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Code Issues 156 Wiki Activity

Cull lights into clusters in a compute pass

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Hirek
2026-10-15 15:21:21 +02:00
parent f85cf5fe52
commit 6aa6e505e8
8 changed files with 368 additions and 48 deletions
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44
gl/cluster_grid.h
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@@ -1,7 +1,12 @@
#pragma once
#include <array>
#include <memory>
#include <optional>
#include <glm/glm.hpp>
#include "fence.h"
#include "ssbo.h"
#include "ubo.h"
#include "shader.h"
@@ -19,7 +24,21 @@ namespace gl
class cluster_grid
{
public:
// what the culling pass reports about a frame
struct cull_stats
{
// entries of the shared index list in use
uint32_t index_count = 0;
// (cluster, light) pairs dropped because the cluster was full
uint32_t overflow_count = 0;
// highest overflow_count seen since the grid was created
uint32_t overflow_peak = 0;
};
cluster_grid();
~cluster_grid();
cluster_grid(const cluster_grid &) = delete;
cluster_grid &operator=(const cluster_grid &) = delete;
void bind();
@@ -29,6 +48,11 @@ namespace gl
// recomputes the boxes of the clusters in view space with the program made from cluster_build.comp.
// binds the grid, and leaves the boxes ready to be read by the compute passes which follow
void build(program &build_program);
// assigns the lights of light_ssbo to the clusters with the program made from cluster_cull.comp: zeroes the
// counters, fills the (offset, count) of every cluster and the index list, and leaves them ready to be
// read by the shading and the debug view which follow. the boxes have to be current (update(), build()) and the
// grid valid. also queues the counters for reading back, see stats()
void cull(program &cull_program);
// false if the last update found no grid possible for the pass (orthographic projection)
bool valid() const
@@ -39,6 +63,12 @@ namespace gl
{
return m_params;
}
// counters of the most recent culling pass whose result has reached the cpu, which takes a few frames
// (read back without waiting for the gpu); empty until there is one
std::optional<cull_stats> stats() const
{
return m_stats;
}
private:
// cluster_aabb per cluster
@@ -53,5 +83,19 @@ namespace gl
cluster_ubs m_params{};
bool m_boxes_stale = true;
// counters copied for reading back: a queue of buffers, each with the fence of the copy into it
static constexpr size_t READBACK_SLOTS = 4;
struct readback_slot
{
GLuint buffer = 0;
std::unique_ptr<fence> copied;
};
void collect_stats();
std::array<readback_slot, READBACK_SLOTS> m_readback;
// oldest slot in use and the number of slots in use
size_t m_readback_first = 0;
size_t m_readback_used = 0;
std::optional<cull_stats> m_stats;
};
} // namespace gl