/*
Minetest
Copyright (C) 2010-2014 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "wieldmesh.h"
#include "settings.h"
#include "shader.h"
#include "inventory.h"
#include "client.h"
#include "itemdef.h"
#include "nodedef.h"
#include "mesh.h"
#include "content_mapblock.h"
#include "mapblock_mesh.h"
#include "client/meshgen/collector.h"
#include "client/tile.h"
#include "log.h"
#include "util/numeric.h"
#include <map>
#include <IMeshManipulator.h>

#define WIELD_SCALE_FACTOR 30.0
#define WIELD_SCALE_FACTOR_EXTRUDED 40.0

#define MIN_EXTRUSION_MESH_RESOLUTION 16
#define MAX_EXTRUSION_MESH_RESOLUTION 512

static scene::IMesh *createExtrusionMesh(int resolution_x, int resolution_y)
{
	const f32 r = 0.5;

	scene::IMeshBuffer *buf = new scene::SMeshBuffer();
	video::SColor c(255,255,255,255);
	v3f scale(1.0, 1.0, 0.1);

	// Front and back
	{
		video::S3DVertex vertices[8] = {
			// z-
			video::S3DVertex(-r,+r,-r, 0,0,-1, c, 0,0),
			video::S3DVertex(+r,+r,-r, 0,0,-1, c, 1,0),
			video::S3DVertex(+r,-r,-r, 0,0,-1, c, 1,1),
			video::S3DVertex(-r,-r,-r, 0,0,-1, c, 0,1),
			// z+
			video::S3DVertex(-r,+r,+r, 0,0,+1, c, 0,0),
			video::S3DVertex(-r,-r,+r, 0,0,+1, c, 0,1),
			video::S3DVertex(+r,-r,+r, 0,0,+1, c, 1,1),
			video::S3DVertex(+r,+r,+r, 0,0,+1, c, 1,0),
		};
		u16 indices[12] = {0,1,2,2,3,0,4,5,6,6,7,4};
		buf->append(vertices, 8, indices, 12);
	}

	f32 pixelsize_x = 1 / (f32) resolution_x;
	f32 pixelsize_y = 1 / (f32) resolution_y;

	for (int i = 0; i < resolution_x; ++i) {
		f32 pixelpos_x = i * pixelsize_x - 0.5;
		f32 x0 = pixelpos_x;
		f32 x1 = pixelpos_x + pixelsize_x;
		f32 tex0 = (i + 0.1) * pixelsize_x;
		f32 tex1 = (i + 0.9) * pixelsize_x;
		video::S3DVertex vertices[8] = {
			// x-
			video::S3DVertex(x0,-r,-r, -1,0,0, c, tex0,1),
			video::S3DVertex(x0,-r,+r, -1,0,0, c, tex1,1),
			video::S3DVertex(x0,+r,+r, -1,0,0, c, tex1,0),
			video::S3DVertex(x0,+r,-r, -1,0,0, c, tex0,0),
			// x+
			video::S3DVertex(x1,-r,-r, +1,0,0, c, tex0,1),
			video::S3DVertex(x1,+r,-r, +1,0,0, c, tex0,0),
			video::S3DVertex(x1,+r,+r, +1,0,0, c, tex1,0),
			video::S3DVertex(x1,-r,+r, +1,0,0, c, tex1,1),
		};
		u16 indices[12] = {0,1,2,2,3,0,4,5,6,6,7,4};
		buf->append(vertices, 8, indices, 12);
	}
	for (int i = 0; i < resolution_y; ++i) {
		f32 pixelpos_y = i * pixelsize_y - 0.5;
		f32 y0 = -pixelpos_y - pixelsize_y;
		f32 y1 = -pixelpos_y;
		f32 tex0 = (i + 0.1) * pixelsize_y;
		f32 tex1 = (i + 0.9) * pixelsize_y;
		video::S3DVertex vertices[8] = {
			// y-
			video::S3DVertex(-r,y0,-r, 0,-1,0, c, 0,tex0),
			video::S3DVertex(+r,y0,-r, 0,-1,0, c, 1,tex0),
			video::S3DVertex(+r,y0,+r, 0,-1,0, c, 1,tex1),
			video::S3DVertex(-r,y0,+r, 0,-1,0, c, 0,tex1),
			// y+
			video::S3DVertex(-r,y1,-r, 0,+1,0, c, 0,tex0),
			video::S3DVertex(-r,y1,+r, 0,+1,0, c, 0,tex1),
			video::S3DVertex(+r,y1,+r, 0,+1,0, c, 1,tex1),
			video::S3DVertex(+r,y1,-r, 0,+1,0, c, 1,tex0),
		};
		u16 indices[12] = {0,1,2,2,3,0,4,5,6,6,7,4};
		buf->append(vertices, 8, indices, 12);
	}

