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Code Issues 156 Wiki Activity

Use clustered light lists in forward shading

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Hirek
2026-10-15 16:16:53 +02:00
parent 6aa6e505e8
commit 9f2ae071a6
9 changed files with 117 additions and 51 deletions
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4
gl/glsl_common.cpp
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@@ -64,8 +64,10 @@ void gl::glsl_common_setup()
uint lights_total;
vec3 fog_color;
// lights the shading loop goes through
// lights the shading loop goes through when the lights are not clustered
uint lights_count;
// 1 if the shading takes the lights from the list of the cluster of a fragment, see cluster_ubo
uint lights_clustered;
light_s lights[];
};

12
gl/ubo.h
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@@ -168,8 +168,13 @@ namespace gl
uint32_t lights_total;
packed_vec3 fog_color;
// number of lights (the sun included) the shading loop over lights[] goes through
// number of lights (the sun included) the shading loop over lights[] goes through when the lights are not clustered
uint32_t lights_count;
// 1 if the shading takes the lights of a fragment from the list of its cluster (lights_count is not used then), 0 if not.
// set per pass: the cluster grid exists only for the color pass of a perspective view
uint32_t lights_clustered;
// lights[] begins at a multiple of 16 bytes
uint32_t padding[3];
light_element lights[MAX_LIGHTS];
};
@@ -178,8 +183,9 @@ namespace gl
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");
static_assert(sizeof(light_data) == 32 + sizeof(light_element) * MAX_LIGHTS, "bad size of light_data");
static_assert(offsetof(light_data, lights_clustered) == 32, "bad layout of light_data");
static_assert(offsetof(light_data, lights) == 48, "bad layout of light_data");
static_assert(sizeof(light_data) == 48 + sizeof(light_element) * MAX_LIGHTS, "bad size of light_data");
// light clusters (see gl/cluster_grid.h): the view frustum is cut into CLUSTER_GRID_X x CLUSTER_GRID_Y screen
// tiles and CLUSTER_GRID_Z depth slices, spaced exponentially between the near and far plane of the pass.