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PCF for point shadows

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Derek Christ
2020-10-10 19:51:12 +02:00
parent 55b8efc6c4
commit 911e004291
2 changed files with 24 additions and 11 deletions
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2
.gitignore vendored
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@@ -3,3 +3,5 @@ build
lib/assimp/libassimp.so.5.0.0 lib/assimp/libassimp.so.5.0.0
res/models res/models
res/textures res/textures
.kdev4/Fall-Fever.kdev4
Fall-Fever.kdev4

33
res/shaders/basic.frag
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@@ -70,6 +70,14 @@ uniform samplerCube u_texture_pointShadowMap0;
//uniform samplerCube u_texture_pointShadowMap2; //uniform samplerCube u_texture_pointShadowMap2;
//uniform samplerCube u_texture_pointShadowMap3; //uniform samplerCube u_texture_pointShadowMap3;
vec3 sampleOffsetDirections[20] = vec3[] (
vec3( 1, 1, 1), vec3( 1, -1, 1), vec3(-1, -1, 1), vec3(-1, 1, 1),
vec3( 1, 1, -1), vec3( 1, -1, -1), vec3(-1, -1, -1), vec3(-1, 1, -1),
vec3( 1, 1, 0), vec3( 1, -1, 0), vec3(-1, -1, 0), vec3(-1, 1, 0),
vec3( 1, 0, 1), vec3(-1, 0, 1), vec3( 1, 0, -1), vec3(-1, 0, -1),
vec3( 0, 1, 1), vec3( 0, -1, 1), vec3( 0, -1, -1), vec3( 0, 1, -1)
);
uniform bool b_drawShadows; uniform bool b_drawShadows;
uniform float pointShadowDepthMapFarPlane; uniform float pointShadowDepthMapFarPlane;
@@ -120,8 +128,7 @@ vec3 directionalLightContribution(DirectionalLight light, vec3 normal, vec3 view
computeShading(light.ambient, light.diffuse, light.specular, lightDir, viewDir, normal, ambient, diffuse, specular); computeShading(light.ambient, light.diffuse, light.specular, lightDir, viewDir, normal, ambient, diffuse, specular);
float shadows = 0.0f; float shadows = 0.0f;
//if(b_drawShadows) if(b_drawShadows)
if(false)
shadows = computeDirectionalShadows(v_fragmentPositionDirectionalLightSpace, normal, lightDir); shadows = computeDirectionalShadows(v_fragmentPositionDirectionalLightSpace, normal, lightDir);
return (ambient + (1.0f - shadows) * (diffuse + specular)); return (ambient + (1.0f - shadows) * (diffuse + specular));
@@ -245,18 +252,22 @@ float computePointShadows(vec3 fragPos, vec3 lightPos) {
// get vector between fragment position and light position // get vector between fragment position and light position
vec3 fragToLight = fragPos - lightPos; vec3 fragToLight = fragPos - lightPos;
// use the light to fragment vector to sample from the depth map
float closestDepth = texture(u_texture_pointShadowMap0, fragToLight).r;
// it is currently in linear range between [0,1]. Re-transform back to original value
closestDepth *= pointShadowDepthMapFarPlane;
// now get current linear depth as the length between the fragment and light position // now get current linear depth as the length between the fragment and light position
float currentDepth = length(fragToLight); float currentDepth = length(fragToLight);
// now test for shadows float shadow = 0.0;
float bias = 0.05; float bias = 0.05;
float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0; int samples = 20;
float viewDistance = length(u_viewPosition - fragPos);
float diskRadius = 0.05;
for(int i = 0; i < samples; ++i) {
float closestDepth = texture(u_texture_pointShadowMap0, fragToLight + sampleOffsetDirections[i] * diskRadius).r;
closestDepth *= pointShadowDepthMapFarPlane;
if(currentDepth - bias > closestDepth)
shadow += 1.0;
}
shadow /= float(samples);
return shadow; return shadow;
} }