forked from bartvdbraak/blender
7f4479da42
This commit contains all the work related on the AMD megakernel split work which was mainly done by Varun Sundar, George Kyriazis and Lenny Wang, plus some help from Sergey Sharybin, Martijn Berger, Thomas Dinges and likely someone else which we're forgetting to mention. Currently only AMD cards are enabled for the new split kernel, but it is possible to force split opencl kernel to be used by setting the following environment variable: CYCLES_OPENCL_SPLIT_KERNEL_TEST=1. Not all the features are supported yet, and that being said no motion blur, camera blur, SSS and volumetrics for now. Also transparent shadows are disabled on AMD device because of some compiler bug. This kernel is also only implements regular path tracing and supporting branched one will take a bit. Branched path tracing is exposed to the interface still, which is a bit misleading and will be hidden there soon. More feature will be enabled once they're ported to the split kernel and tested. Neither regular CPU nor CUDA has any difference, they're generating the same exact code, which means no regressions/improvements there. Based on the research paper: https://research.nvidia.com/sites/default/files/publications/laine2013hpg_paper.pdf Here's the documentation: https://docs.google.com/document/d/1LuXW-CV-sVJkQaEGZlMJ86jZ8FmoPfecaMdR-oiWbUY/edit Design discussion of the patch: https://developer.blender.org/T44197 Differential Revision: https://developer.blender.org/D1200
235 lines
7.3 KiB
C
235 lines
7.3 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Primitive Utilities
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*
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* Generic functions to look up mesh, curve and volume primitive attributes for
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* shading and render passes. */
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CCL_NAMESPACE_BEGIN
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/* Generic primitive attribute reading functions */
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ccl_device float primitive_attribute_float(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float *dx, float *dy)
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{
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if(ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE) {
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return triangle_attribute_float(kg, sd, elem, offset, dx, dy);
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}
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#ifdef __HAIR__
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else if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) {
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return curve_attribute_float(kg, sd, elem, offset, dx, dy);
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}
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#endif
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#ifdef __VOLUME__
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else if(ccl_fetch(sd, object) != OBJECT_NONE && elem == ATTR_ELEMENT_VOXEL) {
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return volume_attribute_float(kg, sd, elem, offset, dx, dy);
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}
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#endif
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else {
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if(dx) *dx = 0.0f;
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if(dy) *dy = 0.0f;
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return 0.0f;
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}
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}
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ccl_device float3 primitive_attribute_float3(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float3 *dx, float3 *dy)
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{
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if(ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE) {
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return triangle_attribute_float3(kg, sd, elem, offset, dx, dy);
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}
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#ifdef __HAIR__
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else if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) {
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return curve_attribute_float3(kg, sd, elem, offset, dx, dy);
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}
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#endif
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#ifdef __VOLUME__
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else if(ccl_fetch(sd, object) != OBJECT_NONE && elem == ATTR_ELEMENT_VOXEL) {
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return volume_attribute_float3(kg, sd, elem, offset, dx, dy);
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}
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#endif
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else {
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if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
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if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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}
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/* Default UV coordinate */
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ccl_device float3 primitive_uv(KernelGlobals *kg, ShaderData *sd)
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{
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AttributeElement elem_uv;
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int offset_uv = find_attribute(kg, sd, ATTR_STD_UV, &elem_uv);
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if(offset_uv == ATTR_STD_NOT_FOUND)
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return make_float3(0.0f, 0.0f, 0.0f);
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float3 uv = primitive_attribute_float3(kg, sd, elem_uv, offset_uv, NULL, NULL);
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uv.z = 1.0f;
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return uv;
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}
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/* Ptex coordinates */
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ccl_device bool primitive_ptex(KernelGlobals *kg, ShaderData *sd, float2 *uv, int *face_id)
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{
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/* storing ptex data as attributes is not memory efficient but simple for tests */
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AttributeElement elem_face_id, elem_uv;
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int offset_face_id = find_attribute(kg, sd, ATTR_STD_PTEX_FACE_ID, &elem_face_id);
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int offset_uv = find_attribute(kg, sd, ATTR_STD_PTEX_UV, &elem_uv);
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if(offset_face_id == ATTR_STD_NOT_FOUND || offset_uv == ATTR_STD_NOT_FOUND)
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return false;
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float3 uv3 = primitive_attribute_float3(kg, sd, elem_uv, offset_uv, NULL, NULL);
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float face_id_f = primitive_attribute_float(kg, sd, elem_face_id, offset_face_id, NULL, NULL);
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*uv = make_float2(uv3.x, uv3.y);
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*face_id = (int)face_id_f;
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return true;
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}
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/* Surface tangent */
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ccl_device float3 primitive_tangent(KernelGlobals *kg, ShaderData *sd)
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{
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#ifdef __HAIR__
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if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE)
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#ifdef __DPDU__
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return normalize(ccl_fetch(sd, dPdu));
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#else
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return make_float3(0.0f, 0.0f, 0.0f);
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#endif
