src/mesa/main/dd.h

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  3.3
   5  *
   6  * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27
  28 #ifndef DD_INCLUDED
  29 #define DD_INCLUDED
  30
  31
  32 #include "macros.h"
  33
  34
  35 struct gl_pixelstore_attrib;
  36
  37
  38 struct vertex_buffer;
  39 struct immediate;
  40 struct gl_pipeline_stage;
  41
  42
  43 /* THIS FILE ONLY INCLUDED BY types.h !!!!! */
  44
  45
  46 /*
  47  *                      Device Driver (DD) interface
  48  *
  49  *
  50  * All device driver functions are accessed through pointers in the
  51  * dd_function_table struct (defined below) which is stored in the GLcontext
  52  * struct.  Since the device driver is strictly accessed trough a table of
  53  * function pointers we can:
  54  *   1. switch between a number of different device drivers at runtime.
  55  *   2. use optimized functions dependant on current rendering state or
  56  *      frame buffer configuration.
  57  *
  58  * The function pointers in the dd_function_table struct are divided into
  59  * two groups:  mandatory and optional.
  60  * Mandatory functions have to be implemented by every device driver.
  61  * Optional functions may or may not be implemented by the device driver.
  62  * The optional functions provide ways to take advantage of special hardware
  63  * or optimized algorithms.
  64  *
  65  * The function pointers in the dd_function_table struct should first be
  66  * initialized in the driver's "MakeCurrent" function.  The "MakeCurrent"
  67  * function is a little different in each device driver.  See the X/Mesa,
  68  * GLX, or OS/Mesa drivers for examples.
  69  *
  70  * Later, Mesa may call the dd_function_table's UpdateState() function.
  71  * This function should initialize the dd_function_table's pointers again.
  72  * The UpdateState() function is called whenever the core (GL) rendering
  73  * state is changed in a way which may effect rasterization.  For example,
  74  * the TriangleFunc() pointer may have to point to different functions
  75  * depending on whether smooth or flat shading is enabled.
  76  *
  77  * Note that the first argument to every device driver function is a
  78  * GLcontext *.  In turn, the GLcontext->DriverCtx pointer points to
  79  * the driver-specific context struct.  See the X/Mesa or OS/Mesa interface
  80  * for an example.
  81  *
  82  * For more information about writing a device driver see the ddsample.c
  83  * file and other device drivers (X/xmesa[1234].c, OSMesa/osmesa.c, etc)
  84  * for examples.
  85  *
  86  *
  87  * Look below in the dd_function_table struct definition for descriptions
  88  * of each device driver function.
  89  *
  90  *
  91  * In the future more function pointers may be added for glReadPixels
  92  * glCopyPixels, etc.
  93  *
  94  *
  95  * Notes:
  96  * ------
  97  *   RGBA = red/green/blue/alpha
  98  *   CI = color index (color mapped mode)
  99  *   mono = all pixels have the same color or index
 100  *
 101  *   The write_ functions all take an array of mask flags which indicate
 102  *   whether or not the pixel should be written.  One special case exists
 103  *   in the write_color_span function: if the mask array is NULL, then
 104  *   draw all pixels.  This is an optimization used for glDrawPixels().
 105  *
 106  * IN ALL CASES:
 107  *      X coordinates start at 0 at the left and increase to the right
 108  *      Y coordinates start at 0 at the bottom and increase upward
 109  *
 110  */
 111
 112
 113
 114
 115 /* Used by the GetParameteri device driver function */
 116 #define DD_HAVE_HARDWARE_FOG         3
 117
 118
 119
 120 /* Mask bits sent to the driver Clear() function */
 121 #define DD_FRONT_LEFT_BIT  FRONT_LEFT_BIT         /* 1 */
 122 #define DD_FRONT_RIGHT_BIT FRONT_RIGHT_BIT        /* 2 */
 123 #define DD_BACK_LEFT_BIT   BACK_LEFT_BIT          /* 4 */
 124 #define DD_BACK_RIGHT_BIT  BACK_RIGHT_BIT         /* 8 */
 125 #define DD_DEPTH_BIT       GL_DEPTH_BUFFER_BIT    /* 0x00000100 */
 126 #define DD_STENCIL_BIT     GL_STENCIL_BUFFER_BIT  /* 0x00000400 */
 127 #define DD_ACCUM_BIT       GL_ACCUM_BUFFER_BIT    /* 0x00000200 */
 128
 129
 130
 131 /*
 132  * Device Driver function table.
