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caveexpress 2.5.2-4
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// attributes from the VAOs
in vec2 a_pos;
in vec2 a_texcoord;
in vec4 a_color;

uniform mat4 u_projection;

out vec2 v_texcoord;
out vec4 v_color;

void main(void) {
	v_color = a_color;
	v_texcoord = a_texcoord;
	gl_Position = u_projection * vec4(a_pos.x, a_pos.y, 0.0, 1.0);
}