src/mesa/drivers/x11/xmesaP.h

   1 /* $Id: xmesaP.h,v 1.7 2000/02/22 17:14:02 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #ifndef XMESAP_H
  29 #define XMESAP_H
  30
  31
  32 #ifdef XFree86Server
  33 # include "GL/xf86glx.h"
  34 # include "xf86glx_util.h"
  35 #else
  36 # ifdef GLX_DIRECT_RENDERING
  37 #  include "dri_mesa.h"
  38 # endif
  39 # ifdef USE_XSHM
  40 #  include <X11/extensions/XShm.h>
  41 # endif
  42 #endif
  43 #include "GL/xmesa.h"
  44 #include "types.h"
  45 #if defined(FX) && !defined(GLX_DIRECT_RENDERING)
  46 #include "GL/fxmesa.h"
  47 #include "../FX/fxdrv.h"
  48 #endif
  49
  50
  51 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
  52 #  include "xdriP.h"
  53 #else
  54 #  define DRI_DRAWABLE_ARG
  55 #  define DRI_DRAWABLE_PARM
  56 #  define DRI_CTX_ARG
  57 #endif
  58
  59
  60 /* for PF_8R8G8B24 pixel format */
  61 typedef struct {
  62    GLubyte b;
  63    GLubyte g;
  64    GLubyte r;
  65 } bgr_t;
  66
  67
  68 /* Function pointer for clearing color buffers */
  69 typedef void (*clear_func)( GLcontext *ctx,
  70                             GLboolean all, GLint x, GLint y,
  71                             GLint width, GLint height );
  72
  73
  74 /*
  75  * "Derived" from gl_visual.  Basically corresponds to an XVisualInfo.
  76  */
  77 struct xmesa_visual {
  78    GLvisual *gl_visual;         /* Device independent visual parameters */
  79    XMesaDisplay *display;       /* The X11 display */
  80 #ifdef XFree86Server
  81    GLint screen_depth;  /* The depth of the screen */
  82 #else
  83    XVisualInfo *vishandle;      /* The pointer returned by glXChooseVisual */
  84 #endif
  85    XMesaVisualInfo visinfo;     /* X's visual info */
  86    GLint BitsPerPixel;          /* True bits per pixel for XImages */
  87
  88    GLint level;                 /* 0=normal, 1=overlay, etc */
  89
  90    GLboolean ximage_flag;       /* Use XImage for back buffer (not pixmap)? */
  91
  92    GLuint dithered_pf;          /* Pixel format when dithering */
  93    GLuint undithered_pf;        /* Pixel format when not dithering */
  94
  95    GLfloat RedGamma;            /* Gamma values, 1.0 is default */
  96    GLfloat GreenGamma;
  97    GLfloat BlueGamma;
  98
  99    GLint rmult, gmult, bmult;   /* Range of color values */
 100    GLint index_bits;            /* Bits per pixel in CI mode */
 101
 102    /* For PF_TRUECOLOR */
 103    GLint rshift, gshift, bshift;/* Pixel color component shifts */
 104    GLubyte Kernel[16];          /* Dither kernel */
 105    unsigned long RtoPixel[512]; /* RGB to pixel conversion */
 106    unsigned long GtoPixel[512];
 107    unsigned long BtoPixel[512];
 108    GLubyte PixelToR[256];       /* Pixel to RGB conversion */
 109    GLubyte PixelToG[256];
 110    GLubyte PixelToB[256];
 111
 112    /* For PF_HPCR */
 113    short       hpcr_rgbTbl[3][256];
 114    GLboolean   hpcr_clear_flag;
 115    GLubyte     hpcr_clear_ximage_pattern[2][16];
 116    XMesaImage *hpcr_clear_ximage;
 117    XMesaPixmap hpcr_clear_pixmap;
 118
 119    /* For PF_1BIT */
 120    int bitFlip;
 121 };
 122
 123
 124
 125 /*
 126  * "Derived" from gl_context.  Basically corresponds to a GLXContext.
