Move client-specific files to 'src/client' (#7902)

Update Android.mk
Remove 'src/client' from include_directories

1 files changed, 1135 insertions, 0 deletions

diff --git a/src/client/mesh.cpp b/src/client/mesh.cpp
new file mode 100644
index 000000000..7fc7531f2
--- /dev/null
+++ b/src/client/mesh.cpp
@@ -0,0 +1,1135 @@
+/*
+Minetest
+Copyright (C) 2010-2013 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 "mesh.h"
+#include "debug.h"
+#include "log.h"
+#include "irrMap.h"
+#include <iostream>
+#include <IAnimatedMesh.h>
+#include <SAnimatedMesh.h>
+#include <IAnimatedMeshSceneNode.h>
+
+// In Irrlicht 1.8 the signature of ITexture::lock was changed from
+// (bool, u32) to (E_TEXTURE_LOCK_MODE, u32).
+#if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR <= 7
+#define MY_ETLM_READ_ONLY true
+#else
+#define MY_ETLM_READ_ONLY video::ETLM_READ_ONLY
+#endif
+
+inline static void applyShadeFactor(video::SColor& color, float factor)
+{
+	color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
+	color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
+	color.setBlue(core::clamp(core::round32(color.getBlue()*factor), 0, 255));
+}
+
+void applyFacesShading(video::SColor &color, const v3f &normal)
+{
+	/*
+		Some drawtypes have normals set to (0, 0, 0), this must result in
+		maximum brightness: shade factor 1.0.
+		Shade factors for aligned cube faces are:
+		+Y 1.000000 sqrt(1.0)
+		-Y 0.447213 sqrt(0.2)
+		+-X 0.670820 sqrt(0.45)
+		+-Z 0.836660 sqrt(0.7)
+	*/
+	float x2 = normal.X * normal.X;
+	float y2 = normal.Y * normal.Y;
+	float z2 = normal.Z * normal.Z;
+	if (normal.Y < 0)
+		applyShadeFactor(color, 0.670820f * x2 + 0.447213f * y2 + 0.836660f * z2);
+	else if ((x2 > 1e-3) || (z2 > 1e-3))
+		applyShadeFactor(color, 0.670820f * x2 + 1.000000f * y2 + 0.836660f * z2);
+}
+
+scene::IAnimatedMesh* createCubeMesh(v3f scale)
+{
+	video::SColor c(255,255,255,255);
+	video::S3DVertex vertices[24] =
+	{
+		// Up
+		video::S3DVertex(-0.5,+0.5,-0.5, 0,1,0, c, 0,1),
+		video::S3DVertex(-0.5,+0.5,+0.5, 0,1,0, c, 0,0),
+		video::S3DVertex(+0.5,+0.5,+0.5, 0,1,0, c, 1,0),
+		video::S3DVertex(+0.5,+0.5,-0.5, 0,1,0, c, 1,1),
+		// Down
+		video::S3DVertex(-0.5,-0.5,-0.5, 0,-1,0, c, 0,0),
+		video::S3DVertex(+0.5,-0.5,-0.5, 0,-1,0, c, 1,0),
+		video::S3DVertex(+0.5,-0.5,+0.5, 0,-1,0, c, 1,1),
+		video::S3DVertex(-0.5,-0.5,+0.5, 0,-1,0, c, 0,1),
+		// Right
+		video::S3DVertex(+0.5,-0.5,-0.5, 1,0,0, c, 0,1),
+		video::S3DVertex(+0.5,+0.5,-0.5, 1,0,0, c, 0,0),
+		video::S3DVertex(+0.5,+0.5,+0.5, 1,0,0, c, 1,0),
+		video::S3DVertex(+0.5,-0.5,+0.5, 1,0,0, c, 1,1),
+		// Left
+		video::S3DVertex(-0.5,-0.5,-0.5, -1,0,0, c, 1,1),
+		video::S3DVertex(-0.5,-0.5,+0.5, -1,0,0, c, 0,1),
+		video::S3DVertex(-0.5,+0.5,+0.5, -1,0,0, c, 0,0),
+		video::S3DVertex(-0.5,+0.5,-0.5, -1,0,0, c, 1,0),
+		// Back
+		video::S3DVertex(-0.5,-0.5,+0.5, 0,0,1, c, 1,1),
+		video::S3DVertex(+0.5,-0.5,+0.5, 0,0,1, c, 0,1),
+		video::S3DVertex(+0.5,+0.5,+0.5, 0,0,1, c, 0,0),
+		video::S3DVertex(-0.5,+0.5,+0.5, 0,0,1, c, 1,0),
+		// Front
+		video::S3DVertex(-0.5,-0.5,-0.5, 0,0,-1, c, 0,1),
+		video::S3DVertex(-0.5,+0.5,-0.5, 0,0,-1, c, 0,0),
+		video::S3DVertex(+0.5,+0.5,-0.5, 0,0,-1, c, 1,0),
+		video::S3DVertex(+0.5,-0.5,-0.5, 0,0,-1, c, 1,1),
+	};
+
+	u16 indices[6] = {0,1,2,2,3,0};
+
+	scene::SMesh *mesh = new scene::SMesh();
+	for (u32 i=0; i<6; ++i)
+	{
+		scene::IMeshBuffer *buf = new scene::SMeshBuffer();