 133  */
 134 struct dd_function_table {
 135
 136    /**********************************************************************
 137     *** Mandatory functions:  these functions must be implemented by   ***
 138     *** every device driver.                                           ***
 139     **********************************************************************/
 140
 141    const GLubyte * (*GetString)( GLcontext *ctx, GLenum name );
 142    /* Return a string as needed by glGetString().
 143     * Only the GL_RENDERER token must be implemented.  Otherwise,
 144     * NULL can be returned.
 145     */
 146
 147    void (*UpdateState)( GLcontext *ctx );
 148    /*
 149     * UpdateState() is called whenver Mesa thinks the device driver should
 150     * update its state and/or the other pointers (such as PointsFunc,
 151     * LineFunc, or TriangleFunc).
 152     */
 153
 154    void (*ClearIndex)( GLcontext *ctx, GLuint index );
 155    /*
 156     * Called whenever glClearIndex() is called.  Set the index for clearing
 157     * the color buffer when in color index mode.
 158     */
 159
 160    void (*ClearColor)( GLcontext *ctx, GLubyte red, GLubyte green,
 161                                         GLubyte blue, GLubyte alpha );
 162    /*
 163     * Called whenever glClearColor() is called.  Set the color for clearing
 164     * the color buffer when in RGBA mode.
 165     */
 166
 167    GLbitfield (*Clear)( GLcontext *ctx, GLbitfield mask, GLboolean all,
 168                         GLint x, GLint y, GLint width, GLint height );
 169    /* Clear the color/depth/stencil/accum buffer(s).
 170     * 'mask' is a bitmask of the DD_*_BIT values defined above that indicates
 171     * which buffers need to be cleared.  The driver should clear those
 172     * buffers then return a new bitmask indicating which buffers should be
 173     * cleared by software Mesa.
 174     * If 'all' is true then the clear the whole buffer, else clear only the
 175     * region defined by (x,y,width,height).
 176     * This function must obey the glColorMask, glIndexMask and glStencilMask
 177     * settings!  Software Mesa can do masked clears if the device driver can't.
 178     */
 179
 180    void (*Index)( GLcontext *ctx, GLuint index );
 181    /*
 182     * Sets current color index for drawing flat-shaded primitives.
 183     * This index should also be used in the "mono" drawing functions.
 184     */
 185
 186    void (*Color)( GLcontext *ctx,
 187                   GLubyte red, GLubyte green, GLubyte glue, GLubyte alpha );
 188    /*
 189     * Sets current color for drawing flat-shaded primitives.
 190     * This color should also be used in the "mono" drawing functions.
 191     */
 192
 193    GLboolean (*SetDrawBuffer)( GLcontext *ctx, GLenum buffer );
 194    /*
 195     * Specifies the current buffer for writing.
 196     * The following values must be accepted when applicable:
 197     *    GL_FRONT_LEFT - this buffer always exists
 198     *    GL_BACK_LEFT - when double buffering
 199     *    GL_FRONT_RIGHT - when using stereo
 200     *    GL_BACK_RIGHT - when using stereo and double buffering
 201     * The folowing values may optionally be accepted.  Return GL_TRUE
 202     * if accepted, GL_FALSE if not accepted.  In practice, only drivers
 203     * which can write to multiple color buffers at once should accept
 204     * these values.
 205     *    GL_FRONT - write to front left and front right if it exists
 206     *    GL_BACK - write to back left and back right if it exists
 207     *    GL_LEFT - write to front left and back left if it exists
 208     *    GL_RIGHT - write to right left and back right if they exist
 209     *    GL_FRONT_AND_BACK - write to all four buffers if they exist
 210     *    GL_NONE - disable buffer write in device driver.
 211     */
 212
 213    void (*SetReadBuffer)( GLcontext *ctx, GLframebuffer *colorBuffer,
 214                           GLenum buffer );
 215    /*
 216     * Specifies the current buffer for reading.
 217     * colorBuffer will be one of:
 218     *    GL_FRONT_LEFT - this buffer always exists
 219     *    GL_BACK_LEFT - when double buffering
 220     *    GL_FRONT_RIGHT - when using stereo
 221     *    GL_BACK_RIGHT - when using stereo and double buffering
 222     */
 223
 224    void (*GetBufferSize)( GLcontext *ctx, GLuint *width, GLuint *height );
 225    /*
 226     * Returns the width and height of the current color buffer.
 227     */
 228
 229
 230    /***
 231     *** Functions for writing pixels to the frame buffer:
 232     ***/
 233
 234    void (*WriteRGBASpan)( const GLcontext *ctx,
 235                           GLuint n, GLint x, GLint y,
 236                           CONST GLubyte rgba[][4], const GLubyte mask[] );
 237    void (*WriteRGBSpan)( const GLcontext *ctx,
 238                          GLuint n, GLint x, GLint y,
 239                          CONST GLubyte rgb[][3], const GLubyte mask[] );
 240    /* Write a horizontal run of RGBA or RGB pixels.
