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#include <string.h>
#ifdef DEBUG_MEMORY
#define malloc(size) peak_debug_malloc_impl((size), __FILE__, __LINE__, __func__)
#define realloc(ptr, size) peak_debug_realloc_impl((ptr), (size), __FILE__, __LINE__, __func__)
#define free(ptr) peak_debug_free_impl((ptr), __FILE__, __LINE__, __func__)
#endif
#define PEAK_IMPLEMENTATION
#include "../Rend/rend.h"
#include "../Rend/rend.c"
#include <stddef.h>
float delta = 0;
PeakWindow win;
PeakEvent ev;
bool vsync = true;
#define PARTICLE_COUNT 1024 * 10
#define GRID_WIDTH 512
#define GRID_HEIGHT 512
typedef struct {
uint64_t particles;
uint64_t src_grid;
uint64_t dst_grid;
uint32_t particle_count;
uint32_t width;
uint32_t height;
float delta_time;
uint32_t render_mode;
} PushConstants;
typedef struct Particle {
float pos[2];
float vel[2];
} Particle;
uint32_t pcg_hash(uint32_t seed) {
uint32_t state = seed * 747796405u + 2891336453u;
uint32_t word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
return (word >> 22u) ^ word;
}
float cool_beans(uint32_t *seed) {
*seed = pcg_hash(*seed);
return (float) *seed / 4294967295.0;
}
static uint8_t *
load_spv(const char *a, const char *b, unsigned long *size)
{
uint8_t *p = peak_file_alloc(a, size);
if (p) return p;
return peak_file_alloc(b, size);
}
int main() {
if (!peak_init()) {
PFATAL("Failed to init Peak!");
return 1;
}
win = peak_window_open("demo", 800, 600, 0);
if (!win.running) {
PFATAL("Failed to open a window!");
return 1;
}
// bindless setup
RendBindingInfo bind_info = {0};
RendRenderer renderer = rend_renderer_create(&win, REND_BACKEND_AUTO, NULL, vsync, &bind_info);
if (!renderer) {
PFATAL("Failed to create renderer!");
peak_window_close(&win);
peak_quit();
return 1;
}
unsigned long particles_bytes = 0;
uint8_t *particles_shader = load_spv("particle.spv", "demos/compute/particle.spv", &particles_bytes);
unsigned long sand_bytes = 0;
uint8_t *sand_shader = load_spv("sand.spv", "demos/compute/sand.spv", &sand_bytes);
unsigned long vert_size = 0;
uint8_t *vert = load_spv("vert.spv", "demos/compute/vert.spv", &vert_size);
unsigned long frag_size = 0;
uint8_t *frag = load_spv("frag.spv", "demos/compute/frag.spv", &frag_size);
uint32_t seed = 0xC0FFEE;
Particle *initial_particles = malloc(PARTICLE_COUNT * sizeof *initial_particles);
for (int i = 0; i < PARTICLE_COUNT; i++) {
initial_particles[i].pos[0] = cool_beans(&seed) * 2.0f - 1.0f;
initial_particles[i].pos[1] = cool_beans(&seed) * 2.0f - 1.0f;
initial_particles[i].vel[0] = cool_beans(&seed) * 0.4f - 0.2f;
initial_particles[i].vel[1] = cool_beans(&seed) * 0.4f - 0.2f;
}
size_t buffer_size = PARTICLE_COUNT * sizeof(Particle);
RendBuffer particle_buf = rend_buffer_create(renderer, buffer_size, REND_BUFFER_STORAGE, true);
rend_buffer_write(renderer, &particle_buf, initial_particles, buffer_size, 0);
size_t grid_buffer_size = GRID_WIDTH * GRID_HEIGHT * sizeof(uint32_t);
uint32_t *initial_grid = calloc(GRID_WIDTH * GRID_HEIGHT, sizeof(uint32_t));
for (int y = 0; y < 100; y++) {
for (int x = 150; x < 362; x++) {
initial_grid[y * GRID_WIDTH + x] = 1; // 1 = sand
}
}
