forked from bartvdbraak/blender
451ccf7396
This way curve file becomes much shorter and it's also easier to write a benchmark application to check performance before/after future changes.
220 lines
5.9 KiB
C
220 lines
5.9 KiB
C
/*
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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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/* Curve Primitive
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*
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* Curve primitive for rendering hair and fur. These can be render as flat
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* ribbons or curves with actual thickness. The curve can also be rendered as
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* line segments rather than curves for better performance.
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*/
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#ifdef __HAIR__
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/* Reading attributes on various curve elements */
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ccl_device float curve_attribute_float(KernelGlobals *kg, const ShaderData *sd, const AttributeDescriptor desc, float *dx, float *dy)
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{
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if(desc.element == 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, desc.offset + sd->prim);
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}
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else if(desc.element == ATTR_ELEMENT_CURVE_KEY || desc.element == ATTR_ELEMENT_CURVE_KEY_MOTION) {
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type);
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int k1 = k0 + 1;
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float f0 = kernel_tex_fetch(__attributes_float, desc.offset + k0);
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float f1 = kernel_tex_fetch(__attributes_float, desc.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, const AttributeDescriptor desc, float3 *dx, float3 *dy)
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{
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if(desc.element == 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, desc.offset + sd->prim));
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}
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else if(desc.element == ATTR_ELEMENT_CURVE_KEY || desc.element == ATTR_ELEMENT_CURVE_KEY_MOTION) {
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type);
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int k1 = k0 + 1;
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float3 f0 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.offset + k0));
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float3 f1 = float4_to_float3(kernel_tex_fetch(__attributes_float3, desc.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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/* Curve thickness */
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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->type & PRIMITIVE_ALL_CURVE) {
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type);
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int k1 = k0 + 1;
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float4 P_curve[2];
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if(sd->type & PRIMITIVE_CURVE) {
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P_curve[0]= kernel_tex_fetch(__curve_keys, k0);
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P_curve[1]= kernel_tex_fetch(__curve_keys, k1);
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}
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else {
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motion_curve_keys(kg, sd->object, sd->prim, sd->time, k0, k1, P_curve);
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}
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r = (P_curve[1].w - P_curve[0].w) * sd->u + P_curve[0].w;
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}
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return r*2.0f;
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}
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/* Curve location for motion pass, linear interpolation between keys and
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* ignoring radius because we do the same for the motion keys */
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ccl_device float3 curve_motion_center_location(KernelGlobals *kg, ShaderData *sd)
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{
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float4 curvedata = kernel_tex_fetch(__curves, sd->prim);
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int k0 = __float_as_int(curvedata.x) + PRIMITIVE_UNPACK_SEGMENT(sd->type);
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int k1 = k0 + 1;
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float4 P_curve[2];
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P_curve[0]= kernel_tex_fetch(__curve_keys, k0);
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P_curve[1]= kernel_tex_fetch(__curve_keys, k1);
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return float4_to_float3(P_curve[1]) * sd->u + float4_to_float3(P_curve[0]) * (1.0f - sd->u);
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}
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/* Curve tangent normal */
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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->type & PRIMITIVE_ALL_CURVE) {
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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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/* Curve bounds utility function */
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ccl_device_inline void curvebounds(float *lower, float *upper, float *extremta, float *extrema, float *extremtb, float *extremb, float p0, float p1, float p2, float p3)
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{
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float halfdiscroot = (p2 * p2 - 3 * p3 * p1);
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float ta = -1.0f;
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float tb = -1.0f;
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*extremta = -1.0f;
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*extremtb = -1.0f;
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*upper = p0;
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*lower = (p0 + p1) + (p2 + p3);
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*extrema = *upper;
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*extremb = *lower;
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if(*lower >= *upper) {
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*upper = *lower;
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*lower = p0;
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}
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if(halfdiscroot >= 0) {
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float inv3p3 = (1.0f/3.0f)/p3;
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halfdiscroot = sqrtf(halfdiscroot);
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ta = (-p2 - halfdiscroot) * inv3p3;
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tb = (-p2 + halfdiscroot) * inv3p3;
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}
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float t2;
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float t3;
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if(ta > 0.0f && ta < 1.0f) {
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t2 = ta * ta;
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t3 = t2 * ta;
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*extremta = ta;
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*extrema = p3 * t3 + p2 * t2 + p1 * ta + p0;
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*upper = fmaxf(*extrema, *upper);
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*lower = fminf(*extrema, *lower);
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}
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if(tb > 0.0f && tb < 1.0f) {
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t2 = tb * tb;
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t3 = t2 * tb;
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*extremtb = tb;
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*extremb = p3 * t3 + p2 * t2 + p1 * tb + p0;
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*upper = fmaxf(*extremb, *upper);
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*lower = fminf(*extremb, *lower);
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}
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}
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#endif /* __HAIR__ */
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CCL_NAMESPACE_END
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