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56 lines
2 KiB
GLSL
56 lines
2 KiB
GLSL
#version 120
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//
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// model.frag
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// fragment shader
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//
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// Created by Andrzej Kapolka on 10/14/13.
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// Copyright 2013 High Fidelity, Inc.
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//
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// Distributed under the Apache License, Version 2.0.
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// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
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//
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// the diffuse texture
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uniform sampler2D diffuseMap;
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// local lights
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const int MAX_LOCAL_LIGHTS = 2; // 2 lights for now, will probably need more later on
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uniform int numLocalLights;
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uniform vec3 localLightDirections[MAX_LOCAL_LIGHTS];
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uniform vec3 localLightColors[MAX_LOCAL_LIGHTS];
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// the interpolated position
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varying vec4 position;
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// the interpolated normal
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varying vec4 normal;
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void main(void) {
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// compute the base color based on OpenGL lighting model
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vec4 normalizedNormal = normalize(normal);
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float diffuse = dot(normalizedNormal, gl_LightSource[0].position);
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float facingLight = step(0.0, diffuse);
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// the local light that is always present
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vec4 totalLocalLight = vec4(0.0, 0.0, 0.0, 1.0);
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for (int i = 0; i < numLocalLights; i++) {
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float localDiffuse = dot(normalizedNormal, vec4(localLightDirections[i], 1.0));
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float localLight = step(0.0, localDiffuse);
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float localLightVal = localDiffuse * localLight;
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totalLocalLight += (localLightVal * vec4( localLightColors[i], 0.0));
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}
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vec4 base = gl_Color * (gl_FrontLightModelProduct.sceneColor + gl_FrontLightProduct[0].ambient +
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gl_FrontLightProduct[0].diffuse * (diffuse * facingLight) + totalLocalLight);
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// compute the specular component (sans exponent)
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float specular = facingLight * max(0.0, dot(normalize(gl_LightSource[0].position - normalize(vec4(position.xyz, 0.0))),
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normalizedNormal));
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// modulate texture by base color and add specular contribution
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gl_FragColor = base * texture2D(diffuseMap, gl_TexCoord[0].st) +
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vec4(pow(specular, gl_FrontMaterial.shininess) * gl_FrontLightProduct[0].specular.rgb, 0.0);
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}
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