src/mesa/main/dd.h

   1 /* $Id: dd.h,v 1.43 2000/11/24 10:25:05 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   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
  29 #ifndef DD_INCLUDED
  30 #define DD_INCLUDED
  31
  32 /* THIS FILE ONLY INCLUDED BY mtypes.h !!!!! */
  33
  34
  35 struct gl_pixelstore_attrib;
  36 struct vertex_buffer;
  37 struct gl_pipeline;
  38 struct gl_pipeline_stage;
  39
  40
  41
  42 /*
  43  *                      Device Driver (DD) interface
  44  *
  45  *
  46  * All device driver functions are accessed through pointers in the
  47  * dd_function_table struct (defined below) which is stored in the GLcontext
  48  * struct.  Since the device driver is strictly accessed trough a table of
  49  * function pointers we can:
  50  *   1. switch between a number of different device drivers at runtime.
  51  *   2. use optimized functions dependant on current rendering state or
  52  *      frame buffer configuration.
  53  *
  54  * The function pointers in the dd_function_table struct are divided into
  55  * two groups:  mandatory and optional.
  56  * Mandatory functions have to be implemented by every device driver.
  57  * Optional functions may or may not be implemented by the device driver.
  58  * The optional functions provide ways to take advantage of special hardware
  59  * or optimized algorithms.
  60  *
  61  * The function pointers in the dd_function_table struct should first be
  62  * initialized in the driver's "MakeCurrent" function.  The "MakeCurrent"
  63  * function is a little different in each device driver.  See the X/Mesa,
  64  * GLX, or OS/Mesa drivers for examples.
  65  *
  66  * Later, Mesa may call the dd_function_table's UpdateState() function.
  67  * This function should initialize the dd_function_table's pointers again.
  68  * The UpdateState() function is called whenever the core (GL) rendering
  69  * state is changed in a way which may effect rasterization.  For example,
  70  * the TriangleFunc() pointer may have to point to different functions
  71  * depending on whether smooth or flat shading is enabled.
  72  *
  73  * Note that the first argument to every device driver function is a
  74  * GLcontext *.  In turn, the GLcontext->DriverCtx pointer points to
  75  * the driver-specific context struct.  See the X/Mesa or OS/Mesa interface
  76  * for an example.
  77  *
  78  * For more information about writing a device driver see the ddsample.c
  79  * file and other device drivers (X/xmesa[1234].c, OSMesa/osmesa.c, etc)
  80  * for examples.
  81  *
  82  *
  83  * Look below in the dd_function_table struct definition for descriptions
  84  * of each device driver function.
  85  *
  86  *
  87  * In the future more function pointers may be added for glReadPixels
  88  * glCopyPixels, etc.
  89  *
  90  *
  91  * Notes:
  92  * ------
  93  *   RGBA = red/green/blue/alpha
  94  *   CI = color index (color mapped mode)
  95  *   mono = all pixels have the same color or index
  96  *
  97  *   The write_ functions all take an array of mask flags which indicate
  98  *   whether or not the pixel should be written.  One special case exists
  99  *   in the write_color_span function: if the mask array is NULL, then
 100  *   draw all pixels.  This is an optimization used for glDrawPixels().
 101  *
 102  * IN ALL CASES:
 103  *      X coordinates start at 0 at the left and increase to the right
 104  *      Y coordinates start at 0 at the bottom and increase upward
 105  *
 106  */
 107
 108
 109
 110
 111
 112
 113 /* Mask bits sent to the driver Clear() function */
 114 #define DD_FRONT_LEFT_BIT  FRONT_LEFT_BIT         /* 1 */
 115 #define DD_FRONT_RIGHT_BIT FRONT_RIGHT_BIT        /* 2 */
 116 #define DD_BACK_LEFT_BIT   BACK_LEFT_BIT          /* 4 */
 117 #define DD_BACK_RIGHT_BIT  BACK_RIGHT_BIT         /* 8 */
 118 #define DD_DEPTH_BIT       GL_DEPTH_BUFFER_BIT    /* 0x00000100 */
 119 #define DD_STENCIL_BIT     GL_STENCIL_BUFFER_BIT  /* 0x00000400 */
 120 #define DD_ACCUM_BIT       GL_ACCUM_BUFFER_BIT    /* 0x00000200 */
 121
 122
 123
 124
 125
 126
 127
 128 /* Point, line, triangle, quadrilateral and rectangle rasterizer
 129  * functions.  These are specific to the tnl module and will shortly
 130  * move to a driver interface specific to that module.
 131  */
 132 typedef void (*points_func)( GLcontext *ctx, GLuint first, GLuint last );
 133
 134 typedef void (*line_func)( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv );
 135
 136 typedef void (*triangle_func)( GLcontext *ctx,
 137                                GLuint v1, GLuint v2, GLuint v3, GLuint pv );
 138
 139 typedef void (*quad_func)( GLcontext *ctx, GLuint v1, GLuint v2,
 140                            GLuint v3, GLuint v4, GLuint pv );
 141
 142 typedef void (*render_func)( struct vertex_buffer *VB,
 143                              GLuint start,
 144                              GLuint count,
 145                              GLuint parity );
 146
 147
 148 /*
 149  * Device Driver function table.
 150  */
 151 struct dd_function_table {
 152
 153    /**********************************************************************
 154     *** Mandatory functions:  these functions must be implemented by   ***
 155     *** every device driver.                                           ***
 156     **********************************************************************/
 157
 158    const GLubyte * (*GetString)( GLcontext *ctx, GLenum name );
 159    /* Return a string as needed by glGetString().
 160     * Only the GL_RENDERER token must be implemented.  Otherwise,
 161     * NULL can be returned.
 162     */
 163
 164    void (*UpdateState)( GLcontext *ctx );
 165    /*
 166     * UpdateState() is called whenver Mesa thinks the device driver should
 167     * update its state and/or the other pointers (such as PointsFunc,
 168     * LineFunc, or TriangleFunc).
 169     */
 170
 171    void (*ClearIndex)( GLcontext *ctx, GLuint index );
 172    /*
 173     * Called whenever glClearIndex() is called.  Set the index for clearing
 174     * the color buffer when in color index mode.
