ampler/draw.c

// draw.c

void draw_frame(SDL_Window *w, SDL_Renderer *r, Ampler_state *state) {
	SDL_SetRenderDrawColor(r, 0x1D, 0x2B, 0x53, 255);
	SDL_RenderClear(r);

	SDL_SetRenderDrawColor(r, 0xFF, 0x00, 0x4D, 255);
	const space = (44100 * 8) / 512;
	for int t = 0; t < arraylen(state -> tracks); t += 1 do
		for int x = 0; x < 512; x += 1 do {
			const int y = 128 + 256 * t;
			const int val = state -> tracks[t][x * space];
			SDL_RenderDrawLine(r, y + val / 8, x, y + val, x);
			//SDL_RenderDrawPoint(r, y + val, x);
		}

	if state -> played_audio_last_frame do
	for int i = 0; i < arraylen(state -> sounds); i += 1 do {
		const int x = (state -> sounds[i].start + state -> sounds[i].pos) / space;
		SDL_RenderDrawLine(r, 0, x, 512, x);
	}

	SDL_RenderPresent(r);
}