1 /*
2 * Copyright © 2011 Intel Corporation
3 *
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:
10 *
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
13 * Software.
14 *
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
21 * IN THE SOFTWARE.
22 */
23
24 #include "brw_context.h"
25 #include "brw_state.h"
26 #include "brw_defines.h"
27 #include "brw_util.h"
28 #include "intel_batchbuffer.h"
29 #include "main/fbobject.h"
30
31 static void
upload_clip_state(struct brw_context * brw)32 upload_clip_state(struct brw_context *brw)
33 {
34 struct intel_context *intel = &brw->intel;
35 struct gl_context *ctx = &intel->ctx;
36 uint32_t depth_clamp = 0;
37 uint32_t provoking, userclip;
38 uint32_t dw1 = GEN6_CLIP_STATISTICS_ENABLE;
39 uint32_t nonperspective_barycentric_enable_flag = 0;
40
41 /* _NEW_BUFFERS */
42 bool render_to_fbo = _mesa_is_user_fbo(brw->intel.ctx.DrawBuffer);
43
44 /* CACHE_NEW_WM_PROG */
45 if (brw->wm.prog_data->barycentric_interp_modes &
46 BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) {
47 nonperspective_barycentric_enable_flag =
48 GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
49 }
50
51 dw1 |= GEN7_CLIP_EARLY_CULL;
52
53 /* _NEW_POLYGON */
54 if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
55 dw1 |= GEN7_CLIP_WINDING_CCW;
56
57 if (ctx->Polygon.CullFlag) {
58 switch (ctx->Polygon.CullFaceMode) {
59 case GL_FRONT:
60 dw1 |= GEN7_CLIP_CULLMODE_FRONT;
61 break;
62 case GL_BACK:
63 dw1 |= GEN7_CLIP_CULLMODE_BACK;
64 break;
65 case GL_FRONT_AND_BACK:
66 dw1 |= GEN7_CLIP_CULLMODE_BOTH;
67 break;
68 default:
69 assert(!"Should not get here: invalid CullFlag");
70 break;
71 }
72 } else {
73 dw1 |= GEN7_CLIP_CULLMODE_NONE;
74 }
75
76 /* _NEW_TRANSFORM */
77 if (!ctx->Transform.DepthClamp)
78 depth_clamp = GEN6_CLIP_Z_TEST;
79
80 /* _NEW_LIGHT */
81 if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
82 provoking =
83 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
84 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
85 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
86 } else {
87 provoking =
88 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
89 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
90 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
91 }
92
93 /* _NEW_TRANSFORM */
94 userclip = ctx->Transform.ClipPlanesEnabled;
95
96 BEGIN_BATCH(4);
97 OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
98 OUT_BATCH(dw1);
99 OUT_BATCH(GEN6_CLIP_ENABLE |
100 GEN6_CLIP_API_OGL |
101 GEN6_CLIP_MODE_NORMAL |
102 nonperspective_barycentric_enable_flag |
103 GEN6_CLIP_XY_TEST |
104 userclip << GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT |
105 depth_clamp |
106 provoking);
107 OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
108 U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
109 GEN6_CLIP_FORCE_ZERO_RTAINDEX);
110 ADVANCE_BATCH();
111 }
112
113 const struct brw_tracked_state gen7_clip_state = {
114 .dirty = {
115 .mesa = (_NEW_BUFFERS |
116 _NEW_POLYGON |
117 _NEW_LIGHT |
118 _NEW_TRANSFORM),
119 .brw = BRW_NEW_CONTEXT,
120 .cache = CACHE_NEW_WM_PROG
121 },
122 .emit = upload_clip_state,
123 };
124