ac: add LLVM code for triangle culling

Tested-by: Dieter Nützel <[email protected]>
Acked-by: Nicolai Hähnle <[email protected]>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/amd/common/ac_llvm_cull.h b/src/amd/common/ac_llvm_cull.h
new file mode 100644
index 00000000000..0aa6c902a68
--- /dev/null
+++ b/src/amd/common/ac_llvm_cull.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ *
+ * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ */
+
+#ifndef AC_LLVM_CULL_H
+#define AC_LLVM_CULL_H
+
+#include "ac_llvm_build.h"
+
+struct ac_cull_options {
+	/* In general, I recommend setting all to true except view Z culling,
+	 * which isn't so effective because W culling is cheaper and partially
+	 * replaces near Z culling, and you don't need to set Position.z
+	 * if Z culling is disabled.
+	 *
+	 * If something doesn't work, turn some of these off to find out what.
+	 */
+	bool cull_front;
+	bool cull_back;
+	bool cull_view_xy;
+	bool cull_view_near_z;
+	bool cull_view_far_z;
+	bool cull_small_prims;
+	bool cull_zero_area;
+	bool cull_w; /* cull primitives with all W < 0 */
+
+	bool use_halfz_clip_space;
+};
+
+LLVMValueRef ac_cull_triangle(struct ac_llvm_context *ctx,
+			      LLVMValueRef pos[3][4],
+			      LLVMValueRef initially_accepted,
+			      LLVMValueRef vp_scale[2],
+			      LLVMValueRef vp_translate[2],
+			      LLVMValueRef small_prim_precision,
+			      struct ac_cull_options *options);
+
+#endif