File: shader.vert

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#version 450

vec2 positions[6] = vec2[](
    vec2(-1.0, -1.0),
    vec2(1.0, -1.0),
    vec2(1.0, 1.0),
    vec2(-1.0, -1.0),
    vec2(1.0, 1.0),
    vec2(-1.0, 1.0)
);

vec2 coord[6] = vec2[](
    vec2(0.0, 0.0),
    vec2(1.0, 0.0),
    vec2(1.0, 1.0),
    vec2(0.0, 0.0),
    vec2(1.0, 1.0),
    vec2(0.0, 1.0)
);

layout(location = 0) out vec2 texCoord;

void main() {
    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
    texCoord = coord[gl_VertexIndex];
}