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EEVEE-Next: Shadow: Add LOD system to directional clipmap shadows #120031

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Clément Foucault merged 16 commits from fclem/blender:eevee-next-shadow-directional-lod into main 2024-03-29 16:23:06 +01:00
Conversation 0 Commits 16 Files Changed 15 +3 -2
1 changed files with 3 additions and 2 deletions
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5
source/blender/draw/engines/eevee_next/shaders/eevee_shadow_tracing_lib.glsl
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@ -23,6 +23,7 @@ float shadow_read_depth_at_tilemap_uv(int tilemap_index, vec2 tilemap_uv)
ivec2 texel_coord = ivec2(tilemap_uv * float(SHADOW_MAP_MAX_RES));
/* Using bitwise ops is way faster than integer ops. */
const int page_shift = SHADOW_PAGE_LOD;
const int page_mask = ~(0xFFFFFFFF << SHADOW_PAGE_LOD);
ivec2 tile_coord = texel_coord >> page_shift;
ShadowSamplingTile tile = shadow_tile_load(shadow_tilemaps_tx, tile_coord, tilemap_index);
@ -31,8 +32,8 @@ float shadow_read_depth_at_tilemap_uv(int tilemap_index, vec2 tilemap_uv)
return -1.0;
}
int page_mask = ~(0xFFFFFFFF << (SHADOW_PAGE_LOD + int(tile.lod)));
ivec2 texel_page = (texel_coord & page_mask) >> int(tile.lod);
/* Scale to LOD pixels (merge LOD0 pixels together) then mask to get pixel in page. */
ivec2 texel_page = (texel_coord >> int(tile.lod)) & page_mask;
ivec3 texel = ivec3((ivec2(tile.page.xy) << page_shift) | texel_page, tile.page.z);
return uintBitsToFloat(texelFetch(shadow_atlas_tx, texel, 0).r);