1 /**************************************************************************
3 * Copyright 2007 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
30 * Keith Whitwell <keithw@vmware.com>
36 #include "st_context.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"
51 * Update framebuffer size.
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
59 update_framebuffer_size(struct pipe_framebuffer_state
*framebuffer
,
60 struct pipe_surface
*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
);
70 * Round up the requested multisample count to the next supported sample size.
73 framebuffer_quantize_num_samples(struct st_context
*st
, unsigned num_samples
)
75 struct pipe_screen
*screen
= st
->pipe
->screen
;
76 int quantized_samples
= 0;
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 */
87 * Check if the MSAA mode that is higher than the requested
88 * num_samples is supported, and if so returning it.
90 for (; msaa_mode
>= num_samples
; msaa_mode
= msaa_mode
/ 2) {
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.
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
;
102 return quantized_samples
;
106 * Update framebuffer state (color, depth, stencil, etc. buffers)
109 st_update_framebuffer_state( struct st_context
*st
)
111 struct pipe_framebuffer_state framebuffer
;
112 struct gl_framebuffer
*fb
= st
->ctx
->DrawBuffer
;
113 struct st_renderbuffer
*strb
;
116 st_flush_bitmap_cache(st
);
117 st_invalidate_readpix_cache(st
);
119 st
->state
.fb_orientation
= st_fb_orientation(fb
);
122 * Quantize the derived default number of samples:
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.
129 fb
->DefaultGeometry
._NumSamples
=
130 framebuffer_quantize_num_samples(st
, fb
->DefaultGeometry
.NumSamples
);
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
);
137 /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
138 * to determine which surfaces to draw to
140 framebuffer
.nr_cbufs
= fb
->_NumColorDrawBuffers
;
142 for (i
= 0; i
< fb
->_NumColorDrawBuffers
; i
++) {
143 framebuffer
.cbufs
[i
] = NULL
;
144 strb
= st_renderbuffer(fb
->_ColorDrawBuffers
[i
]);
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
);
154 framebuffer
.cbufs
[i
] = strb
->surface
;
155 update_framebuffer_size(&framebuffer
, strb
->surface
);
157 strb
->defined
= GL_TRUE
; /* we'll be drawing something */
161 for (i
= framebuffer
.nr_cbufs
; i
< PIPE_MAX_COLOR_BUFS
; i
++) {
162 framebuffer
.cbufs
[i
] = NULL
;
165 /* Remove trailing GL_NONE draw buffers. */
166 while (framebuffer
.nr_cbufs
&&
167 !framebuffer
.cbufs
[framebuffer
.nr_cbufs
-1]) {
168 framebuffer
.nr_cbufs
--;
172 * Depth/Stencil renderbuffer/surface.
174 strb
= st_renderbuffer(fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
);
176 strb
= st_renderbuffer(fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
);
180 /* rendering to a GL texture, may have to update surface */
181 st_update_renderbuffer_surface(st
, strb
);
183 framebuffer
.zsbuf
= strb
->surface
;
184 update_framebuffer_size(&framebuffer
, strb
->surface
);
187 framebuffer
.zsbuf
= NULL
;
190 /* Make sure the resource binding flags were set properly */
191 for (i
= 0; i
< framebuffer
.nr_cbufs
; i
++) {
192 assert(!framebuffer
.cbufs
[i
] ||
193 framebuffer
.cbufs
[i
]->texture
->bind
& PIPE_BIND_RENDER_TARGET
);
195 if (framebuffer
.zsbuf
) {
196 assert(framebuffer
.zsbuf
->texture
->bind
& PIPE_BIND_DEPTH_STENCIL
);
200 if (framebuffer
.width
== USHRT_MAX
)
201 framebuffer
.width
= 0;
202 if (framebuffer
.height
== USHRT_MAX
)
203 framebuffer
.height
= 0;
205 cso_set_framebuffer(st
->cso_context
, &framebuffer
);
207 st
->state
.fb_width
= framebuffer
.width
;
208 st
->state
.fb_height
= framebuffer
.height
;
209 st
->state
.fb_num_samples
= util_framebuffer_get_num_samples(&framebuffer
);
210 st
->state
.fb_num_layers
= util_framebuffer_get_num_layers(&framebuffer
);
211 st
->state
.fb_num_cb
= framebuffer
.nr_cbufs
;