src/gallium/state_trackers/dri/sw/drisw.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009, VMware, Inc.
   4  * All Rights Reserved.
   5  * Copyright 2010 George Sapountzis <gsapountzis@gmail.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 /* TODO:
  30  *
  31  * xshm / texture_from_pixmap / EGLImage:
  32  *
  33  * Allow the loaders to use the XSHM extension. It probably requires callbacks
  34  * for createImage/destroyImage similar to DRI2 getBuffers.
  35  */
  36
  37 #include "util/u_format.h"
  38 #include "util/u_memory.h"
  39 #include "util/u_inlines.h"
  40 #include "pipe/p_context.h"
  41 #include "state_tracker/drisw_api.h"
  42
  43 #include "dri_screen.h"
  44 #include "dri_context.h"
  45 #include "dri_drawable.h"
  46
  47 DEBUG_GET_ONCE_BOOL_OPTION(swrast_no_present, "SWRAST_NO_PRESENT", FALSE);
  48 static boolean swrast_no_present = FALSE;
  49
  50 static INLINE void
  51 get_drawable_info(__DRIdrawable *dPriv, int *w, int *h)
  52 {
  53    __DRIscreen *sPriv = dPriv->driScreenPriv;
  54    const __DRIswrastLoaderExtension *loader = sPriv->swrast_loader;
  55    int x, y;
  56
  57    loader->getDrawableInfo(dPriv,
  58                            &x, &y, w, h,
  59                            dPriv->loaderPrivate);
  60 }
  61
  62 static INLINE void
  63 put_image(__DRIdrawable *dPriv, void *data, unsigned width, unsigned height)
  64 {
  65    __DRIscreen *sPriv = dPriv->driScreenPriv;
  66    const __DRIswrastLoaderExtension *loader = sPriv->swrast_loader;
  67
  68    loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
  69                     0, 0, width, height,
  70                     data, dPriv->loaderPrivate);
  71 }
  72
  73 static void
  74 drisw_update_drawable_info(struct dri_drawable *drawable)
  75 {
  76    __DRIdrawable *dPriv = drawable->dPriv;
  77
  78    get_drawable_info(dPriv, &dPriv->w, &dPriv->h);
  79 }
  80
  81 static void
  82 drisw_put_image(struct dri_drawable *drawable,
  83                 void *data, unsigned width, unsigned height)
  84 {
  85    __DRIdrawable *dPriv = drawable->dPriv;
  86
  87    put_image(dPriv, data, width, height);
  88 }
  89
  90 static INLINE void
  91 drisw_present_texture(__DRIdrawable *dPriv,
  92                       struct pipe_resource *ptex)
  93 {
  94    struct dri_drawable *drawable = dri_drawable(dPriv);
  95    struct dri_screen *screen = dri_screen(drawable->sPriv);
  96
  97    if (swrast_no_present)
  98       return;
  99
 100    screen->base.screen->flush_frontbuffer(screen->base.screen, ptex, 0, 0, drawable);
 101 }
 102
 103 static INLINE void
 104 drisw_invalidate_drawable(__DRIdrawable *dPriv)
 105 {
 106    struct dri_drawable *drawable = dri_drawable(dPriv);
 107
 108    drawable->texture_stamp = dPriv->lastStamp - 1;
 109
 110    p_atomic_inc(&drawable->base.stamp);
 111 }
 112
 113 static INLINE void
 114 drisw_copy_to_front(__DRIdrawable * dPriv,
 115                     struct pipe_resource *ptex)
 116 {
 117    drisw_present_texture(dPriv, ptex);
 118
 119    drisw_invalidate_drawable(dPriv);
 120 }
 121
 122 /*
 123  * Backend functions for st_framebuffer interface and swap_buffers.
 124  */
 125
 126 static void
 127 drisw_swap_buffers(__DRIdrawable *dPriv)
 128 {
 129    struct dri_context *ctx = dri_get_current(dPriv->driScreenPriv);
 130    struct dri_drawable *drawable = dri_drawable(dPriv);
 131    struct pipe_resource *ptex;
 132
 133    if (!ctx)
 134       return;
 135
 136    ptex = drawable->textures[ST_ATTACHMENT_BACK_LEFT];
 137
 138    if (ptex) {
 139       ctx->st->flush(ctx->st, ST_FLUSH_FRONT, NULL);
 140
 141       drisw_copy_to_front(dPriv, ptex);
 142    }
 143 }
 144
 145 static void
 146 drisw_flush_frontbuffer(struct dri_drawable *drawable,
 147                         enum st_attachment_type statt)
 148 {
 149    struct dri_context *ctx = dri_get_current(drawable->sPriv);
 150    struct pipe_resource *ptex;
 151
 152    if (!ctx)
 153       return;
 154
 155    ptex = drawable->textures[statt];
 156
 157    if (ptex) {
 158       drisw_copy_to_front(ctx->dPriv, ptex);
 159    }
 160 }
 161
 162 /**
 163  * Allocate framebuffer attachments.
 164  *
 165  * During fixed-size operation, the function keeps allocating new attachments
 166  * as they are requested. Unused attachments are not removed, not until the
 167  * framebuffer is resized or destroyed.
