/*
Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

// draw.c

#include "gl_local.h"

image_t		*draw_chars;

extern	qboolean	scrap_dirty;
void Scrap_Upload (void);


/*
===============
Draw_InitLocal
===============
*/
void Draw_InitLocal (void)
{
	// load console characters (don't bilerp characters)
	draw_chars = GL_FindImage ("pics/conchars.pcx", it_pic);
	// Knightmare- error out instead of crashing if we can't load this
	if (!draw_chars)
		ri.Sys_Error (ERR_FATAL, "Couldn't load pics/conchars.pcx");
	// end Knightmare
	GL_Bind( draw_chars->texnum );
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}



/*
================
Draw_Char

Draws one 8*8 graphics character with 0 being transparent.
It can be clipped to the top of the screen to allow the console to be
smoothly scrolled off.
================
*/
void Draw_Char (int x, int y, int num)
{
	int				row, col;
	float			frow, fcol, size;

	num &= 255;
	
	if ( (num&127) == 32 )
		return;		// space

	if (y <= -8)
		return;			// totally off screen

	row = num>>4;
	col = num&15;

	frow = row*0.0625;
	fcol = col*0.0625;
	size = 0.0625;

	GL_Bind (draw_chars->texnum);

	qglBegin (GL_QUADS);
	qglTexCoord2f (fcol, frow);
	qglVertex2f (x, y);
	qglTexCoord2f (fcol + size, frow);
	qglVertex2f (x+8, y);
	qglTexCoord2f (fcol + size, frow + size);
	qglVertex2f (x+8, y+8);
	qglTexCoord2f (fcol, frow + size);
	qglVertex2f (x, y+8);
	qglEnd ();
}

/*
=============
Draw_FindPic
=============
*/
image_t	*Draw_FindPic (char *name)
{
	image_t *gl;
	char	fullname[MAX_QPATH];

	if (name[0] != '/' && name[0] != '\\')
	{
		Com_sprintf (fullname, sizeof(fullname), "pics/%s.pcx", name);
		gl = GL_FindImage (fullname, it_pic);
	}
	else
		gl = GL_FindImage (name+1, it_pic);

	return gl;
}

/*
=============
Draw_GetPicSize
=============
*/
void Draw_GetPicSize (int *w, int *h, char *pic)
{
	image_t *gl;

	gl = Draw_FindPic (pic);
	if (!gl)
	{
		*w = *h = -1;
		return;
	}
	*w = gl->width;
	*h = gl->height;
}

/*
=============
Draw_StretchPic
=============
*/
void Draw_StretchPic (int x, int y, int w, int h, char *pic)
{
	image_t *gl;

	gl = Draw_FindPic (pic);
	if (!gl)
	{
		ri.Con_Printf (PRINT_ALL, "Can't find pic: %s\n", pic);
		return;
	}

	if (scrap_dirty)
		Scrap_Upload ();

	// Knightmare added- fix text/console corruption on drop errors
	if (gl_config.multitexture && gl_state.multitextureEnabled)
		GL_EnableMultitexture(false);
	// end Knightmare

	if ( ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) && !gl->has_alpha)
		qglDisable (GL_ALPHA_TEST);

	GL_Bind (gl->texnum);
	qglBegin (GL_QUADS);
	qglTexCoord2f (gl->sl, gl->tl);
	qglVertex2f (x, y);
	qglTexCoord2f (gl->sh, gl->tl);
	qglVertex2f (x+w, y);
	qglTexCoord2f (gl->sh, gl->th);
	qglVertex2f (x+w, y+h);
	qglTexCoord2f (gl->sl, gl->th);
	qglVertex2f (x, y+h);
	qglEnd ();

	if ( ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) && !gl->has_alpha)
		qglEnable (GL_ALPHA_TEST);
}


/*
=============
Draw_Pic
=============
*/
void Draw_Pic (int x, int y, char *pic)
{
	image_t *gl;

	gl = Draw_FindPic (pic);
	if (!gl)
	{
		ri.Con_Printf (PRINT_ALL, "Can't find pic: %s\n", pic);
		return;
	}
	if (scrap_dirty)
		Scrap_Upload ();

	if ( ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) && !gl->has_alpha)
		qglDisable (GL_ALPHA_TEST);

