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/*
* Adapted from Open Shading Language with this license:
*
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
* All Rights Reserved.
*
* Modifications Copyright 2013, Blender Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Sony Pictures Imageworks nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
CCL_NAMESPACE_BEGIN
/* Wireframe Node */
ccl_device_inline float wireframe(KernelGlobals kg,
ccl_private ShaderData *sd,
float size,
int pixel_size,
ccl_private float3 *P)
{
#ifdef __HAIR__
if (sd->prim != PRIM_NONE && sd->type & PRIMITIVE_ALL_TRIANGLE)
#else
if (sd->prim != PRIM_NONE)
#endif
{
float3 Co[3];
float pixelwidth = 1.0f;
/* Triangles */
int np = 3;
if (sd->type & PRIMITIVE_TRIANGLE)
triangle_vertices(kg, sd->prim, Co);
else
motion_triangle_vertices(kg, sd->object, sd->prim, sd->time, Co);
if (!(sd->object_flag & SD_OBJECT_TRANSFORM_APPLIED)) {
object_position_transform(kg, sd, &Co[0]);
object_position_transform(kg, sd, &Co[1]);
object_position_transform(kg, sd, &Co[2]);
}
if (pixel_size) {
// Project the derivatives of P to the viewing plane defined
// by I so we have a measure of how big is a pixel at this point
float pixelwidth_x = len(sd->dP.dx - dot(sd->dP.dx, sd->I) * sd->I);
float pixelwidth_y = len(sd->dP.dy - dot(sd->dP.dy, sd->I) * sd->I);
// Take the average of both axis' length
pixelwidth = (pixelwidth_x + pixelwidth_y) * 0.5f;
}
// Use half the width as the neighbor face will render the
// other half. And take the square for fast comparison
pixelwidth *= 0.5f * size;
pixelwidth *= pixelwidth;
for (int i = 0; i < np; i++) {
int i2 = i ? i - 1 : np - 1;
float3 dir = *P - Co[i];
float3 edge = Co[i] - Co[i2];
float3 crs = cross(edge, dir);
// At this point dot(crs, crs) / dot(edge, edge) is
// the square of area / length(edge) == square of the
// distance to the edge.
if (dot(crs, crs) < (dot(edge, edge) * pixelwidth))
return 1.0f;
}
}
return 0.0f;
}
ccl_device_noinline void svm_node_wireframe(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
uint4 node)
{
uint in_size = node.y;
uint out_fac = node.z;
uint use_pixel_size, bump_offset;
svm_unpack_node_uchar2(node.w, &use_pixel_size, &bump_offset);
/* Input Data */
float size = stack_load_float(stack, in_size);
int pixel_size = (int)use_pixel_size;
/* Calculate wireframe */
float f = wireframe(kg, sd, size, pixel_size, &sd->P);
/* TODO(sergey): Think of faster way to calculate derivatives. */
if (bump_offset == NODE_BUMP_OFFSET_DX) {
float3 Px = sd->P - sd->dP.dx;
f += (f - wireframe(kg, sd, size, pixel_size, &Px)) / len(sd->dP.dx);
}
else if (bump_offset == NODE_BUMP_OFFSET_DY) {
float3 Py = sd->P - sd->dP.dy;
f += (f - wireframe(kg, sd, size, pixel_size, &Py)) / len(sd->dP.dy);
}
if (stack_valid(out_fac))
stack_store_float(stack, out_fac, f);
}
CCL_NAMESPACE_END
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