saved window position on startup.

tidy up moar.

exercises.

res/shaders/vertex.vert

@@ -0,0 +1,10 @@
+#version 420 core
+layout (location = 0) in vec3 aPos;
+//layout (location = 0) in vec2 aPos;
+//layout (location = 0) in float aPosx;
+//layout (location = 1) in float aPosy;
+//layout (location = 2) in float aPosz;
+
+void main() {
+    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+}