Cleanup: split Cycles Hair and Mesh classes, with Geometry base class

1 files changed, 489 insertions, 0 deletions

diff --git a/intern/cycles/render/hair.cpp b/intern/cycles/render/hair.cpp
new file mode 100644
index 00000000000..a35d4b6f1da
--- /dev/null
+++ b/intern/cycles/render/hair.cpp
@@ -0,0 +1,489 @@
+/*
+ * Copyright 2011-2020 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "render/curves.h"
+#include "render/hair.h"
+#include "render/scene.h"
+
+CCL_NAMESPACE_BEGIN
+
+/* Hair Curve */
+
+void Hair::Curve::bounds_grow(const int k,
+                              const float3 *curve_keys,
+                              const float *curve_radius,
+                              BoundBox &bounds) const
+{
+  float3 P[4];
+
+  P[0] = curve_keys[max(first_key + k - 1, first_key)];
+  P[1] = curve_keys[first_key + k];
+  P[2] = curve_keys[first_key + k + 1];
+  P[3] = curve_keys[min(first_key + k + 2, first_key + num_keys - 1)];
+
+  float3 lower;
+  float3 upper;
+
+  curvebounds(&lower.x, &upper.x, P, 0);
+  curvebounds(&lower.y, &upper.y, P, 1);
+  curvebounds(&lower.z, &upper.z, P, 2);
+
+  float mr = max(curve_radius[first_key + k], curve_radius[first_key + k + 1]);
+
+  bounds.grow(lower, mr);
+  bounds.grow(upper, mr);
+}
+
+void Hair::Curve::bounds_grow(const int k,
+                              const float3 *curve_keys,
+                              const float *curve_radius,
+                              const Transform &aligned_space,
+                              BoundBox &bounds) const
+{
+  float3 P[4];
+
+  P[0] = curve_keys[max(first_key + k - 1, first_key)];
+  P[1] = curve_keys[first_key + k];
+  P[2] = curve_keys[first_key + k + 1];
+  P[3] = curve_keys[min(first_key + k + 2, first_key + num_keys - 1)];
+
+  P[0] = transform_point(&aligned_space, P[0]);
+  P[1] = transform_point(&aligned_space, P[1]);
+  P[2] = transform_point(&aligned_space, P[2]);
+  P[3] = transform_point(&aligned_space, P[3]);
+
+  float3 lower;
+  float3 upper;
+
+  curvebounds(&lower.x, &upper.x, P, 0);
+  curvebounds(&lower.y, &upper.y, P, 1);
+  curvebounds(&lower.z, &upper.z, P, 2);
+
+  float mr = max(curve_radius[first_key + k], curve_radius[first_key + k + 1]);
+
+  bounds.grow(lower, mr);
+  bounds.grow(upper, mr);
+}
+
+void Hair::Curve::bounds_grow(float4 keys[4], BoundBox &bounds) const
+{
+  float3 P[4] = {
+      float4_to_float3(keys[0]),
+      float4_to_float3(keys[1]),
+      float4_to_float3(keys[2]),
+      float4_to_float3(keys[3]),
+  };
+
+  float3 lower;
+  float3 upper;
+
+  curvebounds(&lower.x, &upper.x, P, 0);
+  curvebounds(&lower.y, &upper.y, P, 1);
+  curvebounds(&lower.z, &upper.z, P, 2);
+
+  float mr = max(keys[1].w, keys[2].w);
+
+  bounds.grow(lower, mr);
+  bounds.grow(upper, mr);
+}
+
+void Hair::Curve::motion_keys(const float3 *curve_keys,
+                              const float *curve_radius,
+                              const float3 *key_steps,
+                              size_t num_curve_keys,
+                              size_t num_steps,
+                              float time,
+                              size_t k0,
+                              size_t k1,
+                              float4 r_keys[2]) const
+{
+  /* Figure out which steps we need to fetch and their interpolation factor. */
+  const size_t max_step = num_steps - 1;
+  const size_t step = min((int)(time * max_step), max_step - 1);
+  const float t = time * max_step - step;
+  /* Fetch vertex coordinates. */
+  float4 curr_keys[2];
+  float4 next_keys[2];
+  keys_for_step(
+      curve_keys, curve_radius, key_steps, num_curve_keys, num_steps, step, k0, k1, curr_keys);
+  keys_for_step(
+      curve_keys, curve_radius, key_steps, num_curve_keys, num_steps, step + 1, k0, k1, next_keys);
+  /* Interpolate between steps. */
+  r_keys[0] = (1.0f - t) * curr_keys[0] + t * next_keys[0];
+  r_keys[1] = (1.0f - t) * curr_keys[1] + t * next_keys[1];
+}
+
+void Hair::Curve::cardinal_motion_keys(const float3 *curve_keys,
+                                       const float *curve_radius,
+                                       const float3 *key_steps,
