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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@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.          if (strb->is_rtt) {
  138.             /* rendering to a GL texture, may have to update surface */
  139.             st_update_renderbuffer_surface(st, strb);
  140.          }
  141.          pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
  142.          update_framebuffer_size(framebuffer, strb->surface);
  143.       }
  144.       else
  145.          pipe_surface_reference(&framebuffer->zsbuf, NULL);
  146.    }
  147.  
  148. #ifdef DEBUG
  149.    /* Make sure the resource binding flags were set properly */
  150.    for (i = 0; i < framebuffer->nr_cbufs; i++) {
  151.       assert(!framebuffer->cbufs[i] ||
  152.              framebuffer->cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
  153.    }
  154.    if (framebuffer->zsbuf) {
  155.       assert(framebuffer->zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
  156.    }
  157. #endif
  158.  
  159.    if (framebuffer->width == UINT_MAX)
  160.       framebuffer->width = 0;
  161.    if (framebuffer->height == UINT_MAX)
  162.       framebuffer->height = 0;
  163.  
  164.    cso_set_framebuffer(st->cso_context, framebuffer);
  165. }
  166.  
  167.  
  168. const struct st_tracked_state st_update_framebuffer = {
  169.    "st_update_framebuffer",                             /* name */
  170.    {                                                    /* dirty */
  171.       _NEW_BUFFERS,                                     /* mesa */
  172.       ST_NEW_FRAMEBUFFER,                               /* st */
  173.    },
  174.    update_framebuffer_state                             /* update */
  175. };
  176.  
  177.