34 lines
1.1 KiB
GLSL
34 lines
1.1 KiB
GLSL
#version 330 core
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in vec3 v_normal;
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in vec2 v_tex;
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in vec3 v_position;
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out vec4 frag_color;
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uniform vec3 u_light;
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uniform sampler2D tex;
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uniform vec3 color; // base colour factor (acts as solid colour when no texture)
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void main() {
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// Combine base texture (or constant white) with colour factor supplied by CPU.
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vec3 base_col = texture(tex, v_tex).rgb * color;
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vec3 ambient_color = base_col * 0.2;
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vec3 diffuse_color = base_col * 0.6;
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vec3 specular_color = vec3(1.0);
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// u_light is the direction **from the light towards the fragment**.
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float diffuse = max(dot(normalize(v_normal), normalize(u_light)), 0.0);
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vec3 camera_dir = normalize(-v_position);
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vec3 half_dir = normalize(normalize(u_light) + camera_dir);
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float specular = pow(max(dot(half_dir, normalize(v_normal)), 0.0), 16.0);
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vec3 result = ambient_color + diffuse * diffuse_color + specular * specular_color;
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// Convert from linear to sRGB for display (approximate γ-correction)
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result = pow(result, vec3(1.0 / 2.2));
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frag_color = vec4(result, 1.0);
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}
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