Add `up` argument to `DrawBillboardPro` (#1941)

* Add `up` argument to `DrawBillboardPro`

* Replace tab with proper spaces

src/models.c

@@ -3098,10 +3098,13 @@ void DrawBillboard(Camera camera, Texture2D texture, Vector3 position, float siz
 // Draw a billboard (part of a texture defined by a rectangle)
 void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector2 size, Color tint)
 {
-    DrawBillboardPro(camera, texture, source, position, size, Vector2Zero(), 0.0f, tint);
+    // NOTE: Billboard locked on axis-Y
+    Vector3 up = { 0.0f, 1.0f, 0.0f };
+	
+    DrawBillboardPro(camera, texture, source, position, up, size, Vector2Zero(), 0.0f, tint);
 }
 
-void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector2 size, Vector2 origin, float rotation, Color tint)
+void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint)
 {
     // NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width
     Vector2 sizeRatio = { size.y, size.x*(float)source.height/source.width };
@@ -3111,9 +3114,6 @@ void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector
     Vector3 right = { matView.m0, matView.m4, matView.m8 };
     //Vector3 up = { matView.m1, matView.m5, matView.m9 };
 
-    // NOTE: Billboard locked on axis-Y
-    Vector3 up = { 0.0f, 1.0f, 0.0f };
-
     Vector3 rightScaled = Vector3Scale(right, sizeRatio.x/2);
     Vector3 upScaled = Vector3Scale(up, sizeRatio.y/2);
 

src/raylib.h

@@ -1403,7 +1403,7 @@ RLAPI void DrawModelWiresEx(Model model, Vector3 position, Vector3 rotationAxis,
 RLAPI void DrawBoundingBox(BoundingBox box, Color color);                                               // Draw bounding box (wires)
 RLAPI void DrawBillboard(Camera camera, Texture2D texture, Vector3 position, float size, Color tint);   // Draw a billboard texture
 RLAPI void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector2 size, Color tint); // Draw a billboard texture defined by source
-RLAPI void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector2 size, Vector2 origin, float rotation, Color tint); // Draw a billboard texture defined by source and rotation
+RLAPI void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint); // Draw a billboard texture defined by source and rotation
 
 // Mesh management functions
 RLAPI void UploadMesh(Mesh *mesh, bool dynamic);                                            // Upload mesh vertex data in GPU and provide VAO/VBO ids