src/glx/glcontextmodes.c

   1 /*
   2  * (C) Copyright IBM Corporation 2003
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file glcontextmodes.c
  27  * Utility routines for working with \c __GLcontextModes structures.  At
  28  * some point most or all of these functions will be moved to the Mesa
  29  * code base.
  30  *
  31  * \author Ian Romanick <idr@us.ibm.com>
  32  */
  33
  34 #include <GL/glx.h>
  35 #include "GL/glxint.h"
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #include "glcontextmodes.h"
  40
  41 #define NUM_VISUAL_TYPES   6
  42
  43 /**
  44  * Convert an X visual type to a GLX visual type.
  45  *
  46  * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
  47  *        to be converted.
  48  * \return If \c visualType is a valid X visual type, a GLX visual type will
  49  *         be returned.  Otherwise \c GLX_NONE will be returned.
  50  */
  51 GLint
  52 _gl_convert_from_x_visual_type(int visualType)
  53 {
  54    static const int glx_visual_types[NUM_VISUAL_TYPES] = {
  55       GLX_STATIC_GRAY, GLX_GRAY_SCALE,
  56       GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
  57       GLX_TRUE_COLOR, GLX_DIRECT_COLOR
  58    };
  59
  60    return ((unsigned) visualType < NUM_VISUAL_TYPES)
  61       ? glx_visual_types[visualType] : GLX_NONE;
  62 }
  63
  64
  65 /**
  66  * Convert a GLX visual type to an X visual type.
  67  *
  68  * \param visualType GLX visual type (i.e., \c GLX_TRUE_COLOR,
  69  *                   \c GLX_STATIC_GRAY, etc.) to be converted.
  70  * \return If \c visualType is a valid GLX visual type, an X visual type will
  71  *         be returned.  Otherwise -1 will be returned.
  72  */
  73 GLint
  74 _gl_convert_to_x_visual_type(int visualType)
  75 {
  76    static const int x_visual_types[NUM_VISUAL_TYPES] = {
  77       TrueColor, DirectColor,
  78       PseudoColor, StaticColor,
  79       GrayScale, StaticGray
  80    };
  81
  82    return ((unsigned) (visualType - GLX_TRUE_COLOR) < NUM_VISUAL_TYPES)
  83       ? x_visual_types[visualType - GLX_TRUE_COLOR] : -1;
  84 }
  85
  86
  87 /**
  88  * Copy a GLX visual config structure to a GL context mode structure.  All
  89  * of the fields in \c config are copied to \c mode.  Additional fields in
  90  * \c mode that can be derrived from the fields of \c config (i.e.,
  91  * \c haveDepthBuffer) are also filled in.  The remaining fields in \c mode
  92  * that cannot be derived are set to default values.
  93  *
  94  * \param mode   Destination GL context mode.
  95  * \param config Source GLX visual config.
  96  *
  97  * \note
  98  * The \c fbconfigID and \c visualID fields of the \c __GLcontextModes
  99  * structure will be set to the \c vid of the \c __GLXvisualConfig structure.
 100  */
 101 void
 102 _gl_copy_visual_to_context_mode(__GLcontextModes * mode,
 103                                 const __GLXvisualConfig * config)
 104 {
 105    __GLcontextModes *const next = mode->next;
 106
 107    (void) memset(mode, 0, sizeof(__GLcontextModes));
 108    mode->next = next;
 109
 110    mode->visualID = config->vid;
 111    mode->visualType = _gl_convert_from_x_visual_type(config->class);
 112    mode->xRenderable = GL_TRUE;
 113    mode->fbconfigID = config->vid;
 114    mode->drawableType = GLX_WINDOW_BIT | GLX_PIXMAP_BIT;
 115
 116    mode->rgbMode = (config->rgba != 0);
 117    mode->renderType = (mode->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
 118
 119    mode->colorIndexMode = !(mode->rgbMode);
 120    mode->doubleBufferMode = (config->doubleBuffer != 0);
 121    mode->stereoMode = (config->stereo != 0);
 122
 123    mode->haveAccumBuffer = ((config->accumRedSize +
 124                              config->accumGreenSize +