RendBuffer src_buf = rend_buffer_create(renderer, GRID_WIDTH * GRID_HEIGHT * sizeof(uint32_t), REND_BUFFER_STORAGE, false);
RendBuffer dst_buf = rend_buffer_create(renderer, GRID_WIDTH * GRID_HEIGHT * sizeof(uint32_t), REND_BUFFER_STORAGE, false);
rend_buffer_write(renderer, &src_buf, initial_grid, grid_buffer_size, 0);
rend_buffer_write(renderer, &dst_buf, initial_grid, grid_buffer_size, 0);
uint64_t particles_address = rend_buffer_address(&particle_buf);
RendBuffer *src_grid = &src_buf;
RendBuffer *dst_grid = &dst_buf;
RendPushConstantInfo pc = { .offset = 0, .size = sizeof(PushConstants) };
RendPipeline particle_compute = rend_pipeline_create_compute_spirv(renderer, particles_shader, particles_bytes, &pc, 1);
RendPipeline sand_compute = rend_pipeline_create_compute_spirv(renderer, sand_shader, sand_bytes, &pc, 1);
free(particles_shader);
free(sand_shader);
RendPipeline graphics_pipeline = rend_pipeline_create_graphics_bindless_spirv(renderer, vert, vert_size, frag, frag_size, &pc, 1, REND_POLYGON_MODE_FILL, REND_CULL_MODE_NONE, REND_TOPOLOGY_TRIANGLE_LIST, 0, true);
free(vert);
free(frag);
float dt = 1.0f / 60.0f;
uint64_t dt_ns = (uint64_t) (dt * NANOS_PER_SEC);
uint32_t mode = 2;
while (mode > 0) {
uint64_t start = peak_get_time();
PeakEvent ev;
while (peak_window_epoll(&win, &ev)) {
if (ev.type == PEAK_EVENT_WINDOW_CLOSE) {
mode -= 1;
break;
}
}
if (rend_renderer_frame_begin(renderer)) {
PushConstants pc = {0};
if (mode == 2) {
/*
* Sand Simulation
*/
pc.delta_time = dt;
pc.width = GRID_WIDTH;
pc.height = GRID_HEIGHT;
pc.render_mode = 1;
pc.src_grid = src_grid->gpu_address;
pc.dst_grid = dst_grid->gpu_address;
rend_pipeline_bind(sand_compute);
rend_pipeline_push_constants(sand_compute, &pc, sizeof(pc));
uint32_t x = (GRID_WIDTH + 15) / 16;
uint32_t y = (GRID_HEIGHT + 15) / 16;
rend_pipeline_dispatch(sand_compute, x, y, 1);
RendBuffer *temp = src_grid;
src_grid = dst_grid;
dst_grid = temp;
memset(src_grid->mapped_memory, 0, grid_buffer_size);
} else {
/*
* Particles Simulation
*/
pc.particles = particles_address;
pc.delta_time = dt;
pc.particle_count = PARTICLE_COUNT;
pc.render_mode = 0;
rend_pipeline_bind(particle_compute);
rend_pipeline_push_constants(particle_compute, &pc, sizeof(pc));
rend_pipeline_dispatch(particle_compute, (PARTICLE_COUNT + 255) / 256, 1, 1);
}
rend_renderer_render_pass_begin(renderer, 0.5f, 0.5f, 0.5f, 0.0f); {
rend_pipeline_bind(graphics_pipeline);
rend_pipeline_push_constants(graphics_pipeline, &pc, sizeof(pc));
uint32_t vertex_count = (mode == 2) ? (6 * GRID_WIDTH * GRID_HEIGHT) : (6 * PARTICLE_COUNT);
rend_pipeline_draw(graphics_pipeline, vertex_count, 1);
} rend_renderer_render_pass_end(renderer);
rend_renderer_frame_end(renderer, NULL);
}
uint64_t delta_ns = peak_get_time() - start;
if (delta_ns < dt_ns) {
peak_sleep_ns(dt_ns - delta_ns);
}
}
free(initial_particles);
free(initial_grid);
rend_buffer_destroy(&particle_buf);
rend_buffer_destroy(&src_buf);
rend_buffer_destroy(&dst_buf);
rend_renderer_destroy(renderer);
rend_quit();
peak_window_close(&win);
peak_quit();
#if DEBUG_MEMORY
peak_debug_memory_report();
#endif
return 0;
}
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