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 OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file drisw_util.c
  27  *
  28  * DRISW utility functions, i.e. dri_util.c stripped from drm-specific bits.
  29  */
  30
  31 #include "dri_util.h"
  32 #include "utils.h"
  33
  34
  35 /**
  36  * Screen functions
  37  */
  38
  39 static void
  40 setupLoaderExtensions(__DRIscreen *psp,
  41                       const __DRIextension **extensions)
  42 {
  43     int i;
  44
  45     for (i = 0; extensions[i]; i++) {
  46         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
  47             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
  48     }
  49 }
  50
  51 static __DRIscreen *
  52 driCreateNewScreen(int scrn, const __DRIextension **extensions,
  53                    const __DRIconfig ***driver_configs, void *data)
  54 {
  55     static const __DRIextension *emptyExtensionList[] = { NULL };
  56     __DRIscreen *psp;
  57
  58     psp = CALLOC_STRUCT(__DRIscreenRec);
  59     if (!psp)
  60         return NULL;
  61
  62     setupLoaderExtensions(psp, extensions);
  63
  64     psp->loaderPrivate = data;
  65
  66     psp->extensions = emptyExtensionList;
  67     psp->fd = -1;
  68     psp->myNum = scrn;
  69
  70     *driver_configs = driDriverAPI.InitScreen(psp);
  71     if (*driver_configs == NULL) {
  72         free(psp);
  73         return NULL;
  74     }
  75
  76     return psp;
  77 }
  78
  79 static void driDestroyScreen(__DRIscreen *psp)
  80 {
  81     if (psp) {
  82         driDriverAPI.DestroyScreen(psp);
  83         free(psp);
  84     }
  85 }
  86
  87 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
  88 {
  89     return psp->extensions;
  90 }
  91
  92
  93 /**
  94  * Context functions
  95  */
  96
  97 static __DRIcontext *
  98 driCreateContextAttribs(__DRIscreen *screen, int api,
  99                         const __DRIconfig *config,
 100                         __DRIcontext *shared,
 101                         unsigned num_attribs,
 102                         const uint32_t *attribs,
 103                         unsigned *error,
 104                         void *data)
 105 {
 106     __DRIcontext *pcp;
 107     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
 108     void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
 109     gl_api mesa_api;
 110     unsigned major_version = 1;
 111     unsigned minor_version = 0;
 112     uint32_t flags = 0;
 113
 114     /* Either num_attribs is zero and attribs is NULL, or num_attribs is not
 115      * zero and attribs is not NULL.
 116      */
 117     assert((num_attribs == 0) == (attribs == NULL));
 118
 119     switch (api) {
 120     case __DRI_API_OPENGL:
 121             mesa_api = API_OPENGL_COMPAT;
 122             break;
 123     case __DRI_API_GLES:
 124             mesa_api = API_OPENGLES;
 125             break;
 126     case __DRI_API_GLES2:
 127     case __DRI_API_GLES3:
 128             mesa_api = API_OPENGLES2;
 129             break;
 130     case __DRI_API_OPENGL_CORE:
 131             mesa_api = API_OPENGL_CORE;
 132             break;
 133     default:
 134             *error = __DRI_CTX_ERROR_BAD_API;
 135             return NULL;
 136     }
 137
 138     for (unsigned i = 0; i < num_attribs; i++) {
 139         switch (attribs[i * 2]) {
 140         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 141             major_version = attribs[i * 2 + 1];
 142             break;
 143         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 144             minor_version = attribs[i * 2 + 1];
 145             break;
 146         case __DRI_CTX_ATTRIB_FLAGS:
 147             flags = attribs[i * 2 + 1];
 148             break;
 149         default:
 150             /* We can't create a context that satisfies the requirements of an
 151              * attribute that we don't understand.  Return failure.
 152              */
 153             return NULL;
 154         }
 155     }
 156
 157     /* Mesa does not support the GL_ARB_compatibilty extension or the
 158      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
 159      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
 160      */
 161     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
 162        mesa_api = API_OPENGL_CORE;
 163
 164     if (mesa_api == API_OPENGL_COMPAT
 165         && ((major_version > 3)
 166             || (major_version == 3 && minor_version >= 2))) {
 167        *error = __DRI_CTX_ERROR_BAD_API;
 168        return NULL;
 169     }
 170     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 171      * GLX_ARB_create_context spec says:
 172      *
 173      *     "Forward-compatible contexts are defined only for OpenGL versions
 174      *     3.0 and later."
 175      *
 176      * Moreover, Mesa can't fulfill the requirements of a forward-looking
 177      * context.  Return failure if a forward-looking context is requested.
 178      *
 179      * In Mesa, a debug context is the same as a regular context.