+                                       size_t num_curve_keys,
+                                       size_t num_steps,
+                                       float time,
+                                       size_t k0,
+                                       size_t k1,
+                                       size_t k2,
+                                       size_t k3,
+                                       float4 r_keys[4]) const
+{
+  /* Figure out which steps we need to fetch and their interpolation factor. */
+  const size_t max_step = num_steps - 1;
+  const size_t step = min((int)(time * max_step), max_step - 1);
+  const float t = time * max_step - step;
+  /* Fetch vertex coordinates. */
+  float4 curr_keys[4];
+  float4 next_keys[4];
+  cardinal_keys_for_step(curve_keys,
+                         curve_radius,
+                         key_steps,
+                         num_curve_keys,
+                         num_steps,
+                         step,
+                         k0,
+                         k1,
+                         k2,
+                         k3,
+                         curr_keys);
+  cardinal_keys_for_step(curve_keys,
+                         curve_radius,
+                         key_steps,
+                         num_curve_keys,
+                         num_steps,
+                         step + 1,
+                         k0,
+                         k1,
+                         k2,
+                         k3,
+                         next_keys);
+  /* Interpolate between steps. */
+  r_keys[0] = (1.0f - t) * curr_keys[0] + t * next_keys[0];
+  r_keys[1] = (1.0f - t) * curr_keys[1] + t * next_keys[1];
+  r_keys[2] = (1.0f - t) * curr_keys[2] + t * next_keys[2];
+  r_keys[3] = (1.0f - t) * curr_keys[3] + t * next_keys[3];
+}
+
+void Hair::Curve::keys_for_step(const float3 *curve_keys,
+                                const float *curve_radius,
+                                const float3 *key_steps,
+                                size_t num_curve_keys,
+                                size_t num_steps,
+                                size_t step,
+                                size_t k0,
+                                size_t k1,
+                                float4 r_keys[2]) const
+{
+  k0 = max(k0, 0);
+  k1 = min(k1, num_keys - 1);
+  const size_t center_step = ((num_steps - 1) / 2);
+  if (step == center_step) {
+    /* Center step: regular key location. */
+    /* TODO(sergey): Consider adding make_float4(float3, float)
+     * function.
+     */
+    r_keys[0] = make_float4(curve_keys[first_key + k0].x,
+                            curve_keys[first_key + k0].y,
+                            curve_keys[first_key + k0].z,
+                            curve_radius[first_key + k0]);
+    r_keys[1] = make_float4(curve_keys[first_key + k1].x,
+                            curve_keys[first_key + k1].y,
+                            curve_keys[first_key + k1].z,
+                            curve_radius[first_key + k1]);
+  }
+  else {
+    /* Center step is not stored in this array. */
+    if (step > center_step) {
+      step--;
+    }
+    const size_t offset = first_key + step * num_curve_keys;
+    r_keys[0] = make_float4(key_steps[offset + k0].x,
+                            key_steps[offset + k0].y,
+                            key_steps[offset + k0].z,
+                            curve_radius[first_key + k0]);
+    r_keys[1] = make_float4(key_steps[offset + k1].x,
+                            key_steps[offset + k1].y,
+                            key_steps[offset + k1].z,
+                            curve_radius[first_key + k1]);
+  }
+}
+
+void Hair::Curve::cardinal_keys_for_step(const float3 *curve_keys,
+                                         const float *curve_radius,
+                                         const float3 *key_steps,
+                                         size_t num_curve_keys,
+                                         size_t num_steps,
+                                         size_t step,
+                                         size_t k0,
