Moved shaders to new directory
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#version 450
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layout (binding = 1) uniform sampler2D samplerposition;
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layout (binding = 2) uniform sampler2D samplerNormal;
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layout (binding = 3) uniform sampler2D samplerAlbedo;
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layout (binding = 5) uniform sampler2DArray samplerShadowMap;
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layout (location = 0) in vec2 inUV;
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layout (location = 0) out vec4 outFragColor;
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#define LIGHT_COUNT 3
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#define SHADOW_FACTOR 0.25
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#define AMBIENT_LIGHT 0.1
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#define USE_PCF
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struct Light
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{
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vec4 position;
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vec4 target;
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vec4 color;
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mat4 viewMatrix;
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};
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layout (binding = 4) uniform UBO
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{
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vec4 viewPos;
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Light lights[LIGHT_COUNT];
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int useShadows;
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int debugDisplayTarget;
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} ubo;
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float textureProj(vec4 P, float layer, vec2 offset)
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{
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float shadow = 1.0;
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vec4 shadowCoord = P / P.w;
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shadowCoord.st = shadowCoord.st * 0.5 + 0.5;
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if (shadowCoord.z > -1.0 && shadowCoord.z < 1.0)
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{
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float dist = texture(samplerShadowMap, vec3(shadowCoord.st + offset, layer)).r;
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if (shadowCoord.w > 0.0 && dist < shadowCoord.z)
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{
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shadow = SHADOW_FACTOR;
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}
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}
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return shadow;
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}
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float filterPCF(vec4 sc, float layer)
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{
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ivec2 texDim = textureSize(samplerShadowMap, 0).xy;
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float scale = 1.5;
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float dx = scale * 1.0 / float(texDim.x);
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float dy = scale * 1.0 / float(texDim.y);
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float shadowFactor = 0.0;
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int count = 0;
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int range = 1;
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for (int x = -range; x <= range; x++)
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{
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for (int y = -range; y <= range; y++)
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{
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shadowFactor += textureProj(sc, layer, vec2(dx*x, dy*y));
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count++;
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}
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}
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return shadowFactor / count;
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}
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vec3 shadow(vec3 fragcolor, vec3 fragpos) {
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for(int i = 0; i < LIGHT_COUNT; ++i)
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{
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vec4 shadowClip = ubo.lights[i].viewMatrix * vec4(fragpos, 1.0);
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float shadowFactor;
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#ifdef USE_PCF
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shadowFactor= filterPCF(shadowClip, i);
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#else
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shadowFactor = textureProj(shadowClip, i, vec2(0.0));
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#endif
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fragcolor *= shadowFactor;
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}
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return fragcolor;
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}
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void main()
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{
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// Get G-Buffer values
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vec3 fragPos = texture(samplerposition, inUV).rgb;
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vec3 normal = texture(samplerNormal, inUV).rgb;
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vec4 albedo = texture(samplerAlbedo, inUV);
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// Debug display
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if (ubo.debugDisplayTarget > 0) {
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switch (ubo.debugDisplayTarget) {
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case 1:
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outFragColor.rgb = shadow(vec3(1.0), fragPos).rgb;
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break;
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case 2:
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outFragColor.rgb = fragPos;
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break;
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case 3:
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outFragColor.rgb = normal;
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break;
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case 4:
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outFragColor.rgb = albedo.rgb;
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break;
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case 5:
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outFragColor.rgb = albedo.aaa;
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break;
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}
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outFragColor.a = 1.0;
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return;
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}
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// Ambient part
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vec3 fragcolor = albedo.rgb * AMBIENT_LIGHT;
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vec3 N = normalize(normal);
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for(int i = 0; i < LIGHT_COUNT; ++i)
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{
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// Vector to light
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vec3 L = ubo.lights[i].position.xyz - fragPos;
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// Distance from light to fragment position
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float dist = length(L);
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L = normalize(L);
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// Viewer to fragment
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vec3 V = ubo.viewPos.xyz - fragPos;
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V = normalize(V);
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float lightCosInnerAngle = cos(radians(15.0));
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float lightCosOuterAngle = cos(radians(25.0));
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float lightRange = 100.0;
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// Direction vector from source to target
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vec3 dir = normalize(ubo.lights[i].position.xyz - ubo.lights[i].target.xyz);
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// Dual cone spot light with smooth transition between inner and outer angle
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float cosDir = dot(L, dir);
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float spotEffect = smoothstep(lightCosOuterAngle, lightCosInnerAngle, cosDir);
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float heightAttenuation = smoothstep(lightRange, 0.0f, dist);
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// Diffuse lighting
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float NdotL = max(0.0, dot(N, L));
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vec3 diff = vec3(NdotL);
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// Specular lighting
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vec3 R = reflect(-L, N);
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float NdotR = max(0.0, dot(R, V));
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vec3 spec = vec3(pow(NdotR, 16.0) * albedo.a * 2.5);
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fragcolor += vec3((diff + spec) * spotEffect * heightAttenuation) * ubo.lights[i].color.rgb * albedo.rgb;
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}
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// Shadow calculations in a separate pass
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if (ubo.useShadows > 0)
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{
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fragcolor = shadow(fragcolor, fragPos);
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}
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outFragColor = vec4(fragcolor, 1.0);
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}
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