// by guest(r) - guest.r@gmail.com
// license: GNU-GPL

uniform vec4 OGL2Param;
uniform vec4 OGL2Size;

void main()
{
float x = (OGL2Size.x/2048.0)*OGL2Param.x;
float y = (OGL2Size.y/1024.0)*OGL2Param.y;
vec2 dg1 = vec2( x,y);
vec2 dg2 = vec2(-x,y);
vec2 sd1 = dg1*0.5;
vec2 sd2 = dg2*0.5;
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_TexCoord[1].xy = gl_TexCoord[0].xy - sd1;
gl_TexCoord[2].xy = gl_TexCoord[0].xy - sd2;
gl_TexCoord[3].xy = gl_TexCoord[0].xy + sd1;
gl_TexCoord[4].xy = gl_TexCoord[0].xy + sd2;
gl_TexCoord[5].xy = gl_TexCoord[0].xy - dg1;
gl_TexCoord[6].xy = gl_TexCoord[0].xy + dg1;
gl_TexCoord[5].zw = gl_TexCoord[0].xy - dg2;
gl_TexCoord[6].zw = gl_TexCoord[0].xy + dg2;
}