131 lines
5.0 KiB
GLSL
131 lines
5.0 KiB
GLSL
#version 150
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in vec3 vNormal;
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in vec2 vTexCoord;
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in vec4 fragPosition;
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in vec4 shadowCoord;
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out vec4 oColor;
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uniform sampler2D uTexture;
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uniform sampler2DShadow shadowMap;
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uniform samplerCubeShadow shadowMap_cube;
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uniform vec3 ambientColor;
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uniform float ambientFactor;
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uniform float diffuseFactor;
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uniform float specularFactor;
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uniform vec3 camera;
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uniform float shininess;
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uniform int lightCount;
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uniform vec3 directionalLightVector;
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uniform vec3 directionalColor;
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uniform float directionalIntensity;
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uniform vec3 lightSources[32];
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uniform vec3 lightColors[32];
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uniform float lightIntensities[32];
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uniform float farPlane;
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uniform vec4 fogColor;
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uniform vec3 cameraCenter;
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vec2 poissonDisk[16] = vec2[](
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vec2( -0.94201624, -0.39906216 ),
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vec2( 0.94558609, -0.76890725 ),
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vec2( -0.094184101, -0.92938870 ),
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vec2( 0.34495938, 0.29387760 ),
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vec2( -0.91588581, 0.45771432 ),
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vec2( -0.81544232, -0.87912464 ),
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vec2( -0.38277543, 0.27676845 ),
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vec2( 0.97484398, 0.75648379 ),
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vec2( 0.44323325, -0.97511554 ),
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vec2( 0.53742981, -0.47373420 ),
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vec2( -0.26496911, -0.41893023 ),
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vec2( 0.79197514, 0.19090188 ),
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vec2( -0.24188840, 0.99706507 ),
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vec2( -0.81409955, 0.91437590 ),
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vec2( 0.19984126, 0.78641367 ),
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vec2( 0.14383161, -0.14100790 )
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);
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float sampleDirectionalShadow(sampler2DShadow shadowMap, vec4 shadowCoord) {
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float nearPlane = 0.1;
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float visibility = 1.0;
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float bias = 0.001*tan(acos(clamp(dot(vNormal, -directionalLightVector), 0.0, 1.0)));
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bias = clamp(bias, 0.0, 0.01);
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/*for (int i=0; i<4; i++) {
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visibility -= directionalIntensity/16*(1.0-texture(shadowMap, vec3(shadowCoord.xy + poissonDisk[i]/700.0, (2.0 * nearPlane)/(farPlane+ nearPlane - shadowCoord.z * (farPlane - nearPlane))- bias)));
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}
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if (visibility == 1.0-(directionalIntensity/16)*4)
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{
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visibility = 1.0-directionalIntensity;
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}
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else if (visibility != 1.0) {
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for (int i=0; i<12; i++) {
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visibility -= directionalIntensity/16*(1.0-texture(shadowMap, vec3(shadowCoord.xy + poissonDisk[i]/700.0, (2.0 * nearPlane)/(farPlane+ nearPlane - shadowCoord.z * (farPlane - nearPlane))- bias)));
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}
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}*/
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visibility = texture(shadowMap, vec3(shadowCoord.xy, (shadowCoord.z - bias)/shadowCoord.w));
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return (2.0 * nearPlane) / (farPlane + nearPlane - visibility * (farPlane - nearPlane));
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}
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float samplePointShadow(samplerCubeShadow shadowMap, vec3 lightDirection) {
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float bias = 0.005;
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return texture(shadowMap, vec4(lightDirection.xyz , length(lightDirection) - bias));
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}
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float distanceToBorder(vec2 vector) {
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float xDistance = min(vector.x, 1.0-vector.x);
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float yDistance = min(vector.y, 1.0-vector.y);
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return min(xDistance, yDistance);
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}
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void main()
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{
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vec3 ambientColor = ambientFactor * ambientColor;
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vec3 diffuseColor = vec3(0.0, 0.0, 0.0);
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vec3 specularColor = vec3(0.0, 0.0, 0.0);
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// direction lighting
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if(length(directionalLightVector)>0.0f) {
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vec3 directionalVector = normalize(directionalLightVector);
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diffuseColor += clamp(dot(normalize(vNormal), directionalVector)
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*diffuseFactor*directionalIntensity*directionalColor, 0.0, 1.0);
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vec3 cameraVector = normalize(camera - vec3(fragPosition));
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specularColor += clamp(pow((dot((cameraVector+directionalVector),normalize(vNormal))/(length(cameraVector+directionalVector)*length(normalize(vNormal)))),shininess), 0.0, 1.0)
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*specularFactor*directionalIntensity*directionalColor;
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}
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// point lights
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float visibility = 1.0;
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for(int i = 0; i<lightCount; i++) {
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vec3 lightDirection = vec3(fragPosition) - lightSources[i];
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float distance = length(lightDirection);
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// only take lights into account with meaningful contribution
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if (distance > 0.001f) {
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vec3 lightVector = normalize(lightSources[i]-vec3(fragPosition));
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float intensity = clamp(exp(-(1/lightIntensities[i])*distance), 0.0, 1.0);
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diffuseColor += clamp(dot(normalize(vNormal), lightVector)
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*diffuseFactor*intensity*lightColors[i], 0.0, 1.0);
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vec3 cameraVector = normalize(camera - vec3(fragPosition));
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specularColor += clamp(pow((dot((cameraVector+lightVector),normalize(vNormal))/(length(cameraVector+lightVector)*length(normalize(vNormal)))),shininess), 0.0, 1.0)
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*specularFactor*intensity*lightColors[i];
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visibility = samplePointShadow(shadowMap_cube, lightDirection);
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}
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}
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// shadows
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visibility *= sampleDirectionalShadow(shadowMap, shadowCoord);
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specularColor *= visibility;
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diffuseColor *= visibility;
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vec3 finalColor = specularColor + diffuseColor + ambientColor;
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float distanceCameraCenter = distance(cameraCenter, vec3(fragPosition));
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float fogFactor = clamp((1.0 - ((farPlane - 35.0) -distanceCameraCenter)/30.0), 0.0, 1.0);
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fogFactor *= clamp((1.0-((fragPosition.y-8.0)/30.0)), 0.0, 1.0);
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vec4 texture = texture(uTexture, vTexCoord).rgba;
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oColor = vec4(finalColor, 1.0f)*texture;
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oColor = mix(oColor, fogColor, fogFactor);
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}
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