/* xmesaP.h */ /* * Mesa 3-D graphics library * Version: 1.2 * Copyright (C) 1995 Brian Paul (brianp@ssec.wisc.edu) * * 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. */ /* $Id: xmesaP.h,v 1.19 1995/11/30 00:51:40 brianp Exp $ $Log: xmesaP.h,v $ * Revision 1.19 1995/11/30 00:51:40 brianp * added casts to DITHER_HPCR macro to silence Sun compiler warnings * * Revision 1.18 1995/11/30 00:20:39 brianp * added new PF_GRAYSCALE mode * * Revision 1.17 1995/10/30 15:14:21 brianp * replaced Current variable with XMesa * * Revision 1.16 1995/10/19 15:50:38 brianp * added rgb_flag and share_list fields * * Revision 1.15 1995/10/17 21:38:17 brianp * many changes for new X/Mesa device driver * * Revision 1.14 1995/09/15 18:49:25 brianp * added rowimage span buffer * * Revision 1.13 1995/08/24 22:07:40 brianp * added swapbytes field * * Revision 1.12 1995/07/24 19:02:30 brianp * new comments for PF_DITHER and its tables * * Revision 1.11 1995/05/31 14:59:55 brianp * shm field not dependent on SHM symbol * * Revision 1.10 1995/05/22 20:59:34 brianp * Release 1.2 * * Revision 1.9 1995/04/17 13:57:14 brianp * changed to support GLXPixmaps * * Revision 1.8 1995/03/30 21:10:12 brianp * replaced colorpacking with pixelformat * * Revision 1.7 1995/03/22 21:38:17 brianp * *** empty log message *** * * Revision 1.6 1995/03/13 20:56:23 brianp * removed drawbuffer and readbuffer fields * * Revision 1.5 1995/03/08 15:10:02 brianp * added support for dd_logicop * added dd_clear_index and dd_clear_color * * Revision 1.4 1995/03/07 14:21:36 brianp * updated for new XSetForeground/GC scheme * * Revision 1.3 1995/03/04 19:25:29 brianp * 1.1 beta revision * * Revision 1.2 1995/03/02 19:31:42 brianp * added defines for FRONT_PIXMAP, BACK_PIXMAP, and BACK_XIMAGE * * Revision 1.1 1995/02/28 21:23:31 brianp * Initial revision * */ #ifndef XMESAP_H #define XMESAP_H #ifdef SHM # include #endif #include "GL/xmesa.h" #include "context.h" /* * This struct is used by xmesa[12].c and glx.c only! */ struct xmesa_context { struct gl_context *gl_ctx; /* the core library context */ GLboolean initialized; /* Is this context initialized yet? */ GLboolean rgb_flag; /* In RGBA mode? */ struct xmesa_context *share_list; Display *display; /* the X11 display */ Visual *visual; /* the X11 visual */ GC gc1; /* GC for infrequent color changes */ GC gc2; /* GC for frequent color changes */ GC cleargc; /* GC for clearing the color buffer */ GLboolean swapbytes; /* TRUE if byte-swapping is needed */ GLuint db_state; /* 0 = single buffered */ /* BACK_PIXMAP = use Pixmap for back buffer */ /* BACK_XIMAGE = use XImage for back buffer */ 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) */ 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 */ GLuint depth; /* bits per pixel (1, 8, 24, etc) */ GLubyte red, green, blue; /* current drawing color */ unsigned long pixel; /* current color index or RGBA pixel value */ unsigned long clearpixel; /* pixel for clearing the color buffers */ GLuint pixelformat; /* Current pixel format */ GLuint dithered_pf; /* Pixel format when dithering */ GLuint undithered_pf; /* Pixel format when not dithering */ /* For PF_TRUECOLOR */ GLint rmult, gmult, bmult, amult; /* Multiplier */ GLint rshift, gshift, bshift, ashift; /* Bit shifts */ /* For PF_DITHER */ unsigned long color_table[256]; /* RGB -> pixel value */ GLubyte red_table[65536]; /* pixel value -> red */ GLubyte green_table[65536]; /* pixel value -> green */ GLubyte blue_table[65536]; /* pixel value -> blue */ }; /* 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_8A8B8G8R 3 /* a special case of PF_TRUECOLOR */ #define PF_DITHER 4 /* Dithered RGB using a lookup table */ #define PF_1BIT 5 /* monochrome dithering of RGB */ #define PF_HPCR 6 /* HP Color Recovery (ad@lms.be 30/08/95) */ #define PF_LOOKUP 7 /* alternative to PF_DITHER */ #define PF_GRAYSCALE 8 /* Grayscale or StaticGray */ /* * If pixelformat==PF_TRUECOLOR: */ #define PACK_RGB( R, G, B ) \ ( ((R) << XMesa->rshift) \ | ((G) << XMesa->gshift) \ | ((B) << XMesa->bshift) ) #define PACK_RGBA( R, G, B, A ) \ ( ((R) << XMesa->rshift) \ | ((G) << XMesa->gshift) \ | ((B) << XMesa->bshift) \ | ((A) << XMesa->ashift) ) /* * If pixelformat==PF_1BIT: */ static int kernel1[4][4] = { 0*47, 9*47, 4*47, 12*47, 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 DITHER_1BIT( X, Y, R, G, B ) \ ( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(X)&3][(Y)&3] ) /* * If pixelformat==PF_DITHER: * * Improved 8-bit RGB dithering code contributed by Bob Mercier * (mercier@hollywood.cinenet.net). Thanks Bob! */ #define _R 5 #define _G 9 #define _B 5 #define _DX 4 #define _DY 4 #define _D (_DX*_DY) #define _MIX(r,g,b) (((r)*_G+(g))*_B+(b)) /*#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; #define DITHER_8BIT( X, Y, R, G, B ) \ (__d = kernel8[(Y)&(_DY-1)][(X)&(_DX-1)], \ XMesa->color_table[_MIX(_DITH(_R, (R), __d), \ _DITH(_G, (G), __d), \ _DITH(_B, (B), __d))]) /* * If pixelformat==PF_LOOKUP: */ #define _DITH0(C,c) (((unsigned)((_D*(C-1)+1)*c)) >> 12) #define LOOKUP( R, G, B ) \ XMesa->color_table[_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 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 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 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} }; static int _hpcr_x, _hpcr_y; #define DITHER_HPCR( X, Y, R, G, B ) \ (_hpcr_x=((X)%16), _hpcr_y=((Y)%2), \ ( (((((R) >= 48) ? ((int)(R) - 16) : ((int)(R)/2 + 16)) + HPCR_DR[_hpcr_y][_hpcr_x]) & 0xE0) \ |((((((G) >= 48) ? ((int)(G) - 16) : ((int)(G)/2 + 16)) + HPCR_DG[_hpcr_y][_hpcr_x]) & 0xE0)>>3) \ | (((((B) >= 112) ? ((int)(B) - 32) : ((int)(B)/2 + 32)) + HPCR_DB[_hpcr_y][_hpcr_x])>>6) \ ) \ ) /* * If pixelformat==PF_GRAYSCALE: */ #define GRAY_RGB( R, G, B ) XMesa->color_table[(R) + (G) + (B)] #define XIMAGE None /* * Useful macros: */ #define OFFSET1( X, Y ) ((XMesa->height-(Y)-1) * XMesa->backimage->bytes_per_line + (X)) #define OFFSET4( X, Y ) ((XMesa->height-(Y)-1) * XMesa->width + (X)) #define FLIP(Y) (XMesa->height-(Y)-1) extern XMesaContext XMesa; extern void xmesa_alloc_back_buffer( XMesaContext c ); extern void xmesa_setup_DD_pointers( void ); extern points_func xmesa_get_points_func( void ); extern line_func xmesa_get_line_func( void ); extern polygon_func xmesa_get_polygon_func( void ); #endif