source: downloads/Samples/Media/materials/programs/Blur1_vs.glsl @ 3

varying vec2 texCoord[5];

void main()                    
{
        vec2 inPos = sign(gl_Vertex.xy);
        gl_Position = vec4(inPos.xy, 0.0, 1.0);
        
        texCoord[0]  = (vec2(inPos.x, -inPos.y) + 1.0)/2.0;
        
        const float size = 0.01;
        texCoord[1] = texCoord[0] + vec2(0.0, 1.0)*size;
        texCoord[2] = texCoord[0] + vec2(0.0, 2.0)*size;
        texCoord[3] = texCoord[0] + vec2(0.0, -1.0)*size;
        texCoord[4] = texCoord[0] + vec2(0.0, -2.0)*size;
}