This is xmesaP.h in view mode; [Download] [Up]
/* $Id: xmesaP.h,v 1.17 1997/06/20 02:58:18 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.3
* Copyright (C) 1995-1997 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: xmesaP.h,v $
* Revision 1.17 1997/06/20 02:58:18 brianp
* added wasCurrent to xmesa_buffer struct
*
* Revision 1.16 1997/06/03 02:03:17 brianp
* removed unused stipple_ximage variable
*
* Revision 1.15 1997/05/26 20:34:40 brianp
* added PF_TRUEDITHER pixel format
*
* Revision 1.14 1997/04/27 02:42:52 brianp
* Optimized color table setup. Free X colormap entries when finished.
*
* Revision 1.13 1997/04/12 16:22:43 brianp
* removed XMesa declaration
*
* Revision 1.12 1997/04/04 05:23:57 brianp
* fixed problem with black/white being reversed on monochrome displays
*
* Revision 1.11 1997/03/16 02:16:52 brianp
* added PACK_8B8G8R macro
*
* Revision 1.10 1997/01/31 23:44:24 brianp
* added FLAT_DITHER macros inspired by code from Martin Schenk (schenkm@ping.at)
*
* Revision 1.9 1997/01/31 20:41:20 brianp
* added vishandle to xmesa_visual struct
*
* Revision 1.8 1997/01/08 20:54:02 brianp
* added DITHER666 option from Michael Pichler
*
* Revision 1.7 1996/10/22 02:54:35 brianp
* incorporated Jacques Leroy's changes to DITHER_HPCR macro
*
* Revision 1.6 1996/10/22 02:50:46 brianp
* new DITHER_SETUP, XDITHER_SETUP and XDITHER macros
* _MIX macro now uses shifts and ORs instead of mults and adds
*
* Revision 1.5 1996/09/27 17:10:20 brianp
* added index_bits field to XMesaVisual struct
*
* Revision 1.4 1996/09/27 01:32:12 brianp
* changed kernel1 array from 2-D to 1-D
*
* Revision 1.3 1996/09/19 03:16:04 brianp
* new X/Mesa interface with XMesaContext, XMesaVisual, and XMesaBuffer types
*
* Revision 1.2 1996/09/15 14:22:13 brianp
* now use GLframebuffer and GLvisual
*
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
#ifndef XMESAP_H
#define XMESAP_H
#ifdef SHM
# include <X11/extensions/XShm.h>
#endif
#include "GL/xmesa.h"
#include "types.h"
/*
* Mesa wrapper for XVisualInfo
*/
struct xmesa_visual {
GLvisual *gl_visual; /* Device independent visual parameters */
Display *display; /* The X11 display */
XVisualInfo *vishandle; /* The pointer returned by glXChooseVisual */
XVisualInfo *visinfo; /* Private copy of vishandle's struct */
GLint level; /* 0=normal, 1=overlay, etc */
GLboolean ximage_flag; /* Use XImage for back buffer (not pixmap)? */
GLuint dithered_pf; /* Pixel format when dithering */
GLuint undithered_pf; /* Pixel format when not dithering */
GLfloat RedGamma; /* Gamma values, 1.0 is default */
GLfloat GreenGamma;
GLfloat BlueGamma;
GLint rmult, gmult, bmult; /* Range of color values */
GLint index_bits; /* Bits per pixel in CI mode */
/* For PF_TRUECOLOR */
GLint rshift, gshift, bshift; /* Pixel color component shifts */
GLubyte Kernel[16]; /* Dither kernel */
unsigned long RtoPixel[512]; /* RGB to pixel conversion */
unsigned long GtoPixel[512];
unsigned long BtoPixel[512];
GLubyte PixelToR[256]; /* Pixel to RGB conversion */
GLubyte PixelToG[256];
GLubyte PixelToB[256];
/* For PF_HPCR */
short hpcr_rTbl[256], hpcr_gTbl[256], hpcr_bTbl[256];
/* For PF_1BIT */
int bitFlip;
};
/*
* Mesa wrapper for core rendering context
*/
struct xmesa_context {
GLcontext *gl_ctx; /* the core library context */
XMesaVisual xm_visual; /* Describes the buffers */
XMesaBuffer xm_buffer; /* current framebuffer */
Display *display; /* == xm_visual->display */
GLboolean swapbytes; /* Host byte order != display byte order? */
GLuint pixelformat; /* Current pixel format */
GLubyte red, green, blue, alpha;/* current drawing color */
unsigned long pixel; /* current drawing pixel value */
GLubyte clearcolor[4]; /* current clearing color */
