ac: add LLVM code for triangle culling
[mesa.git] / src / amd / common / ac_llvm_cull.h
1 /*
2 * Copyright 2019 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25
26 #ifndef AC_LLVM_CULL_H
27 #define AC_LLVM_CULL_H
28
29 #include "ac_llvm_build.h"
30
31 struct ac_cull_options {
32 /* In general, I recommend setting all to true except view Z culling,
33 * which isn't so effective because W culling is cheaper and partially
34 * replaces near Z culling, and you don't need to set Position.z
35 * if Z culling is disabled.
36 *
37 * If something doesn't work, turn some of these off to find out what.
38 */
39 bool cull_front;
40 bool cull_back;
41 bool cull_view_xy;
42 bool cull_view_near_z;
43 bool cull_view_far_z;
44 bool cull_small_prims;
45 bool cull_zero_area;
46 bool cull_w; /* cull primitives with all W < 0 */
47
48 bool use_halfz_clip_space;
49 };
50
51 LLVMValueRef ac_cull_triangle(struct ac_llvm_context *ctx,
52 LLVMValueRef pos[3][4],
53 LLVMValueRef initially_accepted,
54 LLVMValueRef vp_scale[2],
55 LLVMValueRef vp_translate[2],
56 LLVMValueRef small_prim_precision,
57 struct ac_cull_options *options);
58
59 #endif