src/mesa/state_tracker/st_atom_framebuffer.c

   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@vmware.com>
  31   *   Brian Paul
  32   */
  33
  34 #include <limits.h>
  35
  36 #include "st_context.h"
  37 #include "st_atom.h"
  38 #include "st_cb_bitmap.h"
  39 #include "st_cb_fbo.h"
  40 #include "st_texture.h"
  41 #include "pipe/p_context.h"
  42 #include "cso_cache/cso_context.h"
  43 #include "util/u_math.h"
  44 #include "util/u_inlines.h"
  45 #include "util/u_format.h"
  46
  47
  48 /**
  49  * Update framebuffer size.
  50  *
  51  * We need to derive pipe_framebuffer size from the bound pipe_surfaces here
  52  * instead of copying gl_framebuffer size because for certain target types
  53  * (like PIPE_TEXTURE_1D_ARRAY) gl_framebuffer::Height has the number of layers
  54  * instead of 1.
  55  */
  56 static void
  57 update_framebuffer_size(struct pipe_framebuffer_state *framebuffer,
  58                         struct pipe_surface *surface)
  59 {
  60    assert(surface);
  61    assert(surface->width  < UINT_MAX);
  62    assert(surface->height < UINT_MAX);
  63    framebuffer->width  = MIN2(framebuffer->width,  surface->width);
  64    framebuffer->height = MIN2(framebuffer->height, surface->height);
  65 }
  66
  67
  68 /**
  69  * Update framebuffer state (color, depth, stencil, etc. buffers)
  70  */
  71 static void
  72 update_framebuffer_state( struct st_context *st )
  73 {
  74    struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
  75    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
  76    struct st_renderbuffer *strb;
  77    GLuint i;
  78
  79    st_flush_bitmap_cache(st);
  80
  81    st->state.fb_orientation = st_fb_orientation(fb);
  82    framebuffer->width  = UINT_MAX;
  83    framebuffer->height = UINT_MAX;
  84
  85    /*printf("------ fb size %d x %d\n", fb->Width, fb->Height);*/
  86
  87    /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
  88     * to determine which surfaces to draw to
  89     */
  90    framebuffer->nr_cbufs = fb->_NumColorDrawBuffers;
  91
  92    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
  93       pipe_surface_reference(&framebuffer->cbufs[i], NULL);
  94
  95       strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
  96
  97       if (strb) {
  98          if (strb->is_rtt || (strb->texture &&
  99              _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB)) {
 100             /* rendering to a GL texture, may have to update surface */
 101             st_update_renderbuffer_surface(st, strb);
 102          }
 103
 104          if (strb->surface) {
 105             pipe_surface_reference(&framebuffer->cbufs[i], strb->surface);
 106             update_framebuffer_size(framebuffer, strb->surface);
 107          }
 108          strb->defined = GL_TRUE; /* we'll be drawing something */
 109       }
 110    }
 111
 112    for (i = framebuffer->nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
 113       pipe_surface_reference(&framebuffer->cbufs[i], NULL);
 114    }
 115
 116    /* Remove trailing GL_NONE draw buffers. */
 117    while (framebuffer->nr_cbufs &&
 118           !framebuffer->cbufs[framebuffer->nr_cbufs-1]) {
 119       framebuffer->nr_cbufs--;
 120    }
 121
 122    /*
 123     * Depth/Stencil renderbuffer/surface.
 124     */
 125    strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 126    if (strb) {
 127       if (strb->is_rtt) {
 128          /* rendering to a GL texture, may have to update surface */
 129          st_update_renderbuffer_surface(st, strb);
 130       }
 131       pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
 132       update_framebuffer_size(framebuffer, strb->surface);
 133    }
 134    else {
 135       strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 136       if (strb) {
 137          assert(strb->surface);
 138          pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
 139          update_framebuffer_size(framebuffer, strb->surface);
 140       }
 141       else
 142          pipe_surface_reference(&framebuffer->zsbuf, NULL);
 143    }
 144
 145 #ifdef DEBUG
 146    /* Make sure the resource binding flags were set properly */
 147    for (i = 0; i < framebuffer->nr_cbufs; i++) {
 148       assert(!framebuffer->cbufs[i] ||
 149              framebuffer->cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
 150    }
 151    if (framebuffer->zsbuf) {
 152       assert(framebuffer->zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
 153    }
 154 #endif
 155
 156    if (framebuffer->width == UINT_MAX)
 157       framebuffer->width = 0;
 158    if (framebuffer->height == UINT_MAX)
 159       framebuffer->height = 0;
 160
 161    cso_set_framebuffer(st->cso_context, framebuffer);
 162 }
 163
 164
 165 const struct st_tracked_state st_update_framebuffer = {
 166    "st_update_framebuffer",                             /* name */
 167    {                                                    /* dirty */
 168       _NEW_BUFFERS,                                     /* mesa */
 169       ST_NEW_FRAMEBUFFER,                               /* st */
 170    },
 171    update_framebuffer_state                             /* update */
 172 };
 173