Fixes needed to use irrArray backed by std::vector (#12263)

src/client/clientmap.cpp

@@ -449,15 +449,7 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 	drawcall_count += draw_order.size();
 
 	for (auto &descriptor : draw_order) {
-		scene::IMeshBuffer *buf;
+		scene::IMeshBuffer *buf = descriptor.getBuffer();
-		
-		if (descriptor.m_use_partial_buffer) {
-			descriptor.m_partial_buffer->beforeDraw();
-			buf = descriptor.m_partial_buffer->getBuffer();
-		}
-		else {
-			buf = descriptor.m_buffer;
-		}
 
 		// Check and abort if the machine is swapping a lot
 		if (draw.getTimerTime() > 2000) {
@@ -501,7 +493,7 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 		m.setTranslation(block_wpos - offset);
 
 		driver->setTransform(video::ETS_WORLD, m);
-		driver->drawMeshBuffer(buf);
+		descriptor.draw(driver);
 		vertex_count += buf->getIndexCount();
 	}
 
@@ -812,15 +804,7 @@ void ClientMap::renderMapShadows(video::IVideoDriver *driver,
 	drawcall_count += draw_order.size();
 
 	for (auto &descriptor : draw_order) {
-		scene::IMeshBuffer *buf;
+		scene::IMeshBuffer *buf = descriptor.getBuffer();
-		
-		if (descriptor.m_use_partial_buffer) {
-			descriptor.m_partial_buffer->beforeDraw();
-			buf = descriptor.m_partial_buffer->getBuffer();
-		}
-		else {
-			buf = descriptor.m_buffer;
-		}
 
 		// Check and abort if the machine is swapping a lot
 		if (draw.getTimerTime() > 1000) {
@@ -845,7 +829,7 @@ void ClientMap::renderMapShadows(video::IVideoDriver *driver,
 		m.setTranslation(block_wpos - offset);
 
 		driver->setTransform(video::ETS_WORLD, m);
-		driver->drawMeshBuffer(buf);
+		descriptor.draw(driver);
 		vertex_count += buf->getIndexCount();
 	}
 
@@ -966,3 +950,18 @@ void ClientMap::updateTransparentMeshBuffers()
 	m_needs_update_transparent_meshes = false;
 }
 
+scene::IMeshBuffer* ClientMap::DrawDescriptor::getBuffer()
+{
+	return m_use_partial_buffer ? m_partial_buffer->getBuffer() : m_buffer;
+}
+
+void ClientMap::DrawDescriptor::draw(video::IVideoDriver* driver)
+{
+	if (m_use_partial_buffer) {
+		m_partial_buffer->beforeDraw();
+		driver->drawMeshBuffer(m_partial_buffer->getBuffer());
+		m_partial_buffer->afterDraw();
+	} else {
+		driver->drawMeshBuffer(m_buffer);
+	}
+}

src/client/clientmap.h

@@ -174,6 +174,9 @@ private:
 		DrawDescriptor(v3s16 pos, const PartialMeshBuffer *buffer) :
 			m_pos(pos), m_partial_buffer(buffer), m_reuse_material(false), m_use_partial_buffer(true)
 		{}
+
+		scene::IMeshBuffer* getBuffer();
+		void draw(video::IVideoDriver* driver);
 	};
 
 	Client *m_client;

src/client/mapblock_mesh.cpp

@@ -1162,15 +1162,16 @@ void MapBlockBspTree::traverse(s32 node, v3f viewpoint, std::vector<s32> &output
 void PartialMeshBuffer::beforeDraw() const
 {
 	// Patch the indexes in the mesh buffer before draw
-
+	m_buffer->Indices = std::move(m_vertex_indexes);
-	m_buffer->Indices.clear();
-	if (!m_vertex_indexes.empty()) {
-		for (auto index : m_vertex_indexes)
-			m_buffer->Indices.push_back(index);
-	}
 	m_buffer->setDirty(scene::EBT_INDEX);
 }
 
+void PartialMeshBuffer::afterDraw() const
+{
+	// Take the data back
+	m_vertex_indexes = std::move(m_buffer->Indices.steal());
+}
+
 /*
 	MapBlockMesh
 */
@@ -1514,7 +1515,7 @@ void MapBlockMesh::updateTransparentBuffers(v3f camera_pos, v3s16 block_pos)
 		const auto &t = m_transparent_triangles[i];
 		if (current_buffer != t.buffer) {
 			if (current_buffer) {
-				m_transparent_buffers.emplace_back(current_buffer, current_strain);
+				m_transparent_buffers.emplace_back(current_buffer, std::move(current_strain));
 				current_strain.clear();
 			}
 			current_buffer = t.buffer;
@@ -1525,7 +1526,7 @@ void MapBlockMesh::updateTransparentBuffers(v3f camera_pos, v3s16 block_pos)
 	}
 
 	if (!current_strain.empty())
-		m_transparent_buffers.emplace_back(current_buffer, current_strain);
+		m_transparent_buffers.emplace_back(current_buffer, std::move(current_strain));
 }
 
 void MapBlockMesh::consolidateTransparentBuffers()
@@ -1539,7 +1540,7 @@ void MapBlockMesh::consolidateTransparentBuffers()
 	for (const auto &t : m_transparent_triangles) {
 		if (current_buffer != t.buffer) {
 			if (current_buffer != nullptr) {
-				this->m_transparent_buffers.emplace_back(current_buffer, current_strain);
+				this->m_transparent_buffers.emplace_back(current_buffer, std::move(current_strain));
 				current_strain.clear();
 			}
 			current_buffer = t.buffer;
@@ -1550,7 +1551,7 @@ void MapBlockMesh::consolidateTransparentBuffers()
 	}
 
 	if (!current_strain.empty()) {
-		this->m_transparent_buffers.emplace_back(current_buffer, current_strain);
+		this->m_transparent_buffers.emplace_back(current_buffer, std::move(current_strain));
 	}
 }
 

src/client/mapblock_mesh.h

@@ -140,20 +140,31 @@ private:
 	s32 root = -1; // index of the root node
 };
 
