76 lines
1.9 KiB
GLSL
76 lines
1.9 KiB
GLSL
#version 330 core
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uniform sampler2D u_texture;
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uniform sampler2D u_normal_texture;
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uniform vec3 u_campos;
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uniform vec3 u_highlight;
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uniform float u_time;
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in vec3 v_position;
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in vec3 v_normal;
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in vec3 v_proj_normal;
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in vec2 v_texcoord;
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in vec3 v_tangent;
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in vec3 v_bitangent;
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layout (location=0) out vec4 v_output;
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float kpc(float d, float min, float max)
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{
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if (d >= max) return 1.0;
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if (d <= min) return 0.0;
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return 1.0 - (max - d) / (max - min);
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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 diffuse;
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float radius;
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};
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float Lambert(vec3 n, vec3 l)
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{
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vec3 nrmn = normalize(n);
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vec3 nrml = normalize(l);
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float res = dot(nrmn, nrml);
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return max(res, 0.0);
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}
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vec4 MakeLight(vec3 norm, vec3 position, vec3 diffuse, float radius, float sharpness, float power)
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{
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Light light;
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light.position = position;
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light.diffuse = diffuse;
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light.radius = radius;
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vec4 res = vec4(light.diffuse * Lambert(norm, normalize(light.position)), 1.0);
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float alpha = kpc(distance(light.position, v_position), light.radius * sharpness, light.radius);
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res *= mix(vec4(light.diffuse, 1), vec4(0,0,0,1.0), alpha);
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return res;
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}
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void main()
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{
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vec3 tangentNormal = texture(u_normal_texture, v_texcoord).xyz * 2.0 - 1.0;
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vec3 T = normalize(v_tangent);
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vec3 B = normalize(v_bitangent);
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vec3 N = normalize(v_normal);
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mat3 TBN = mat3(T, B, N);
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vec3 norm = normalize(TBN * tangentNormal);
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vec4 texv = texture(u_texture, v_texcoord);
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//norm = abs(norm);
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vec4 ambient = vec4(0.1, 0.1, 0.1, 1.0) * 1.5, light = ambient;
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light += MakeLight(norm, u_campos, vec3(1.0, 1.0, 1.0), 5.0, 0.0, 1.0);
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light += MakeLight(norm, vec3(5.0, 2.0, -7.0 + cos(u_time/35.0) * 2.0), vec3(1.0, 0.6, 0.0), 5.0, 0.6, 1.0);
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light += MakeLight(norm, vec3(7, 2.0, -7.0 + -cos(u_time / 30.0) * 1.0), vec3(0.6, 0.9, 1.0), 5.0, 0.6, 1.0);
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v_output = texv * light;
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// + editor highlighting
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v_output.rgb *= u_highlight;
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}
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