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"
34 #include "main/viewport.h"
36 /* The clip VP defines the guardband region where expensive clipping is skipped
37 * and fragments are allowed to be generated and clipped out cheaply by the SF.
40 gen6_upload_clip_vp(struct brw_context
*brw
)
42 struct gl_context
*ctx
= &brw
->ctx
;
43 struct brw_clipper_viewport
*vp
;
45 vp
= brw_state_batch(brw
, AUB_TRACE_CLIP_VP_STATE
,
46 sizeof(*vp
) * ctx
->Const
.MaxViewports
, 32, &brw
->clip
.vp_offset
);
48 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
49 /* According to the "Vertex X,Y Clamping and Quantization" section of the
50 * Strips and Fans documentation, objects must not have a screen-space
51 * extents of over 8192 pixels, or they may be mis-rasterized. The maximum
52 * screen space coordinates of a small object may larger, but we have no
53 * way to enforce the object size other than through clipping.
55 * If you're surprised that we set clip to -gbx to +gbx and it seems like
56 * we'll end up with 16384 wide, note that for a 8192-wide render target,
57 * we'll end up with a normal (-1, 1) clip volume that just covers the
60 const float maximum_post_clamp_delta
= 8192;
61 float gbx
= maximum_post_clamp_delta
/ ctx
->ViewportArray
[i
].Width
;
62 float gby
= maximum_post_clamp_delta
/ ctx
->ViewportArray
[i
].Height
;
70 brw
->ctx
.NewDriverState
|= BRW_NEW_CLIP_VP
;
73 const struct brw_tracked_state gen6_clip_vp
= {
75 .mesa
= _NEW_VIEWPORT
,
78 .emit
= gen6_upload_clip_vp
,
82 gen6_upload_sf_vp(struct brw_context
*brw
)
84 struct gl_context
*ctx
= &brw
->ctx
;
85 struct gen6_sf_viewport
*sfv
;
86 GLfloat y_scale
, y_bias
;
87 const bool render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
);
89 sfv
= brw_state_batch(brw
, AUB_TRACE_SF_VP_STATE
,
90 sizeof(*sfv
) * ctx
->Const
.MaxViewports
,
91 32, &brw
->sf
.vp_offset
);
92 memset(sfv
, 0, sizeof(*sfv
) * ctx
->Const
.MaxViewports
);
100 y_bias
= (float)_mesa_geometric_height(ctx
->DrawBuffer
);
103 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
104 double scale
[3], translate
[3];
107 _mesa_get_viewport_xform(ctx
, i
, scale
, translate
);
108 sfv
[i
].m00
= scale
[0];
109 sfv
[i
].m11
= scale
[1] * y_scale
;
110 sfv
[i
].m22
= scale
[2];
111 sfv
[i
].m30
= translate
[0];
112 sfv
[i
].m31
= translate
[1] * y_scale
+ y_bias
;
113 sfv
[i
].m32
= translate
[2];
117 brw
->ctx
.NewDriverState
|= BRW_NEW_SF_VP
;
120 const struct brw_tracked_state gen6_sf_vp
= {
122 .mesa
= _NEW_BUFFERS
|
124 .brw
= BRW_NEW_BATCH
,
126 .emit
= gen6_upload_sf_vp
,
129 static void upload_viewport_state_pointers(struct brw_context
*brw
)
132 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS
<< 16 | (4 - 2) |
133 GEN6_CC_VIEWPORT_MODIFY
|
134 GEN6_SF_VIEWPORT_MODIFY
|
135 GEN6_CLIP_VIEWPORT_MODIFY
);
136 OUT_BATCH(brw
->clip
.vp_offset
);
137 OUT_BATCH(brw
->sf
.vp_offset
);
138 OUT_BATCH(brw
->cc
.vp_offset
);
142 const struct brw_tracked_state gen6_viewport_state
= {
145 .brw
= BRW_NEW_BATCH
|
149 BRW_NEW_STATE_BASE_ADDRESS
,
151 .emit
= upload_viewport_state_pointers
,