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Added PCF smooth shadows

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antopilo
2025-04-17 20:17:31 -04:00
parent a8c38a5a4e
commit 5da09282d0
1 changed files with 43 additions and 0 deletions
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43
Data/Shaders/Vulkan/shading.frag
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@@ -193,6 +193,28 @@ int GetCSMSplit(float depth)
return 0;
}
float SampleShadowMap(int textureId, float2 coords, float compare)
{
return compare > textures[textureId].Sample(mySampler, coords.xy).r;
}
float SampleShadowMapLinear(int textureId, float2 coords, float compare, float2 texelSize)
{
float2 pixelPos = coords / texelSize + float2(0.5f, 0.5f);
float2 fracPart = frac(pixelPos);
float2 startTexel = (pixelPos - fracPart) * texelSize;
float blTexel = SampleShadowMap(textureId, startTexel, compare);
float brTexel = SampleShadowMap(textureId, startTexel + float2(texelSize.x, 0.0), compare);
float tlTexel = SampleShadowMap(textureId, startTexel + float2(0.0, texelSize.y), compare);
float trTexel = SampleShadowMap(textureId, startTexel + texelSize, compare);
float mixA = lerp(blTexel, tlTexel, fracPart.y);
float mixB = lerp(brTexel, trTexel, fracPart.y);
return lerp(mixA, mixB, fracPart.x);
}
float ShadowCalculation(Light light, float3 fragPos, float3 normal)
{
// Find correct CSM splits from depth
@@ -214,6 +236,27 @@ float ShadowCalculation(Light light, float3 fragPos, float3 normal)
//projCoords.y = 1.0 - projCoords.y;
float currentDepth = projCoords.z;
float bias = max(0.005 * (1.0 - dot(normal, light.direction)), 0.0005);
if(splitIndex < 2)
{
const float NUM_SAMPLES = 4.0f;
const float SAMPLES_START = (NUM_SAMPLES - 1.0f) / 2.0f;
const float NUM_SAMPLES_SQUARED = NUM_SAMPLES * NUM_SAMPLES;
float2 texelSize = 1.0f / float2(4096, 4096);
float result = 0.0f;
for(float y = -SAMPLES_START; y <= SAMPLES_START; y += 1.0f)
{
for (float x = -SAMPLES_START; x <= SAMPLES_START; x += 1.0f)
{
float2 coordsOffset = float2(x, y) * texelSize;
result += SampleShadowMapLinear(light.shadowMapTextureId[splitIndex], projCoords.xy + coordsOffset, currentDepth, texelSize);
}
}
return result /= NUM_SAMPLES_SQUARED;
}
float shadowMapDepth = textures[light.shadowMapTextureId[splitIndex]].Sample(mySampler, projCoords.xy).r;
return (currentDepth > shadowMapDepth);//> 0.0 ? 1.0 : 0.0;