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+#version 330
+
+in vec3 fragPosition;
+in vec2 fragTexCoord;
+in vec4 fragColor;
+in vec3 fragNormal;
+
+out vec4 finalColor;
+
+uniform sampler2D texture0;
+uniform sampler2D texture1;
+uniform sampler2D texture2;
+
+uniform vec4 colAmbient;
+uniform vec4 colDiffuse;
+uniform vec4 colSpecular;
+uniform float glossiness;
+
+uniform int useNormal;
+uniform int useSpecular;
+
+uniform mat4 modelMatrix;
+uniform vec3 viewDir;
+
+struct Light {
+ int enabled;
+ int type;
+ vec3 position;
+ vec3 direction;
+ vec4 diffuse;
+ float intensity;
+ float radius;
+ float coneAngle;
+};
+
+const int maxLights = 8;
+uniform Light lights[maxLights];
+
+vec3 ComputeLightPoint(Light l, vec3 n, vec3 v, float s)
+{
+ vec3 surfacePos = vec3(modelMatrix*vec4(fragPosition, 1));
+ vec3 surfaceToLight = l.position - surfacePos;
+
+ // Diffuse shading
+ float brightness = clamp(float(dot(n, surfaceToLight)/(length(surfaceToLight)*length(n))), 0.0, 1.0);
+ float diff = 1.0/dot(surfaceToLight/l.radius, surfaceToLight/l.radius)*brightness*l.intensity;
+
+ // Specular shading
+ float spec = 0.0;
+ if (diff > 0.0)
+ {
+ vec3 h = normalize(-l.direction + v);
+ spec = pow(abs(dot(n, h)), 3.0 + glossiness)*s;
+ }
+
+ return (diff*l.diffuse.rgb + spec*colSpecular.rgb);
+}
+
+vec3 ComputeLightDirectional(Light l, vec3 n, vec3 v, float s)
+{
+ vec3 lightDir = normalize(-l.direction);
+
+ // Diffuse shading
+ float diff = clamp(float(dot(n, lightDir)), 0.0, 1.0)*l.intensity;
+
+ // Specular shading
+ float spec = 0.0;
+ if (diff > 0.0)
+ {
+ vec3 h = normalize(lightDir + v);
+ spec = pow(abs(dot(n, h)), 3.0 + glossiness)*s;
+ }
+
+ // Combine results
+ return (diff*l.intensity*l.diffuse.rgb + spec*colSpecular.rgb);
+}
+
+vec3 ComputeLightSpot(Light l, vec3 n, vec3 v, float s)
+{
+ vec3 surfacePos = vec3(modelMatrix*vec4(fragPosition, 1));
+ vec3 lightToSurface = normalize(surfacePos - l.position);
+ vec3 lightDir = normalize(-l.direction);
+
+ // Diffuse shading
+ float diff = clamp(float(dot(n, lightDir)), 0.0, 1.0)*l.intensity;
+
+ // Spot attenuation
+ float attenuation = clamp(float(dot(n, lightToSurface)), 0.0, 1.0);
+ attenuation = dot(lightToSurface, -lightDir);
+
+ float lightToSurfaceAngle = degrees(acos(attenuation));
+ if (lightToSurfaceAngle > l.coneAngle) attenuation = 0.0;
+
+ float falloff = (l.coneAngle - lightToSurfaceAngle)/l.coneAngle;
+
+ // Combine diffuse and attenuation
+ float diffAttenuation = diff*attenuation;
+
+ // Specular shading
+ float spec = 0.0;
+ if (diffAttenuation > 0.0)
+ {
+ vec3 h = normalize(lightDir + v);
+ spec = pow(abs(dot(n, h)), 3.0 + glossiness)*s;
+ }
+
+ return (falloff*(diffAttenuation*l.diffuse.rgb + spec*colSpecular.rgb));
+}
+
+void main()
+{
+ // Calculate fragment normal in screen space
+ // NOTE: important to multiply model matrix by fragment normal to apply model transformation (rotation and scale)
+ mat3 normalMatrix = mat3(modelMatrix);
+ vec3 normal = normalize(normalMatrix*fragNormal);
+
+ // Normalize normal and view direction vectors
+ vec3 n = normalize(normal);
+ vec3 v = normalize(viewDir);
+
+ // Calculate diffuse texture color fetching
+ vec4 texelColor = texture(texture0, fragTexCoord);
+ vec3 lighting = colAmbient.rgb;
+
+ // Calculate normal texture color fetching or set to maximum normal value by default
+ if (useNormal == 1)
+ {
+ n *= texture(texture1, fragTexCoord).rgb;
+ n = normalize(n);
+ }
+
+ // Calculate specular texture color fetching or set to maximum specular value by default
+ float spec = 1.0;
+ if (useSpecular == 1) spec = texture(texture2, fragTexCoord).r;
+
+ for (int i = 0; i < maxLights; i++)
+ {
+ // Check if light is enabled
+ if (lights[i].enabled == 1)
+ {
+ // Calculate lighting based on light type
+ if (lights[i].type == 0) lighting += ComputeLightPoint(lights[i], n, v, spec);
+ else if (lights[i].type == 1) lighting += ComputeLightDirectional(lights[i], n, v, spec);
+ else if (lights[i].type == 2) lighting += ComputeLightSpot(lights[i], n, v, spec);
+ }
+ }
+
+ // Calculate final fragment color
+ finalColor = vec4(texelColor.rgb*lighting*colDiffuse.rgb, texelColor.a*colDiffuse.a);
+}