bgfx/examples/02-metaballs/metaballs.cpp

/*
 * Copyright 2011-2012 Branimir Karadzic. All rights reserved.
 * License: http://www.opensource.org/licenses/BSD-2-Clause
 */

#include <bgfx.h>
#include <bx/bx.h>
#include <bx/timer.h>
#include "../common/dbg.h"
#include "../common/math.h"

#include <stdio.h>
#include <string.h>

bgfx::VertexDecl s_PosNormalColorDecl;

void fatalCb(bgfx::Fatal::Enum _code, const char* _str)
{
	DBG("%x: %s", _code, _str);
}

struct PosNormalColorVertex
{
	float m_pos[3];
	float m_normal[3];
	uint32_t m_abgr;
};

struct Grid
{
	Grid()
		: m_val(0.0f)
	{
		m_normal[0] = 0.0f;
		m_normal[1] = 0.0f;
		m_normal[2] = 0.0f;
	}

	float m_val;
	float m_normal[3];
};

static const char* s_shaderPath = NULL;

static void shaderFilePath(char* _out, const char* _name)
{
	strcpy(_out, s_shaderPath);
	strcat(_out, _name);
	strcat(_out, ".bin");
}

long int fsize(FILE* _file)
{
	long int pos = ftell(_file);
	fseek(_file, 0L, SEEK_END);
	long int size = ftell(_file);
	fseek(_file, pos, SEEK_SET);
	return size;
}

static const bgfx::Memory* load(const char* _filePath)
{
	FILE* file = fopen(_filePath, "rb");
	if (NULL != file)
	{
		uint32_t size = (uint32_t)fsize(file);
		const bgfx::Memory* mem = bgfx::alloc(size+1);
		fread(mem->data, 1, size, file);
		fclose(file);
		mem->data[mem->size-1] = '\0';
		return mem;
	}

	return NULL;
}

static const bgfx::Memory* loadShader(const char* _name, const char* _default = NULL)
{
	char filePath[512];
	shaderFilePath(filePath, _name);
	BX_UNUSED(_default);
	return load(filePath);
}

// Triangulation tables taken from:
// http://paulbourke.net/geometry/polygonise/

static const uint16_t s_edges[256] =
{
	0x000, 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c,
	0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
	0x190, 0x099, 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c,
	0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
	0x230, 0x339, 0x033, 0x13a, 0x636, 0x73f, 0x435, 0x53c,
	0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
	0x3a0, 0x2a9, 0x1a3, 0x0aa, 0x7a6, 0x6af, 0x5a5, 0x4ac,
	0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
	0x460, 0x569, 0x663, 0x76a, 0x66 , 0x16f, 0x265, 0x36c,
	0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
	0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0x0ff, 0x3f5, 0x2fc,
	0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
	0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x055, 0x15c,
	0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
	0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0x0cc,
	0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
	0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc,
	0x0cc, 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
	0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c,
	0x15c, 0x55 , 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
	0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc,
	0x2fc, 0x3f5, 0x0ff, 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
	0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c,
	0x36c, 0x265, 0x16f, 0x066, 0x76a, 0x663, 0x569, 0x460,
	0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac,
	0x4ac, 0x5a5, 0x6af, 0x7a6, 0x0aa, 0x1a3, 0x2a9, 0x3a0,
	0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c,
	0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x033, 0x339, 0x230,
	0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c,
	0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x099, 0x190,
	0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c,
	0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x000,
};

