texture_fragmentshader.txt

#version 150

varying vec3 N;
varying vec3 v;    

uniform sampler2D color_texture;

uniform vec4 color1 = vec4(0.0, 0.0, 1.0, 1.0);
uniform vec4 color2 = vec4(0.3, 0.7, 0.5, 1.0);
 
out vec4 colorOut;

float max(float x, float y){
	if(x > y)
		return x;
	else
		return y;
}
void main (void)  
{  

   //Ross: Here's a hint on how to get the light source position
   vec3 light = gl_LightSource[0].position.xyz;   
   vec3 L = normalize(light - vec3(v.x, v.y, v.z));
   
   //Ross: V is the view direction vector and we are in Eye Coordinates, so EyePos is (0,0,0)  
   vec3 V = normalize(vec3(-v.x, -v.y, -v.z));
   
   vec4 amb = gl_FrontLightProduct[0].ambient;
   amb = clamp(amb, 0.0, 1.0);
   //calculate Diffuse Term:  
   vec4 dif = max( dot(L, N), 0.0) * gl_FrontLightProduct[0].diffuse;
   dif = clamp(dif, 0.0, 1.0);
   //calculate Specular Term:
   float alpha = gl_FrontMaterial.shininess;
   vec3 R = normalize(2 * dot(L, N) * N - L);
   vec4 spec = pow( max(dot(V, R), 0.0), alpha) * gl_FrontLightProduct[0].specular;
   spec = clamp(spec, 0.0, 1.0);
   // write Total Color:  
   //colorOut = gl_FrontLightModelProduct.sceneColor;
   vec4 color = amb + dif + spec;
   color.a = 0.6;
   //Ross: If I want to sample my texture, I need to sample it at the (s,t) coordinate of my texture coordinate
	
   vec4 texel = texture2D(color_texture, vec2(1.0, 1.0) * gl_TexCoord[0].st);  
   gl_FragColor = color + texel;
   //Ross: Generic color output is now making all geometry blue
   //colorOut = color1;


}