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Diffstat (limited to '')
-rw-r--r-- | src/video_core/host_shaders/fxaa.frag | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/video_core/host_shaders/fxaa.frag b/src/video_core/host_shaders/fxaa.frag new file mode 100644 index 000000000..02f4068d1 --- /dev/null +++ b/src/video_core/host_shaders/fxaa.frag @@ -0,0 +1,76 @@ +// Copyright 2021 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +// Source code is adapted from +// https://www.geeks3d.com/20110405/fxaa-fast-approximate-anti-aliasing-demo-glsl-opengl-test-radeon-geforce/3/ + +#version 460 + +#ifdef VULKAN + +#define BINDING_COLOR_TEXTURE 1 + +#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv + +#define BINDING_COLOR_TEXTURE 0 + +#endif + +layout (location = 0) in vec4 posPos; + +layout (location = 0) out vec4 frag_color; + +layout (binding = BINDING_COLOR_TEXTURE) uniform sampler2D input_texture; + +const float FXAA_SPAN_MAX = 8.0; +const float FXAA_REDUCE_MUL = 1.0 / 8.0; +const float FXAA_REDUCE_MIN = 1.0 / 128.0; + +#define FxaaTexLod0(t, p) textureLod(t, p, 0.0) +#define FxaaTexOff(t, p, o) textureLodOffset(t, p, 0.0, o) + +vec3 FxaaPixelShader(vec4 posPos, sampler2D tex) { + + vec3 rgbNW = FxaaTexLod0(tex, posPos.zw).xyz; + vec3 rgbNE = FxaaTexOff(tex, posPos.zw, ivec2(1,0)).xyz; + vec3 rgbSW = FxaaTexOff(tex, posPos.zw, ivec2(0,1)).xyz; + vec3 rgbSE = FxaaTexOff(tex, posPos.zw, ivec2(1,1)).xyz; + vec3 rgbM = FxaaTexLod0(tex, posPos.xy).xyz; +/*---------------------------------------------------------*/ + vec3 luma = vec3(0.299, 0.587, 0.114); + float lumaNW = dot(rgbNW, luma); + float lumaNE = dot(rgbNE, luma); + float lumaSW = dot(rgbSW, luma); + float lumaSE = dot(rgbSE, luma); + float lumaM = dot(rgbM, luma); +/*---------------------------------------------------------*/ + float lumaMin = min(lumaM, min(min(lumaNW, lumaNE), min(lumaSW, lumaSE))); + float lumaMax = max(lumaM, max(max(lumaNW, lumaNE), max(lumaSW, lumaSE))); +/*---------------------------------------------------------*/ + vec2 dir; + dir.x = -((lumaNW + lumaNE) - (lumaSW + lumaSE)); + dir.y = ((lumaNW + lumaSW) - (lumaNE + lumaSE)); +/*---------------------------------------------------------*/ + float dirReduce = max( + (lumaNW + lumaNE + lumaSW + lumaSE) * (0.25 * FXAA_REDUCE_MUL), + FXAA_REDUCE_MIN); + float rcpDirMin = 1.0/(min(abs(dir.x), abs(dir.y)) + dirReduce); + dir = min(vec2( FXAA_SPAN_MAX, FXAA_SPAN_MAX), + max(vec2(-FXAA_SPAN_MAX, -FXAA_SPAN_MAX), + dir * rcpDirMin)) / textureSize(tex, 0); +/*--------------------------------------------------------*/ + vec3 rgbA = (1.0 / 2.0) * ( + FxaaTexLod0(tex, posPos.xy + dir * (1.0 / 3.0 - 0.5)).xyz + + FxaaTexLod0(tex, posPos.xy + dir * (2.0 / 3.0 - 0.5)).xyz); + vec3 rgbB = rgbA * (1.0 / 2.0) + (1.0 / 4.0) * ( + FxaaTexLod0(tex, posPos.xy + dir * (0.0 / 3.0 - 0.5)).xyz + + FxaaTexLod0(tex, posPos.xy + dir * (3.0 / 3.0 - 0.5)).xyz); + float lumaB = dot(rgbB, luma); + if((lumaB < lumaMin) || (lumaB > lumaMax)) return rgbA; + return rgbB; +} + +void main() { + frag_color = vec4(FxaaPixelShader(posPos, input_texture), 1.0); +} |