static const int8_t s_indices[256][16] =
{
	{  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  1,  9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  8,  3,  9,  8,  1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  3,  1,  2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  2, 10,  0,  2,  9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  8,  3,  2, 10,  8, 10,  9,  8, -1, -1, -1, -1, -1, -1, -1 },
	{   3, 11,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0, 11,  2,  8, 11,  0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  9,  0,  2,  3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1, 11,  2,  1,  9, 11,  9,  8, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   3, 10,  1, 11, 10,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0, 10,  1,  0,  8, 10,  8, 11, 10, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  9,  0,  3, 11,  9, 11, 10,  9, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  8, 10, 10,  8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  7,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  3,  0,  7,  3,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  1,  9,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  1,  9,  4,  7,  1,  7,  3,  1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 10,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  4,  7,  3,  0,  4,  1,  2, 10, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  2, 10,  9,  0,  2,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1 },
	{   2, 10,  9,  2,  9,  7,  2,  7,  3,  7,  9,  4, -1, -1, -1, -1 },
	{   8,  4,  7,  3, 11,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  11,  4,  7, 11,  2,  4,  2,  0,  4, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  0,  1,  8,  4,  7,  2,  3, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  7, 11,  9,  4, 11,  9, 11,  2,  9,  2,  1, -1, -1, -1, -1 },
	{   3, 10,  1,  3, 11, 10,  7,  8,  4, -1, -1, -1, -1, -1, -1, -1 },
	{   1, 11, 10,  1,  4, 11,  1,  0,  4,  7, 11,  4, -1, -1, -1, -1 },
	{   4,  7,  8,  9,  0, 11,  9, 11, 10, 11,  0,  3, -1, -1, -1, -1 },
	{   4,  7, 11,  4, 11,  9,  9, 11, 10, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  5,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  5,  4,  0,  8,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  5,  4,  1,  5,  0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  5,  4,  8,  3,  5,  3,  1,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 10,  9,  5,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  0,  8,  1,  2, 10,  4,  9,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   5,  2, 10,  5,  4,  2,  4,  0,  2, -1, -1, -1, -1, -1, -1, -1 },
	{   2, 10,  5,  3,  2,  5,  3,  5,  4,  3,  4,  8, -1, -1, -1, -1 },
	{   9,  5,  4,  2,  3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0, 11,  2,  0,  8, 11,  4,  9,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  5,  4,  0,  1,  5,  2,  3, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  1,  5,  2,  5,  8,  2,  8, 11,  4,  8,  5, -1, -1, -1, -1 },
	{  10,  3, 11, 10,  1,  3,  9,  5,  4, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  9,  5,  0,  8,  1,  8, 10,  1,  8, 11, 10, -1, -1, -1, -1 },
	{   5,  4,  0,  5,  0, 11,  5, 11, 10, 11,  0,  3, -1, -1, -1, -1 },
	{   5,  4,  8,  5,  8, 10, 10,  8, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  7,  8,  5,  7,  9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  3,  0,  9,  5,  3,  5,  7,  3, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  7,  8,  0,  1,  7,  1,  5,  7, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  5,  3,  3,  5,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  7,  8,  9,  5,  7, 10,  1,  2, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  1,  2,  9,  5,  0,  5,  3,  0,  5,  7,  3, -1, -1, -1, -1 },
	{   8,  0,  2,  8,  2,  5,  8,  5,  7, 10,  5,  2, -1, -1, -1, -1 },
	{   2, 10,  5,  2,  5,  3,  3,  5,  7, -1, -1, -1, -1, -1, -1, -1 },
	{   7,  9,  5,  7,  8,  9,  3, 11,  2, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  5,  7,  9,  7,  2,  9,  2,  0,  2,  7, 11, -1, -1, -1, -1 },
	{   2,  3, 11,  0,  1,  8,  1,  7,  8,  1,  5,  7, -1, -1, -1, -1 },
	{  11,  2,  1, 11,  1,  7,  7,  1,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  5,  8,  8,  5,  7, 10,  1,  3, 10,  3, 11, -1, -1, -1, -1 },
	{   5,  7,  0,  5,  0,  9,  7, 11,  0,  1,  0, 10, 11, 10,  0, -1 },
	{  11, 10,  0, 11,  0,  3, 10,  5,  0,  8,  0,  7,  5,  7,  0, -1 },
