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"
32 #include "intel_batchbuffer.h"
33 #include "main/fbobject.h"
36 upload_clip_state(struct brw_context
*brw
)
38 struct gl_context
*ctx
= &brw
->ctx
;
39 /* BRW_NEW_META_IN_PROGRESS */
40 uint32_t dw1
= brw
->meta_in_progress
? 0 : GEN6_CLIP_STATISTICS_ENABLE
;
44 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
46 /* CACHE_NEW_WM_PROG */
47 if (brw
->wm
.prog_data
->barycentric_interp_modes
&
48 BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS
) {
49 dw2
|= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE
;
53 dw1
|= GEN7_CLIP_EARLY_CULL
;
57 if ((ctx
->Polygon
.FrontFace
== GL_CCW
) ^ _mesa_is_user_fbo(fb
))
58 dw1
|= GEN7_CLIP_WINDING_CCW
;
60 if (ctx
->Polygon
.CullFlag
) {
61 switch (ctx
->Polygon
.CullFaceMode
) {
63 dw1
|= GEN7_CLIP_CULLMODE_FRONT
;
66 dw1
|= GEN7_CLIP_CULLMODE_BACK
;
68 case GL_FRONT_AND_BACK
:
69 dw1
|= GEN7_CLIP_CULLMODE_BOTH
;
72 unreachable("Should not get here: invalid CullFlag");
75 dw1
|= GEN7_CLIP_CULLMODE_NONE
;
79 if (brw
->gen
< 8 && !ctx
->Transform
.DepthClamp
)
80 dw2
|= GEN6_CLIP_Z_TEST
;
83 if (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
) {
85 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT
) |
86 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT
) |
87 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT
);
90 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT
) |
91 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT
) |
92 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT
);
96 dw2
|= (ctx
->Transform
.ClipPlanesEnabled
<<
97 GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT
);
99 dw2
|= GEN6_CLIP_GB_TEST
;
101 /* If the viewport dimensions are smaller than the drawable dimensions,
102 * we have to disable guardband clipping prior to Gen8. We always program
103 * the guardband to a fixed size, which is almost always larger than the
104 * viewport. Any geometry which intersects the viewport but lies within
105 * the guardband would bypass the 3D clipping stage, so it wouldn't be
106 * clipped to the viewport. Rendering would happen beyond the viewport,
107 * but still inside the drawable.
109 * Gen8+ introduces a viewport extents test which restricts rendering to
110 * the viewport, so we can ignore this restriction.
113 for (unsigned i
= 0; i
< ctx
->Const
.MaxViewports
; i
++) {
114 if (ctx
->ViewportArray
[i
].X
!= 0 ||
115 ctx
->ViewportArray
[i
].Y
!= 0 ||
116 ctx
->ViewportArray
[i
].Width
!= (float) fb
->Width
||
117 ctx
->ViewportArray
[i
].Height
!= (float) fb
->Height
) {
118 dw2
&= ~GEN6_CLIP_GB_TEST
;
124 /* BRW_NEW_RASTERIZER_DISCARD */
125 if (ctx
->RasterDiscard
) {
126 dw2
|= GEN6_CLIP_MODE_REJECT_ALL
;
127 perf_debug("Rasterizer discard is currently implemented via the clipper; "
128 "%s be faster.\n", brw
->gen
>= 7 ? "using the SOL unit may" :
129 "having the GS not write primitives would likely");
133 OUT_BATCH(_3DSTATE_CLIP
<< 16 | (4 - 2));
135 OUT_BATCH(GEN6_CLIP_ENABLE
|
137 GEN6_CLIP_MODE_NORMAL
|
140 OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT
|
141 U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT
|
142 (fb
->MaxNumLayers
> 0 ? 0 : GEN6_CLIP_FORCE_ZERO_RTAINDEX
) |
143 ((ctx
->Const
.MaxViewports
- 1) & GEN6_CLIP_MAX_VP_INDEX_MASK
));
147 const struct brw_tracked_state gen6_clip_state
= {
149 .mesa
= _NEW_TRANSFORM
| _NEW_LIGHT
| _NEW_BUFFERS
,
150 .brw
= BRW_NEW_CONTEXT
|
151 BRW_NEW_META_IN_PROGRESS
|
152 BRW_NEW_RASTERIZER_DISCARD
,
153 .cache
= CACHE_NEW_WM_PROG
155 .emit
= upload_clip_state
,
158 const struct brw_tracked_state gen7_clip_state
= {
160 .mesa
= _NEW_BUFFERS
| _NEW_LIGHT
| _NEW_POLYGON
| _NEW_TRANSFORM
,
161 .brw
= BRW_NEW_CONTEXT
|
162 BRW_NEW_META_IN_PROGRESS
|
163 BRW_NEW_RASTERIZER_DISCARD
,
164 .cache
= CACHE_NEW_WM_PROG
166 .emit
= upload_clip_state
,