45 lines
1.4 KiB
Forth
45 lines
1.4 KiB
Forth
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precision highp float;
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varying vec2 uv;
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varying vec3 toLightVector[8];
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varying vec3 surfaceNormal;
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varying vec3 toCameraVector;
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uniform sampler2D texture0;
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uniform vec3 lightColor[8];
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uniform vec3 attenuation[8];
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void main() {
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float reflectivity = 0.0;
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float shineDamper = 0.0;
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vec3 unitNormal = normalize(surfaceNormal);
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vec3 unitVectorToCamera = normalize(toCameraVector);
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vec3 totalDiffuse = vec3(0.0);
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vec3 totalSpecular = vec3(0.0);
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for(int i=0;i<8;i++){
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float distance = length(toLightVector[i]);
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float attFactor = attenuation[i].x + (attenuation[i].y * distance) + (attenuation[i].z * distance * distance);
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vec3 unitLightVector = normalize(toLightVector[i]);
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float nDotl = dot(unitNormal,unitLightVector);
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float brightness = max(nDotl,0.0);
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vec3 lightDirection = -unitLightVector;
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vec3 reflectedLightDirection = reflect(lightDirection, unitNormal);
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float specularFactor = dot(reflectedLightDirection, unitVectorToCamera);
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specularFactor = max(specularFactor,0.0);
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float dampedFactor = pow(specularFactor,shineDamper);
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totalDiffuse = totalDiffuse + (brightness * lightColor[i]) / attFactor;
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totalSpecular = totalSpecular + (dampedFactor * reflectivity * lightColor[i]) / attFactor;
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}
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totalDiffuse = max(totalDiffuse,0.2);
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vec4 textureColor = texture2D(texture0, uv * 40.0);
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if(textureColor.a<0.5){
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discard;
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}
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gl_FragColor = vec4(totalDiffuse,1.0) * textureColor + vec4(totalSpecular,1.0);
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}
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