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      1 /**************************************************************************
      2  *
      3  * Copyright 2007 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  /*
     29   * Authors:
     30   *   Keith Whitwell <keithw (at) vmware.com>
     31   *   Brian Paul
     32   */
     33 
     34 #include "main/glheader.h"
     35 #include "main/macros.h"
     36 #include "main/context.h"
     37 #include "st_context.h"
     38 #include "st_cb_bitmap.h"
     39 #include "st_cb_flush.h"
     40 #include "st_cb_clear.h"
     41 #include "st_cb_fbo.h"
     42 #include "st_manager.h"
     43 #include "pipe/p_context.h"
     44 #include "pipe/p_defines.h"
     45 #include "pipe/p_screen.h"
     46 #include "util/u_gen_mipmap.h"
     47 
     48 
     49 /** Check if we have a front color buffer and if it's been drawn to. */
     50 static inline GLboolean
     51 is_front_buffer_dirty(struct st_context *st)
     52 {
     53    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
     54    struct st_renderbuffer *strb
     55       = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
     56    return strb && strb->defined;
     57 }
     58 
     59 
     60 /**
     61  * Tell the screen to display the front color buffer on-screen.
     62  */
     63 static void
     64 display_front_buffer(struct st_context *st)
     65 {
     66    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
     67    struct st_renderbuffer *strb
     68       = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
     69 
     70    if (strb) {
     71       /* Hook for copying "fake" frontbuffer if necessary:
     72        */
     73       st_manager_flush_frontbuffer(st);
     74    }
     75 }
     76 
     77 
     78 void st_flush(struct st_context *st,
     79               struct pipe_fence_handle **fence,
     80               unsigned flags)
     81 {
     82    FLUSH_VERTICES(st->ctx, 0);
     83    FLUSH_CURRENT(st->ctx, 0);
     84 
     85    st_flush_bitmap_cache(st);
     86 
     87    st->pipe->flush(st->pipe, fence, flags);
     88 }
     89 
     90 
     91 /**
     92  * Flush, and wait for completion.
     93  */
     94 void st_finish( struct st_context *st )
     95 {
     96    struct pipe_fence_handle *fence = NULL;
     97 
     98    st_flush(st, &fence, 0);
     99 
    100    if(fence) {
    101       st->pipe->screen->fence_finish(st->pipe->screen, NULL, fence,
    102                                      PIPE_TIMEOUT_INFINITE);
    103       st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
    104    }
    105 }
    106 
    107 
    108 
    109 /**
    110  * Called via ctx->Driver.Flush()
    111  */
    112 static void st_glFlush(struct gl_context *ctx)
    113 {
    114    struct st_context *st = st_context(ctx);
    115 
    116    /* Don't call st_finish() here.  It is not the state tracker's
    117     * responsibilty to inject sleeps in the hope of avoiding buffer
    118     * synchronization issues.  Calling finish() here will just hide
    119     * problems that need to be fixed elsewhere.
    120     */
    121    st_flush(st, NULL, 0);
    122 
    123    if (is_front_buffer_dirty(st)) {
    124       display_front_buffer(st);
    125    }
    126 }
    127 
    128 
    129 /**
    130  * Called via ctx->Driver.Finish()
    131  */
    132 static void st_glFinish(struct gl_context *ctx)
    133 {
    134    struct st_context *st = st_context(ctx);
    135 
    136    st_finish(st);
    137 
    138    if (is_front_buffer_dirty(st)) {
    139       display_front_buffer(st);
    140    }
    141 }
    142 
    143 
    144 static GLenum
    145 gl_reset_status_from_pipe_reset_status(enum pipe_reset_status status)
    146 {
    147    switch (status) {
    148    case PIPE_NO_RESET:
    149       return GL_NO_ERROR;
    150    case PIPE_GUILTY_CONTEXT_RESET:
    151       return GL_GUILTY_CONTEXT_RESET_ARB;
    152    case PIPE_INNOCENT_CONTEXT_RESET:
    153       return GL_INNOCENT_CONTEXT_RESET_ARB;
    154    case PIPE_UNKNOWN_CONTEXT_RESET:
    155       return GL_UNKNOWN_CONTEXT_RESET_ARB;
    156    default:
    157       assert(0);
    158       return GL_NO_ERROR;
    159    }
    160 }
    161 
    162 
    163 /**
    164  * Query information about GPU resets observed by this context
    165  *
    166  * Called via \c dd_function_table::GetGraphicsResetStatus.
    167  */
    168 static GLenum
    169 st_get_graphics_reset_status(struct gl_context *ctx)
    170 {
    171    struct st_context *st = st_context(ctx);
    172    enum pipe_reset_status status;
    173 
    174    if (st->reset_status != PIPE_NO_RESET) {
    175       status = st->reset_status;
    176       st->reset_status = PIPE_NO_RESET;
    177    } else {
    178       status = st->pipe->get_device_reset_status(st->pipe);
    179    }
    180 
    181    return gl_reset_status_from_pipe_reset_status(status);
    182 }
    183 
    184 
    185 static void
    186 st_device_reset_callback(void *data, enum pipe_reset_status status)
    187 {
    188    struct st_context *st = data;
    189 
    190    assert(status != PIPE_NO_RESET);
    191 
    192    st->reset_status = status;
    193    _mesa_set_context_lost_dispatch(st->ctx);
    194 }
    195 
    196 
    197 void
    198 st_install_device_reset_callback(struct st_context *st)
    199 {
    200    if (st->pipe->set_device_reset_callback) {
    201       struct pipe_device_reset_callback cb;
    202       cb.reset = st_device_reset_callback;
    203       cb.data = st;
    204       st->pipe->set_device_reset_callback(st->pipe, &cb);
    205    }
    206 }
    207 
    208 
    209 void st_init_flush_functions(struct pipe_screen *screen,
    210                              struct dd_function_table *functions)
    211 {
    212    functions->Flush = st_glFlush;
    213    functions->Finish = st_glFinish;
    214 
    215    if (screen->get_param(screen, PIPE_CAP_DEVICE_RESET_STATUS_QUERY))
    216       functions->GetGraphicsResetStatus = st_get_graphics_reset_status;
    217 
    218    /* Windows opengl32.dll calls glFinish prior to every swapbuffers.
    219     * This is unnecessary and degrades performance.  Luckily we have some
    220     * scope to work around this, as the externally-visible behaviour of
    221     * Finish() is identical to Flush() in all cases - no differences in
    222     * rendering or ReadPixels are visible if we opt not to wait here.
    223     *
    224     * Only set this up on Windows to avoid surprise elsewhere.
    225     */
    226 #ifdef PIPE_OS_WINDOWS
    227    functions->Finish = st_glFlush;
    228 #endif
    229 }
    230