+/*
+ * PartialMeshBuffer
+ *
+ * Attach alternate `Indices` to an existing mesh buffer, to make it possible to use different
+ * indices with the same vertex buffer.
+ *
+ * Irrlicht does not currently support this: `CMeshBuffer` ties together a single vertex buffer
+ * and a single index buffer. There's no way to share these between mesh buffers.
+ *
+ */
 class PartialMeshBuffer
 {
 public:
-	PartialMeshBuffer(scene::SMeshBuffer *buffer, const std::vector<u16> &vertex_indexes) :
+	PartialMeshBuffer(scene::SMeshBuffer *buffer, std::vector<u16> &&vertex_indexes) :
-			m_buffer(buffer), m_vertex_indexes(vertex_indexes)
+			m_buffer(buffer), m_vertex_indexes(std::move(vertex_indexes))
 	{}
 
 	scene::IMeshBuffer *getBuffer() const { return m_buffer; }
 	const std::vector<u16> &getVertexIndexes() const { return m_vertex_indexes; }
 
 	void beforeDraw() const;
+	void afterDraw() const;
 private:
 	scene::SMeshBuffer *m_buffer;
-	std::vector<u16> m_vertex_indexes;
+	mutable std::vector<u16> m_vertex_indexes;
 };
 
 /*

src/irrlicht_changes/CGUITTFont.cpp

@@ -292,9 +292,6 @@ shadow_offset(0), shadow_alpha(0), fallback(0)
 		Driver->grab();
 
 	setInvisibleCharacters(L" ");
-
-	// Glyphs aren't reference counted, so don't try to delete them when we free the array.
-	Glyphs.set_free_when_destroyed(false);
 }
 
 bool CGUITTFont::load(const io::path& filename, const u32 size, const bool antialias, const bool transparency)
@@ -411,8 +408,7 @@ CGUITTFont::~CGUITTFont()
 {
 	// Delete the glyphs and glyph pages.
 	reset_images();
-	CGUITTAssistDelete::Delete(Glyphs);
+	Glyphs.clear();
-	//Glyphs.clear();
 
 	// We aren't using this face anymore.
 	auto n = c_faces.find(filename);
@@ -675,6 +671,8 @@ void CGUITTFont::draw(const EnrichedString &text, const core::rect<s32>& positio
 	update_glyph_pages();
 	auto it = Render_Map.begin();
 	auto ie = Render_Map.end();
+	core::array<core::vector2di> tmp_positions;
+	core::array<core::recti> tmp_source_rects;
 	while (it != ie)
 	{
 		CGUITTGlyphPage* page = it->second;
@@ -696,10 +694,8 @@ void CGUITTFont::draw(const EnrichedString &text, const core::rect<s32>& positio
 			do
 				++i;
 			while (i < page->render_positions.size() && page->render_colors[i] == colprev);
-			core::array<core::vector2di> tmp_positions;
+			tmp_positions.set_data(&page->render_positions[ibegin], i - ibegin);
-			core::array<core::recti> tmp_source_rects;
+			tmp_source_rects.set_data(&page->render_source_rects[ibegin], i - ibegin);
-			tmp_positions.set_pointer(&page->render_positions[ibegin], i - ibegin, false, false); // no copy
-			tmp_source_rects.set_pointer(&page->render_source_rects[ibegin], i - ibegin, false, false);
 			--i;
 
 			if (!use_transparency)

src/irrlicht_changes/CGUITTFont.h

@@ -37,6 +37,7 @@
 #include <map>
 #include <irrUString.h>
 #include "util/enriched_string.h"
+#include "util/basic_macros.h"
 #include FT_FREETYPE_H
 
 namespace irr
@@ -46,23 +47,34 @@ namespace gui
 	struct SGUITTFace;
 	class CGUITTFont;
 
-	//! Class to assist in deleting glyphs.
-	class CGUITTAssistDelete
-	{
-		public:
-			template <class T, typename TAlloc>
-			static void Delete(core::array<T, TAlloc>& a)
-			{
-				TAlloc allocator;
-				allocator.deallocate(a.pointer());
-			}
-	};
-
 	//! Structure representing a single TrueType glyph.
 	struct SGUITTGlyph
 	{
 		//! Constructor.
-		SGUITTGlyph() : isLoaded(false), glyph_page(0), surface(0), parent(0) {}
+		SGUITTGlyph() :
+			isLoaded(false),
+			glyph_page(0),
+			source_rect(),
+			offset(),
+			advance(),
+			surface(0),
+			parent(0)
+		{}
+
+		DISABLE_CLASS_COPY(SGUITTGlyph);
+
+		//! This class would be trivially copyable except for the reference count on `surface`.
+		SGUITTGlyph(SGUITTGlyph &&other) :
+			isLoaded(other.isLoaded),
+			glyph_page(other.glyph_page),
+			source_rect(other.source_rect),
+			offset(other.offset),
+			advance(other.advance),
+			surface(other.surface),
+			parent(other.parent)
+		{
+			other.surface = 0;
+		}
 
 		//! Destructor.
 		~SGUITTGlyph() { unload(); }