src/mesa/drivers/dri/common/drisw_util.c

   1 /*
   2  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
   3  * All Rights Reserved.
   4  * Copyright 2010 George Sapountzis <gsapountzis@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file drisw_util.c
  26  *
  27  * DRISW utility functions, i.e. dri_util.c stripped from drm-specific bits.
  28  */
  29
  30 #include "dri_util.h"
  31 #include "utils.h"
  32
  33
  34 /**
  35  * Screen functions
  36  */
  37
  38 static void
  39 setupLoaderExtensions(__DRIscreen *psp,
  40                       const __DRIextension **extensions)
  41 {
  42     int i;
  43
  44     for (i = 0; extensions[i]; i++) {
  45         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  46             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  47     }
  48 }
  49
  50 static __DRIscreen *
  51 driCreateNewScreen(int scrn, const __DRIextension **extensions,
  52                    const __DRIconfig ***driver_configs, void *data)
  53 {
  54     static const __DRIextension *emptyExtensionList[] = { NULL };
  55     __DRIscreen *psp;
  56
  57     psp = CALLOC_STRUCT(__DRIscreenRec);
  58     if (!psp)
  59         return NULL;
  60
  61     setupLoaderExtensions(psp, extensions);
  62
  63     psp->loaderPrivate = data;
  64
  65     psp->extensions = emptyExtensionList;
  66     psp->fd = -1;
  67     psp->myNum = scrn;
  68
  69     *driver_configs = driDriverAPI.InitScreen(psp);
  70     if (*driver_configs == NULL) {
  71         free(psp);
  72         return NULL;
  73     }
  74
  75     return psp;
  76 }
  77
  78 static void driDestroyScreen(__DRIscreen *psp)
  79 {
  80     if (psp) {
  81         driDriverAPI.DestroyScreen(psp);
  82         free(psp);
  83     }
  84 }
  85
  86 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
  87 {
  88     return psp->extensions;
  89 }
  90
  91
  92 /**
  93  * Context functions
  94  */
  95
  96 static __DRIcontext *
  97 driCreateContextAttribs(__DRIscreen *screen, int api,
  98                         const __DRIconfig *config,
  99                         __DRIcontext *shared,
 100                         unsigned num_attribs,
 101                         const uint32_t *attribs,
 102                         unsigned *error,
 103                         void *data)
 104 {
 105     __DRIcontext *pcp;
 106     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 107     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 108     gl_api mesa_api;
 109     unsigned major_version = 1;
 110     unsigned minor_version = 0;
 111     uint32_t flags = 0;
 112
 113     /* Either num_attribs is zero and attribs is NULL, or num_attribs is not
 114      * zero and attribs is not NULL.
 115      */
 116     assert((num_attribs == 0) == (attribs == NULL));
 117
 118     switch (api) {
 119     case __DRI_API_OPENGL:
 120             mesa_api = API_OPENGL_COMPAT;
 121             break;
 122     case __DRI_API_GLES:
 123             mesa_api = API_OPENGLES;
 124             break;
 125     case __DRI_API_GLES2:
 126     case __DRI_API_GLES3:
 127             mesa_api = API_OPENGLES2;
 128             break;
 129     case __DRI_API_OPENGL_CORE:
 130             mesa_api = API_OPENGL_CORE;
 131             break;
 132     default:
 133             *error = __DRI_CTX_ERROR_BAD_API;
 134             return NULL;
 135     }
 136
 137     for (unsigned i = 0; i < num_attribs; i++) {
 138         switch (attribs[i * 2]) {
 139         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 140             major_version = attribs[i * 2 + 1];
 141             break;
 142         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 143             minor_version = attribs[i * 2 + 1];
 144             break;
 145         case __DRI_CTX_ATTRIB_FLAGS:
 146             flags = attribs[i * 2 + 1];
 147             break;
 148         default:
 149             /* We can't create a context that satisfies the requirements of an
 150              * attribute that we don't understand.  Return failure.
 151              */
 152             return NULL;
 153         }
 154     }
 155
 156     /* Mesa does not support the GL_ARB_compatibilty extension or the
 157      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 158      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 159      */
 160     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 161        mesa_api = API_OPENGL_CORE;
 162
 163     if (mesa_api == API_OPENGL_COMPAT
 164         && ((major_version > 3)
 165             || (major_version == 3 && minor_version >= 2))) {
 166        *error = __DRI_CTX_ERROR_BAD_API;
 167        return NULL;
 168     }
 169     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 170      * GLX_ARB_create_context spec says:
 171      *
 172      *     "Forward-compatible contexts are defined only for OpenGL versions
 173      *     3.0 and later."
 174      *
 175      * Moreover, Mesa can't fulfill the requirements of a forward-looking
 176      * context.  Return failure if a forward-looking context is requested.
 177      *
 178      * In Mesa, a debug context is the same as a regular context.
