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#version 140
uniform sampler2D color;
uniform sampler2D position;
uniform sampler2D normal;
uniform vec2 winSize;
out vec4 fragColor;
const int MAX_LIGHTS = 8;
const int TYPE_POINT = 0;
const int TYPE_DIRECTIONAL = 1;
const int TYPE_SPOT = 2;
struct Light {
int type;
vec3 position;
vec3 color;
float intensity;
vec3 direction;
float constantAttenuation;
float linearAttenuation;
float quadraticAttenuation;
float cutOffAngle;
};
uniform Light lights[MAX_LIGHTS];
uniform int lightCount;
void main()
{
vec2 texCoord = gl_FragCoord.xy / winSize;
vec4 col = texture(color, texCoord);
vec3 pos = texture(position, texCoord).xyz;
vec3 norm = texture(normal, texCoord).xyz;
vec3 lightColor = vec3(0.0);
vec3 s;
for (int i = 0; i < lightCount; ++i) {
float att = 1.0;
if ( lights[i].type != TYPE_DIRECTIONAL ) {
s = lights[i].position - pos;
if (lights[i].constantAttenuation != 0.0
|| lights[i].linearAttenuation != 0.0
|| lights[i].quadraticAttenuation != 0.0) {
float dist = length(s);
att = 1.0 / (lights[i].constantAttenuation + lights[i].linearAttenuation * dist + lights[i].quadraticAttenuation * dist * dist);
}
s = normalize( s );
if ( lights[i].type == TYPE_SPOT ) {
if ( degrees(acos(dot(-s, normalize(lights[i].direction))) ) > lights[i].cutOffAngle)
att = 0.0;
}
} else {
s = normalize( -lights[i].direction );
}
float diffuse = max( dot( s, norm ), 0.0 );
lightColor += att * lights[i].intensity * diffuse * lights[i].color;
}
fragColor = vec4(col.rgb * lightColor, col.a);
}
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