 125                              config->accumBlueSize +
 126                              config->accumAlphaSize) > 0);
 127    mode->haveDepthBuffer = (config->depthSize > 0);
 128    mode->haveStencilBuffer = (config->stencilSize > 0);
 129
 130    mode->redBits = config->redSize;
 131    mode->greenBits = config->greenSize;
 132    mode->blueBits = config->blueSize;
 133    mode->alphaBits = config->alphaSize;
 134    mode->redMask = config->redMask;
 135    mode->greenMask = config->greenMask;
 136    mode->blueMask = config->blueMask;
 137    mode->alphaMask = config->alphaMask;
 138    mode->rgbBits = mode->rgbMode ? config->bufferSize : 0;
 139    mode->indexBits = mode->colorIndexMode ? config->bufferSize : 0;
 140
 141    mode->accumRedBits = config->accumRedSize;
 142    mode->accumGreenBits = config->accumGreenSize;
 143    mode->accumBlueBits = config->accumBlueSize;
 144    mode->accumAlphaBits = config->accumAlphaSize;
 145    mode->depthBits = config->depthSize;
 146    mode->stencilBits = config->stencilSize;
 147
 148    mode->numAuxBuffers = config->auxBuffers;
 149    mode->level = config->level;
 150
 151    mode->visualRating = config->visualRating;
 152    mode->transparentPixel = config->transparentPixel;
 153    mode->transparentRed = config->transparentRed;
 154    mode->transparentGreen = config->transparentGreen;
 155    mode->transparentBlue = config->transparentBlue;
 156    mode->transparentAlpha = config->transparentAlpha;
 157    mode->transparentIndex = config->transparentIndex;
 158    mode->samples = config->multiSampleSize;
 159    mode->sampleBuffers = config->nMultiSampleBuffers;
 160    /* mode->visualSelectGroup = config->visualSelectGroup; ? */
 161
 162    mode->swapMethod = GLX_SWAP_UNDEFINED_OML;
 163
 164    mode->bindToTextureRgb = (mode->rgbMode) ? GL_TRUE : GL_FALSE;
 165    mode->bindToTextureRgba = (mode->rgbMode && mode->alphaBits) ?
 166       GL_TRUE : GL_FALSE;
 167    mode->bindToMipmapTexture = mode->rgbMode ? GL_TRUE : GL_FALSE;
 168    mode->bindToTextureTargets = mode->rgbMode ?
 169       GLX_TEXTURE_1D_BIT_EXT | GLX_TEXTURE_2D_BIT_EXT |
 170       GLX_TEXTURE_RECTANGLE_BIT_EXT : 0;
 171    mode->yInverted = GL_FALSE;
 172 }
 173
 174
 175 /**
 176  * Get data from a GL context mode.
 177  *
 178  * \param mode         GL context mode whose data is to be returned.
 179  * \param attribute    Attribute of \c mode that is to be returned.
 180  * \param value_return Location to store the data member of \c mode.
 181  * \return  If \c attribute is a valid attribute of \c mode, zero is
 182  *          returned.  Otherwise \c GLX_BAD_ATTRIBUTE is returned.
 183  */
 184 int
 185 _gl_get_context_mode_data(const __GLcontextModes * mode, int attribute,
 186                           int *value_return)
 187 {
 188    switch (attribute) {
 189    case GLX_USE_GL:
 190       *value_return = GL_TRUE;
 191       return 0;
 192    case GLX_BUFFER_SIZE:
 193       *value_return = mode->rgbBits;
 194       return 0;
 195    case GLX_RGBA:
 196       *value_return = mode->rgbMode;
 197       return 0;
 198    case GLX_RED_SIZE:
 199       *value_return = mode->redBits;
 200       return 0;
 201    case GLX_GREEN_SIZE:
 202       *value_return = mode->greenBits;
 203       return 0;
 204    case GLX_BLUE_SIZE:
 205       *value_return = mode->blueBits;
 206       return 0;
 207    case GLX_ALPHA_SIZE:
 208       *value_return = mode->alphaBits;
 209       return 0;
 210    case GLX_DOUBLEBUFFER:
 211       *value_return = mode->doubleBufferMode;
 212       return 0;
 213    case GLX_STEREO:
 214       *value_return = mode->stereoMode;
 215       return 0;
 216    case GLX_AUX_BUFFERS:
 217       *value_return = mode->numAuxBuffers;
 218       return 0;
 219    case GLX_DEPTH_SIZE:
