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#version 100
precision mediump float;
// Input vertex attributes (from vertex shader)
varying vec3 fragPosition;
varying vec2 fragTexCoord;
varying vec4 fragColor;
varying vec3 fragNormal;
// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;
// NOTE: Add your custom variables here
#define MAX_LIGHTS 4
#define LIGHT_DIRECTIONAL 0
#define LIGHT_POINT 1
struct Light {
int enabled;
int type;
vec3 position;
vec3 target;
vec4 color;
};
// Input lighting values
uniform Light lights[MAX_LIGHTS];
uniform vec4 ambient;
uniform vec3 viewPos;
void main()
{
// Texel color fetching from texture sampler
vec4 texelColor = texture2D(texture0, fragTexCoord);
vec3 lightDot = vec3(0.0);
vec3 normal = normalize(fragNormal);
vec3 viewD = normalize(viewPos - fragPosition);
vec3 specular = vec3(0.0);
vec4 tint = colDiffuse * fragColor;
// NOTE: Implement here your fragment shader code
for (int i = 0; i < MAX_LIGHTS; i++)
{
if (lights[i].enabled == 1)
{
vec3 light = vec3(0.0);
if (lights[i].type == LIGHT_DIRECTIONAL)
{
light = -normalize(lights[i].target - lights[i].position);
}
if (lights[i].type == LIGHT_POINT)
{
light = normalize(lights[i].position - fragPosition);
}
float NdotL = max(dot(normal, light), 0.0);
lightDot += lights[i].color.rgb*NdotL;
float specCo = 0.0;
if (NdotL > 0.0) specCo = pow(max(0.0, dot(viewD, reflect(-(light), normal))), 16.0); // 16 refers to shine
specular += specCo;
}
}
vec4 finalColor = (texelColor*((tint + vec4(specular, 1.0))*vec4(lightDot, 1.0)));
finalColor += texelColor*(ambient/10.0);
// Gamma correction
gl_FragColor = pow(finalColor, vec4(1.0/2.2));
}
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