	// Create mesh object
	scene::SMesh *mesh = new scene::SMesh();
	mesh->addMeshBuffer(buf);
	buf->drop();
	scaleMesh(mesh, scale);  // also recalculates bounding box
	return mesh;
}

/*
	Caches extrusion meshes so that only one of them per resolution
	is needed. Also caches one cube (for convenience).

	E.g. there is a single extrusion mesh that is used for all
	16x16 px images, another for all 256x256 px images, and so on.

	WARNING: Not thread safe. This should not be a problem since
	rendering related classes (such as WieldMeshSceneNode) will be
	used from the rendering thread only.
*/
class ExtrusionMeshCache: public IReferenceCounted
{
public:
	// Constructor
	ExtrusionMeshCache()
	{
		for (int resolution = MIN_EXTRUSION_MESH_RESOLUTION;
				resolution <= MAX_EXTRUSION_MESH_RESOLUTION;
				resolution *= 2) {
			m_extrusion_meshes[resolution] =
				createExtrusionMesh(resolution, resolution);
		}
		m_cube = createCubeMesh(v3f(1.0, 1.0, 1.0));
	}
	// Destructor
	virtual ~ExtrusionMeshCache()
	{
		for (auto &extrusion_meshe : m_extrusion_meshes) {
			extrusion_meshe.second->drop();
		}
		m_cube->drop();
	}
	// Get closest extrusion mesh for given image dimensions
	// Caller must drop the returned pointer
	scene::IMesh* create(core::dimension2d<u32> dim)
	{
		// handle non-power of two textures inefficiently without cache
		if (!is_power_of_two(dim.Width) || !is_power_of_two(dim.Height)) {
			return createExtrusionMesh(dim.Width, dim.Height);
		}

		int maxdim = MYMAX(dim.Width, dim.Height);

		std::map<int, scene::IMesh*>::iterator
			it = m_extrusion_meshes.lower_bound(maxdim);

		if (it == m_extrusion_meshes.end()) {
			// no viable resolution found; use largest one
			it = m_extrusion_meshes.find(MAX_EXTRUSION_MESH_RESOLUTION);
			sanity_check(it != m_extrusion_meshes.end());
		}

		scene::IMesh *mesh = it->second;
		mesh->grab();
		return mesh;
	}
	// Returns a 1x1x1 cube mesh with one meshbuffer (material) per face
	// Caller must drop the returned pointer
	scene::IMesh* createCube()
	{
		m_cube->grab();
		return m_cube;
	}

private:
	std::map<int, scene::IMesh*> m_extrusion_meshes;
	scene::IMesh *m_cube;
};

ExtrusionMeshCache *g_extrusion_mesh_cache = NULL;


WieldMeshSceneNode::WieldMeshSceneNode(scene::ISceneManager *mgr, s32 id, bool lighting):
	scene::ISceneNode(mgr->getRootSceneNode(), mgr, id),
	m_material_type(video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF),
	m_lighting(lighting)
{
	m_enable_shaders = g_settings->getBool("enable_shaders");
	m_anisotropic_filter = g_settings->getBool("anisotropic_filter");
	m_bilinear_filter = g_settings->getBool("bilinear_filter");
	m_trilinear_filter = g_settings->getBool("trilinear_filter");

