mirror of
https://github.com/Kelsidavis/WoWee.git
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ebaf95cc42
FSR EASU and FSR2 sharpen fragment shaders had a manual Y-flip to undo the now-removed postprocess.vert flip. Strip those since the vertex shader no longer flips, making all postprocess paths consistent. Also flip the default mouse Y-axis to match user expectation (mouse down = look up / flight-sim style) and make FSR1 disable MSAA on enable, matching FSR2 behaviour (FSR provides its own spatial AA).
52 lines
2 KiB
GLSL
52 lines
2 KiB
GLSL
#version 450
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layout(location = 0) in vec2 TexCoord;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 0) uniform sampler2D inputImage;
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layout(push_constant) uniform PushConstants {
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vec4 params; // x = 1/width, y = 1/height, z = sharpness (0-2), w = unused
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} pc;
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void main() {
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vec2 tc = TexCoord;
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vec2 texelSize = pc.params.xy;
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float sharpness = pc.params.z;
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// RCAS: Robust Contrast-Adaptive Sharpening
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// 5-tap cross pattern
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vec3 center = texture(inputImage, tc).rgb;
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vec3 north = texture(inputImage, tc + vec2(0.0, -texelSize.y)).rgb;
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vec3 south = texture(inputImage, tc + vec2(0.0, texelSize.y)).rgb;
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vec3 west = texture(inputImage, tc + vec2(-texelSize.x, 0.0)).rgb;
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vec3 east = texture(inputImage, tc + vec2( texelSize.x, 0.0)).rgb;
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// Compute local contrast (min/max of neighborhood)
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vec3 minRGB = min(center, min(min(north, south), min(west, east)));
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vec3 maxRGB = max(center, max(max(north, south), max(west, east)));
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// Adaptive sharpening weight based on local contrast
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// High contrast = less sharpening (prevent ringing)
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vec3 range = maxRGB - minRGB;
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vec3 rcpRange = 1.0 / (range + 0.001);
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// AMD FidelityFX RCAS-style weight computation:
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// Compute per-channel sharpening weight from local contrast
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vec3 rcpM = 1.0 / (4.0 * range + 0.001);
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// Weight capped at sharpness, inversely proportional to contrast
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float w = min(min(rcpM.r, min(rcpM.g, rcpM.b)), sharpness);
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// Apply sharpening: negative lobe on neighbors
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vec3 sharpened = (center * (1.0 + 4.0 * w) - (north + south + west + east) * w)
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/ (1.0 + 4.0 * w - 4.0 * w);
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// Simplified: center + w * (4*center - north - south - west - east)
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sharpened = center + w * (4.0 * center - north - south - west - east);
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// Soft clamp: allow some overshoot for sharpness, prevent extreme ringing
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vec3 overshoot = 0.1 * (maxRGB - minRGB);
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sharpened = clamp(sharpened, minRGB - overshoot, maxRGB + overshoot);
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FragColor = vec4(sharpened, 1.0);
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}
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