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Code Issues 150 Wiki Activity

Move light data from UBO to std430 SSBO

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Hirek
2026-10-15 13:20:59 +02:00
parent 677a96c293
commit c0f45184b8
5 changed files with 74 additions and 43 deletions
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38
gl/ubo.h
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@@ -4,6 +4,7 @@
#include "bindable.h"
#include "buffer.h"
#include <glm/glm.hpp>
#include <cstddef>
#define UBS_PAD(x) uint8_t PAD[x]
@@ -103,7 +104,14 @@ namespace gl
static_assert(sizeof(instance_ubs) == 64 * MAX_INSTANCES_PER_BATCH, "bad size of instance_ubs");
struct light_element_ubs
// layout std430 (shader storage buffers)
// structs must match with GLSL, offsets checked below
// binding points of the shader storage blocks: layout(std430, binding = ...) in glsl_common
const GLuint LIGHT_SSBO_BINDING = 0;
// one light source, element of light_ssbo.lights[] (GLSL: light_s)
struct light_element
{
enum type_e
{
@@ -132,11 +140,27 @@ namespace gl
glm::vec4 headlight_weights;
};
static_assert(sizeof(light_element_ubs) == 144, "bad size of ubs");
// std430 array stride of a struct is its size rounded up to its alignment (16, from mat4/vec4)
static_assert(sizeof(light_element) == 144, "bad size of light_element");
static_assert(sizeof(light_element) % 16 == 0, "light_element must be a whole std430 array stride");
static_assert(offsetof(light_element, pos) == 0, "bad layout of light_element");
static_assert(offsetof(light_element, type) == 12, "bad layout of light_element");
static_assert(offsetof(light_element, dir) == 16, "bad layout of light_element");
static_assert(offsetof(light_element, in_cutoff) == 28, "bad layout of light_element");
static_assert(offsetof(light_element, color) == 32, "bad layout of light_element");
static_assert(offsetof(light_element, out_cutoff) == 44, "bad layout of light_element");
static_assert(offsetof(light_element, linear) == 48, "bad layout of light_element");
static_assert(offsetof(light_element, quadratic) == 52, "bad layout of light_element");
static_assert(offsetof(light_element, intensity) == 56, "bad layout of light_element");
static_assert(offsetof(light_element, ambient) == 60, "bad layout of light_element");
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;
struct light_ubs
// contents of light_ssbo: global lighting header followed by the light array
struct light_data
{
packed_vec3 ambient;
UBS_PAD(4);
@@ -144,10 +168,14 @@ namespace gl
packed_vec3 fog_color;
uint32_t lights_count;
light_element_ubs lights[MAX_LIGHTS];
light_element lights[MAX_LIGHTS];
};
static_assert(sizeof(light_ubs) == 32 + sizeof(light_element_ubs) * MAX_LIGHTS, "bad size of ubs");
static_assert(offsetof(light_data, ambient) == 0, "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");
#pragma pack(pop)
}