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      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 (at) 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 }
    314