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 "st_util.h"
42#include "pipe/p_context.h"
43#include "cso_cache/cso_context.h"
44#include "util/u_math.h"
45#include "util/u_inlines.h"
46#include "util/format/u_format.h"
47#include "util/u_framebuffer.h"
48#include "main/framebuffer.h"
49
50
51/**
52 * Update framebuffer size.
53 *
54 * We need to derive pipe_framebuffer size from the bound pipe_surfaces here
55 * instead of copying gl_framebuffer size because for certain target types
56 * (like PIPE_TEXTURE_1D_ARRAY) gl_framebuffer::Height has the number of layers
57 * instead of 1.
58 */
59static void
60update_framebuffer_size(struct pipe_framebuffer_state *framebuffer,
61                        struct pipe_surface *surface)
62{
63   assert(surface);
64   assert(surface->width  < USHRT_MAX);
65   assert(surface->height < USHRT_MAX);
66   framebuffer->width  = MIN2(framebuffer->width,  surface->width);
67   framebuffer->height = MIN2(framebuffer->height, surface->height);
68}
69
70/**
71 * Round up the requested multisample count to the next supported sample size.
72 */
73static unsigned
74framebuffer_quantize_num_samples(struct st_context *st, unsigned num_samples)
75{
76   struct pipe_screen *screen = st->screen;
77   int quantized_samples = 0;
78   unsigned msaa_mode;
79
80   if (!num_samples)
81      return 0;
82
83   /* Assumes the highest supported MSAA is a power of 2 */
84   msaa_mode = util_next_power_of_two(st->ctx->Const.MaxFramebufferSamples);
85   assert(!(num_samples > msaa_mode)); /* be safe from infinite loops */
86
87   /**
88    * Check if the MSAA mode that is higher than the requested
89    * num_samples is supported, and if so returning it.
90    */
91   for (; msaa_mode >= num_samples; msaa_mode = msaa_mode / 2) {
92      /**
93       * For ARB_framebuffer_no_attachment, A format of
94       * PIPE_FORMAT_NONE implies what number of samples is
95       * supported for a framebuffer with no attachment. Thus the
96       * drivers callback must be adjusted for this.
97       */
98      if (screen->is_format_supported(screen, PIPE_FORMAT_NONE,
99                                      PIPE_TEXTURE_2D, msaa_mode, msaa_mode,
100                                      PIPE_BIND_RENDER_TARGET))
101         quantized_samples = msaa_mode;
102   }
103   return quantized_samples;
104}
105
106/**
107 * Update framebuffer state (color, depth, stencil, etc. buffers)
108 */
109void
110st_update_framebuffer_state( struct st_context *st )
111{
112   struct pipe_framebuffer_state framebuffer;
113   struct gl_framebuffer *fb = st->ctx->DrawBuffer;
114   struct st_renderbuffer *strb;
115   GLuint i;
116
117   st_flush_bitmap_cache(st);
118   st_invalidate_readpix_cache(st);
119
120   st->state.fb_orientation = st_fb_orientation(fb);
121
122   /**
123    * Quantize the derived default number of samples:
124    *
125    * A query to the driver of supported MSAA values the
126    * hardware supports is done as to legalize the number
127    * of application requested samples, NumSamples.
128    * See commit eb9cf3c for more information.
129    */
130   fb->DefaultGeometry._NumSamples =
131      framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
132
133   framebuffer.width  = _mesa_geometric_width(fb);
134   framebuffer.height = _mesa_geometric_height(fb);
135   framebuffer.samples = _mesa_geometric_samples(fb);
136   framebuffer.layers = _mesa_geometric_layers(fb);
137
138   /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
139    * to determine which surfaces to draw to
140    */
141   framebuffer.nr_cbufs = fb->_NumColorDrawBuffers;
142
143   for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
144      framebuffer.cbufs[i] = NULL;
145      strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
146
147      if (strb) {
148         if (strb->is_rtt || (strb->texture &&
149             _mesa_is_format_srgb(strb->Base.Format))) {
150            /* rendering to a GL texture, may have to update surface */
151            st_update_renderbuffer_surface(st, strb);
152         }
153
154         if (strb->surface) {
155            if (strb->surface->context != st->pipe) {
156               st_regen_renderbuffer_surface(st, strb);
157            }
158            framebuffer.cbufs[i] = strb->surface;
159            update_framebuffer_size(&framebuffer, strb->surface);
160         }
161         strb->defined = GL_TRUE; /* we'll be drawing something */
162      }
163   }
164
165   for (i = framebuffer.nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
166      framebuffer.cbufs[i] = NULL;
167   }
168
169   /* Remove trailing GL_NONE draw buffers. */
170   while (framebuffer.nr_cbufs &&
171          !framebuffer.cbufs[framebuffer.nr_cbufs-1]) {
172      framebuffer.nr_cbufs--;
173   }
174
175   /*
176    * Depth/Stencil renderbuffer/surface.
177    */
178   strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
179   if (!strb)
180      strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
181
182   if (strb) {
183      if (strb->is_rtt) {
184         /* rendering to a GL texture, may have to update surface */
185         st_update_renderbuffer_surface(st, strb);
186      }
187      if (strb->surface && strb->surface->context != st->pipe) {
188         st_regen_renderbuffer_surface(st, strb);
189      }
190      framebuffer.zsbuf = strb->surface;
191      if (strb->surface)
192         update_framebuffer_size(&framebuffer, strb->surface);
193   }
194   else
195      framebuffer.zsbuf = NULL;
196
197#ifndef NDEBUG
198   /* Make sure the resource binding flags were set properly */
199   for (i = 0; i < framebuffer.nr_cbufs; i++) {
200      assert(!framebuffer.cbufs[i] ||
201             framebuffer.cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
202   }
203   if (framebuffer.zsbuf) {
204      assert(framebuffer.zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
205   }
206#endif
207
208   if (framebuffer.width == USHRT_MAX)
209      framebuffer.width = 0;
210   if (framebuffer.height == USHRT_MAX)
211      framebuffer.height = 0;
212
213   cso_set_framebuffer(st->cso_context, &framebuffer);
214
215   st->state.fb_width = framebuffer.width;
216   st->state.fb_height = framebuffer.height;
217   st->state.fb_num_samples = util_framebuffer_get_num_samples(&framebuffer);
218   st->state.fb_num_layers = util_framebuffer_get_num_layers(&framebuffer);
219   st->state.fb_num_cb = framebuffer.nr_cbufs;
220}
221