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#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#ifdef PLATFORM_WEB
#include RAYLIB_SRC
#else
#include <raylib.h>
#endif
typedef uint32_t u32;
#define MOONS_CAP 4
#define PLANETS_CAP 10
int SW = 1200;
int SH = 800;
#define OFF_Y (7*SH/9)
int sector_len = 16;
u32 seed = 0;
typedef struct {
int diameter;
u32 color;
bool ring;
int moons[MOONS_CAP];
} planet_t;
typedef struct {
int diameter;
u32 color;
} star_t;
star_t star_gen();
void planets_gen(planet_t *planets);
uint32_t lehmer();
int rnd_int(int max, int min);
#define HEX_TO_COL(col) {((col) >> 16) & 0xFF, \
((col) >> 8) & 0xFF, \
(col) & 0xFF, 0xFF}
int main(void)
{
InitWindow(SW, SH, "Procedural Generation");
SetTargetFPS(30);
SetWindowState(FLAG_WINDOW_RESIZABLE);
int offset_x = 0;
int offset_y = 0;
while (!WindowShouldClose())
{
SW = GetScreenWidth();
SH = GetScreenHeight();
int sectors_x = SW/sector_len;
int sectors_y = SH/sector_len;
sector_len += (int)GetMouseWheelMove();
if(sector_len <= 0) sector_len = 1;
if(IsKeyDown(KEY_W)) offset_y -= 1;
if(IsKeyDown(KEY_A)) offset_x -= 1;
if(IsKeyDown(KEY_S)) offset_y += 1;
if(IsKeyDown(KEY_D)) offset_x += 1;
static bool extra_info = false;
star_t info_star; planet_t info_planets[PLANETS_CAP];
if(IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) extra_info = false;
BeginDrawing();
ClearBackground(BLACK);
// gen each sector
for(int i = 0; i < sectors_x; i++)
for(int j = 0; j < sectors_y; j++) {
seed = ((i+offset_x) & 0xFFFF) << 16 | ((j+offset_y) & 0xFFFF);
if(rnd_int(25, 0) != 0) continue;
star_t star = star_gen();
int x = i * sector_len + (sector_len/2);
int y = j * sector_len + (sector_len/2);
float diam = (float)star.diameter*sector_len/96;
DrawCircle(x, y, diam, (Color)HEX_TO_COL(star.color));
// hover over star
if(GetMouseX()/sector_len == i && GetMouseY()/sector_len == j) {
DrawCircleLines(x, y, diam + 4, (Color)HEX_TO_COL(star.color));
// click on star
if(IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
extra_info = true;
info_star = star;
planets_gen(info_planets);
}
}
}
// extra info rec
if(extra_info) {
DrawRectangle(0, 2*SH/3, SW, SH/3, BLUE);
// draw star
int body_offset = 50 + info_star.diameter;
DrawCircle(body_offset, OFF_Y, info_star.diameter,
(Color)HEX_TO_COL(info_star.color));
body_offset += 90 + info_star.diameter;
// draw planets
for(int i = 0; i < PLANETS_CAP; i++) {
if(info_planets[i].diameter == 0) continue;
body_offset += info_planets[i].diameter;
DrawCircle(body_offset, OFF_Y, info_planets[i].diameter,
(Color)HEX_TO_COL(info_planets[i].color));
if(info_planets[i].ring) {
DrawCircleLines(body_offset, OFF_Y,
info_planets[i].diameter + 6,
(Color)HEX_TO_COL(info_planets[i].color));
DrawCircleLines(body_offset, OFF_Y,
info_planets[i].diameter + 7,
(Color)HEX_TO_COL(info_planets[i].color));
}
// draw moons
int y_off = info_planets[i].diameter + 10;
for(int j = 0; j < MOONS_CAP; j++) {
if(info_planets[i].moons[j] == 0) continue;
y_off += info_planets[i].moons[j];
DrawCircle(body_offset, OFF_Y + y_off,
info_planets[i].moons[j], GRAY);
y_off += 10 + info_planets[i].moons[j];
}
body_offset += 50 + info_planets[i].diameter;
}
}
DrawFPS(10, 10);
EndDrawing();
}
CloseWindow();
}
star_t star_gen()
{
star_t star;
star.diameter = rnd_int(80, 20);
star.color = rnd_int(0xFFFFFF, 0);
return star;
}
void planets_gen(planet_t *planets)
{
int n = rnd_int(PLANETS_CAP, 0);
for(int i = 0; i < PLANETS_CAP; i++) {
if(i >= n) {
planets[i].diameter = 0;
continue;
}
planets[i].diameter = rnd_int(40, 10);
planets[i].color = rnd_int(0xFFFFFF, 0);
planets[i].ring = (rnd_int(5, 0) == 1);
for(int j = 0; j < MOONS_CAP; j++)
planets[i].moons[j] = rnd_int(15, 0);
}
}
uint32_t lehmer()
{
seed += 0xe120fc15;
uint64_t tmp;
tmp = (uint64_t)seed * 0x4a39b70d;
uint32_t m1 = (tmp >> 32) ^ tmp;
tmp = (uint64_t)m1 * 0x12fad5c9;
uint32_t m2 = (tmp >> 32) ^ tmp;
return m2;
}
int rnd_int(int max, int min)
{
return (lehmer() % (max - min)) + min;
}
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