	{  11, 10,  5,  7, 11,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  6,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  3,  5, 10,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  0,  1,  5, 10,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  8,  3,  1,  9,  8,  5, 10,  6, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  6,  5,  2,  6,  1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  6,  5,  1,  2,  6,  3,  0,  8, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  6,  5,  9,  0,  6,  0,  2,  6, -1, -1, -1, -1, -1, -1, -1 },
	{   5,  9,  8,  5,  8,  2,  5,  2,  6,  3,  2,  8, -1, -1, -1, -1 },
	{   2,  3, 11, 10,  6,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  11,  0,  8, 11,  2,  0, 10,  6,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  1,  9,  2,  3, 11,  5, 10,  6, -1, -1, -1, -1, -1, -1, -1 },
	{   5, 10,  6,  1,  9,  2,  9, 11,  2,  9,  8, 11, -1, -1, -1, -1 },
	{   6,  3, 11,  6,  5,  3,  5,  1,  3, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8, 11,  0, 11,  5,  0,  5,  1,  5, 11,  6, -1, -1, -1, -1 },
	{   3, 11,  6,  0,  3,  6,  0,  6,  5,  0,  5,  9, -1, -1, -1, -1 },
	{   6,  5,  9,  6,  9, 11, 11,  9,  8, -1, -1, -1, -1, -1, -1, -1 },
	{   5, 10,  6,  4,  7,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  3,  0,  4,  7,  3,  6,  5, 10, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  9,  0,  5, 10,  6,  8,  4,  7, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  6,  5,  1,  9,  7,  1,  7,  3,  7,  9,  4, -1, -1, -1, -1 },
	{   6,  1,  2,  6,  5,  1,  4,  7,  8, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2,  5,  5,  2,  6,  3,  0,  4,  3,  4,  7, -1, -1, -1, -1 },
	{   8,  4,  7,  9,  0,  5,  0,  6,  5,  0,  2,  6, -1, -1, -1, -1 },
	{   7,  3,  9,  7,  9,  4,  3,  2,  9,  5,  9,  6,  2,  6,  9, -1 },
	{   3, 11,  2,  7,  8,  4, 10,  6,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   5, 10,  6,  4,  7,  2,  4,  2,  0,  2,  7, 11, -1, -1, -1, -1 },
	{   0,  1,  9,  4,  7,  8,  2,  3, 11,  5, 10,  6, -1, -1, -1, -1 },
	{   9,  2,  1,  9, 11,  2,  9,  4, 11,  7, 11,  4,  5, 10,  6, -1 },
	{   8,  4,  7,  3, 11,  5,  3,  5,  1,  5, 11,  6, -1, -1, -1, -1 },
	{   5,  1, 11,  5, 11,  6,  1,  0, 11,  7, 11,  4,  0,  4, 11, -1 },
	{   0,  5,  9,  0,  6,  5,  0,  3,  6, 11,  6,  3,  8,  4,  7, -1 },
	{   6,  5,  9,  6,  9, 11,  4,  7,  9,  7, 11,  9, -1, -1, -1, -1 },
	{  10,  4,  9,  6,  4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4, 10,  6,  4,  9, 10,  0,  8,  3, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  0,  1, 10,  6,  0,  6,  4,  0, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  3,  1,  8,  1,  6,  8,  6,  4,  6,  1, 10, -1, -1, -1, -1 },
	{   1,  4,  9,  1,  2,  4,  2,  6,  4, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  0,  8,  1,  2,  9,  2,  4,  9,  2,  6,  4, -1, -1, -1, -1 },
	{   0,  2,  4,  4,  2,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  3,  2,  8,  2,  4,  4,  2,  6, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  4,  9, 10,  6,  4, 11,  2,  3, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  2,  2,  8, 11,  4,  9, 10,  4, 10,  6, -1, -1, -1, -1 },
	{   3, 11,  2,  0,  1,  6,  0,  6,  4,  6,  1, 10, -1, -1, -1, -1 },
	{   6,  4,  1,  6,  1, 10,  4,  8,  1,  2,  1, 11,  8, 11,  1, -1 },
	{   9,  6,  4,  9,  3,  6,  9,  1,  3, 11,  6,  3, -1, -1, -1, -1 },
	{   8, 11,  1,  8,  1,  0, 11,  6,  1,  9,  1,  4,  6,  4,  1, -1 },
	{   3, 11,  6,  3,  6,  0,  0,  6,  4, -1, -1, -1, -1, -1, -1, -1 },
	{   6,  4,  8, 11,  6,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   7, 10,  6,  7,  8, 10,  8,  9, 10, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  7,  3,  0, 10,  7,  0,  9, 10,  6,  7, 10, -1, -1, -1, -1 },
	{  10,  6,  7,  1, 10,  7,  1,  7,  8,  1,  8,  0, -1, -1, -1, -1 },
	{  10,  6,  7, 10,  7,  1,  1,  7,  3, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2,  6,  1,  6,  8,  1,  8,  9,  8,  6,  7, -1, -1, -1, -1 },
	{   2,  6,  9,  2,  9,  1,  6,  7,  9,  0,  9,  3,  7,  3,  9, -1 },
	{   7,  8,  0,  7,  0,  6,  6,  0,  2, -1, -1, -1, -1, -1, -1, -1 },
	{   7,  3,  2,  6,  7,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  3, 11, 10,  6,  8, 10,  8,  9,  8,  6,  7, -1, -1, -1, -1 },
	{   2,  0,  7,  2,  7, 11,  0,  9,  7,  6,  7, 10,  9, 10,  7, -1 },
	{   1,  8,  0,  1,  7,  8,  1, 10,  7,  6,  7, 10,  2,  3, 11, -1 },
	{  11,  2,  1, 11,  1,  7, 10,  6,  1,  6,  7,  1, -1, -1, -1, -1 },
	{   8,  9,  6,  8,  6,  7,  9,  1,  6, 11,  6,  3,  1,  3,  6, -1 },
	{   0,  9,  1, 11,  6,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   7,  8,  0,  7,  0,  6,  3, 11,  0, 11,  6,  0, -1, -1, -1, -1 },