	// If this is the first wield mesh scene node, create a cache
	// for extrusion meshes (and a cube mesh), otherwise reuse it
	if (!g_extrusion_mesh_cache)
		g_extrusion_mesh_cache = new Extrus<span class="hl com">/*</span>
<span class="hl com">Minetest</span>
<span class="hl com">Copyright (C) 2017-2019 vlapsley, Vaughan Lapsley &lt;vlapsley&#64;gmail.com&gt;</span>
<span class="hl com">Copyright (C) 2017-2019 paramat</span>
<span class="hl com"></span>
<span class="hl com">This program is free software; you can redistribute it and/or modify</span>
<span class="hl com">it under the terms of the GNU Lesser General Public License as published by</span>
<span class="hl com">the Free Software Foundation; either version 2.1 of the License, or</span>
<span class="hl com">(at your option) any later version.</span>
<span class="hl com"></span>
<span class="hl com">This program is distributed in the hope that it will be useful,</span>
<span class="hl com">but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="hl com">MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="hl com">GNU Lesser General Public License for more details.</span>
<span class="hl com"></span>
<span class="hl com">You should have received a copy of the GNU Lesser General Public License along</span>
<span class="hl com">with this program; if not, write to the Free Software Foundation, Inc.,</span>
<span class="hl com">51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.</span>
<span class="hl com">*/</span>

<span class="hl ppc">#pragma once</span>

<span class="hl ppc">#include</span> <span class="hl pps">&quot;mapgen.h&quot;</span><span class="hl ppc"></span>

<span class="hl ppc">#define MGCARPATHIAN_CAVERNS 0x01</span>
<span class="hl ppc">#define MGCARPATHIAN_RIVERS  0x02</span>

<span class="hl kwc">class</span> BiomeManager<span class="hl opt">;</span>

<span class="hl kwc">extern</span> FlagDesc flagdesc_mapgen_carpathian<span class="hl opt">[];</span>


<span class="hl kwb">struct</span> MapgenCarpathianParams <span class="hl opt">:</span> <span class="hl kwc">public</span> MapgenParams
<span class="hl opt">{</span>
	<span class="hl kwb">float</span> base_level       <span class="hl opt">=</span> <span class="hl num">12.0</span>f<span class="hl opt">;</span>
	<span class="hl kwb">float</span> river_width      <span class="hl opt">=</span> <span class="hl num">0.05</span>f<span class="hl opt">;</span>
	<span class="hl kwb">float</span> river_depth      <span class="hl opt">=</span> <span class="hl num">24.0</span>f<span class="hl opt">;</span>
	<span class="hl kwb">float</span> valley_width     <span class="hl opt">=</span> <span class="hl num">0.25</span>f<span class="hl opt">;</span>

	u32 spflags              <span class="hl opt">=</span> MGCARPATHIAN_CAVERNS<span class="hl opt">;</span>
	<span class="hl kwb">float</span> cave_width         <span class="hl opt">=</span> <span class="hl num">0.09</span>f<span class="hl opt">;</span>
	s16 large_cave_depth     <span class="hl opt">= -</span><span class="hl num">33</span><span class="hl opt">;</span>
	u16 small_cave_num_min   <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	u16 small_cave_num_max   <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	u16 large_cave_num_min   <span class="hl opt">=</span> <span class="hl num">0</span><span class="hl opt">;</span>
	u16 large_cave_num_max   <span class="hl opt">=</span> <span class="hl num">2</span><span class="hl opt">;</span>
	<span class="hl kwb">float</span> large_cave_flooded <span class="hl opt">=</span> <span class="hl num">0.5</span>f<span class="hl opt">;</span>
	s16 cavern_limit         <span class="hl opt">= -</span><span class="hl num">256</span><span class="hl opt">;</span>
	s16 cavern_taper         <span class="hl opt">=</span> <span class="hl num">256</span><span class="hl opt">;</span>
	<span class="hl kwb">float</span> cavern_threshold   <span class="hl opt">=</span> <span class="hl num">0.7</span>f<span class="hl opt">;</span>
	s16 dungeon_ymin         <span class="hl opt">= -</span><span class="hl num">31000</span><span class="hl opt">;</span>
	s16 dungeon_ymax         <span class="hl opt">=</span> <span class="hl num">31000</span><span class="hl opt">;</span>

