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 31struct 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 uint8_t num_vertices; /* 1..3 */ 51}; 52 53/* Callback invoked in the inner-most branch where the primitive is accepted. */ 54typedef void (*ac_cull_accept_func)(struct ac_llvm_context *ctx, LLVMValueRef accepted, 55 void *userdata); 56 57void ac_cull_primitive(struct ac_llvm_context *ctx, LLVMValueRef pos[3][4], 58 LLVMValueRef initially_accepted, LLVMValueRef vp_scale[2], 59 LLVMValueRef vp_translate[2], LLVMValueRef small_prim_precision, 60 LLVMValueRef clip_half_line_width[2], struct ac_cull_options *options, 61 ac_cull_accept_func accept_func, void *userdata); 62 63#endif 64