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#endif
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/* try to create spherical tangent from generated coordinates */
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AttributeElement attr_elem;
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int attr_offset = find_attribute(kg, sd, ATTR_STD_GENERATED, &attr_elem);
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if(attr_offset != ATTR_STD_NOT_FOUND) {
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float3 data = primitive_attribute_float3(kg, sd, attr_elem, attr_offset, NULL, NULL);
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data = make_float3(-(data.y - 0.5f), (data.x - 0.5f), 0.0f);
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object_normal_transform(kg, sd, &data);
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return cross(ccl_fetch(sd, N), normalize(cross(data, ccl_fetch(sd, N))));
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}
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else {
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/* otherwise use surface derivatives */
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#ifdef __DPDU__
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return normalize(ccl_fetch(sd, dPdu));
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#else
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return make_float3(0.0f, 0.0f, 0.0f);
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#endif
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}
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}
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/* Motion vector for motion pass */
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ccl_device float4 primitive_motion_vector(KernelGlobals *kg, ShaderData *sd)
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{
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/* center position */
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float3 center;
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#ifdef __HAIR__
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bool is_curve_primitive = ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE;
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if(is_curve_primitive) {
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center = curve_motion_center_location(kg, sd);
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if(!(ccl_fetch(sd, flag) & SD_TRANSFORM_APPLIED))
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object_position_transform(kg, sd, ¢er);
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}
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else
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#endif
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center = ccl_fetch(sd, P);
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float3 motion_pre = center, motion_post = center;
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/* deformation motion */
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AttributeElement elem;
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int offset = find_attribute(kg, sd, ATTR_STD_MOTION_VERTEX_POSITION, &elem);
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if(offset != ATTR_STD_NOT_FOUND) {
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/* get motion info */
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int numverts, numkeys;
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object_motion_info(kg, ccl_fetch(sd, object), NULL, &numverts, &numkeys);
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/* lookup attributes */
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int offset_next = (ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE)? offset + numverts: offset + numkeys;
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motion_pre = primitive_attribute_float3(kg, sd, elem, offset, NULL, NULL);
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motion_post = primitive_attribute_float3(kg, sd, elem, offset_next, NULL, NULL);
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#ifdef __HAIR__
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if(is_curve_primitive && (ccl_fetch(sd, flag) & SD_OBJECT_HAS_VERTEX_MOTION) == 0) {
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object_position_transform(kg, sd, &motion_pre);
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object_position_transform(kg, sd, &motion_post);
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}
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#endif
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}
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/* object motion. note that depending on the mesh having motion vectors, this
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* transformation was set match the world/object space of motion_pre/post */
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Transform tfm;
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tfm = object_fetch_vector_transform(kg, ccl_fetch(sd, object), OBJECT_VECTOR_MOTION_PRE);
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motion_pre = transform_point(&tfm, motion_pre);
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tfm = object_fetch_vector_transform(kg, ccl_fetch(sd, object), OBJECT_VECTOR_MOTION_POST);
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motion_post = transform_point(&tfm, motion_post);
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float3 motion_center;
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/* camera motion, for perspective/orthographic motion.pre/post will be a
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* world-to-raster matrix, for panorama it's world-to-camera */
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if(kernel_data.cam.type != CAMERA_PANORAMA) {
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tfm = kernel_data.cam.worldtoraster;
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motion_center = transform_perspective(&tfm, center);
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tfm = kernel_data.cam.motion.pre;
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motion_pre = transform_perspective(&tfm, motion_pre);
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tfm = kernel_data.cam.motion.post;
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motion_post = transform_perspective(&tfm, motion_post);
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}
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else {
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tfm = kernel_data.cam.worldtocamera;
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motion_center = normalize(transform_point(&tfm, center));
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motion_center = float2_to_float3(direction_to_panorama(kg, motion_center));
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motion_center.x *= kernel_data.cam.width;
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motion_center.y *= kernel_data.cam.height;
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tfm = kernel_data.cam.motion.pre;
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motion_pre = normalize(transform_point(&tfm, motion_pre));
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motion_pre = float2_to_float3(direction_to_panorama(kg, motion_pre));
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motion_pre.x *= kernel_data.cam.width;
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motion_pre.y *= kernel_data.cam.height;
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tfm = kernel_data.cam.motion.post;
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motion_post = normalize(transform_point(&tfm, motion_post));
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motion_post = float2_to_float3(direction_to_panorama(kg, motion_post));
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motion_post.x *= kernel_data.cam.width;
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motion_post.y *= kernel_data.cam.height;
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}
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motion_pre = motion_pre - motion_center;
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motion_post = motion_center - motion_post;
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return make_float4(motion_pre.x, motion_pre.y, motion_post.x, motion_post.y);
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}
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CCL_NAMESPACE_END
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