 179      */
 180     if (major_version >= 3) {
 181         if ((flags & ~__DRI_CTX_FLAG_DEBUG) != 0)
 182             return NULL;
 183     }
 184
 185     pcp = CALLOC_STRUCT(__DRIcontextRec);
 186     if (!pcp)
 187         return NULL;
 188
 189     pcp->loaderPrivate = data;
 190
 191     pcp->driScreenPriv = screen;
 192     pcp->driDrawablePriv = NULL;
 193     pcp->driReadablePriv = NULL;
 194
 195     if (!driDriverAPI.CreateContext(mesa_api, modes, pcp,
 196                                     major_version, minor_version,
 197                                     flags, error, shareCtx)) {
 198         free(pcp);
 199         return NULL;
 200     }
 201
 202     return pcp;
 203 }
 204
 205 static __DRIcontext *
 206 driCreateNewContextForAPI(__DRIscreen *psp, int api,
 207                           const __DRIconfig *config,
 208                           __DRIcontext *shared, void *data)
 209 {
 210     unsigned error;
 211
 212     return driCreateContextAttribs(psp, api, config, shared, 0, NULL,
 213                                    &error, data);
 214 }
 215
 216 static __DRIcontext *
 217 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 218                     __DRIcontext *shared, void *data)
 219 {
 220     return driCreateNewContextForAPI(psp, __DRI_API_OPENGL,
 221                                      config, shared, data);
 222 }
 223
 224 static void
 225 driDestroyContext(__DRIcontext *pcp)
 226 {
 227     if (pcp) {
 228         driDriverAPI.DestroyContext(pcp);
 229         free(pcp);
 230     }
 231 }
 232
 233 static int
 234 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 235 {
 236     return GL_FALSE;
 237 }
 238
 239 static void dri_get_drawable(__DRIdrawable *pdp);
 240 static void dri_put_drawable(__DRIdrawable *pdp);
 241
 242 static int driBindContext(__DRIcontext *pcp,
 243                           __DRIdrawable *pdp,
 244                           __DRIdrawable *prp)
 245 {
 246     /* Bind the drawable to the context */
 247     if (pcp) {
 248         pcp->driDrawablePriv = pdp;
 249         pcp->driReadablePriv = prp;
 250         if (pdp) {
 251             pdp->driContextPriv = pcp;
 252             dri_get_drawable(pdp);
 253         }
 254         if (prp && pdp != prp) {
 255             dri_get_drawable(prp);
 256         }
 257     }
 258
 259     return driDriverAPI.MakeCurrent(pcp, pdp, prp);
 260 }
 261
 262 static int driUnbindContext(__DRIcontext *pcp)
 263 {
 264     __DRIdrawable *pdp;
 265     __DRIdrawable *prp;
 266
 267     if (pcp == NULL)
 268         return GL_FALSE;
 269
 270     pdp = pcp->driDrawablePriv;
 271     prp = pcp->driReadablePriv;
 272
 273     /* already unbound */
 274     if (!pdp && !prp)
 275         return GL_TRUE;
 276
 277     driDriverAPI.UnbindContext(pcp);
 278
 279     dri_put_drawable(pdp);
 280
 281     if (prp != pdp) {
 282         dri_put_drawable(prp);
 283     }
 284
 285     pcp->driDrawablePriv = NULL;
 286     pcp->driReadablePriv = NULL;
 287
 288     return GL_TRUE;
 289 }
 290
 291
 292 /**
 293  * Drawable functions
 294  */
 295
 296 static void dri_get_drawable(__DRIdrawable *pdp)
 297 {
 298     pdp->refcount++;
 299 }
 300
 301 static void dri_put_drawable(__DRIdrawable *pdp)
 302 {
 303     if (pdp) {
 304         pdp->refcount--;
 305         if (pdp->refcount)
 306             return;
 307
 308         driDriverAPI.DestroyBuffer(pdp);
 309         free(pdp);
 310     }
 311 }
 312
 313 static __DRIdrawable *
 314 driCreateNewDrawable(__DRIscreen *psp,
 315                      const __DRIconfig *config, void *data)
 316 {
 317     __DRIdrawable *pdp;
 318
 319     pdp = CALLOC_STRUCT(__DRIdrawableRec);
 320     if (!pdp)
 321         return NULL;
 322
 323     pdp->loaderPrivate = data;
 324
 325     pdp->driScreenPriv = psp;
 326     pdp->driContextPriv = NULL;
 327
 328     dri_get_drawable(pdp);
 329
 330     if (!driDriverAPI.CreateBuffer(psp, pdp, &config->modes, GL_FALSE)) {
 331         free(pdp);
 332         return NULL;
 333     }
 334
 335     pdp->lastStamp = 1; /* const */
 336
 337     return pdp;
 338 }
 339
 340 static void
 341 driDestroyDrawable(__DRIdrawable *pdp)
 342 {
 343     dri_put_drawable(pdp);
 344 }
 345
 346 static void driSwapBuffers(__DRIdrawable *pdp)
 347 {
 348     driDriverAPI.SwapBuffers(pdp);
 349 }
 350
 351 const __DRIcoreExtension driCoreExtension = {
 352     { __DRI_CORE, __DRI_CORE_VERSION },
 353     NULL, /* driCreateNewScreen */
 354     driDestroyScreen,
 355     driGetExtensions,
 356     driGetConfigAttrib,
 357     driIndexConfigAttrib,
 358     NULL, /* driCreateNewDrawable */
 359     driDestroyDrawable,
 360     driSwapBuffers,
 361     driCreateNewContext,
 362     driCopyContext,
 363     driDestroyContext,
 364     driBindContext,
 365     driUnbindContext
 366 };
 367
 368 const __DRIswrastExtension driSWRastExtension = {
 369     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 370     driCreateNewScreen,
 371     driCreateNewDrawable,
 372     driCreateNewContextForAPI,
 373     driCreateContextAttribs
 374 };