/*
** v_palette.cpp
** Automatic colormap generation for "colored lights", etc.
**
**---------------------------------------------------------------------------
** Copyright 1998-2006 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/

#include "g_level.h"

#ifdef _WIN32
#include <io.h>
#else
#define O_BINARY 0
#endif

#include "templates.h"
#include "v_video.h"
#include "filesystem.h"
#include "i_video.h"
#include "c_dispatch.h"
#include "st_stuff.h"
#include "x86.h"
#include "g_levellocals.h"
#include "m_png.h"

/* Current color blending values */
int		BlendR, BlendG, BlendB, BlendA;

/**************************/
/* Gamma correction stuff */
/**************************/

uint8_t newgamma[256];
CUSTOM_CVAR (Float, Gamma, 1.f, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
{
	if (self == 0.f)
	{ // Gamma values of 0 are illegal.
		self = 1.f;
		return;
	}

	if (screen != NULL)
	{
		screen->SetGamma ();
	}
}

CCMD (bumpgamma)
{
	// [RH] Gamma correction tables are now generated on the fly for *any* gamma level
	// Q: What are reasonable limits to use here?

	float newgamma = Gamma + 0.1f;

	if (newgamma > 3.0)
		newgamma = 1.0;

	Gamma = newgamma;
	Printf ("Gamma correction level %g\n", *Gamma);
}



void InitPalette ()
{
	uint8_t pal[768];
	
	ReadPalette(fileSystem.GetNumForName("PLAYPAL"), pal);

	GPalette.Init(NUM_TRANSLATION_TABLES);
	GPalette.SetPalette (pal, -1);

	int lump = fileSystem.CheckNumForName("COLORMAP");
	if (lump == -1) lump = fileSystem.CheckNumForName("COLORMAP", ns_colormaps);
	if (lump != -1)
	{
		FileData cmap = fileSystem.ReadFile(lump);
		uint8_t palbuffer[768];
		ReadPalette(fileSystem.GetNumForName("PLAYPAL"), palbuffer);
		const unsigned char* cmapdata = (const unsigned char*)cmap.GetMem();
		GPalette.GenerateGlobalBrightmapFromColormap(cmapdata, 32);
	}

	MakeGoodRemap ((uint32_t*)GPalette.BaseColors, GPalette.Remap);
	ColorMatcher.SetPalette ((uint32_t *)GPalette.BaseColors);

	if (GPalette.Remap[0] == 0)
	{ // No duplicates, so settle for something close to color 0
		GPalette.Remap[0] = BestColor ((uint32_t *)GPalette.BaseColors,
			GPalette.BaseColors[0].r, GPalette.BaseColors[0].g, GPalette.BaseColors[0].b, 1, 255);
	}
	GPalette.BaseColors[0] = 0;

	// Colormaps have to be initialized before actors are loaded,
	// otherwise Powerup.Colormap will not work.
	R_InitColormaps ();
	BuildTransTable (GPalette.BaseColors);

}

CCMD (testblend)
{
	FString colorstring;
	int color;
	float amt;

	if (argv.argc() < 3)
	{
		Printf ("testblend <color> <amount>\n");
	}
	else
	{
		if ( !(colorstring = V_GetColorStringByName (argv[1])).IsEmpty() )
		{
			color = V_GetColorFromString (NULL, colorstring);
		}
		else
		{
			color = V_GetColorFromString (NULL, argv[1]);
		}
		amt = (float)atof (argv[2]);
		if (amt > 1.0f)
			amt = 1.0f;
		else if (amt < 0.0f)
			amt = 0.0f;
		BaseBlendR = RPART(color);
		BaseBlendG = GPART(color);
		BaseBlendB = BPART(color);
		BaseBlendA = amt;
	}
}