58 lines
1.6 KiB
GLSL
58 lines
1.6 KiB
GLSL
#version 430
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struct Fragment
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{
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vec3 position;
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vec3 normal;
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vec4 material;
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};
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struct Light
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{
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vec3 position;
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vec3 power; // x = ambient, y = diffuse, z = specular
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vec3 ambient;
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vec3 diffuse;
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vec3 specular;
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vec3 fade; // x = constant, y = linear, z = quadratic
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};
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in Fragment fragment;
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#define MAX_LIGHTS 16
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layout(location = 4) uniform vec3 eye_position;
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layout(location = 5) uniform uint num_lights;
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layout(location = 6) uniform Light lights[MAX_LIGHTS];
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out vec4 frag_color;
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void main()
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{
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vec3 accumulator = vec3(0.0);
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vec3 normal = normalize(fragment.normal);
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for (uint i = 0; i < MAX_LIGHTS && i < num_lights; ++i)
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{
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vec3 to_eye = eye_position - fragment.position;
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vec3 to_light = lights[i].position - fragment.position;
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float dist = length(to_light);
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vec3 to_light_norm = to_light / dist; // normalize(to_light);
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vec3 reflected = reflect(-to_light_norm, normal);
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float fade = lights[i].fade.x + lights[i].fade.y * dist + lights[i].fade.z * dist * dist;
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// Multipliers
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// a = ambient, d = diffuse, s = specular
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float a = lights[i].power.x * fragment.material.x / fade;
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float d = lights[i].power.y * fragment.material.y / fade * clamp(dot(to_light_norm, normal), 0.0, 1.0);
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float s = lights[i].power.z * fragment.material.z / fade * pow(clamp(dot(reflected, normal), 0.0, 1.0), clamp(fragment.material.w, 1.0, 1000.0)); // Seems like weird things happen if w is set to 0 and not clamped (maybe it is not exactly 0)
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vec3 color = a * lights[i].ambient + d * lights[i].diffuse + s * lights[i].specular;
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accumulator += color;
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}
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frag_color = vec4(accumulator, 1.0);
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} |