src/gallium/state_trackers/dri/common/dri_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009, VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * 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
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Author: Keith Whitwell <keithw@vmware.com>
  29  * Author: Jakob Bornecrantz <wallbraker@gmail.com>
  30  */
  31
  32 #include "utils.h"
  33
  34 #include "dri_screen.h"
  35 #include "dri_drawable.h"
  36 #include "dri_context.h"
  37
  38 #include "pipe/p_context.h"
  39 #include "state_tracker/st_context.h"
  40
  41 static void
  42 dri_init_extensions(struct dri_context *ctx)
  43 {
  44    struct st_context *st = (struct st_context *) ctx->st;
  45
  46    /* New extensions should be added in mesa/state_tracker/st_extensions.c
  47     * and not in this file. */
  48    driInitExtensions(st->ctx, NULL, GL_FALSE);
  49 }
  50
  51 GLboolean
  52 dri_create_context(gl_api api, const struct gl_config * visual,
  53                    __DRIcontext * cPriv, void *sharedContextPrivate)
  54 {
  55    __DRIscreen *sPriv = cPriv->driScreenPriv;
  56    struct dri_screen *screen = dri_screen(sPriv);
  57    struct st_api *stapi = screen->st_api;
  58    struct dri_context *ctx = NULL;
  59    struct st_context_iface *st_share = NULL;
  60    struct st_context_attribs attribs;
  61
  62    memset(&attribs, 0, sizeof(attribs));
  63    switch (api) {
  64    case API_OPENGLES:
  65       attribs.profile = ST_PROFILE_OPENGL_ES1;
  66       break;
  67    case API_OPENGLES2:
  68       attribs.profile = ST_PROFILE_OPENGL_ES2;
  69       break;
  70    default:
  71       attribs.profile = ST_PROFILE_DEFAULT;
  72       break;
  73    }
  74
  75    if (sharedContextPrivate) {
  76       st_share = ((struct dri_context *)sharedContextPrivate)->st;
  77    }
  78
  79    ctx = CALLOC_STRUCT(dri_context);
  80    if (ctx == NULL)
  81       goto fail;
  82
  83    cPriv->driverPrivate = ctx;
  84    ctx->cPriv = cPriv;
  85    ctx->sPriv = sPriv;
  86    ctx->lock = screen->drmLock;
  87
  88    driParseConfigFiles(&ctx->optionCache,
  89                        &screen->optionCache, sPriv->myNum, "dri");
  90
  91    dri_fill_st_visual(&attribs.visual, screen, visual);
  92    ctx->st = stapi->create_context(stapi, &screen->base, &attribs, st_share);
  93    if (ctx->st == NULL)
  94       goto fail;
  95    ctx->st->st_manager_private = (void *) ctx;
  96    ctx->stapi = stapi;
  97
  98    /*
  99     * libmesagallium.a that this state tracker will be linked to expects
 100     * OpenGL's _glapi_table.  That is, it expects libGL.so instead of
 101     * libGLESv1_CM.so or libGLESv2.so.  As there is no clean way to know the
 102     * shared library the app links to, use the api as a simple check.
 103     * It might be as well to simply remove this function call though.
 104     */
 105    if (api == API_OPENGL)
 106       dri_init_extensions(ctx);
 107
 108    return GL_TRUE;
 109
 110  fail:
 111    if (ctx && ctx->st)
 112       ctx->st->destroy(ctx->st);
 113
 114    FREE(ctx);
 115    return GL_FALSE;
 116 }
 117
 118 void
 119 dri_destroy_context(__DRIcontext * cPriv)
 120 {
 121    struct dri_context *ctx = dri_context(cPriv);
 122
 123    /* note: we are freeing values and nothing more because
 124     * driParseConfigFiles allocated values only - the rest
 125     * is owned by screen optionCache.
 126     */
 127    FREE(ctx->optionCache.values);
 128
 129    /* No particular reason to wait for command completion before
 130     * destroying a context, but it is probably worthwhile flushing it
 131     * to avoid having to add code elsewhere to cope with flushing a
 132     * partially destroyed context.
 133     */
 134    ctx->st->flush(ctx->st, 0, NULL);
 135    ctx->st->destroy(ctx->st);
 136
 137    FREE(ctx);
 138 }
 139
 140 GLboolean
 141 dri_unbind_context(__DRIcontext * cPriv)
 142 {
 143    /* dri_util.c ensures cPriv is not null */
 144    struct dri_screen *screen = dri_screen(cPriv->driScreenPriv);
 145    struct dri_context *ctx = dri_context(cPriv);
 146    struct dri_drawable *draw = dri_drawable(ctx->dPriv);
 147    struct dri_drawable *read = dri_drawable(ctx->rPriv);
 148    struct st_api *stapi = screen->st_api;
 149
 150    if (--ctx->bind_count == 0) {
 151       if (ctx->st == ctx->stapi->get_current(ctx->stapi)) {
 152          ctx->st->flush(ctx->st, ST_FLUSH_FRONT, NULL);
 153          stapi->make_current(stapi, NULL, NULL, NULL);
 154       }
 155    }
 156
 157    return GL_TRUE;
 158 }
 159
 160 GLboolean
 161 dri_make_current(__DRIcontext * cPriv,
 162                  __DRIdrawable * driDrawPriv,
 163                  __DRIdrawable * driReadPriv)
 164 {
 165    /* dri_util.c ensures cPriv is not null */
 166    struct dri_context *ctx = dri_context(cPriv);
 167    struct dri_drawable *draw = dri_drawable(driDrawPriv);
 168    struct dri_drawable *read = dri_drawable(driReadPriv);
 169    struct st_context_iface *old_st = ctx->stapi->get_current(ctx->stapi);
 170
 171    if (old_st && old_st != ctx->st)
 172       old_st->flush(old_st, ST_FLUSH_FRONT, NULL);
 173
 174    ++ctx->bind_count;
 175
 176    if (!driDrawPriv && !driReadPriv)
 177       return ctx->stapi->make_current(ctx->stapi, ctx->st, NULL, NULL);
 178    else if (!driDrawPriv || !driReadPriv)
 179       return GL_FALSE;
 180
 181    if (ctx->dPriv != driDrawPriv) {
 182       ctx->dPriv = driDrawPriv;
 183       draw->texture_stamp = driDrawPriv->lastStamp - 1;
 184    }
 185    if (ctx->rPriv != driReadPriv) {
 186       ctx->rPriv = driReadPriv;
 187       read->texture_stamp = driReadPriv->lastStamp - 1;
 188    }
 189
 190    ctx->stapi->make_current(ctx->stapi, ctx->st, &draw->base, &read->base);
 191
 192    return GL_TRUE;
 193 }
 194
 195 struct dri_context *
 196 dri_get_current(__DRIscreen *sPriv)
 197 {
 198    struct dri_screen *screen = dri_screen(sPriv);
 199    struct st_api *stapi = screen->st_api;
 200    struct st_context_iface *st;
 201
 202    st = stapi->get_current(stapi);
 203
 204    return (struct dri_context *) (st) ? st->st_manager_private : NULL;
 205 }
 206
 207 /* vim: set sw=3 ts=8 sts=3 expandtab: */