update

shader/skybox.fragment.glsl

@@ -0,0 +1,12 @@
+#version 330
+
+in vec3 TexCoord0;
+
+out vec4 FragColor;
+
+uniform samplerCube gCubemapTexture;
+
+void main()
+{
+    FragColor = texture(gCubemapTexture, TexCoord0);
+}

shader/skybox.vertex.glsl

@@ -0,0 +1,14 @@
+#version 330
+
+in vec3 Position;
+
+uniform mat4 gWVP;
+
+out vec3 TexCoord0;
+
+void main()
+{
+    vec4 WVP_Pos = gWVP * vec4(Position, 1.0);
+    gl_Position = WVP_Pos.xyww;
+    TexCoord0 = Position;
+}