 175     */
 176
 177    void (*ClearColor)( GLcontext *ctx, GLchan red, GLchan green,
 178                                         GLchan blue, GLchan alpha );
 179    /*
 180     * Called whenever glClearColor() is called.  Set the color for clearing
 181     * the color buffer when in RGBA mode.
 182     */
 183
 184    GLbitfield (*Clear)( GLcontext *ctx, GLbitfield mask, GLboolean all,
 185                         GLint x, GLint y, GLint width, GLint height );
 186    /* Clear the color/depth/stencil/accum buffer(s).
 187     * 'mask' is a bitmask of the DD_*_BIT values defined above that indicates
 188     * which buffers need to be cleared.  The driver should clear those
 189     * buffers then return a new bitmask indicating which buffers should be
 190     * cleared by software Mesa.
 191     * If 'all' is true then the clear the whole buffer, else clear only the
 192     * region defined by (x,y,width,height).
 193     * This function must obey the glColorMask, glIndexMask and glStencilMask
 194     * settings!  Software Mesa can do masked clears if the device driver can't.
 195     */
 196
 197    GLboolean (*SetDrawBuffer)( GLcontext *ctx, GLenum buffer );
 198    /*
 199     * Specifies the current buffer for writing.
 200     * The following values must be accepted when applicable:
 201     *    GL_FRONT_LEFT - this buffer always exists
 202     *    GL_BACK_LEFT - when double buffering
 203     *    GL_FRONT_RIGHT - when using stereo
 204     *    GL_BACK_RIGHT - when using stereo and double buffering
 205     * The folowing values may optionally be accepted.  Return GL_TRUE
 206     * if accepted, GL_FALSE if not accepted.  In practice, only drivers
 207     * which can write to multiple color buffers at once should accept
 208     * these values.
 209     *    GL_FRONT - write to front left and front right if it exists
 210     *    GL_BACK - write to back left and back right if it exists
 211     *    GL_LEFT - write to front left and back left if it exists
 212     *    GL_RIGHT - write to right left and back right if they exist
 213     *    GL_FRONT_AND_BACK - write to all four buffers if they exist
 214     *    GL_NONE - disable buffer write in device driver.
 215     */
 216
 217    void (*SetReadBuffer)( GLcontext *ctx, GLframebuffer *colorBuffer,
 218                           GLenum buffer );
 219    /*
 220     * Specifies the current buffer for reading.
 221     * colorBuffer will be one of:
 222     *    GL_FRONT_LEFT - this buffer always exists
 223     *    GL_BACK_LEFT - when double buffering
 224     *    GL_FRONT_RIGHT - when using stereo
 225     *    GL_BACK_RIGHT - when using stereo and double buffering
 226     */
 227
 228    void (*GetBufferSize)( GLcontext *ctx, GLuint *width, GLuint *height );
 229    /*
 230     * Returns the width and height of the current color buffer.
 231     */
 232
 233
 234    /***
 235     *** Functions for writing pixels to the frame buffer:
 236     ***/
 237
 238    void (*WriteRGBASpan)( const GLcontext *ctx,
 239                           GLuint n, GLint x, GLint y,
 240                           CONST GLchan rgba[][4], const GLubyte mask[] );
 241    void (*WriteRGBSpan)( const GLcontext *ctx,
 242                          GLuint n, GLint x, GLint y,
 243                          CONST GLchan rgb[][3], const GLubyte mask[] );
 244    /* Write a horizontal run of RGBA or RGB pixels.
 245     * If mask is NULL, draw all pixels.
 246     * If mask is not null, only draw pixel [i] when mask [i] is true.
 247     */
 248
 249    void (*WriteMonoRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 250                               const GLchan color[4], const GLubyte mask[] );
 251    /* Write a horizontal run of RGBA pixels all with the same color.
 252     */
 253
 254    void (*WriteRGBAPixels)( const GLcontext *ctx,
 255                             GLuint n, const GLint x[], const GLint y[],
 256                             CONST GLchan rgba[][4], const GLubyte mask[] );
 257    /* Write array of RGBA pixels at random locations.
 258     */
 259
 260    void (*WriteMonoRGBAPixels)( const GLcontext *ctx,
 261                                 GLuint n, const GLint x[], const GLint y[],
 262                                 const GLchan color[4], const GLubyte mask[] );
 263    /* Write an array of mono-RGBA pixels at random locations.
 264     */
 265
 266    void (*WriteCI32Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 267                           const GLuint index[], const GLubyte mask[] );
 268    void (*WriteCI8Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 269                          const GLubyte index[], const GLubyte mask[] );
 270    /* Write a horizontal run of CI pixels.  One function is for 32bpp
 271     * indexes and the other for 8bpp pixels (the common case).  You mus
 272     * implement both for color index mode.
 273     */
 274
 275    void (*WriteMonoCISpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 276                             GLuint colorIndex, const GLubyte mask[] );
 277    /* Write a horizontal run of color index pixels using the color index
 278     * last specified by the Index() function.
 279     */
 280
 281    void (*WriteCI32Pixels)( const GLcontext *ctx,
 282                             GLuint n, const GLint x[], const GLint y[],
 283                             const GLuint index[], const GLubyte mask[] );
 284    /*
 285     * Write a random array of CI pixels.
 286     */
 287
 288    void (*WriteMonoCIPixels)( const GLcontext *ctx,
 289                               GLuint n, const GLint x[], const GLint y[],
 290                               GLuint colorIndex, const GLubyte mask[] );
 291    /* Write a random array of color index pixels using the color index
 292     * last specified by the Index() function.
 293     */
 294
 295
 296    /***
 297     *** Functions to read pixels from frame buffer:
 298     ***/
 299
 300    void (*ReadCI32Span)( const GLcontext *ctx,
 301                          GLuint n, GLint x, GLint y, GLuint index[] );
 302    /* Read a horizontal run of color index pixels.
 303     */
 304
 305    void (*ReadRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 306                          GLchan rgba[][4] );
 307    /* Read a horizontal run of RGBA pixels.
 308     */
 309
 310    void (*ReadCI32Pixels)( const GLcontext *ctx,
 311                            GLuint n, const GLint x[], const GLint y[],
 312                            GLuint indx[], const GLubyte mask[] );
 313    /* Read a random array of CI pixels.
