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- Motion vectors: single unjittered reprojection matrix (80 bytes) instead of two jittered matrices (160 bytes), eliminating numerical instability from jitter amplification through large world coordinates - Sharpen pass: fix Y-flip for correct UV sampling, double-buffer descriptor sets to avoid race with in-flight command buffers - MSAA: auto-disable when FSR2 enabled, grey out AA setting in UI - Accumulation: variance-based neighborhood clamping in YCoCg space, correct history layout transitions - Frame index: wrap at 256 for stable Halton sequence
50 lines
1.9 KiB
GLSL
50 lines
1.9 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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// Undo the vertex shader Y flip (postprocess.vert flips for Vulkan overlay,
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// but we need standard UV coords for texture sampling)
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vec2 tc = vec2(TexCoord.x, 1.0 - TexCoord.y);
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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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// Sharpening amount: inversely proportional to contrast
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float luma = dot(center, vec3(0.299, 0.587, 0.114));
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float lumaRange = max(range.r, max(range.g, range.b));
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float w = clamp(1.0 - lumaRange * 2.0, 0.0, 1.0) * sharpness * 0.25;
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// Apply sharpening via unsharp mask
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vec3 avg = (north + south + west + east) * 0.25;
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vec3 sharpened = center + (center - avg) * w;
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// Clamp to prevent ringing artifacts
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sharpened = clamp(sharpened, minRGB, maxRGB);
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FragColor = vec4(sharpened, 1.0);
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}
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