mirror of
https://github.com/hrydgard/ppsspp.git
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99 lines
3.6 KiB
GLSL
99 lines
3.6 KiB
GLSL
// MIT License
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//
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// Copyright (c) 2021 Advanced Micro Devices, Inc. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifdef GL_ES
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precision mediump float;
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precision mediump int;
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#endif
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// ------------------------------------------------------------------
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// Texture & uniforms
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// ------------------------------------------------------------------
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#ifdef SHADER_API_D3D11
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uniform sampler2D sampler0 : register(s0);
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#else
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uniform sampler2D sampler0;
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#endif
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uniform vec2 u_texelDelta; // 1.0 / viewportSize
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uniform vec4 u_setting; // x = user sharpness (0…1)
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varying vec2 v_texcoord0;
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// ------------------------------------------------------------------
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// Constants
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// ------------------------------------------------------------------
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const vec3 lumCoef = vec3(0.2126, 0.7152, 0.0722); // Rec.709
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const float rcasPeak = 8.0 - 3.0; // = 5.0
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const float rcasInvP = 1.0 / rcasPeak;
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const float FSR_EPS = 0.0001;
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// Offsets for 4-tap cross pattern
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const vec2 offN = vec2( 0.0,-1.0);
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const vec2 offW = vec2(-1.0, 0.0);
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const vec2 offE = vec2( 1.0, 0.0);
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const vec2 offS = vec2( 0.0, 1.0);
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// ------------------------------------------------------------------
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// RCAS kernel – unchanged logic
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// ------------------------------------------------------------------
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vec4 FsrRcasVanilla(vec2 uv)
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{
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vec3 C = texture2D(sampler0, uv).rgb;
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float CL = dot(C, lumCoef);
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vec3 N = texture2D(sampler0, uv + offN * u_texelDelta).rgb;
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vec3 W = texture2D(sampler0, uv + offW * u_texelDelta).rgb;
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vec3 E = texture2D(sampler0, uv + offE * u_texelDelta).rgb;
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vec3 S = texture2D(sampler0, uv + offS * u_texelDelta).rgb;
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float NL = dot(N, lumCoef);
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float WL = dot(W, lumCoef);
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float EL = dot(E, lumCoef);
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float SL = dot(S, lumCoef);
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// Adaptive range
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vec3 minRGB = min(min(min(N, W), min(E, S)), C);
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vec3 maxRGB = max(max(max(N, W), max(E, S)), C);
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vec3 invMax = 1.0 / (maxRGB + FSR_EPS);
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vec3 amp = clamp(min(minRGB, 2.0 - maxRGB) * invMax, 0.0, 1.0);
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amp = inversesqrt(amp + FSR_EPS);
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float w = -rcasInvP / dot(amp, lumCoef);
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float sumL = NL + WL + EL + SL;
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float invDen = 1.0 / (4.0 * w + 1.0);
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float sharpL = clamp((sumL * w + CL) * invDen, 0.0, 1.0);
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vec3 chroma = C - vec3(CL);
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vec3 sharpColor = chroma + vec3(sharpL);
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vec3 outColor = mix(C, sharpColor, u_setting.x);
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return vec4(outColor, 1.0);
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}
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// ------------------------------------------------------------------
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void main()
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{
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gl_FragColor = FsrRcasVanilla(v_texcoord0);
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}
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