 241     * If mask is NULL, draw all pixels.
 242     * If mask is not null, only draw pixel [i] when mask [i] is true.
 243     */
 244
 245    void (*WriteMonoRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 246                               const GLubyte mask[] );
 247    /* Write a horizontal run of RGBA pixels all with the color last
 248     * specified by the Color function.
 249     */
 250
 251    void (*WriteRGBAPixels)( const GLcontext *ctx,
 252                             GLuint n, const GLint x[], const GLint y[],
 253                             CONST GLubyte rgba[][4], const GLubyte mask[] );
 254    /* Write array of RGBA pixels at random locations.
 255     */
 256
 257    void (*WriteMonoRGBAPixels)( const GLcontext *ctx,
 258                                 GLuint n, const GLint x[], const GLint y[],
 259                                 const GLubyte mask[] );
 260    /* Write an array of mono-RGBA pixels at random locations.
 261     */
 262
 263    void (*WriteCI32Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 264                           const GLuint index[], const GLubyte mask[] );
 265    void (*WriteCI8Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 266                          const GLubyte index[], const GLubyte mask[] );
 267    /* Write a horizontal run of CI pixels.  One function is for 32bpp
 268     * indexes and the other for 8bpp pixels (the common case).  You mus
 269     * implement both for color index mode.
 270     */
 271
 272    void (*WriteMonoCISpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 273                             const GLubyte mask[] );
 274    /* Write a horizontal run of color index pixels using the color index
 275     * last specified by the Index() function.
 276     */
 277
 278    void (*WriteCI32Pixels)( const GLcontext *ctx,
 279                             GLuint n, const GLint x[], const GLint y[],
 280                             const GLuint index[], const GLubyte mask[] );
 281    /*
 282     * Write a random array of CI pixels.
 283     */
 284
 285    void (*WriteMonoCIPixels)( const GLcontext *ctx,
 286                               GLuint n, const GLint x[], const GLint y[],
 287                               const GLubyte mask[] );
 288    /* Write a random array of color index pixels using the color index
 289     * last specified by the Index() function.
 290     */
 291
 292
 293    /***
 294     *** Functions to read pixels from frame buffer:
 295     ***/
 296
 297    void (*ReadCI32Span)( const GLcontext *ctx,
 298                          GLuint n, GLint x, GLint y, GLuint index[] );
 299    /* Read a horizontal run of color index pixels.
 300     */
 301
 302    void (*ReadRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
 303                          GLubyte rgba[][4] );
 304    /* Read a horizontal run of RGBA pixels.
 305     */
 306
 307    void (*ReadCI32Pixels)( const GLcontext *ctx,
 308                            GLuint n, const GLint x[], const GLint y[],
 309                            GLuint indx[], const GLubyte mask[] );
 310    /* Read a random array of CI pixels.
 311     */
 312
 313    void (*ReadRGBAPixels)( const GLcontext *ctx,
 314                            GLuint n, const GLint x[], const GLint y[],
 315                            GLubyte rgba[][4], const GLubyte mask[] );
 316    /* Read a random array of RGBA pixels.
 317     */
 318
 319
 320    /**********************************************************************
 321     *** Optional functions:  these functions may or may not be         ***
 322     *** implemented by the device driver.  If the device driver        ***
 323     *** doesn't implement them it should never touch these pointers    ***
 324     *** since Mesa will either set them to NULL or point them at a     ***
 325     *** fall-back function.                                            ***
 326     **********************************************************************/
 327
 328    void (*Finish)( GLcontext *ctx );
 329    /*
 330     * This is called whenever glFinish() is called.
 331     */
 332
 333    void (*Flush)( GLcontext *ctx );
 334    /*
 335     * This is called whenever glFlush() is called.
 336     */
 337
 338    GLboolean (*IndexMask)( GLcontext *ctx, GLuint mask );
 339    /*
 340     * Implements glIndexMask() if possible, else return GL_FALSE.
 341     */
 342
 343    GLboolean (*ColorMask)( GLcontext *ctx,
 344                            GLboolean rmask, GLboolean gmask,
 345                            GLboolean bmask, GLboolean amask );
 346    /*
 347     * Implements glColorMask() if possible, else return GL_FALSE.
 348     */
 349
 350    GLboolean (*LogicOp)( GLcontext *ctx, GLenum op );
 351    /*
 352     * Implements glLogicOp() if possible, else return GL_FALSE.
