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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* Primitive Utilities
*
* Generic functions to look up mesh, curve and volume primitive attributes for
* shading and render passes. */
CCL_NAMESPACE_BEGIN
/* Generic primitive attribute reading functions */
ccl_device_inline float primitive_attribute_float(KernelGlobals *kg,
const ShaderData *sd,
const AttributeDescriptor desc,
float *dx, float *dy)
{
if(ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE) {
if(subd_triangle_patch(kg, sd) == ~0)
return triangle_attribute_float(kg, sd, desc, dx, dy);
else
return subd_triangle_attribute_float(kg, sd, desc, dx, dy);
}
#ifdef __HAIR__
else if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) {
return curve_attribute_float(kg, sd, desc, dx, dy);
}
#endif
#ifdef __VOLUME__
else if(ccl_fetch(sd, object) != OBJECT_NONE && desc.element == ATTR_ELEMENT_VOXEL) {
return volume_attribute_float(kg, sd, desc, dx, dy);
}
#endif
else {
if(dx) *dx = 0.0f;
if(dy) *dy = 0.0f;
return 0.0f;
}
}
ccl_device_inline float3 primitive_attribute_float3(KernelGlobals *kg,
const ShaderData *sd,
const AttributeDescriptor desc,
float3 *dx, float3 *dy)
{
if(ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE) {
if(subd_triangle_patch(kg, sd) == ~0)
return triangle_attribute_float3(kg, sd, desc, dx, dy);
else
return subd_triangle_attribute_float3(kg, sd, desc, dx, dy);
}
#ifdef __HAIR__
else if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE) {
return curve_attribute_float3(kg, sd, desc, dx, dy);
}
#endif
#ifdef __VOLUME__
else if(ccl_fetch(sd, object) != OBJECT_NONE && desc.element == ATTR_ELEMENT_VOXEL) {
return volume_attribute_float3(kg, sd, desc, dx, dy);
}
#endif
else {
if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
return make_float3(0.0f, 0.0f, 0.0f);
}
}
/* Default UV coordinate */
ccl_device_inline float3 primitive_uv(KernelGlobals *kg, ShaderData *sd)
{
const AttributeDescriptor desc = find_attribute(kg, sd, ATTR_STD_UV);
if(desc.offset == ATTR_STD_NOT_FOUND)
return make_float3(0.0f, 0.0f, 0.0f);
float3 uv = primitive_attribute_float3(kg, sd, desc, NULL, NULL);
uv.z = 1.0f;
return uv;
}
/* Ptex coordinates */
ccl_device bool primitive_ptex(KernelGlobals *kg, ShaderData *sd, float2 *uv, int *face_id)
{
/* storing ptex data as attributes is not memory efficient but simple for tests */
const AttributeDescriptor desc_face_id = find_attribute(kg, sd, ATTR_STD_PTEX_FACE_ID);
const AttributeDescriptor desc_uv = find_attribute(kg, sd, ATTR_STD_PTEX_UV);
if(desc_face_id.offset == ATTR_STD_NOT_FOUND || desc_uv.offset == ATTR_STD_NOT_FOUND)
return false;
float3 uv3 = primitive_attribute_float3(kg, sd, desc_uv, NULL, NULL);
float face_id_f = primitive_attribute_float(kg, sd, desc_face_id, NULL, NULL);
*uv = make_float2(uv3.x, uv3.y);
*face_id = (int)face_id_f;
return true;
}
/* Surface tangent */
ccl_device float3 primitive_tangent(KernelGlobals *kg, ShaderData *sd)
{
#ifdef __HAIR__
if(ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE)
# ifdef __DPDU__
return normalize(ccl_fetch(sd, dPdu));
# else
return make_float3(0.0f, 0.0f, 0.0f);
# endif
#endif
/* try to create spherical tangent from generated coordinates */
const AttributeDescriptor desc = find_attribute(kg, sd, ATTR_STD_GENERATED);
if(desc.offset != ATTR_STD_NOT_FOUND) {
float3 data = primitive_attribute_float3(kg, sd, desc, NULL, NULL);
data = make_float3(-(data.y - 0.5f), (data.x - 0.5f), 0.0f);
