src/mesa/drivers/x11/xmesaP.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #ifndef XMESAP_H
  27 #define XMESAP_H
  28
  29
  30 #ifdef XFree86Server
  31 # include "GL/xf86glx.h"
  32 # include "xf86glx_util.h"
  33 #elif defined(USE_XSHM)
  34 # include <X11/extensions/XShm.h>
  35 #endif
  36 #include "GL/xmesa.h"
  37 #include "mtypes.h"
  38 #if defined(FX)
  39 #include "GL/fxmesa.h"
  40 #include "../glide/fxdrv.h"
  41 #endif
  42
  43
  44 extern _glthread_Mutex _xmesa_lock;
  45
  46
  47 /* for PF_8R8G8B24 pixel format */
  48 typedef struct {
  49    GLubyte b;
  50    GLubyte g;
  51    GLubyte r;
  52 } bgr_t;
  53
  54
  55 /* Function pointer for clearing color buffers */
  56 typedef void (*clear_func)( GLcontext *ctx,
  57                             GLboolean all, GLint x, GLint y,
  58                             GLint width, GLint height );
  59
  60
  61
  62
  63 /** Framebuffer pixel formats */
  64 enum pixel_format {
  65    PF_Index,            /**< Color Index mode */
  66    PF_Truecolor,        /**< TrueColor or DirectColor, any depth */
  67    PF_Dither_True,      /**< TrueColor with dithering */
  68    PF_8A8B8G8R,         /**< 32-bit TrueColor:  8-A, 8-B, 8-G, 8-R */
  69    PF_8R8G8B,           /**< 32-bit TrueColor:  8-R, 8-G, 8-B bits */
  70    PF_5R6G5B,           /**< 16-bit TrueColor:  5-R, 6-G, 5-B bits */
  71    PF_Dither,           /**< Color-mapped RGB with dither */
  72    PF_Lookup,           /**< Color-mapped RGB without dither */
  73    PF_HPCR,             /**< HP Color Recovery (ad@lms.be 30/08/95) */
  74    PF_1Bit,             /**< monochrome dithering of RGB */
  75    PF_Grayscale,        /**< Grayscale or StaticGray */
  76    PF_8R8G8B24,         /**< 24-bit TrueColor: 8-R, 8-G, 8-B bits */
  77    PF_Dither_5R6G5B     /**< 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
  78 };
  79
  80
  81 /*
  82  * "Derived" from GLvisual.  Basically corresponds to an XVisualInfo.
  83  */
  84 struct xmesa_visual {
  85    GLvisual mesa_visual;        /* Device independent visual parameters */
  86    XMesaDisplay *display;       /* The X11 display */
  87 #ifdef XFree86Server
  88    GLint ColormapEntries;
  89    GLint nplanes;
  90 #else
  91    XMesaVisualInfo visinfo;     /* X's visual info (pointer to private copy) */
  92    XVisualInfo *vishandle;      /* Only used in fakeglx.c */
  93 #endif
  94    GLint BitsPerPixel;          /* True bits per pixel for XImages */
  95
  96    GLboolean ximage_flag;       /* Use XImage for back buffer (not pixmap)? */
  97
  98    enum pixel_format dithered_pf;  /* Pixel format when dithering */
  99    enum pixel_format undithered_pf;/* Pixel format when not dithering */
 100
 101    GLfloat RedGamma;            /* Gamma values, 1.0 is default */
 102    GLfloat GreenGamma;
 103    GLfloat BlueGamma;
 104
 105    /* For PF_TRUECOLOR */
 106    GLint rshift, gshift, bshift;/* Pixel color component shifts */
 107    GLubyte Kernel[16];          /* Dither kernel */
 108    unsigned long RtoPixel[512]; /* RGB to pixel conversion */
 109    unsigned long GtoPixel[512];
 110    unsigned long BtoPixel[512];
 111    GLubyte PixelToR[256];       /* Pixel to RGB conversion */
 112    GLubyte PixelToG[256];
 113    GLubyte PixelToB[256];
 114
 115    /* For PF_HPCR */
 116    short       hpcr_rgbTbl[3][256];
 117    GLboolean   hpcr_clear_flag;
 118    GLubyte     hpcr_clear_ximage_pattern[2][16];
 119    XMesaImage *hpcr_clear_ximage;
 120    XMesaPixmap hpcr_clear_pixmap;
 121
 122    /* For PF_1BIT */
 123    int bitFlip;
 124 };
 125
 126
 127 /*
 128  * "Derived" from __GLcontextRec.  Basically corresponds to a GLXContext.
