Rotating verticies created by a geometry shader - c++

Question

I am trying to generate a cube from 6 points (each point representing a side, then 2 extra values to say if its rotated to face on the x, or y axis, z axis doesn't need one because its like that by default). Problem comes in when I try to multiply the gl_Position value by a mat4 rotation matrix to make the sides of the cube rotated properly. It doesn't even glitch out, it just doesn't display the faces at all (it does when I dont have the matrices multiplying the values).
Heres my geometry shader:
layout(points) in;
layout(triangle_strip, max_vertices = 4) out;
in vec3 gFacePos[];
out vec2 texCoord;
mat4 xtrans = mat4( //rotate on the x axis
1.0, 0.0, 0.0, 0.0,
0.0, 0.0, -1.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0
);
mat4 ytrans = mat4( //rotate on y
0.0, 0.0, 1.0, 0.0,
0.0, 1.0, 0.0, 0.0,
-1.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0
);
mat4 rtrans = (gFacePos[0].x * xtrans) + (gFacePos[0].y * ytrans); //figure out what the current point wants to rotate on
void main() { //this whole thing makes a square at the requested point
gl_Position = gl_in[0].gl_Position + vec4(-0.5, 0.5, 0.0, 0.0);
gl_Position *= rtrans; //these break it
texCoord = vec2(0.0, 0.0);
EmitVertex();
gl_Position = gl_in[0].gl_Position + vec4(0.5, 0.5, 0.0, 0.0);
gl_Position *= rtrans;
texCoord = vec2(1.0, 0.0);
EmitVertex();
gl_Position = gl_in[0].gl_Position + vec4(-0.5, -0.5, 0.0, 0.0);
gl_Position *= rtrans;
texCoord = vec2(0.0, 1.0);
EmitVertex();
gl_Position = gl_in[0].gl_Position + vec4(0.5, -0.5, 0.0, 0.0);
gl_Position *= rtrans;
texCoord = vec2(1.0, 1.0);
EmitVertex();
EndPrimitive();
}
Fragment and vertex are pretty standard (vertex has some basic camera stuff on it).