void CGLRenderer::PrepareSphere(float radius)
{
	float x, y, z;
	int k = 0;
	int i = 0;
	const float PI = 3.145926;
	const int sectors = 20;

	int r = 0;
	for (int i = 0; i < sectors + 1; i++)
	{
		for (int j = 0; j < sectors + 1; j++) {
			int nextStrip = j + (i + 1) * sectors;
			int currStrip = j + i * sectors;

			indicesSphere[r++] = currStrip;
			indicesSphere[r++] = nextStrip;
			indicesSphere[r++] = nextStrip + 1;

			indicesSphere[r++] = currStrip + 1;
			indicesSphere[r++] = currStrip;
			indicesSphere[r++] = nextStrip + 1;

		}
	}
	sphereVert = r;
	texSphere = new float[sectors * sectors * 2];

	int texCoords = 0;
	for (float lat = -PI / 2; lat <= PI / 2; lat += (PI / sectors)) {
		for (float lon = -PI; lon <= PI; lon += (2 * PI) / sectors) {

			x = radius * cos(lat) * cos(lon);
			y = radius * cos(lat) * sin(lon);
			z = radius * sin(lat);

			normalsSphere[i++] = x / radius;
			normalsSphere[i++] = y / radius;
			normalsSphere[i++] = z / radius;

			vertSphere[k++] = x;
			vertSphere[k++] = y;
			vertSphere[k++] = z;

			//Y = (X - A) / (B - A) * (D - C) + C

			texSphere[texCoords++] = (lat - (-PI / 2)) / PI;
			texSphere[texCoords++] = (lat - (-PI)) / (2*PI);
		}
	}

	//lat => x;
	//lon => y
}