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#version 330
/*
This file is part of the MinGfx Project.
Copyright (c) 2017,2018 Regents of the University of Minnesota.
All Rights Reserved.
Original Author(s) of this File:
Dan Keefe, 2018, University of Minnesota
Author(s) of Significant Updates/Modifications to the File:
...
*/
const int MAX_LIGHTS = 10;
in vec3 N;
in vec3 v;
in vec2 uv;
in vec4 col_interp;
out vec4 fragColor;
uniform int NumLights;
uniform vec3 LightPositions[MAX_LIGHTS];
uniform vec4 LightIntensitiesAmbient[MAX_LIGHTS];
uniform vec4 LightIntensitiesDiffuse[MAX_LIGHTS];
uniform vec4 LightIntensitiesSpecular[MAX_LIGHTS];
uniform vec4 MatReflectanceAmbient;
uniform vec4 MatReflectanceDiffuse;
uniform vec4 MatReflectanceSpecular;
uniform float MatReflectanceShininess;
uniform int UseSurfaceTexture;
uniform sampler2D SurfaceTexture;
void main() {
// initialize the fragment color to the interpolated value of per-vertex colors
// since some meshes will have color specified per-vertex. if there are no
// per vertex colors, then this will default to white.
fragColor = col_interp;
// if there is a surface texture, then factor this into the base color of this
// fragment as well
if (UseSurfaceTexture != 0) {
fragColor *= texture(SurfaceTexture, uv);
}
// modulate this base color by the additive intensity from all light sources
vec3 Ia = vec3(0,0,0);
vec3 Id = vec3(0,0,0);
vec3 Is = vec3(0,0,0);
vec3 n = normalize(N);
for (int i=0; i<NumLights; i++) {
vec3 L = normalize(LightPositions[i] - v);
vec3 V = normalize(-v); // eye is at (0,0,0)
vec3 R = normalize(-reflect(L,N));
Ia += MatReflectanceAmbient.rgb * LightIntensitiesAmbient[i].rgb;
if (dot(n,L) > 0.0) {
Id += clamp(MatReflectanceDiffuse.rgb * LightIntensitiesDiffuse[i].rgb * max(dot(n, L), 0.0), 0.0, 1.0);
Is += MatReflectanceSpecular.rgb * LightIntensitiesSpecular[i].rgb * pow(max(dot(R, V), 0.0), MatReflectanceShininess);
Is = clamp(Is, 0.0, 1.0);
}
}
fragColor.rgb *= Ia + Id + Is;
}
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