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60 lines
2.2 KiB
GLSL
60 lines
2.2 KiB
GLSL
#version 120
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//
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// directional_light.frag
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// fragment shader
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//
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// Created by Andrzej Kapolka on 9/3/14.
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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 diffuse texture
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uniform sampler2D diffuseMap;
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// the normal texture
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uniform sampler2D normalMap;
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// the depth texture
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uniform sampler2D depthMap;
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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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uniform float shadowScale;
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// the distance to the near clip plane
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uniform float near;
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// scale factor for depth: (far - near) / far
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uniform float depthScale;
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// offset for depth texture coordinates
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uniform vec2 depthTexCoordOffset;
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// scale for depth texture coordinates
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uniform vec2 depthTexCoordScale;
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void main(void) {
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// compute the view space position using the depth
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float z = near / (texture2D(depthMap, gl_TexCoord[0].st).r * depthScale - 1.0);
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vec4 position = vec4((depthTexCoordOffset + gl_TexCoord[0].st * depthTexCoordScale) * z, z, 1.0);
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// compute the corresponding texture coordinates
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vec3 shadowTexCoord = vec3(dot(gl_EyePlaneS[0], position), dot(gl_EyePlaneT[0], position), dot(gl_EyePlaneR[0], position));
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// compute the color based on OpenGL lighting model, use the alpha from the normal map
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vec4 normal = texture2D(normalMap, gl_TexCoord[0].st);
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float diffuse = dot(normal * 2.0 - vec4(1.0, 1.0, 1.0, 2.0), gl_LightSource[0].position);
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float facingLight = step(0.0, diffuse) * 0.25 *
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(shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, -shadowScale, 0.0)).r +
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shadow2D(shadowMap, shadowTexCoord + vec3(-shadowScale, shadowScale, 0.0)).r +
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shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, -shadowScale, 0.0)).r +
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shadow2D(shadowMap, shadowTexCoord + vec3(shadowScale, shadowScale, 0.0)).r);
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vec4 baseColor = texture2D(diffuseMap, gl_TexCoord[0].st) * (gl_FrontLightModelProduct.sceneColor +
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gl_FrontLightProduct[0].ambient + gl_FrontLightProduct[0].diffuse * (diffuse * facingLight));
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gl_FragColor = vec4(baseColor.rgb, normal.a);
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}
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