Add GenMeshPlaneData() for CPU-side mesh generation without GPU upload

src/raylib.h

@@ -1617,7 +1617,8 @@ RLAPI bool ExportMeshAsCode(Mesh mesh, const char *fileName);
 
 // Mesh generation functions
 RLAPI Mesh GenMeshPoly(int sides, float radius);                                            // Generate polygonal mesh
-RLAPI Mesh GenMeshPlane(float width, float length, int resX, int resZ);                     // Generate plane mesh (with subdivisions)
+RLAPI Mesh GenMeshPlane(float width, float length, int resX, int resZ);                     // Generate plane mesh (with subdivisions) and upload to GPU
+RLAPI Mesh GenMeshPlaneData(float width, float length, int resX, int resZ);                 // Generate plane mesh data (with subdivisions)
 RLAPI Mesh GenMeshCube(float width, float height, float length);                            // Generate cuboid mesh
 RLAPI Mesh GenMeshSphere(float radius, int rings, int slices);                              // Generate sphere mesh (standard sphere)
 RLAPI Mesh GenMeshHemiSphere(float radius, int rings, int slices);                          // Generate half-sphere mesh (no bottom cap)

src/rmodels.c

@@ -2634,8 +2634,20 @@ Mesh GenMeshPoly(int sides, float radius)
     return mesh;
 }
 
-// Generate plane mesh (with subdivisions)
+// Generate plane mesh (with subdivisions) and upload to GPU
 Mesh GenMeshPlane(float width, float length, int resX, int resZ)
+{
+    Mesh mesh = GenMeshPlaneData(width, length, resX, resZ);
+
+    // Upload vertex data to GPU (static mesh)
+    UploadMesh(&mesh, false);
+
+    return mesh;
+}
+
+// Generate plane mesh data (with subdivisions), no GPU upload
+// Allows CPU-side mesh manipulation (e.g. vertex deformation) before manually calling UploadMesh()
+Mesh GenMeshPlaneData(float width, float length, int resX, int resZ)
 {
     Mesh mesh = { 0 };
 
@@ -2761,9 +2773,6 @@ Mesh GenMeshPlane(float width, float length, int resX, int resZ)
     par_shapes_free_mesh(plane);
 #endif
 
-    // Upload vertex data to GPU (static mesh)
-    UploadMesh(&mesh, false);
-
     return mesh;
 }