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// A triangle that fills the whole screen
vec2[3] TRIANGLE_POS = vec2[](
vec2( 0.0, -3.0),
vec2(-3.0, 1.0),
vec2( 3.0, 1.0)
);
void main() {
gl_Position = vec4(TRIANGLE_POS[gl_VertexID], 0.0, 1.0);
}