Inner Mysteries of "WinQuakey" Clients

[MH]

They didn't call it "the last great software renderer" for nothing, you know.

To be honest, there is so much stuff badly broken in GLQuake that it really needs a top to bottom rewrite.

Incidentially, most of the "washed out" GLQuake look comes from the way it generates mipmaps. Traditional box filter approaches do end up throwing away a lot of the colour info. You can get much better results by using the following...

// top of gl_draw.c
int ls_up_table[256];
byte ls_dn_table[200000];

// in Draw_Init
for (i = 0; i < 256; i++)
	ls_up_table[i] = pow (i, 2.2);

for (i = 0; i < 200000; i++)
{
	float f = pow (i, 0.454545) + 0.5f;;

	ls_dn_table[i] = (byte) (f > 255 ? 255 : f);
}

// replacement for GL_Mipmap
void GL_MipMap (byte *in, int width, int height)
{
	int i, j;
	byte *out;

	width <<= 2;
	height >>= 1;
	out = in;

	for (i = 0; i < height; i++, in += width)
	{
		for (j = 0; j < width; j += 8, out += 4, in += 8)
		{
			byte *in2 = &in[width];

			out[0] = ls_dn_table[((ls_up_table[in[0]] + ls_up_table[in[4]] + ls_up_table[in2[0]] + ls_up_table[in2[4]]) >> 2)];
			out[1] = ls_dn_table[((ls_up_table[in[1]] + ls_up_table[in[5]] + ls_up_table[in2[1]] + ls_up_table[in2[5]]) >> 2)];
			out[2] = ls_dn_table[((ls_up_table[in[2]] + ls_up_table[in[6]] + ls_up_table[in2[2]] + ls_up_table[in2[6]]) >> 2)];

			// leave alpha as is
			out[3] = (in[3] + in[7] + in2[3] + in2[7]) >> 2;
		}
	}
}