+		buf->append(vertices + 4 * i, 4, indices, 6);
+		// Set default material
+		buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
+		buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
+		buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
+		// Add mesh buffer to mesh
+		mesh->addMeshBuffer(buf);
+		buf->drop();
+	}
+
+	scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
+	mesh->drop();
+	scaleMesh(anim_mesh, scale);  // also recalculates bounding box
+	return anim_mesh;
+}
+
+void scaleMesh(scene::IMesh *mesh, v3f scale)
+{
+	if (mesh == NULL)
+		return;
+
+	aabb3f bbox;
+	bbox.reset(0, 0, 0);
+
+	u32 mc = mesh->getMeshBufferCount();
+	for (u32 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++)
+			((video::S3DVertex *)(vertices + i * stride))->Pos *= scale;
+
+		buf->recalculateBoundingBox();
+
+		// calculate total bounding box
+		if (j == 0)
+			bbox = buf->getBoundingBox();
+		else
+			bbox.addInternalBox(buf->getBoundingBox());
+	}
+	mesh->setBoundingBox(bbox);
+}
+
+void translateMesh(scene::IMesh *mesh, v3f vec)
+{
+	if (mesh == NULL)
+		return;
+
+	aabb3f bbox;
+	bbox.reset(0, 0, 0);
+
+	u32 mc = mesh->getMeshBufferCount();
+	for (u32 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++)
+			((video::S3DVertex *)(vertices + i * stride))->Pos += vec;
+
+		buf->recalculateBoundingBox();
+
+		// calculate total bounding box
+		if (j == 0)
+			bbox = buf->getBoundingBox();
+		else
+			bbox.addInternalBox(buf->getBoundingBox());
+	}
+	mesh->setBoundingBox(bbox);
+}
+
+void setMeshBufferColor(scene::IMeshBuffer *buf, const video::SColor &color)
+{
+	const u32 stride = getVertexPitchFromType(buf->getVertexType());
+	u32 vertex_count = buf->getVertexCount();
+	u8 *vertices = (u8 *) buf->getVertices();
+	for (u32 i = 0; i < vertex_count; i++)
+		((video::S3DVertex *) (vertices + i * stride))->Color = color;
+}
+
+void setAnimatedMeshColor(scene::IAnimatedMeshSceneNode *node, const video::SColor &color)
+{
+	for (u32 i = 0; i < node->getMaterialCount(); ++i) {
+		node->getMaterial(i).EmissiveColor = color;
+	}
+}
+
+void setMeshColor(scene::IMesh *mesh, const video::SColor &color)
+{
+	if (mesh == NULL)
+		return;
+
+	u32 mc = mesh->getMeshBufferCount();
+	for (u32 j = 0; j < mc; j++)
+		setMeshBufferColor(mesh->getMeshBuffer(j), color);
+}
+
+void colorizeMeshBuffer(scene::IMeshBuffer *buf, const video::SColor *buffercolor)
+{
+	const u32 stride = getVertexPitchFromType(buf->getVertexType());
+	u32 vertex_count = buf->getVertexCount();
+	u8 *vertices = (u8 *) buf->getVertices();
+	for (u32 i = 0; i < vertex_count; i++) {
+		video::S3DVertex *vertex = (video::S3DVertex *) (vertices + i * stride);
+		video::SColor *vc = &(vertex->Color);
+		// Reset color
+		*vc = *buffercolor;
+		// Apply shading
+		applyFacesShading(*vc, vertex->Normal);
+	}
+}
+
+void setMeshColorByNormalXYZ(scene::IMesh *mesh,
+		const video::SColor &colorX,
+		const video::SColor &colorY,
+		const video::SColor &colorZ)
+{
+	if (mesh == NULL)
+		return;
+
+	u16 mc = mesh->getMeshBufferCount();
+	for (u16 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++) {
+			video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
+			f32 x = fabs(vertex->Normal.X);
+			f32 y = fabs(vertex->Normal.Y);
+			f32 z = fabs(vertex->Normal.Z);
+			if (x >= y && x >= z)
+				vertex->Color = colorX;
+			else if (y >= z)
+				vertex->Color = colorY;
+			else
+				vertex->Color = colorZ;
+		}
+	}
+}
+