	GL_Bind (gl->texnum);
	qglBegin (GL_QUADS);
	qglTexCoord2f (gl->sl, gl->tl);
	qglVertex2f (x, y);
	qglTexCoord2f (gl->sh, gl->tl);
	qglVertex2f (x+gl->width, y);
	qglTexCoord2f (gl->sh, gl->th);
	qglVertex2f (x+gl->width, y+gl->height);
	qglTexCoord2f (gl->sl, gl->th);
	qglVertex2f (x, y+gl->height);
	qglEnd ();

	if ( ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) )  && !gl->has_alpha)
		qglEnable (GL_ALPHA_TEST);
}

/*
=============
Draw_TileClear

This repeats a 64*64 tile graphic to fill the screen around a sized down
refresh window.
=============
*/
void Draw_TileClear (int x, int y, int w, int h, char *pic)
{
	image_t	*image;

	image = Draw_FindPic (pic);
	if (!image)
	{
		ri.Con_Printf (PRINT_ALL, "Can't find pic: %s\n", pic);
		return;
	}

	if ( ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) )  && !image->has_alpha)
		qglDisable (GL_ALPHA_TEST);

	GL_Bind (image->texnum);
	qglBegin (GL_QUADS);
	qglTexCoord2f (x/64.0, y/64.0);
	qglVertex2f (x, y);
	qglTexCoord2f ( (x+w)/64.0, y/64.0);
	qglVertex2f (x+w, y);
	qglTexCoord2f ( (x+w)/64.0, (y+h)/64.0);
	qglVertex2f (x+w, y+h);
	qglTexCoord2f ( x/64.0, (y+h)/64.0 );
	qglVertex2f (x, y+h);
	qglEnd ();

	if ( ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) )  && !image->has_alpha)
		qglEnable (GL_ALPHA_TEST);
}


/*
=============
Draw_Fill

Fills a box of pixels with a single color
=============
*/
void Draw_Fill (int x, int y, int w, int h, int c)
{
	union
	{
		unsigned	c;
		byte		v[4];
	} color;

	if ( (unsigned)c > 255)
		ri.Sys_Error (ERR_FATAL, "Draw_Fill: bad color");

	qglDisable (GL_TEXTURE_2D);

	color.c = d_8to24table[c];
	qglColor3f (color.v[0]/255.0,
		color.v[1]/255.0,
		color.v[2]/255.0);

	qglBegin (GL_QUADS);

	qglVertex2f (x,y);
	qglVertex2f (x+w, y);
	qglVertex2f (x+w, y+h);
	qglVertex2f (x, y+h);

	qglEnd ();
	qglColor3f (1,1,1);
	qglEnable (GL_TEXTURE_2D);
}

//=============================================================================

/*
================
Draw_FadeScreen

================
*/
void Draw_FadeScreen (void)
{
	qglEnable (GL_BLEND);
	qglDisable (GL_TEXTURE_2D);
	qglColor4f (0, 0, 0, 0.8);
	qglBegin (GL_QUADS);

	qglVertex2f (0,0);
	qglVertex2f (vid.width, 0);
	qglVertex2f (vid.width, vid.height);
	qglVertex2f (0, vid.height);

	qglEnd ();
	qglColor4f (1,1,1,1);
	qglEnable (GL_TEXTURE_2D);
	qglDisable (GL_BLEND);
}


//====================================================================


/*
=============
Draw_StretchRaw

Knightmare: rewrote for
non-power-of-two texture support
=============
*/
extern unsigned	r_rawpalette[256];
#if 1
void Draw_StretchRaw (int x, int y, int w, int h, int cols, int rows, byte *data)
{
	unsigned	*image32 = NULL;
	unsigned char *image8 = NULL;
	int			i, j, trows;
	byte		*source;
	int			frac, fracstep, ministep, row, width = 1, height = 1;
	float		vscale, t;
	qboolean	noresize = gl_config.arbTextureNonPowerOfTwo
							&& (width < gl_config.max_texsize)
							&& (height < gl_config.max_texsize);

	GL_Bind (0);

	if (noresize) // skip if nonstandard textures sizes are supported
	{
		width = cols;
		height = trows = rows;
		vscale = 1;
	}
	else
	{
		width = min(max(nearest_power_of_2(cols), 256), gl_config.max_texsize); // must be at least 256x256
		height = min(max(nearest_power_of_2(rows), 256), gl_config.max_texsize);
		if (rows <= 256)
		{
			vscale = 1;
			trows = rows;
		}
		else
		{
			vscale = (float)rows/(float)height;
			trows  = height;
		}
	}
	t = (float)rows*vscale / (float)height;

	if (!qglColorTableEXT)
	{
		unsigned *dest;

		image32 = malloc((width * height) * 4);
		memset(image32, 0, sizeof(image32));