object_normal_transform(kg, sd, &data);
return cross(ccl_fetch(sd, N), normalize(cross(data, ccl_fetch(sd, N))));
}
else {
/* otherwise use surface derivatives */
#ifdef __DPDU__
return normalize(ccl_fetch(sd, dPdu));
#else
return make_float3(0.0f, 0.0f, 0.0f);
#endif
}
}
/* Motion vector for motion pass */
ccl_device_inline float4 primitive_motion_vector(KernelGlobals *kg, ShaderData *sd)
{
/* center position */
float3 center;
#ifdef __HAIR__
bool is_curve_primitive = ccl_fetch(sd, type) & PRIMITIVE_ALL_CURVE;
if(is_curve_primitive) {
center = curve_motion_center_location(kg, sd);
if(!(ccl_fetch(sd, flag) & SD_OBJECT_TRANSFORM_APPLIED))
object_position_transform(kg, sd, ¢er);
}
else
#endif
center = ccl_fetch(sd, P);
float3 motion_pre = center, motion_post = center;
/* deformation motion */
AttributeDescriptor desc = find_attribute(kg, sd, ATTR_STD_MOTION_VERTEX_POSITION);
if(desc.offset != ATTR_STD_NOT_FOUND) {
/* get motion info */
int numverts, numkeys;
object_motion_info(kg, ccl_fetch(sd, object), NULL, &numverts, &numkeys);
/* lookup attributes */
motion_pre = primitive_attribute_float3(kg, sd, desc, NULL, NULL);
desc.offset += (ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE)? numverts: numkeys;
motion_post = primitive_attribute_float3(kg, sd, desc, NULL, NULL);
#ifdef __HAIR__
if(is_curve_primitive && (ccl_fetch(sd, flag) & SD_OBJECT_HAS_VERTEX_MOTION) == 0) {
object_position_transform(kg, sd, &motion_pre);
object_position_transform(kg, sd, &motion_post);
}
#endif
}
/* object motion. note that depending on the mesh having motion vectors, this
* transformation was set match the world/object space of motion_pre/post */
Transform tfm;
tfm = object_fetch_vector_transform(kg, ccl_fetch(sd, object), OBJECT_VECTOR_MOTION_PRE);
motion_pre = transform_point(&tfm, motion_pre);
tfm = object_fetch_vector_transform(kg, ccl_fetch(sd, object), OBJECT_VECTOR_MOTION_POST);
motion_post = transform_point(&tfm, motion_post);
float3 motion_center;
/* camera motion, for perspective/orthographic motion.pre/post will be a
* world-to-raster matrix, for panorama it's world-to-camera */
if(kernel_data.cam.type != CAMERA_PANORAMA) {
tfm = kernel_data.cam.worldtoraster;
motion_center = transform_perspective(&tfm, center);
tfm = kernel_data.cam.motion.pre;
motion_pre = transform_perspective(&tfm, motion_pre);
tfm = kernel_data.cam.motion.post;
motion_post = transform_perspective(&tfm, motion_post);
}
else {
tfm = kernel_data.cam.worldtocamera;
motion_center = normalize(transform_point(&tfm, center));
motion_center = float2_to_float3(direction_to_panorama(kg, motion_center));
motion_center.x *= kernel_data.cam.width;
motion_center.y *= kernel_data.cam.height;
tfm = kernel_data.cam.motion.pre;
motion_pre = normalize(transform_point(&tfm, motion_pre));
motion_pre = float2_to_float3(direction_to_panorama(kg, motion_pre));
motion_pre.x *= kernel_data.cam.width;
motion_pre.y *= kernel_data.cam.height;
tfm = kernel_data.cam.motion.post;
motion_post = normalize(transform_point(&tfm, motion_post));
motion_post = float2_to_float3(direction_to_panorama(kg, motion_post));
motion_post.x *= kernel_data.cam.width;
motion_post.y *= kernel_data.cam.height;
}
motion_pre = motion_pre - motion_center;
motion_post = motion_center - motion_post;
return make_float4(motion_pre.x, motion_pre.y, motion_post.x, motion_post.y);
}
CCL_NAMESPACE_END
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