73 lines
3.7 KiB
GLSL
73 lines
3.7 KiB
GLSL
#version 330
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/********************************************************************************
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* OpenGL-Framework *
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* Copyright (c) 2015 Daniel Chappuis *
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*********************************************************************************
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* *
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* This software is provided 'as-is', without any express or implied warranty. *
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* In no event will the authors be held liable for any damages arising from the *
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* use of this software. *
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* *
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* Permission is granted to anyone to use this software for any purpose, *
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* including commercial applications, and to alter it and redistribute it *
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* freely, subject to the following restrictions: *
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* *
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* 1. The origin of this software must not be misrepresented; you must not claim *
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* that you wrote the original software. If you use this software in a *
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* product, an acknowledgment in the product documentation would be *
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* appreciated but is not required. *
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* *
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* 2. Altered source versions must be plainly marked as such, and must not be *
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* misrepresented as being the original software. *
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* *
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* 3. This notice may not be removed or altered from any source distribution. *
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* *
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********************************************************************************/
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// Uniform variables
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uniform vec3 lightAmbientColor; // Lights ambient color
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uniform vec3 light0PosCameraSpace; // Camera-space position of the light
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uniform vec3 light0DiffuseColor; // Light 0 diffuse color
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uniform vec3 light0SpecularColor; // Light 0 specular color
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uniform float shininess; // Shininess
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uniform sampler2D textureSampler; // Texture
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uniform bool isTexture; // True if we need to use the texture
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uniform vec4 vertexColor; // Vertex color
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// In variables
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in vec3 vertexPosCameraSpace; // Camera-space position of the vertex
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in vec3 vertexNormalCameraSpace; // Vertex normal in camera-space
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in vec2 texCoords; // Texture coordinates
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// Out variable
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out vec4 color; // Output color
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void main() {
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// Compute the ambient term
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vec3 ambient = lightAmbientColor;
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// Get the texture color
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vec3 textureColor = vertexColor.rgb;
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if (isTexture) textureColor = texture(textureSampler, texCoords).rgb;
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// Compute the surface normal vector
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vec3 N = normalize(vertexNormalCameraSpace);
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// Compute the diffuse term of light 0
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vec3 L0 = normalize(light0PosCameraSpace - vertexPosCameraSpace);
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float diffuseFactor = max(dot(N, L0), 0.0);
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vec3 diffuse = light0DiffuseColor * diffuseFactor * textureColor;
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// Compute the specular term of light 0
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vec3 V = normalize(-vertexPosCameraSpace);
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vec3 H0 = normalize(V + L0);
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float specularFactor = pow(max(dot(N, H0), 0.0), shininess);
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if (diffuseFactor < 0.0) specularFactor = 0.0;
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vec3 specular = light0SpecularColor * specularFactor;
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// Compute the final color
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color = vec4(ambient + diffuse + specular, 1.0);
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}
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