		for (i=0; i<trows; i++)
		{
			row = (int)(i*vscale);
			if (row > rows)
				break;
			source = data + cols*row;
			dest = &image32[i*width];
			fracstep = (noresize) ? 1 : cols*rows;
			frac = (noresize) ? 0 : fracstep >> 1;
			for (j=0; j<width; j++)
			{
				ministep = (noresize) ? frac : frac>>16;
				dest[j] = r_rawpalette[source[ministep]];
				frac += fracstep;
			}
		}	
	//	qglTexImage2D (GL_TEXTURE_2D, 0, gl_tex_solid_format, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image32);
		qglTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image32);
	}
	else
	{
		unsigned char *dest;

		image8 = malloc(width * height);
		memset(image8, 0, sizeof(image8));

		for (i=0; i<trows; i++)
		{
			row = (int)(i*vscale);
			if (row > rows)
				break;
			source = data + cols*row;
			dest = &image8[i*width];
			fracstep = (noresize) ? 1 : cols*rows;
			frac = (noresize) ? 0 : fracstep >> 1;
			for (j=0; j<width; j++)
			{
				ministep = (noresize) ? frac : frac>>16;
				dest[j] = source[ministep];
				frac += fracstep;
			}
		}	
		qglTexImage2D( GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, width, height, 0, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, image8 );
	}

	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

	if ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) 
		qglDisable (GL_ALPHA_TEST);

	qglBegin (GL_QUADS);
	qglTexCoord2f (0, 0);
	qglVertex2f (x, y);
	qglTexCoord2f (1, 0);
	qglVertex2f (x+w, y);
	qglTexCoord2f (1, t);
	qglVertex2f (x+w, y+h);
	qglTexCoord2f (0, t);
	qglVertex2f (x, y+h);
	qglEnd ();

	if (image32)
		free(image32);
	if (image8)
		free(image8);

	if ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) 
		qglEnable (GL_ALPHA_TEST);
}
#else
void Draw_StretchRaw (int x, int y, int w, int h, int cols, int rows, byte *data)
{
	unsigned	image32[256*256];
	unsigned char image8[256*256];
	int			i, j, trows;
	byte		*source;
	int			frac, fracstep;
	float		hscale;
	int			row;
	float		t;

	// Nicolas' fix for stray pixels at bottom and top
	memset(image32, 0, sizeof(image32));

	GL_Bind (0);

	if (rows<=256)
	{
		hscale = 1;
		trows = rows;
	}
	else
	{
		hscale = rows/256.0;
		trows = 256;
	}
	t = rows*hscale / 256;

	if ( !qglColorTableEXT )
	{
		unsigned *dest;

		for (i=0 ; i<trows ; i++)
		{
			row = (int)(i*hscale);
			if (row > rows)
				break;
			source = data + cols*row;
			dest = &image32[i*256];
			fracstep = cols*0x10000/256;
			frac = fracstep >> 1;
			for (j=0 ; j<256 ; j++)
			{
				dest[j] = r_rawpalette[source[frac>>16]];
				frac += fracstep;
			}
		}

	//	qglTexImage2D (GL_TEXTURE_2D, 0, gl_tex_solid_format, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, image32);
		qglTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, image32);
	}
	else
	{
		unsigned char *dest;

		for (i=0 ; i<trows ; i++)
		{
			row = (int)(i*hscale);
			if (row > rows)
				break;
			source = data + cols*row;
			dest = &image8[i*256];
			fracstep = cols*0x10000/256;
			frac = fracstep >> 1;
			for (j=0 ; j<256 ; j++)
			{
				dest[j] = source[frac>>16];
				frac += fracstep;
			}
		}

		qglTexImage2D( GL_TEXTURE_2D, 
			           0, 
					   GL_COLOR_INDEX8_EXT, 
					   256, 256, 
					   0, 
					   GL_COLOR_INDEX, 
					   GL_UNSIGNED_BYTE, 
					   image8 );
	}
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	qglTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

	if ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) 
		qglDisable (GL_ALPHA_TEST);

	qglBegin (GL_QUADS);
	qglTexCoord2f (0, 0);
	qglVertex2f (x, y);
	qglTexCoord2f (1, 0);
	qglVertex2f (x+w, y);
	qglTexCoord2f (1, t);
	qglVertex2f (x+w, y+h);
	qglTexCoord2f (0, t);
	qglVertex2f (x, y+h);
	qglEnd ();

	if ( ( gl_config.renderer == GL_RENDERER_MCD ) || ( gl_config.renderer & GL_RENDERER_RENDITION ) ) 
		qglEnable (GL_ALPHA_TEST);
}
#endif