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