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