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/**
* Virtual shadowmapping: Debug pages.
*
* Since pages are only existing if they are attached to a tilemap or the free list,
* this shader will scan every possible position and create a debug map out of it.
* This is nice to inspect the state of the page allocation during the pipeline.
*/
#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)
/* Use this as custom channel viewer in renderdoc to inspect debug_img. */
#if 0
layout(binding = 2) uniform usampler2D texUInt2D;
in vec2 uv;
out vec4 color_out;
void main()
{
uint page = texture(texUInt2D, uv).x;
bool error = (page & 0xFFFFu) != 1u;
bool is_cached = (page & SHADOW_PAGE_IS_CACHED) != 0u;
bool is_needed = (page & SHADOW_PAGE_IS_NEEDED) != 0u;
bool in_heap = (page & SHADOW_PAGE_IN_FREE_HEAP) != 0u;
error = error || (is_cached && !in_heap);
error = error || (is_needed && is_cached);
color_out = vec4(error, is_cached, is_needed, in_heap);
}
#endif
void main()
{
for (int y = 0; y < imageSize(debug_img).y / int(gl_WorkGroupSize.y); y++) {
for (int x = 0; x < imageSize(debug_img).x / int(gl_WorkGroupSize.x); x++) {
ivec2 co = ivec2(x, y) * ivec2(gl_WorkGroupSize.xy) + ivec2(gl_LocalInvocationID.xy);
imageStore(debug_img, co, uvec4(0));
}
}
barrier();
/* TODO(fclem): We only scan the first line of tilemap, otherwise it is too slow.
* Finish and do it properly one day... */
for (int y = 0; y < imageSize(tilemaps_img).y / int(gl_WorkGroupSize.y); y++) {
for (int x = 0; x < imageSize(tilemaps_img).x / int(gl_WorkGroupSize.x); x++) {
ivec2 co = ivec2(x, y) * ivec2(gl_WorkGroupSize.xy) + ivec2(gl_LocalInvocationID.xy);
ShadowTileData tile = shadow_tile_data_unpack(imageLoad(tilemaps_img, co).x);
if (tile.is_allocated) {
/* User count. */
imageAtomicAdd(debug_img, ivec2(tile.page), 1u);
}
}
}
barrier();
for (int y = 0; y < imageSize(tilemaps_img).y / int(gl_WorkGroupSize.y); y++) {
for (int x = 0; x < imageSize(tilemaps_img).x / int(gl_WorkGroupSize.x); x++) {
ivec2 co = ivec2(x, y) * ivec2(gl_WorkGroupSize.xy) + ivec2(gl_LocalInvocationID.xy);
ShadowTileData tile = shadow_tile_data_unpack(imageLoad(tilemaps_img, co).x);
if (tile.is_allocated) {
imageAtomicOr(debug_img, ivec2(tile.page), SHADOW_PAGE_ALLOCATED);
if (tile.is_cached) {
imageAtomicOr(debug_img, ivec2(tile.page), SHADOW_PAGE_IS_CACHED);
/* Verify reference. */
ivec2 ref = ivec2(unpackUvec2x16(pages_free_buf[tile.free_page_owner_index]));
if (ref == co) {
imageAtomicOr(debug_img, ivec2(tile.page), SHADOW_PAGE_IN_FREE_HEAP);
}
}
if (tile.is_used && tile.is_visible) {
imageAtomicOr(debug_img, ivec2(tile.page), SHADOW_PAGE_IS_NEEDED);
}
if (tile.do_update) {
imageAtomicOr(debug_img, ivec2(tile.page), SHADOW_PAGE_DO_UPDATE);
}
}
}
}
#if 0
for (int x = 0; x < SHADOW_MAX_PAGE; x++) {
if (pages_free_buf[x] != uint(-1)) {
uvec2 owner = unpackUvec2x16(pages_free_buf[x]);
uvec2 page = shadow_tile_data_unpack(imageLoad(tilemaps_img, ivec2(owner)).x).page;
/* User count. */
imageAtomicAdd(debug_img, ivec2(page), 1u);
imageAtomicOr(debug_img, ivec2(page), SHADOW_PAGE_IN_FREE_HEAP);
}
}
#endif
}
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