source: data/data_extern/programs/GLSL150/Blur0_vs.glsl

#version 150

in vec4 vertex;
// in vec2 uv0;
out vec2 texCoord[5];

// uniform mat4 worldViewProj;

void main()
{
    // gl_Position = worldViewProj * vertex;

    // texCoord[0]  = uv0;

    vec2 inPos = sign(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(1.0, 0.0) * size;
    texCoord[2] = texCoord[0] + vec2(2.0, 0.0) * size;
    texCoord[3] = texCoord[0] + vec2(-1.0, 0.0) * size;
    texCoord[4] = texCoord[0] + vec2(-2.0, 0.0) * size;
}