demotool/test/shaders/fullscreen.v.glsl

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#version 450 core
//! type vertex
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out gl_PerVertex {
vec4 gl_Position;
};
void main( void )
{
gl_Position = vec4(
vec2( gl_VertexID >> 1 , gl_VertexID & 1 ) * 2 - 1 ,
0 , 1 );
}