	NoiseParams np_filler_depth<span class="hl opt">;</span>
	NoiseParams np_height1<span class="hl opt">;</span>
	NoiseParams np_height2<span class="hl opt">;</span>
	NoiseParams np_height3<span class="hl opt">;</span>
	NoiseParams np_height4<span class="hl opt">;</span>
	NoiseParams np_hills_terrain<span class="hl opt">;</span>
	NoiseParams np_ridge_terrain<span class="hl opt">;</span>
	NoiseParams np_step_terrain<span class="hl opt">;</span>
	NoiseParams np_hills<span class="hl opt">;</span>
	NoiseParams np_ridge_mnt<span class="hl opt">;</span>
	NoiseParams np_step_mnt<span class="hl opt">;</span>
	NoiseParams np_rivers<span class="hl opt">;</span>
	NoiseParams np_mnt_var<span class="hl opt">;</span>
	NoiseParams np_cave1<span class="hl opt">;</span>
	NoiseParams np_cave2<span class="hl opt">;</span>
	NoiseParams np_cavern<span class="hl opt">;</span>
	NoiseParams np_dungeons<span class="hl opt">;</span>

	<span class="hl kwd">MapgenCarpathianParams</span><span class="hl opt">();</span>
	<span class="hl opt">~</span><span class="hl kwd">MapgenCarpathianParams</span><span class="hl opt">() =</span> <span class="hl kwa">default</span><span class="hl opt">;</span>

	<span class="hl kwb">void</span> <span class="hl kwd">readParams</span><span class="hl opt">(</span><span class="hl kwb">const</span> Settings <span class="hl opt">*</span>settings<span class="hl opt">);</span>
	<span class="hl kwb">void</span> <span class="hl kwd">writeParams</span><span class="hl opt">(</span>Settings <span class="hl opt">*</span>settings<span class="hl opt">)</span> <span class="hl kwb">const</span><span class="hl opt">;</span>
<span class="hl opt">};</span>

<span class="hl kwc">class</span> MapgenCarpathian <span class="hl opt">:</span> <span class="hl kwc">public</span> MapgenBasic
<span class="hl opt">{</span>
<span class="hl kwc">public</span><span class="hl opt">:</span>
	<span class="hl kwd">MapgenCarpathian</span><span class="hl opt">(</span>MapgenCarpathianParams <span class="hl opt">*</span>params<span class="hl opt">,</span> EmergeManager <span class="hl opt">*</span>emerge<span class="hl opt">);</span>
	<span class="hl opt">~</span><span class="hl kwd">MapgenCarpathian</span><span class="hl opt">();</span>

	<span class="hl kwc">virtual</span> MapgenType <span class="hl kwd">getType</span><span class="hl opt">()</span> <span class="hl kwb">const</span> <span class="hl opt">{</span> <span class="hl kwa">return</span> MAPGEN_CARPATHIAN<span class="hl opt">; }</span>

	<span class="hl kwc">virtual</span> <span class="hl kwb">void</span> <span class="hl kwd">makeChunk</span><span class="hl opt">(</span>BlockMakeData <span class="hl opt">*</span>data<span class="hl opt">);</span>
	<span class="hl kwb">int</span> <span class="hl kwd">getSpawnLevelAtPoint</span><span class="hl opt">(</span>v2s16 p<span class="hl opt">);</span>

<span class="hl kwc">private</span><span class="hl opt">:</span>
	<span class="hl kwb">float</span> base_level<span class="hl opt">;</span>
	<span class="hl kwb">float</span> river_width<span class="hl opt">;</span>
	<span class="hl kwb">float</span> river_depth<span class="hl opt">;</span>
	<span class="hl kwb">float</span> valley_width<span class="hl opt">;</span>