 129  */
 130 struct xmesa_context {
 131    GLcontext mesa;              /* the core library context (containment) */
 132    XMesaVisual xm_visual;       /* Describes the buffers */
 133    XMesaBuffer xm_draw_buffer;  /* current draw framebuffer */
 134    XMesaBuffer xm_read_buffer;  /* current read framebuffer */
 135    XMesaBuffer xm_buffer;       /* current span/point/line/triangle buffer */
 136
 137    XMesaDisplay *display;       /* == xm_visual->display */
 138    GLboolean swapbytes;         /* Host byte order != display byte order? */
 139    GLboolean direct;            /* Direct rendering context? */
 140
 141    enum pixel_format pixelformat;
 142
 143    GLubyte clearcolor[4];               /* current clearing color */
 144    unsigned long clearpixel;            /* current clearing pixel value */
 145 };
 146
 147
 148
 149 typedef enum {
 150    WINDOW,          /* An X window */
 151    GLXWINDOW,       /* GLX window */
 152    PIXMAP,          /* GLX pixmap */
 153    PBUFFER          /* GLX Pbuffer */
 154 } BufferType;
 155
 156
 157 /*
 158  * "Derived" from GLframebuffer.  Basically corresponds to a GLXDrawable.
 159  */
 160 struct xmesa_buffer {
 161    GLframebuffer mesa_buffer;   /* depth, stencil, accum, etc buffers */
 162                                 /* This MUST BE FIRST! */
 163    GLboolean wasCurrent;        /* was ever the current buffer? */
 164    XMesaVisual xm_visual;       /* the X/Mesa visual */
 165
 166    XMesaDisplay *display;
 167    BufferType type;             /* window, pixmap, pbuffer or glxwindow */
 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    unsigned long selectedEvents;/* for pbuffers only */
 178
 179    GLint db_state;              /* 0 = single buffered */
 180                                 /* BACK_PIXMAP = use Pixmap for back buffer */
 181                                 /* BACK_XIMAGE = use XImage for back buffer */
 182
 183 #ifndef XFree86Server
 184    GLuint shm;                  /* X Shared Memory extension status:    */
 185                                 /*    0 = not available                 */
 186                                 /*    1 = XImage support available      */
 187                                 /*    2 = Pixmap support available too  */
 188 #ifdef USE_XSHM
 189    XShmSegmentInfo shminfo;
 190 #endif
 191 #endif
 192
 193    XMesaImage *rowimage;        /* Used for optimized span writing */
 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 gc;                  /* scratch GC for span, line, tri drawing */
 209    XMesaGC cleargc;             /* GC for clearing the color buffer */
 210    XMesaGC swapgc;              /* GC for swapping the color buffers */
 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 #if defined(XFree86Server)
 227    Pixel alloced_colors[256];
 228 #else
 229    unsigned long alloced_colors[256];
 230 #endif
 231
 232 #if defined( FX )
 233    /* For 3Dfx Glide only */
 234    GLboolean FXisHackUsable;    /* Can we render into window? */
 235    GLboolean FXwindowHack;      /* Are we rendering into a window? */
 236    fxMesaContext FXctx;
 237 #endif
 238
 239    /* functions for clearing the front and back color buffers */
 240    clear_func front_clear_func;
 241    clear_func back_clear_func;
 242
 243    struct xmesa_buffer *Next;   /* Linked list pointer: */
 244 };
 245
 246
 247
 248 /* Values for xmesa->dest: */
 249 #define FRONT_PIXMAP    1
 250 #define BACK_PIXMAP     2
 251 #define BACK_XIMAGE     4
 252
 253 /* Special value for X Drawable variables to indicate use of XImage instead */
 254 #define XIMAGE None
 255
 256
