#version 450
layout(local_size_x = 8, local_size_y = 8) in;
layout(set = 0, binding = 0, r32ui) uniform uimage2D uFramebuffer;
layout(set = 0, binding = 1) uniform usamplerBuffer uImage;

layout(push_constant, std430) uniform Rect
{
    uvec2 offset;
    uvec2 extent;
    uint view_offset;
    uint mask_or;
} rect;

void main()
{
    if (all(lessThan(gl_GlobalInvocationID.xy, rect.extent)))
    {
        uint value = texelFetch(uImage,
             int(rect.view_offset + rect.extent.x * gl_GlobalInvocationID.y + gl_GlobalInvocationID.x)).x;
        uvec2 coord = (gl_GlobalInvocationID.xy + rect.offset) & uvec2(1023u, 511u);
#ifdef MASKED
        uint fbvalue = imageLoad(uFramebuffer, ivec2(coord)).x;
        if ((fbvalue & 0x8000u) == 0u)
            imageStore(uFramebuffer, ivec2(coord), uvec4(value | rect.mask_or));
#else
        imageStore(uFramebuffer, ivec2(coord), uvec4(value | rect.mask_or));
#endif
    }
}