 220       *value_return = mode->depthBits;
 221       return 0;
 222    case GLX_STENCIL_SIZE:
 223       *value_return = mode->stencilBits;
 224       return 0;
 225    case GLX_ACCUM_RED_SIZE:
 226       *value_return = mode->accumRedBits;
 227       return 0;
 228    case GLX_ACCUM_GREEN_SIZE:
 229       *value_return = mode->accumGreenBits;
 230       return 0;
 231    case GLX_ACCUM_BLUE_SIZE:
 232       *value_return = mode->accumBlueBits;
 233       return 0;
 234    case GLX_ACCUM_ALPHA_SIZE:
 235       *value_return = mode->accumAlphaBits;
 236       return 0;
 237    case GLX_LEVEL:
 238       *value_return = mode->level;
 239       return 0;
 240    case GLX_TRANSPARENT_TYPE_EXT:
 241       *value_return = mode->transparentPixel;
 242       return 0;
 243    case GLX_TRANSPARENT_RED_VALUE:
 244       *value_return = mode->transparentRed;
 245       return 0;
 246    case GLX_TRANSPARENT_GREEN_VALUE:
 247       *value_return = mode->transparentGreen;
 248       return 0;
 249    case GLX_TRANSPARENT_BLUE_VALUE:
 250       *value_return = mode->transparentBlue;
 251       return 0;
 252    case GLX_TRANSPARENT_ALPHA_VALUE:
 253       *value_return = mode->transparentAlpha;
 254       return 0;
 255    case GLX_TRANSPARENT_INDEX_VALUE:
 256       *value_return = mode->transparentIndex;
 257       return 0;
 258    case GLX_X_VISUAL_TYPE:
 259       *value_return = mode->visualType;
 260       return 0;
 261    case GLX_CONFIG_CAVEAT:
 262       *value_return = mode->visualRating;
 263       return 0;
 264    case GLX_VISUAL_ID:
 265       *value_return = mode->visualID;
 266       return 0;
 267    case GLX_DRAWABLE_TYPE:
 268       *value_return = mode->drawableType;
 269       return 0;
 270    case GLX_RENDER_TYPE:
 271       *value_return = mode->renderType;
 272       return 0;
 273    case GLX_X_RENDERABLE:
 274       *value_return = mode->xRenderable;
 275       return 0;
 276    case GLX_FBCONFIG_ID:
 277       *value_return = mode->fbconfigID;
 278       return 0;
 279    case GLX_MAX_PBUFFER_WIDTH:
 280       *value_return = mode->maxPbufferWidth;
 281       return 0;
 282    case GLX_MAX_PBUFFER_HEIGHT:
 283       *value_return = mode->maxPbufferHeight;
 284       return 0;
 285    case GLX_MAX_PBUFFER_PIXELS:
 286       *value_return = mode->maxPbufferPixels;
 287       return 0;
 288    case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
 289       *value_return = mode->optimalPbufferWidth;
 290       return 0;
 291    case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
 292       *value_return = mode->optimalPbufferHeight;
 293       return 0;
 294    case GLX_SWAP_METHOD_OML:
 295       *value_return = mode->swapMethod;
 296       return 0;
 297    case GLX_SAMPLE_BUFFERS_SGIS:
 298       *value_return = mode->sampleBuffers;
 299       return 0;
 300    case GLX_SAMPLES_SGIS:
 301       *value_return = mode->samples;
 302       return 0;
 303    case GLX_BIND_TO_TEXTURE_RGB_EXT:
 304       *value_return = mode->bindToTextureRgb;
 305       return 0;
 306    case GLX_BIND_TO_TEXTURE_RGBA_EXT:
 307       *value_return = mode->bindToTextureRgba;
 308       return 0;
 309    case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
 310       *value_return = mode->bindToMipmapTexture == GL_TRUE ? GL_TRUE :
 311          GL_FALSE;
 312       return 0;
 313    case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
 314       *value_return = mode->bindToTextureTargets;
 315       return 0;
 316    case GLX_Y_INVERTED_EXT:
 317       *value_return = mode->yInverted;
 318       return 0;
 319
 320       /* Applications are NOT allowed to query GLX_VISUAL_SELECT_GROUP_SGIX.
 321        * It is ONLY for communication between the GLX client and the GLX
 322        * server.
