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_texture.h"
  38 #include "pipe/p_context.h"
  39 #include "pipe/p_inlines.h"
  40 #include "cso_cache/cso_context.h"
  41
  42
  43
  44 /**
  45  * When doing GL render to texture, we have to be sure that finalize_texture()
  46  * didn't yank out the pipe_texture that we earlier created a surface for.
  47  * Check for that here and create a new surface if needed.
  48  */
  49 static void
  50 update_renderbuffer_surface(struct st_context *st,
  51                             struct st_renderbuffer *strb)
  52 {
  53    struct pipe_screen *screen = st->pipe->screen;
  54    struct pipe_texture *texture = strb->rtt->pt;
  55    int rtt_width = strb->Base.Width;
  56    int rtt_height = strb->Base.Height;
  57
  58    if (!strb->surface ||
  59        strb->surface->texture != texture ||
  60        strb->surface->width != rtt_width ||
  61        strb->surface->height != rtt_height) {
  62       GLuint level;
  63       /* find matching mipmap level size */
  64       for (level = 0; level <= texture->last_level; level++) {
  65          if (texture->width[level] == rtt_width &&
  66              texture->height[level] == rtt_height) {
  67
  68             pipe_surface_reference(&strb->surface, NULL);
  69
  70             strb->surface = screen->get_tex_surface(screen,
  71                                               texture,
  72                                               strb->rtt_face,
  73                                               level,
  74                                               strb->rtt_slice,
  75                                               PIPE_BUFFER_USAGE_GPU_READ |
  76                                               PIPE_BUFFER_USAGE_GPU_WRITE);
  77 #if 0
  78             printf("-- alloc new surface %d x %d into tex %p\n",
  79                    strb->surface->width, strb->surface->height,
  80                    texture);
  81 #endif
  82             break;
  83          }
  84       }
  85    }
  86 }
  87
  88
  89 /**
  90  * Update framebuffer state (color, depth, stencil, etc. buffers)
  91  */
  92 static void
  93 update_framebuffer_state( struct st_context *st )
  94 {
  95    struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
  96    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
  97    struct st_renderbuffer *strb;
  98    GLuint i;
  99
 100    memset(framebuffer, 0, sizeof(*framebuffer));
 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->num_cbufs = 0;
 111    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 112       strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
 113
 114       /*printf("--------- framebuffer surface rtt %p\n", strb->rtt);*/
 115       if (strb->rtt) {
 116          /* rendering to a GL texture, may have to update surface */
 117          update_renderbuffer_surface(st, strb);
 118       }
 119
 120       assert(strb->surface);
 121       framebuffer->cbufs[framebuffer->num_cbufs] = strb->surface;
 122       framebuffer->num_cbufs++;
 123    }
 124
 125    strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 126    if (strb) {
 127       strb = st_renderbuffer(strb->Base.Wrapped);
 128       if (strb->rtt) {
 129          /* rendering to a GL texture, may have to update surface */
 130          update_renderbuffer_surface(st, strb);
 131       }
 132
 133       assert(strb->surface);
 134       framebuffer->zsbuf = strb->surface;
 135    }
 136    else {
 137       strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 138       if (strb) {
 139          strb = st_renderbuffer(strb->Base.Wrapped);
 140          assert(strb->surface);
 141          framebuffer->zsbuf = strb->surface;
 142       }
 143    }
 144
 145    cso_set_framebuffer(st->cso_context, framebuffer);
 146
 147    if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
 148       if (st->frontbuffer_status == FRONT_STATUS_COPY_OF_BACK) {
 149          /* XXX copy back buf to front? */
 150       }
 151       /* we're assuming we'll really draw to the front buffer */
 152       st->frontbuffer_status = FRONT_STATUS_DIRTY;
 153    }
 154 }
 155
 156
 157 const struct st_tracked_state st_update_framebuffer = {
 158    "st_update_framebuffer",                             /* name */
 159    {                                                    /* dirty */
 160       _NEW_BUFFERS,                                     /* mesa */
 161       ST_NEW_FRAMEBUFFER,                               /* st */
 162    },
 163    update_framebuffer_state                             /* update */
 164 };
 165