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63 lines
2.3 KiB
GLSL
63 lines
2.3 KiB
GLSL
#version 120
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//
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// model_shadow_map.frag
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// fragment shader
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//
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// Created by Andrzej Kapolka on 5/23/14.
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// Copyright 2014 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 maximum number of local lights to apply
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const int MAX_LOCAL_LIGHTS = 2;
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// the color of each local light
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uniform vec4 localLightColors[MAX_LOCAL_LIGHTS];
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// the direction of each local light
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uniform vec4 localLightDirections[MAX_LOCAL_LIGHTS];
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// the diffuse texture
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uniform sampler2D diffuseMap;
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// the shadow texture
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uniform sampler2DShadow shadowMap;
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// the inverse of the size of the shadow map
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const float shadowScale = 1.0 / 2048.0;
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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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// add up the local lights
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vec4 normalizedNormal = normalize(normal);
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vec4 localLight = vec4(0.0, 0.0, 0.0, 0.0);
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for (int i = 0; i < MAX_LOCAL_LIGHTS; i++) {
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localLight += localLightColors[i] * max(0.0, dot(normalizedNormal, localLightDirections[i]));
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}
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// compute the base color based on OpenGL lighting model
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float diffuse = dot(normalizedNormal, gl_LightSource[0].position);
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float facingLight = step(0.0, diffuse) * 0.25 *
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(shadow2D(shadowMap, gl_TexCoord[1].stp + vec3(-shadowScale, -shadowScale, 0.0)).r +
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shadow2D(shadowMap, gl_TexCoord[1].stp + vec3(-shadowScale, shadowScale, 0.0)).r +
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shadow2D(shadowMap, gl_TexCoord[1].stp + vec3(shadowScale, -shadowScale, 0.0)).r +
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shadow2D(shadowMap, gl_TexCoord[1].stp + vec3(shadowScale, shadowScale, 0.0)).r);
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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) + localLight);
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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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