50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
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precision mediump float;
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uniform sampler2D Texture;
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uniform float Transparency;
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varying vec3 position;
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varying vec3 normal;
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varying vec2 texCoord;
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uniform vec3 lightPos;
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uniform vec3 cameraPos;
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uniform vec3 ambientLight;
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uniform vec3 diffuseLight;
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uniform vec3 specularLight;
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uniform float specularPower;
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void phongModel( vec3 norm, out vec3 ambAndDiff, out vec3 spec )
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{
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vec3 lightDirection = normalize(vec3(lightPos));
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vec3 cameraDirection = normalize(vec3(cameraPos) - position);
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vec3 lightReflection = reflect( -lightDirection, norm );
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float sDotN = max( dot(lightDirection,norm), 0.0 );
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vec3 diffuse = diffuseLight * sDotN;
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ambAndDiff = ambientLight + diffuse;
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spec = vec3(0.0);
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if(sDotN > 0.0)
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{
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spec = specularLight * pow(max( dot(lightReflection, cameraDirection), 0.0 ), specularPower);
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// spec is NAN, if dot == 0 && specularPower <= 0
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}
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}
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void main()
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{
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vec3 ambAndDiff, spec;
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vec3 norm = normalize(normal);
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phongModel(norm, ambAndDiff, spec);
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vec4 textureColor = texture2D(Texture, texCoord).rgba;
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textureColor.r = textureColor.r * ambAndDiff.r + spec.r;
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textureColor.g = textureColor.g * ambAndDiff.g + spec.g;
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textureColor.b = textureColor.b * ambAndDiff.b + spec.b;
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gl_FragColor = textureColor;
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}
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