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| ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB). |
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| |
| #version 150 core |
| |
| uniform mat4 viewMatrix; |
| |
| uniform vec3 lightPosition; |
| uniform vec3 lightIntensity; |
| |
| uniform vec3 ka; // Ambient reflectivity |
| uniform vec3 kd; // Diffuse reflectivity |
| uniform vec3 ks; // Specular reflectivity |
| uniform float shininess; // Specular shininess factor |
| |
| uniform sampler2DShadow shadowMapTexture; |
| |
| in vec4 positionInLightSpace; |
| |
| in vec3 position; |
| in vec3 normal; |
| |
| out vec4 fragColor; |
| |
| vec3 dsModel(const in vec3 pos, const in vec3 n) |
| { |
| // Calculate the vector from the light to the fragment |
| vec3 s = normalize(vec3(viewMatrix * vec4(lightPosition, 1.0)) - pos); |
| |
| // Calculate the vector from the fragment to the eye position |
| // (origin since this is in "eye" or "camera" space) |
| vec3 v = normalize(-pos); |
| |
| // Reflect the light beam using the normal at this fragment |
| vec3 r = reflect(-s, n); |
| |
| // Calculate the diffuse component |
| float diffuse = max(dot(s, n), 0.0); |
| |
| // Calculate the specular component |
| float specular = 0.0; |
| if (dot(s, n) > 0.0) |
| specular = pow(max(dot(r, v), 0.0), shininess); |
| |
| // Combine the diffuse and specular contributions (ambient is taken into account by the caller) |
| return lightIntensity * (kd * diffuse + ks * specular); |
| } |
| |
| void main() |
| { |
| float shadowMapSample = textureProj(shadowMapTexture, positionInLightSpace); |
| |
| vec3 ambient = lightIntensity * ka; |
| |
| vec3 result = ambient; |
| if (shadowMapSample > 0) |
| result += dsModel(position, normalize(normal)); |
| |
| fragColor = vec4(result, 1.0); |
| } |