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"
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"
52 * Update framebuffer size.
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
60 update_framebuffer_size(struct pipe_framebuffer_state
*framebuffer
,
61 struct pipe_surface
*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
);
71 * Round up the requested multisample count to the next supported sample size.
74 framebuffer_quantize_num_samples(struct st_context
*st
, unsigned num_samples
)
76 struct pipe_screen
*screen
= st
->pipe
->screen
;
77 int quantized_samples
= 0;
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 */
88 * Check if the MSAA mode that is higher than the requested
89 * num_samples is supported, and if so returning it.
91 for (; msaa_mode
>= num_samples
; msaa_mode
= msaa_mode
/ 2) {
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.
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
;
103 return quantized_samples
;
107 * Update framebuffer state (color, depth, stencil, etc. buffers)
110 st_update_framebuffer_state( struct st_context
*st
)
112 struct pipe_framebuffer_state framebuffer
;
113 struct gl_framebuffer
*fb
= st
->ctx
->DrawBuffer
;
114 struct st_renderbuffer
*strb
;
117 st_flush_bitmap_cache(st
);
118 st_invalidate_readpix_cache(st
);
120 st
->state
.fb_orientation
= st_fb_orientation(fb
);
123 * Quantize the derived default number of samples:
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.
130 fb
->DefaultGeometry
._NumSamples
=
131 framebuffer_quantize_num_samples(st
, fb
->DefaultGeometry
.NumSamples
);
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
);
138 /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
139 * to determine which surfaces to draw to
141 framebuffer
.nr_cbufs
= fb
->_NumColorDrawBuffers
;
143 for (i
= 0; i
< fb
->_NumColorDrawBuffers
; i
++) {
144 framebuffer
.cbufs
[i
] = NULL
;
145 strb
= st_renderbuffer(fb
->_ColorDrawBuffers
[i
]);
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
);
155 framebuffer
.cbufs
[i
] = strb
->surface
;
156 update_framebuffer_size(&framebuffer
, strb
->surface
);
158 strb
->defined
= GL_TRUE
; /* we'll be drawing something */
162 for (i
= framebuffer
.nr_cbufs
; i
< PIPE_MAX_COLOR_BUFS
; i
++) {
163 framebuffer
.cbufs
[i
] = NULL
;
166 /* Remove trailing GL_NONE draw buffers. */
167 while (framebuffer
.nr_cbufs
&&
168 !framebuffer
.cbufs
[framebuffer
.nr_cbufs
-1]) {
169 framebuffer
.nr_cbufs
--;
173 * Depth/Stencil renderbuffer/surface.
175 strb
= st_renderbuffer(fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
);
177 strb
= st_renderbuffer(fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
);
181 /* rendering to a GL texture, may have to update surface */
182 st_update_renderbuffer_surface(st
, strb
);
184 framebuffer
.zsbuf
= strb
->surface
;
186 update_framebuffer_size(&framebuffer
, strb
->surface
);
189 framebuffer
.zsbuf
= NULL
;
192 /* Make sure the resource binding flags were set properly */
193 for (i
= 0; i
< framebuffer
.nr_cbufs
; i
++) {
194 assert(!framebuffer
.cbufs
[i
] ||
195 framebuffer
.cbufs
[i
]->texture
->bind
& PIPE_BIND_RENDER_TARGET
);
197 if (framebuffer
.zsbuf
) {
198 assert(framebuffer
.zsbuf
->texture
->bind
& PIPE_BIND_DEPTH_STENCIL
);
202 if (framebuffer
.width
== USHRT_MAX
)
203 framebuffer
.width
= 0;
204 if (framebuffer
.height
== USHRT_MAX
)
205 framebuffer
.height
= 0;
207 cso_set_framebuffer(st
->cso_context
, &framebuffer
);
209 st
->state
.fb_width
= framebuffer
.width
;
210 st
->state
.fb_height
= framebuffer
.height
;
211 st
->state
.fb_num_samples
= util_framebuffer_get_num_samples(&framebuffer
);
212 st
->state
.fb_num_layers
= util_framebuffer_get_num_layers(&framebuffer
);
213 st
->state
.fb_num_cb
= framebuffer
.nr_cbufs
;