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/* -------------------------------------------------------------------- */
/** \name Tile indirection packing
* \{ */
#define MotionPayload uint
/* Store velocity magnitude in the MSB to be able to use it with atomicMax operations. */
MotionPayload motion_blur_tile_indirection_pack_payload(vec2 motion, uvec2 payload)
{
/* NOTE: Clamp to 16383 pixel velocity. After that, it is tile position that determine the tile
* to dilate over. */
uint velocity = min(uint(ceil(length(motion))), 0x3FFFu);
/* Designed for 512x512 tiles max. */
return (velocity << 18u) | ((payload.x & 0x1FFu) << 9u) | (payload.y & 0x1FFu);
}
/* Return thread index. */
ivec2 motion_blur_tile_indirection_pack_payload(uint data)
{
return ivec2((data >> 9u) & 0x1FFu, data & 0x1FFu);
}
uint motion_blur_tile_indirection_index(uint motion_step, uvec2 tile)
{
uint index = tile.x;
index += tile.y * MOTION_BLUR_MAX_TILE;
index += motion_step * MOTION_BLUR_MAX_TILE * MOTION_BLUR_MAX_TILE;
return index;
}
#define MOTION_PREV 0u
#define MOTION_NEXT 1u
#define motion_blur_tile_indirection_store(table_, step_, tile, payload_) \
if (true) { \
uint index = motion_blur_tile_indirection_index(step_, tile); \
atomicMax(table_[index], payload_); \
}
#define motion_blur_tile_indirection_load(table_, step_, tile_, result_) \
if (true) { \
uint index = motion_blur_tile_indirection_index(step_, tile_); \
result_ = motion_blur_tile_indirection_pack_payload(table_[index]); \
}
/** \} */
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