unsigned long clearpixel; /* current clearing pixel value */
};
/*
* Mesa wrapper for X window or Pixmap
*/
struct xmesa_buffer {
GLboolean wasCurrent; /* was ever the current buffer? */
GLframebuffer *gl_buffer; /* depth, stencil, accum, etc buffers */
XMesaVisual xm_visual; /* the X/Mesa visual */
Display *display;
GLboolean pixmap_flag; /* is the buffer a Pixmap? */
Drawable frontbuffer; /* either a window or pixmap */
Pixmap backpixmap; /* back buffer Pixmap */
XImage *backimage; /* back buffer XImage */
Drawable buffer; /* the current buffer, either equal to */
/* frontbuffer, backpixmap or XIMAGE (None) */
Colormap cmap; /* the X colormap */
GLint db_state; /* 0 = single buffered */
/* BACK_PIXMAP = use Pixmap for back buffer */
/* BACK_XIMAGE = use XImage for back buffer */
GLuint shm; /* X Shared Memory extension status: */
/* 0 = not available */
/* 1 = XImage support available */
/* 2 = Pixmap support available too */
#ifdef SHM
XShmSegmentInfo shminfo;
#endif
XImage *rowimage; /* Used for optimized span writing */
GLuint width, height; /* size of buffer */
GLint bottom; /* used for FLIP macro below */
GLubyte *ximage_origin1; /* used for PIXELADDR1 macro */
GLint ximage_width1;
GLushort *ximage_origin2; /* used for PIXELADDR2 macro */
GLint ximage_width2;
GLuint *ximage_origin4; /* used for PIXELADDR4 macro */
GLint ximage_width4;
Pixmap stipple_pixmap; /* For polygon stippling */
GC stipple_gc; /* For polygon stippling */
GC gc1; /* GC for infrequent color changes */
GC gc2; /* GC for frequent color changes */
GC cleargc; /* GC for clearing the color buffer */
/* The following are here instead of in the XMesaVisual
* because they depend on the window's colormap.
*/
/* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
unsigned long color_table[576]; /* RGB -> pixel value */
/* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
GLubyte pixel_to_r[65536]; /* pixel value -> red */
GLubyte pixel_to_g[65536]; /* pixel value -> green */
GLubyte pixel_to_b[65536]; /* pixel value -> blue */
/* Used to do XAllocColor/XFreeColors accounting: */
int num_alloced;
unsigned long alloced_colors[256];
struct xmesa_buffer *Next; /* Linked list pointer: */
};
/* Values for xmesa->dest: */
#define FRONT_PIXMAP 1
#define BACK_PIXMAP 2
#define BACK_XIMAGE 4
/* Values for xmesa->pixelformat: */
#define PF_INDEX 1 /* Color Index mode */
#define PF_TRUECOLOR 2 /* TrueColor or DirectColor, any depth */
#define PF_TRUEDITHER 3 /* TrueColor with dithering */
#define PF_8A8B8G8R 4 /* 32-bit TrueColor: 8-A, 8-B, 8-G, 8-R */
#define PF_8R8G8B 5 /* 32-bit TrueColor: 8-R, 8-G, 8-B bits */
#define PF_5R6G5B 6 /* 16-bit TrueColor: 5-R, 6-G, 5-B bits */
#define PF_DITHER 7 /* Color-mapped RGB with dither */
#define PF_LOOKUP 8 /* Color-mapped RGB without dither */
#define PF_HPCR 9 /* HP Color Recovery (ad@lms.be 30/08/95) */
#define PF_1BIT 10 /* monochrome dithering of RGB */
#define PF_GRAYSCALE 11 /* Grayscale or StaticGray */
/*
* If pixelformat==PF_TRUECOLOR:
*/
#define PACK_TRUECOLOR( PIXEL, R, G, B ) \
PIXEL = xmesa->xm_visual->RtoPixel[R] \
| xmesa->xm_visual->GtoPixel[G] \
| xmesa->xm_visual->BtoPixel[B]; \
/*
* If pixelformat==PF_TRUEDITHER:
*/
#define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B ) \
{ \
int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)]; \
PIXEL = xmesa->xm_visual->RtoPixel[(R)+d] \
| xmesa->xm_visual->GtoPixel[(G)+d] \
| xmesa->xm_visual->BtoPixel[(B)+d]; \
}
/*
* If pixelformat==PF_8A8B8G8R:
*/
#define PACK_8A8B8G8R( R, G, B, A ) \
( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
/*
* Like PACK_8A8B8G8R() but don't use alpha. This is usually an acceptable
* shortcut.