 168  */
 169 static void
 170 drisw_allocate_textures(struct dri_drawable *drawable,
 171                         const enum st_attachment_type *statts,
 172                         unsigned count)
 173 {
 174    struct dri_screen *screen = dri_screen(drawable->sPriv);
 175    struct pipe_resource templ;
 176    unsigned width, height;
 177    boolean resized;
 178    unsigned i;
 179
 180    width  = drawable->dPriv->w;
 181    height = drawable->dPriv->h;
 182
 183    resized = (drawable->old_w != width ||
 184               drawable->old_h != height);
 185
 186    /* remove outdated textures */
 187    if (resized) {
 188       for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
 189          pipe_resource_reference(&drawable->textures[i], NULL);
 190    }
 191
 192    memset(&templ, 0, sizeof(templ));
 193    templ.target = screen->target;
 194    templ.width0 = width;
 195    templ.height0 = height;
 196    templ.depth0 = 1;
 197    templ.array_size = 1;
 198    templ.last_level = 0;
 199
 200    for (i = 0; i < count; i++) {
 201       enum pipe_format format;
 202       unsigned bind;
 203
 204       /* the texture already exists or not requested */
 205       if (drawable->textures[statts[i]])
 206          continue;
 207
 208       dri_drawable_get_format(drawable, statts[i], &format, &bind);
 209
 210       /* if we don't do any present, no need for display targets */
 211       if (statts[i] != ST_ATTACHMENT_DEPTH_STENCIL && !swrast_no_present)
 212          bind |= PIPE_BIND_DISPLAY_TARGET;
 213
 214       if (format == PIPE_FORMAT_NONE)
 215          continue;
 216
 217       templ.format = format;
 218       templ.bind = bind;
 219
 220       drawable->textures[statts[i]] =
 221          screen->base.screen->resource_create(screen->base.screen, &templ);
 222    }
 223
 224    drawable->old_w = width;
 225    drawable->old_h = height;
 226 }
 227
 228 /*
 229  * Backend function for init_screen.
 230  */
 231
 232 static const __DRIextension *drisw_screen_extensions[] = {
 233    &driTexBufferExtension.base,
 234    NULL
 235 };
 236
 237 static struct drisw_loader_funcs drisw_lf = {
 238    .put_image = drisw_put_image
 239 };
 240
 241 static const __DRIconfig **
 242 drisw_init_screen(__DRIscreen * sPriv)
 243 {
 244    const __DRIconfig **configs;
 245    struct dri_screen *screen;
 246    struct pipe_screen *pscreen;
 247
 248    screen = CALLOC_STRUCT(dri_screen);
 249    if (!screen)
 250       return NULL;
 251
 252    screen->sPriv = sPriv;
 253    screen->fd = -1;
 254
 255    swrast_no_present = debug_get_option_swrast_no_present();
 256
 257    sPriv->private = (void *)screen;
 258    sPriv->extensions = drisw_screen_extensions;
 259
 260    pscreen = drisw_create_screen(&drisw_lf);
 261    /* dri_init_screen_helper checks pscreen for us */
 262
 263    configs = dri_init_screen_helper(screen, pscreen, 32);
 264    if (!configs)
 265       goto fail;
 266
 267    return configs;
 268 fail:
 269    dri_destroy_screen_helper(screen);
 270    FREE(screen);
 271    return NULL;
 272 }
 273
 274 static boolean
 275 drisw_create_buffer(__DRIscreen * sPriv,
 276                     __DRIdrawable * dPriv,
 277                     const struct gl_config * visual, boolean isPixmap)
 278 {
 279    struct dri_drawable *drawable = NULL;
 280
 281    if (!dri_create_buffer(sPriv, dPriv, visual, isPixmap))
 282       return FALSE;
 283
 284    drawable = dPriv->driverPrivate;
 285
 286    drawable->allocate_textures = drisw_allocate_textures;
 287    drawable->update_drawable_info = drisw_update_drawable_info;
 288    drawable->flush_frontbuffer = drisw_flush_frontbuffer;
 289
 290    return TRUE;
 291 }
 292
 293 /**
 294  * DRI driver virtual function table.
 295  *
 296  * DRI versions differ in their implementation of init_screen and swap_buffers.
 297  */
 298 const struct __DriverAPIRec driDriverAPI = {
 299    .InitScreen = drisw_init_screen,
 300    .DestroyScreen = dri_destroy_screen,
 301    .CreateContext = dri_create_context,
 302    .DestroyContext = dri_destroy_context,
 303    .CreateBuffer = drisw_create_buffer,
 304    .DestroyBuffer = dri_destroy_buffer,
 305    .MakeCurrent = dri_make_current,
 306    .UnbindContext = dri_unbind_context,
 307
 308    .SwapBuffers = drisw_swap_buffers,
 309 };
 310
 311 /* This is the table of extensions that the loader will dlsym() for. */
 312 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 313     &driCoreExtension.base,
 314     &driSWRastExtension.base,
 315     NULL
 316 };
 317
 318 /* vim: set sw=3 ts=8 sts=3 expandtab: */