Frag_m2.txt

//for using /parsing linked list 

#version 430 core

layout(binding=0, r32ui) coherent uniform uimage2D head_ptr;


struct node
{
	vec4 color;
	float depth;
	int facing;
	uint next;	
};


layout(binding=0 , std430) buffer storage
{
	node storage_arr[];

};



out vec4 color;

uint max_frag=25;

void main()
{
	uint frag_count=0;
	float net_depth=0;

	ivec2 loc = ivec2(gl_FragCoord.xy);//getting location in image

	uint i = imageLoad (head_ptr, loc ).x ; //head pointer value corrosponding to obtained location is loaded and put in i 

	while( i != 0xFFFFFFFF &&  frag_count < max_frag )//traverse list starting from index i
	{
		if(storage_arr[i].facing != 0)
		{
			net_depth-=storage_arr[i].depth;//if front facing
		}
		else
		{
			net_depth+=storage_arr[i].depth;//if backfacing
		}


		i = storage_arr[i].next;
		++frag_count;
		
	
	}


	net_depth*=300;

	if(net_depth>0.005)
	{
		color= vec4(0,net_depth,0,1);
	}
	else//for background color
	{
		color= vec4(0.3,0,0.2,1);
	}
	

}