 180      */
 181     if (major_version >= 3) {
 182         if ((flags & ~__DRI_CTX_FLAG_DEBUG) != 0)
 183             return NULL;
 184     }
 185
 186     pcp = CALLOC_STRUCT(__DRIcontextRec);
 187     if (!pcp)
 188         return NULL;
 189
 190     pcp->loaderPrivate = data;
 191
 192     pcp->driScreenPriv = screen;
 193     pcp->driDrawablePriv = NULL;
 194     pcp->driReadablePriv = NULL;
 195
 196     if (!driDriverAPI.CreateContext(mesa_api, modes, pcp,
 197                                     major_version, minor_version,
 198                                     flags, error, shareCtx)) {
 199         free(pcp);
 200         return NULL;
 201     }
 202
 203     return pcp;
 204 }
 205
 206 static __DRIcontext *
 207 driCreateNewContextForAPI(__DRIscreen *psp, int api,
 208                           const __DRIconfig *config,
 209                           __DRIcontext *shared, void *data)
 210 {
 211     unsigned error;
 212
 213     return driCreateContextAttribs(psp, api, config, shared, 0, NULL,
 214                                    &error, data);
 215 }
 216
 217 static __DRIcontext *
 218 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 219                     __DRIcontext *shared, void *data)
 220 {
 221     return driCreateNewContextForAPI(psp, __DRI_API_OPENGL,
 222                                      config, shared, data);
 223 }
 224
 225 static void
 226 driDestroyContext(__DRIcontext *pcp)
 227 {
 228     if (pcp) {
 229         driDriverAPI.DestroyContext(pcp);
 230         free(pcp);
 231     }
 232 }
 233
 234 static int
 235 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 236 {
 237     return GL_FALSE;
 238 }
 239
 240 static void dri_get_drawable(__DRIdrawable *pdp);
 241 static void dri_put_drawable(__DRIdrawable *pdp);
 242
 243 static int driBindContext(__DRIcontext *pcp,
 244                           __DRIdrawable *pdp,
 245                           __DRIdrawable *prp)
 246 {
 247     /* Bind the drawable to the context */
 248     if (pcp) {
 249         pcp->driDrawablePriv = pdp;
 250         pcp->driReadablePriv = prp;
 251         if (pdp) {
 252             pdp->driContextPriv = pcp;
 253             dri_get_drawable(pdp);
 254         }
 255         if (prp && pdp != prp) {
 256             dri_get_drawable(prp);
 257         }
 258     }
 259
 260     return driDriverAPI.MakeCurrent(pcp, pdp, prp);
 261 }
 262
 263 static int driUnbindContext(__DRIcontext *pcp)
 264 {
 265     __DRIdrawable *pdp;
 266     __DRIdrawable *prp;
 267
 268     if (pcp == NULL)
 269         return GL_FALSE;
 270
 271     pdp = pcp->driDrawablePriv;
 272     prp = pcp->driReadablePriv;
 273
 274     /* already unbound */
 275     if (!pdp && !prp)
 276         return GL_TRUE;
 277
 278     driDriverAPI.UnbindContext(pcp);
 279
 280     dri_put_drawable(pdp);
 281
 282     if (prp != pdp) {
 283         dri_put_drawable(prp);
 284     }
 285
 286     pcp->driDrawablePriv = NULL;
 287     pcp->driReadablePriv = NULL;
 288
 289     return GL_TRUE;
 290 }
 291
 292
 293 /**
 294  * Drawable functions
 295  */
 296
 297 static void dri_get_drawable(__DRIdrawable *pdp)
 298 {
 299     pdp->refcount++;
 300 }
 301
 302 static void dri_put_drawable(__DRIdrawable *pdp)
 303 {
 304     if (pdp) {
 305         pdp->refcount--;
 306         if (pdp->refcount)
 307             return;
 308
 309         driDriverAPI.DestroyBuffer(pdp);
 310         free(pdp);
 311     }
 312 }
 313
 314 static __DRIdrawable *
 315 driCreateNewDrawable(__DRIscreen *psp,
 316                      const __DRIconfig *config, void *data)
 317 {
 318     __DRIdrawable *pdp;
 319
 320     pdp = CALLOC_STRUCT(__DRIdrawableRec);
 321     if (!pdp)
 322         return NULL;
 323
 324     pdp->loaderPrivate = data;
 325
 326     pdp->driScreenPriv = psp;
 327     pdp->driContextPriv = NULL;
 328
 329     dri_get_drawable(pdp);
 330
 331     if (!driDriverAPI.CreateBuffer(psp, pdp, &config->modes, GL_FALSE)) {
 332         free(pdp);
 333         return NULL;
 334     }
 335
 336     pdp->lastStamp = 1; /* const */
 337
 338     return pdp;
 339 }
 340
 341 static void
 342 driDestroyDrawable(__DRIdrawable *pdp)
 343 {
 344     dri_put_drawable(pdp);
 345 }
 346
 347 static void driSwapBuffers(__DRIdrawable *pdp)
 348 {
 349     driDriverAPI.SwapBuffers(pdp);
 350 }
 351
 352 const __DRIcoreExtension driCoreExtension = {
 353     { __DRI_CORE, __DRI_CORE_VERSION },
 354     NULL, /* driCreateNewScreen */
 355     driDestroyScreen,
 356     driGetExtensions,
 357     driGetConfigAttrib,
 358     driIndexConfigAttrib,
 359     NULL, /* driCreateNewDrawable */
 360     driDestroyDrawable,
 361     driSwapBuffers,
 362     driCreateNewContext,
 363     driCopyContext,
 364     driDestroyContext,
 365     driBindContext,
 366     driUnbindContext
 367 };
 368
 369 const __DRIswrastExtension driSWRastExtension = {
 370     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 371     driCreateNewScreen,
 372     driCreateNewDrawable,
 373     driCreateNewContextForAPI,
 374     driCreateContextAttribs
 375 };