src/amd/llvm/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, LLVMValueRef pos[3][4],
  52                               LLVMValueRef initially_accepted, LLVMValueRef vp_scale[2],
  53                               LLVMValueRef vp_translate[2], LLVMValueRef small_prim_precision,
  54                               struct ac_cull_options *options);
  55
  56 #endif