 257 /*
 258  * If pixelformat==PF_TRUECOLOR:
 259  */
 260 #define PACK_TRUECOLOR( PIXEL, R, G, B )        \
 261    PIXEL = xmesa->xm_visual->RtoPixel[R]        \
 262          | xmesa->xm_visual->GtoPixel[G]        \
 263          | xmesa->xm_visual->BtoPixel[B];       \
 264
 265
 266 /*
 267  * If pixelformat==PF_TRUEDITHER:
 268  */
 269 #define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B )                 \
 270 {                                                               \
 271    int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)];    \
 272    PIXEL = xmesa->xm_visual->RtoPixel[(R)+d]                    \
 273          | xmesa->xm_visual->GtoPixel[(G)+d]                    \
 274          | xmesa->xm_visual->BtoPixel[(B)+d];                   \
 275 }
 276
 277
 278
 279 /*
 280  * If pixelformat==PF_8A8B8G8R:
 281  */
 282 #define PACK_8A8B8G8R( R, G, B, A )     \
 283         ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
 284
 285
 286 /*
 287  * Like PACK_8A8B8G8R() but don't use alpha.  This is usually an acceptable
 288  * shortcut.
 289  */
 290 #define PACK_8B8G8R( R, G, B )   ( ((B) << 16) | ((G) << 8) | (R) )
 291
 292
 293
 294 /*
 295  * If pixelformat==PF_8R8G8B:
 296  */
 297 #define PACK_8R8G8B( R, G, B)    ( ((R) << 16) | ((G) << 8) | (B) )
 298
 299
 300 /*
 301  * If pixelformat==PF_5R6G5B:
 302  */
 303 #define PACK_5R6G5B( R, G, B)    ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
 304
 305
 306
 307
 308 /*
 309  * If pixelformat==PF_DITHER:
 310  *
 311  * Improved 8-bit RGB dithering code contributed by Bob Mercier
 312  * (mercier@hollywood.cinenet.net).  Thanks Bob!
 313  */
 314 #ifdef DITHER666
 315 # define DITH_R   6
 316 # define DITH_G   6
 317 # define DITH_B   6
 318 # define DITH_MIX(r,g,b)  (((r) * DITH_G + (g)) * DITH_B + (b))
 319 #else
 320 # define DITH_R 5
 321 # define DITH_G 9
 322 # define DITH_B 5
 323 # define DITH_MIX(r,g,b)  (((g) << 6) | ((b) << 3) | (r))
 324 #endif
 325 #define DITH_DX 4
 326 #define DITH_DY 4
 327 #define DITH_N  (DITH_DX * DITH_DY)
 328
 329 #define _dither(C, c, d)   (((unsigned)((DITH_N * (C - 1) + 1) * c + d)) >> 12)
 330
 331 #define MAXC    256
 332 extern const int xmesa_kernel8[DITH_DY * DITH_DX];
 333
 334 /* Dither for random X,Y */
 335 #define DITHER_SETUP                                            \
 336         int __d;                                                \
 337         unsigned long *ctable = xmesa->xm_buffer->color_table;
 338
 339 #define DITHER( X, Y, R, G, B )                         \
 340         (__d = xmesa_kernel8[(((Y)&3)<<2) | ((X)&3)],   \
 341          ctable[DITH_MIX(_dither(DITH_R, (R), __d),     \
 342                          _dither(DITH_G, (G), __d),     \
 343                          _dither(DITH_B, (B), __d))])
 344
 345 /* Dither for random X, fixed Y */
 346 #define XDITHER_SETUP(Y)                                        \
 347         int __d;                                                \
 348         unsigned long *ctable = xmesa->xm_buffer->color_table;  \
 349         const int *kernel = &xmesa_kernel8[ ((Y)&3) << 2 ];
 350
 351 #define XDITHER( X, R, G, B )                           \
 352         (__d = kernel[(X)&3],                           \
 353         ctable[DITH_MIX(_dither(DITH_R, (R), __d),      \
 354                         _dither(DITH_G, (G), __d),      \
 355                         _dither(DITH_B, (B), __d))])
 356
 357
 358
 359 /*
 360  * Dithering for flat-shaded triangles.  Precompute all 16 possible
 361  * pixel values given the triangle's RGB color.  Contributed by Martin Shenk.