 323        */
 324    case GLX_VISUAL_SELECT_GROUP_SGIX:
 325    default:
 326       return GLX_BAD_ATTRIBUTE;
 327    }
 328 }
 329
 330
 331 /**
 332  * Allocate a linked list of \c __GLcontextModes structures.  The fields of
 333  * each structure will be initialized to "reasonable" default values.  In
 334  * most cases this is the default value defined by table 3.4 of the GLX
 335  * 1.3 specification.  This means that most values are either initialized to
 336  * zero or \c GLX_DONT_CARE (which is -1).  As support for additional
 337  * extensions is added, the new values will be initialized to appropriate
 338  * values from the extension specification.
 339  *
 340  * \param count         Number of structures to allocate.
 341  * \param minimum_size  Minimum size of a structure to allocate.  This allows
 342  *                      for differences in the version of the
 343  *                      \c __GLcontextModes stucture used in libGL and in a
 344  *                      DRI-based driver.
 345  * \returns A pointer to the first element in a linked list of \c count
 346  *          stuctures on success, or \c NULL on failure.
 347  *
 348  * \warning Use of \c minimum_size does \b not guarantee binary compatibility.
 349  *          The fundamental assumption is that if the \c minimum_size
 350  *          specified by the driver and the size of the \c __GLcontextModes
 351  *          structure in libGL is the same, then the meaning of each byte in
 352  *          the structure is the same in both places.  \b Be \b careful!
 353  *          Basically this means that fields have to be added in libGL and
 354  *          then propagated to drivers.  Drivers should \b never arbitrarilly
 355  *          extend the \c __GLcontextModes data-structure.
 356  */
 357 __GLcontextModes *
 358 _gl_context_modes_create(unsigned count, size_t minimum_size)
 359 {
 360    const size_t size = (minimum_size > sizeof(__GLcontextModes))
 361       ? minimum_size : sizeof(__GLcontextModes);
 362    __GLcontextModes *base = NULL;
 363    __GLcontextModes **next;
 364    unsigned i;
 365
 366    next = &base;
 367    for (i = 0; i < count; i++) {
 368       *next = (__GLcontextModes *) malloc(size);
 369       if (*next == NULL) {
 370          _gl_context_modes_destroy(base);
 371          base = NULL;
 372          break;
 373       }
 374
 375       (void) memset(*next, 0, size);
 376       (*next)->visualID = GLX_DONT_CARE;
 377       (*next)->visualType = GLX_DONT_CARE;
 378       (*next)->visualRating = GLX_NONE;
 379       (*next)->transparentPixel = GLX_NONE;
 380       (*next)->transparentRed = GLX_DONT_CARE;
 381       (*next)->transparentGreen = GLX_DONT_CARE;
 382       (*next)->transparentBlue = GLX_DONT_CARE;
 383       (*next)->transparentAlpha = GLX_DONT_CARE;
 384       (*next)->transparentIndex = GLX_DONT_CARE;
 385       (*next)->xRenderable = GLX_DONT_CARE;
 386       (*next)->fbconfigID = GLX_DONT_CARE;
 387       (*next)->swapMethod = GLX_SWAP_UNDEFINED_OML;
 388       (*next)->bindToTextureRgb = GLX_DONT_CARE;
 389       (*next)->bindToTextureRgba = GLX_DONT_CARE;
 390       (*next)->bindToMipmapTexture = GLX_DONT_CARE;
 391       (*next)->bindToTextureTargets = GLX_DONT_CARE;
 392       (*next)->yInverted = GLX_DONT_CARE;
 393
 394       next = &((*next)->next);
 395    }
 396
 397    return base;
 398 }
 399
 400
 401 /**
 402  * Destroy a linked list of \c __GLcontextModes structures created by
 403  * \c _gl_context_modes_create.
 404  *
 405  * \param modes  Linked list of structures to be destroyed.  All structres
 406  *               in the list will be freed.
 407  */
 408 void
 409 _gl_context_modes_destroy(__GLcontextModes * modes)
 410 {
 411    while (modes != NULL) {
 412       __GLcontextModes *const next = modes->next;
 413
 414       free(modes);
 415       modes = next;
 416    }
 417 }
 418
 419
 420 /**
 421  * Find a context mode matching a Visual ID.
 422  *
 423  * \param modes  List list of context-mode structures to be searched.
 424  * \param vid    Visual ID to be found.
 425  * \returns A pointer to a context-mode in \c modes if \c vid was found in
 426  *          the list, or \c NULL if it was not.