*/
#define PACK_8B8G8R( R, G, B ) ( ((B) << 16) | ((G) << 8) | (R) )
/*
* If pixelformat==PF_8R8G8B:
*/
#define PACK_8R8G8B( R, G, B) ( ((R) << 16) | ((G) << 8) | (B) )
/*
* If pixelformat==PF_5R6G5B:
*/
#define PACK_5R6G5B( R, G, B) ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
/*
* If pixelformat==PF_DITHER:
*
* Improved 8-bit RGB dithering code contributed by Bob Mercier
* (mercier@hollywood.cinenet.net). Thanks Bob!
*/
#ifdef DITHER666
# define _R 6
# define _G 6
# define _B 6
# define _MIX(r,g,b) (((r)*_G+(g))*_B+(b))
#else
# define _R 5
# define _G 9
# define _B 5
# define _MIX(r,g,b) ( ((g)<<6) | ((b)<<3) | (r) )
#endif
#define _DX 4
#define _DY 4
#define _D (_DX*_DY)
/*#define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d))/(_D*256))*/
#define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d)) >> 12)
#define MAXC 256
static int kernel8[_DY*_DX] = {
0 * MAXC, 8 * MAXC, 2 * MAXC, 10 * MAXC,
12 * MAXC, 4 * MAXC, 14 * MAXC, 6 * MAXC,
3 * MAXC, 11 * MAXC, 1 * MAXC, 9 * MAXC,
15 * MAXC, 7 * MAXC, 13 * MAXC, 5 * MAXC,
};
/*static int __d;*/
/* Dither for random X,Y */
#define DITHER_SETUP \
int __d; \
unsigned long *ctable = xmesa->xm_buffer->color_table;
#define DITHER( X, Y, R, G, B ) \
(__d = kernel8[(((Y)&3)<<2) | ((X)&3)], \
ctable[_MIX(_DITH(_R, (R), __d), \
_DITH(_G, (G), __d), \
_DITH(_B, (B), __d))])
/* Dither for random X, fixed Y */
#define XDITHER_SETUP(Y) \
int __d; \
unsigned long *ctable = xmesa->xm_buffer->color_table; \
int *kernel = &kernel8[ ((Y)&3) << 2 ];
#define XDITHER( X, R, G, B ) \
(__d = kernel[(X)&3], \
ctable[_MIX(_DITH(_R, (R), __d), \
_DITH(_G, (G), __d), \
_DITH(_B, (B), __d))])
/*
* Dithering for flat-shaded triangles. Precompute all 16 possible
* pixel values given the triangle's RGB color. Contributed by Martin Shenk.
*/
static GLushort DitherValues[16]; /* array of (up to) 16-bit pixel values */
#define FLAT_DITHER_SETUP( R, G, B ) \
{ \
unsigned long *ctable = xmesa->xm_buffer->color_table; \
int msdr = (_D*((_R)-1)+1) * (R); \
int msdg = (_D*((_G)-1)+1) * (G); \
int msdb = (_D*((_B)-1)+1) * (B); \
int i; \
for (i=0;i<16;i++) { \
int k = kernel8[i]; \
int j = _MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 ); \
DitherValues[i] = ctable[j]; \
} \
}
#define FLAT_DITHER_ROW_SETUP(Y) \
GLushort *ditherRow = DitherValues + ( ((Y)&3) << 2);
#define FLAT_DITHER(X) ditherRow[(X)&3]
/*
* If pixelformat==PF_LOOKUP:
*/
#define _DITH0(C,c) (((unsigned)((_D*(C-1)+1)*c)) >> 12)
#define LOOKUP_SETUP \
unsigned long *ctable = xmesa->xm_buffer->color_table
#define LOOKUP( R, G, B ) \
ctable[_MIX(_DITH0(_R, (R)), \
_DITH0(_G, (G)), \
_DITH0(_B, (B)))]
/*
* If pixelformat==PF_HPCR:
*
* HP Color Recovery dithering (ad@lms.be 30/08/95)
* HP has on it's 8-bit 700-series computers, a feature called
* 'Color Recovery'. This allows near 24-bit output (so they say).
