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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(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;
# ifndef SHADOW_PAGE_IS_CACHED
# error "Do not forget to copy the falgs too"
# endif
void main()
{
uint page = texture(texUInt2D, uv).x;
uint user_count = page & 0xFFFFu;
bool is_cached = (page & SHADOW_PAGE_IS_CACHED) != 0u;
bool is_free = (page & SHADOW_PAGE_IS_FREE) != 0u;
bool is_used = (page & SHADOW_PAGE_IS_USED) != 0u;
bool in_cache_heap = (page & SHADOW_PAGE_IN_CACHE_HEAP) != 0u;
const uint all_states = (SHADOW_PAGE_IS_CACHED | SHADOW_PAGE_IS_FREE | SHADOW_PAGE_IS_USED);
vec3 col;
if (bitCount(page & all_states) != 1) {
col = vec3(1, 0, 0);
}
else if (is_cached && !in_cache_heap) {
col = vec3(1, 0, 0);
}
else if (user_count != 1u) {
col = vec3(1, 0, 0);
}
else if (is_cached) {
col = vec3(1, 1, 0);
}
else if (is_used) {
col = vec3(0, 1, 0);
}
else if (is_free) {
col = vec3(0, 0.2, 1);
}
else {
/* Error: Unknown state. */
col = vec3(0);
}
color_out = vec4(col, 1.0);
}
#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();
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_IS_USED);
/* User count. */
imageAtomicAdd(debug_img, ivec2(tile.page), 1u);
}
if (tile.is_cached) {
uvec2 page = unpackUvec2x16(pages_cached_buf[tile.cache_index].x);
imageAtomicOr(debug_img, ivec2(page), SHADOW_PAGE_IS_CACHED);
}
}
}
if (gl_GlobalInvocationID == uvec3(0)) {
for (int x = 0; x < pages_infos_buf.page_free_count; x++) {
if (pages_free_buf[x] != uint(-1)) {
uvec2 page = unpackUvec2x16(pages_free_buf[x]);
imageAtomicOr(debug_img, ivec2(page), SHADOW_PAGE_IS_FREE);
/* User count. */
imageAtomicAdd(debug_img, ivec2(page), 1u);
}
}
for (int x = 0; x < SHADOW_MAX_PAGE; x++) {
if (pages_cached_buf[x].x != uint(-1)) {
uvec2 page = unpackUvec2x16(pages_cached_buf[x].x);
imageAtomicOr(debug_img, ivec2(page), SHADOW_PAGE_IN_CACHE_HEAP);
/* User count. */
imageAtomicAdd(debug_img, ivec2(page), 1u);
}
}
}
}
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