forked from bartvdbraak/blender
a97bc1bedf
This attribute missed derivatives calculation. Not totally sure what's the proper approach for algebraic derivative calculation, so calculating them by definition. This isn't fastest way to do it in this case and could be replaced with some smarter magic in the wireframe calculation loop. At least currently implemented approach is better than nothing.
127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/*
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* Adapted from Open Shading Language with this license:
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*
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* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
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* All Rights Reserved.
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*
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* Modifications Copyright 2013, Blender Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Sony Pictures Imageworks nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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CCL_NAMESPACE_BEGIN
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/* Wireframe Node */
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ccl_device float wireframe(KernelGlobals *kg,
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ShaderData *sd,
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float size,
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int pixel_size,
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float3 *P)
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{
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#ifdef __HAIR__
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if (sd->prim != PRIM_NONE && sd->type & PRIMITIVE_ALL_TRIANGLE)
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#else
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if (sd->prim != PRIM_NONE)
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#endif
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{
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float3 Co[3];
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float pixelwidth = 1.0f;
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/* Triangles */
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int np = 3;
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if(sd->type & PRIMITIVE_TRIANGLE)
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triangle_vertices(kg, sd->prim, Co);
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else
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motion_triangle_vertices(kg, sd->object, sd->prim, sd->time, Co);
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if(!(sd->flag & SD_TRANSFORM_APPLIED)) {
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object_position_transform(kg, sd, &Co[0]);
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object_position_transform(kg, sd, &Co[1]);
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object_position_transform(kg, sd, &Co[2]);
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}
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if(pixel_size) {
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// Project the derivatives of P to the viewing plane defined
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// by I so we have a measure of how big is a pixel at this point
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float pixelwidth_x = len(sd->dP.dx - dot(sd->dP.dx, sd->I) * sd->I);
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float pixelwidth_y = len(sd->dP.dy - dot(sd->dP.dy, sd->I) * sd->I);
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// Take the average of both axis' length
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pixelwidth = (pixelwidth_x + pixelwidth_y) * 0.5f;
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}
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// Use half the width as the neighbor face will render the
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// other half. And take the square for fast comparison
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pixelwidth *= 0.5f * size;
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pixelwidth *= pixelwidth;
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for (int i = 0; i < np; i++) {
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int i2 = i ? i - 1 : np - 1;
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float3 dir = *P - Co[i];
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float3 edge = Co[i] - Co[i2];
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float3 crs = cross(edge, dir);
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// At this point dot(crs, crs) / dot(edge, edge) is
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// the square of area / length(edge) == square of the
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// distance to the edge.
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if (dot(crs, crs) < (dot(edge, edge) * pixelwidth))
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return 1.0f;
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}
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}
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return 0.0f;
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}
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ccl_device void svm_node_wireframe(KernelGlobals *kg,
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ShaderData *sd,
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float *stack,
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uint4 node)
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{
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uint in_size = node.y;
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uint out_fac = node.z;
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uint use_pixel_size, bump_offset;
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decode_node_uchar4(node.w, &use_pixel_size, &bump_offset, NULL, NULL);
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/* Input Data */
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float size = stack_load_float(stack, in_size);
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int pixel_size = (int)use_pixel_size;
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/* Calculate wireframe */
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float f = wireframe(kg, sd, size, pixel_size, &sd->P);
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/* TODO(sergey): Think of faster way to calculate derivatives. */
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if(bump_offset == NODE_BUMP_OFFSET_DX) {
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float3 Px = sd->P - sd->dP.dx;
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f += (f - wireframe(kg, sd, size, pixel_size, &Px)) / len(sd->dP.dx);
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}
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else if (bump_offset == NODE_BUMP_OFFSET_DY) {
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float3 Py = sd->P - sd->dP.dy;
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f += (f - wireframe(kg, sd, size, pixel_size, &Py)) / len(sd->dP.dy);
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}
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if (stack_valid(out_fac))
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stack_store_float(stack, out_fac, f);
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}
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CCL_NAMESPACE_END
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