forked from bartvdbraak/blender
235 lines
7.1 KiB
C
235 lines
7.1 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(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(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(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(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(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(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(sd->type & PRIMITIVE_ALL_CURVE)
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#ifdef __DPDU__
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return normalize(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(sd->N, normalize(cross(data, 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(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 = 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(!(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 = 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, sd->object, NULL, &numverts, &numkeys);
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/* lookup attributes */
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int offset_next = (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 && (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, 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, 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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