From 19b003a840f08ecc5016a3f9a4a085274fd55e27 Mon Sep 17 00:00:00 2001
From: cutealien <cutealien@dfc29bdd-3216-0410-991c-e03cc46cb475>
Date: Tue, 8 Feb 2022 21:00:12 +0000
Subject: [PATCH] IBillboardSceneNode got functions to access meshbuffers. So
 uv-coordinates can now be modified directly (previously only possible via
 texture matrix).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6299 dfc29bdd-3216-0410-991c-e03cc46cb475
---
 changes.txt                           |  1 +
 include/IBillboardSceneNode.h         | 12 ++++++++++++
 source/Irrlicht/CBillboardSceneNode.h | 14 ++++++++++++++
 source/Irrlicht/CTextSceneNode.h      | 12 ++++++++++++
 4 files changed, 39 insertions(+)

diff --git a/changes.txt b/changes.txt
index 47da246..b9b3b27 100644
--- a/changes.txt
+++ b/changes.txt
@@ -1,5 +1,6 @@
 --------------------------
 Changes in 1.9 (not yet released)
+- IBillboardSceneNode got functions to access meshbuffers. So uv-coordinates can now be modified directly (previously only possible via texture matrix).
 - vector3d scalar operator/ and operator/= no longer multiply by the inverse but use the expected division. 
   Costs some speed, but fixes floating point troubles caused by this optimization (like x/x no longer being 1.0).
 - Bugfix: XML reader dropped last character in strings if there was a special character replacement for the second-last character.
diff --git a/include/IBillboardSceneNode.h b/include/IBillboardSceneNode.h
index ee7a332..0d6fcc9 100644
--- a/include/IBillboardSceneNode.h
+++ b/include/IBillboardSceneNode.h
@@ -12,6 +12,7 @@ namespace irr
 namespace scene
 {
 	class ICameraSceneNode;
+	class IMeshBuffer;
 
 //! A billboard scene node.
 /** A billboard is like a 3d sprite: A 2d element,
@@ -74,6 +75,17 @@ public:
 	    That is why the usual getBoundingBox will return a "safe" boundingbox which is guaranteed
 	    to contain the billboard. While this function can return the real one. */
 	virtual const core::aabbox3d<f32>& getTransformedBillboardBoundingBox(const irr::scene::ICameraSceneNode* camera) = 0;
+
+	//! Get the amount of mesh buffers.
+	/** \return Amount of mesh buffers (IMeshBuffer) in this mesh. */
+	virtual u32 getMeshBufferCount() const = 0;
+
+	//! Get pointer to a mesh buffer.
+	/** NOTE: Positions and normals of this meshbuffers are re-calculated before rendering.
+	So this is mainly useful to access/modify the uv-coordinates.
+	\param nr: Zero based index of the mesh buffer.
+	\return Pointer to the mesh buffer or 0 if there is no such	mesh buffer. */
+	virtual IMeshBuffer* getMeshBuffer(u32 nr) const = 0;
 };
 
 } // end namespace scene
diff --git a/source/Irrlicht/CBillboardSceneNode.h b/source/Irrlicht/CBillboardSceneNode.h
index 2bb6cbe..0e3a74d 100644
--- a/source/Irrlicht/CBillboardSceneNode.h
+++ b/source/Irrlicht/CBillboardSceneNode.h
@@ -72,6 +72,20 @@ public:
 	//! Get the real boundingbox used by the billboard (which depends on the active camera)
 	virtual const core::aabbox3d<f32>& getTransformedBillboardBoundingBox(const irr::scene::ICameraSceneNode* camera) IRR_OVERRIDE;
 
+	//! Get the amount of mesh buffers.
+	virtual u32 getMeshBufferCount() const
+	{
+		return Buffer ? 1 : 0;
+	}
+
+	//! Get pointer to the mesh buffer.
+	virtual IMeshBuffer* getMeshBuffer(u32 nr) const
+	{
+		if ( nr == 0 )
+			return Buffer;
+		return 0;
+	}
+
 	//! Writes attributes of the scene node.
 	virtual void serializeAttributes(io::IAttributes* out, io::SAttributeReadWriteOptions* options=0) const IRR_OVERRIDE;
 
diff --git a/source/Irrlicht/CTextSceneNode.h b/source/Irrlicht/CTextSceneNode.h
index 2d2c71e..d8af787 100644
--- a/source/Irrlicht/CTextSceneNode.h
+++ b/source/Irrlicht/CTextSceneNode.h
@@ -145,6 +145,18 @@ namespace scene
 
 		virtual const core::aabbox3d<f32>& getTransformedBillboardBoundingBox(const irr::scene::ICameraSceneNode* camera) IRR_OVERRIDE;
 
+		//! Get the amount of mesh buffers.
+		virtual u32 getMeshBufferCount() const
+		{
+			return Mesh ? Mesh->getMeshBufferCount() : 0;
+		}
+
+		//! Get pointer to the mesh buffer.
+		virtual IMeshBuffer* getMeshBuffer(u32 nr) const
+		{
+			return Mesh ? Mesh->getMeshBuffer(nr) : 0;
+		}
+
 	protected:
 		void updateMesh(const irr::scene::ICameraSceneNode* camera);