Patch_2

leenkx/Shaders/fsr1_rcas_pass/LICENSE.txt

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+https://gpuopen.com/manuals/fidelityfx_sdk/license/
+
+Copyright © 2024 Advanced Micro Devices, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files(the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and /or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

leenkx/Shaders/fsr1_rcas_pass/fsr1_rcas_pass.frag.glsl

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+#version 450
+
+// AMD FidelityFX Super Resolution 1.0.2 - RCAS (Robust Contrast Adaptive Sharpening)
+
+#include "compiled.inc"
+
+uniform sampler2D tex;
+
+// Sharpness in "stops": 0.0 = maximum sharpness, higher = less sharp
+// Converted to linear via exp2(-sharpness)
+#ifdef _FSR1_Ultra_Quality
+const float SHARPNESS_STOPS = 0.0;
+#elif defined(_FSR1_Balanced)
+const float SHARPNESS_STOPS = 1.0;
+#elif defined(_FSR1_Performance)
+const float SHARPNESS_STOPS = 2.0;
+#elif defined(_FSR1_Custom)
+uniform vec4 PPComp15;
+#define SHARPNESS_STOPS (PPComp15.x * 2.0)
+#else
+const float SHARPNESS_STOPS = 0.5; // Quality (default)
+#endif
+
+// FSR RCAS limit - prevents unnatural sharpening artifacts
+#define FSR_RCAS_LIMIT (0.25 - (1.0 / 16.0))
+
+in vec2 texCoord;
+out vec4 fragColor;
+
+// AMD helper functions from ffx_a.h
+float AMin3F1(float x, float y, float z) { return min(x, min(y, z)); }
+float AMax3F1(float x, float y, float z) { return max(x, max(y, z)); }
+
+// High precision reciprocal (required for limiters per AMD docs)
+// Added epsilon to prevent division by zero in dark areas
+float ARcpF1(float a) {
+    return 1.0 / max(a, 1e-8);
+}
+
+// Medium precision reciprocal approximation (from AMD ffx_a.h)
+// Only used for noise detection and final resolve
+float APrxMedRcpF1(float a) {
+    return uintBitsToFloat(uint(0x7ef19fff) - floatBitsToUint(a));
+}
+
+void main() {
+    // Get texture size and texel offset
+    vec2 texSize = vec2(textureSize(tex, 0));
+    vec2 texelSize = 1.0 / texSize;
+    
+    // Algorithm uses minimal 3x3 pixel neighborhood
+    //    b 
+    //  d e f
+    //    h
+    // Clamp inputs to [0,1] - FSR expects sRGB normalized input
+    vec3 b = clamp(texture(tex, texCoord + vec2(0.0, -texelSize.y)).rgb, 0.0, 1.0);
+    vec3 d = clamp(texture(tex, texCoord + vec2(-texelSize.x, 0.0)).rgb, 0.0, 1.0);
+    vec4 ee = texture(tex, texCoord);
+    vec3 e = clamp(ee.rgb, 0.0, 1.0);
+    vec3 f = clamp(texture(tex, texCoord + vec2(texelSize.x, 0.0)).rgb, 0.0, 1.0);
+    vec3 h = clamp(texture(tex, texCoord + vec2(0.0, texelSize.y)).rgb, 0.0, 1.0);
+    
+    // Luma times 2 (AMD's luma calculation: B*0.5 + R*0.5 + G)
+    float bL = b.b * 0.5 + (b.r * 0.5 + b.g);
+    float dL = d.b * 0.5 + (d.r * 0.5 + d.g);
+    float eL = e.b * 0.5 + (e.r * 0.5 + e.g);
+    float fL = f.b * 0.5 + (f.r * 0.5 + f.g);
