2 * Copyright © 2009 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
28 #include "brw_context.h"
29 #include "brw_state.h"
30 #include "brw_defines.h"
31 #include "intel_batchbuffer.h"
32 #include "main/fbobject.h"
33 #include "main/framebuffer.h"
36 gen6_upload_scissor_state(struct brw_context
*brw
)
38 struct gl_context
*ctx
= &brw
->ctx
;
39 const bool render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
);
40 struct gen6_scissor_rect
*scissor
;
41 uint32_t scissor_state_offset
;
42 const unsigned int fb_width
= _mesa_geometric_width(ctx
->DrawBuffer
);
43 const unsigned int fb_height
= _mesa_geometric_height(ctx
->DrawBuffer
);
45 scissor
= brw_state_batch(brw
, AUB_TRACE_SCISSOR_STATE
,
46 sizeof(*scissor
) * ctx
->Const
.MaxViewports
, 32,
47 &scissor_state_offset
);
49 /* _NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT */
51 /* The scissor only needs to handle the intersection of drawable and
52 * scissor rect. Clipping to the boundaries of static shared buffers
53 * for front/back/depth is covered by looping over cliprects in brw_draw.c.
55 * Note that the hardware's coordinates are inclusive, while Mesa's min is
56 * inclusive but max is exclusive.
58 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
61 bbox
[0] = MAX2(ctx
->ViewportArray
[i
].X
, 0);
62 bbox
[1] = MIN2(bbox
[0] + ctx
->ViewportArray
[i
].Width
, fb_width
);
63 bbox
[2] = MAX2(ctx
->ViewportArray
[i
].Y
, 0);
64 bbox
[3] = MIN2(bbox
[2] + ctx
->ViewportArray
[i
].Height
, fb_height
);
65 _mesa_intersect_scissor_bounding_box(ctx
, i
, bbox
);
67 if (bbox
[0] == bbox
[1] || bbox
[2] == bbox
[3]) {
68 /* If the scissor was out of bounds and got clamped to 0 width/height
69 * at the bounds, the subtraction of 1 from maximums could produce a
70 * negative number and thus not clip anything. Instead, just provide
71 * a min > max scissor inside the bounds, which produces the expected
78 } else if (render_to_fbo
) {
79 /* texmemory: Y=0=bottom */
80 scissor
[i
].xmin
= bbox
[0];
81 scissor
[i
].xmax
= bbox
[1] - 1;
82 scissor
[i
].ymin
= bbox
[2];
83 scissor
[i
].ymax
= bbox
[3] - 1;
87 scissor
[i
].xmin
= bbox
[0];
88 scissor
[i
].xmax
= bbox
[1] - 1;
89 scissor
[i
].ymin
= fb_height
- bbox
[3];
90 scissor
[i
].ymax
= fb_height
- bbox
[2] - 1;
94 OUT_BATCH(_3DSTATE_SCISSOR_STATE_POINTERS
<< 16 | (2 - 2));
95 OUT_BATCH(scissor_state_offset
);
99 const struct brw_tracked_state gen6_scissor_state
= {
101 .mesa
= _NEW_BUFFERS
|
104 .brw
= BRW_NEW_BATCH
|
107 .emit
= gen6_upload_scissor_state
,