76 lines
1.8 KiB
GLSL
76 lines
1.8 KiB
GLSL
#version 440
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in vec3 f_color;
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out vec4 FragColors;
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uniform vec3 Kd;
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uniform vec3 Ka;
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uniform vec3 Ks;
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uniform float Shininess;
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struct LightInfo {
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vec4 Position;
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vec3 Intensity;
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float SpotCutoff;
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float SpotInnerCutoff;
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float SpotExponent;
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vec3 SpotDirection;
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};
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uniform LightInfo Light[64];
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uniform int LightCount;
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in vec3 fNormal;
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in vec3 pos;
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void main()
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{
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vec3 ambient_sum;
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vec3 diffuse_sum;
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vec3 specular_sum;
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vec3 ambient;
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float D;
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float attenuation;
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for (int i=0; i<LightCount; i++)
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{
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D = distance(Light[i].Position.xyz, pos);
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attenuation = 1 / (1 + 0.01 * D + 0.001 * D * D);
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vec3 L = normalize(Light[i].Position.xyz - pos);
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vec3 N = fNormal;
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vec3 V = normalize(-pos);
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//vec3 R = normalize(reflect(-L, N));
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vec3 H = normalize(V + L);
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float SpotAttenuation = 1.0;
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vec spotDot = dot(Light[i].SpotCutoff, Light[i].SpotInnerCutoff);
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float theta = dot(L, normalize(Light[i].SpotDirection)); //Angle between the light direction and the fragment-light vector.
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float phi = ; // Angle between the light direction and the inner cutoff.
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if (theta < Light[i].SpotInnerCutoff)
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{
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SpotAttenuation = 1.0; //No change in the attenuation
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}
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else
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{
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//Fragment is outside the Cone
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//Interpolate between cos(Innercutoff )and cos(cutoff) with cos(theta)
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float Spot = smoothstep(cos(Light[i].SpotCutoff),cos(Light[i].SpotInnerCutoff),cos(theta));
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SpotAttenuation = pow(Spot, Light[i].SpotExponent);
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}
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attenuation *= SpotAttenuation;
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vec3 diffuse = Kd * Light[i].Intensity * max(dot(L, N), 0.0) * attenuation;
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vec3 specular = Ks * Light[i].Intensity * pow(max(dot(H, N), 0.0), Shininess) * attenuation;
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ambient_sum += ambient;
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diffuse_sum += diffuse;
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specular_sum += specular;
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}
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FragColors = vec4(diffuse_sum + specular_sum + ambient_sum / LightCount, 1);
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} |