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REVIEWED: Potential shader issues

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Ray
2025-01-12 20:39:07 +01:00
parent af163ba22a
commit fddfb58f85
5 changed files with 30 additions and 34 deletions
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20
examples/shaders/resources/shaders/glsl120/shadowmap.fs
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@ -46,34 +46,34 @@ void main()
vec4 finalColor = (texelColor*((colDiffuse + vec4(specular, 1.0))*vec4(lightDot, 1.0)));
// Shadow calculations
vec4 fragPosLightSpace = lightVP * vec4(fragPosition, 1);
vec4 fragPosLightSpace = lightVP*vec4(fragPosition, 1);
fragPosLightSpace.xyz /= fragPosLightSpace.w; // Perform the perspective division
fragPosLightSpace.xyz = (fragPosLightSpace.xyz + 1.0f) / 2.0f; // Transform from [-1, 1] range to [0, 1] range
fragPosLightSpace.xyz = (fragPosLightSpace.xyz + 1.0)/2.0; // Transform from [-1, 1] range to [0, 1] range
vec2 sampleCoords = fragPosLightSpace.xy;
float curDepth = fragPosLightSpace.z;
// Slope-scale depth bias: depth biasing reduces "shadow acne" artifacts, where dark stripes appear all over the scene.
// The solution is adding a small bias to the depth
// In this case, the bias is proportional to the slope of the surface, relative to the light
float bias = max(0.0008 * (1.0 - dot(normal, l)), 0.00008);
float bias = max(0.0008*(1.0 - dot(normal, l)), 0.00008);
int shadowCounter = 0;
const int numSamples = 9;
// PCF (percentage-closer filtering) algorithm:
// Instead of testing if just one point is closer to the current point,
// we test the surrounding points as well.
// This blurs shadow edges, hiding aliasing artifacts.
vec2 texelSize = vec2(1.0f / float(shadowMapResolution));
vec2 texelSize = vec2(1.0/float(shadowMapResolution));
for (int x = -1; x <= 1; x++)
{
for (int y = -1; y <= 1; y++)
{
float sampleDepth = texture2D(shadowMap, sampleCoords + texelSize * vec2(x, y)).r;
if (curDepth - bias > sampleDepth)
{
shadowCounter++;
}
float sampleDepth = texture2D(shadowMap, sampleCoords + texelSize*vec2(x, y)).r;
if (curDepth - bias > sampleDepth) shadowCounter++;
}
}
finalColor = mix(finalColor, vec4(0, 0, 0, 1), float(shadowCounter) / float(numSamples));
finalColor = mix(finalColor, vec4(0, 0, 0, 1), float(shadowCounter)/float(numSamples));
// Add ambient lighting whether in shadow or not
finalColor += texelColor*(ambient/10.0)*colDiffuse;