	{   7, 11,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   7,  6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  0,  8, 11,  7,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  1,  9, 11,  7,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  1,  9,  8,  3,  1, 11,  7,  6, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  1,  2,  6, 11,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 10,  3,  0,  8,  6, 11,  7, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  9,  0,  2, 10,  9,  6, 11,  7, -1, -1, -1, -1, -1, -1, -1 },
	{   6, 11,  7,  2, 10,  3, 10,  8,  3, 10,  9,  8, -1, -1, -1, -1 },
	{   7,  2,  3,  6,  2,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   7,  0,  8,  7,  6,  0,  6,  2,  0, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  7,  6,  2,  3,  7,  0,  1,  9, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  6,  2,  1,  8,  6,  1,  9,  8,  8,  7,  6, -1, -1, -1, -1 },
	{  10,  7,  6, 10,  1,  7,  1,  3,  7, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  7,  6,  1,  7, 10,  1,  8,  7,  1,  0,  8, -1, -1, -1, -1 },
	{   0,  3,  7,  0,  7, 10,  0, 10,  9,  6, 10,  7, -1, -1, -1, -1 },
	{   7,  6, 10,  7, 10,  8,  8, 10,  9, -1, -1, -1, -1, -1, -1, -1 },
	{   6,  8,  4, 11,  8,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  6, 11,  3,  0,  6,  0,  4,  6, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  6, 11,  8,  4,  6,  9,  0,  1, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  4,  6,  9,  6,  3,  9,  3,  1, 11,  3,  6, -1, -1, -1, -1 },
	{   6,  8,  4,  6, 11,  8,  2, 10,  1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 10,  3,  0, 11,  0,  6, 11,  0,  4,  6, -1, -1, -1, -1 },
	{   4, 11,  8,  4,  6, 11,  0,  2,  9,  2, 10,  9, -1, -1, -1, -1 },
	{  10,  9,  3, 10,  3,  2,  9,  4,  3, 11,  3,  6,  4,  6,  3, -1 },
	{   8,  2,  3,  8,  4,  2,  4,  6,  2, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  4,  2,  4,  6,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  9,  0,  2,  3,  4,  2,  4,  6,  4,  3,  8, -1, -1, -1, -1 },
	{   1,  9,  4,  1,  4,  2,  2,  4,  6, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  1,  3,  8,  6,  1,  8,  4,  6,  6, 10,  1, -1, -1, -1, -1 },
	{  10,  1,  0, 10,  0,  6,  6,  0,  4, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  6,  3,  4,  3,  8,  6, 10,  3,  0,  3,  9, 10,  9,  3, -1 },
	{  10,  9,  4,  6, 10,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  9,  5,  7,  6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  3,  4,  9,  5, 11,  7,  6, -1, -1, -1, -1, -1, -1, -1 },
	{   5,  0,  1,  5,  4,  0,  7,  6, 11, -1, -1, -1, -1, -1, -1, -1 },
	{  11,  7,  6,  8,  3,  4,  3,  5,  4,  3,  1,  5, -1, -1, -1, -1 },
	{   9,  5,  4, 10,  1,  2,  7,  6, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   6, 11,  7,  1,  2, 10,  0,  8,  3,  4,  9,  5, -1, -1, -1, -1 },
	{   7,  6, 11,  5,  4, 10,  4,  2, 10,  4,  0,  2, -1, -1, -1, -1 },
	{   3,  4,  8,  3,  5,  4,  3,  2,  5, 10,  5,  2, 11,  7,  6, -1 },
	{   7,  2,  3,  7,  6,  2,  5,  4,  9, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  5,  4,  0,  8,  6,  0,  6,  2,  6,  8,  7, -1, -1, -1, -1 },
	{   3,  6,  2,  3,  7,  6,  1,  5,  0,  5,  4,  0, -1, -1, -1, -1 },
	{   6,  2,  8,  6,  8,  7,  2,  1,  8,  4,  8,  5,  1,  5,  8, -1 },
	{   9,  5,  4, 10,  1,  6,  1,  7,  6,  1,  3,  7, -1, -1, -1, -1 },
	{   1,  6, 10,  1,  7,  6,  1,  0,  7,  8,  7,  0,  9,  5,  4, -1 },
	{   4,  0, 10,  4, 10,  5,  0,  3, 10,  6, 10,  7,  3,  7, 10, -1 },
	{   7,  6, 10,  7, 10,  8,  5,  4, 10,  4,  8, 10, -1, -1, -1, -1 },
	{   6,  9,  5,  6, 11,  9, 11,  8,  9, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  6, 11,  0,  6,  3,  0,  5,  6,  0,  9,  5, -1, -1, -1, -1 },
	{   0, 11,  8,  0,  5, 11,  0,  1,  5,  5,  6, 11, -1, -1, -1, -1 },
	{   6, 11,  3,  6,  3,  5,  5,  3,  1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 10,  9,  5, 11,  9, 11,  8, 11,  5,  6, -1, -1, -1, -1 },
	{   0, 11,  3,  0,  6, 11,  0,  9,  6,  5,  6,  9,  1,  2, 10, -1 },
	{  11,  8,  5, 11,  5,  6,  8,  0,  5, 10,  5,  2,  0,  2,  5, -1 },
	{   6, 11,  3,  6,  3,  5,  2, 10,  3, 10,  5,  3, -1, -1, -1, -1 },
	{   5,  8,  9,  5,  2,  8,  5,  6,  2,  3,  8,  2, -1, -1, -1, -1 },
	{   9,  5,  6,  9,  6,  0,  0,  6,  2, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  5,  8,  1,  8,  0,  5,  6,  8,  3,  8,  2,  6,  2,  8, -1 },
	{   1,  5,  6,  2,  1,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  3,  6,  1,  6, 10,  3,  8,  6,  5,  6,  9,  8,  9,  6, -1 },
	{  10,  1,  0, 10,  0,  6,  9,  5,  0,  5,  6,  0, -1, -1, -1, -1 },