 362  */
 363 #define FLAT_DITHER_SETUP( R, G, B )                                    \
 364         GLushort ditherValues[16];                                      \
 365         {                                                               \
 366            unsigned long *ctable = xmesa->xm_buffer->color_table;       \
 367            int msdr = (DITH_N*((DITH_R)-1)+1) * (R);                    \
 368            int msdg = (DITH_N*((DITH_G)-1)+1) * (G);                    \
 369            int msdb = (DITH_N*((DITH_B)-1)+1) * (B);                    \
 370            int i;                                                       \
 371            for (i=0;i<16;i++) {                                         \
 372               int k = xmesa_kernel8[i];                                 \
 373               int j = DITH_MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 );\
 374               ditherValues[i] = (GLushort) ctable[j];                   \
 375            }                                                            \
 376         }
 377
 378 #define FLAT_DITHER_ROW_SETUP(Y)                                        \
 379         GLushort *ditherRow = ditherValues + ( ((Y)&3) << 2);
 380
 381 #define FLAT_DITHER(X)  ditherRow[(X)&3]
 382
 383
 384
 385 /*
 386  * If pixelformat==PF_LOOKUP:
 387  */
 388 #define _dither_lookup(C, c)   (((unsigned)((DITH_N * (C - 1) + 1) * c)) >> 12)
 389
 390 #define LOOKUP_SETUP                                            \
 391         unsigned long *ctable = xmesa->xm_buffer->color_table
 392
 393 #define LOOKUP( R, G, B )                               \
 394         ctable[DITH_MIX(_dither_lookup(DITH_R, (R)),    \
 395                         _dither_lookup(DITH_G, (G)),    \
 396                         _dither_lookup(DITH_B, (B)))]
 397
 398
 399
 400 /*
 401  * If pixelformat==PF_HPCR:
 402  *
 403  *      HP Color Recovery dithering               (ad@lms.be 30/08/95)
 404  *      HP has on it's 8-bit 700-series computers, a feature called
 405  *      'Color Recovery'.  This allows near 24-bit output (so they say).
 406  *      It is enabled by selecting the 8-bit  TrueColor  visual AND
 407  *      corresponding  colormap (see tkInitWindow) AND doing some special
 408  *      dither.
 409  */
 410 extern const short xmesa_HPCR_DRGB[3][2][16];
 411
 412 #define DITHER_HPCR( X, Y, R, G, B )                                       \
 413   ( ((xmesa->xm_visual->hpcr_rgbTbl[0][R] + xmesa_HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0)     \
 414   |(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + xmesa_HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
 415   | ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + xmesa_HPCR_DRGB[2][(Y)&1][(X)&15])>>6)         \
 416   )
 417
 418
 419
 420 /*
 421  * If pixelformat==PF_1BIT:
 422  */
 423 extern const int xmesa_kernel1[16];
 424
 425 #define SETUP_1BIT  int bitFlip = xmesa->xm_visual->bitFlip
 426 #define DITHER_1BIT( X, Y, R, G, B )    \
 427         (( ((int)(R)+(int)(G)+(int)(B)) > xmesa_kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
 428
 429
 430
 431 /*
 432  * If pixelformat==PF_GRAYSCALE:
 433  */
 434 #define GRAY_RGB( R, G, B )   xmesa->xm_buffer->color_table[((R) + (G) + (B))/3]
 435
 436
 437
 438 /*
 439  * Converts a GL window Y coord to an X window Y coord:
 440  */
 441 #define FLIP(BUFFER, Y)  ((BUFFER)->bottom-(Y))
 442
 443
 444 /*
 445  * Return the address of a 1, 2 or 4-byte pixel in the back XImage:
 446  * X==0 is left, Y==0 is bottom.
