#version 450

layout (local_size_x = 16, local_size_y = 16) in;

layout (binding = 0) readonly buffer Host
{
 uint data[];
} host;

layout (binding = 1, rgba8) uniform image2D resultImage;

layout (push_constant) uniform constants
{
 vec4  gamma;
 ivec2 pos;
} cfg;


void main()
{   
    ivec2 pixelCoords = ivec2(gl_GlobalInvocationID.xy);

    int offset = (pixelCoords.y*64)+pixelCoords.x; 

    uint pack=host.data[offset];
    
    ////const uvec4 shift = uvec4(16,8,0,24);
    ////const uvec4 mask4 = uvec4(255,255,255,255);
    
    ////uvec4 pix_int=(uvec4(pack,pack,pack,pack) >> shift) & mask4;
    
    //24,16, 8, 0
    //AA,RR,GG,BB
    
    //0,8,16,24
    //R,G, B,A
    
    //16,8,0,24
    //BGRA

    //24,0,8,16 
    //ARGB

    ////vec4 pixel = vec4(pix_int) / mask4;

    vec4 pixel=unpackUnorm4x8(pack);

    pixel=pixel.bgra;

    pixel = pow(pixel, cfg.gamma);                        

    pixelCoords = pixelCoords + cfg.pos;

    vec4 prev = imageLoad(resultImage, pixelCoords);   

    pixel.rgb = mix(prev.rgb,pixel.rgb,pixel.a);

    imageStore(resultImage, pixelCoords, pixel);
}