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 */
59 static void
update_framebuffer_size(struct pipe_framebuffer_state * framebuffer,struct pipe_surface * surface)60 update_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 */
73 static unsigned
framebuffer_quantize_num_samples(struct st_context * st,unsigned num_samples)74 framebuffer_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 */
109 void
st_update_framebuffer_state(struct st_context * st)110 st_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