src/gallium/state_trackers/wgl/stw_st.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2010 LunarG Inc.
   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  * Authors:
  25  *    Chia-I Wu <olv@lunarg.com>
  26  */
  27
  28 #include "util/u_memory.h"
  29 #include "util/u_inlines.h"
  30 #include "util/u_atomic.h"
  31 #include "state_tracker/st_gl_api.h" /* for st_gl_api_create */
  32
  33 #include "stw_st.h"
  34 #include "stw_device.h"
  35 #include "stw_framebuffer.h"
  36 #include "stw_pixelformat.h"
  37
  38 struct stw_st_framebuffer {
  39    struct st_framebuffer_iface base;
  40
  41    struct stw_framebuffer *fb;
  42    struct st_visual stvis;
  43
  44    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
  45    unsigned texture_width, texture_height;
  46    unsigned texture_mask;
  47 };
  48
  49
  50
  51 /**
  52  * Is the given mutex held by the calling thread?
  53  */
  54 bool
  55 stw_own_mutex(const CRITICAL_SECTION *cs)
  56 {
  57    // We can't compare OwningThread with our thread handle/id (see
  58    // http://stackoverflow.com/a/12675635 ) but we can compare with the
  59    // OwningThread member of a critical section we know we own.
  60    CRITICAL_SECTION dummy;
  61    InitializeCriticalSection(&dummy);
  62    EnterCriticalSection(&dummy);
  63    if (0)
  64       _debug_printf("%p %p\n", cs->OwningThread, dummy.OwningThread);
  65    bool ret = cs->OwningThread == dummy.OwningThread;
  66    LeaveCriticalSection(&dummy);
  67    DeleteCriticalSection(&dummy);
  68    return ret;
  69 }
  70
  71
  72 /**
  73  * Remove outdated textures and create the requested ones.
  74  */
  75 static void
  76 stw_st_framebuffer_validate_locked(struct st_framebuffer_iface *stfb,
  77                                    unsigned width, unsigned height,
  78                                    unsigned mask)
  79 {
  80    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
  81    struct pipe_resource templ;
  82    unsigned i;
  83
  84    /* remove outdated textures */
  85    if (stwfb->texture_width != width || stwfb->texture_height != height) {
  86       for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
  87          pipe_resource_reference(&stwfb->textures[i], NULL);
  88    }
  89
  90    memset(&templ, 0, sizeof(templ));
  91    templ.target = PIPE_TEXTURE_2D;
  92    templ.width0 = width;
  93    templ.height0 = height;
  94    templ.depth0 = 1;
  95    templ.array_size = 1;
  96    templ.last_level = 0;
  97    templ.nr_samples = stwfb->stvis.samples;
  98
  99    for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
 100       enum pipe_format format;
 101       unsigned bind;
 102
 103       /* the texture already exists or not requested */
 104       if (stwfb->textures[i] || !(mask & (1 << i))) {
 105          /* remember the texture */
 106          if (stwfb->textures[i])
 107             mask |= (1 << i);
 108          continue;
 109       }
 110
 111       switch (i) {
 112       case ST_ATTACHMENT_FRONT_LEFT:
 113       case ST_ATTACHMENT_BACK_LEFT:
 114          format = stwfb->stvis.color_format;
 115          bind = PIPE_BIND_DISPLAY_TARGET |
 116                 PIPE_BIND_SAMPLER_VIEW |
 117                 PIPE_BIND_RENDER_TARGET;
 118          break;
 119       case ST_ATTACHMENT_DEPTH_STENCIL:
 120          format = stwfb->stvis.depth_stencil_format;
 121          bind = PIPE_BIND_DEPTH_STENCIL;
 122          break;
 123       default:
 124          format = PIPE_FORMAT_NONE;
 125          break;
 126       }
 127
 128       if (format != PIPE_FORMAT_NONE) {
 129          templ.format = format;
 130          templ.bind = bind;
 131
 132          stwfb->textures[i] =
 133             stw_dev->screen->resource_create(stw_dev->screen, &templ);
 134       }
 135    }
 136
 137    stwfb->texture_width = width;
 138    stwfb->texture_height = height;
 139    stwfb->texture_mask = mask;
 140 }
 141
 142 static boolean
 143 stw_st_framebuffer_validate(struct st_context_iface *stctx,
 144                             struct st_framebuffer_iface *stfb,
 145                             const enum st_attachment_type *statts,
 146                             unsigned count,
 147                             struct pipe_resource **out)
 148 {
 149    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
 150    unsigned statt_mask, i;
 151
 152    statt_mask = 0x0;
 153    for (i = 0; i < count; i++)
 154       statt_mask |= 1 << statts[i];
 155
 156    stw_framebuffer_lock(stwfb->fb);
 157
 158    if (stwfb->fb->must_resize || (statt_mask & ~stwfb->texture_mask)) {
 159       stw_st_framebuffer_validate_locked(&stwfb->base,
 160             stwfb->fb->width, stwfb->fb->height, statt_mask);
 161       stwfb->fb->must_resize = FALSE;
 162    }
 163
 164    for (i = 0; i < count; i++) {
 165       out[i] = NULL;
 166       pipe_resource_reference(&out[i], stwfb->textures[statts[i]]);
 167    }
 168
 169    stw_framebuffer_unlock(stwfb->fb);
 170
 171    return TRUE;
 172 }
 173
 174 /**
 175  * Present an attachment of the framebuffer.
