reo
71e991db77
- No specular on surfaces facing away from the light source - Transform the light direction to view space to ensure that all lighting calculations happen in a consistent coordinate space. - Other lighting tweaks
43 lines
1.3 KiB
GLSL
43 lines
1.3 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; // direction TO the light (normalized)
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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 N = normalize(v_normal);
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vec3 L = normalize(u_light);
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// Classic Blinn-Phong lighting
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// Ambient: always present
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vec3 ambient = base_col * 0.15;
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// Diffuse: N dot L, clamped
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float NdotL = max(dot(N, L), 0.0);
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vec3 diffuse = base_col * NdotL * 0.7;
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// Specular: only on surfaces facing the light (NdotL > 0)
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float specular = 0.0;
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if (NdotL > 0.0) {
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vec3 V = normalize(-v_position); // view direction (camera at origin in view space)
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vec3 H = normalize(L + V); // half-vector
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float NdotH = max(dot(N, H), 0.0);
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specular = pow(NdotH, 32.0) * 0.5; // tighter highlight, moderated intensity
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}
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vec3 result = ambient + diffuse + vec3(specular);
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// Convert from linear to sRGB for display (approximate gamma 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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