bytemedia

SDL_YUV_visualisation.c (1566B)

// Copyright © 2020 Haelwenn (lanodan) Monnier <https://hacktivis.me/>
// SPDX-License-Identifier: BSD-3-Clause
// Inspired by IBNIZ: http://pelulamu.net/ibniz/
#include <SDL2/SDL.h>
#define WIDTH 512
uint32_t pixels[WIDTH][WIDTH];
struct
{
	SDL_Window *s;
	SDL_Texture *o;
	SDL_Renderer *r;
} sdl;
int
main(void)
{
	SDL_Init(SDL_INIT_VIDEO);
	sdl.s = SDL_CreateWindow("SDL YUV", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, WIDTH, SDL_WINDOW_RESIZABLE);
	sdl.r = SDL_CreateRenderer(sdl.s, -1, 0);
	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "nearest");
	SDL_RenderSetLogicalSize(sdl.r, WIDTH, WIDTH);
	uint32_t format = SDL_PIXELFORMAT_YUY2;
	sdl.o = SDL_CreateTexture(sdl.r, format, SDL_TEXTUREACCESS_STREAMING, WIDTH, WIDTH);
	while(1) {
		SDL_Event event;
		while (SDL_PollEvent(&event)) {
			if(event.type == SDL_QUIT) goto quit;
			if((event.type == SDL_KEYDOWN)
			&& (event.key.keysym.sym==SDLK_ESCAPE)
			) goto quit;
		}
		uint32_t t = SDL_GetTicks();
		for(uint32_t y = 0; y < WIDTH; y++)
		for(uint32_t x = 0; x < WIDTH; x++)
		{
			//pixels[x][y] = (t|2)<<(x*y/2); // Mostly green with some colors; Christmas
			//pixels[x][y] = (x|t)*(y|t);
			//pixels[x][y] = 0x00FF0055;
			//pixels[x][y] = ((x/2)<<24&0xFF000000);
			pixels[x][y] = ((x/2)<<8&0x0000FF00);
		}
		SDL_UpdateTexture(sdl.o, NULL, &pixels, WIDTH*SDL_BYTESPERPIXEL(format));
		SDL_RenderClear(sdl.r);
		SDL_RenderCopy(sdl.r, sdl.o, NULL, NULL);
		SDL_RenderPresent(sdl.r);
	}
quit:
	SDL_DestroyRenderer(sdl.r);
	SDL_DestroyWindow(sdl.s);
	SDL_Quit();
	return 0;
}