	{   0,  3,  8,  5,  6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  5,  6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  11,  5, 10,  7,  5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  11,  5, 10, 11,  7,  5,  8,  3,  0, -1, -1, -1, -1, -1, -1, -1 },
	{   5, 11,  7,  5, 10, 11,  1,  9,  0, -1, -1, -1, -1, -1, -1, -1 },
	{  10,  7,  5, 10, 11,  7,  9,  8,  1,  8,  3,  1, -1, -1, -1, -1 },
	{  11,  1,  2, 11,  7,  1,  7,  5,  1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  3,  1,  2,  7,  1,  7,  5,  7,  2, 11, -1, -1, -1, -1 },
	{   9,  7,  5,  9,  2,  7,  9,  0,  2,  2, 11,  7, -1, -1, -1, -1 },
	{   7,  5,  2,  7,  2, 11,  5,  9,  2,  3,  2,  8,  9,  8,  2, -1 },
	{   2,  5, 10,  2,  3,  5,  3,  7,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  2,  0,  8,  5,  2,  8,  7,  5, 10,  2,  5, -1, -1, -1, -1 },
	{   9,  0,  1,  5, 10,  3,  5,  3,  7,  3, 10,  2, -1, -1, -1, -1 },
	{   9,  8,  2,  9,  2,  1,  8,  7,  2, 10,  2,  5,  7,  5,  2, -1 },
	{   1,  3,  5,  3,  7,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  7,  0,  7,  1,  1,  7,  5, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  0,  3,  9,  3,  5,  5,  3,  7, -1, -1, -1, -1, -1, -1, -1 },
	{   9,  8,  7,  5,  9,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   5,  8,  4,  5, 10,  8, 10, 11,  8, -1, -1, -1, -1, -1, -1, -1 },
	{   5,  0,  4,  5, 11,  0,  5, 10, 11, 11,  3,  0, -1, -1, -1, -1 },
	{   0,  1,  9,  8,  4, 10,  8, 10, 11, 10,  4,  5, -1, -1, -1, -1 },
	{  10, 11,  4, 10,  4,  5, 11,  3,  4,  9,  4,  1,  3,  1,  4, -1 },
	{   2,  5,  1,  2,  8,  5,  2, 11,  8,  4,  5,  8, -1, -1, -1, -1 },
	{   0,  4, 11,  0, 11,  3,  4,  5, 11,  2, 11,  1,  5,  1, 11, -1 },
	{   0,  2,  5,  0,  5,  9,  2, 11,  5,  4,  5,  8, 11,  8,  5, -1 },
	{   9,  4,  5,  2, 11,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  5, 10,  3,  5,  2,  3,  4,  5,  3,  8,  4, -1, -1, -1, -1 },
	{   5, 10,  2,  5,  2,  4,  4,  2,  0, -1, -1, -1, -1, -1, -1, -1 },
	{   3, 10,  2,  3,  5, 10,  3,  8,  5,  4,  5,  8,  0,  1,  9, -1 },
	{   5, 10,  2,  5,  2,  4,  1,  9,  2,  9,  4,  2, -1, -1, -1, -1 },
	{   8,  4,  5,  8,  5,  3,  3,  5,  1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  4,  5,  1,  0,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   8,  4,  5,  8,  5,  3,  9,  0,  5,  0,  3,  5, -1, -1, -1, -1 },
	{   9,  4,  5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4, 11,  7,  4,  9, 11,  9, 10, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  8,  3,  4,  9,  7,  9, 11,  7,  9, 10, 11, -1, -1, -1, -1 },
	{   1, 10, 11,  1, 11,  4,  1,  4,  0,  7,  4, 11, -1, -1, -1, -1 },
	{   3,  1,  4,  3,  4,  8,  1, 10,  4,  7,  4, 11, 10, 11,  4, -1 },
	{   4, 11,  7,  9, 11,  4,  9,  2, 11,  9,  1,  2, -1, -1, -1, -1 },
	{   9,  7,  4,  9, 11,  7,  9,  1, 11,  2, 11,  1,  0,  8,  3, -1 },
	{  11,  7,  4, 11,  4,  2,  2,  4,  0, -1, -1, -1, -1, -1, -1, -1 },
	{  11,  7,  4, 11,  4,  2,  8,  3,  4,  3,  2,  4, -1, -1, -1, -1 },
	{   2,  9, 10,  2,  7,  9,  2,  3,  7,  7,  4,  9, -1, -1, -1, -1 },
	{   9, 10,  7,  9,  7,  4, 10,  2,  7,  8,  7,  0,  2,  0,  7, -1 },
	{   3,  7, 10,  3, 10,  2,  7,  4, 10,  1, 10,  0,  4,  0, 10, -1 },
	{   1, 10,  2,  8,  7,  4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  9,  1,  4,  1,  7,  7,  1,  3, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  9,  1,  4,  1,  7,  0,  8,  1,  8,  7,  1, -1, -1, -1, -1 },
	{   4,  0,  3,  7,  4,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   4,  8,  7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   9, 10,  8, 10, 11,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  0,  9,  3,  9, 11, 11,  9, 10, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  1, 10,  0, 10,  8,  8, 10, 11, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  1, 10, 11,  3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  2, 11,  1, 11,  9,  9, 11,  8, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  0,  9,  3,  9, 11,  1,  2,  9,  2, 11,  9, -1, -1, -1, -1 },
	{   0,  2, 11,  8,  0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   3,  2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  3,  8,  2,  8, 10, 10,  8,  9, -1, -1, -1, -1, -1, -1, -1 },
	{   9, 10,  2,  0,  9,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   2,  3,  8,  2,  8, 10,  0,  1,  8,  1, 10,  8, -1, -1, -1, -1 },
	{   1, 10,  2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   1,  3,  8,  9,  1,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  9,  1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{   0,  3,  8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
	{  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
};