 314     */
 315
 316    void (*ReadRGBAPixels)( const GLcontext *ctx,
 317                            GLuint n, const GLint x[], const GLint y[],
 318                            GLchan rgba[][4], const GLubyte mask[] );
 319    /* Read a random array of RGBA pixels.
 320     */
 321
 322
 323    /**********************************************************************
 324     *** Optional functions:  these functions may or may not be         ***
 325     *** implemented by the device driver.  If the device driver        ***
 326     *** doesn't implement them it should never touch these pointers    ***
 327     *** since Mesa will either set them to NULL or point them at a     ***
 328     *** fall-back function.                                            ***
 329     **********************************************************************/
 330
 331    void (*Finish)( GLcontext *ctx );
 332    /*
 333     * This is called whenever glFinish() is called.
 334     */
 335
 336    void (*Flush)( GLcontext *ctx );
 337    /*
 338     * This is called whenever glFlush() is called.
 339     */
 340
 341    void (*Error)( GLcontext *ctx );
 342    /*
 343     * Called whenever an error is generated.  ctx->ErrorValue contains
 344     * the error value.
 345     */
 346
 347
 348    /***
 349     *** For supporting hardware Z buffers:
 350     *** Either ALL or NONE of these functions must be implemented!
 351     *** NOTE that Each depth value is a 32-bit GLuint.  If the depth
 352     *** buffer is less than 32 bits deep then the extra upperbits are zero.
 353     ***/
 354
 355    void (*WriteDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 356                            const GLdepth depth[], const GLubyte mask[] );
 357    /* Write a horizontal span of values into the depth buffer.  Only write
 358     * depth[i] value if mask[i] is nonzero.
 359     */
 360
 361    void (*ReadDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 362                           GLdepth depth[] );
 363    /* Read a horizontal span of values from the depth buffer.
 364     */
 365
 366
 367    void (*WriteDepthPixels)( GLcontext *ctx, GLuint n,
 368                              const GLint x[], const GLint y[],
 369                              const GLdepth depth[], const GLubyte mask[] );
 370    /* Write an array of randomly positioned depth values into the
 371     * depth buffer.  Only write depth[i] value if mask[i] is nonzero.
 372     */
 373
 374    void (*ReadDepthPixels)( GLcontext *ctx, GLuint n,
 375                             const GLint x[], const GLint y[],
 376                             GLdepth depth[] );
 377    /* Read an array of randomly positioned depth values from the depth buffer.
 378     */
 379
 380
 381
 382    /***
 383     *** For supporting hardware stencil buffers:
 384     *** Either ALL or NONE of these functions must be implemented!
 385     ***/
 386
 387    void (*WriteStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 388                              const GLstencil stencil[], const GLubyte mask[] );
 389    /* Write a horizontal span of stencil values into the stencil buffer.
 390     * If mask is NULL, write all stencil values.
 391     * Else, only write stencil[i] if mask[i] is non-zero.
 392     */
 393
 394    void (*ReadStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 395                             GLstencil stencil[] );
 396    /* Read a horizontal span of stencil values from the stencil buffer.
 397     */
 398
 399    void (*WriteStencilPixels)( GLcontext *ctx, GLuint n,
 400                                const GLint x[], const GLint y[],
 401                                const GLstencil stencil[],
 402                                const GLubyte mask[] );
 403    /* Write an array of stencil values into the stencil buffer.
 404     * If mask is NULL, write all stencil values.
 405     * Else, only write stencil[i] if mask[i] is non-zero.
 406     */
 407
 408    void (*ReadStencilPixels)( GLcontext *ctx, GLuint n,
 409                               const GLint x[], const GLint y[],
 410                               GLstencil stencil[] );
 411    /* Read an array of stencil values from the stencil buffer.
 412     */
 413
 414
 415    /***
 416     *** glDraw/Read/CopyPixels and glBitmap functions:
 417     ***/
 418
 419    GLboolean (*DrawPixels)( GLcontext *ctx,
 420                             GLint x, GLint y, GLsizei width, GLsizei height,
 421                             GLenum format, GLenum type,
 422                             const struct gl_pixelstore_attrib *unpack,
 423                             const GLvoid *pixels );
 424    /* This is called by glDrawPixels.
 425     * 'unpack' describes how to unpack the source image data.
 426     * Return GL_TRUE if the driver succeeds, return GL_FALSE if core Mesa
 427     * must do the job.
 428     */
 429
 430    GLboolean (*ReadPixels)( GLcontext *ctx,
 431                             GLint x, GLint y, GLsizei width, GLsizei height,
 432                             GLenum format, GLenum type,
 433                             const struct gl_pixelstore_attrib *unpack,
 434                             GLvoid *dest );
 435    /* Called by glReadPixels.
 436     * Return GL_TRUE if operation completed, else return GL_FALSE.
 437     * This function must respect all glPixelTransfer settings.
 438     */
 439
 440    GLboolean (*CopyPixels)( GLcontext *ctx,
 441                             GLint srcx, GLint srcy,
 442                             GLsizei width, GLsizei height,
 443                             GLint dstx, GLint dsty, GLenum type );
 444    /* Do a glCopyPixels.  Return GL_TRUE if operation completed, else
 445     * return GL_FALSE.  This function must respect all rasterization
 446     * state, glPixelTransfer, glPixelZoom, etc.
 447     */
 448
 449    GLboolean (*Bitmap)( GLcontext *ctx,
 450                         GLint x, GLint y, GLsizei width, GLsizei height,
 451                         const struct gl_pixelstore_attrib *unpack,
 452                         const GLubyte *bitmap );
 453    /* This is called by glBitmap.  Works the same as DrawPixels, above.
 454     */
 455
 456    GLboolean (*Accum)( GLcontext *ctx, GLenum op,
 457                        GLfloat value, GLint xpos, GLint ypos,
 458                        GLint width, GLint height );
 459    /* Hardware accum buffer.
