// MinecraftPT — DepthCopy_CS
// Copies the current frame depth to prevDepth2D at the end of the frame,
// so temporal filters in the next frame have the previous depth for
// reprojection validation.

#include "/Lib/Settings.glsl"
#include "/Lib/Utilities.glsl"

const ivec3 workGroups = ivec3(int(ceil(viewWidth * 0.0625)), int(ceil(viewHeight * 0.0625)), 1);
layout (local_size_x = 8, local_size_y = 8) in;

layout (r32f) uniform writeonly image2D img_prevDepth2D;

uniform sampler2D depthtex0;

void main(){
	ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
	imageStore(img_prevDepth2D, texel, vec4(texelFetch(depthtex0, texel * 2, 0).r));
}