#include <glerminal.h>

#include <cstdlib>
#include <cmath>

namespace
{
	void init()
	{
		glerminal_load_sprites_file("resources/towers.png");

		for (int i = 0; i < 256; i++)
		{
			constexpr unsigned char c = 0;
			const unsigned char v = (255 - c) * powf((i - 1) / 256.0f, 2.0f) + c;
			const unsigned int j = (0x7F << 24) | (v << 16) | (v << 8) | v;
			glerminal_layer_color(i, j);
			glerminal_layer_scale(i, i / 256.0f + 1);
		}

		for (int i = 0; i < 40; i++)
		{
			for (int j = 0; j < 25; j++)
			{
				const int c = rand() % 224 + 32;
				for (int k = 0; k < c; k++)
				{
					glerminal_set(i, j, k, 1);
				}
			}
		}
	}

	void mainloop(float dt)
	{
		static float time = 0;

		time += dt;

		const float cx = 20.0f * cosf(time / 3.1415f) + 20.0f;
		const float cy = 12.5f * sinf(time / 3.1415f) + 12.5f;

		for (int i = 0; i < 40; i++)
		{
			for (int j = 0; j < 25; j++)
			{
				for (int k = 0; k < 256; k++)
				{
					const float ox = 0.01f * k * (i - cx);
					const float oy = 0.01f * k * (j - cy);
					glerminal_offset(i, j, k, ox + (1 + 0.004f * k) * cosf(i + k * 6.2832f / 128.0f + 3.1415f * time), oy + (1 + 0.004f * k) * sinf(j + k * 6.2832f / 128.0f + 3.1415f * time));
				}
			}
		}

		glerminal_flush();
	}
}

int main(int argc, char** argv)
{
	glerminal_run(init, mainloop);
}