gen7_clip_state.c revision f2b4f588f5a5b656843b720f59b8cd6ce573ac93 
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
31static void
32upload_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
113const 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