 353     */
 354
 355    void (*Dither)( GLcontext *ctx, GLboolean enable );
 356    /*
 357     * Enable/disable dithering.
 358     * NOTE: This function will be removed in the future in favor
 359     * of the "Enable" driver function.
 360     */
 361
 362    void (*Error)( GLcontext *ctx );
 363    /*
 364     * Called whenever an error is generated.  ctx->ErrorValue contains
 365     * the error value.
 366     */
 367
 368    void (*NearFar)( GLcontext *ctx, GLfloat nearVal, GLfloat farVal );
 369    /*
 370     * Called from glFrustum and glOrtho to tell device driver the
 371     * near and far clipping plane Z values.  The 3Dfx driver, for example,
 372     * uses this.
 373     */
 374
 375    GLint (*GetParameteri)( const GLcontext *ctx, GLint param );
 376    /* Query the device driver to get an integer parameter.
 377     * Current parameters:
 378     *     DD_MAX_TEXTURE_SIZE         return maximum texture size
 379     *
 380     *     DD_MAX_TEXTURES             number of texture sets/stages, usually 1
 381     *
 382     *     DD_HAVE_HARDWARE_FOG        the driver should return 1 (0 otherwise)
 383     *                                 when the hardware support per fragment
 384     *                                 fog for free (like the Voodoo Graphics)
 385     *                                 so the Mesa core will start to ever use
 386     *                                 per fragment fog
 387     */
 388
 389
 390    /***
 391     *** For supporting hardware Z buffers:
 392     *** Either ALL or NONE of these functions must be implemented!
 393     *** NOTE that Each depth value is a 32-bit GLuint.  If the depth
 394     *** buffer is less than 32 bits deep then the extra upperbits are zero.
 395     ***/
 396
 397    void (*WriteDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 398                            const GLdepth depth[], const GLubyte mask[] );
 399    /* Write a horizontal span of values into the depth buffer.  Only write
 400     * depth[i] value if mask[i] is nonzero.
 401     */
 402
 403    void (*ReadDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 404                           GLdepth depth[] );
 405    /* Read a horizontal span of values from the depth buffer.
 406     */
 407
 408
 409    void (*WriteDepthPixels)( GLcontext *ctx, GLuint n,
 410                              const GLint x[], const GLint y[],
 411                              const GLdepth depth[], const GLubyte mask[] );
 412    /* Write an array of randomly positioned depth values into the
 413     * depth buffer.  Only write depth[i] value if mask[i] is nonzero.
 414     */
 415
 416    void (*ReadDepthPixels)( GLcontext *ctx, GLuint n,
 417                             const GLint x[], const GLint y[],
 418                             GLdepth depth[] );
 419    /* Read an array of randomly positioned depth values from the depth buffer.
 420     */
 421
 422
 423
 424    /***
 425     *** For supporting hardware stencil buffers:
 426     *** Either ALL or NONE of these functions must be implemented!
 427     ***/
 428
 429    void (*WriteStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 430                              const GLstencil stencil[], const GLubyte mask[] );
 431    /* Write a horizontal span of stencil values into the stencil buffer.
 432     * If mask is NULL, write all stencil values.
 433     * Else, only write stencil[i] if mask[i] is non-zero.
 434     */
 435
 436    void (*ReadStencilSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
 437                             GLstencil stencil[] );
 438    /* Read a horizontal span of stencil values from the stencil buffer.
 439     */
 440
 441    void (*WriteStencilPixels)( GLcontext *ctx, GLuint n,
 442                                const GLint x[], const GLint y[],
 443                                const GLstencil stencil[],
 444                                const GLubyte mask[] );
 445    /* Write an array of stencil values into the stencil buffer.
 446     * If mask is NULL, write all stencil values.
 447     * Else, only write stencil[i] if mask[i] is non-zero.
 448     */
 449
 450    void (*ReadStencilPixels)( GLcontext *ctx, GLuint n,
 451                               const GLint x[], const GLint y[],
 452                               GLstencil stencil[] );
 453    /* Read an array of stencil values from the stencil buffer.
 454     */
 455
 456
 457    /***
 458     *** glDraw/Read/CopyPixels and glBitmap functions:
 459     ***/
 460
 461    GLboolean (*DrawPixels)( GLcontext *ctx,
 462                             GLint x, GLint y, GLsizei width, GLsizei height,
 463                             GLenum format, GLenum type,
 464                             const struct gl_pixelstore_attrib *unpack,
 465                             const GLvoid *pixels );
 466    /* This is called by glDrawPixels.
 467     * 'unpack' describes how to unpack the source image data.
 468     * Return GL_TRUE if the driver succeeds, return GL_FALSE if core Mesa
 469     * must do the job.
