4rfxvK21.txt

local SHADER = {      
	shared = {
		uniform = {
			time = 0,
		},
	},
	 
	vertex = { 
		uniform = {
			camera_matrix = "mat4",
			model_matrix = "mat4",
		},			
		attributes = {
			{pos = "vec3"},
			{normal = "vec3"},
			{uv = "vec2"},
		},	
		source = [[
			void main()
			{				
				// if this is commented out, the normal is just 
				// passed onto the fragment shader as it is
					
				/*
					mat3 world_inverse = transpose(mat3(camera_matrix));
					mat3 normal_matrix = transpose(inverse(mat3(model_matrix)));
					glw_out_normal = normalize(world_inverse * normal_matrix * normal);
				*/
				
				gl_Position = camera_matrix * model_matrix * vec4(pos, 1.0);
			}
		]]
	},
	
	fragment = { 
		uniform = {
			diffuse = "sampler2D",
			bump = "sampler2D",
			specular = "sampler2D",
		},		
		attributes = {
			pos = "vec3",
			normal = "vec3",
			uv = "vec2",
		},			
		source = [[
			out vec4 out_data[4];
			
			void main() 
			{
				out_data[0] = texture2D(diffuse, uv);
				out_data[1] = vec4(normalize(normal.xyz + texture2D(bump, uv).xyz), 1);
				out_data[2] = vec4(pos.xyz, 1);	
				out_data[3] = texture2D(specular, uv);
			}
		]]
	}  
}