46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
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#version 440
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in vec3 vs_position;
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in mat4 vs_transform;
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in vec2 vs_texcoord;
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in vec3 vs_normal;
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in vec3 vs_to_light;
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in vec3 vs_to_camera;
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uniform bool texture_is_set;
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uniform sampler2D vs_texture;
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uniform vec3 light_color;
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uniform float shine_damper;
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uniform float reflectivity;
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out vec4 fs_color;
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void main() {
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// Lighting
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vec3 unit_normal = normalize(vs_normal);
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vec3 unit_light_vector = normalize(vs_to_light);
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float dot_prod = dot(unit_normal, unit_light_vector);
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float brightness = max(dot_prod, 0.f);
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vec3 diffuse = brightness * light_color;
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// Specular lighting
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// only do all this math is reflectivity is > 0
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vec3 final_specular = vec3(0.f);
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if (reflectivity > 0) {
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vec3 unit_vector_to_camera = normalize(vs_to_camera);
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vec3 light_direction = -unit_vector_to_camera;
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vec3 reflected_light_dir = reflect(light_direction, unit_normal);
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float specular_factor = dot(reflected_light_dir, unit_vector_to_camera);
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specular_factor = max(specular_factor, 0.f);
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float damped_specular = pow(specular_factor, shine_damper);
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final_specular = damped_specular * reflectivity * light_color;
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}
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if (texture_is_set) {
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//fs_color = vec4(0.5 * unit_normal + vec3(0.5), 1.f); // Visualize normals
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fs_color = vec4(diffuse, 1.f) * texture(vs_texture, vs_texcoord) + vec4(final_specular, 1.f);
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} else {
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fs_color = vec4(diffuse, 1.f) + vec4(final_specular, 1.f);
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}
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}
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