forked from bartvdbraak/blender
102 lines
3.6 KiB
C
102 lines
3.6 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 void svm_node_wireframe(KernelGlobals *kg, ShaderData *sd, float *stack, uint in_size, uint out_fac, uint use_pixel_size)
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{
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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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/* Output */
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float f = 0.0f;
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/* Calculate wireframe */
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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 = sd->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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f = 1.0f;
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}
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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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