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  * BRIAN PAUL 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             mesa_api = API_OPENGLES2;
 127             break;
 128     case __DRI_API_OPENGL_CORE:
 129     default:
 130             return NULL;
 131     }
 132
 133     for (unsigned i = 0; i < num_attribs; i++) {
 134         switch (attribs[i * 2]) {
 135         case __DRI_CTX_ATTRIB_MAJOR_VERSION:
 136             major_version = attribs[i * 2 + 1];
 137             break;
 138         case __DRI_CTX_ATTRIB_MINOR_VERSION:
 139             minor_version = attribs[i * 2 + 1];
 140             break;
 141         case __DRI_CTX_ATTRIB_FLAGS:
 142             flags = attribs[i * 2 + 1];
 143             break;
 144         default:
 145             /* We can't create a context that satisfies the requirements of an
 146              * attribute that we don't understand.  Return failure.
 147              */
 148             return NULL;
 149         }
 150     }
 151
 152     /* There are no forward-compatible contexts before OpenGL 3.0.  The
 153      * GLX_ARB_create_context spec says:
 154      *
 155      *     "Forward-compatible contexts are defined only for OpenGL versions
 156      *     3.0 and later."
 157      *
 158      * Moreover, Mesa can't fulfill the requirements of a forward-looking
 159      * context.  Return failure if a forward-looking context is requested.
 160      *
 161      * In Mesa, a debug context is the same as a regular context.
 162      */
 163     if (major_version >= 3) {
 164         if ((flags & ~__DRI_CTX_FLAG_DEBUG) != 0)
 165             return NULL;
 166     }
 167
 168     pcp = CALLOC_STRUCT(__DRIcontextRec);
 169     if (!pcp)
 170         return NULL;
 171
 172     pcp->loaderPrivate = data;
 173
 174     pcp->driScreenPriv = screen;
 175     pcp->driDrawablePriv = NULL;
 176     pcp->driReadablePriv = NULL;
 177
 178     if (!driDriverAPI.CreateContext(mesa_api, modes, pcp,
 179                                     major_version, minor_version,
 180                                     flags, error, shareCtx)) {
 181         free(pcp);
 182         return NULL;
 183     }
 184
 185     return pcp;
 186 }
 187
 188 static __DRIcontext *
 189 driCreateNewContextForAPI(__DRIscreen *psp, int api,
 190                           const __DRIconfig *config,
 191                           __DRIcontext *shared, void *data)
 192 {
 193     unsigned error;
 194
 195     return driCreateContextAttribs(psp, api, config, shared, 0, NULL,
 196                                    &error, data);
 197 }
 198
 199 static __DRIcontext *
 200 driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
 201                     __DRIcontext *shared, void *data)
 202 {
 203     return driCreateNewContextForAPI(psp, __DRI_API_OPENGL,
 204                                      config, shared, data);
 205 }
 206
 207 static void
 208 driDestroyContext(__DRIcontext *pcp)
 209 {
 210     if (pcp) {
 211         driDriverAPI.DestroyContext(pcp);
 212         free(pcp);
 213     }
 214 }
 215
 216 static int
 217 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 218 {
 219     return GL_FALSE;
 220 }
 221
 222 static void dri_get_drawable(__DRIdrawable *pdp);
 223 static void dri_put_drawable(__DRIdrawable *pdp);
 224
 225 static int driBindContext(__DRIcontext *pcp,
 226                           __DRIdrawable *pdp,
 227                           __DRIdrawable *prp)
 228 {
 229     /* Bind the drawable to the context */
 230     if (pcp) {
 231         pcp->driDrawablePriv = pdp;
 232         pcp->driReadablePriv = prp;
 233         if (pdp) {
 234             pdp->driContextPriv = pcp;
 235             dri_get_drawable(pdp);
 236         }
 237         if (prp && pdp != prp) {
 238             dri_get_drawable(prp);
 239         }
 240     }
 241
 242     return driDriverAPI.MakeCurrent(pcp, pdp, prp);
 243 }
 244
 245 static int driUnbindContext(__DRIcontext *pcp)
 246 {
 247     __DRIdrawable *pdp;
 248     __DRIdrawable *prp;
 249
 250     if (pcp == NULL)
 251         return GL_FALSE;
 252
 253     pdp = pcp->driDrawablePriv;
 254     prp = pcp->driReadablePriv;
 255
 256     /* already unbound */
 257     if (!pdp && !prp)
 258         return GL_TRUE;
 259
 260     driDriverAPI.UnbindContext(pcp);
 261
 262     dri_put_drawable(pdp);
 263
 264     if (prp != pdp) {
 265         dri_put_drawable(prp);
 266     }
 267
 268     pcp->driDrawablePriv = NULL;
 269     pcp->driReadablePriv = NULL;
 270
 271     return GL_TRUE;
 272 }
 273
 274
 275 /**
 276  * Drawable functions
 277  */
 278
 279 static void dri_get_drawable(__DRIdrawable *pdp)
 280 {
 281     pdp->refcount++;
 282 }
 283
 284 static void dri_put_drawable(__DRIdrawable *pdp)
 285 {
 286     if (pdp) {
 287         pdp->refcount--;
 288         if (pdp->refcount)
 289             return;
 290
 291         driDriverAPI.DestroyBuffer(pdp);
 292         free(pdp);
 293     }
 294 }
 295
 296 static __DRIdrawable *
 297 driCreateNewDrawable(__DRIscreen *psp,
 298                      const __DRIconfig *config, void *data)
 299 {
 300     __DRIdrawable *pdp;
 301
 302     pdp = CALLOC_STRUCT(__DRIdrawableRec);
 303     if (!pdp)
 304         return NULL;
 305
 306     pdp->loaderPrivate = data;
 307
 308     pdp->driScreenPriv = psp;
 309     pdp->driContextPriv = NULL;
 310
 311     dri_get_drawable(pdp);
 312
 313     if (!driDriverAPI.CreateBuffer(psp, pdp, &config->modes, GL_FALSE)) {
 314         free(pdp);
 315         return NULL;
 316     }
 317
 318     pdp->lastStamp = 1; /* const */
 319
 320     return pdp;
 321 }
 322
 323 static void
 324 driDestroyDrawable(__DRIdrawable *pdp)
 325 {
 326     dri_put_drawable(pdp);
 327 }
 328
 329 static void driSwapBuffers(__DRIdrawable *pdp)
 330 {
 331     driDriverAPI.SwapBuffers(pdp);
 332 }
 333
 334 const __DRIcoreExtension driCoreExtension = {
 335     { __DRI_CORE, __DRI_CORE_VERSION },
 336     NULL, /* driCreateNewScreen */
 337     driDestroyScreen,
 338     driGetExtensions,
 339     driGetConfigAttrib,
 340     driIndexConfigAttrib,
 341     NULL, /* driCreateNewDrawable */
 342     driDestroyDrawable,
 343     driSwapBuffers,
 344     driCreateNewContext,
 345     driCopyContext,
 346     driDestroyContext,
 347     driBindContext,
 348     driUnbindContext
 349 };
 350
 351 const __DRIswrastExtension driSWRastExtension = {
 352     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 353     driCreateNewScreen,
 354     driCreateNewDrawable,
 355     driCreateNewContextForAPI,
 356     driCreateContextAttribs
 357 };