Respect node alpha node for inventory drawing (#16556)

games/devtest/mods/testnodes/performance_test_nodes.lua

@@ -2,29 +2,22 @@
 
 local S = core.get_translator("testnodes")
 
--- Complex mesh
-core.register_node("testnodes:performance_mesh_clip", {
-	description = S("Performance Test Node") .. "\n" .. S("Marble with 'clip' transparency"),
+for use_texture_alpha, description in pairs({
+	opaque = S("Marble with 'opaque' transparency"),
+	clip = S("Marble with 'clip' transparency"),
+	blend = S("Marble with 'blend' transparency"),
+}) do
+	core.register_node("testnodes:performance_mesh_" .. use_texture_alpha, {
+		description = S("Performance Test Node") .. "\n" .. description,
 		drawtype = "mesh",
 		mesh = "testnodes_marble_glass.obj",
 		tiles = {"testnodes_marble_glass.png"},
 		paramtype = "light",
-	use_texture_alpha = "clip",
+		use_texture_alpha = use_texture_alpha,
 
 		groups = {dig_immediate=3},
-})
-
--- Complex mesh, alpha blending
-core.register_node("testnodes:performance_mesh_blend", {
-	description = S("Performance Test Node") .. "\n" .. S("Marble with 'blend' transparency"),
-	drawtype = "mesh",
-	mesh = "testnodes_marble_glass.obj",
-	tiles = {"testnodes_marble_glass.png"},
-	paramtype = "light",
-	use_texture_alpha = "blend",
-
-	groups = {dig_immediate=3},
-})
+	})
+end
 
 -- Overlay
 core.register_node("testnodes:performance_overlay_clip", {

src/client/wieldmesh.cpp

@@ -31,9 +31,10 @@
 #define MIN_EXTRUSION_MESH_RESOLUTION 16
 #define MAX_EXTRUSION_MESH_RESOLUTION 512
 
-ItemMeshBufferInfo::ItemMeshBufferInfo(const TileLayer &layer) :
+ItemMeshBufferInfo::ItemMeshBufferInfo(int layer_num, const TileLayer &layer) :
 		override_color(layer.color),
 		override_color_set(layer.has_color),
+		layer(layer_num),
 		animation_info((layer.material_flags & MATERIAL_FLAG_ANIMATION) ?
 			std::make_unique<AnimationInfo>(layer) :
 			nullptr)
@@ -131,6 +132,51 @@ static video::ITexture *extractTexture(const TileDef &def, const TileLayer &laye
 	return nullptr;
 }
 
+// (the function name represents the amount of time wasted on all of this)
+
+static void setAlphaBullshit(video::SMaterial &mat,
+		AlphaMode mode, bool overlay)
+{
+	switch (mode) {
+	case ALPHAMODE_BLEND:
+		mat.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+		mat.MaterialTypeParam = 0;
+		return;
+	case ALPHAMODE_OPAQUE:
+		if (!overlay) {
+			mat.MaterialType = video::EMT_SOLID;
+			return;
+		}
+		[[fallthrough]];
+	case ALPHAMODE_CLIP:
+	default:
+		mat.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
+		mat.MaterialTypeParam = 0.5f;
+		return;
+	}
+}
+
+static void setAlphaBullshit(video::SMaterial &mat, IShaderSource *shdsrc,
+		AlphaMode mode, bool overlay)
+{
+	MaterialType mt;
+	switch (mode) {
+	case ALPHAMODE_BLEND:
+		mt = TILE_MATERIAL_ALPHA;
+		break;
+	case ALPHAMODE_OPAQUE:
+		mt = overlay ? TILE_MATERIAL_BASIC : TILE_MATERIAL_OPAQUE;
+		break;
+	case ALPHAMODE_CLIP:
+	default:
+		mt = TILE_MATERIAL_BASIC;
+		break;
+	}
+
+	u32 shader_id = shdsrc->getShader("object_shader", mt, NDT_NORMAL);
+	mat.MaterialType = shdsrc->getShaderInfo(shader_id).material;
+}
+
 /*
 	Caches extrusion meshes so that only one of them per resolution
 	is needed. Also caches one cube (for convenience).
@@ -255,8 +301,8 @@ void WieldMeshSceneNode::setExtruded(const TileDef &d0, const TileLayer &l0,
 		extractTexture(d1, l1, tsrc), wield_scale);
 	// Add color
 	m_buffer_info.clear();
-	m_buffer_info.emplace_back(l0.has_color, l0.color);
-	m_buffer_info.emplace_back(l1.has_color, l1.color);
+	m_buffer_info.emplace_back(0, l0.has_color, l0.color);
+	m_buffer_info.emplace_back(1, l1.has_color, l1.color);
 }
 