	Noise <span class="hl opt">*</span>noise_height1<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_height2<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_height3<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_height4<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_hills_terrain<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_ridge_terrain<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_step_terrain<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_hills<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_ridge_mnt<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_step_mnt<span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_rivers <span class="hl opt">=</span> <span class="hl kwc">nullptr</span><span class="hl opt">;</span>
	Noise <span class="hl opt">*</span>noise_mnt_var<span class="hl opt">;</span>

	s32 grad_wl<span class="hl opt">;</span>

	<span class="hl kwb">float</span> <span class="hl kwd">getSteps</span><span class="hl opt">(</span><span class="hl kwb">float</span> noise<span class="hl opt">);</span>
	<span class="hl kwc">inline</span> <span class="hl kwb">float</span> <span class="hl kwd">getLerp</span><span class="hl opt">(</span><span class="hl kwb">float</span> noise1<span class="hl opt">,</span> <span class="hl kwb">float</span> noise2<span class="hl opt">,</span> <span class="hl kwb">float</span> mod<span class="hl opt">);</span>
	<span class="hl kwb">int</span> <span class="hl kwd">generateTerrain</span><span class="hl opt">();</span>
<span class="hl opt">};</span>
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, m_lighting);
	m_meshnode->setVisible(true);
}

void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)
{
	ITextureSource *tsrc = client->getTextureSource();
	IItemDefManager *idef = client->getItemDefManager();
	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);

	FATAL_ERROR_IF(!g_extrusion_mesh_cache, "Extrusion mesh cache is not yet initialized");
	
	scene::SMesh *mesh = nullptr;

	// Shading is on by default
	result->needs_shading = true;

	// If inventory_image is defined, it overrides everything else
	if (!def.inventory_image.empty()) {
		mesh = getExtrudedMesh(tsrc, def.inventory_image,
			def.inventory_overlay);
		result->buffer_colors.emplace_back();
		// overlay is white, if present
		result->buffer_colors.emplace_back(true, video::SColor(0xFFFFFFFF));
		// Items with inventory images do not need shading
		result->needs_shading = false;
	} else if (def.type == ITEM_NODE) {
		if (f.mesh_ptr[0]) {
			mesh = cloneMesh(f.mesh_ptr[0]);
			scaleMesh(mesh, v3f(0.12, 0.12, 0.12));
			postProcessNodeMesh(mesh, f, false, false, nullptr,
				&result->buffer_colors);
		} else {
			switch (f.drawtype) {
				case NDT_PLANTLIKE: {
					mesh = getExtrudedMesh(tsrc,
						tsrc->getTextureName(f.tiles[0].layers[0].texture_id),
						tsrc->getTextureName(f.tiles[0].layers[1].texture_id));
					// Add color
					const TileLayer &l0 = f.tiles[0].layers[0];
					result->buffer_colors.emplace_back(l0.has_color, l0.color);
					const TileLayer &l1 = f.tiles[0].layers[1];
					result->buffer_colors.emplace_back(l1.has_color, l1.color);
					break;
				}
				case NDT_PLANTLIKE_ROOTED: {
					mesh = getExtrudedMesh(tsrc,
						tsrc->getTextureName(f.special_tiles[0].layers[0].texture_id), "");
					// Add color
					const TileLayer &l0 = f.special_tiles[0].layers[0];
					result->buffer_colors.emplace_back(l0.has_color, l0.color);
					break;
				}
				case NDT_NORMAL:
				case NDT_ALLFACES:
				case NDT_LIQUID:
				case NDT_FLOWINGLIQUID: {
					scene::IMesh *cube = g_extrusion_mesh_cache->createCube();
					mesh = cloneMesh(cube);
					cube->drop();
					scaleMesh(mesh, v3f(1.2, 1.2, 1.2));
					// add overlays
					postProcessNodeMesh(mesh, f, false, false, nullptr,
						&result->buffer_colors);
					break;
				}
				default: {
					mesh = createSpecialNodeMesh(client, id, &result->buffer_colors);
					scaleMesh(mesh, v3f(0.12, 0.12, 0.12));
				}
			}
		}

		u32 mc = mesh->getMeshBufferCount();
		for (u32 i = 0; i < mc; ++i) {
			scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
			video::SMaterial &material = buf->getMaterial();
			material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
			material.MaterialTypeParam = 0.5f;
			material.setFlag(video::EMF_BILINEAR_FILTER, false);
			material.setFlag(video::EMF_TRILINEAR_FILTER, false);
			material.setFlag(video::EMF_BACK_FACE_CULLING, true);
			material.setFlag(video::EMF_LIGHTING, false);
		}

		rotateMeshXZby(mesh, -45);
		rotateMeshYZby(mesh, -30);
	}
	result->mesh = mesh;
}



scene::SMesh *getExtrudedMesh(ITextureSource *tsrc,
	const std::string &imagename, const std::string &overlay_name)
{
	// check textures
	video::ITexture *texture = tsrc->getTextureForMesh(imagename);
	if (!texture) {
		return NULL;
	}
	video::ITexture *overlay_texture =
		(overlay_name.empty()) ? NULL : tsrc->getTexture(overlay_name);

