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/**
* Virtual shadowmapping: Free pages.
*
* Scan all tilemaps and add all free pages inside the free page heap.
*/
#pragma BLENDER_REQUIRE(common_view_lib.glsl)
#pragma BLENDER_REQUIRE(common_math_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_shadow_page_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_shadow_tilemap_lib.glsl)
void main()
{
ShadowTileMapData tilemap_data = tilemaps_buf[gl_GlobalInvocationID.z];
ivec2 tile_co = ivec2(gl_GlobalInvocationID.xy);
int tilemap_idx = tilemap_data.index;
int lod_max = tilemap_data.is_cubeface ? SHADOW_TILEMAP_LOD : 0;
for (int lod = 0; lod <= lod_max; lod++) {
uint lod_size = SHADOW_TILEMAP_RES >> lod;
if (any(greaterThanEqual(tile_co, ivec2(lod_size)))) {
continue;
}
ivec2 texel = shadow_tile_coord_in_atlas(tile_co, tilemap_idx, lod);
ShadowTileData tile = shadow_tile_data_unpack(imageLoad(tilemaps_img, texel).x);
if (tile.is_allocated) {
if (tile.is_visible && tile.is_used && tile.is_cached) {
/* Try to recover cached tiles. Update flag is kept untouched as content might be valid. */
pages_free_buf[tile.free_page_owner_index] = uint(-1);
tile.is_cached = false;
tile.free_page_owner_index = uint(-1);
imageStore(tilemaps_img, texel, uvec4(shadow_tile_data_pack(tile)));
}
else if ((!tile.is_visible || !tile.is_used) && !tile.is_cached) {
/* Push page to the free page heap. */
int free_index = atomicAdd(pages_infos_buf.page_free_next, 1) + 1;
if (free_index < SHADOW_MAX_PAGE) {
pages_free_buf[free_index] = packUvec2x16(uvec2(texel));
tile.is_cached = true;
tile.free_page_owner_index = uint(free_index);
imageStore(tilemaps_img, texel, uvec4(shadow_tile_data_pack(tile)));
}
else {
/* Well, this should never happen. This would mean some pages were marked
* for deletion multiple times. */
}
}
}
}
}
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