+void setMeshColorByNormal(scene::IMesh *mesh, const v3f &normal,
+		const video::SColor &color)
+{
+	if (!mesh)
+		return;
+
+	u16 mc = mesh->getMeshBufferCount();
+	for (u16 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++) {
+			video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
+			if (normal == vertex->Normal) {
+				vertex->Color = color;
+			}
+		}
+	}
+}
+
+void rotateMeshXYby(scene::IMesh *mesh, f64 degrees)
+{
+	u16 mc = mesh->getMeshBufferCount();
+	for (u16 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++)
+			((video::S3DVertex *)(vertices + i * stride))->Pos.rotateXYBy(degrees);
+	}
+}
+
+void rotateMeshXZby(scene::IMesh *mesh, f64 degrees)
+{
+	u16 mc = mesh->getMeshBufferCount();
+	for (u16 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++)
+			((video::S3DVertex *)(vertices + i * stride))->Pos.rotateXZBy(degrees);
+	}
+}
+
+void rotateMeshYZby(scene::IMesh *mesh, f64 degrees)
+{
+	u16 mc = mesh->getMeshBufferCount();
+	for (u16 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++)
+			((video::S3DVertex *)(vertices + i * stride))->Pos.rotateYZBy(degrees);
+	}
+}
+
+void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)
+{
+	int axisdir = facedir >> 2;
+	facedir &= 0x03;
+
+	u16 mc = mesh->getMeshBufferCount();
+	for (u16 j = 0; j < mc; j++) {
+		scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
+		const u32 stride = getVertexPitchFromType(buf->getVertexType());
+		u32 vertex_count = buf->getVertexCount();
+		u8 *vertices = (u8 *)buf->getVertices();
+		for (u32 i = 0; i < vertex_count; i++) {
+			video::S3DVertex *vertex = (video::S3DVertex *)(vertices + i * stride);
+			switch (axisdir) {
+				case 0:
+					if (facedir == 1)
+						vertex->Pos.rotateXZBy(-90);
+					else if (facedir == 2)
+						vertex->Pos.rotateXZBy(180);
+					else if (facedir == 3)
+						vertex->Pos.rotateXZBy(90);
+					break;
+				case 1: // z+
+					vertex->Pos.rotateYZBy(90);
+					if (facedir == 1)
+						vertex->Pos.rotateXYBy(90);
+					else if (facedir == 2)
+						vertex->Pos.rotateXYBy(180);
+					else if (facedir == 3)
+						vertex->Pos.rotateXYBy(-90);
+					break;
+				case 2: //z-
+					vertex->Pos.rotateYZBy(-90);
+					if (facedir == 1)
+						vertex->Pos.rotateXYBy(-90);
+					else if (facedir == 2)
+						vertex->Pos.rotateXYBy(180);
+					else if (facedir == 3)
+						vertex->Pos.rotateXYBy(90);
+					break;
+				case 3:  //x+
+					vertex->Pos.rotateXYBy(-90);
+					if (facedir == 1)
+						vertex->Pos.rotateYZBy(90);
+					else if (facedir == 2)
+						vertex->Pos.rotateYZBy(180);
+					else if (facedir == 3)
+						vertex->Pos.rotateYZBy(-90);
+					break;
+				case 4:  //x-
+					vertex->Pos.rotateXYBy(90);
+					if (facedir == 1)
+						vertex->Pos.rotateYZBy(-90);
+					else if (facedir == 2)
+						vertex->Pos.rotateYZBy(180);
+					else if (facedir == 3)
+						vertex->Pos.rotateYZBy(90);
+					break;
+				case 5:
+					vertex->Pos.rotateXYBy(-180);
+					if (facedir == 1)
+						vertex->Pos.rotateXZBy(90);
+					else if (facedir == 2)
+						vertex->Pos.rotateXZBy(180);
+					else if (facedir == 3)
+						vertex->Pos.rotateXZBy(-90);
+					break;
+				default:
+					break;
+			}
+		}
+	}
+}
+
+void recalculateBoundingBox(scene::IMesh *src_mesh)
+{
+	aabb3f bbox;
+	bbox.reset(0,0,0);
+	for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
+		scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
+		buf->recalculateBoundingBox();
+		if (j == 0)
