aboutsummaryrefslogtreecommitdiffstats
path: root/src/mesa/drivers/dri/i965/gen7_clip_state.c
blob: 29a5ed571725d2d3b3e6a40f0141142f0a68efb5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * Copyright © 2011 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "brw_util.h"
#include "intel_batchbuffer.h"
#include "main/fbobject.h"

static void
upload_clip_state(struct brw_context *brw)
{
   struct intel_context *intel = &brw->intel;
   struct gl_context *ctx = &intel->ctx;
   uint32_t dw1 = GEN6_CLIP_STATISTICS_ENABLE, dw2 = 0;

   /* _NEW_BUFFERS */
   struct gl_framebuffer *fb = ctx->DrawBuffer;
   bool render_to_fbo = _mesa_is_user_fbo(fb);

   /* CACHE_NEW_WM_PROG */
   if (brw->wm.prog_data->barycentric_interp_modes &
       BRW_WM_NONPERSPECTIVE_BARYCENTRIC_BITS) {
      dw2 |= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
   }

   dw1 |= GEN7_CLIP_EARLY_CULL;

   /* _NEW_POLYGON */
   if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
      dw1 |= GEN7_CLIP_WINDING_CCW;

   if (ctx->Polygon.CullFlag) {
      switch (ctx->Polygon.CullFaceMode) {
      case GL_FRONT:
	 dw1 |= GEN7_CLIP_CULLMODE_FRONT;
	 break;
      case GL_BACK:
	 dw1 |= GEN7_CLIP_CULLMODE_BACK;
	 break;
      case GL_FRONT_AND_BACK:
	 dw1 |= GEN7_CLIP_CULLMODE_BOTH;
	 break;
      default:
	 assert(!"Should not get here: invalid CullFlag");
	 break;
      }
   } else {
      dw1 |= GEN7_CLIP_CULLMODE_NONE;
   }

   /* _NEW_TRANSFORM */
   if (!ctx->Transform.DepthClamp)
      dw2 |= GEN6_CLIP_Z_TEST;

   /* _NEW_LIGHT */
   if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
      dw2 |=
	 (0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
	 (1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
	 (0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
   } else {
      dw2 |=
	 (2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
	 (2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
	 (1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
   }

   /* _NEW_TRANSFORM */
   dw2 |= (ctx->Transform.ClipPlanesEnabled <<
           GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT);

   if (ctx->Viewport.X == 0 &&
       ctx->Viewport.Y == 0 &&
       ctx->Viewport.Width == fb->Width &&
       ctx->Viewport.Height == fb->Height) {
      dw2 |= GEN6_CLIP_GB_TEST;
   }

   BEGIN_BATCH(4);
   OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
   OUT_BATCH(dw1);
   OUT_BATCH(GEN6_CLIP_ENABLE |
	     GEN6_CLIP_API_OGL |
	     GEN6_CLIP_MODE_NORMAL |
	     GEN6_CLIP_XY_TEST |
             dw2);
   OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
             U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
             GEN6_CLIP_FORCE_ZERO_RTAINDEX);
   ADVANCE_BATCH();
}

const struct brw_tracked_state gen7_clip_state = {
   .dirty = {
      .mesa  = (_NEW_BUFFERS |
                _NEW_POLYGON |
                _NEW_LIGHT |
                _NEW_TRANSFORM),
      .brw   = BRW_NEW_CONTEXT,
      .cache = CACHE_NEW_WM_PROG
   },
   .emit = upload_clip_state,
};