 void WieldMeshSceneNode::setExtruded(const std::string &image,
@@ -359,7 +405,7 @@ static scene::SMesh *createGenericNodeMesh(Client *client, MapNode n,
 			p.layer.applyMaterialOptions(buf->Material, layer);
 
 			mesh->addMeshBuffer(buf.get());
-			buffer_info->emplace_back(p.layer);
+			buffer_info->emplace_back(layer, p.layer);
 		}
 	}
 	mesh->recalculateBoundingBox();
@@ -371,17 +417,19 @@ void WieldMeshSceneNode::setItem(const ItemStack &item, Client *client, bool che
 	ITextureSource *tsrc = client->getTextureSource();
 	IItemDefManager *idef = client->getItemDefManager();
 	ItemVisualsManager *item_visuals = client->getItemVisualsManager();
-	IShaderSource *shdrsrc = client->getShaderSource();
+	IShaderSource *shdsrc = client->getShaderSource();
 	const NodeDefManager *ndef = client->getNodeDefManager();
 	const ItemDefinition &def = item.getDefinition(idef);
 	const ContentFeatures &f = ndef->get(def.name);
-	content_t id = ndef->getId(def.name);
+
+	{
+		// Initialize material type used by setExtruded
+		u32 shader_id = shdsrc->getShader("object_shader", TILE_MATERIAL_BASIC, NDT_NORMAL);
+		m_material_type = shdsrc->getShaderInfo(shader_id).material;
+	}
 
 	scene::SMesh *mesh = nullptr;
 
-	u32 shader_id = shdrsrc->getShader("object_shader", TILE_MATERIAL_BASIC, NDT_NORMAL);
-	m_material_type = shdrsrc->getShaderInfo(shader_id).material;
-
 	// Color-related
 	m_buffer_info.clear();
 	m_base_color = item_visuals->getItemstackColor(item, client);
@@ -393,9 +441,9 @@ void WieldMeshSceneNode::setItem(const ItemStack &item, Client *client, bool che
 	// If wield_image needs to be checked and is defined, it overrides everything else
 	if (!wield_image.empty() && check_wield_image) {
 		setExtruded(wield_image, wield_overlay, wield_scale, tsrc);
-		m_buffer_info.emplace_back();
+		m_buffer_info.emplace_back(0);
 		// overlay is white, if present
-		m_buffer_info.emplace_back(true, video::SColor(0xFFFFFFFF));
+		m_buffer_info.emplace_back(1, true, video::SColor(0xFFFFFFFF));
 		// initialize the color
 		setColor(video::SColor(0xFFFFFFFF));
 		return;
@@ -403,7 +451,6 @@ void WieldMeshSceneNode::setItem(const ItemStack &item, Client *client, bool che
 
 	// Handle nodes
 	if (def.type == ITEM_NODE) {
-
 		switch (f.drawtype) {
 		case NDT_AIRLIKE:
 			setExtruded("no_texture_airlike.png", "",
@@ -429,7 +476,7 @@ void WieldMeshSceneNode::setItem(const ItemStack &item, Client *client, bool che
 		}
 		default: {
 			// Render all other drawtypes like the actual node
-			MapNode n(id);
+			MapNode n(ndef->getId(def.name));
 			if (def.place_param2)
 				n.setParam2(*def.place_param2);
 
