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Code Issues 152 Wiki Activity

Simulate and light the smoke on the GPU and make rain and snow of particles

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This commit is contained in:
Hirek
2026-10-20 16:44:27 +02:00
parent 6a109e984c
commit 867497b658
22 changed files with 1637 additions and 13 deletions
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6
gl/glsl_common.cpp
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@@ -29,6 +29,12 @@ void gl::glsl_common_setup()
"#define HIZ_GROUP_SIZE " + std::to_string(HIZ_GROUP_SIZE) + "\n" +
"#define SHADOW_FIT_GROUP_SIZE " + std::to_string(SHADOW_FIT_GROUP_SIZE) + "\n" +
"#define SHADOW_FIT_SSBO_BINDING " + std::to_string(SHADOW_FIT_SSBO_BINDING) + "\n" +
"#define PARTICLE_GROUP_SIZE " + std::to_string(PARTICLE_GROUP_SIZE) + "\n" +
"#define PARTICLE_SSBO_BINDING " + std::to_string(PARTICLE_SSBO_BINDING) + "\n" +
"#define PARTICLE_SOURCE_SSBO_BINDING " + std::to_string(PARTICLE_SOURCE_SSBO_BINDING) + "\n" +
"#define PARTICLE_OWNER_SSBO_BINDING " + std::to_string(PARTICLE_OWNER_SSBO_BINDING) + "\n" +
"#define PARTICLE_OUTPUT_SSBO_BINDING " + std::to_string(PARTICLE_OUTPUT_SSBO_BINDING) + "\n" +
"#define PARTICLE_COMMAND_SSBO_BINDING " + std::to_string(PARTICLE_COMMAND_SSBO_BINDING) + "\n" +
"#define INSTANCE_COUNTER_HEADER " + std::to_string(INSTANCE_COUNTER_HEADER) + "\n" +
"#define INSTANCE_JOB_SLEEPERS " + std::to_string(INSTANCE_JOB_SLEEPERS) + "U\n" +
"#define LIGHT_SSBO_BINDING " + std::to_string(LIGHT_SSBO_BINDING) + "\n" +

44
gl/ubo.h
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@@ -496,6 +496,50 @@ namespace gl
const GLuint SHADOW_FIT_GROUP_SIZE = 16;
const GLuint SHADOW_FIT_SSBO_BINDING = 9;
// the particles of the gpu (opengl46_gpu_particles, particles_*.comp, particle_common.glsl): work group of their passes and the
// binding points of their buffers. the points are ones of the instance culling, which binds its buffers before every use; the
// particles bind their own before their passes. the draws read the particles as attributes of instances, not from storage
const GLuint PARTICLE_GROUP_SIZE = 64;
const GLuint PARTICLE_SSBO_BINDING = 9; // the smoke particles
const GLuint PARTICLE_SOURCE_SSBO_BINDING = 10; // their sources, as the last update of the simulation left them
const GLuint PARTICLE_OWNER_SSBO_BINDING = 11; // the source of every place of the particles
const GLuint PARTICLE_OUTPUT_SSBO_BINDING = 12; // what the draw reads, a particle_draw per particle drawn
const GLuint PARTICLE_COMMAND_SSBO_BINDING = 13; // the indirect draw command, whose instances the passes count
// layout std430: GLSL smoke_particle_s
struct particle_smoke
{
glm::vec4 position;
glm::vec4 velocity;
glm::vec4 state;
};
static_assert(sizeof(particle_smoke) == 48, "bad size of particle_smoke");
// layout std430: GLSL smoke_source_s
struct particle_smoke_source
{
glm::uvec4 pool;
glm::vec4 location;
glm::vec4 previous;
glm::vec4 launch;
glm::vec4 initial;
glm::vec4 sizechange;
glm::vec4 opacitychange;
glm::vec4 motion;
glm::vec4 color;
glm::vec4 oldcolor;
};
static_assert(sizeof(particle_smoke_source) == 160, "bad size of particle_smoke_source");
// layout std430: GLSL particle_draw_s, read by the draws as attributes of instances
struct particle_draw
{
glm::vec4 place;
glm::vec4 shape;
glm::vec4 color;
};
static_assert(sizeof(particle_draw) == 48, "bad size of particle_draw");
// layout std430: a bucket of a scene cell queued in the pass (GLSL: instance_cull_job)
struct instance_cull_job
{