2 * Copyright © 2011 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 #include "brw_context.h"
25 #include "brw_state.h"
26 #include "brw_defines.h"
27 #include "intel_batchbuffer.h"
28 #include "main/fbobject.h"
29 #include "main/framebuffer.h"
30 #include "main/viewport.h"
33 gen7_upload_sf_clip_viewport(struct brw_context
*brw
)
35 struct gl_context
*ctx
= &brw
->ctx
;
36 GLfloat y_scale
, y_bias
;
37 const bool render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
);
38 struct gen7_sf_clip_viewport
*vp
;
40 vp
= brw_state_batch(brw
, AUB_TRACE_SF_VP_STATE
,
41 sizeof(*vp
) * ctx
->Const
.MaxViewports
, 64,
43 /* Also assign to clip.vp_offset in case something uses it. */
44 brw
->clip
.vp_offset
= brw
->sf
.vp_offset
;
52 y_bias
= (float)_mesa_geometric_height(ctx
->DrawBuffer
);
55 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
56 float scale
[3], translate
[3];
57 _mesa_get_viewport_xform(ctx
, i
, scale
, translate
);
59 /* According to the "Vertex X,Y Clamping and Quantization" section of
60 * the Strips and Fans documentation, objects must not have a
61 * screen-space extents of over 8192 pixels, or they may be
62 * mis-rasterized. The maximum screen space coordinates of a small
63 * object may larger, but we have no way to enforce the object size
64 * other than through clipping.
66 * If you're surprised that we set clip to -gbx to +gbx and it seems
67 * like we'll end up with 16384 wide, note that for a 8192-wide render
68 * target, we'll end up with a normal (-1, 1) clip volume that just
69 * covers the drawable.
71 const float maximum_guardband_extent
= 8192;
72 const float gbx
= maximum_guardband_extent
/ ctx
->ViewportArray
[i
].Width
;
73 const float gby
= maximum_guardband_extent
/ ctx
->ViewportArray
[i
].Height
;
75 vp
[i
].guardband
.xmin
= -gbx
;
76 vp
[i
].guardband
.xmax
= gbx
;
77 vp
[i
].guardband
.ymin
= -gby
;
78 vp
[i
].guardband
.ymax
= gby
;
81 vp
[i
].viewport
.m00
= scale
[0];
82 vp
[i
].viewport
.m11
= scale
[1] * y_scale
;
83 vp
[i
].viewport
.m22
= scale
[2];
84 vp
[i
].viewport
.m30
= translate
[0];
85 vp
[i
].viewport
.m31
= translate
[1] * y_scale
+ y_bias
;
86 vp
[i
].viewport
.m32
= translate
[2];
90 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL
<< 16 | (2 - 2));
91 OUT_BATCH(brw
->sf
.vp_offset
);
95 const struct brw_tracked_state gen7_sf_clip_viewport
= {
97 .mesa
= _NEW_BUFFERS
|
99 .brw
= BRW_NEW_BATCH
|
102 .emit
= gen7_upload_sf_clip_viewport
,