@@ -446,9 +493,9 @@ void WieldMeshSceneNode::setItem(const ItemStack &item, Client *client, bool che
 		u32 material_count = m_meshnode->getMaterialCount();
 		for (u32 i = 0; i < material_count; ++i) {
 			video::SMaterial &material = m_meshnode->getMaterial(i);
-			// FIXME: we should take different alpha modes of the mesh into account here
-			material.MaterialType = m_material_type;
-			material.MaterialTypeParam = 0.5f;
+			// apply node's alpha mode
+			setAlphaBullshit(material, shdsrc, f.alpha,
+				m_buffer_info[i].layer == 1);
 			material.forEachTexture([this] (auto &tex) {
 				setMaterialFilters(tex, m_bilinear_filter, m_trilinear_filter,
 						m_anisotropic_filter);
@@ -467,9 +514,9 @@ void WieldMeshSceneNode::setItem(const ItemStack &item, Client *client, bool che
 			setExtruded("no_texture.png", "", def.wield_scale, tsrc);
 		}
 
-		m_buffer_info.emplace_back();
+		m_buffer_info.emplace_back(0);
 		// overlay is white, if present
-		m_buffer_info.emplace_back(true, video::SColor(0xFFFFFFFF));
+		m_buffer_info.emplace_back(1, true, video::SColor(0xFFFFFFFF));
 
 		// initialize the color
 		setColor(video::SColor(0xFFFFFFFF));
@@ -490,9 +537,9 @@ void WieldMeshSceneNode::setColor(video::SColor c)
 	u8 green = c.getGreen();
 	u8 blue = c.getBlue();
 
-	const u32 mc = mesh->getMeshBufferCount();
-	if (mc > m_buffer_info.size())
-		m_buffer_info.resize(mc);
+	u32 mc = mesh->getMeshBufferCount();
+	assert(mc <= m_buffer_info.size());
+	mc = std::min<u32>(mc, m_buffer_info.size());
 	for (u32 j = 0; j < mc; j++) {
 		video::SColor bc(m_base_color);
 		m_buffer_info[j].applyOverride(bc);
@@ -555,7 +602,7 @@ void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)
 	const NodeDefManager *ndef = client->getNodeDefManager();
 	const ItemDefinition &def = item.getDefinition(idef);
 	const ContentFeatures &f = ndef->get(def.name);
-	content_t id = ndef->getId(def.name);
+	assert(result);
 
 	FATAL_ERROR_IF(!g_extrusion_mesh_cache, "Extrusion mesh cache is not yet initialized");
 
@@ -569,14 +616,16 @@ void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)
 	const std::string inventory_overlay = item.getInventoryOverlay(idef);
 	if (!inventory_image.empty()) {
 		mesh = getExtrudedMesh(tsrc, inventory_image, inventory_overlay);
-		result->buffer_info.emplace_back();
+		result->buffer_info.emplace_back(0);
 		// overlay is white, if present
-		result->buffer_info.emplace_back(true, video::SColor(0xFFFFFFFF));
-		// Items with inventory images do not need shading
+		result->buffer_info.emplace_back(1, true, video::SColor(0xFFFFFFFF));
 		result->needs_shading = false;
 	} else if (def.type == ITEM_NODE && f.drawtype == NDT_AIRLIKE) {
 		// Fallback image for airlike node
 		mesh = getExtrudedMesh(tsrc, "no_texture_airlike.png", inventory_overlay);
+		result->buffer_info.emplace_back(0);
+		// overlay is white, if present
+		result->buffer_info.emplace_back(1, true, video::SColor(0xFFFFFFFF));
 		result->needs_shading = false;
 	} else if (def.type == ITEM_NODE) {
 		switch (f.drawtype) {
@@ -587,8 +636,8 @@ void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)
 				extractTexture(f.tiledef[0], l0, tsrc),
 				extractTexture(f.tiledef[1], l1, tsrc));
 			// Add color
-			result->buffer_info.emplace_back(l0.has_color, l0.color);
-			result->buffer_info.emplace_back(l1.has_color, l1.color);
+			result->buffer_info.emplace_back(0, l0.has_color, l0.color);
+			result->buffer_info.emplace_back(1, l1.has_color, l1.color);
 			break;
 		}
 		case NDT_PLANTLIKE_ROOTED: {
@@ -597,17 +646,17 @@ void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)
 			mesh = getExtrudedMesh(
 				extractTexture(f.tiledef_special[0], l0, tsrc), nullptr
 			);
-			result->buffer_info.emplace_back(l0.has_color, l0.color);
+			result->buffer_info.emplace_back(0, l0.has_color, l0.color);
 			break;
 		}
 		default: {
 			// Render all other drawtypes like the actual node
-			MapNode n(id);
+			MapNode n(ndef->getId(def.name));
 			if (def.place_param2)
 				n.setParam2(*def.place_param2);
 
