svm_camera.h

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/*
 * Copyright 2011, Blender Foundation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

CCL_NAMESPACE_BEGIN

__device void svm_node_camera(KernelGlobals *kg, ShaderData *sd, float *stack, uint out_vector, uint out_zdepth, uint out_distance)
{
    float distance;
    float zdepth;
    float3 vector;

    Transform tfm = kernel_data.cam.worldtocamera;
    vector = transform(&tfm, sd->P);
    zdepth = vector.z;
    distance = len(vector);

    if (stack_valid(out_vector))
        stack_store_float3(stack, out_vector, normalize(vector));

    if (stack_valid(out_zdepth))
        stack_store_float(stack, out_zdepth, zdepth);

    if (stack_valid(out_distance))
        stack_store_float(stack, out_distance, distance);
}

CCL_NAMESPACE_END