GPT is reall good at generating comments and fixing spelling error

shaders/physics_update.vert

@@ -0,0 +1,11 @@
+#version 300 es
+precision highp float;
+
+in vec2 position;  // Fullscreen quad vertices
+out vec2 vTexCoord;
+
+void main() {
+    vTexCoord = position * 0.5 + 0.5;  // [-1,1] -> [0,1]
+    gl_Position = vec4(position, 0.0, 1.0);
+}
+