 470     */
 471
 472    GLboolean (*ReadPixels)( GLcontext *ctx,
 473                             GLint x, GLint y, GLsizei width, GLsizei height,
 474                             GLenum format, GLenum type,
 475                             const struct gl_pixelstore_attrib *unpack,
 476                             GLvoid *dest );
 477    /* Called by glReadPixels.
 478     * Return GL_TRUE if operation completed, else return GL_FALSE.
 479     * This function must respect all glPixelTransfer settings.
 480     */
 481
 482    GLboolean (*CopyPixels)( GLcontext *ctx,
 483                             GLint srcx, GLint srcy,
 484                             GLsizei width, GLsizei height,
 485                             GLint dstx, GLint dsty, GLenum type );
 486    /* Do a glCopyPixels.  Return GL_TRUE if operation completed, else
 487     * return GL_FALSE.  This function must respect all rasterization
 488     * state, glPixelTransfer, glPixelZoom, etc.
 489     */
 490
 491    GLboolean (*Bitmap)( GLcontext *ctx,
 492                         GLint x, GLint y, GLsizei width, GLsizei height,
 493                         const struct gl_pixelstore_attrib *unpack,
 494                         const GLubyte *bitmap );
 495    /* This is called by glBitmap.  Works the same as DrawPixels, above.
 496     */
 497
 498
 499    /***
 500     *** Texture mapping functions:
 501     ***/
 502
 503    void (*TexImage)( GLcontext *ctx, GLenum target,
 504                      struct gl_texture_object *tObj, GLint level,
 505                      GLint internalFormat,
 506                      const struct gl_texture_image *image );
 507    /* XXX this function is obsolete */
 508    /* Called whenever a texture object's image is changed.
 509     *    texObject is the number of the texture object being changed.
 510     *    level indicates the mipmap level.
 511     *    internalFormat is the format in which the texture is to be stored.
 512     *    image is a pointer to a gl_texture_image struct which contains
 513     *       the actual image data.
 514     */
 515
 516    void (*TexSubImage)( GLcontext *ctx, GLenum target,
 517                         struct gl_texture_object *tObj, GLint level,
 518                         GLint xoffset, GLint yoffset,
 519                         GLsizei width, GLsizei height,
 520                         GLint internalFormat,
 521                         const struct gl_texture_image *image );
 522    /* XXX this function is obsolete */
 523    /* Called from glTexSubImage() to define a sub-region of a texture.
 524     */
 525
 526
 527    GLboolean (*TexImage1D)( GLcontext *ctx, GLenum target, GLint level,
 528                             GLenum format, GLenum type, const GLvoid *pixels,
 529                             const struct gl_pixelstore_attrib *packing,
 530                             struct gl_texture_object *texObj,
 531                             struct gl_texture_image *texImage,
 532                             GLboolean *retainInternalCopy );
 533    GLboolean (*TexImage2D)( GLcontext *ctx, GLenum target, GLint level,
 534                             GLenum format, GLenum type, const GLvoid *pixels,
 535                             const struct gl_pixelstore_attrib *packing,
 536                             struct gl_texture_object *texObj,
 537                             struct gl_texture_image *texImage,
 538                             GLboolean *retainInternalCopy );
 539    GLboolean (*TexImage3D)( GLcontext *ctx, GLenum target, GLint level,
 540                             GLenum format, GLenum type, const GLvoid *pixels,
 541                             const struct gl_pixelstore_attrib *packing,
 542                             struct gl_texture_object *texObj,
 543                             struct gl_texture_image *texImage,
 544                             GLboolean *retainInternalCopy );
 545    /* Called by glTexImage1/2/3D.
 546     * Will not be called if any glPixelTransfer operations are enabled.
 547     * Arguments:
 548     *   <target>, <level>, <format>, <type> and <pixels> are user specified.
 549     *   <packing> indicates the image packing of pixels.
 550     *   <texObj> is the target texture object.
 551     *   <texImage> is the target texture image.  It will have the texture
 552     *      width, height, depth, border and internalFormat information.
 553     *   <retainInternalCopy> is returned by this function and indicates whether
 554     *      core Mesa should keep an internal copy of the texture image.
 555     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 556     * should do the job.  If GL_FALSE is returned, this function will be
 557     * called a second time after the texture image has been unpacked into
 558     * GLubytes.  It may be easier for the driver to handle then.
