Add everything.

Resources/Shaders/skybox_vert.glsl

@@ -0,0 +1,14 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+
+out vec3 fragPos;
+
+uniform mat4 projection;
+uniform mat4 view;
+
+void main()
+{
+    fragPos = aPos;
+    vec4 pos = projection * view * vec4(aPos, 1.0);
+    gl_Position = pos.xyww; // Trick to ensure skybox depth is always 1.0 (furthest)
+}