static const float s_cube[8][3] =
{
	{ 0.0f, 1.0f, 1.0f }, // 0
	{ 1.0f, 1.0f, 1.0f }, // 1
	{ 1.0f, 1.0f, 0.0f }, // 2
	{ 0.0f, 1.0f, 0.0f }, // 3
	{ 0.0f, 0.0f, 1.0f }, // 4
	{ 1.0f, 0.0f, 1.0f }, // 5
	{ 1.0f, 0.0f, 0.0f }, // 6
	{ 0.0f, 0.0f, 0.0f }, // 7
};

float vertLerp(float* __restrict _result, float _iso, uint32_t _idx0, float _v0, uint32_t _idx1, float _v1)
{
	const float* __restrict edge0 = s_cube[_idx0];
	const float* __restrict edge1 = s_cube[_idx1];

	if (fabsf(_iso-_v1) < 0.00001f)
	{
		_result[0] = edge1[0];
		_result[1] = edge1[1];
		_result[2] = edge1[2];
		return 1.0f;
	}

	if (fabsf(_iso-_v0) < 0.00001f
	||  fabsf(_v0-_v1) < 0.00001f)
	{
		_result[0] = edge0[0];
		_result[1] = edge0[1];
		_result[2] = edge0[2];
		return 0.0f;
	}

	float lerp = (_iso - _v0) / (_v1 - _v0);
	_result[0] = edge0[0] + lerp * (edge1[0] - edge0[0]);
	_result[1] = edge0[1] + lerp * (edge1[1] - edge0[1]);
	_result[2] = edge0[2] + lerp * (edge1[2] - edge0[2]);

	return lerp;
}

uint32_t triangulate(uint8_t* _result, uint32_t _stride, const float* __restrict _rgb, const float* __restrict _xyz, const Grid* _val[8], float _iso)
{
	uint8_t cubeindex = 0;
	cubeindex |= (_val[0]->m_val < _iso) ? 0x01 : 0;
	cubeindex |= (_val[1]->m_val < _iso) ? 0x02 : 0;
	cubeindex |= (_val[2]->m_val < _iso) ? 0x04 : 0;
	cubeindex |= (_val[3]->m_val < _iso) ? 0x08 : 0;
	cubeindex |= (_val[4]->m_val < _iso) ? 0x10 : 0;
	cubeindex |= (_val[5]->m_val < _iso) ? 0x20 : 0;
	cubeindex |= (_val[6]->m_val < _iso) ? 0x40 : 0;
	cubeindex |= (_val[7]->m_val < _iso) ? 0x80 : 0;

	if (0 == s_edges[cubeindex])
	{
		return 0;
	}

	float verts[12][6];
	uint16_t flags = s_edges[cubeindex];

	for (uint32_t ii = 0; ii < 12; ++ii)
	{
		if (flags & (1<<ii) )
		{
			uint32_t idx0 = ii&7;
			uint32_t idx1 = "\x1\x2\x3\x0\x5\x6\x7\x4\x4\x5\x6\x7"[ii];
			float* vertex = verts[ii];
			float lerp = vertLerp(vertex, _iso, idx0, _val[idx0]->m_val, idx1, _val[idx1]->m_val);

			const float* na = _val[idx0]->m_normal;
			const float* nb = _val[idx1]->m_normal;
			vertex[3] = na[0] + lerp * (nb[0] - na[0]);
			vertex[4] = na[1] + lerp * (nb[1] - na[1]);
			vertex[5] = na[2] + lerp * (nb[2] - na[2]);
		}
	}

	float dr = _rgb[3] - _rgb[0];
	float dg = _rgb[4] - _rgb[1];
	float db = _rgb[5] - _rgb[2];

	uint32_t num = 0;
	const int8_t* indices = s_indices[cubeindex];
	for (uint32_t ii = 0; indices[ii] != -1; ++ii)
	{
		const float* vertex = verts[indices[ii] ];

		float* xyz = (float*)_result;
		xyz[0] = _xyz[0] + vertex[0];
		xyz[1] = _xyz[1] + vertex[1];
		xyz[2] = _xyz[2] + vertex[2];

		xyz[3] = vertex[3];
		xyz[4] = vertex[4];
		xyz[5] = vertex[5];

		uint32_t rr = uint8_t( (_rgb[0] + vertex[0]*dr)*255.0f);
		uint32_t gg = uint8_t( (_rgb[1] + vertex[1]*dg)*255.0f);
		uint32_t bb = uint8_t( (_rgb[2] + vertex[2]*db)*255.0f);

		uint32_t* abgr = (uint32_t*)&_result[24];
		*abgr = 0xff000000
			  | (bb<<16)
			  | (gg<<8)
			  | rr
			  ;

		_result += _stride;
		++num;
	}

	return num;
}

int _main_(int _argc, char** _argv)
{
	bgfx::init(BX_PLATFORM_WINDOWS, fatalCb);
	bgfx::reset(1280, 720);