* It is enabled by selecting the 8-bit TrueColor visual AND
* corresponding colormap (see tkInitWindow) AND doing some special
* dither.
*/
static const short HPCR_DR[2][16] = {
{ 16, -4, 1,-11, 14, -6, 3, -9, 15, -5, 2,-10, 13, -7, 4, -8},
{-15, 5, 0, 12,-13, 7, -2, 10,-14, 6, -1, 11,-12, 8, -3, 9} };
static const short HPCR_DG[2][16] = {
{-11, 15, -7, 3, -8, 14, -4, 2,-10, 16, -6, 4, -9, 13, -5, 1},
{ 12,-14, 8, -2, 9,-13, 5, -1, 11,-15, 7, -3, 10,-12, 6, 0} };
static const short HPCR_DB[2][16] = {
{ 6,-18, 26,-14, 2,-22, 30,-10, 8,-16, 28,-12, 4,-20, 32, -8},
{ -4, 20,-24, 16, 0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10} };
#define DITHER_HPCR( X, Y, R, G, B ) \
( ((xmesa->xm_visual->hpcr_rTbl[R] + HPCR_DR[(Y)&1][(X)&15]) & 0xE0) \
|(((xmesa->xm_visual->hpcr_gTbl[G] + HPCR_DG[(Y)&1][(X)&15]) & 0xE0)>>3) \
| ((xmesa->xm_visual->hpcr_bTbl[B] + HPCR_DB[(Y)&1][(X)&15])>>6) \
)
/*
* If pixelformat==PF_1BIT:
*/
static int const kernel1[16] = {
0*47, 9*47, 4*47, 12*47, /* 47 = (255*3)/16 */
6*47, 2*47, 14*47, 8*47,
10*47, 1*47, 5*47, 11*47,
7*47, 13*47, 3*47, 15*47 };
#define SETUP_1BIT int bitFlip = xmesa->xm_visual->bitFlip
#define DITHER_1BIT( X, Y, R, G, B ) \
(( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
/*
* If pixelformat==PF_GRAYSCALE:
*/
#define GRAY_RGB( R, G, B ) xmesa->xm_buffer->color_table[(R) + (G) + (B)]
#define XIMAGE None
/*
* Converts a GL window Y coord to an X window Y coord:
*/
#define FLIP(Y) (xmesa->xm_buffer->bottom-(Y))
/*
* Return the address of a 1, 2 or 4-byte pixel in the back XImage:
* X==0 is left, Y==0 is bottom.
*/
#define PIXELADDR1( X, Y ) \
( xmesa->xm_buffer->ximage_origin1 - (Y) * xmesa->xm_buffer->ximage_width1 + (X) )
#define PIXELADDR2( X, Y ) \
( xmesa->xm_buffer->ximage_origin2 - (Y) * xmesa->xm_buffer->ximage_width2 + (X) )
#define PIXELADDR4( X, Y ) \
( xmesa->xm_buffer->ximage_origin4 - (Y) * xmesa->xm_buffer->ximage_width4 + (X) )
/*
* External functions:
*/
extern unsigned long xmesa_color_to_pixel( XMesaContext xmesa,
GLubyte r, GLubyte g, GLubyte b, GLubyte a );
extern void xmesa_alloc_back_buffer( XMesaBuffer b );
extern void xmesa_setup_DD_pointers( GLcontext *ctx );
extern points_func xmesa_get_points_func( GLcontext *ctx );
extern line_func xmesa_get_line_func( GLcontext *ctx );
extern triangle_func xmesa_get_triangle_func( GLcontext *ctx );
#endif
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.