 559     */
 560
 561    GLboolean (*TexSubImage1D)( GLcontext *ctx, GLenum target, GLint level,
 562                                GLint xoffset, GLsizei width,
 563                                GLenum format, GLenum type,
 564                                const GLvoid *pixels,
 565                                const struct gl_pixelstore_attrib *packing,
 566                                struct gl_texture_object *texObj,
 567                                struct gl_texture_image *texImage );
 568    GLboolean (*TexSubImage2D)( GLcontext *ctx, GLenum target, GLint level,
 569                                GLint xoffset, GLint yoffset,
 570                                GLsizei width, GLsizei height,
 571                                GLenum format, GLenum type,
 572                                const GLvoid *pixels,
 573                                const struct gl_pixelstore_attrib *packing,
 574                                struct gl_texture_object *texObj,
 575                                struct gl_texture_image *texImage );
 576    GLboolean (*TexSubImage3D)( GLcontext *ctx, GLenum target, GLint level,
 577                                GLint xoffset, GLint yoffset, GLint zoffset,
 578                                GLsizei width, GLsizei height, GLint depth,
 579                                GLenum format, GLenum type,
 580                                const GLvoid *pixels,
 581                                const struct gl_pixelstore_attrib *packing,
 582                                struct gl_texture_object *texObj,
 583                                struct gl_texture_image *texImage );
 584    /* Called by glTexSubImage1/2/3D.
 585     * Will not be called if any glPixelTransfer operations are enabled.
 586     * Arguments:
 587     *   <target>, <level>, <xoffset>, <yoffset>, <zoffset>, <width>, <height>,
 588     *      <depth>, <format>, <type> and <pixels> are user specified.
 589     *   <packing> indicates the image packing of pixels.
 590     *   <texObj> is the target texture object.
 591     *   <texImage> is the target texture image.  It will have the texture
 592     *      width, height, border and internalFormat information.
 593     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 594     * should do the job.  If GL_FALSE is returned, then TexImage1/2/3D will
 595     * be called with the complete texture image.
 596     */
 597
 598    GLboolean (*CopyTexImage1D)( GLcontext *ctx, GLenum target, GLint level,
 599                                 GLenum internalFormat, GLint x, GLint y,
 600                                 GLsizei width, GLint border );
 601    GLboolean (*CopyTexImage2D)( GLcontext *ctx, GLenum target, GLint level,
 602                                 GLenum internalFormat, GLint x, GLint y,
 603                                 GLsizei width, GLsizei height, GLint border );
 604    /* Called by glCopyTexImage1D and glCopyTexImage2D.
 605     * Will not be called if any glPixelTransfer operations are enabled.
 606     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 607     * should do the job.
 608     */
 609
 610    GLboolean (*CopyTexSubImage1D)( GLcontext *ctx, GLenum target, GLint level,
 611                                    GLint xoffset,
 612                                    GLint x, GLint y, GLsizei width );
 613    GLboolean (*CopyTexSubImage2D)( GLcontext *ctx, GLenum target, GLint level,
 614                                    GLint xoffset, GLint yoffset,
 615                                    GLint x, GLint y,
 616                                    GLsizei width, GLsizei height );
 617    GLboolean (*CopyTexSubImage3D)( GLcontext *ctx, GLenum target, GLint level,
 618                                    GLint xoffset, GLint yoffset, GLint zoffset,
 619                                    GLint x, GLint y,
 620                                    GLsizei width, GLsizei height );
 621    /* Called by glCopyTexSubImage1/2/3D.
 622     * Will not be called if any glPixelTransfer operations are enabled.
 623     * Return GL_TRUE if operation completed, return GL_FALSE if core Mesa
 624     * should do the job.
 625     */
 626
 627    GLvoid *(*GetTexImage)( GLcontext *ctx, GLenum target, GLint level,
 628                            const struct gl_texture_object *texObj,
 629                            GLenum *formatOut, GLenum *typeOut,
 630                            GLboolean *freeImageOut );
 631    /* Called by glGetTexImage or by core Mesa when a texture image
 632     * is needed for software fallback rendering.
 633     * Return the address of the texture image or NULL if failure.
 634     * The image must be tightly packed (i.e. row stride = image width)
 635     * Return the image's format and type in formatOut and typeOut.
 636     * The format and type must be values which are accepted by glTexImage.
 637     * Set the freeImageOut flag if the returned image should be deallocated
 638     * with FREE() when finished.
 639     * The size of the image can be deduced from the target and level.
 640     * Core Mesa will perform any image format/type conversions that are needed.
 641     */
 642
 643    void (*TexEnv)( GLcontext *ctx, GLenum target, GLenum pname,
 644                    const GLfloat *param );
 645    /* Called by glTexEnv*().
 646     */
 647
 648    void (*TexParameter)( GLcontext *ctx, GLenum target,
 649                          struct gl_texture_object *texObj,
 650                          GLenum pname, const GLfloat *params );
 651    /* Called by glTexParameter*().