 			mesh = createGenericNodeMesh(client, n, &result->buffer_info, f);
-			scaleMesh(mesh, v3f(0.12, 0.12, 0.12));
+			scaleMesh(mesh, v3f(0.12f));
 			break;
 		}
 		}
@@ -615,9 +664,9 @@ void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)
 		for (u32 i = 0; i < mesh->getMeshBufferCount(); ++i) {
 			scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
 			video::SMaterial &material = buf->getMaterial();
-			// FIXME: overriding this breaks different alpha modes the mesh may have
-			material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
-			material.MaterialTypeParam = 0.5f;
+			// apply node's alpha mode
+			setAlphaBullshit(material, f.alpha,
+				result->buffer_info[i].layer == 1);
 			material.forEachTexture([] (auto &tex) {
 				tex.MinFilter = video::ETMINF_NEAREST_MIPMAP_NEAREST;
 				tex.MagFilter = video::ETMAGF_NEAREST;
@@ -675,7 +724,7 @@ scene::SMesh *getExtrudedMesh(video::ITexture *texture,
 			tex.MagFilter = video::ETMAGF_NEAREST;
 		});
 		material.BackfaceCulling = true;
-		material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+		material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
 		material.MaterialTypeParam = 0.5f;
 	}
 	scaleMesh(mesh, v3f(2));

src/client/wieldmesh.h

@@ -49,13 +49,14 @@ class ItemMeshBufferInfo
 
 public:
 
-	ItemMeshBufferInfo() = default;
+	ItemMeshBufferInfo(int layer) : layer(layer) {}
 
-	ItemMeshBufferInfo(bool override, video::SColor color) :
-		override_color(color), override_color_set(override)
+	ItemMeshBufferInfo(int layer, bool override, video::SColor color) :
+		override_color(color), override_color_set(override),
+		layer(layer)
 	{}
 
-	ItemMeshBufferInfo(const TileLayer &layer);
+	ItemMeshBufferInfo(int layer_num, const TileLayer &layer);
 
 	void applyOverride(video::SColor &dest) const {
 		if (override_color_set)
@@ -70,6 +71,9 @@ public:
 		return true;
 	}
 
+	// Index of the tile layer this mesh buffer belongs to
+	u8 layer;
+
 	// Null for no animated parts
 	std::unique_ptr<AnimationInfo> animation_info;
 };
@@ -132,6 +136,7 @@ private:
 
 	// Child scene node with the current wield mesh
 	scene::IMeshSceneNode *m_meshnode = nullptr;
+	// Material types used as fallback
 	video::E_MATERIAL_TYPE m_material_type;
 
 	bool m_anisotropic_filter;
@@ -156,6 +161,10 @@ private:
 	ShadowRenderer *m_shadow;
 };
 
+/**
+ * NOTE: The item mesh is only suitable for inventory rendering (due to its
+ * material types). In-world rendering of items must go through WieldMeshSceneNode.
+ */
 void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result);
 
 scene::SMesh *getExtrudedMesh(video::ITexture *texture,

src/gui/drawItemStack.cpp

@@ -118,9 +118,9 @@ void drawItemStack(
 
 		video::SColor basecolor = item_visuals->getItemstackColor(item, client);
 
-		const u32 mc = mesh->getMeshBufferCount();
-		if (mc > imesh->buffer_info.size())
-			imesh->buffer_info.resize(mc);
+		u32 mc = mesh->getMeshBufferCount();
+		assert(mc <= imesh->buffer_info.size());
+		mc = std::min<u32>(mc, imesh->buffer_info.size());
 		for (u32 j = 0; j < mc; ++j) {
 			scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 			video::SColor c = basecolor;
@@ -144,7 +144,6 @@ void drawItemStack(
 				p.animation_info->updateTexture(material, client->getAnimationTime());
 			}
 
-			material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
 			driver->setMaterial(material);
 			driver->drawMeshBuffer(buf);
 		}