+			bbox = buf->getBoundingBox();
+		else
+			bbox.addInternalBox(buf->getBoundingBox());
+	}
+	src_mesh->setBoundingBox(bbox);
+}
+
+scene::IMeshBuffer* cloneMeshBuffer(scene::IMeshBuffer *mesh_buffer)
+{
+	switch (mesh_buffer->getVertexType()) {
+	case video::EVT_STANDARD: {
+		video::S3DVertex *v = (video::S3DVertex *) mesh_buffer->getVertices();
+		u16 *indices = mesh_buffer->getIndices();
+		scene::SMeshBuffer *cloned_buffer = new scene::SMeshBuffer();
+		cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
+			mesh_buffer->getIndexCount());
+		return cloned_buffer;
+	}
+	case video::EVT_2TCOORDS: {
+		video::S3DVertex2TCoords *v =
+			(video::S3DVertex2TCoords *) mesh_buffer->getVertices();
+		u16 *indices = mesh_buffer->getIndices();
+		scene::SMeshBufferTangents *cloned_buffer =
+			new scene::SMeshBufferTangents();
+		cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
+			mesh_buffer->getIndexCount());
+		return cloned_buffer;
+	}
+	case video::EVT_TANGENTS: {
+		video::S3DVertexTangents *v =
+			(video::S3DVertexTangents *) mesh_buffer->getVertices();
+		u16 *indices = mesh_buffer->getIndices();
+		scene::SMeshBufferTangents *cloned_buffer =
+			new scene::SMeshBufferTangents();
+		cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
+			mesh_buffer->getIndexCount());
+		return cloned_buffer;
+	}
+	}
+	// This should not happen.
+	sanity_check(false);
+	return NULL;
+}
+
+scene::SMesh* cloneMesh(scene::IMesh *src_mesh)
+{
+	scene::SMesh* dst_mesh = new scene::SMesh();
+	for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
+		scene::IMeshBuffer *temp_buf = cloneMeshBuffer(
+			src_mesh->getMeshBuffer(j));
+		dst_mesh->addMeshBuffer(temp_buf);
+		temp_buf->drop();
+
+	}
+	return dst_mesh;
+}
+
+scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
+		const f32 *uv_coords, float expand)
+{
+	scene::SMesh* dst_mesh = new scene::SMesh();
+
+	for (u16 j = 0; j < 6; j++)
+	{
+		scene::IMeshBuffer *buf = new scene::SMeshBuffer();
+		buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
+		buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
+		dst_mesh->addMeshBuffer(buf);
+		buf->drop();
+	}
+
+	video::SColor c(255,255,255,255);
+
+	for (aabb3f box : boxes) {
+		box.repair();
+
+		box.MinEdge.X -= expand;
+		box.MinEdge.Y -= expand;
+		box.MinEdge.Z -= expand;
+		box.MaxEdge.X += expand;
+		box.MaxEdge.Y += expand;
+		box.MaxEdge.Z += expand;
+
+		// Compute texture UV coords
+		f32 tx1 = (box.MinEdge.X / BS) + 0.5;
+		f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
+		f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
+		f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
+		f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
+		f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;
+
+		f32 txc_default[24] = {
+			// up
+			tx1, 1 - tz2, tx2, 1 - tz1,
+			// down
+			tx1, tz1, tx2, tz2,
+			// right
+			tz1, 1 - ty2, tz2, 1 - ty1,
+			// left
+			1 - tz2, 1 - ty2, 1 - tz1, 1 - ty1,
+			// back
+			1 - tx2, 1 - ty2, 1 - tx1, 1 - ty1,
+			// front
+			tx1, 1 - ty2, tx2, 1 - ty1,
+		};
+
+		// use default texture UV mapping if not provided
+		const f32 *txc = uv_coords ? uv_coords : txc_default;
+
+		v3f min = box.MinEdge;
+		v3f max = box.MaxEdge;
+
+		video::S3DVertex vertices[24] =
+		{
+			// up
+			video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c, txc[0],txc[1]),
+			video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c, txc[2],txc[1]),