	// Enable debug text.
	bgfx::setDebug(BGFX_DEBUG_TEXT);

	// Set view 0 default viewport.
	bgfx::setViewRect(0, 0, 0, 1280, 720);

	// Set view 0 clear state.
	bgfx::setViewClear(0
		, BGFX_CLEAR_COLOR_BIT|BGFX_CLEAR_DEPTH_BIT
		, 0x303030ff
		, 1.0f
		, 0
		);

	// Setup root path for binary shaders. Shader binaries are different 
	// for each renderer.
	switch (bgfx::getRendererType() )
	{
	case bgfx::RendererType::Null:
	case bgfx::RendererType::Direct3D9:
		s_shaderPath = "shaders/dx9/";
		break;

	case bgfx::RendererType::Direct3D11:
		s_shaderPath = "shaders/dx11/";
		break;

	case bgfx::RendererType::OpenGL:
		s_shaderPath = "shaders/glsl/";
		break;

	case bgfx::RendererType::OpenGLES2:
		s_shaderPath = "shaders/gles/";
		break;
	}

	// Create vertex stream declaration.
	s_PosNormalColorDecl.begin();
	s_PosNormalColorDecl.add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float);
	s_PosNormalColorDecl.add(bgfx::Attrib::Normal, 3, bgfx::AttribType::Float);
	s_PosNormalColorDecl.add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true);
	s_PosNormalColorDecl.end();

	const bgfx::Memory* mem;

	// Load vertex shader.
	mem = loadShader("vs_metaballs");
	bgfx::VertexShaderHandle vsh = bgfx::createVertexShader(mem);

	// Load fragment shader.
	mem = loadShader("fs_metaballs");
	bgfx::FragmentShaderHandle fsh = bgfx::createFragmentShader(mem);

	// Create program from shaders.
	bgfx::ProgramHandle program = bgfx::createProgram(vsh, fsh);

	// We can destroy vertex and fragment shader here since
	// their reference is kept inside bgfx after calling createProgram.
	// Vertex and fragment shader will be destroyed once program is
	// destroyed.
	bgfx::destroyVertexShader(vsh);
	bgfx::destroyFragmentShader(fsh);

#define DIMS 32

	Grid* grid = new Grid[DIMS*DIMS*DIMS];
	const uint32_t ypitch = DIMS;
	const uint32_t zpitch = DIMS*DIMS;
	const float invdim = 1.0f/float(DIMS-1);

	while (true)
	{
		// This dummy draw call is here to make sure that view 0 is cleared
		// if not other draw calls are submitted to view 0.
		bgfx::submit(0);

		int64_t now = bx::getHPCounter();
		static int64_t last = now;
		const int64_t frameTime = now - last;
		last = now;
		const double freq = double(bx::getHPFrequency() );
		const double toMs = 1000.0/freq;

		// Use debug font to print information about this example.
		bgfx::dbgTextClear();
		bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/02-metaball");
		bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Rendering with transient buffers.");

		float at[3] = { 0.0f, 0.0f, 0.0f };
		float eye[3] = { 0.0f, 0.0f, -50.0f };
		
		float view[16];
		float proj[16];
		mtxLookAt(view, eye, at);
		mtxProj(proj, 60.0f, 16.0f/9.0f, 0.1f, 100.0f);

		// Set view and projection matrix for view 0.
		bgfx::setViewTransform(0, view, proj);

		float time = (float)(bx::getHPCounter()/double(bx::getHPFrequency() ) );

		// Stats.
		uint32_t numVertices = 0;
		int64_t profUpdate = 0;
		int64_t profNormal = 0;
		int64_t profTriangulate = 0;

		// Allocate 32K vertices in transient vertex buffer.
		uint32_t maxVertices = (32<<10);
		const bgfx::TransientVertexBuffer* tvb = bgfx::allocTransientVertexBuffer(maxVertices, s_PosNormalColorDecl);

		// If there is no enough space in transient vertex buffer alloc will return NULL.
		if (NULL != tvb)
		{
			const uint32_t numSpheres = 16;
			float sphere[numSpheres][4];
			for (uint32_t ii = 0; ii < numSpheres; ++ii)
			{
				sphere[ii][0] = sin(time*(ii*0.21f)+ii*0.37f) * (DIMS * 0.5f - 8.0f);
				sphere[ii][1] = sin(time*(ii*0.37f)+ii*0.67f) * (DIMS * 0.5f - 8.0f);
				sphere[ii][2] = cos(time*(ii*0.11f)+ii*0.13f) * (DIMS * 0.5f - 8.0f);
				sphere[ii][3] = 1.0f/(2.0f + (sin(time*(ii*0.13f) )*0.5f+0.5f)*2.0f);
			}

			profUpdate = bx::getHPCounter();
			
			for (uint32_t zz = 0; zz < DIMS; ++zz)
			{
				for (uint32_t yy = 0; yy < DIMS; ++yy)
				{
					uint32_t offset = (zz*DIMS+yy)*DIMS;

					for (uint32_t xx = 0; xx < DIMS; ++xx)
					{
						uint32_t xoffset = offset + xx;

