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 "util/u_framebuffer.h"
47 #include "main/framebuffer.h"
48
49
50 /**
51 * Update framebuffer size.
52 *
53 * We need to derive pipe_framebuffer size from the bound pipe_surfaces here
54 * instead of copying gl_framebuffer size because for certain target types
55 * (like PIPE_TEXTURE_1D_ARRAY) gl_framebuffer::Height has the number of layers
56 * instead of 1.
57 */
58 static void
update_framebuffer_size(struct pipe_framebuffer_state * framebuffer,struct pipe_surface * surface)59 update_framebuffer_size(struct pipe_framebuffer_state *framebuffer,
60 struct pipe_surface *surface)
61 {
62 assert(surface);
63 assert(surface->width < USHRT_MAX);
64 assert(surface->height < USHRT_MAX);
65 framebuffer->width = MIN2(framebuffer->width, surface->width);
66 framebuffer->height = MIN2(framebuffer->height, surface->height);
67 }
68
69 /**
70 * Round up the requested multisample count to the next supported sample size.
71 */
72 static unsigned
framebuffer_quantize_num_samples(struct st_context * st,unsigned num_samples)73 framebuffer_quantize_num_samples(struct st_context *st, unsigned num_samples)
74 {
75 struct pipe_screen *screen = st->pipe->screen;
76 int quantized_samples = 0;
77 unsigned msaa_mode;
78
79 if (!num_samples)
80 return 0;
81
82 /* Assumes the highest supported MSAA is a power of 2 */
83 msaa_mode = util_next_power_of_two(st->ctx->Const.MaxFramebufferSamples);
84 assert(!(num_samples > msaa_mode)); /* be safe from infinite loops */
85
86 /**
87 * Check if the MSAA mode that is higher than the requested
88 * num_samples is supported, and if so returning it.
89 */
90 for (; msaa_mode >= num_samples; msaa_mode = msaa_mode / 2) {
91 /**
92 * For ARB_framebuffer_no_attachment, A format of
93 * PIPE_FORMAT_NONE implies what number of samples is
94 * supported for a framebuffer with no attachment. Thus the
95 * drivers callback must be adjusted for this.
96 */
97 if (screen->is_format_supported(screen, PIPE_FORMAT_NONE,
98 PIPE_TEXTURE_2D, msaa_mode,
99 PIPE_BIND_RENDER_TARGET))
100 quantized_samples = msaa_mode;
101 }
102 return quantized_samples;
103 }
104
105 /**
106 * Update framebuffer state (color, depth, stencil, etc. buffers)
107 */
108 void
st_update_framebuffer_state(struct st_context * st)109 st_update_framebuffer_state( struct st_context *st )
110 {
111 struct pipe_framebuffer_state framebuffer;
112 struct gl_framebuffer *fb = st->ctx->DrawBuffer;
113 struct st_renderbuffer *strb;
114 GLuint i;
115
116 st_flush_bitmap_cache(st);
117 st_invalidate_readpix_cache(st);
118
119 st->state.fb_orientation = st_fb_orientation(fb);
120
121 /**
122 * Quantize the derived default number of samples:
123 *
124 * A query to the driver of supported MSAA values the
125 * hardware supports is done as to legalize the number
126 * of application requested samples, NumSamples.
127 * See commit eb9cf3c for more information.
128 */
129 fb->DefaultGeometry._NumSamples =
130 framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
131
132 framebuffer.width = _mesa_geometric_width(fb);
133 framebuffer.height = _mesa_geometric_height(fb);
134 framebuffer.samples = _mesa_geometric_samples(fb);
135 framebuffer.layers = _mesa_geometric_layers(fb);
136
137 /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
138 * to determine which surfaces to draw to
139 */
140 framebuffer.nr_cbufs = fb->_NumColorDrawBuffers;
141
142 for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
143 framebuffer.cbufs[i] = NULL;
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 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 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 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 framebuffer.zsbuf = strb->surface;
191 update_framebuffer_size(&framebuffer, strb->surface);
192 }
193 else
194 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 == 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 }
220