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"
34 /* The clip VP defines the guardband region where expensive clipping is skipped
35 * and fragments are allowed to be generated and clipped out cheaply by the SF.
38 gen6_upload_clip_vp(struct brw_context
*brw
)
40 struct gl_context
*ctx
= &brw
->ctx
;
41 struct brw_clipper_viewport
*vp
;
43 vp
= brw_state_batch(brw
, AUB_TRACE_CLIP_VP_STATE
,
44 sizeof(*vp
), 32, &brw
->clip
.vp_offset
);
46 /* According to the "Vertex X,Y Clamping and Quantization" section of the
47 * Strips and Fans documentation, objects must not have a screen-space
48 * extents of over 8192 pixels, or they may be mis-rasterized. The maximum
49 * screen space coordinates of a small object may larger, but we have no
50 * way to enforce the object size other than through clipping.
52 * If you're surprised that we set clip to -gbx to +gbx and it seems like
53 * we'll end up with 16384 wide, note that for a 8192-wide render target,
54 * we'll end up with a normal (-1, 1) clip volume that just covers the
57 const float maximum_post_clamp_delta
= 8192;
58 float gbx
= maximum_post_clamp_delta
/ ctx
->ViewportArray
[0].Width
;
59 float gby
= maximum_post_clamp_delta
/ ctx
->ViewportArray
[0].Height
;
66 brw
->state
.dirty
.brw
|= BRW_NEW_CLIP_VP
;
69 const struct brw_tracked_state gen6_clip_vp
= {
71 .mesa
= _NEW_VIEWPORT
,
74 .emit
= gen6_upload_clip_vp
,
78 gen6_upload_sf_vp(struct brw_context
*brw
)
80 struct gl_context
*ctx
= &brw
->ctx
;
81 const GLfloat depth_scale
= 1.0F
/ ctx
->DrawBuffer
->_DepthMaxF
;
82 struct brw_sf_viewport
*sfv
;
83 GLfloat y_scale
, y_bias
;
84 const bool render_to_fbo
= _mesa_is_user_fbo(ctx
->DrawBuffer
);
85 const GLfloat
*v
= ctx
->ViewportArray
[0]._WindowMap
.m
;
87 sfv
= brw_state_batch(brw
, AUB_TRACE_SF_VP_STATE
,
88 sizeof(*sfv
), 32, &brw
->sf
.vp_offset
);
89 memset(sfv
, 0, sizeof(*sfv
));
97 y_bias
= ctx
->DrawBuffer
->Height
;
101 sfv
->viewport
.m00
= v
[MAT_SX
];
102 sfv
->viewport
.m11
= v
[MAT_SY
] * y_scale
;
103 sfv
->viewport
.m22
= v
[MAT_SZ
] * depth_scale
;
104 sfv
->viewport
.m30
= v
[MAT_TX
];
105 sfv
->viewport
.m31
= v
[MAT_TY
] * y_scale
+ y_bias
;
106 sfv
->viewport
.m32
= v
[MAT_TZ
] * depth_scale
;
108 brw
->state
.dirty
.brw
|= BRW_NEW_SF_VP
;
111 const struct brw_tracked_state gen6_sf_vp
= {
113 .mesa
= _NEW_BUFFERS
|
115 .brw
= BRW_NEW_BATCH
,
117 .emit
= gen6_upload_sf_vp
,
120 static void upload_viewport_state_pointers(struct brw_context
*brw
)
123 OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS
<< 16 | (4 - 2) |
124 GEN6_CC_VIEWPORT_MODIFY
|
125 GEN6_SF_VIEWPORT_MODIFY
|
126 GEN6_CLIP_VIEWPORT_MODIFY
);
127 OUT_BATCH(brw
->clip
.vp_offset
);
128 OUT_BATCH(brw
->sf
.vp_offset
);
129 OUT_BATCH(brw
->cc
.vp_offset
);
133 const struct brw_tracked_state gen6_viewport_state
= {
136 .brw
= BRW_NEW_BATCH
|
140 BRW_NEW_STATE_BASE_ADDRESS
,
142 .emit
= upload_viewport_state_pointers
,