kernel_displace.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 kernel_shader_evaluate(KernelGlobals *kg, uint4 *input, float3 *output, ShaderEvalType type, int i)
{
    ShaderData sd;
    uint4 in = input[i];
    float3 out;

    if(type == SHADER_EVAL_DISPLACE) {
        /* setup shader data */
        int object = in.x;
        int prim = in.y;
        float u = __int_as_float(in.z);
        float v = __int_as_float(in.w);

        shader_setup_from_displace(kg, &sd, object, prim, u, v);

        /* evaluate */
        float3 P = sd.P;
        shader_eval_displacement(kg, &sd);
        out = sd.P - P;
    }
    else { // SHADER_EVAL_BACKGROUND
        /* setup ray */
        Ray ray;

        ray.P = make_float3(0.0f, 0.0f, 0.0f);
        ray.D = make_float3(__int_as_float(in.x), __int_as_float(in.y), __int_as_float(in.z));
        ray.t = 0.0f;

#ifdef __RAY_DIFFERENTIALS__
        ray.dD.dx = make_float3(0.0f, 0.0f, 0.0f);
        ray.dD.dy = make_float3(0.0f, 0.0f, 0.0f);
        ray.dP.dx = make_float3(0.0f, 0.0f, 0.0f);
        ray.dP.dy = make_float3(0.0f, 0.0f, 0.0f);
#endif

        /* setup shader data */
        shader_setup_from_background(kg, &sd, &ray);

        /* evaluate */
        int flag = 0; /* we can't know which type of BSDF this is for */
        out = shader_eval_background(kg, &sd, flag);
    }
    
    /* write output */
    output[i] = out;
}

CCL_NAMESPACE_END