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_SetRenderDrawBlendMode(r, SDL_BLENDMODE_BLEND);
	SDL_SetRenderDrawColor(r, 10, 10, 10, 20);
	SDL_Rect screen = { 0, 0, 512, 512 };
	SDL_RenderFillRect(r, &screen);
	// SDL_RenderClear(r);

	// TODO: DRAW WITH X SCALE FACTOR
	// TODO: DRAW SMOLER
	SDL_SetRenderDrawColor(r, 0xFF, 0x00, 0x4D, 255);
	const space = (44100 * 8) / 512;
	const int t = 0; // TODO: DRAW L / R OVERLAPPED IN DIFF COLORS ?
	const int wav_h = 128;
	if 0 do
	foreach_ptr(Sound_src, snd, state -> sounds)
		if snd -> state != SND_FREE do {
			const int y = wav_h / 2 + (wav_h + 4) * snd_i;
			const int top = y - 64, bot = y + 64;
			for int x = 0; x < 512 and x * space < snd->track_len; x += 1 do {
				const int val = snd -> tracks[t][x * space];
				const int sign = val < 0 ? -1 : 1;
				SDL_RenderDrawLine(r, x, y + sign, x, y + val / 2);
				//SDL_RenderDrawPoint(r, x, y + val / 2);
			}

			const int x = snd -> pos / space;
			if state -> played_audio_last_frame do
				SDL_RenderDrawLine(r, x, top, x, bot);
			SDL_RenderDrawLine(r, snd->start / space, top, snd->start / space, bot);
			SDL_RenderDrawLine(r, snd->end / space, top, snd->end / space, bot);
		}

	static u8 markov[256][256];
	SDL_memset(markov, 0, sizeof markov);
	for int x = 0; x < FRAME_SAMPLES - 1; x += 1 do {
		u8 cur = state->frame_mix[0][x] + 128;
		u8 next = state->frame_mix[0][x + 1] + 128;
		markov[cur][255 - next] += 1;
	}
	for int x = 0; x < 256; x += 1 do {
		u8 to = 0;
		for int y = 0; y < 255; y += 1 do to += markov[x][y];
		markov[x][255] = to;
	}
	for int x = 0; x < 256; x += 1 do {
		u8 to = markov[x][255];
		if to == 0 do continue;
		for int y = 0; y < 255; y += 1 do
			; //markov[x][y] *= to;
	}

	for int x = 0; x < 256; x += 1 do	
		for int y = 0; y < 256; y += 1 do {
			u8 m = markov[x][y];
			const int s = 20;
			SDL_SetRenderDrawColor(r, m * s, m * s, m * s, 255);
			if m != 0 do {
				SDL_RenderDrawPoint(r, x * 2, y * 2);
				SDL_RenderDrawPoint(r, x * 2 + 1, y * 2);
				SDL_RenderDrawPoint(r, x * 2, y * 2 + 1);
				SDL_RenderDrawPoint(r, x * 2 + 1, y * 2 + 1);
			}
		}

	SDL_RenderPresent(r);
}