forked from bartvdbraak/blender
Brecht Van Lommel
c18712e868
This to avoids build conflicts with libc++ on FreeBSD, these __ prefixed values are reserved for compilers. I apologize to anyone who has patches or branches and has to go through the pain of merging this change, it may be easiest to do these same replacements in your code and then apply/merge the patch. Ref T37477.
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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CCL_NAMESPACE_BEGIN
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#ifdef __HAIR__
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/* curve attributes */
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ccl_device float curve_attribute_float(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float *dx, float *dy)
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{
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if(elem == ATTR_ELEMENT_CURVE) {
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = 0.0f;
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if(dy) *dy = 0.0f;
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#endif
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return kernel_tex_fetch(__attributes_float, offset + sd->prim);
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}
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else if(elem == ATTR_ELEMENT_CURVE_KEY) {
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + sd->segment;
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int k1 = k0 + 1;
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float f0 = kernel_tex_fetch(__attributes_float, offset + k0);
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float f1 = kernel_tex_fetch(__attributes_float, offset + k1);
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = sd->du.dx*(f1 - f0);
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if(dy) *dy = 0.0f;
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#endif
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return (1.0f - sd->u)*f0 + sd->u*f1;
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}
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else {
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = 0.0f;
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if(dy) *dy = 0.0f;
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#endif
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return 0.0f;
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}
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}
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ccl_device float3 curve_attribute_float3(KernelGlobals *kg, const ShaderData *sd, AttributeElement elem, int offset, float3 *dx, float3 *dy)
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{
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if(elem == ATTR_ELEMENT_CURVE) {
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/* idea: we can't derive any useful differentials here, but for tiled
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* mipmap image caching it would be useful to avoid reading the highest
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* detail level always. maybe a derivative based on the hair density
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* could be computed somehow? */
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
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if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
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#endif
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return float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + sd->prim));
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}
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else if(elem == ATTR_ELEMENT_CURVE_KEY) {
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + sd->segment;
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int k1 = k0 + 1;
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float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + k0));
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float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, offset + k1));
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = sd->du.dx*(f1 - f0);
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if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
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#endif
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return (1.0f - sd->u)*f0 + sd->u*f1;
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}
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else {
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#ifdef __RAY_DIFFERENTIALS__
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if(dx) *dx = make_float3(0.0f, 0.0f, 0.0f);
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if(dy) *dy = make_float3(0.0f, 0.0f, 0.0f);
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#endif
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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}
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/* hair info node functions */
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ccl_device float curve_thickness(KernelGlobals *kg, ShaderData *sd)
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{
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float r = 0.0f;
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if(sd->segment != ~0) {
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + sd->segment;
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int k1 = k0 + 1;
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float4 P1 = kernel_tex_fetch(__curve_keys, k0);
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float4 P2 = kernel_tex_fetch(__curve_keys, k1);
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r = (P2.w - P1.w) * sd->u + P1.w;
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}
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return r*2.0f;
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}
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ccl_device float3 curve_tangent_normal(KernelGlobals *kg, ShaderData *sd)
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{
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float3 tgN = make_float3(0.0f,0.0f,0.0f);
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if(sd->segment != ~0) {
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tgN = -(-sd->I - sd->dPdu * (dot(sd->dPdu,-sd->I) / len_squared(sd->dPdu)));
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tgN = normalize(tgN);
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/* need to find suitable scaled gd for corrected normal */
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#if 0
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tgN = normalize(tgN - gd * sd->dPdu);
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#endif
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}
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return tgN;
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}
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#endif
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CCL_NAMESPACE_END
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