+			video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c, txc[2],txc[3]),
+			video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c, txc[0],txc[3]),
+			// down
+			video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c, txc[4],txc[5]),
+			video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c, txc[6],txc[5]),
+			video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c, txc[6],txc[7]),
+			video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c, txc[4],txc[7]),
+			// right
+			video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c, txc[ 8],txc[9]),
+			video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c, txc[10],txc[9]),
+			video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c, txc[10],txc[11]),
+			video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c, txc[ 8],txc[11]),
+			// left
+			video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c, txc[12],txc[13]),
+			video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c, txc[14],txc[13]),
+			video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c, txc[14],txc[15]),
+			video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c, txc[12],txc[15]),
+			// back
+			video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c, txc[16],txc[17]),
+			video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c, txc[18],txc[17]),
+			video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c, txc[18],txc[19]),
+			video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c, txc[16],txc[19]),
+			// front
+			video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c, txc[20],txc[21]),
+			video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c, txc[22],txc[21]),
+			video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c, txc[22],txc[23]),
+			video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c, txc[20],txc[23]),
+		};
+
+		u16 indices[] = {0,1,2,2,3,0};
+
+		for(u16 j = 0; j < 24; j += 4)
+		{
+			scene::IMeshBuffer *buf = dst_mesh->getMeshBuffer(j / 4);
+			buf->append(vertices + j, 4, indices, 6);
+		}
+	}
+	return dst_mesh;
+}
+
+struct vcache
+{
+	core::array<u32> tris;
+	float score;
+	s16 cachepos;
+	u16 NumActiveTris;
+};
+
+struct tcache
+{
+	u16 ind[3];
+	float score;
+	bool drawn;
+};
+
+const u16 cachesize = 32;
+
+float FindVertexScore(vcache *v)
+{
+	const float CacheDecayPower = 1.5f;
+	const float LastTriScore = 0.75f;
+	const float ValenceBoostScale = 2.0f;
+	const float ValenceBoostPower = 0.5f;
+	const float MaxSizeVertexCache = 32.0f;
+
+	if (v->NumActiveTris == 0)
+	{
+		// No tri needs this vertex!
+		return -1.0f;
+	}
+
+	float Score = 0.0f;
+	int CachePosition = v->cachepos;
+	if (CachePosition < 0)
+	{
+		// Vertex is not in FIFO cache - no score.
+	}
+	else
+	{
+		if (CachePosition < 3)
+		{
+			// This vertex was used in the last triangle,
+			// so it has a fixed score.
+			Score = LastTriScore;
+		}
+		else
+		{
+			// Points for being high in the cache.
+			const float Scaler = 1.0f / (MaxSizeVertexCache - 3);
+			Score = 1.0f - (CachePosition - 3) * Scaler;
+			Score = powf(Score, CacheDecayPower);
+		}
+	}
+
+	// Bonus points for having a low number of tris still to
+	// use the vert, so we get rid of lone verts quickly.
+	float ValenceBoost = powf(v->NumActiveTris,
+				-ValenceBoostPower);
+	Score += ValenceBoostScale * ValenceBoost;
+
+	return Score;
+}
+
+/*
+	A specialized LRU cache for the Forsyth algorithm.
