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Code Issues 150 Wiki Activity

Cull and assign LOD to instances in a compute pass

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Hirek
2026-10-16 01:08:44 +02:00
parent 9277c28805
commit 4d3a401aae
14 changed files with 805 additions and 6 deletions
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9
gl/glsl_common.cpp
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@@ -15,6 +15,15 @@ void gl::glsl_common_setup()
"#define MAX_CASCADES " + std::to_string(MAX_CASCADES) + "U\n" +
"#define MAX_PARAMS " + std::to_string(MAX_PARAMS) + "U\n" +
"#define INSTANCE_SSBO_BINDING " + std::to_string(INSTANCE_SSBO_BINDING) + "\n" +
"#define INSTANCE_RECORD_SSBO_BINDING " + std::to_string(INSTANCE_RECORD_SSBO_BINDING) + "\n" +
"#define INSTANCE_JOB_SSBO_BINDING " + std::to_string(INSTANCE_JOB_SSBO_BINDING) + "\n" +
"#define INSTANCE_GROUP_SSBO_BINDING " + std::to_string(INSTANCE_GROUP_SSBO_BINDING) + "\n" +
"#define INSTANCE_LOD_SSBO_BINDING " + std::to_string(INSTANCE_LOD_SSBO_BINDING) + "\n" +
"#define INSTANCE_COUNTER_SSBO_BINDING " + std::to_string(INSTANCE_COUNTER_SSBO_BINDING) + "\n" +
"#define INSTANCE_OUTPUT_SSBO_BINDING " + std::to_string(INSTANCE_OUTPUT_SSBO_BINDING) + "\n" +
"#define INSTANCE_CULL_GROUP_SIZE " + std::to_string(INSTANCE_CULL_GROUP_SIZE) + "\n" +
"#define INSTANCE_OFFSETS_GROUP_SIZE " + std::to_string(INSTANCE_OFFSETS_GROUP_SIZE) + "\n" +
"#define INSTANCE_COUNTER_HEADER " + std::to_string(INSTANCE_COUNTER_HEADER) + "\n" +
"#define LIGHT_SSBO_BINDING " + std::to_string(LIGHT_SSBO_BINDING) + "\n" +
"#define CLUSTER_GRID_X " + std::to_string(CLUSTER_GRID_X) + "\n" +
"#define CLUSTER_GRID_Y " + std::to_string(CLUSTER_GRID_Y) + "\n" +

39
gl/ubo.h
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@@ -374,5 +374,44 @@ namespace gl
static_assert(sizeof(atmosphere_result) == 16 * (SKY_SH_COEFFICIENTS + 4), "bad size of atmosphere_result");
// culling of model instances in compute passes (instance_cull.comp, instance_cull_offsets.comp). binding points of
// the shader storage blocks, apart from the ones bound for the shading so the passes don't disturb them
const GLuint INSTANCE_RECORD_SSBO_BINDING = 9; // scene::basic_cell::instance_record of the queued buckets
const GLuint INSTANCE_JOB_SSBO_BINDING = 10; // instance_cull_job, one per queued bucket
const GLuint INSTANCE_GROUP_SSBO_BINDING = 11; // instance_cull_group, one per model and skins
const GLuint INSTANCE_LOD_SSBO_BINDING = 12; // sorted lod bounds (squared distances) of the groups
const GLuint INSTANCE_COUNTER_SSBO_BINDING = 13; // header, then count[entries] and cursor[entries]
const GLuint INSTANCE_OUTPUT_SSBO_BINDING = 14; // modelview matrices of the instances which passed, by entry
const GLuint INSTANCE_CULL_GROUP_SIZE = 64;
const GLuint INSTANCE_OFFSETS_GROUP_SIZE = 1024;
// uints of the header of the counter buffer: frame number, survivors in total, entries, unused.
// an entry is a lod band of a group: survivors of group g in band b are counted at entry entryfirst(g) + b
const GLuint INSTANCE_COUNTER_HEADER = 4;
// layout std430: a bucket of a scene cell queued in the pass (GLSL: instance_cull_job)
struct instance_cull_job
{
packed_vec3 origin; // origin of the records of the bucket, relative to the camera of the pass
uint32_t first; // first record of the bucket in the record buffer
packed_vec3 distanceorigin; // the same origin, relative to the camera the distance is measured from
uint32_t count; // records of the bucket
uint32_t group;
uint32_t candidatestart; // records of the jobs before this one
uint32_t pad[2];
};
static_assert(sizeof(instance_cull_job) == 48, "bad size of instance_cull_job");
// layout std430: instances of one model with one set of skins, the unit drawn together (GLSL: instance_cull_group)
struct instance_cull_group
{
uint32_t lodfirst; // first bound in the lod buffer
uint32_t lodcount; // bounds; the group has lodcount + 1 bands
uint32_t entryfirst; // first entry of the counters
uint32_t pad;
};
static_assert(sizeof(instance_cull_group) == 16, "bad size of instance_cull_group");
#pragma pack(pop)
}