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5 * Permission is hereby granted, free of charge, to any person obtaining a
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13 * The above copyright notice and this permission notice (including the
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18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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21 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 **************************************************************************/
29 * Framebuffer utility functions.
35 #include "pipe/p_screen.h"
36 #include "pipe/p_state.h"
37 #include "pipe/p_defines.h"
38 #include "util/u_inlines.h"
40 #include "util/u_memory.h"
41 #include "util/u_framebuffer.h"
45 * Compare pipe_framebuffer_state objects.
46 * \return TRUE if same, FALSE if different
49 util_framebuffer_state_equal(const struct pipe_framebuffer_state
*dst
,
50 const struct pipe_framebuffer_state
*src
)
54 if (dst
->width
!= src
->width
||
55 dst
->height
!= src
->height
)
58 if (dst
->samples
!= src
->samples
||
59 dst
->layers
!= src
->layers
)
62 if (dst
->nr_cbufs
!= src
->nr_cbufs
) {
66 for (i
= 0; i
< src
->nr_cbufs
; i
++) {
67 if (dst
->cbufs
[i
] != src
->cbufs
[i
]) {
72 if (dst
->zsbuf
!= src
->zsbuf
) {
81 * Copy framebuffer state from src to dst, updating refcounts.
84 util_copy_framebuffer_state(struct pipe_framebuffer_state
*dst
,
85 const struct pipe_framebuffer_state
*src
)
90 dst
->width
= src
->width
;
91 dst
->height
= src
->height
;
93 dst
->samples
= src
->samples
;
94 dst
->layers
= src
->layers
;
96 for (i
= 0; i
< src
->nr_cbufs
; i
++)
97 pipe_surface_reference(&dst
->cbufs
[i
], src
->cbufs
[i
]);
99 /* Set remaining dest cbuf pointers to NULL */
100 for ( ; i
< ARRAY_SIZE(dst
->cbufs
); i
++)
101 pipe_surface_reference(&dst
->cbufs
[i
], NULL
);
103 dst
->nr_cbufs
= src
->nr_cbufs
;
105 pipe_surface_reference(&dst
->zsbuf
, src
->zsbuf
);
113 for (i
= 0 ; i
< ARRAY_SIZE(dst
->cbufs
); i
++)
114 pipe_surface_reference(&dst
->cbufs
[i
], NULL
);
118 pipe_surface_reference(&dst
->zsbuf
, NULL
);
124 util_unreference_framebuffer_state(struct pipe_framebuffer_state
*fb
)
128 for (i
= 0; i
< fb
->nr_cbufs
; i
++) {
129 pipe_surface_reference(&fb
->cbufs
[i
], NULL
);
132 pipe_surface_reference(&fb
->zsbuf
, NULL
);
134 fb
->samples
= fb
->layers
= 0;
135 fb
->width
= fb
->height
= 0;
140 /* Where multiple sizes are allowed for framebuffer surfaces, find the
141 * minimum width and height of all bound surfaces.
144 util_framebuffer_min_size(const struct pipe_framebuffer_state
*fb
,
152 for (i
= 0; i
< fb
->nr_cbufs
; i
++) {
156 w
= MIN2(w
, fb
->cbufs
[i
]->width
);
157 h
= MIN2(h
, fb
->cbufs
[i
]->height
);
161 w
= MIN2(w
, fb
->zsbuf
->width
);
162 h
= MIN2(h
, fb
->zsbuf
->height
);
179 * Return the number of layers set in the framebuffer state.
182 util_framebuffer_get_num_layers(const struct pipe_framebuffer_state
*fb
)
184 unsigned i
, num_layers
= 0;
187 * In the case of ARB_framebuffer_no_attachment
188 * we obtain the number of layers directly from
189 * the framebuffer state.
191 if (!(fb
->nr_cbufs
|| fb
->zsbuf
))
194 for (i
= 0; i
< fb
->nr_cbufs
; i
++) {
196 unsigned num
= fb
->cbufs
[i
]->u
.tex
.last_layer
-
197 fb
->cbufs
[i
]->u
.tex
.first_layer
+ 1;
198 num_layers
= MAX2(num_layers
, num
);
202 unsigned num
= fb
->zsbuf
->u
.tex
.last_layer
-
203 fb
->zsbuf
->u
.tex
.first_layer
+ 1;
204 num_layers
= MAX2(num_layers
, num
);
211 * Return the number of MSAA samples.
214 util_framebuffer_get_num_samples(const struct pipe_framebuffer_state
*fb
)
219 * In the case of ARB_framebuffer_no_attachment
220 * we obtain the number of samples directly from
221 * the framebuffer state.
223 * NOTE: fb->samples may wind up as zero due to memset()'s on internal
224 * driver structures on their initialization and so we take the
225 * MAX here to ensure we have a valid number of samples. However,
226 * if samples is legitimately not getting set somewhere
227 * multi-sampling will evidently break.
229 if (!(fb
->nr_cbufs
|| fb
->zsbuf
))
230 return MAX2(fb
->samples
, 1);
232 for (i
= 0; i
< fb
->nr_cbufs
; i
++) {
234 return MAX2(1, fb
->cbufs
[i
]->texture
->nr_samples
);
238 return MAX2(1, fb
->zsbuf
->texture
->nr_samples
);
246 * Flip the sample location state along the Y axis.
249 util_sample_locations_flip_y(struct pipe_screen
*screen
, unsigned fb_height
,
250 unsigned samples
, uint8_t *locations
)
252 unsigned row
, i
, shift
, grid_width
, grid_height
;
253 uint8_t new_locations
[
254 PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE
*
255 PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE
* 32];
257 screen
->get_sample_pixel_grid(screen
, samples
, &grid_width
, &grid_height
);
259 shift
= fb_height
% grid_height
;
261 for (row
= 0; row
< grid_height
; row
++) {
262 unsigned row_size
= grid_width
* samples
;
263 for (i
= 0; i
< row_size
; i
++) {
264 unsigned dest_row
= grid_height
- row
- 1;
265 /* this relies on unsigned integer wraparound behaviour */
266 dest_row
= (dest_row
- shift
) % grid_height
;
267 new_locations
[dest_row
* row_size
+ i
] = locations
[row
* row_size
+ i
];
271 memcpy(locations
, new_locations
, grid_width
* grid_height
* samples
);