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/viewport.h"
35 /* The clip VP defines the guardband region where expensive clipping is skipped
36 * and fragments are allowed to be generated and clipped out cheaply by the SF.
39 gen6_upload_clip_vp(struct brw_context
*brw
)
41 struct gl_context
*ctx
= &brw
->ctx
;
42 struct brw_clipper_viewport
*vp
;
44 vp
= brw_state_batch(brw
, AUB_TRACE_CLIP_VP_STATE
,
45 sizeof(*vp
) * ctx
->Const
.MaxViewports
, 32, &brw
->clip
.vp_offset
);
47 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
48 /* According to the "Vertex X,Y Clamping and Quantization" section of the
49 * Strips and Fans documentation, objects must not have a screen-space
50 * extents of over 8192 pixels, or they may be mis-rasterized. The maximum
51 * screen space coordinates of a small object may larger, but we have no
52 * way to enforce the object size other than through clipping.
54 * If you're surprised that we set clip to -gbx to +gbx and it seems like
55 * we'll end up with 16384 wide, note that for a 8192-wide render target,
56 * we'll end up with a normal (-1, 1) clip volume that just covers the
59 const float maximum_post_clamp_delta
= 8192;
60 float gbx
= maximum_post_clamp_delta
/ ctx
->ViewportArray
[i
].Width
;
61 float gby
= maximum_post_clamp_delta
/ ctx
->ViewportArray
[i
].Height
;
69 brw
->ctx
.NewDriverState
|= BRW_NEW_CLIP_VP
;
72 const struct brw_tracked_state gen6_clip_vp
= {
74 .mesa
= _NEW_VIEWPORT
,
77 .emit
= gen6_upload_clip_vp
,
81 gen6_upload_sf_vp(struct brw_context
*brw
)
83 struct gl_context
*ctx
= &brw
->ctx
;
84 struct gen6_sf_viewport
*sfv
;
85 GLfloat y_scale
, y_bias
;
86 const bool render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
);
88 sfv
= brw_state_batch(brw
, AUB_TRACE_SF_VP_STATE
,
89 sizeof(*sfv
) * ctx
->Const
.MaxViewports
,
90 32, &brw
->sf
.vp_offset
);
91 memset(sfv
, 0, sizeof(*sfv
) * ctx
->Const
.MaxViewports
);
99 y_bias
= ctx
->DrawBuffer
->Height
;
102 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
103 double scale
[3], translate
[3];
106 _mesa_get_viewport_xform(ctx
, i
, scale
, translate
);
107 sfv
[i
].m00
= scale
[0];
108 sfv
[i
].m11
= scale
[1] * y_scale
;
109 sfv
[i
].m22
= scale
[2];
110 sfv
[i
].m30
= translate
[0];
111 sfv
[i
].m31
= translate
[1] * y_scale
+ y_bias
;
112 sfv
[i
].m32
= translate
[2];
116 brw
->ctx
.NewDriverState
|= BRW_NEW_SF_VP
;
119 const struct brw_tracked_state gen6_sf_vp
= {
121 .mesa
= _NEW_BUFFERS
|
123 .brw
= BRW_NEW_BATCH
,
125 .emit
= gen6_upload_sf_vp
,
128 static void upload_viewport_state_pointers(struct brw_context
*brw
)
131 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS
<< 16 | (4 - 2) |
132 GEN6_CC_VIEWPORT_MODIFY
|
133 GEN6_SF_VIEWPORT_MODIFY
|
134 GEN6_CLIP_VIEWPORT_MODIFY
);
135 OUT_BATCH(brw
->clip
.vp_offset
);
136 OUT_BATCH(brw
->sf
.vp_offset
);
137 OUT_BATCH(brw
->cc
.vp_offset
);
141 const struct brw_tracked_state gen6_viewport_state
= {
144 .brw
= BRW_NEW_BATCH
|
148 BRW_NEW_STATE_BASE_ADDRESS
,
150 .emit
= upload_viewport_state_pointers
,