 652     *    <target> is user specified
 653     *    <texObj> the texture object to modify
 654     *    <pname> is one of GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MAG_FILTER,
 655     *       GL_TEXTURE_WRAP_[STR], or GL_TEXTURE_BORDER_COLOR.
 656     *    <params> is user specified.
 657     */
 658
 659    void (*BindTexture)( GLcontext *ctx, GLenum target,
 660                         struct gl_texture_object *tObj );
 661    /* Called by glBindTexture().
 662     */
 663
 664    void (*DeleteTexture)( GLcontext *ctx, struct gl_texture_object *tObj );
 665    /* Called when a texture object is about to be deallocated.  Driver
 666     * should free anything attached to the DriverData pointers.
 667     */
 668
 669    GLboolean (*IsTextureResident)( GLcontext *ctx,
 670                                    struct gl_texture_object *t );
 671    /* Called by glAreTextureResident().
 672     */
 673
 674    void (*PrioritizeTexture)( GLcontext *ctx,  struct gl_texture_object *t,
 675                               GLclampf priority );
 676    /* Called by glPrioritizeTextures().
 677     */
 678
 679    void (*ActiveTexture)( GLcontext *ctx, GLuint texUnitNumber );
 680    /* Called by glActiveTextureARB to set current texture unit.
 681     */
 682
 683    void (*UpdateTexturePalette)( GLcontext *ctx,
 684                                  struct gl_texture_object *tObj );
 685    /* Called when the texture's color lookup table is changed.
 686     * If tObj is NULL then the shared texture palette ctx->Texture.Palette
 687     * is to be updated.
 688     */
 689
 690
 691
 692    /***
 693     *** Accelerated point, line, polygon, glDrawPixels and glBitmap functions:
 694     ***/
 695
 696    points_func   PointsFunc;
 697    line_func     LineFunc;
 698    triangle_func TriangleFunc;
 699    quad_func     QuadFunc;
 700    rect_func     RectFunc;
 701
 702
 703    /***
 704     *** Transformation/Rendering functions
 705     ***/
 706
 707    void (*RenderStart)( GLcontext *ctx );
 708    void (*RenderFinish)( GLcontext *ctx );
 709     /* KW: These replace Begin and End, and have more relaxed semantics.
 710      * They are called prior-to and after one or more vb flush, and are
 711      * thus decoupled from the gl_begin/gl_end pairs, which are possibly
 712      * more frequent.  If a begin/end pair covers >1 vertex buffer, these
 713      * are called at most once for the pair. (a bit broken at present)
 714      */
 715
 716    void (*RasterSetup)( struct vertex_buffer *VB, GLuint start, GLuint end );
 717    /* This function, if not NULL, is called whenever new window coordinates
 718     * are put in the vertex buffer.  The vertices in question are those n
 719     * such that start <= n < end.
 720     * The device driver can convert the window coords to its own specialized
 721     * format.  The 3Dfx driver uses this.
 722     *
 723     * Note: Deprecated in favour of RegisterPipelineStages, below.
 724     */
 725
 726    render_func *RenderVBClippedTab;
 727    render_func *RenderVBCulledTab;
 728    render_func *RenderVBRawTab;
 729    /* These function tables allow the device driver to rasterize an
 730     * entire begin/end group of primitives at once.  See the
 731     * gl_render_vb() function in vbrender.c for more details.
 732     */
 733
 734    void (*ReducedPrimitiveChange)( GLcontext *ctx, GLenum primitive );
 735    /* If registered, this will be called when rendering transitions between
 736     * points, lines and triangles.  It is not called on transitions between
 737     * primtives such as GL_TRIANGLES and GL_TRIANGLE_STRIPS, or between
 738     * triangles and quads or triangles and polygons.
 739     */
 740
 741    GLuint TriangleCaps;
 742    /* Holds a list of the reasons why we might normally want to call
 743     * render_triangle, but which are in fact implemented by the
 744     * driver.  The FX driver sets this to DD_TRI_CULL, and will soon
 745     * implement DD_TRI_OFFSET.
 746     */
 747
 748    GLboolean (*MultipassFunc)( struct vertex_buffer *VB, GLuint passno );
 749    /* Driver may request additional render passes by returning GL_TRUE
 750     * when this function is called.  This function will be called
 751     * after the first pass, and passes will be made until the function
 752     * returns GL_FALSE.  If no function is registered, only one pass
 753     * is made.
 754     *
 755     * This function will be first invoked with passno == 1.