 427  */
 428
 429 __GLcontextModes *
 430 _gl_context_modes_find_visual(__GLcontextModes * modes, int vid)
 431 {
 432    __GLcontextModes *m;
 433
 434    for (m = modes; m != NULL; m = m->next)
 435       if (m->visualID == vid)
 436          return m;
 437
 438    return NULL;
 439 }
 440
 441 __GLcontextModes *
 442 _gl_context_modes_find_fbconfig(__GLcontextModes * modes, int fbid)
 443 {
 444    __GLcontextModes *m;
 445
 446    for (m = modes; m != NULL; m = m->next)
 447       if (m->fbconfigID == fbid)
 448          return m;
 449
 450    return NULL;
 451 }
 452
 453 /**
 454  * Determine if two context-modes are the same.  This is intended to be used
 455  * by libGL implementations to compare to sets of driver generated FBconfigs.
 456  *
 457  * \param a  Context-mode to be compared.
 458  * \param b  Context-mode to be compared.
 459  * \returns \c GL_TRUE if the two context-modes are the same.  \c GL_FALSE is
 460  *          returned otherwise.
 461  */
 462 GLboolean
 463 _gl_context_modes_are_same(const __GLcontextModes * a,
 464                            const __GLcontextModes * b)
 465 {
 466    return ((a->rgbMode == b->rgbMode) &&
 467            (a->floatMode == b->floatMode) &&
 468            (a->colorIndexMode == b->colorIndexMode) &&
 469            (a->doubleBufferMode == b->doubleBufferMode) &&
 470            (a->stereoMode == b->stereoMode) &&
 471            (a->redBits == b->redBits) &&
 472            (a->greenBits == b->greenBits) &&
 473            (a->blueBits == b->blueBits) && (a->alphaBits == b->alphaBits) &&
 474 #if 0                           /* For some reason these don't get set on the client-side in libGL. */
 475            (a->redMask == b->redMask) &&
 476            (a->greenMask == b->greenMask) &&
 477            (a->blueMask == b->blueMask) && (a->alphaMask == b->alphaMask) &&
 478 #endif
 479            (a->rgbBits == b->rgbBits) &&
 480            (a->indexBits == b->indexBits) &&
 481            (a->accumRedBits == b->accumRedBits) &&
 482            (a->accumGreenBits == b->accumGreenBits) &&
 483            (a->accumBlueBits == b->accumBlueBits) &&
 484            (a->accumAlphaBits == b->accumAlphaBits) &&
 485            (a->depthBits == b->depthBits) &&
 486            (a->stencilBits == b->stencilBits) &&
 487            (a->numAuxBuffers == b->numAuxBuffers) &&
 488            (a->level == b->level) &&
 489            (a->pixmapMode == b->pixmapMode) &&
 490            (a->visualRating == b->visualRating) &&
 491            (a->transparentPixel == b->transparentPixel) &&
 492            ((a->transparentPixel != GLX_TRANSPARENT_RGB) ||
 493             ((a->transparentRed == b->transparentRed) &&
 494              (a->transparentGreen == b->transparentGreen) &&
 495              (a->transparentBlue == b->transparentBlue) &&
 496              (a->transparentAlpha == b->transparentAlpha))) &&
 497            ((a->transparentPixel != GLX_TRANSPARENT_INDEX) ||
 498             (a->transparentIndex == b->transparentIndex)) &&
 499            (a->sampleBuffers == b->sampleBuffers) &&
 500            (a->samples == b->samples) &&
 501            ((a->drawableType & b->drawableType) != 0) &&
 502            (a->renderType == b->renderType) &&
 503            (a->maxPbufferWidth == b->maxPbufferWidth) &&
 504            (a->maxPbufferHeight == b->maxPbufferHeight) &&
 505            (a->maxPbufferPixels == b->maxPbufferPixels) &&
 506            (a->optimalPbufferWidth == b->optimalPbufferWidth) &&
 507            (a->optimalPbufferHeight == b->optimalPbufferHeight) &&
 508            (a->swapMethod == b->swapMethod) &&
 509            (a->bindToTextureRgb == b->bindToTextureRgb) &&
 510            (a->bindToTextureRgba == b->bindToTextureRgba) &&
 511            (a->bindToMipmapTexture == b->bindToMipmapTexture) &&
 512            (a->bindToTextureTargets == b->bindToTextureTargets) &&
 513            (a->yInverted == b->yInverted));
 514 }