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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 "mesh.h"
#include "log.h"
#include <cassert>
#include <iostream>
#include <IAnimatedMesh.h>
#include <SAnimatedMesh.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

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;
}

static scene::IAnimatedMesh* extrudeARGB(u32 twidth, u32 theight, u8 *data)
{
	const s32 argb_wstep = 4 * twidth;
	const s32 alpha_threshold = 1;

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

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

	// "Interior"
	// (add faces where a solid pixel is next to a transparent one)
	u8 *solidity = new u8[(twidth+2) * (theight+2)];
	u32 wstep = twidth + 2;
	for (u32 y = 0; y < theight + 2; ++y)
	{
		u8 *scanline = solidity + y * wstep;
		if (y == 0 || y == theight + 1)
		{
			for (u32 x = 0; x < twidth + 2; ++x)
				scanline[x] = 0;
		}
		else
		{
			scanline[0] = 0;
			u8 *argb_scanline = data + (y - 1) * argb_wstep;
			for (u32 x = 0; x < twidth; ++x)
				scanline[x+1] = (argb_scanline[x*4+3] >= alpha_threshold);
			scanline[twidth + 1] = 0;
		}
	}

	// without this, there would be occasional "holes" in the mesh
	f32 eps = 0.01;

	for (u32 y = 0; y <= theight; ++y)
	{
		u8 *scanline = solidity + y * wstep + 1;
		for (u32 x = 0; x <= twidth; ++x)
		{
			if (scanline[x] && !scanline[x + wstep])
			{
				u32 xx = x + 1;
				while (scanline[xx] && !scanline[xx + wstep])
					++xx;
				f32 vx1 = (x - eps) / (f32) twidth - 0.5;
				f32 vx2 = (xx + eps) / (f32) twidth - 0.5;
				f32 vy = 0.5 - (y - eps) / (f32) theight;
				f32 tx1 = x / (f32) twidth;
				f32 tx2 = xx / (f32) twidth;
				f32 ty = (y - 0.5) / (f32) theight;
				video::S3DVertex vertices[8] =
				{
					video::S3DVertex(vx1,vy,-0.5, 0,-1,0, c, tx1,ty),
					video::S3DVertex(vx2,vy,-0.5, 0,-1,0, c, tx2,ty),
					video::S3DVertex(vx2,vy,+0.5, 0,-1,0, c, tx2,ty),
					video::S3DVertex(vx1,vy,+0.5, 0,-1,0, c, tx1,ty),
				};
				u16 indices[6] = {0,1,2,2,3,0};
				buf->append(vertices, 4, indices, 6);
				x = xx - 1;
			}
			if (!scanline[x] && scanline[x + wstep])
			{
				u32 xx = x + 1;
				while (!scanline[xx] && scanline[xx + wstep])
					++xx;
				f32 vx1 = (x - eps) / (f32) twidth - 0.5;
				f32 vx2 = (xx + eps) / (f32) twidth - 0.5;
				f32 vy = 0.5 - (y + eps) / (f32) theight;
				f32 tx1 = x / (f32) twidth;
				f32 tx2 = xx / (f32) twidth;
				f32 ty = (y + 0.5) / (f32) theight;
				video::S3DVertex vertices[8] =
				{
					video::S3DVertex(vx1,vy,-0.5, 0,1,0, c, tx1,ty),
					video::S3DVertex(vx1,vy,+0.5, 0,1,0, c, tx1,ty),
					video::S3DVertex(vx2,vy,+0.5, 0,1,0, c, tx2,ty),
					video::S3DVertex(vx2,vy,-0.5, 0,1,0, c, tx2,ty),
				};
				u16 indices[6] = {0,1,2,2,3,0};
				buf->append(vertices, 4, indices, 6);
				x = xx - 1;
			}
		}
	}

	for (u32 x = 0; x <= twidth; ++x)
	{
		u8 *scancol = solidity + x + wstep;
		for (u32 y = 0; y <= theight; ++y)
		{
			if (scancol[y * wstep] && !scancol[y * wstep + 1])
			{
				u32 yy = y + 1;
				while (scancol[yy * wstep] && !scancol[yy * wstep + 1])
					++yy;
				f32 vx = (x - eps) / (f32) twidth - 0.5;
				f32 vy1 = 0.5 - (y - eps) / (f32) theight;
				f32 vy2 = 0.5 - (yy + eps) / (f32) theight;
				f32 tx = (x - 0.5) / (f32) twidth;
				f32 ty1 = y / (f32) theight;
				f32 ty2 = yy / (f32) theight;
				video::S3DVertex vertices[8] =
				{
					video::S3DVertex(vx,vy1,-0.5, 1,0,0, c, tx,ty1),
					video::S3DVertex(vx,vy1,+0.5, 1,0,0, c, tx,ty1),
					video::S3DVertex(vx,vy2,+0.5, 1,0,0, c, tx,ty2),
					video::S3DVertex(vx,vy2,-0.5, 1,0,0, c, tx,ty2),
				};
				u16 indices[6] = {0,1,2,2,3,0};
				buf->append(vertices, 4, indices, 6);
				y = yy - 1;
			}
			if (!scancol[y * wstep] && scancol[y * wstep + 1])
			{
				u32 yy = y + 1;
				while (!scancol[yy * wstep] && scancol[yy * wstep + 1])
					++yy;
				f32 vx = (x + eps) / (f32) twidth - 0.5;
				f32 vy1 = 0.5 - (y - eps) / (f32) theight;
				f32 vy2 = 0.5 - (yy + eps) / (f32) theight;
				f32 tx = (x + 0.5) / (f32) twidth;
				f32 ty1 = y / (f32) theight;
				f32 ty2 = yy / (f32) theight;
				video::S3DVertex vertices[8] =
				{
					video::S3DVertex(vx,vy1,-0.5, -1,0,0, c, tx,ty1),
					video::S3DVertex(vx,vy2,-0.5, -1,0,0, c, tx,ty2),
					video::S3DVertex(vx,vy2,+0.5, -1,0,0, c, tx,ty2),
					video::S3DVertex(vx,vy1,+0.5, -1,0,0, c, tx,ty1),
				};
				u16 indices[6] = {0,1,2,2,3,0};
				buf->append(vertices, 4, indices, 6);
				y = yy - 1;
			}
		}
	}

	delete[] solidity;

	// Add to mesh
	scene::SMesh *mesh = new scene::SMesh();
	mesh->addMeshBuffer(buf);
	buf->drop();
	scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);