src/amd/llvm/ac_llvm_cull.c - platform/external/mesa3d - Git at Google

 /*
  * 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.
  *
  */

 #include "ac_llvm_cull.h"
 #include <llvm-c/Core.h>

 struct ac_position_w_info {
 	/* If a primitive intersects the W=0 plane, it causes a reflection
 	 * of the determinant used for face culling. Every vertex behind
 	 * the W=0 plane negates the determinant, so having 2 vertices behind
 	 * the plane has no effect. This is i1 true if the determinant should be
 	 * negated.
 	 */
 	LLVMValueRef w_reflection;

 	/* If we simplify the "-w <= p <= w" view culling equation, we get
 	 * "-w <= w", which can't be satisfied when w is negative.
 	 * In perspective projection, a negative W means that the primitive
 	 * is behind the viewer, but the equation is independent of the type
 	 * of projection.
 	 *
 	 * w_accepted is false when all W are negative and therefore
 	 * the primitive is invisible.
 	 */
 	LLVMValueRef w_accepted;

 	LLVMValueRef all_w_positive;
 	LLVMValueRef any_w_negative;
 };

 static void ac_analyze_position_w(struct ac_llvm_context *ctx,
 				  LLVMValueRef pos[3][4],
 				  struct ac_position_w_info *w)
 {
 	LLVMBuilderRef builder = ctx->builder;
 	LLVMValueRef all_w_negative = ctx->i1true;

 	w->w_reflection = ctx->i1false;
 	w->any_w_negative = ctx->i1false;

 	for (unsigned i = 0; i < 3; i++) {
 		LLVMValueRef neg_w;

 		neg_w = LLVMBuildFCmp(builder, LLVMRealOLT, pos[i][3], ctx->f32_0, "");
 		/* If neg_w is true, negate w_reflection. */
 		w->w_reflection = LLVMBuildXor(builder, w->w_reflection, neg_w, "");
 		w->any_w_negative = LLVMBuildOr(builder, w->any_w_negative, neg_w, "");
 		all_w_negative = LLVMBuildAnd(builder, all_w_negative, neg_w, "");
 	}
 	w->all_w_positive = LLVMBuildNot(builder, w->any_w_negative, "");
 	w->w_accepted = LLVMBuildNot(builder, all_w_negative, "");
 }

 /* Perform front/back face culling and return true if the primitive is accepted. */
 static LLVMValueRef ac_cull_face(struct ac_llvm_context *ctx,
 				 LLVMValueRef pos[3][4],
 				 struct ac_position_w_info *w,
 				 bool cull_front,
 				 bool cull_back,
 				 bool cull_zero_area)
 {
 	LLVMBuilderRef builder = ctx->builder;

 	if (cull_front && cull_back)
 		return ctx->i1false;

 	if (!cull_front && !cull_back && !cull_zero_area)
 		return ctx->i1true;

 	/* Front/back face culling. Also if the determinant == 0, the triangle
 	 * area is 0.
 	 */
 	LLVMValueRef det_t0 = LLVMBuildFSub(builder, pos[2][0], pos[0][0], "");
 	LLVMValueRef det_t1 = LLVMBuildFSub(builder, pos[1][1], pos[0][1], "");
 	LLVMValueRef det_t2 = LLVMBuildFSub(builder, pos[0][0], pos[1][0], "");
 	LLVMValueRef det_t3 = LLVMBuildFSub(builder, pos[0][1], pos[2][1], "");
 	LLVMValueRef det_p0 = LLVMBuildFMul(builder, det_t0, det_t1, "");
 	LLVMValueRef det_p1 = LLVMBuildFMul(builder, det_t2, det_t3, "");
 	LLVMValueRef det = LLVMBuildFSub(builder, det_p0, det_p1, "");

 	/* Negative W negates the determinant. */
 	det = LLVMBuildSelect(builder, w->w_reflection,
 			      LLVMBuildFNeg(builder, det, ""),
 			      det, "");

 	LLVMValueRef accepted = NULL;
 	if (cull_front) {
 		LLVMRealPredicate cond = cull_zero_area ? LLVMRealOGT : LLVMRealOGE;
 		accepted = LLVMBuildFCmp(builder, cond, det, ctx->f32_0, "");
 	} else if (cull_back) {
 		LLVMRealPredicate cond = cull_zero_area ? LLVMRealOLT : LLVMRealOLE;
 		accepted = LLVMBuildFCmp(builder, cond, det, ctx->f32_0, "");
 	} else if (cull_zero_area) {
 		accepted = LLVMBuildFCmp(builder, LLVMRealONE, det, ctx->f32_0, "");
 	}
 	return accepted;
 }