 756     */
 757
 758    /***
 759     *** NEW in Mesa 3.x
 760     ***/
 761
 762    void (*RegisterVB)( struct vertex_buffer *VB );
 763    void (*UnregisterVB)( struct vertex_buffer *VB );
 764    /* Do any processing (eg allocate memory) required to set up a new
 765     * vertex_buffer.
 766     */
 767
 768
 769    void (*ResetVB)( struct vertex_buffer *VB );
 770    void (*ResetCvaVB)( struct vertex_buffer *VB, GLuint stages );
 771    /* Do any reset operations necessary to the driver data associated
 772     * with these vertex buffers.
 773     */
 774
 775    GLuint RenderVectorFlags;
 776    /* What do the render tables require of the vectors they deal
 777     * with?
 778     */
 779
 780    GLuint (*RegisterPipelineStages)( struct gl_pipeline_stage *out,
 781                                      const struct gl_pipeline_stage *in,
 782                                      GLuint nr );
 783    /* Register new pipeline stages, or modify existing ones.  See also
 784     * the OptimizePipeline() functions.
 785     */
 786
 787
 788    GLboolean (*BuildPrecalcPipeline)( GLcontext *ctx );
 789    GLboolean (*BuildEltPipeline)( GLcontext *ctx );
 790    /* Perform the full pipeline build, or return false.
 791     */
 792
 793
 794    void (*OptimizePrecalcPipeline)( GLcontext *ctx, struct gl_pipeline *pipe );
 795    void (*OptimizeImmediatePipeline)( GLcontext *ctx, struct gl_pipeline *pipe);
 796    /* Check to see if a fast path exists for this combination of stages
 797     * in the precalc and immediate (elt) pipelines.
 798     */
 799
 800
 801    /*
 802     * State-changing functions (drawing functions are above)
 803     *
 804     * These functions are called by their corresponding OpenGL API functions.
 805     * They're ALSO called by the gl_PopAttrib() function!!!
 806     * May add more functions like these to the device driver in the future.
 807     * This should reduce the amount of state checking that
 808     * the driver's UpdateState() function must do.
 809     */
 810    void (*AlphaFunc)(GLcontext *ctx, GLenum func, GLclampf ref);
 811    void (*BlendEquation)(GLcontext *ctx, GLenum mode);
 812    void (*BlendFunc)(GLcontext *ctx, GLenum sfactor, GLenum dfactor);
 813    void (*BlendFuncSeparate)( GLcontext *ctx, GLenum sfactorRGB,
 814                               GLenum dfactorRGB, GLenum sfactorA,
 815                               GLenum dfactorA );
 816    void (*ClearDepth)(GLcontext *ctx, GLclampd d);
 817    void (*CullFace)(GLcontext *ctx, GLenum mode);
 818    void (*FrontFace)(GLcontext *ctx, GLenum mode);
 819    void (*DepthFunc)(GLcontext *ctx, GLenum func);
 820    void (*DepthMask)(GLcontext *ctx, GLboolean flag);
 821    void (*DepthRange)(GLcontext *ctx, GLclampd nearval, GLclampd farval);
 822    void (*Enable)(GLcontext* ctx, GLenum cap, GLboolean state);
 823    void (*Fogfv)(GLcontext *ctx, GLenum pname, const GLfloat *params);
 824    void (*Hint)(GLcontext *ctx, GLenum target, GLenum mode);
 825    void (*Lightfv)(GLcontext *ctx, GLenum light,
 826                    GLenum pname, const GLfloat *params, GLint nparams );
 827    void (*LightModelfv)(GLcontext *ctx, GLenum pname, const GLfloat *params);
 828    void (*LineStipple)(GLcontext *ctx, GLint factor, GLushort pattern );
 829    void (*LineWidth)(GLcontext *ctx, GLfloat width);
 830    void (*LogicOpcode)(GLcontext *ctx, GLenum opcode);
 831    void (*PolygonMode)(GLcontext *ctx, GLenum face, GLenum mode);
 832    void (*PolygonStipple)(GLcontext *ctx, const GLubyte *mask );
 833    void (*Scissor)(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h);
 834    void (*ShadeModel)(GLcontext *ctx, GLenum mode);
 835    void (*ClearStencil)(GLcontext *ctx, GLint s);
 836    void (*StencilFunc)(GLcontext *ctx, GLenum func, GLint ref, GLuint mask);
 837    void (*StencilMask)(GLcontext *ctx, GLuint mask);
 838    void (*StencilOp)(GLcontext *ctx, GLenum fail, GLenum zfail, GLenum zpass);
 839    void (*Viewport)(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h);
 840 };
 841
 842
 843
 844 #endif
 845