src/mesa/state_tracker/st_atom_framebuffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34 #include "st_context.h"
  35 #include "st_atom.h"
  36 #include "st_cb_fbo.h"
  37 #include "st_public.h"
  38 #include "st_texture.h"
  39 #include "pipe/p_context.h"
  40 #include "cso_cache/cso_context.h"
  41 #include "util/u_math.h"
  42 #include "util/u_inlines.h"
  43
  44
  45
  46 /**
  47  * When doing GL render to texture, we have to be sure that finalize_texture()
  48  * didn't yank out the pipe_texture that we earlier created a surface for.
  49  * Check for that here and create a new surface if needed.
  50  */
  51 static void
  52 update_renderbuffer_surface(struct st_context *st,
  53                             struct st_renderbuffer *strb)
  54 {
  55    struct pipe_screen *screen = st->pipe->screen;
  56    struct pipe_texture *texture = strb->rtt->pt;
  57    int rtt_width = strb->Base.Width;
  58    int rtt_height = strb->Base.Height;
  59
  60    if (!strb->surface ||
  61        strb->surface->texture != texture ||
  62        strb->surface->width != rtt_width ||
  63        strb->surface->height != rtt_height) {
  64       GLuint level;
  65       /* find matching mipmap level size */
  66       for (level = 0; level <= texture->last_level; level++) {
  67          if (u_minify(texture->width0, level) == rtt_width &&
  68              u_minify(texture->height0, level) == rtt_height) {
  69
  70             pipe_surface_reference(&strb->surface, NULL);
  71
  72             strb->surface = screen->get_tex_surface(screen,
  73                                               texture,
  74                                               strb->rtt_face,
  75                                               level,
  76                                               strb->rtt_slice,
  77                                               PIPE_BUFFER_USAGE_GPU_READ |
  78                                               PIPE_BUFFER_USAGE_GPU_WRITE);
  79 #if 0
  80             printf("-- alloc new surface %d x %d into tex %p\n",
  81                    strb->surface->width, strb->surface->height,
  82                    texture);
  83 #endif
  84             break;
  85          }
  86       }
  87    }
  88 }
  89
  90
  91 /**
  92  * Update framebuffer state (color, depth, stencil, etc. buffers)
  93  */
  94 static void
  95 update_framebuffer_state( struct st_context *st )
  96 {
  97    struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
  98    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
  99    struct st_renderbuffer *strb;
 100    GLuint i;
 101
 102    framebuffer->width = fb->Width;
 103    framebuffer->height = fb->Height;
 104
 105    /*printf("------ fb size %d x %d\n", fb->Width, fb->Height);*/
 106
 107    /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
 108     * to determine which surfaces to draw to
 109     */
 110    framebuffer->nr_cbufs = 0;
 111    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 112       strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
 113
 114       if (strb) {
 115          /*printf("--------- framebuffer surface rtt %p\n", strb->rtt);*/
 116          if (strb->rtt) {
 117             /* rendering to a GL texture, may have to update surface */
 118             update_renderbuffer_surface(st, strb);
 119          }
 120
 121          if (strb->surface) {
 122             pipe_surface_reference(&framebuffer->cbufs[framebuffer->nr_cbufs],
 123                                    strb->surface);
 124             framebuffer->nr_cbufs++;
 125          }
 126          strb->defined = GL_TRUE; /* we'll be drawing something */
 127       }
 128    }
 129    for (i = framebuffer->nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
 130       pipe_surface_reference(&framebuffer->cbufs[i], NULL);
 131    }
 132
 133    /*
 134     * Depth/Stencil renderbuffer/surface.
 135     */
 136    strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 137    if (strb) {
 138       strb = st_renderbuffer(strb->Base.Wrapped);
 139       if (strb->rtt) {
 140          /* rendering to a GL texture, may have to update surface */
 141          update_renderbuffer_surface(st, strb);
 142       }
 143       pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
 144    }
 145    else {
 146       strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 147       if (strb) {
 148          strb = st_renderbuffer(strb->Base.Wrapped);
 149          assert(strb->surface);
 150          pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
 151       }
 152       else
 153          pipe_surface_reference(&framebuffer->zsbuf, NULL);
 154    }
 155
 156    cso_set_framebuffer(st->cso_context, framebuffer);
 157
 158    if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
 159       if (st->frontbuffer_status == FRONT_STATUS_COPY_OF_BACK) {
 160          /* copy back color buffer to front color buffer */
 161          struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
 162          struct pipe_surface *surf_front, *surf_back;
 163          (void) st_get_framebuffer_surface(stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
 164          (void) st_get_framebuffer_surface(stfb, ST_SURFACE_BACK_LEFT, &surf_back);
 165
 166          st->pipe->surface_copy(st->pipe,
 167                                 surf_front, 0, 0,  /* dest */
 168                                 surf_back, 0, 0,   /* src */
 169                                 fb->Width, fb->Height);
 170       }
 171       /* we're assuming we'll really draw to the front buffer */
 172       st->frontbuffer_status = FRONT_STATUS_DIRTY;
 173    }
 174 }
 175
 176
 177 const struct st_tracked_state st_update_framebuffer = {
 178    "st_update_framebuffer",                             /* name */
 179    {                                                    /* dirty */
 180       _NEW_BUFFERS,                                     /* mesa */
 181       ST_NEW_FRAMEBUFFER,                               /* st */
 182    },
 183    update_framebuffer_state                             /* update */
 184 };
 185