#version 460

layout(packed, binding=0) buffer model_list {
	mat4 models[];
};
in vec3 in_vertex;
in vec3 in_normal;
in vec2 in_texcoord;
uniform mat4 mvp;
uniform float factor;
out vec2 f_texcoord;
out vec3 light;

void main(void) {
//	gl_Position = mvp * models[gl_InstanceID] * vec4(in_vertex + (clamp(factor, 0, 1) * in_normal), 1.0);
	gl_Position = mvp * models[gl_InstanceID] * vec4(in_vertex, 1.0);

	// This ONLY works because we have a sphere!
	vec3 normal = (models[gl_InstanceID] * vec4(in_normal, 0)).xyz;

	// This is the diffuse color AND the ambient color
	// They don't have to be the same
	vec3 material = vec3(1, 1, 1);
	
	vec3 light_position = vec3(0, 0, (10 * factor));
	vec3 Direction = -1 * (gl_Position.xyz - light_position); // Light direction
	vec3 I = vec3(1, 1, 1); // Light Intensity
	vec3 R = material * I * clamp(dot(normalize(Direction), normalize(normal)), 0, 1);

//	vec3 Direction2 = vec3(10, -5, 3); // Light direction
//	vec3 I2 = vec3(.3, .3, .9); // Light Intensity
	// If you don't use clamp, then you can do this instead
//	float dp =  dot(normalize(Direction2), normalize(normal));
//	if(dp < 0)
//		dp = 0;
//	vec3 R2 = material * I2 * dp;
	
	vec3 A = material * vec3(.2, .2, .2);
	
	light = R + A;
	f_texcoord = in_texcoord;
}