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Code Issues 150 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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18
gl/ubo.h
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@@ -156,22 +156,26 @@ namespace gl
static_assert(offsetof(light_element, headlight_projection) == 64, "bad layout of light_element");
static_assert(offsetof(light_element, headlight_weights) == 128, "bad layout of light_element");
// capacity of light_data.lights; slot 0 is the sun
const size_t MAX_LIGHTS = 8;
// capacity of light_data.lights; slot 0 is the sun. a buffer size, not a limit of the shaders: they take the
// number of lights from the header
const size_t MAX_LIGHTS = 256;
// contents of light_ssbo: global lighting header followed by the light array
struct light_data
{
packed_vec3 ambient;
UBS_PAD(4);
// number of lights stored in lights[] (the sun included): what the light clusters are culled from
uint32_t lights_total;
packed_vec3 fog_color;
// number of lights (the sun included) the shading loop over lights[] goes through
uint32_t lights_count;
light_element lights[MAX_LIGHTS];
};
static_assert(offsetof(light_data, ambient) == 0, "bad layout of light_data");
static_assert(offsetof(light_data, lights_total) == 12, "bad layout of light_data");
static_assert(offsetof(light_data, fog_color) == 16, "bad layout of light_data");
static_assert(offsetof(light_data, lights_count) == 28, "bad layout of light_data");
static_assert(offsetof(light_data, lights) == 32, "bad layout of light_data");
@@ -186,8 +190,9 @@ namespace gl
const GLuint CLUSTER_COUNT = CLUSTER_GRID_X * CLUSTER_GRID_Y * CLUSTER_GRID_Z;
// capacity of the light list of a single cluster
const GLuint MAX_LIGHTS_PER_CLUSTER = 64;
// work group size of cluster_build.comp, which handles one cluster per invocation
// work group size of cluster_build.comp and cluster_cull.comp, which handle one cluster per invocation
const GLuint CLUSTER_BUILD_GROUP_SIZE = 64;
const GLuint CLUSTER_CULL_GROUP_SIZE = 64;
// binding points of the cluster buffers: layout(binding = ...) in glsl_common.
// the uniform block numbers go together with scene (0), model (1) and instance (3) blocks
@@ -247,8 +252,9 @@ namespace gl
static_assert(offsetof(cluster_range, offset) == 0, "bad layout of cluster_range");
static_assert(offsetof(cluster_range, count) == 4, "bad layout of cluster_range");
// layout std430: cluster_counter_ssbo. index_count is the allocator of the shared index list, overflow_count
// the number of lights dropped from clusters which were full
// layout std430: cluster_counter_ssbo, zeroed before every culling pass. index_count is the allocator of the shared
// index list, overflow_count the number of (cluster, light) pairs dropped because the cluster already held
// MAX_LIGHTS_PER_CLUSTER lights
struct cluster_counters
{
uint32_t index_count;