 176  */
 177 static boolean
 178 stw_st_framebuffer_present_locked(HDC hdc,
 179                                   struct st_framebuffer_iface *stfb,
 180                                   enum st_attachment_type statt)
 181 {
 182    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
 183    struct pipe_resource *resource;
 184
 185    assert(stw_own_mutex(&stwfb->fb->mutex));
 186
 187    resource = stwfb->textures[statt];
 188    if (resource) {
 189       stw_framebuffer_present_locked(hdc, stwfb->fb, resource);
 190    }
 191    else {
 192       stw_framebuffer_unlock(stwfb->fb);
 193    }
 194
 195    assert(!stw_own_mutex(&stwfb->fb->mutex));
 196
 197    return TRUE;
 198 }
 199
 200 static boolean
 201 stw_st_framebuffer_flush_front(struct st_context_iface *stctx,
 202                                struct st_framebuffer_iface *stfb,
 203                                enum st_attachment_type statt)
 204 {
 205    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
 206    boolean ret;
 207    HDC hDC;
 208
 209    stw_framebuffer_lock(stwfb->fb);
 210
 211    /* We must not cache HDCs anywhere, as they can be invalidated by the
 212     * application, or screen resolution changes. */
 213
 214    hDC = GetDC(stwfb->fb->hWnd);
 215
 216    ret = stw_st_framebuffer_present_locked(hDC, &stwfb->base, statt);
 217
 218    ReleaseDC(stwfb->fb->hWnd, hDC);
 219
 220    return ret;
 221 }
 222
 223 /**
 224  * Create a framebuffer interface.
 225  */
 226 struct st_framebuffer_iface *
 227 stw_st_create_framebuffer(struct stw_framebuffer *fb)
 228 {
 229    struct stw_st_framebuffer *stwfb;
 230
 231    stwfb = CALLOC_STRUCT(stw_st_framebuffer);
 232    if (!stwfb)
 233       return NULL;
 234
 235    stwfb->fb = fb;
 236    stwfb->stvis = fb->pfi->stvis;
 237
 238    stwfb->base.visual = &stwfb->stvis;
 239    p_atomic_set(&stwfb->base.stamp, 1);
 240    stwfb->base.flush_front = stw_st_framebuffer_flush_front;
 241    stwfb->base.validate = stw_st_framebuffer_validate;
 242
 243    return &stwfb->base;
 244 }
 245
 246 /**
 247  * Destroy a framebuffer interface.
 248  */
 249 void
 250 stw_st_destroy_framebuffer_locked(struct st_framebuffer_iface *stfb)
 251 {
 252    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
 253    int i;
 254
 255    for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
 256       pipe_resource_reference(&stwfb->textures[i], NULL);
 257
 258    FREE(stwfb);
 259 }
 260
 261 /**
 262  * Swap the buffers of the given framebuffer.
 263  */
 264 boolean
 265 stw_st_swap_framebuffer_locked(HDC hdc, struct st_framebuffer_iface *stfb)
 266 {
 267    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
 268    unsigned front = ST_ATTACHMENT_FRONT_LEFT, back = ST_ATTACHMENT_BACK_LEFT;
 269    struct pipe_resource *ptex;
 270    unsigned mask;
 271
 272    /* swap the textures */
 273    ptex = stwfb->textures[front];
 274    stwfb->textures[front] = stwfb->textures[back];
 275    stwfb->textures[back] = ptex;
 276
 277    /* convert to mask */
 278    front = 1 << front;
 279    back = 1 << back;
 280
 281    /* swap the bits in mask */
 282    mask = stwfb->texture_mask & ~(front | back);
 283    if (stwfb->texture_mask & front)
 284       mask |= back;
 285    if (stwfb->texture_mask & back)
 286       mask |= front;
 287    stwfb->texture_mask = mask;
 288
 289    front = ST_ATTACHMENT_FRONT_LEFT;
 290    return stw_st_framebuffer_present_locked(hdc, &stwfb->base, front);
 291 }
 292
 293
 294 /**
 295  * Return the pipe_resource that correspond to given buffer.
 296  */
 297 struct pipe_resource *
 298 stw_get_framebuffer_resource(struct st_framebuffer_iface *stfb,
 299                              enum st_attachment_type att)
 300 {
 301    struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
 302    return stwfb->textures[att];
 303 }
 304
 305
 306 /**
 307  * Create an st_api of the state tracker.
 308  */
 309 struct st_api *
 310 stw_st_create_api(void)
 311 {
 312    return st_gl_api_create();
 313 }