src/content_mapblock.cpp


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/*
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 "content_mapblock.h"
#include "util/numeric.h"
#include "util/directiontables.h"
#include "mapblock_mesh.h" // For MapBlock_LightColor() and MeshCollector
#include "settings.h"
#include "nodedef.h"
#include "client/tile.h"
#include "mesh.h"
#include <IMeshManipulator.h>
#include "gamedef.h"
#include "log.h"


// Create a cuboid.
//  collector - the MeshCollector for the resulting polygons
//  box       - the position and size of the box
//  tiles     - the tiles (materials) to use (for all 6 faces)
//  tilecount - number of entries in tiles, 1<=tilecount<=6
//  c         - vertex colour - used for all
//  txc       - texture coordinates - this is a list of texture coordinates
//              for the opposite corners of each face - therefore, there
//              should be (2+2)*6=24 values in the list. Alternatively, pass
//              NULL to use the entire texture for each face. The order of
//              the faces in the list is up-down-right-left-back-front
//              (compatible with ContentFeatures). If you specified 0,0,1,1
//              for each face, that would be the same as passing NULL.
void makeCuboid(MeshCollector *collector, const aabb3f &box,
	TileSpec *tiles, int tilecount, video::SColor &c, const f32* txc)
{
	assert(tilecount >= 1 && tilecount <= 6); // pre-condition

	v3f min = box.MinEdge;
	v3f max = box.MaxEdge;
 
 
	if(txc == NULL) {
		static const f32 txc_default[24] = {
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1,
			0,0,1,1
		};
		txc = txc_default;
	}

	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]),
	};

	for(int i = 0; i < 6; i++)
				{
				switch (tiles[MYMIN(i, tilecount-1)].rotation)
				{
				case 0:
					break;
				case 1: //R90
					for (int x = 0; x < 4; x++)
						vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
					break;
				case 2: //R180
					for (int x = 0; x < 4; x++)
						vertices[i*4+x].TCoords.rotateBy(180,irr::core::vector2df(0, 0));
					break;
				case 3: //R270
					for (int x = 0; x < 4; x++)
						vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
					break;
				case 4: //FXR90
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
						vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
					}
					break;
				case 5: //FXR270
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
						vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
					}
					break;
				case 6: //FYR90
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
						vertices[i*4+x].TCoords.rotateBy(90,irr::core::vector2df(0, 0));
					}
					break;
				case 7: //FYR270
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
						vertices[i*4+x].TCoords.rotateBy(270,irr::core::vector2df(0, 0));
					}
					break;
				case 8: //FX
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.X = 1.0 - vertices[i*4+x].TCoords.X;
					}
					break;
				case 9: //FY
					for (int x = 0; x < 4; x++){
						vertices[i*4+x].TCoords.Y = 1.0 - vertices[i*4+x].TCoords.Y;
					}
					break;
				default:
					break;
				}
			}
	u16 indices[] = {0,1,2,2,3,0};
	// Add to mesh collector
	for (s32 j = 0; j < 24; j += 4) {
		int tileindex = MYMIN(j / 4, tilecount - 1);
		collector->append(tiles[tileindex], vertices + j, 4, indices, 6);
	}
}

/*
	TODO: Fix alpha blending for special nodes
	Currently only the last element rendered is blended correct
*/
void mapblock_mesh_generate_special(MeshMakeData *data,
		MeshCollector &collector)
{
	INodeDefManager *nodedef = data->m_gamedef->ndef();
	ITextureSource *tsrc = data->m_gamedef->tsrc();
	scene::ISceneManager* smgr = data->m_gamedef->getSceneManager();
	scene::IMeshManipulator* meshmanip = smgr->getMeshManipulator();

	// 0ms
	//TimeTaker timer("mapblock_mesh_generate_special()");

	/*