 460     */
 461
 462    /***
 463     *** Texture mapping functions:
 464     ***/
 465
 466    GLboolean (*TexImage1D)( GLcontext *ctx, GLenum target, GLint level,
 467                             GLenum format, GLenum type, const GLvoid *pixels,
 468                             const struct gl_pixelstore_attrib *packing,
 469                             struct gl_texture_object *texObj,
 470                             struct gl_texture_image *texImage,
 471                             GLboolean *retainInternalCopy );
 472    GLboolean (*TexImage2D)( GLcontext *ctx, GLenum target, GLint level,
 473                             GLenum format, GLenum type, const GLvoid *pixels,
 474                             const struct gl_pixelstore_attrib *packing,
 475                             struct gl_texture_object *texObj,
 476                             struct gl_texture_image *texImage,
 477                             GLboolean *retainInternalCopy );
 478    GLboolean (*TexImage3D)( GLcontext *ctx, GLenum target, GLint level,
 479                             GLenum format, GLenum type, const GLvoid *pixels,
 480                             const struct gl_pixelstore_attrib *packing,
 481                             struct gl_texture_object *texObj,
 482                             struct gl_texture_image *texImage,
 483                             GLboolean *retainInternalCopy );
 484    /* Called by glTexImage1/2/3D.
 485     * Will not be called if any glPixelTransfer operations are enabled.
 486     * Arguments:
 487     *   <target>, <level>, <format>, <type> and <pixels> are user specified.
 488     *   <packing> indicates the image packing of pixels.
 489     *   <texObj> is the target texture object.
 490     *   <texImage> is the target texture image.  It will have the texture
 491     *      width, height, depth, border and internalFormat information.
 492     *   <retainInternalCopy> is returned by this function and indicates whether
 493     *      core Mesa should keep an internal copy of the texture image.
 494     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 495     * should do the job.  If GL_FALSE is returned, this function will be
 496     * called a second time after the texture image has been unpacked into
 497     * GLubytes.  It may be easier for the driver to handle then.
 498     */
 499
 500    GLboolean (*TexSubImage1D)( GLcontext *ctx, GLenum target, GLint level,
 501                                GLint xoffset, GLsizei width,
 502                                GLenum format, GLenum type,
 503                                const GLvoid *pixels,
 504                                const struct gl_pixelstore_attrib *packing,
 505                                struct gl_texture_object *texObj,
 506                                struct gl_texture_image *texImage );
 507    GLboolean (*TexSubImage2D)( GLcontext *ctx, GLenum target, GLint level,
 508                                GLint xoffset, GLint yoffset,
 509                                GLsizei width, GLsizei height,
 510                                GLenum format, GLenum type,
 511                                const GLvoid *pixels,
 512                                const struct gl_pixelstore_attrib *packing,
 513                                struct gl_texture_object *texObj,
 514                                struct gl_texture_image *texImage );
 515    GLboolean (*TexSubImage3D)( GLcontext *ctx, GLenum target, GLint level,
 516                                GLint xoffset, GLint yoffset, GLint zoffset,
 517                                GLsizei width, GLsizei height, GLint depth,
 518                                GLenum format, GLenum type,
 519                                const GLvoid *pixels,
 520                                const struct gl_pixelstore_attrib *packing,
 521                                struct gl_texture_object *texObj,
 522                                struct gl_texture_image *texImage );
 523    /* Called by glTexSubImage1/2/3D.
 524     * Will not be called if any glPixelTransfer operations are enabled.
 525     * Arguments:
 526     *   <target>, <level>, <xoffset>, <yoffset>, <zoffset>, <width>, <height>,
 527     *      <depth>, <format>, <type> and <pixels> are user specified.
 528     *   <packing> indicates the image packing of pixels.
 529     *   <texObj> is the target texture object.
 530     *   <texImage> is the target texture image.  It will have the texture
 531     *      width, height, border and internalFormat information.
 532     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 533     * should do the job.  If GL_FALSE is returned, then TexImage1/2/3D will
 534     * be called with the complete texture image.
 535     */
 536
 537    GLboolean (*CopyTexImage1D)( GLcontext *ctx, GLenum target, GLint level,
 538                                 GLenum internalFormat, GLint x, GLint y,
 539                                 GLsizei width, GLint border );
 540    GLboolean (*CopyTexImage2D)( GLcontext *ctx, GLenum target, GLint level,
 541                                 GLenum internalFormat, GLint x, GLint y,
 542                                 GLsizei width, GLsizei height, GLint border );
 543    /* Called by glCopyTexImage1D and glCopyTexImage2D.
 544     * Will not be called if any glPixelTransfer operations are enabled.
 545     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 546     * should do the job.
 547     */
 548
 549    GLboolean (*CopyTexSubImage1D)( GLcontext *ctx, GLenum target, GLint level,
 550                                    GLint xoffset,
 551                                    GLint x, GLint y, GLsizei width );
 552    GLboolean (*CopyTexSubImage2D)( GLcontext *ctx, GLenum target, GLint level,
 553                                    GLint xoffset, GLint yoffset,
 554                                    GLint x, GLint y,
 555                                    GLsizei width, GLsizei height );
 556    GLboolean (*CopyTexSubImage3D)( GLcontext *ctx, GLenum target, GLint level,
 557                                    GLint xoffset, GLint yoffset, GLint zoffset,
 558                                    GLint x, GLint y,
 559                                    GLsizei width, GLsizei height );
 560    /* Called by glCopyTexSubImage1/2/3D.
 561     * Will not be called if any glPixelTransfer operations are enabled.
 562     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 563     * should do the job.
 564     */
 565
 566    GLvoid *(*GetTexImage)( GLcontext *ctx, GLenum target, GLint level,
 567                            const struct gl_texture_object *texObj,
 568                            GLenum *formatOut, GLenum *typeOut,
 569                            GLboolean *freeImageOut );
 570    /* Called by glGetTexImage or by core Mesa when a texture image
 571     * is needed for software fallback rendering.
 572     * Return the address of the texture image or NULL if failure.
 573     * The image must be tightly packed (i.e. row stride = image width)
 574     * Return the image's format and type in formatOut and typeOut.
 575     * The format and type must be values which are accepted by glTexImage.
 576     * Set the freeImageOut flag if the returned image should be deallocated
 577     * with FREE() when finished.
