DeclareTexture(ss, "samp0", 0);
DeclareFragmentEntryPoint(ss, 0, 1, {}, false, 1);
ss << R"(
{
o_col0 = float4(SAMPLE_TEXTURE(samp0, v_tex0).rgb, 1.0f);
})";
if (clamp_uv)
ss << "{\n o_col0 = float4(SAMPLE_TEXTURE(samp0, ClampUV(v_tex0)).rgb, 1.0f);\n }";
else
ss << "{\n o_col0 = float4(SAMPLE_TEXTURE(samp0, v_tex0).rgb, 1.0f);\n }";
return ss.str();
}
@ -72,7 +77,7 @@ std::string GPUShaderGen::GenerateDisplaySharpBilinearFragmentShader()
float2 f = (center_dist - clamp(center_dist, -region_range, region_range)) * scale + 0.5;
float2 mod_texel = texel_floored + f;
o_col0 = float4(SAMPLE_TEXTURE(samp0, mod_texel * u_src_size.zw).rgb, 1.0f);
o_col0 = float4(SAMPLE_TEXTURE(samp0, ClampUV(mod_texel * u_src_size.zw)).rgb, 1.0f);
})";
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();
std::string GenerateDisplayFragmentShader(bool clamp_uv);
std::string GenerateDisplaySharpBilinearFragmentShader();
private: