48 lines
1.5 KiB
GLSL
48 lines
1.5 KiB
GLSL
// Copyright (c) Wojciech Figat. All rights reserved.
|
|
|
|
#include "./Flax/Common.hlsl"
|
|
|
|
META_CB_BEGIN(0, Data)
|
|
float2 InputSizeInv;
|
|
float2 Padding;
|
|
float SharpeningAmount;
|
|
float EdgeSharpening;
|
|
float MinEdgeThreshold;
|
|
float OverBlurLimit;
|
|
META_CB_END
|
|
|
|
Texture2D Input : register(t0);
|
|
|
|
// Pixel Shader for Contrast Adaptive Sharpening (CAS) filter. Based on AMD FidelityFX implementation.
|
|
META_PS(true, FEATURE_LEVEL_ES2)
|
|
float4 PS_CAS(Quad_VS2PS input) : SV_Target0
|
|
{
|
|
// Sample the color texture
|
|
float4 color = Input.SampleLevel(SamplerLinearClamp, input.TexCoord, 0);
|
|
|
|
// Sample neighboring pixels
|
|
float3 blurred = color.rgb;
|
|
float3 edges = 0.0;
|
|
for (int x = -2; x <= 2; x++)
|
|
{
|
|
for (int y = -2; y <= 2; y++)
|
|
{
|
|
float2 uv = float2(x, y) * InputSizeInv + input.TexCoord;
|
|
float3 neighbor = Input.SampleLevel(SamplerLinearClamp, uv, 0).rgb;
|
|
blurred += neighbor;
|
|
edges += abs(neighbor - color.rgb);
|
|
}
|
|
}
|
|
blurred /= 25.0;
|
|
edges /= 25.0;
|
|
|
|
// Sharpen based on edge detection
|
|
float edgeAmount = saturate((dot(edges, edges) - MinEdgeThreshold) / (0.001 + dot(edges, edges)));
|
|
float sharpen = (1.0 - edgeAmount) * SharpeningAmount + edgeAmount * EdgeSharpening;
|
|
float3 sharpened = color.rgb + (color.rgb - blurred) * sharpen;
|
|
|
|
// Limit sharpening to avoid over-blurring
|
|
sharpened = lerp(color.rgb, sharpened, saturate(OverBlurLimit / (OverBlurLimit + dot(abs(sharpened - color.rgb), float3(1.0, 1.0, 1.0)))));
|
|
return float4(sharpened, color.a);
|
|
}
|