//*PIXEL*
#version 460

#extension GL_ARB_bindless_texture : require

const uint DIRECTIONAL_LIGHT = 1;
const uint POINT_LIGHT = 2;
const uint SPOT_LIGHT = 3;
uint INVALID_HYDRA_ID = 4294967295;

struct MaterialStore
{
	vec4 diffuse_colour;	
	vec4 matalic_rough;	 
    uint diffuse_texture_id;
    uint metallic_rough_texture_id;
    uint normal_texture_id;
	uint padding[1];
};

layout(std430, binding = 2) readonly buffer material_buffer
{
	MaterialStore materials[1000];
};

layout(std430, binding = 3) readonly buffer texture_buffer 
{
    uvec2 textures[1000];
};

layout (location=0) in GEOM_OUT
{
	vec2 vsUV;
    flat uint vsMaterialID;
}geom_out;

layout (location=0) out vec4 output_colour;

void main() 
{
    MaterialStore mat = materials[geom_out.vsMaterialID];
	vec4 diffuse_val = mat.diffuse_colour;

    output_colour = vec4(1,0,0,1);
    
    if(mat.diffuse_texture_id != INVALID_HYDRA_ID)
	{
        output_colour =  vec4(0,1,0,1);
		uvec2 diffuse_handle = textures[mat.diffuse_texture_id];
		diffuse_val = diffuse_val * texture(sampler2D(diffuse_handle), geom_out.vsUV.xy);	
        if(mat.diffuse_texture_id== 10)
        {
                output_colour = vec4(0,0,1,1);
        }
	}

    if(diffuse_val[3] < 1.0)
	{
        discard;
		output_colour = vec4(0,1,1,1);
	}
    // Calculate the accurate, unclamped distance from the light source
    // output_colour = diffuse_val;
    // output_colour = vec4(geom_out.vsUV, 1,1);

}