 /* Perform view culling and small primitive elimination and return true
  * if the primitive is accepted and initially_accepted == true. */
 static LLVMValueRef cull_bbox(struct ac_llvm_context *ctx,
 			      LLVMValueRef pos[3][4],
 			      LLVMValueRef initially_accepted,
 			      struct ac_position_w_info *w,
 			      LLVMValueRef vp_scale[2],
 			      LLVMValueRef vp_translate[2],
 			      LLVMValueRef small_prim_precision,
 			      bool cull_view_xy,
 			      bool cull_view_near_z,
 			      bool cull_view_far_z,
 			      bool cull_small_prims,
 			      bool use_halfz_clip_space)
 {
 	LLVMBuilderRef builder = ctx->builder;

 	if (!cull_view_xy && !cull_view_near_z && !cull_view_far_z && !cull_small_prims)
 		return initially_accepted;

 	/* Skip the culling if the primitive has already been rejected or
 	 * if any W is negative. The bounding box culling doesn't work when
 	 * W is negative.
 	 */
 	LLVMValueRef cond = LLVMBuildAnd(builder, initially_accepted,
 					 w->all_w_positive, "");
 	LLVMValueRef accepted_var = ac_build_alloca_undef(ctx, ctx->i1, "");
 	LLVMBuildStore(builder, initially_accepted, accepted_var);

 	ac_build_ifcc(ctx, cond, 10000000 /* does this matter? */);
 	{
 		LLVMValueRef bbox_min[3], bbox_max[3];
 		LLVMValueRef accepted = initially_accepted;

 		/* Compute the primitive bounding box for easy culling. */
 		for (unsigned chan = 0; chan < (cull_view_near_z || cull_view_far_z ? 3 : 2); chan++) {
 			bbox_min[chan] = ac_build_fmin(ctx, pos[0][chan], pos[1][chan]);
 			bbox_min[chan] = ac_build_fmin(ctx, bbox_min[chan], pos[2][chan]);

 			bbox_max[chan] = ac_build_fmax(ctx, pos[0][chan], pos[1][chan]);
 			bbox_max[chan] = ac_build_fmax(ctx, bbox_max[chan], pos[2][chan]);
 		}

 		/* View culling. */
 		if (cull_view_xy || cull_view_near_z || cull_view_far_z) {
 			for (unsigned chan = 0; chan < 3; chan++) {
 				LLVMValueRef visible;

 				if ((cull_view_xy && chan <= 1) ||
 				    (cull_view_near_z && chan == 2)) {
 					float t = chan == 2 && use_halfz_clip_space ? 0 : -1;
 					visible = LLVMBuildFCmp(builder, LLVMRealOGE, bbox_max[chan],
 								LLVMConstReal(ctx->f32, t), "");
 					accepted = LLVMBuildAnd(builder, accepted, visible, "");
 				}

 				if ((cull_view_xy && chan <= 1) ||
 				    (cull_view_far_z && chan == 2)) {
 					visible = LLVMBuildFCmp(builder, LLVMRealOLE, bbox_min[chan],
 								ctx->f32_1, "");
 					accepted = LLVMBuildAnd(builder, accepted, visible, "");
 				}
 			}
 		}

 		/* Small primitive elimination. */
 		if (cull_small_prims) {
 			/* Assuming a sample position at (0.5, 0.5), if we round
 			 * the bounding box min/max extents and the results of
 			 * the rounding are equal in either the X or Y direction,
 			 * the bounding box does not intersect the sample.
 			 *
 			 * See these GDC slides for pictures:
 			 * https://frostbite-wp-prd.s3.amazonaws.com/wp-content/uploads/2016/03/29204330/GDC_2016_Compute.pdf
 			 */
 			LLVMValueRef min, max, not_equal[2], visible;

 			for (unsigned chan = 0; chan < 2; chan++) {
 				/* Convert the position to screen-space coordinates. */
 				min = ac_build_fmad(ctx, bbox_min[chan],
 						    vp_scale[chan], vp_translate[chan]);
 				max = ac_build_fmad(ctx, bbox_max[chan],
 						    vp_scale[chan], vp_translate[chan]);
 				/* Scale the bounding box according to the precision of
 				 * the rasterizer and the number of MSAA samples. */
 				min = LLVMBuildFSub(builder, min, small_prim_precision, "");
 				max = LLVMBuildFAdd(builder, max, small_prim_precision, "");