+*/
+
+class f_lru
+{
+
+public:
+	f_lru(vcache *v, tcache *t): vc(v), tc(t)
+	{
+		for (int &i : cache) {
+			i = -1;
+		}
+	}
+
+	// Adds this vertex index and returns the highest-scoring triangle index
+	u32 add(u16 vert, bool updatetris = false)
+	{
+		bool found = false;
+
+		// Mark existing pos as empty
+		for (u16 i = 0; i < cachesize; i++)
+		{
+			if (cache[i] == vert)
+			{
+				// Move everything down
+				for (u16 j = i; j; j--)
+				{
+					cache[j] = cache[j - 1];
+				}
+
+				found = true;
+				break;
+			}
+		}
+
+		if (!found)
+		{
+			if (cache[cachesize-1] != -1)
+				vc[cache[cachesize-1]].cachepos = -1;
+
+			// Move everything down
+			for (u16 i = cachesize - 1; i; i--)
+			{
+				cache[i] = cache[i - 1];
+			}
+		}
+
+		cache[0] = vert;
+
+		u32 highest = 0;
+		float hiscore = 0;
+
+		if (updatetris)
+		{
+			// Update cache positions
+			for (u16 i = 0; i < cachesize; i++)
+			{
+				if (cache[i] == -1)
+					break;
+
+				vc[cache[i]].cachepos = i;
+				vc[cache[i]].score = FindVertexScore(&vc[cache[i]]);
+			}
+
+			// Update triangle scores
+			for (int i : cache) {
+				if (i == -1)
+					break;
+
+				const u16 trisize = vc[i].tris.size();
+				for (u16 t = 0; t < trisize; t++)
+				{
+					tcache *tri = &tc[vc[i].tris[t]];
+
+					tri->score =
+						vc[tri->ind[0]].score +
+						vc[tri->ind[1]].score +
+						vc[tri->ind[2]].score;
+
+					if (tri->score > hiscore)
+					{
+						hiscore = tri->score;
+						highest = vc[i].tris[t];
+					}
+				}
+			}
+		}
+
+		return highest;
+	}
+
+private:
+	s32 cache[cachesize];
+	vcache *vc;
+	tcache *tc;
+};
+
+/**
+Vertex cache optimization according to the Forsyth paper:
+http://home.comcast.net/~tom_forsyth/papers/fast_vert_cache_opt.html
+
+The function is thread-safe (read: you can optimize several meshes in different threads)
+
+\param mesh Source mesh for the operation.  */
+scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh)
+{
+	if (!mesh)
+		return 0;
+
+	scene::SMesh *newmesh = new scene::SMesh();
+	newmesh->BoundingBox = mesh->getBoundingBox();
+
+	const u32 mbcount = mesh->getMeshBufferCount();
+
+	for (u32 b = 0; b < mbcount; ++b)
+	{
+		const scene::IMeshBuffer *mb = mesh->getMeshBuffer(b);
+
+		if (mb->getIndexType() != video::EIT_16BIT)
+		{
+			//os::Printer::log("Cannot optimize a mesh with 32bit indices", ELL_ERROR);
+			newmesh->drop();
+			return 0;
+		}
+
+		const u32 icount = mb->getIndexCount();
+		const u32 tcount = icount / 3;
+		const u32 vcount = mb->getVertexCount();
+		const u16 *ind = mb->getIndices();
+
+		vcache *vc = new vcache[vcount];
+		tcache *tc = new tcache[tcount];
+
+		f_lru lru(vc, tc);
+
+		// init
+		for (u16 i = 0; i < vcount; i++)
+		{
+			vc[i].score = 0;
+			vc[i].cachepos = -1;
+			vc[i].NumActiveTris = 0;
+		}
+
+		// First pass: count how many times a vert is used
+		for (u32 i = 0; i < icount; i += 3)
+		{
+			vc[ind[i]].NumActiveTris++;
+			vc[ind[i + 1]].NumActiveTris++;
+			vc[ind[i + 2]].NumActiveTris++;
+
+			const u32 tri_ind = i/3;
+			tc[tri_ind].ind[0] = ind[i];
+			tc[tri_ind].ind[1] = ind[i + 1];
+			tc[tri_ind].ind[2] = ind[i + 2];
+		}
+
+		// Second pass: list of each triangle
+		for (u32 i = 0; i < tcount; i++)
+		{
+			vc[tc[i].ind[0]].tris.push_back(i);
+			vc[tc[i].ind[1]].tris.push_back(i);
+			vc[tc[i].ind[2]].tris.push_back(i);
+
+			tc[i].drawn = false;
+		}
+
+		// Give initial scores
+		for (u16 i = 0; i < vcount; i++)
+		{
+			vc[i].score = FindVertexScore(&vc[i]);
+		}
+		for (u32 i = 0; i < tcount; i++)
+		{
+			tc[i].score =
+					vc[tc[i].ind[0]].score +
+					vc[tc[i].ind[1]].score +
+					vc[tc[i].ind[2]].score;
+		}
+
+		switch(mb->getVertexType())
+		{
