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#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <SDL2/SDL.h>
#define UPSCALE_FACTOR 3
#define WIN_HEIGHT 240
#define WIN_WIDTH 320
#define FPS 60
static void pixel(SDL_Renderer* r, unsigned px, unsigned py, unsigned cr, unsigned cg, unsigned cb) {
SDL_SetRenderDrawColor(r, cr, cg, cb, 255);
SDL_RenderFillRect(r, &(SDL_Rect) {.x = px * UPSCALE_FACTOR, .y = py * UPSCALE_FACTOR, .w = UPSCALE_FACTOR, .h = UPSCALE_FACTOR});
}
int main() {
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS);
SDL_Window *window = SDL_CreateWindow("sdl2 test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIN_WIDTH * UPSCALE_FACTOR, WIN_HEIGHT * UPSCALE_FACTOR, SDL_WINDOW_SHOWN);
SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_Event e;
unsigned long frame = 0;
while (true) {
uint32_t start = SDL_GetTicks();
frame++;
while (SDL_PollEvent(&e)) if (e.type == SDL_QUIT) exit(0);
SDL_RenderClear(renderer);
for (unsigned i = 0; i < WIN_WIDTH; i++) {
for (unsigned j = 0; j < WIN_HEIGHT; j++) {
pixel(renderer, i, j, (unsigned)(sqrt(i * 20) + frame) % 255, (i * j + frame) % 255, (j * 20) % 255);
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderPresent(renderer);
uint32_t end = SDL_GetTicks();
int wait_for = 1000 / FPS - (end - start);
if (wait_for > 0) SDL_Delay(wait_for);
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
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