"\n"
"void main()\n"
"{\n"
-" float fbarx = (a_co.x+uOffset.x) * uOffset.z;\n"
-" float fbary = a_co.y*uOffset.w + uOffset.y;\n"
-"\n"
-" vec2 vpos = vec2( fbarx, fbary );\n"
+" vec2 vpos = a_co * uOffset.zw + uOffset.xy;\n"
" gl_Position = vec4(vpos,0.0,1.0);\n"
"}\n"
""},