+			case video::EVT_STANDARD:
+			{
+				video::S3DVertex *v = (video::S3DVertex *) mb->getVertices();
+
+				scene::SMeshBuffer *buf = new scene::SMeshBuffer();
+				buf->Material = mb->getMaterial();
+
+				buf->Vertices.reallocate(vcount);
+				buf->Indices.reallocate(icount);
+
+				core::map<const video::S3DVertex, const u16> sind; // search index for fast operation
+				typedef core::map<const video::S3DVertex, const u16>::Node snode;
+
+				// Main algorithm
+				u32 highest = 0;
+				u32 drawcalls = 0;
+				for (;;)
+				{
+					if (tc[highest].drawn)
+					{
+						bool found = false;
+						float hiscore = 0;
+						for (u32 t = 0; t < tcount; t++)
+						{
+							if (!tc[t].drawn)
+							{
+								if (tc[t].score > hiscore)
+								{
+									highest = t;
+									hiscore = tc[t].score;
+									found = true;
+								}
+							}
+						}
+						if (!found)
+							break;
+					}
+
+					// Output the best triangle
+					u16 newind = buf->Vertices.size();
+
+					snode *s = sind.find(v[tc[highest].ind[0]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[0]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[0]], newind);
+						newind++;
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					s = sind.find(v[tc[highest].ind[1]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[1]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[1]], newind);
+						newind++;
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					s = sind.find(v[tc[highest].ind[2]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[2]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[2]], newind);
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					vc[tc[highest].ind[0]].NumActiveTris--;
+					vc[tc[highest].ind[1]].NumActiveTris--;
+					vc[tc[highest].ind[2]].NumActiveTris--;
+
+					tc[highest].drawn = true;
+
+					for (u16 j : tc[highest].ind) {
+						vcache *vert = &vc[j];
+						for (u16 t = 0; t < vert->tris.size(); t++)
+						{
+							if (highest == vert->tris[t])
+							{
+								vert->tris.erase(t);
+								break;
+							}
+						}
+					}
+
+					lru.add(tc[highest].ind[0]);
+					lru.add(tc[highest].ind[1]);
+					highest = lru.add(tc[highest].ind[2], true);
+					drawcalls++;
+				}
+
+				buf->setBoundingBox(mb->getBoundingBox());
+				newmesh->addMeshBuffer(buf);
+				buf->drop();
+			}
+			break;
+			case video::EVT_2TCOORDS:
+			{
+				video::S3DVertex2TCoords *v = (video::S3DVertex2TCoords *) mb->getVertices();
+
+				scene::SMeshBufferLightMap *buf = new scene::SMeshBufferLightMap();
+				buf->Material = mb->getMaterial();
+
+				buf->Vertices.reallocate(vcount);
+				buf->Indices.reallocate(icount);
+
+				core::map<const video::S3DVertex2TCoords, const u16> sind; // search index for fast operation
+				typedef core::map<const video::S3DVertex2TCoords, const u16>::Node snode;
+
+				// Main algorithm
+				u32 highest = 0;
+				u32 drawcalls = 0;
+				for (;;)
+				{
+					if (tc[highest].drawn)
+					{
+						bool found = false;
+						float hiscore = 0;
+						for (u32 t = 0; t < tcount; t++)
+						{
+							if (!tc[t].drawn)
+							{
+								if (tc[t].score > hiscore)
+								{
+									highest = t;
+									hiscore = tc[t].score;
+									found = true;
+								}
+							}
+						}
+						if (!found)
+							break;
+					}
+
+					// Output the best triangle
+					u16 newind = buf->Vertices.size();
+
+					snode *s = sind.find(v[tc[highest].ind[0]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[0]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[0]], newind);
+						newind++;