 				/* Determine if the bbox intersects the sample point.
 				 * It also works for MSAA, but vp_scale, vp_translate,
 				 * and small_prim_precision are computed differently.
 				 */
 				min = ac_build_round(ctx, min);
 				max = ac_build_round(ctx, max);
 				not_equal[chan] = LLVMBuildFCmp(builder, LLVMRealONE, min, max, "");
 			}
 			visible = LLVMBuildAnd(builder, not_equal[0], not_equal[1], "");
 			accepted = LLVMBuildAnd(builder, accepted, visible, "");
 		}

 		LLVMBuildStore(builder, accepted, accepted_var);
 	}
 	ac_build_endif(ctx, 10000000);

 	return LLVMBuildLoad(builder, accepted_var, "");
 }

 /**
  * Return i1 true if the primitive is accepted (not culled).
  *
  * \param pos                   Vertex positions 3x vec4
  * \param initially_accepted    AND'ed with the result. Some computations can be
  *                              skipped if this is false.
  * \param vp_scale              Viewport scale XY.
  *                              For MSAA, multiply them by the number of samples.
  * \param vp_translate          Viewport translation XY.
  *                              For MSAA, multiply them by the number of samples.
  * \param small_prim_precision  Precision of small primitive culling. This should
  *                              be the same as or greater than the precision of
  *                              the rasterizer. Set to num_samples / 2^subpixel_bits.
  *                              subpixel_bits are defined by the quantization mode.
  * \param options               See ac_cull_options.
  */
 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)
 {
 	struct ac_position_w_info w;
 	ac_analyze_position_w(ctx, pos, &w);

 	/* W culling. */
 	LLVMValueRef accepted = options->cull_w ? w.w_accepted : ctx->i1true;
 	accepted = LLVMBuildAnd(ctx->builder, accepted, initially_accepted, "");

 	/* Face culling. */
 	accepted = LLVMBuildAnd(ctx->builder, accepted,
 				ac_cull_face(ctx, pos, &w,
 					     options->cull_front,
 					     options->cull_back,
 					     options->cull_zero_area), "");

 	/* View culling and small primitive elimination. */
 	accepted = cull_bbox(ctx, pos, accepted, &w, vp_scale, vp_translate,
 			     small_prim_precision,
 			     options->cull_view_xy,
 			     options->cull_view_near_z,
 			     options->cull_view_far_z,
 			     options->cull_small_prims,
 			     options->use_halfz_clip_space);
 	return accepted;
 }
	/*
	* 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.
	*
	*/

	#include "ac_llvm_cull.h"
	#include <llvm-c/Core.h>

	struct ac_position_w_info {
	/* If a primitive intersects the W=0 plane, it causes a reflection
	* of the determinant used for face culling. Every vertex behind
	* the W=0 plane negates the determinant, so having 2 vertices behind
	* the plane has no effect. This is i1 true if the determinant should be
	* negated.
	*/
	LLVMValueRef w_reflection;

	/* If we simplify the "-w <= p <= w" view culling equation, we get
	* "-w <= w", which can't be satisfied when w is negative.
	* In perspective projection, a negative W means that the primitive
	* is behind the viewer, but the equation is independent of the type
	* of projection.
	*
	* w_accepted is false when all W are negative and therefore
	* the primitive is invisible.
	*/
	LLVMValueRef w_accepted;

	LLVMValueRef all_w_positive;
	LLVMValueRef any_w_negative;
	};

	static void ac_analyze_position_w(struct ac_llvm_context *ctx,
	LLVMValueRef pos[3][4],
	struct ac_position_w_info *w)
	{
	LLVMBuilderRef builder = ctx->builder;
	LLVMValueRef all_w_negative = ctx->i1true;

	w->w_reflection = ctx->i1false;
	w->any_w_negative = ctx->i1false;

	for (unsigned i = 0; i < 3; i++) {
	LLVMValueRef neg_w;

	neg_w = LLVMBuildFCmp(builder, LLVMRealOLT, pos[i][3], ctx->f32_0, "");
	/* If neg_w is true, negate w_reflection. */
	w->w_reflection = LLVMBuildXor(builder, w->w_reflection, neg_w, "");
	w->any_w_negative = LLVMBuildOr(builder, w->any_w_negative, neg_w, "");
	all_w_negative = LLVMBuildAnd(builder, all_w_negative, neg_w, "");
	}
	w->all_w_positive = LLVMBuildNot(builder, w->any_w_negative, "");
	w->w_accepted = LLVMBuildNot(builder, all_w_negative, "");
	}

