Cycles: remove prefix from source code file names

Remove prefix of filenames that is the same as the folder name. This used
to help when #includes were using individual files, but now they are always
relative to the cycles root directory and so the prefixes are redundant.

For patches and branches, git merge and rebase should be able to detect the
renames and move over code to the right file.

1 files changed, 177 insertions, 0 deletions

diff --git a/intern/cycles/kernel/sample/mapping.h b/intern/cycles/kernel/sample/mapping.h
new file mode 100644
index 00000000000..3297aa2a29a
--- /dev/null
+++ b/intern/cycles/kernel/sample/mapping.h
@@ -0,0 +1,177 @@
+/*
+ * Parts adapted from Open Shading Language with this license:
+ *
+ * Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
+ * All Rights Reserved.
+ *
+ * Modifications Copyright 2011, 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
+
+/* distribute uniform xy on [0,1] over unit disk [-1,1] */
+ccl_device void to_unit_disk(ccl_private float *x, ccl_private float *y)
+{
+  float phi = M_2PI_F * (*x);
+  float r = sqrtf(*y);
+
+  *x = r * cosf(phi);
+  *y = r * sinf(phi);
+}
+
+/* return an orthogonal tangent and bitangent given a normal and tangent that
+ * may not be exactly orthogonal */
+ccl_device void make_orthonormals_tangent(const float3 N,
+                                          const float3 T,
+                                          ccl_private float3 *a,
+                                          ccl_private float3 *b)
+{
+  *b = normalize(cross(N, T));
+  *a = cross(*b, N);
+}
+
+/* sample direction with cosine weighted distributed in hemisphere */
+ccl_device_inline void sample_cos_hemisphere(
+    const float3 N, float randu, float randv, ccl_private float3 *omega_in, ccl_private float *pdf)
+{
+  to_unit_disk(&randu, &randv);
+  float costheta = sqrtf(max(1.0f - randu * randu - randv * randv, 0.0f));
+  float3 T, B;
+  make_orthonormals(N, &T, &B);
+  *omega_in = randu * T + randv * B + costheta * N;
+  *pdf = costheta * M_1_PI_F;
+}
+
+/* sample direction uniformly distributed in hemisphere */
+ccl_device_inline void sample_uniform_hemisphere(
+    const float3 N, float randu, float randv, ccl_private float3 *omega_in, ccl_private float *pdf)
+{
+  float z = randu;
+  float r = sqrtf(max(0.0f, 1.0f - z * z));
+  float phi = M_2PI_F * randv;
+  float x = r * cosf(phi);
+  float y = r * sinf(phi);
+
+  float3 T, B;
+  make_orthonormals(N, &T, &B);
+  *omega_in = x * T + y * B + z * N;
+  *pdf = 0.5f * M_1_PI_F;
+}
+
+/* sample direction uniformly distributed in cone */
+ccl_device_inline void sample_uniform_cone(const float3 N,
+                                           float angle,
+                                           float randu,
+                                           float randv,
+                                           ccl_private float3 *omega_in,
+                                           ccl_private float *pdf)
+{
+  float zMin = cosf(angle);
+  float z = zMin - zMin * randu + randu;
+  float r = safe_sqrtf(1.0f - sqr(z));
+  float phi = M_2PI_F * randv;
+  float x = r * cosf(phi);
+  float y = r * sinf(phi);
+
+  float3 T, B;
+  make_orthonormals(N, &T, &B);
+  *omega_in = x * T + y * B + z * N;
+  *pdf = M_1_2PI_F / (1.0f - zMin);
+}
+
+ccl_device_inline float pdf_uniform_cone(const float3 N, float3 D, float angle)
+{
+  float zMin = cosf(angle);
+  float z = dot(N, D);
+  if (z > zMin) {
+    return M_1_2PI_F / (1.0f - zMin);
+  }
+  return 0.0f;
+}
+
+/* sample uniform point on the surface of a sphere */
+ccl_device float3 sample_uniform_sphere(float u1, float u2)
+{
+  float z = 1.0f - 2.0f * u1;
+  float r = sqrtf(fmaxf(0.0f, 1.0f - z * z));
+  float phi = M_2PI_F * u2;
+  float x = r * cosf(phi);
+  float y = r * sinf(phi);
+
+  return make_float3(x, y, z);
+}
+
+/* distribute uniform xy on [0,1] over unit disk [-1,1], with concentric mapping
+ * to better preserve stratification for some RNG sequences */
+ccl_device float2 concentric_sample_disk(float u1, float u2)
+{
+  float phi, r;
+  float a = 2.0f * u1 - 1.0f;
+  float b = 2.0f * u2 - 1.0f;
+
+  if (a == 0.0f && b == 0.0f) {
+    return zero_float2();
+  }
+  else if (a * a > b * b) {
+    r = a;
+    phi = M_PI_4_F * (b / a);
+  }
+  else {
+    r = b;
+    phi = M_PI_2_F - M_PI_4_F * (a / b);
+  }
+
+  return make_float2(r * cosf(phi), r * sinf(phi));
+}
+
+/* sample point in unit polygon with given number of corners and rotation */
+ccl_device float2 regular_polygon_sample(float corners, float rotation, float u, float v)
+{
+  /* sample corner number and reuse u */
+  float corner = floorf(u * corners);
+  u = u * corners - corner;
+
+  /* uniform sampled triangle weights */
+  u = sqrtf(u);
+  v = v * u;
+  u = 1.0f - u;
+
+  /* point in triangle */
+  float angle = M_PI_F / corners;
+  float2 p = make_float2((u + v) * cosf(angle), (u - v) * sinf(angle));
+
+  /* rotate */
+  rotation += corner * 2.0f * angle;
+
+  float cr = cosf(rotation);
+  float sr = sinf(rotation);
+
+  return make_float2(cr * p.x - sr * p.y, sr * p.x + cr * p.y);
+}
+
+CCL_NAMESPACE_END