 578     * The size of the image can be deduced from the target and level.
 579     * Core Mesa will perform any image format/type conversions that are needed.
 580     */
 581
 582    GLboolean (*TestProxyTexImage)(GLcontext *ctx, GLenum target,
 583                                   GLint level, GLint internalFormat,
 584                                   GLenum format, GLenum type,
 585                                   GLint width, GLint height,
 586                                   GLint depth, GLint border);
 587    /* Called by glTexImage[123]D when user specifies a proxy texture
 588     * target.  Return GL_TRUE if the proxy test passes, return GL_FALSE
 589     * if the test fails.
 590     */
 591
 592    GLboolean (*CompressedTexImage1D)( GLcontext *ctx, GLenum target,
 593                                       GLint level, GLsizei imageSize,
 594                                       const GLvoid *data,
 595                                       struct gl_texture_object *texObj,
 596                                       struct gl_texture_image *texImage,
 597                                       GLboolean *retainInternalCopy);
 598    GLboolean (*CompressedTexImage2D)( GLcontext *ctx, GLenum target,
 599                                       GLint level, GLsizei imageSize,
 600                                       const GLvoid *data,
 601                                       struct gl_texture_object *texObj,
 602                                       struct gl_texture_image *texImage,
 603                                       GLboolean *retainInternalCopy);
 604    GLboolean (*CompressedTexImage3D)( GLcontext *ctx, GLenum target,
 605                                       GLint level, GLsizei imageSize,
 606                                       const GLvoid *data,
 607                                       struct gl_texture_object *texObj,
 608                                       struct gl_texture_image *texImage,
 609                                       GLboolean *retainInternalCopy);
 610    /* Called by glCompressedTexImage1/2/3D.
 611     * Arguments:
 612     *   <target>, <level>, <internalFormat>, <data> are user specified.
 613     *   <texObj> is the target texture object.
 614     *   <texImage> is the target texture image.  It will have the texture
 615     *      width, height, depth, border and internalFormat information.
 616     *   <retainInternalCopy> is returned by this function and indicates whether
 617     *      core Mesa should keep an internal copy of the texture image.
 618     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 619     * should do the job.
 620     */
 621
 622    GLboolean (*CompressedTexSubImage1D)( GLcontext *ctx, GLenum target,
 623                                          GLint level, GLint xoffset,
 624                                          GLsizei width, GLenum format,
 625                                          GLsizei imageSize, const GLvoid *data,
 626                                          struct gl_texture_object *texObj,
 627                                          struct gl_texture_image *texImage );
 628    GLboolean (*CompressedTexSubImage2D)( GLcontext *ctx, GLenum target,
 629                                          GLint level, GLint xoffset,
 630                                          GLint yoffset, GLsizei width,
 631                                          GLint height, GLenum format,
 632                                          GLsizei imageSize, const GLvoid *data,
 633                                          struct gl_texture_object *texObj,
 634                                          struct gl_texture_image *texImage );
 635    GLboolean (*CompressedTexSubImage3D)( GLcontext *ctx, GLenum target,
 636                                          GLint level, GLint xoffset,
 637                                          GLint yoffset, GLint zoffset,
 638                                          GLsizei width, GLint height,
 639                                          GLint depth, GLenum format,
 640                                          GLsizei imageSize, const GLvoid *data,
 641                                          struct gl_texture_object *texObj,
 642                                          struct gl_texture_image *texImage );
 643    /* Called by glCompressedTexSubImage1/2/3D.
 644     * Arguments:
 645     *   <target>, <level>, <x/z/zoffset>, <width>, <height>, <depth>,
 646     *      <imageSize>, and <data> are user specified.
 647     *   <texObj> is the target texture object.
 648     *   <texImage> is the target texture image.  It will have the texture
 649     *      width, height, depth, border and internalFormat information.
 650     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 651     * should do the job.
 652     */
 653
 654    GLint (*BaseCompressedTexFormat)(GLcontext *ctx,
 655                                     GLint internalFormat);
 656    /* Called to compute the base format for a specific compressed
 657     * format.  Return -1 if the internalFormat is not a specific
 658     * compressed format that the driver recognizes.  Note the
 659     * return value differences between this function and
 660     * SpecificCompressedTexFormat below.
 661     */
 662
 663    GLint (*SpecificCompressedTexFormat)(GLcontext *ctx,
 664                                         GLint      internalFormat,
 665                                         GLint      numDimensions,
 666                                         GLint     *levelp,
 667                                         GLsizei   *widthp,
 668                                         GLsizei   *heightp,
 669                                         GLsizei   *depthp,
 670                                         GLint     *borderp,
 671                                         GLenum    *formatp,
 672                                         GLenum    *typep);
 673    /* Called to turn a generic texture format into a specific
 674     * texture format.  For example, if a driver implements
 675     * GL_3DFX_texture_compression_FXT1, this would map
 676     * GL_COMPRESSED_RGBA_ARB to GL_COMPRESSED_RGBA_FXT1_3DFX.
 677     *
 678     * If the driver does not know how to handle the compressed
 679     * format, then just return the generic format, and Mesa will
 680     * do the right thing with it.
 681     */
 682
 683    GLboolean (*IsCompressedFormat)(GLcontext *ctx, GLint internalFormat);
 684    /* Called to tell if a format is a compressed format.
 685     */
 686
 687    GLsizei (*CompressedImageSize)(GLcontext *ctx,
 688                                   GLenum internalFormat,
 689                                   GLuint numDimensions,
 690                                   GLuint width,
 691                                   GLuint height,
 692                                   GLuint depth);
 693    /* Calculate the size of a compressed image, given the image's
 694     * format and dimensions.
 695     */
 696
 697    void (*GetCompressedTexImage)( GLcontext *ctx, GLenum target,
 698                                   GLint lod, void *image,
 699                                   const struct gl_texture_object *texObj,
 700                                   struct gl_texture_image *texImage );
 701    /* Called by glGetCompressedTexImageARB.
 702     * <target>, <lod>, <image> are specified by user.
 703     * <texObj> is the source texture object.
 704     * <texImage> is the source texture image.