 127  */
 128 struct xmesa_context {
 129    GLcontext *gl_ctx;           /* the core library context */
 130    XMesaVisual xm_visual;       /* Describes the buffers */
 131    XMesaBuffer xm_buffer;       /* current draw framebuffer */
 132    XMesaBuffer xm_read_buffer;  /* current read framebuffer */
 133    GLboolean use_read_buffer;   /* read from the xm_read_buffer/ */
 134
 135    XMesaDisplay *display;       /* == xm_visual->display */
 136    GLboolean swapbytes;         /* Host byte order != display byte order? */
 137    GLboolean direct;            /* Direct rendering context? */
 138
 139    GLuint pixelformat;          /* Current pixel format */
 140
 141    GLubyte red, green, blue, alpha;     /* current drawing color */
 142    unsigned long pixel;                 /* current drawing pixel value */
 143
 144    GLubyte clearcolor[4];               /* current clearing color */
 145    unsigned long clearpixel;            /* current clearing pixel value */
 146
 147 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
 148   __DRIcontextPrivate *driContextPriv; /* back pointer to DRI context
 149                                         * used for locking
 150                                         */
 151   void *private;                        /* device-specific private context */
 152 #endif
 153 };
 154
 155
 156
 157 /*
 158  * "Derived" from gl_buffer.  Basically corresponds to a GLXDrawable.
 159  */
 160 struct xmesa_buffer {
 161    GLboolean wasCurrent;        /* was ever the current buffer? */
 162    GLframebuffer *gl_buffer;    /* depth, stencil, accum, etc buffers */
 163    XMesaVisual xm_visual;       /* the X/Mesa visual */
 164
 165    XMesaContext xm_context;     /* the context associated with this buffer */
 166    XMesaDisplay *display;
 167    GLboolean pixmap_flag;       /* is the buffer a Pixmap? */
 168    XMesaDrawable frontbuffer;   /* either a window or pixmap */
 169    XMesaPixmap backpixmap;      /* back buffer Pixmap */
 170    XMesaImage *backimage;       /* back buffer simulated XImage */
 171
 172    XMesaDrawable buffer;        /* the current buffer, either equal to */
 173                                 /* frontbuffer, backpixmap or XIMAGE (None) */
 174
 175    XMesaColormap cmap;          /* the X colormap */
 176
 177    GLint db_state;              /* 0 = single buffered */
 178                                 /* BACK_PIXMAP = use Pixmap for back buffer */
 179                                 /* BACK_XIMAGE = use XImage for back buffer */
 180
 181 #ifndef XFree86Server
 182    GLuint shm;                  /* X Shared Memory extension status:    */
 183                                 /*    0 = not available                 */
 184                                 /*    1 = XImage support available      */
 185                                 /*    2 = Pixmap support available too  */
 186 #ifdef USE_XSHM
 187    XShmSegmentInfo shminfo;
 188 #endif
 189 #endif
 190
 191    XMesaImage *rowimage;        /* Used for optimized span writing */
 192
 193    GLuint width, height;        /* size of buffer */
 194
 195    GLint bottom;                /* used for FLIP macro below */
 196    GLubyte *ximage_origin1;     /* used for PIXELADDR1 macro */
 197    GLint ximage_width1;
 198    GLushort *ximage_origin2;    /* used for PIXELADDR2 macro */
 199    GLint ximage_width2;
 200    GLubyte *ximage_origin3;     /* used for PIXELADDR3 macro */
 201    GLint ximage_width3;
 202    GLuint *ximage_origin4;      /* used for PIXELADDR4 macro */
 203    GLint ximage_width4;
 204
 205    XMesaPixmap stipple_pixmap;  /* For polygon stippling */
 206    XMesaGC stipple_gc;          /* For polygon stippling */
 207
 208    XMesaGC gc1;                 /* GC for infrequent color changes */
 209    XMesaGC gc2;                 /* GC for frequent color changes */
 210    XMesaGC cleargc;             /* GC for clearing the color buffer */
 211
 212    /* The following are here instead of in the XMesaVisual
 213     * because they depend on the window's colormap.