	/* Perform front/back face culling and return true if the primitive is accepted. */
	static LLVMValueRef ac_cull_face(struct ac_llvm_context *ctx,
	LLVMValueRef pos[3][4],
	struct ac_position_w_info *w,
	bool cull_front,
	bool cull_back,
	bool cull_zero_area)
	{
	LLVMBuilderRef builder = ctx->builder;

	if (cull_front && cull_back)
	return ctx->i1false;

	if (!cull_front && !cull_back && !cull_zero_area)
	return ctx->i1true;

	/* Front/back face culling. Also if the determinant == 0, the triangle
	* area is 0.
	*/
	LLVMValueRef det_t0 = LLVMBuildFSub(builder, pos[2][0], pos[0][0], "");
	LLVMValueRef det_t1 = LLVMBuildFSub(builder, pos[1][1], pos[0][1], "");
	LLVMValueRef det_t2 = LLVMBuildFSub(builder, pos[0][0], pos[1][0], "");
	LLVMValueRef det_t3 = LLVMBuildFSub(builder, pos[0][1], pos[2][1], "");
	LLVMValueRef det_p0 = LLVMBuildFMul(builder, det_t0, det_t1, "");
	LLVMValueRef det_p1 = LLVMBuildFMul(builder, det_t2, det_t3, "");
	LLVMValueRef det = LLVMBuildFSub(builder, det_p0, det_p1, "");

	/* Negative W negates the determinant. */
	det = LLVMBuildSelect(builder, w->w_reflection,
	LLVMBuildFNeg(builder, det, ""),
	det, "");

	LLVMValueRef accepted = NULL;
	if (cull_front) {
	LLVMRealPredicate cond = cull_zero_area ? LLVMRealOGT : LLVMRealOGE;
	accepted = LLVMBuildFCmp(builder, cond, det, ctx->f32_0, "");
	} else if (cull_back) {
	LLVMRealPredicate cond = cull_zero_area ? LLVMRealOLT : LLVMRealOLE;
	accepted = LLVMBuildFCmp(builder, cond, det, ctx->f32_0, "");
	} else if (cull_zero_area) {
	accepted = LLVMBuildFCmp(builder, LLVMRealONE, det, ctx->f32_0, "");
	}
	return accepted;
	}

	/* Perform view culling and small primitive elimination and return true
	* if the primitive is accepted and initially_accepted == true. */
	static LLVMValueRef cull_bbox(struct ac_llvm_context *ctx,
	LLVMValueRef pos[3][4],
	LLVMValueRef initially_accepted,
	struct ac_position_w_info *w,
	LLVMValueRef vp_scale[2],
	LLVMValueRef vp_translate[2],
	LLVMValueRef small_prim_precision,
	bool cull_view_xy,
	bool cull_view_near_z,
	bool cull_view_far_z,
	bool cull_small_prims,
	bool use_halfz_clip_space)
	{
	LLVMBuilderRef builder = ctx->builder;

	if (!cull_view_xy && !cull_view_near_z && !cull_view_far_z && !cull_small_prims)
	return initially_accepted;

	/* Skip the culling if the primitive has already been rejected or
	* if any W is negative. The bounding box culling doesn't work when
	* W is negative.
	*/
	LLVMValueRef cond = LLVMBuildAnd(builder, initially_accepted,
	w->all_w_positive, "");
	LLVMValueRef accepted_var = ac_build_alloca_undef(ctx, ctx->i1, "");
	LLVMBuildStore(builder, initially_accepted, accepted_var);

	ac_build_ifcc(ctx, cond, 10000000 /* does this matter? */);
	{
	LLVMValueRef bbox_min[3], bbox_max[3];
	LLVMValueRef accepted = initially_accepted;

	/* Compute the primitive bounding box for easy culling. */
	for (unsigned chan = 0; chan < (cull_view_near_z \|\| cull_view_far_z ? 3 : 2); chan++) {
	bbox_min[chan] = ac_build_fmin(ctx, pos[0][chan], pos[1][chan]);
	bbox_min[chan] = ac_build_fmin(ctx, bbox_min[chan], pos[2][chan]);

	bbox_max[chan] = ac_build_fmax(ctx, pos[0][chan], pos[1][chan]);
	bbox_max[chan] = ac_build_fmax(ctx, bbox_max[chan], pos[2][chan]);
	}

