68 lines
1.8 KiB
GLSL
68 lines
1.8 KiB
GLSL
#version 430 core
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in layout(location = 0) vec3 normal;
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in layout(location = 1) vec3 vertex;
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// point lights
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struct Light {
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vec3 position;
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mat4 MV;
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bool is_spot;
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vec3 spot_target; // MV space coordinates
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};
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#define N_LIGHTS 3
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uniform Light light[N_LIGHTS];
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out vec4 color;
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// constants
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float shininess = 15;
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vec3 c_diffuse = vec3(0.75390625, 0.4296875, 0.4375);
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vec3 c_emissive = vec3(0.01171875, 0.0, 0.15234375);
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vec3 c_specular = vec3(0.9453125, 0.94921875, 0.84765625);
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float spot_cuttof_angle = cos(4 / 180.0 * 3.1415926535);
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void main()
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{
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vec3 nnormal = normalize(normal);
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float diffuse_intensity = 0.0;
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float specular_intensity = 0.0;
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for (int i = 0; i<3; i++) {
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vec3 L = vec3(light[i].MV * vec4(light[i].position, 1.0f)) - vertex;
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float attenuation = clamp(1000/(1 + 40*length(L) + 0.1*length(L)*length(L)), 0.0, 1.25);
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L = normalize(L);
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if (light[i].is_spot) {
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vec3 L2 = normalize(vec3(light[i].MV * vec4(light[i].position, 1.0f)) - light[i].spot_target);
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if (dot(L2, L) < spot_cuttof_angle) {
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continue;
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}
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attenuation *= 70;
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}
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float diffuse_i = dot(nnormal, L);
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float specular_i = pow(dot(reflect(-L, nnormal), normalize(vec3(0,0,0) - vertex)), shininess);
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if (diffuse_i > 0) diffuse_intensity += attenuation*diffuse_i;
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if (specular_i > 0) specular_intensity += attenuation*specular_i;
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}
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//diffuse_intensity *= 1.0 / N_LIGHTS;
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//specular_intensity *= 1.0 / N_LIGHTS;
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//float intensity = dot(normalize(normal), normalize(light_pos_2));
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//color = vec4(0.5 * normal + 0.5, 1.0);
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color = vec4(c_emissive
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+ c_diffuse*diffuse_intensity
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+ c_specular*specular_intensity, 1.0f);
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}
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