 214     */
 215
 216    /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
 217    unsigned long color_table[576];      /* RGB -> pixel value */
 218
 219    /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
 220    GLubyte pixel_to_r[65536];           /* pixel value -> red */
 221    GLubyte pixel_to_g[65536];           /* pixel value -> green */
 222    GLubyte pixel_to_b[65536];           /* pixel value -> blue */
 223
 224    /* Used to do XAllocColor/XFreeColors accounting: */
 225    int num_alloced;
 226    unsigned long alloced_colors[256];
 227
 228 #if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
 229   __DRIdrawablePrivate *driDrawPriv;    /* back pointer to DRI drawable
 230                                          * used for direct access to framebuffer
 231                                          */
 232   void *private;                        /* device-specific private drawable */
 233 #endif
 234
 235 #if defined( FX ) && !defined(GLX_DIRECT_RENDERING)
 236    /* For 3Dfx Glide only */
 237    GLboolean FXisHackUsable;    /* Can we render into window? */
 238    GLboolean FXwindowHack;      /* Are we rendering into a window? */
 239    fxMesaContext FXctx;
 240 #endif
 241
 242    /* functions for clearing the front and back color buffers */
 243    clear_func front_clear_func;
 244    clear_func back_clear_func;
 245
 246    struct xmesa_buffer *Next;   /* Linked list pointer: */
 247 };
 248
 249
 250
 251 /* Values for xmesa->dest: */
 252 #define FRONT_PIXMAP    1
 253 #define BACK_PIXMAP     2
 254 #define BACK_XIMAGE     4
 255
 256
 257 /* Values for xmesa->pixelformat: */
 258 #define PF_INDEX          1     /* Color Index mode */
 259 #define PF_TRUECOLOR      2     /* TrueColor or DirectColor, any depth */
 260 #define PF_TRUEDITHER     3     /* TrueColor with dithering */
 261 #define PF_8A8B8G8R       4     /* 32-bit TrueColor:  8-A, 8-B, 8-G, 8-R */
 262 #define PF_8R8G8B         5     /* 32-bit TrueColor:  8-R, 8-G, 8-B bits */
 263 #define PF_5R6G5B         6     /* 16-bit TrueColor:  5-R, 6-G, 5-B bits */
 264 #define PF_DITHER         7     /* Color-mapped RGB with dither */
 265 #define PF_LOOKUP         8     /* Color-mapped RGB without dither */
 266 #define PF_HPCR           9     /* HP Color Recovery (ad@lms.be 30/08/95) */
 267 #define PF_1BIT          10     /* monochrome dithering of RGB */
 268 #define PF_GRAYSCALE     11     /* Grayscale or StaticGray */
 269 #define PF_8R8G8B24      12     /* 24-bit TrueColor: 8-R, 8-G, 8-B bits */
 270 #define PF_DITHER_5R6G5B 13     /* 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
 271
 272
 273 /*
 274  * If pixelformat==PF_TRUECOLOR:
 275  */
 276 #define PACK_TRUECOLOR( PIXEL, R, G, B )        \
 277    PIXEL = xmesa->xm_visual->RtoPixel[R]        \
 278          | xmesa->xm_visual->GtoPixel[G]        \
 279          | xmesa->xm_visual->BtoPixel[B];       \
 280
 281
 282 /*
 283  * If pixelformat==PF_TRUEDITHER:
 284  */
 285 #define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B )                 \
 286 {                                                               \
 287    int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)];    \
 288    PIXEL = xmesa->xm_visual->RtoPixel[(R)+d]                    \
 289          | xmesa->xm_visual->GtoPixel[(G)+d]                    \
 290          | xmesa->xm_visual->BtoPixel[(B)+d];                   \
 291 }
 292
 293
 294
 295 /*
 296  * If pixelformat==PF_8A8B8G8R:
 297  */
 298 #define PACK_8A8B8G8R( R, G, B, A )     \
 299         ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
 300
 301
 302 /*
 303  * Like PACK_8A8B8G8R() but don't use alpha.  This is usually an acceptable
 304  * shortcut.
 305  */
 306 #define PACK_8B8G8R( R, G, B )   ( ((B) << 16) | ((G) << 8) | (R) )
 307
 308
 309
 310 /*
 311  * If pixelformat==PF_8R8G8B:
 312  */
 313 #define PACK_8R8G8B( R, G, B)    ( ((R) << 16) | ((G) << 8) | (B) )
 314
 315
 316 /*
 317  * If pixelformat==PF_5R6G5B:
 318  */
 319 #define PACK_5R6G5B( R, G, B)    ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
 320
 321
 322
 323
 324 /*
 325  * If pixelformat==PF_DITHER:
 326  *
 327  * Improved 8-bit RGB dithering code contributed by Bob Mercier
 328  * (mercier@hollywood.cinenet.net).  Thanks Bob!