 705     */
 706
 707    void (*TexEnv)( GLcontext *ctx, GLenum target, GLenum pname,
 708                    const GLfloat *param );
 709    /* Called by glTexEnv*().
 710     */
 711
 712    void (*TexParameter)( GLcontext *ctx, GLenum target,
 713                          struct gl_texture_object *texObj,
 714                          GLenum pname, const GLfloat *params );
 715    /* Called by glTexParameter*().
 716     *    <target> is user specified
 717     *    <texObj> the texture object to modify
 718     *    <pname> is one of GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER,
 719     *       GL_TEXTURE_WRAP_[STR], or GL_TEXTURE_BORDER_COLOR.
 720     *    <params> is user specified.
 721     */
 722
 723    void (*BindTexture)( GLcontext *ctx, GLenum target,
 724                         struct gl_texture_object *tObj );
 725    /* Called by glBindTexture().
 726     */
 727
 728    void (*DeleteTexture)( GLcontext *ctx, struct gl_texture_object *tObj );
 729    /* Called when a texture object is about to be deallocated.  Driver
 730     * should free anything attached to the DriverData pointers.
 731     */
 732
 733    GLboolean (*IsTextureResident)( GLcontext *ctx,
 734                                    struct gl_texture_object *t );
 735    /* Called by glAreTextureResident().
 736     */
 737
 738    void (*PrioritizeTexture)( GLcontext *ctx,  struct gl_texture_object *t,
 739                               GLclampf priority );
 740    /* Called by glPrioritizeTextures().
 741     */
 742
 743    void (*ActiveTexture)( GLcontext *ctx, GLuint texUnitNumber );
 744    /* Called by glActiveTextureARB to set current texture unit.
 745     */
 746
 747    void (*UpdateTexturePalette)( GLcontext *ctx,
 748                                  struct gl_texture_object *tObj );
 749    /* Called when the texture's color lookup table is changed.
 750     * If tObj is NULL then the shared texture palette ctx->Texture.Palette
 751     * is to be updated.
 752     */
 753
 754
 755
 756    /***
 757     *** Accelerated point, line, polygon and quad functions:
 758     ***/
 759
 760    points_func   PointsFunc;
 761    line_func     LineFunc;
 762    triangle_func TriangleFunc;
 763    quad_func     QuadFunc;
 764
 765
 766    /***
 767     *** Transformation/Rendering functions
 768     ***/
 769
 770    void (*RenderStart)( GLcontext *ctx );
 771    void (*RenderFinish)( GLcontext *ctx );
 772     /* KW: These replace Begin and End, and have more relaxed semantics.
 773      * They are called prior-to and after one or more vb flush, and are
 774      * thus decoupled from the gl_begin/gl_end pairs, which are possibly
 775      * more frequent.  If a begin/end pair covers >1 vertex buffer, these
 776      * are called at most once for the pair. (a bit broken at present)
 777      */
 778
 779    void (*RasterSetup)( struct vertex_buffer *VB, GLuint start, GLuint end );
 780    /* This function, if not NULL, is called whenever new window coordinates
 781     * are put in the vertex buffer.  The vertices in question are those n
 782     * such that start <= n < end.
 783     * The device driver can convert the window coords to its own specialized
 784     * format.  The 3Dfx driver uses this.
 785     *
 786     * Note: Deprecated in favour of RegisterPipelineStages, below.
 787     */
 788
 789    render_func *RenderVBClippedTab;
 790    render_func *RenderVBCulledTab;
 791    render_func *RenderVBRawTab;
 792    /* These function tables allow the device driver to rasterize an
 793     * entire begin/end group of primitives at once.  See the
 794     * gl_render_vb() function in vbrender.c for more details.
 795     */
 796
 797    GLboolean (*MultipassFunc)( struct vertex_buffer *VB, GLuint passno );
 798    /* Driver may request additional render passes by returning GL_TRUE
 799     * when this function is called.  This function will be called
 800     * after the first pass, and passes will be made until the function
 801     * returns GL_FALSE.  If no function is registered, only one pass
 802     * is made.
 803     *
 804     * This function will be first invoked with passno == 1.
 805     */
 806
 807    /***
 808     *** NEW in Mesa 3.x
 809     ***/
 810
 811    void (*RegisterVB)( struct vertex_buffer *VB );
 812    void (*UnregisterVB)( struct vertex_buffer *VB );
 813    /* When Mesa creates a new vertex buffer it calls Driver.RegisterVB()
 814     * so the device driver can allocate its own vertex buffer data and
 815     * hook it to the VB->driver_data pointer.
 816     * When Mesa destroys a vertex buffer it calls Driver.UnegisterVB()
 817     * so the driver can deallocate its own data attached to VB->driver_data.
 818     */
 819
 820
 821
 822    GLboolean (*BuildPrecalcPipeline)( GLcontext *ctx );
 823    GLboolean (*BuildEltPipeline)( GLcontext *ctx );
 824    /* Perform the full pipeline build, or return false.
 825     */
 826
 827
 828    /***
 829     *** Support for multiple t&l engines
 830     ***/
 831
 832 #define FLUSH_INSIDE_BEGIN_END 0x1
 833 #define FLUSH_STORED_VERTICES  0x2
 834 #define FLUSH_UPDATE_CURRENT   0x4
 835
 836    GLuint NeedFlush;
 837    /* Set by the driver-supplied t&l engine.
 838     * Bitflags defined above are set whenever
 839     *     - the engine *might* be inside a begin/end object.
 840     *     - there *might* be buffered vertices to be flushed.
 841     *     - the ctx->Current values *might* not be uptodate.
 842     *
 843     * The FlushVertices() call below may be used to resolve
 844     * these conditions.
 845     */
 846
 847    GLboolean (*FlushVertices)( GLcontext *ctx, GLuint flags );
 848    /* If inside begin/end, returns GL_FALSE.
 849     * Otherwise,
 850     *   if (flags & FLUSH_STORED_VERTICES) flushes any buffered vertices,
 851     *   if (flags & FLUSH_UPDATE_CURRENT) updates ctx->Current,
 852     *   returns GL_TRUE.
 853     *
 854     * Note that the default t&l engine never clears the
 855     * FLUSH_UPDATE_CURRENT bit, even after performing the update.
