blender/intern/cycles/kernel/svm/svm_wireframe.h
Thomas Dinges 9bf7a2a8c4 Cycles / Wireframe node:
* Make sure we have valid geometry data, fixes a crash with Lamp objects.

Reported by lichtwerk in IRC, thanks!
2013-05-25 13:34:21 +00:00

98 lines
3.4 KiB
C

/*
* 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
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* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
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*/
CCL_NAMESPACE_BEGIN
/* Wireframe Node */
__device void svm_node_wireframe(KernelGlobals *kg, ShaderData *sd, float *stack, uint in_size, uint out_fac, uint use_pixel_size)
{
/* Input Data */
float size = stack_load_float(stack, in_size);
int pixel_size = (int)use_pixel_size;
/* Output */
float f = 0.0f;
/* Calculate wireframe */
#ifdef __HAIR__
if (sd->prim != ~0 && sd->segment == ~0) {
#else
if (sd->prim != ~0) {
#endif
float3 Co[3];
float pixelwidth = 1.0f;
/* Triangles */
float np = 3;
triangle_vertices(kg, sd->prim, Co);
if(!(sd->flag & SD_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 = sd->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))
f = 1.0f;
}
}
if (stack_valid(out_fac))
stack_store_float(stack, out_fac, f);
}
CCL_NAMESPACE_END