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Code Issues 151 Wiki Activity

Build view-space light cluster grid in a compute pass

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Hirek
2026-10-15 14:16:55 +02:00
parent c0f45184b8
commit f85cf5fe52
11 changed files with 488 additions and 0 deletions
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65
gl/glsl_common.cpp
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@@ -16,6 +16,17 @@ void gl::glsl_common_setup()
"#define MAX_PARAMS " + std::to_string(MAX_PARAMS) + "U\n" +
"#define MAX_INSTANCES_PER_BATCH " + std::to_string(MAX_INSTANCES_PER_BATCH) + "U\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" +
"#define CLUSTER_GRID_Z " + std::to_string(CLUSTER_GRID_Z) + "\n" +
"#define CLUSTER_COUNT " + std::to_string(CLUSTER_COUNT) + "\n" +
"#define MAX_LIGHTS_PER_CLUSTER " + std::to_string(MAX_LIGHTS_PER_CLUSTER) + "\n" +
"#define CLUSTER_BUILD_GROUP_SIZE " + std::to_string(CLUSTER_BUILD_GROUP_SIZE) + "\n" +
"#define CLUSTER_UBO_BINDING " + std::to_string(CLUSTER_UBO_BINDING) + "\n" +
"#define CLUSTER_AABB_SSBO_BINDING " + std::to_string(CLUSTER_AABB_SSBO_BINDING) + "\n" +
"#define CLUSTER_RANGE_SSBO_BINDING " + std::to_string(CLUSTER_RANGE_SSBO_BINDING) + "\n" +
"#define CLUSTER_INDEX_SSBO_BINDING " + std::to_string(CLUSTER_INDEX_SSBO_BINDING) + "\n" +
"#define CLUSTER_COUNTER_SSBO_BINDING " + std::to_string(CLUSTER_COUNTER_SSBO_BINDING) + "\n" +
R"STRING(
const uint LIGHT_SPOT = 0U;
const uint LIGHT_POINT = 1U;
@@ -56,6 +67,60 @@ void gl::glsl_common_setup()
};
#endif
// light clusters, see gl/cluster_grid.h
struct cluster_aabb_s
{
vec4 lower;
vec4 upper;
};
struct cluster_range_s
{
uint offset;
uint count;
};
#if defined(STAGE_FRAGMENT) || defined(STAGE_COMPUTE)
// parameters of the grid for the pass being drawn
layout(std140, binding = CLUSTER_UBO_BINDING) uniform cluster_ubo
{
mat4 cluster_projection;
float cluster_znear;
float cluster_zfar;
float cluster_slice_scale;
float cluster_slice_bias;
vec2 cluster_viewport_size;
uint cluster_valid;
};
// the compute passes fill the cluster buffers, shading only reads them
#ifdef STAGE_COMPUTE
#define CLUSTER_SSBO_ACCESS
layout(std430, binding = CLUSTER_AABB_SSBO_BINDING) buffer cluster_aabb_ssbo
{
cluster_aabb_s cluster_aabbs[];
};
layout(std430, binding = CLUSTER_COUNTER_SSBO_BINDING) buffer cluster_counter_ssbo
{
uint cluster_index_count;
uint cluster_overflow_count;
};
#else
#define CLUSTER_SSBO_ACCESS readonly
#endif
layout(std430, binding = CLUSTER_RANGE_SSBO_BINDING) CLUSTER_SSBO_ACCESS buffer cluster_range_ssbo
{
cluster_range_s cluster_ranges[];
};
layout(std430, binding = CLUSTER_INDEX_SSBO_BINDING) CLUSTER_SSBO_ACCESS buffer cluster_index_ssbo
{
uint cluster_light_indices[];
};
#endif
layout (std140) uniform model_ubo
{
mat4 modelview;