 447  */
 448 #define PIXELADDR1( BUFFER, X, Y )  \
 449    ( (BUFFER)->ximage_origin1 - (Y) * (BUFFER)->ximage_width1 + (X) )
 450
 451 #define PIXELADDR2( BUFFER, X, Y )  \
 452    ( (BUFFER)->ximage_origin2 - (Y) * (BUFFER)->ximage_width2 + (X) )
 453
 454 #define PIXELADDR3( BUFFER, X, Y )  \
 455    ( (bgr_t *) ( (BUFFER)->ximage_origin3 - (Y) * (BUFFER)->ximage_width3 + 3 * (X) ))
 456
 457 #define PIXELADDR4( BUFFER, X, Y )  \
 458    ( (BUFFER)->ximage_origin4 - (Y) * (BUFFER)->ximage_width4 + (X) )
 459
 460
 461
 462
 463 /*
 464  * Return pointer to XMesaContext corresponding to a Mesa GLcontext.
 465  * Since we're using structure containment, it's just a cast!.
 466  */
 467 #define XMESA_CONTEXT(MESACTX)  (XMesaContext) (MESACTX)
 468
 469
 470
 471 /*
 472  * External functions:
 473  */
 474
 475 extern unsigned long
 476 xmesa_color_to_pixel( XMesaContext xmesa,
 477                       GLubyte r, GLubyte g, GLubyte b, GLubyte a,
 478                       GLuint pixelFormat );
 479
 480 extern void xmesa_alloc_back_buffer( XMesaBuffer b );
 481
 482 extern void xmesa_resize_buffers( GLframebuffer *buffer );
 483
 484 extern void xmesa_init_driver_functions( XMesaVisual xmvisual,
 485                                          struct dd_function_table *driver );
 486
 487 extern void xmesa_update_state( GLcontext *ctx, GLuint new_state );
 488
 489 extern void xmesa_update_span_funcs( GLcontext *ctx );
 490
 491 extern void xmesa_set_buffer( GLcontext *ctx, GLframebuffer *buffer,
 492                               GLuint bufferBit );
 493
 494
 495 /* Plugged into the software rasterizer.  Try to use internal
 496  * swrast-style point, line and triangle functions.
 497  */
 498 extern void xmesa_choose_point( GLcontext *ctx );
 499 extern void xmesa_choose_line( GLcontext *ctx );
 500 extern void xmesa_choose_triangle( GLcontext *ctx );
 501
 502
 503 extern void xmesa_register_swrast_functions( GLcontext *ctx );
 504
 505
 506
 507 /* XXX this is a hack to implement shared display lists with 3Dfx */
 508 extern XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v,
 509                                              XMesaWindow w,
 510                                              XMesaContext c );
 511
 512 /*
 513  * These are the extra routines required for integration with XFree86.
 514  * None of these routines should be user visible. -KEM
 515  */
 516 extern void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v );
 517 extern GLboolean XMesaForceCurrent(XMesaContext c);
 518 extern GLboolean XMesaLoseCurrent(XMesaContext c);
 519 extern void XMesaReset( void );
 520
 521
 522 #define SWTC 0 /* SW texture compression */
 523
 524
 525 #endif