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"
28 #include "intel_batchbuffer.h"
29 #include "main/fbobject.h"
32 upload_clip_state(struct brw_context
*brw
)
34 struct gl_context
*ctx
= &brw
->ctx
;
35 uint32_t dw1
= 0, dw2
= 0;
38 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
39 bool render_to_fbo
= _mesa_is_user_fbo(fb
);
41 /* BRW_NEW_META_IN_PROGRESS */
42 if (!brw
->meta_in_progress
)
43 dw1
|= GEN6_CLIP_STATISTICS_ENABLE
;
45 /* CACHE_NEW_WM_PROG */
46 if (brw
->wm
.prog_data
->barycentric_interp_modes
&
47 BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS
) {
48 dw2
|= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE
;
51 dw1
|= GEN7_CLIP_EARLY_CULL
;
54 if ((ctx
->Polygon
.FrontFace
== GL_CCW
) ^ render_to_fbo
)
55 dw1
|= GEN7_CLIP_WINDING_CCW
;
57 if (ctx
->Polygon
.CullFlag
) {
58 switch (ctx
->Polygon
.CullFaceMode
) {
60 dw1
|= GEN7_CLIP_CULLMODE_FRONT
;
63 dw1
|= GEN7_CLIP_CULLMODE_BACK
;
65 case GL_FRONT_AND_BACK
:
66 dw1
|= GEN7_CLIP_CULLMODE_BOTH
;
69 assert(!"Should not get here: invalid CullFlag");
73 dw1
|= GEN7_CLIP_CULLMODE_NONE
;
77 if (!ctx
->Transform
.DepthClamp
)
78 dw2
|= GEN6_CLIP_Z_TEST
;
81 if (ctx
->Light
.ProvokingVertex
== GL_FIRST_VERTEX_CONVENTION
) {
83 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT
) |
84 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT
) |
85 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT
);
88 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT
) |
89 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT
) |
90 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT
);
94 dw2
|= (ctx
->Transform
.ClipPlanesEnabled
<<
95 GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT
);
97 if (ctx
->Viewport
.X
== 0 &&
98 ctx
->Viewport
.Y
== 0 &&
99 ctx
->Viewport
.Width
== fb
->Width
&&
100 ctx
->Viewport
.Height
== fb
->Height
) {
101 dw2
|= GEN6_CLIP_GB_TEST
;
104 /* BRW_NEW_RASTERIZER_DISCARD */
105 if (ctx
->RasterDiscard
) {
106 dw2
|= GEN6_CLIP_MODE_REJECT_ALL
;
107 perf_debug("Rasterizer discard is currently implemented via the clipper; "
108 "using the SOL unit may be faster.");
112 OUT_BATCH(_3DSTATE_CLIP
<< 16 | (4 - 2));
114 OUT_BATCH(GEN6_CLIP_ENABLE
|
116 GEN6_CLIP_MODE_NORMAL
|
119 OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT
|
120 U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT
|
121 GEN6_CLIP_FORCE_ZERO_RTAINDEX
);
125 const struct brw_tracked_state gen7_clip_state
= {
127 .mesa
= (_NEW_BUFFERS
|
131 .brw
= BRW_NEW_CONTEXT
|
132 BRW_NEW_META_IN_PROGRESS
|
133 BRW_NEW_RASTERIZER_DISCARD
,
134 .cache
= CACHE_NEW_WM_PROG
136 .emit
= upload_clip_state
,