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attribute vec2 pos;
varying mediump vec2 texcoord;
varying mediump vec2 screencoord;
uniform mediump float width, height;
uniform mediump vec2 texsize;
void main()
{
gl_Position = vec4(pos, 0.0, 1.0);
texcoord = sign(pos) * vec2(0.5*width/texsize.x, -0.5*height/texsize.y) + vec2(0.5*width/texsize.x, 0.5*height/texsize.y);
screencoord = sign(pos);
}
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