nuclear@61: uniform sampler2D mrt0, mrt1, mrt2;
nuclear@30: uniform vec2 tex_scale, fb_size;
nuclear@30: 
nuclear@33: uniform vec3 light_color;
nuclear@33: uniform float light_radius;
nuclear@33: 
nuclear@34: varying vec3 vpos, ltpos;
nuclear@29: 
nuclear@29: void main()
nuclear@29: {
nuclear@30: 	vec2 tc = gl_FragCoord.xy * tex_scale / fb_size;
nuclear@29: 
nuclear@34: 	// MRT0 - rgb: position, a: shininess
nuclear@34: 	vec4 texel0 = texture2D(mrt0, tc);
nuclear@34: 	vec3 pos = texel0.xyz;
nuclear@34: 	float shin = texel0.w;
nuclear@34: 
nuclear@34: 	// MRT1 - rgb: normal
nuclear@30: 	vec3 norm = texture2D(mrt1, tc).xyz;
nuclear@30: 
nuclear@34: 	// MRT2 - rgb: diffuse color, a: specular intensity
nuclear@30: 	vec4 texel3 = texture2D(mrt2, tc);
nuclear@30: 	vec3 dcol = texel3.xyz;
nuclear@34: 	vec3 scol = texel3.www;
nuclear@30: 
nuclear@30: 	vec3 ldir = ltpos - pos;
nuclear@33: 	float light_dist = length(ldir);
nuclear@30: 	ldir = normalize(ldir);
nuclear@30: 
nuclear@34: 	// diffuse
nuclear@34: 	float ndotl = max(dot(norm, ldir), 0.0);
nuclear@34: 	vec3 color_diffuse = dcol * ndotl;
nuclear@34: 
nuclear@34: 	// specular
nuclear@34: 	vec3 vdir = -normalize(vpos);
nuclear@34: 	vec3 halfvec = normalize(vdir + ldir);
nuclear@34: 	float ndoth = max(dot(norm, halfvec), 0.0);
nuclear@34: 	vec3 color_specular = scol * pow(ndoth, shin);
nuclear@30: 
nuclear@33: 	float atten = 1.0 - light_dist / light_radius;
nuclear@33: 	atten = clamp(atten, 0.0, 1.0);
nuclear@29: 
nuclear@34: 	vec3 color = (color_diffuse + color_specular) * light_color * atten;
nuclear@34: 	gl_FragColor = vec4(color, 1.0);
nuclear@29: }