 329  */
 330 #undef _R
 331 #undef _G
 332 #undef _B
 333 #undef _D
 334 #ifdef DITHER666
 335 # define _R   6
 336 # define _G   6
 337 # define _B   6
 338 # define _MIX(r,g,b)  (((r)*_G+(g))*_B+(b))
 339 #else
 340 # define _R     5
 341 # define _G     9
 342 # define _B     5
 343 # define _MIX(r,g,b)    ( ((g)<<6) | ((b)<<3) | (r) )
 344 #endif
 345 #define _DX     4
 346 #define _DY     4
 347 #define _D      (_DX*_DY)
 348
 349 /*#define _DITH(C,c,d)  (((unsigned)((_D*(C-1)+1)*c+d))/(_D*256))*/
 350 #define _DITH(C,c,d)    (((unsigned)((_D*(C-1)+1)*c+d)) >> 12)
 351
 352 #define MAXC    256
 353 static int kernel8[_DY*_DX] = {
 354     0 * MAXC,  8 * MAXC,  2 * MAXC, 10 * MAXC,
 355    12 * MAXC,  4 * MAXC, 14 * MAXC,  6 * MAXC,
 356     3 * MAXC, 11 * MAXC,  1 * MAXC,  9 * MAXC,
 357    15 * MAXC,  7 * MAXC, 13 * MAXC,  5 * MAXC,
 358 };
 359 /*static int __d;*/
 360
 361 /* Dither for random X,Y */
 362 #define DITHER_SETUP                                            \
 363         int __d;                                                \
 364         unsigned long *ctable = xmesa->xm_buffer->color_table;
 365
 366 #define DITHER( X, Y, R, G, B )                         \
 367         (__d = kernel8[(((Y)&3)<<2) | ((X)&3)],         \
 368          ctable[_MIX(_DITH(_R, (R), __d),               \
 369                      _DITH(_G, (G), __d),               \
 370                      _DITH(_B, (B), __d))])
 371
 372 /* Dither for random X, fixed Y */
 373 #define XDITHER_SETUP(Y)                                        \
 374         int __d;                                                \
 375         unsigned long *ctable = xmesa->xm_buffer->color_table;  \
 376         int *kernel = &kernel8[ ((Y)&3) << 2 ];
 377
 378 #define XDITHER( X, R, G, B )                           \
 379         (__d = kernel[(X)&3],                           \
 380         ctable[_MIX(_DITH(_R, (R), __d),                \
 381                     _DITH(_G, (G), __d),                \
 382                     _DITH(_B, (B), __d))])
 383
 384
 385
 386 /*
 387  * Dithering for flat-shaded triangles.  Precompute all 16 possible
 388  * pixel values given the triangle's RGB color.  Contributed by Martin Shenk.
 389  */
 390 static GLushort DitherValues[16];   /* array of (up to) 16-bit pixel values */
 391
 392 #define FLAT_DITHER_SETUP( R, G, B )                                    \
 393         {                                                               \
 394            unsigned long *ctable = xmesa->xm_buffer->color_table;       \
 395            int msdr = (_D*((_R)-1)+1) * (R);                            \
 396            int msdg = (_D*((_G)-1)+1) * (G);                            \
 397            int msdb = (_D*((_B)-1)+1) * (B);                            \
 398            int i;                                                       \
 399            for (i=0;i<16;i++) {                                         \
 400               int k = kernel8[i];                                       \
 401               int j = _MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 ); \
 402               DitherValues[i] = (GLushort) ctable[j];                   \
 403            }                                                            \
 404         }
 405
 406 #define FLAT_DITHER_ROW_SETUP(Y)                                        \
 407         GLushort *ditherRow = DitherValues + ( ((Y)&3) << 2);
 408
 409 #define FLAT_DITHER(X)  ditherRow[(X)&3]
 410
 411
 412
 413 /*
 414  * If pixelformat==PF_LOOKUP:
 415  */
 416 #define _DITH0(C,c)     (((unsigned)((_D*(C-1)+1)*c)) >> 12)
 417
 418 #define LOOKUP_SETUP                                            \
 419         unsigned long *ctable = xmesa->xm_buffer->color_table
 420
 421 #define LOOKUP( R, G, B )                       \
 422         ctable[_MIX(_DITH0(_R, (R)),            \
 423                     _DITH0(_G, (G)),            \
 424                     _DITH0(_B, (B)))]
 425
 426
 427
 428 /*
 429  * If pixelformat==PF_HPCR:
 430  *
 431  *      HP Color Recovery dithering               (ad@lms.be 30/08/95)
 432  *      HP has on it's 8-bit 700-series computers, a feature called
 433  *      'Color Recovery'.  This allows near 24-bit output (so they say).
 434  *      It is enabled by selecting the 8-bit  TrueColor  visual AND
 435  *      corresponding  colormap (see tkInitWindow) AND doing some special
 436  *      dither.