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					s = sind.find(v[tc[highest].ind[1]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[1]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[1]], newind);
+						newind++;
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					s = sind.find(v[tc[highest].ind[2]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[2]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[2]], newind);
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					vc[tc[highest].ind[0]].NumActiveTris--;
+					vc[tc[highest].ind[1]].NumActiveTris--;
+					vc[tc[highest].ind[2]].NumActiveTris--;
+
+					tc[highest].drawn = true;
+
+					for (u16 j : tc[highest].ind) {
+						vcache *vert = &vc[j];
+						for (u16 t = 0; t < vert->tris.size(); t++)
+						{
+							if (highest == vert->tris[t])
+							{
+								vert->tris.erase(t);
+								break;
+							}
+						}
+					}
+
+					lru.add(tc[highest].ind[0]);
+					lru.add(tc[highest].ind[1]);
+					highest = lru.add(tc[highest].ind[2]);
+					drawcalls++;
+				}
+
+				buf->setBoundingBox(mb->getBoundingBox());
+				newmesh->addMeshBuffer(buf);
+				buf->drop();
+
+			}
+			break;
+			case video::EVT_TANGENTS:
+			{
+				video::S3DVertexTangents *v = (video::S3DVertexTangents *) mb->getVertices();
+
+				scene::SMeshBufferTangents *buf = new scene::SMeshBufferTangents();
+				buf->Material = mb->getMaterial();
+
+				buf->Vertices.reallocate(vcount);
+				buf->Indices.reallocate(icount);
+
+				core::map<const video::S3DVertexTangents, const u16> sind; // search index for fast operation
+				typedef core::map<const video::S3DVertexTangents, const u16>::Node snode;
+
+				// Main algorithm
+				u32 highest = 0;
+				u32 drawcalls = 0;
+				for (;;)
+				{
+					if (tc[highest].drawn)
+					{
+						bool found = false;
+						float hiscore = 0;
+						for (u32 t = 0; t < tcount; t++)
+						{
+							if (!tc[t].drawn)
+							{
+								if (tc[t].score > hiscore)
+								{
+									highest = t;
+									hiscore = tc[t].score;
+									found = true;
+								}
+							}
+						}
+						if (!found)
+							break;
+					}
+
+					// Output the best triangle
+					u16 newind = buf->Vertices.size();
+
+					snode *s = sind.find(v[tc[highest].ind[0]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[0]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[0]], newind);
+						newind++;
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					s = sind.find(v[tc[highest].ind[1]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[1]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[1]], newind);
+						newind++;
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					s = sind.find(v[tc[highest].ind[2]]);
+
+					if (!s)
+					{
+						buf->Vertices.push_back(v[tc[highest].ind[2]]);
+						buf->Indices.push_back(newind);
+						sind.insert(v[tc[highest].ind[2]], newind);
+					}
+					else
+					{
+						buf->Indices.push_back(s->getValue());
+					}
+
+					vc[tc[highest].ind[0]].NumActiveTris--;
+					vc[tc[highest].ind[1]].NumActiveTris--;
+					vc[tc[highest].ind[2]].NumActiveTris--;
+
+					tc[highest].drawn = true;
+
+					for (u16 j : tc[highest].ind) {
+						vcache *vert = &vc[j];
+						for (u16 t = 0; t < vert->tris.size(); t++)
+						{
+							if (highest == vert->tris[t])
+							{
+								vert->tris.erase(t);
+								break;
+							}
+						}
+					}
+
+					lru.add(tc[highest].ind[0]);
+					lru.add(tc[highest].ind[1]);
+					highest = lru.add(tc[highest].ind[2]);
+					drawcalls++;
+				}
+
+				buf->setBoundingBox(mb->getBoundingBox());
+				newmesh->addMeshBuffer(buf);
+				buf->drop();
+			}
+			break;
+		}
+
+		delete [] vc;
+		delete [] tc;
+
+	} // for each meshbuffer
+
+	return newmesh;
+}