	/* View culling. */
	if (cull_view_xy \|\| cull_view_near_z \|\| cull_view_far_z) {
	for (unsigned chan = 0; chan < 3; chan++) {
	LLVMValueRef visible;

	if ((cull_view_xy && chan <= 1) \|\|
	(cull_view_near_z && chan == 2)) {
	float t = chan == 2 && use_halfz_clip_space ? 0 : -1;
	visible = LLVMBuildFCmp(builder, LLVMRealOGE, bbox_max[chan],
	LLVMConstReal(ctx->f32, t), "");
	accepted = LLVMBuildAnd(builder, accepted, visible, "");
	}

	if ((cull_view_xy && chan <= 1) \|\|
	(cull_view_far_z && chan == 2)) {
	visible = LLVMBuildFCmp(builder, LLVMRealOLE, bbox_min[chan],
	ctx->f32_1, "");
	accepted = LLVMBuildAnd(builder, accepted, visible, "");
	}
	}
	}

	/* Small primitive elimination. */
	if (cull_small_prims) {
	/* Assuming a sample position at (0.5, 0.5), if we round
	* the bounding box min/max extents and the results of
	* the rounding are equal in either the X or Y direction,
	* the bounding box does not intersect the sample.
	*
	* See these GDC slides for pictures:
	* https://frostbite-wp-prd.s3.amazonaws.com/wp-content/uploads/2016/03/29204330/GDC_2016_Compute.pdf
	*/
	LLVMValueRef min, max, not_equal[2], visible;

	for (unsigned chan = 0; chan < 2; chan++) {
	/* Convert the position to screen-space coordinates. */
	min = ac_build_fmad(ctx, bbox_min[chan],
	vp_scale[chan], vp_translate[chan]);
	max = ac_build_fmad(ctx, bbox_max[chan],
	vp_scale[chan], vp_translate[chan]);
	/* Scale the bounding box according to the precision of
	* the rasterizer and the number of MSAA samples. */
	min = LLVMBuildFSub(builder, min, small_prim_precision, "");
	max = LLVMBuildFAdd(builder, max, small_prim_precision, "");

	/* Determine if the bbox intersects the sample point.
	* It also works for MSAA, but vp_scale, vp_translate,
	* and small_prim_precision are computed differently.
	*/
	min = ac_build_round(ctx, min);
	max = ac_build_round(ctx, max);
	not_equal[chan] = LLVMBuildFCmp(builder, LLVMRealONE, min, max, "");
	}
	visible = LLVMBuildAnd(builder, not_equal[0], not_equal[1], "");
	accepted = LLVMBuildAnd(builder, accepted, visible, "");
	}

	LLVMBuildStore(builder, accepted, accepted_var);
	}
	ac_build_endif(ctx, 10000000);

	return LLVMBuildLoad(builder, accepted_var, "");
	}

	/**
	* Return i1 true if the primitive is accepted (not culled).
	*
	* \param pos Vertex positions 3x vec4
	* \param initially_accepted AND'ed with the result. Some computations can be
	* skipped if this is false.
	* \param vp_scale Viewport scale XY.
	* For MSAA, multiply them by the number of samples.
	* \param vp_translate Viewport translation XY.
	* For MSAA, multiply them by the number of samples.
	* \param small_prim_precision Precision of small primitive culling. This should
	* be the same as or greater than the precision of
	* the rasterizer. Set to num_samples / 2^subpixel_bits.
	* subpixel_bits are defined by the quantization mode.
	* \param options See ac_cull_options.
	*/
	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)
	{
	struct ac_position_w_info w;
	ac_analyze_position_w(ctx, pos, &w);

	/* W culling. */
	LLVMValueRef accepted = options->cull_w ? w.w_accepted : ctx->i1true;
	accepted = LLVMBuildAnd(ctx->builder, accepted, initially_accepted, "");

	/* Face culling. */
	accepted = LLVMBuildAnd(ctx->builder, accepted,
	ac_cull_face(ctx, pos, &w,
	options->cull_front,
	options->cull_back,
	options->cull_zero_area), "");

	/* View culling and small primitive elimination. */
	accepted = cull_bbox(ctx, pos, accepted, &w, vp_scale, vp_translate,
	small_prim_precision,
	options->cull_view_xy,
	options->cull_view_near_z,
	options->cull_view_far_z,
	options->cull_small_prims,
	options->use_halfz_clip_space);
	return accepted;
	}