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Diffstat (limited to 'intern/cycles/kernel/svm/wireframe.h')
| -rw-r--r-- | intern/cycles/kernel/svm/wireframe.h | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/wireframe.h b/intern/cycles/kernel/svm/wireframe.h new file mode 100644 index 00000000000..530a9601bce --- /dev/null +++ b/intern/cycles/kernel/svm/wireframe.h @@ -0,0 +1,127 @@ +/* + * 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 |