	// get mesh
	core::dimension2d<u32> dim = texture->getSize();
	scene::IMesh *original = g_extrusion_mesh_cache->create(dim);
	scene::SMesh *mesh = cloneMesh(original);
	original->drop();

	//set texture
	mesh->getMeshBuffer(0)->getMaterial().setTexture(0,
		tsrc->getTexture(imagename));
	if (overlay_texture) {
		scene::IMeshBuffer *copy = cloneMeshBuffer(mesh->getMeshBuffer(0));
		copy->getMaterial().setTexture(0, overlay_texture);
		mesh->addMeshBuffer(copy);
		copy->drop();
	}
	// Customize materials
	for (u32 layer = 0; layer < mesh->getMeshBufferCount(); layer++) {
		video::SMaterial &material = mesh->getMeshBuffer(layer)->getMaterial();
		material.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
		material.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
		material.setFlag(video::EMF_BILINEAR_FILTER, false);
		material.setFlag(video::EMF_TRILINEAR_FILTER, false);
		material.setFlag(video::EMF_BACK_FACE_CULLING, true);
		material.setFlag(video::EMF_LIGHTING, false);
		material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
		material.MaterialTypeParam = 0.5f;
	}
	scaleMesh(mesh, v3f(2.0, 2.0, 2.0));

	return mesh;
}

void postProcessNodeMesh(scene::SMesh *mesh, const ContentFeatures &f,
	bool use_shaders, bool set_material, const video::E_MATERIAL_TYPE *mattype,
	std::vector<ItemPartColor> *colors, bool apply_scale)
{
	u32 mc = mesh->getMeshBufferCount();
	// Allocate colors for existing buffers
	colors->clear();
	for (u32 i = 0; i < mc; ++i)
		colors->push_back(ItemPartColor());

	for (u32 i = 0; i < mc; ++i) {
		const TileSpec *tile = &(f.tiles[i]);
		scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
		for (int layernum = 0; layernum < MAX_TILE_LAYERS; layernum++) {
			const TileLayer *layer = &tile->layers[layernum];
			if (layer->texture_id == 0)
				continue;
			if (layernum != 0) {
				scene::IMeshBuffer *copy = cloneMeshBuffer(buf);
				copy->getMaterial() = buf->getMaterial();
				mesh->addMeshBuffer(copy);
				copy->drop();
				buf = copy;
				colors->push_back(
					ItemPartColor(layer->has_color, layer->color));
			} else {
				(*colors)[i] = ItemPartColor(layer->has_color, layer->color);
			}
			video::SMaterial &material = buf->getMaterial();
			if (set_material)
				layer->applyMaterialOptions(material);
			if (mattype) {
				material.MaterialType = *mattype;
			}
			if (layer->animation_frame_count > 1) {
				const FrameSpec &animation_frame = (*layer->frames)[0];
				material.setTexture(0, animation_frame.texture);
			} else {
				material.setTexture(0, layer->texture);
			}
			if (use_shaders) {
				if (layer->normal_texture) {
					if (layer->animation_frame_count > 1) {
						const FrameSpec &animation_frame = (*layer->frames)[0];
						material.setTexture(1, animation_frame.normal_texture);
					} else
						material.setTexture(1, layer->normal_texture);
				}
				material.setTexture(2, layer->flags_texture);
			}
			if (apply_scale && tile->world_aligned) {
				u32 n = buf->getVertexCount();
				for (u32 k = 0; k != n; ++k)
					buf->getTCoords(k) /= layer->scale;
			}
		}
	}
}