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// $Id$
//
// Fragment shader for camera lighting
//
// Author: Dan Gudmundsson
//
#version 120
#include "lib_base.glsl"
#include "lib_normal.glsl"
#include "lib_envlight.glsl"
#include "lib_material.glsl"
varying vec3 ws_position;
uniform vec3 ws_eyepoint;
uniform vec3 ws_lightpos;
uniform vec3 LightColor;
uniform float Exposure;
void main(void)
{
vec4 baseColor = get_basecolor();
vec3 n = get_normal();
vec3 v = normalize(ws_eyepoint-ws_position); // point to camera
vec3 l = normalize(ws_lightpos-ws_position); // point to light
PBRInfo pbr = calc_views(n, v, l);
pbr = calc_material(pbr);
// Calculate the shading terms for the microfacet specular shading model
vec3 F = specularReflection(pbr);
float G = geometricOcclusion(pbr);
float D = microfacetDistribution(pbr);
// Calculation of analytical lighting contribution
vec3 diffuseContrib = (1.0 - max(max(F.r, F.g), F.b)) * diffuse(pbr);
vec3 specContrib = F * G * D / (4.0 * pbr.NdotL * pbr.NdotV);
// Obtain final intensity as reflectance (BRDF) scaled by the energy of the light (cosine law)
vec3 frag_color = pbr.NdotL * (diffuseContrib + specContrib);
frag_color = frag_color * LightColor;
frag_color += 0.6*background_lighting(pbr, n, normalize(reflect(v, n)));
frag_color = mix(frag_color, frag_color * pbr.occlusion, 0.7);
frag_color += get_emission();
frag_color *= Exposure;
gl_FragColor = vec4(pow(frag_color, vec3(1.0/2.2)), baseColor.a); // Should be 2.2
}
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