+    float hL = h.b * 0.5 + (h.r * 0.5 + h.g);
+    
+    // Noise detection (official AMD algorithm with safety for flat areas)
+    float nz = 0.25 * bL + 0.25 * dL + 0.25 * fL + 0.25 * hL - eL;
+    float range = AMax3F1(AMax3F1(bL, dL, eL), fL, hL) - AMin3F1(AMin3F1(bL, dL, eL), fL, hL);
+    // Use safe division instead of APrxMedRcpF1 for range to avoid NaN in flat areas
+    nz = clamp(abs(nz) / max(range, 1e-5), 0.0, 1.0);
+    nz = -0.5 * nz + 1.0;
+    
+    // Min and max of ring (per channel)
+    float mn4R = min(AMin3F1(b.r, d.r, f.r), h.r);
+    float mn4G = min(AMin3F1(b.g, d.g, f.g), h.g);
+    float mn4B = min(AMin3F1(b.b, d.b, f.b), h.b);
+    float mx4R = max(AMax3F1(b.r, d.r, f.r), h.r);
+    float mx4G = max(AMax3F1(b.g, d.g, f.g), h.g);
+    float mx4B = max(AMax3F1(b.b, d.b, f.b), h.b);
+    
+    // Immediate constants for peak range
+    vec2 peakC = vec2(1.0, -4.0);
+    
+    // Limiters - these need HIGH PRECISION reciprocals (per AMD docs)
+    float hitMinR = min(mn4R, e.r) * ARcpF1(4.0 * mx4R);
+    float hitMinG = min(mn4G, e.g) * ARcpF1(4.0 * mx4G);
+    float hitMinB = min(mn4B, e.b) * ARcpF1(4.0 * mx4B);
+    float hitMaxR = (peakC.x - max(mx4R, e.r)) * ARcpF1(4.0 * mn4R + peakC.y);
+    float hitMaxG = (peakC.x - max(mx4G, e.g)) * ARcpF1(4.0 * mn4G + peakC.y);
+    float hitMaxB = (peakC.x - max(mx4B, e.b)) * ARcpF1(4.0 * mn4B + peakC.y);
+    float lobeR = max(-hitMinR, hitMaxR);
+    float lobeG = max(-hitMinG, hitMaxG);
+    float lobeB = max(-hitMinB, hitMaxB);
+    
+    // Apply sharpness (convert from stops to linear)
+    float sharpness = exp2(-SHARPNESS_STOPS);
+    float lobe = max(-FSR_RCAS_LIMIT, min(AMax3F1(lobeR, lobeG, lobeB), 0.0)) * sharpness;
+    
+    // Apply noise removal
+    lobe *= nz;
+    
+    // Resolve using safe reciprocal to avoid any edge case issues
+    float denom = 4.0 * lobe + 1.0;
+    float rcpL = 1.0 / max(denom, 0.25); // denom should be in [0.25, 1.0] range
+    vec3 pix;
+    pix.r = (lobe * b.r + lobe * d.r + lobe * h.r + lobe * f.r + e.r) * rcpL;
+    pix.g = (lobe * b.g + lobe * d.g + lobe * h.g + lobe * f.g + e.g) * rcpL;
+    pix.b = (lobe * b.b + lobe * d.b + lobe * h.b + lobe * f.b + e.b) * rcpL;
+    
+    // Ensure output is clamped to valid range
+    fragColor = vec4(clamp(pix, 0.0, 1.0), ee.a);
+}

leenkx/Shaders/fsr1_rcas_pass/fsr1_rcas_pass.json

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+{
+	"contexts": [
+		{
+			"name": "fsr1_rcas_pass",
+			"depth_write": false,
+			"compare_mode": "always",
+			"cull_mode": "none",
+			"links": [
+				{
+					"name": "screenSize",
+					"link": "_screenSize"
+				},
+				{
+					"name": "PPComp15",
+					"link": "_PPComp15",
+					"ifdef": ["_FSR1_Custom"]
+				}
+			],
+			"texture_params": [],
+			"vertex_shader": "../include/pass.vert.glsl",
+			"fragment_shader": "fsr1_rcas_pass.frag.glsl"
+		}
+	]
+}