						float dist = 0.0f;
						float prod = 1.0f;
						for (uint32_t ii = 0; ii < numSpheres; ++ii)
						{
							const float* pos = sphere[ii];
							float dx = pos[0] - (-DIMS*0.5f + float(xx) );
							float dy = pos[1] - (-DIMS*0.5f + float(yy) );
							float dz = pos[2] - (-DIMS*0.5f + float(zz) );
							float invr = pos[3];
							float dot = dx*dx + dy*dy + dz*dz;
							dot *= invr*invr;

							dist *= dot;
							dist += prod;
							prod *= dot;
						}

						grid[xoffset].m_val = dist / prod - 1.0f;
					}
				}
			}

			profUpdate = bx::getHPCounter() - profUpdate;

			profNormal = bx::getHPCounter();

			for (uint32_t zz = 1; zz < DIMS-1; ++zz)
			{
				for (uint32_t yy = 1; yy < DIMS-1; ++yy)
				{
					uint32_t offset = (zz*DIMS+yy)*DIMS;

					for (uint32_t xx = 1; xx < DIMS-1; ++xx)
					{
						uint32_t xoffset = offset + xx;

						float normal[3] =
						{
							grid[xoffset-1     ].m_val - grid[xoffset+1     ].m_val,
							grid[xoffset-ypitch].m_val - grid[xoffset+ypitch].m_val,
							grid[xoffset-zpitch].m_val - grid[xoffset+zpitch].m_val,
						};

						vec3Norm(grid[xoffset].m_normal, normal);
					}
				}
			}

			profNormal = bx::getHPCounter() - profNormal;

			profTriangulate = bx::getHPCounter();

			PosNormalColorVertex* vertex = (PosNormalColorVertex*)tvb->data;

			for (uint32_t zz = 0; zz < DIMS-1 && numVertices+12 < maxVertices; ++zz)
			{
				float rgb[6];
				rgb[2] = zz*invdim;
				rgb[5] = (zz+1)*invdim;

				for (uint32_t yy = 0; yy < DIMS-1 && numVertices+12 < maxVertices; ++yy)
				{
					uint32_t offset = (zz*DIMS+yy)*DIMS;

					rgb[1] = yy*invdim;
					rgb[4] = (yy+1)*invdim;

					for (uint32_t xx = 0; xx < DIMS-1 && numVertices+12 < maxVertices; ++xx)
					{
						uint32_t xoffset = offset + xx;

						rgb[0] = xx*invdim;
						rgb[3] = (xx+1)*invdim;

						float pos[3] =
						{
							-DIMS*0.5f + float(xx),
							-DIMS*0.5f + float(yy),
							-DIMS*0.5f + float(zz)
						};

						const Grid* val[8] = { 
							&grid[xoffset+zpitch+ypitch  ],
							&grid[xoffset+zpitch+ypitch+1],
							&grid[xoffset+ypitch+1       ],
							&grid[xoffset+ypitch         ],
							&grid[xoffset+zpitch         ],
							&grid[xoffset+zpitch+1       ],
							&grid[xoffset+1              ],
							&grid[xoffset                ],
						};

						uint32_t num = triangulate( (uint8_t*)vertex, s_PosNormalColorDecl.m_stride, rgb, pos, val, 0.5f);
						vertex += num;
						numVertices += num;
					}
				}
			}

			profTriangulate = bx::getHPCounter() - profTriangulate;

			float mtx[16];
			mtxRotateXY(mtx, time*0.67f, time);

			// Set model matrix for rendering.
			bgfx::setTransform(mtx);

			// Set vertex and fragment shaders.
			bgfx::setProgram(program);

			// Set vertex and index buffer.
			bgfx::setVertexBuffer(tvb, numVertices);

			// Set render states.
			bgfx::setState(BGFX_STATE_RGB_WRITE
				|BGFX_STATE_DEPTH_WRITE
				|BGFX_STATE_DEPTH_TEST_LESS
				);

			// Submit primitive for rendering to view 0.
			bgfx::submit(0);
		}

		// Display stats.
		bgfx::dbgTextPrintf(1, 4, 0x0f, "Num vertices: %5d (%6.4f%%)", numVertices, float(numVertices)/maxVertices * 100);
		bgfx::dbgTextPrintf(1, 5, 0x0f, "      Update: % 7.3f[ms]", double(profUpdate)*toMs);
		bgfx::dbgTextPrintf(1, 6, 0x0f, "Calc normals: % 7.3f[ms]", double(profNormal)*toMs);
		bgfx::dbgTextPrintf(1, 7, 0x0f, " Triangulate: % 7.3f[ms]", double(profTriangulate)*toMs);
		bgfx::dbgTextPrintf(1, 8, 0x0f, "       Frame: % 7.3f[ms]", double(frameTime)*toMs);

		// Advance to next frame. Rendering thread will be kicked to 
		// process submitted rendering primitives.
		bgfx::frame();
	}

	delete [] grid;

	// Cleanup.
	bgfx::destroyProgram(program);

	// Shutdown bgfx.
	bgfx::shutdown();

	return 0;
}