 856     */
 857
 858    void (*LightingSpaceChange)( GLcontext *ctx );
 859    /* Notify driver that the special derived value _NeedEyeCoords has
 860     * changed.
 861     */
 862
 863    void (*NewList)( GLcontext *ctx, GLuint list, GLenum mode );
 864    void (*EndList)( GLcontext *ctx );
 865    /* Let the t&l component know what is going on with display lists
 866     * in time to make changes to dispatch tables, etc.
 867     */
 868
 869    void (*MakeCurrent)( GLcontext *ctx, GLframebuffer *drawBuffer,
 870                         GLframebuffer *readBuffer );
 871    /* Let the t&l component know when the context becomes current.
 872     */
 873
 874
 875    void (*LockArraysEXT)( GLcontext *ctx, GLint first, GLsizei count );
 876    void (*UnlockArraysEXT)( GLcontext *ctx );
 877    /*
 878     */
 879
 880
 881    /*
 882     * State-changing functions (drawing functions are above)
 883     *
 884     * These functions are called by their corresponding OpenGL API functions.
 885     * They're ALSO called by the gl_PopAttrib() function!!!
 886     * May add more functions like these to the device driver in the future.
 887     * This should reduce the amount of state checking that
 888     * the driver's UpdateState() function must do.
 889     */
 890    void (*AlphaFunc)(GLcontext *ctx, GLenum func, GLclampf ref);
 891    void (*BlendEquation)(GLcontext *ctx, GLenum mode);
 892    void (*BlendFunc)(GLcontext *ctx, GLenum sfactor, GLenum dfactor);
 893    void (*BlendFuncSeparate)( GLcontext *ctx, GLenum sfactorRGB,
 894                               GLenum dfactorRGB, GLenum sfactorA,
 895                               GLenum dfactorA );
 896    void (*ClearDepth)(GLcontext *ctx, GLclampd d);
 897    void (*ClearStencil)(GLcontext *ctx, GLint s);
 898    void (*ColorMask)(GLcontext *ctx, GLboolean rmask, GLboolean gmask,
 899                      GLboolean bmask, GLboolean amask );
 900    void (*CullFace)(GLcontext *ctx, GLenum mode);
 901    void (*ClipPlane)(GLcontext *ctx, GLenum plane, const GLfloat *equation );
 902    void (*FrontFace)(GLcontext *ctx, GLenum mode);
 903    void (*DepthFunc)(GLcontext *ctx, GLenum func);
 904    void (*DepthMask)(GLcontext *ctx, GLboolean flag);
 905    void (*DepthRange)(GLcontext *ctx, GLclampd nearval, GLclampd farval);
 906    void (*Enable)(GLcontext* ctx, GLenum cap, GLboolean state);
 907    void (*Fogfv)(GLcontext *ctx, GLenum pname, const GLfloat *params);
 908    void (*Hint)(GLcontext *ctx, GLenum target, GLenum mode);
 909    void (*IndexMask)(GLcontext *ctx, GLuint mask);
 910    void (*Lightfv)(GLcontext *ctx, GLenum light,
 911                    GLenum pname, const GLfloat *params );
 912    void (*LightModelfv)(GLcontext *ctx, GLenum pname, const GLfloat *params);
 913    void (*LineStipple)(GLcontext *ctx, GLint factor, GLushort pattern );
 914    void (*LineWidth)(GLcontext *ctx, GLfloat width);
 915    void (*LogicOpcode)(GLcontext *ctx, GLenum opcode);
 916    void (*PolygonMode)(GLcontext *ctx, GLenum face, GLenum mode);
 917    void (*PolygonStipple)(GLcontext *ctx, const GLubyte *mask );
 918    void (*Scissor)(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h);
 919    void (*ShadeModel)(GLcontext *ctx, GLenum mode);
 920    void (*StencilFunc)(GLcontext *ctx, GLenum func, GLint ref, GLuint mask);
 921    void (*StencilMask)(GLcontext *ctx, GLuint mask);
 922    void (*StencilOp)(GLcontext *ctx, GLenum fail, GLenum zfail, GLenum zpass);
 923    void (*TexGen)(GLcontext *ctx, GLenum coord, GLenum pname,
 924                   const GLfloat *params );
 925    void (*TextureMatrix)(GLcontext *ctx, GLuint unit, const GLmatrix *mat);
 926    void (*Viewport)(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h);
 927
 928    /* State-query functions
 929     *
 930     * Return GL_TRUE if query was completed, GL_FALSE otherwise.