 437  */
 438 static const short HPCR_DRGB[3][2][16] = {
 439 {
 440     { 16, -4,  1,-11, 14, -6,  3, -9, 15, -5,  2,-10, 13, -7,  4, -8},
 441     {-15,  5,  0, 12,-13,  7, -2, 10,-14,  6, -1, 11,-12,  8, -3,  9}
 442 },
 443 {
 444     {-11, 15, -7,  3, -8, 14, -4,  2,-10, 16, -6,  4, -9, 13, -5,  1},
 445     { 12,-14,  8, -2,  9,-13,  5, -1, 11,-15,  7, -3, 10,-12,  6,  0}
 446 },
 447 {
 448     {  6,-18, 26,-14,  2,-22, 30,-10,  8,-16, 28,-12,  4,-20, 32, -8},
 449     { -4, 20,-24, 16,  0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10}
 450 }
 451 };
 452
 453 #define DITHER_HPCR( X, Y, R, G, B )                                       \
 454   ( ((xmesa->xm_visual->hpcr_rgbTbl[0][R] + HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0)     \
 455   |(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
 456   | ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + HPCR_DRGB[2][(Y)&1][(X)&15])>>6)       \
 457   )
 458
 459
 460
 461 /*
 462  * If pixelformat==PF_1BIT:
 463  */
 464 static int const kernel1[16] = {
 465    0*47,  9*47,  4*47, 12*47,     /* 47 = (255*3)/16 */
 466    6*47,  2*47, 14*47,  8*47,
 467   10*47,  1*47,  5*47, 11*47,
 468    7*47, 13*47,  3*47, 15*47 };
 469
 470 #define SETUP_1BIT  int bitFlip = xmesa->xm_visual->bitFlip
 471 #define DITHER_1BIT( X, Y, R, G, B )    \
 472         (( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
 473
 474
 475
 476 /*
 477  * If pixelformat==PF_GRAYSCALE:
 478  */
 479 #define GRAY_RGB( R, G, B )   xmesa->xm_buffer->color_table[((R) + (G) + (B))/3]
 480
 481
 482
 483 #define XIMAGE None
 484
 485
 486 /*
 487  * Converts a GL window Y coord to an X window Y coord:
 488  */
 489 #define FLIP(BUFFER, Y)  ((BUFFER)->bottom-(Y))
 490
 491
 492 /*
 493  * Return the address of a 1, 2 or 4-byte pixel in the back XImage:
 494  * X==0 is left, Y==0 is bottom.
 495  */
 496 #define PIXELADDR1( BUFFER, X, Y )  \
 497    ( (BUFFER)->ximage_origin1 - (Y) * (BUFFER)->ximage_width1 + (X) )
 498
 499 #define PIXELADDR2( BUFFER, X, Y )  \
 500    ( (BUFFER)->ximage_origin2 - (Y) * (BUFFER)->ximage_width2 + (X) )
 501
 502 #define PIXELADDR3( BUFFER, X, Y )  \
 503    ( (bgr_t *) ( (BUFFER)->ximage_origin3 - (Y) * (BUFFER)->ximage_width3 + 3 * (X) ))
 504
 505 #define PIXELADDR4( BUFFER, X, Y )  \
 506    ( (BUFFER)->ximage_origin4 - (Y) * (BUFFER)->ximage_width4 + (X) )
 507
 508
 509
 510 /*
 511  * External functions:
 512  */
 513
 514 extern unsigned long xmesa_color_to_pixel( XMesaContext xmesa,
 515                                   GLubyte r, GLubyte g, GLubyte b, GLubyte a );
 516
 517 extern void xmesa_alloc_back_buffer( XMesaBuffer b );
 518
 519 extern void xmesa_update_state( GLcontext *ctx );
 520
 521 extern points_func xmesa_get_points_func( GLcontext *ctx );
 522
 523 extern line_func xmesa_get_line_func( GLcontext *ctx );
 524
 525 extern triangle_func xmesa_get_triangle_func( GLcontext *ctx );
 526
 527
 528 /* XXX this is a hack to implement shared display lists with 3Dfx */
 529 extern XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v,
 530                                              XMesaWindow w,
 531                                              XMesaContext c
 532                                              DRI_DRAWABLE_ARG
 533                                            );
 534
 535 /*
 536  * These are the extra routines required for integration with XFree86.
 537  * None of these routines should be user visible. -KEM
 538  */
 539 extern void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v );
 540 extern GLboolean XMesaForceCurrent(XMesaContext c);
 541 extern GLboolean XMesaLoseCurrent(XMesaContext c);
 542 extern void XMesaReset( void );
 543
 544 #endif