+                                         size_t k1,
+                                         size_t k2,
+                                         size_t k3,
+                                         float4 r_keys[4]) const
+{
+  k0 = max(k0, 0);
+  k3 = min(k3, num_keys - 1);
+  const size_t center_step = ((num_steps - 1) / 2);
+  if (step == center_step) {
+    /* Center step: regular key location. */
+    r_keys[0] = make_float4(curve_keys[first_key + k0].x,
+                            curve_keys[first_key + k0].y,
+                            curve_keys[first_key + k0].z,
+                            curve_radius[first_key + k0]);
+    r_keys[1] = make_float4(curve_keys[first_key + k1].x,
+                            curve_keys[first_key + k1].y,
+                            curve_keys[first_key + k1].z,
+                            curve_radius[first_key + k1]);
+    r_keys[2] = make_float4(curve_keys[first_key + k2].x,
+                            curve_keys[first_key + k2].y,
+                            curve_keys[first_key + k2].z,
+                            curve_radius[first_key + k2]);
+    r_keys[3] = make_float4(curve_keys[first_key + k3].x,
+                            curve_keys[first_key + k3].y,
+                            curve_keys[first_key + k3].z,
+                            curve_radius[first_key + k3]);
+  }
+  else {
+    /* Center step is not stored in this array. */
+    if (step > center_step) {
+      step--;
+    }
+    const size_t offset = first_key + step * num_curve_keys;
+    r_keys[0] = make_float4(key_steps[offset + k0].x,
+                            key_steps[offset + k0].y,
+                            key_steps[offset + k0].z,
+                            curve_radius[first_key + k0]);
+    r_keys[1] = make_float4(key_steps[offset + k1].x,
+                            key_steps[offset + k1].y,
+                            key_steps[offset + k1].z,
+                            curve_radius[first_key + k1]);
+    r_keys[2] = make_float4(key_steps[offset + k2].x,
+                            key_steps[offset + k2].y,
+                            key_steps[offset + k2].z,
+                            curve_radius[first_key + k2]);
+    r_keys[3] = make_float4(key_steps[offset + k3].x,
+                            key_steps[offset + k3].y,
+                            key_steps[offset + k3].z,
+                            curve_radius[first_key + k3]);
+  }
+}
+
+/* Hair */
+
+NODE_DEFINE(Hair)
+{
+  NodeType *type = NodeType::add("hair", create, NodeType::NONE, Geometry::node_base_type);
+
+  SOCKET_POINT_ARRAY(curve_keys, "Curve Keys", array<float3>());
+  SOCKET_FLOAT_ARRAY(curve_radius, "Curve Radius", array<float>());
+  SOCKET_INT_ARRAY(curve_first_key, "Curve First Key", array<int>());
+  SOCKET_INT_ARRAY(curve_shader, "Curve Shader", array<int>());
+
+  return type;
+}
+
+Hair::Hair() : Geometry(node_type, Geometry::HAIR)
+{
+  curvekey_offset = 0;
+
+  attributes.hair = this;
+}
+
+Hair::~Hair()
+{
+}
+
+void Hair::resize_curves(int numcurves, int numkeys)
+{
+  curve_keys.resize(numkeys);
+  curve_radius.resize(numkeys);
+  curve_first_key.resize(numcurves);
+  curve_shader.resize(numcurves);
+
+  attributes.resize();
+}
+
+void Hair::reserve_curves(int numcurves, int numkeys)
+{
+  curve_keys.reserve(numkeys);
+  curve_radius.reserve(numkeys);
+  curve_first_key.reserve(numcurves);
+  curve_shader.reserve(numcurves);
+
+  attributes.resize(true);
+}
+
+void Hair::clear()
+{
+  Geometry::clear();
+
+  curve_keys.clear();
+  curve_radius.clear();
+  curve_first_key.clear();
+  curve_shader.clear();
+
+  attributes.clear();
+}
+
+void Hair::add_curve_key(float3 co, float radius)
+{
+  curve_keys.push_back_reserved(co);
+  curve_radius.push_back_reserved(radius);
+}
+
+void Hair::add_curve(int first_key, int shader)
+{
+  curve_first_key.push_back_reserved(first_key);
+  curve_shader.push_back_reserved(shader);
+}
+
+void Hair::copy_center_to_motion_step(const int motion_step)
+{
+  Attribute *attr_mP = attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
+  if (attr_mP) {
+    float3 *keys = &curve_keys[0];
+    size_t numkeys = curve_keys.size();