 931     */
 932    GLboolean (*GetBooleanv)(GLcontext *ctx, GLenum pname, GLboolean *result);
 933    GLboolean (*GetDoublev)(GLcontext *ctx, GLenum pname, GLdouble *result);
 934    GLboolean (*GetFloatv)(GLcontext *ctx, GLenum pname, GLfloat *result);
 935    GLboolean (*GetIntegerv)(GLcontext *ctx, GLenum pname, GLint *result);
 936    GLboolean (*GetPointerv)(GLcontext *ctx, GLenum pname, GLvoid **result);
 937
 938
 939    void (*VertexPointer)(GLcontext *ctx, GLint size, GLenum type,
 940                          GLsizei stride, const GLvoid *ptr);
 941    void (*NormalPointer)(GLcontext *ctx, GLenum type,
 942                          GLsizei stride, const GLvoid *ptr);
 943    void (*ColorPointer)(GLcontext *ctx, GLint size, GLenum type,
 944                         GLsizei stride, const GLvoid *ptr);
 945    void (*FogCoordPointer)(GLcontext *ctx, GLenum type,
 946                            GLsizei stride, const GLvoid *ptr);
 947    void (*IndexPointer)(GLcontext *ctx, GLenum type,
 948                         GLsizei stride, const GLvoid *ptr);
 949    void (*SecondaryColorPointer)(GLcontext *ctx, GLint size, GLenum type,
 950                                  GLsizei stride, const GLvoid *ptr);
 951    void (*TexCoordPointer)(GLcontext *ctx, GLint size, GLenum type,
 952                            GLsizei stride, const GLvoid *ptr);
 953    void (*EdgeFlagPointer)(GLcontext *ctx, GLsizei stride, const GLvoid *ptr);
 954 };
 955
 956
 957
 958
 959
 960
 961
 962 typedef struct {
 963
 964    void (*ArrayElement)( GLint ); /* NOTE */
 965    void (*Color3f)( GLfloat, GLfloat, GLfloat );
 966    void (*Color3fv)( const GLfloat * );
 967    void (*Color3ub)( GLubyte, GLubyte, GLubyte );
 968    void (*Color3ubv)( const GLubyte * );
 969    void (*Color4f)( GLfloat, GLfloat, GLfloat, GLfloat );
 970    void (*Color4fv)( const GLfloat * );
 971    void (*Color4ub)( GLubyte, GLubyte, GLubyte, GLubyte );
 972    void (*Color4ubv)( const GLubyte * );
 973    void (*EdgeFlag)( GLboolean );
 974    void (*EdgeFlagv)( const GLboolean * );
 975    void (*EvalCoord1f)( GLfloat );          /* NOTE */
 976    void (*EvalCoord1fv)( const GLfloat * );          /* NOTE */
 977    void (*EvalCoord2f)( GLfloat, GLfloat ); /* NOTE */
 978    void (*EvalCoord2fv)( const GLfloat * ); /* NOTE */
 979    void (*EvalPoint1)( GLint );             /* NOTE */
 980    void (*EvalPoint2)( GLint, GLint );      /* NOTE */
 981    void (*FogCoordfEXT)( GLfloat );
 982    void (*FogCoordfvEXT)( const GLfloat * );
 983    void (*Indexi)( GLint );
 984    void (*Indexiv)( const GLint * );
 985    void (*Materialfv)( GLenum face, GLenum pname, const GLfloat * ); /* NOTE */
 986    void (*MultiTexCoord1fARB)( GLenum, GLfloat );
 987    void (*MultiTexCoord1fvARB)( GLenum, const GLfloat * );
 988    void (*MultiTexCoord2fARB)( GLenum, GLfloat, GLfloat );
 989    void (*MultiTexCoord2fvARB)( GLenum, const GLfloat * );
 990    void (*MultiTexCoord3fARB)( GLenum, GLfloat, GLfloat, GLfloat );
 991    void (*MultiTexCoord3fvARB)( GLenum, const GLfloat * );
 992    void (*MultiTexCoord4fARB)( GLenum, GLfloat, GLfloat, GLfloat, GLfloat );
 993    void (*MultiTexCoord4fvARB)( GLenum, const GLfloat * );
 994    void (*Normal3f)( GLfloat, GLfloat, GLfloat );
 995    void (*Normal3fv)( const GLfloat * );
 996    void (*SecondaryColor3fEXT)( GLfloat, GLfloat, GLfloat );
 997    void (*SecondaryColor3fvEXT)( const GLfloat * );
 998    void (*SecondaryColor3ubEXT)( GLubyte, GLubyte, GLubyte );
 999    void (*SecondaryColor3ubvEXT)( const GLubyte * );
1000    void (*TexCoord1f)( GLfloat );
1001    void (*TexCoord1fv)( const GLfloat * );
1002    void (*TexCoord2f)( GLfloat, GLfloat );
1003    void (*TexCoord2fv)( const GLfloat * );
1004    void (*TexCoord3f)( GLfloat, GLfloat, GLfloat );
1005    void (*TexCoord3fv)( const GLfloat * );
1006    void (*TexCoord4f)( GLfloat, GLfloat, GLfloat, GLfloat );
1007    void (*TexCoord4fv)( const GLfloat * );
1008    void (*Vertex2f)( GLfloat, GLfloat );
1009    void (*Vertex2fv)( const GLfloat * );
1010    void (*Vertex3f)( GLfloat, GLfloat, GLfloat );
1011    void (*Vertex3fv)( const GLfloat * );
1012    void (*Vertex4f)( GLfloat, GLfloat, GLfloat, GLfloat );
1013    void (*Vertex4fv)( const GLfloat * );
1014    void (*CallList)( GLuint );  /* NOTE */
1015    void (*Begin)( GLenum );
1016    void (*End)( void );
1017    /* Drivers present a reduced set of the functions possible in
1018     * begin/end objects.  Core mesa provides translation stubs for the
1019     * remaining functions to map down to these entrypoints.
1020     *
1021     * These are the initial values to be installed into dispatch by
1022     * mesa.  If the t&l driver wants to modify the dispatch table
1023     * while installed, it must do so itself.  It would be possible for
1024     * the vertexformat to install it's own initial values for these
1025     * functions, but this way there is an obvious list of what is
1026     * expected of the driver.
1027     *
1028     * If the driver wants to hook in entrypoints other than those
1029     * listed above, it must restore them to their original values in
1030     * the disable() callback, below.
1031     */
1032
1033    void (*Rectf)( GLfloat, GLfloat, GLfloat, GLfloat );
1034    /*
1035     */
1036
1037
1038    void (*DrawArrays)( GLenum mode, GLint start, GLsizei count );
1039    void (*DrawElements)( GLenum mode, GLsizei count, GLenum type,
1040                          const GLvoid *indices );
1041    void (*DrawRangeElements)(GLenum mode, GLuint start,
1042                              GLuint end, GLsizei count,
1043                              GLenum type, const GLvoid *indices);
1044    /* These may or may not belong here.  Heuristic: If an array is
1045     * enabled, the installed vertex format should support that array and
1046     * it's current size natively.
1047     */
1048
1049    void (*EvalMesh1)( GLenum mode, GLint i1, GLint i2 );
1050    void (*EvalMesh2)( GLenum mode, GLint i1, GLint i2, GLint j1, GLint j2 );
1051    /* If you don't support eval, fallback to the default vertex format
1052     * on receiving an eval call and use the pipeline mechanism to
1053     * provide partial t&l acceleration.
1054     *
1055     * Mesa will provide a set of helper functions to do eval within
1056     * accelerated vertex formats, eventually...
1057     */
1058
1059    GLboolean prefer_float_colors;
1060    /* Should core send non-standard colors to glColor4f or glColor4ub
1061     */
1062
1063
1064 } GLvertexformat;
1065
1066
1067 #endif
1068