+    memcpy(attr_mP->data_float3() + motion_step * numkeys, keys, sizeof(float3) * numkeys);
+  }
+}
+
+void Hair::get_uv_tiles(ustring map, unordered_set<int> &tiles)
+{
+  Attribute *attr;
+
+  if (map.empty()) {
+    attr = attributes.find(ATTR_STD_UV);
+  }
+  else {
+    attr = attributes.find(map);
+  }
+
+  if (attr) {
+    attr->get_uv_tiles(this, ATTR_PRIM_CURVE, tiles);
+  }
+}
+
+void Hair::compute_bounds()
+{
+  BoundBox bnds = BoundBox::empty;
+  size_t curve_keys_size = curve_keys.size();
+
+  if (curve_keys_size > 0) {
+    for (size_t i = 0; i < curve_keys_size; i++)
+      bnds.grow(curve_keys[i], curve_radius[i]);
+
+    Attribute *curve_attr = attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
+    if (use_motion_blur && curve_attr) {
+      size_t steps_size = curve_keys.size() * (motion_steps - 1);
+      float3 *key_steps = curve_attr->data_float3();
+
+      for (size_t i = 0; i < steps_size; i++)
+        bnds.grow(key_steps[i]);
+    }
+
+    if (!bnds.valid()) {
+      bnds = BoundBox::empty;
+
+      /* skip nan or inf coordinates */
+      for (size_t i = 0; i < curve_keys_size; i++)
+        bnds.grow_safe(curve_keys[i], curve_radius[i]);
+
+      if (use_motion_blur && curve_attr) {
+        size_t steps_size = curve_keys.size() * (motion_steps - 1);
+        float3 *key_steps = curve_attr->data_float3();
+
+        for (size_t i = 0; i < steps_size; i++)
+          bnds.grow_safe(key_steps[i]);
+      }
+    }
+  }
+
+  if (!bnds.valid()) {
+    /* empty mesh */
+    bnds.grow(make_float3(0.0f, 0.0f, 0.0f));
+  }
+
+  bounds = bnds;
+}
+
+void Hair::apply_transform(const Transform &tfm, const bool apply_to_motion)
+{
+  /* compute uniform scale */
+  float3 c0 = transform_get_column(&tfm, 0);
+  float3 c1 = transform_get_column(&tfm, 1);
+  float3 c2 = transform_get_column(&tfm, 2);
+  float scalar = powf(fabsf(dot(cross(c0, c1), c2)), 1.0f / 3.0f);
+
+  /* apply transform to curve keys */
+  for (size_t i = 0; i < curve_keys.size(); i++) {
+    float3 co = transform_point(&tfm, curve_keys[i]);
+    float radius = curve_radius[i] * scalar;
+
+    /* scale for curve radius is only correct for uniform scale */
+    curve_keys[i] = co;
+    curve_radius[i] = radius;
+  }
+
+  if (apply_to_motion) {
+    Attribute *curve_attr = attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
+
+    if (curve_attr) {
+      /* apply transform to motion curve keys */
+      size_t steps_size = curve_keys.size() * (motion_steps - 1);
+      float4 *key_steps = curve_attr->data_float4();
+
+      for (size_t i = 0; i < steps_size; i++) {
+        float3 co = transform_point(&tfm, float4_to_float3(key_steps[i]));
+        float radius = key_steps[i].w * scalar;
+
+        /* scale for curve radius is only correct for uniform scale */
+        key_steps[i] = float3_to_float4(co);
+        key_steps[i].w = radius;
+      }
+    }
+  }
+}
+
+void Hair::pack_curves(Scene *scene,
+                       float4 *curve_key_co,
+                       float4 *curve_data,
+                       size_t curvekey_offset)
+{
+  size_t curve_keys_size = curve_keys.size();
+
+  /* pack curve keys */
+  if (curve_keys_size) {
+    float3 *keys_ptr = curve_keys.data();
+    float *radius_ptr = curve_radius.data();
+
+    for (size_t i = 0; i < curve_keys_size; i++)
+      curve_key_co[i] = make_float4(keys_ptr[i].x, keys_ptr[i].y, keys_ptr[i].z, radius_ptr[i]);
+  }
+
+  /* pack curve segments */
+  size_t curve_num = num_curves();
+
+  for (size_t i = 0; i < curve_num; i++) {
+    Curve curve = get_curve(i);
+    int shader_id = curve_shader[i];
+    Shader *shader = (shader_id < used_shaders.size()) ? used_shaders[shader_id] :
+                                                         scene->default_surface;
+    shader_id = scene->shader_manager->get_shader_id(shader, false);
+
+    curve_data[i] = make_float4(__int_as_float(curve.first_key + curvekey_offset),
+                                __int_as_float(curve.num_keys),
+                                __int_as_float(shader_id),
+                                0.0f);
+  }
+}
+
+CCL_NAMESPACE_END