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, 219 insertions, 0 deletions

diff --git a/intern/cycles/kernel/integrator/shade_background.h b/intern/cycles/kernel/integrator/shade_background.h
new file mode 100644
index 00000000000..71a590749bd
--- /dev/null
+++ b/intern/cycles/kernel/integrator/shade_background.h
@@ -0,0 +1,219 @@
+/*
+ * Copyright 2011-2021 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.
+ */
+
+#pragma once
+
+#include "kernel/film/accumulate.h"
+#include "kernel/integrator/shader_eval.h"
+#include "kernel/light/light.h"
+#include "kernel/light/sample.h"
+#include "kernel/sample/mis.h"
+
+CCL_NAMESPACE_BEGIN
+
+ccl_device float3 integrator_eval_background_shader(KernelGlobals kg,
+                                                    IntegratorState state,
+                                                    ccl_global float *ccl_restrict render_buffer)
+{
+#ifdef __BACKGROUND__
+  const int shader = kernel_data.background.surface_shader;
+  const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
+
+  /* Use visibility flag to skip lights. */
+  if (shader & SHADER_EXCLUDE_ANY) {
+    if (((shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) ||
+        ((shader & SHADER_EXCLUDE_GLOSSY) && ((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) ==
+                                              (PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) ||
+        ((shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) ||
+        ((shader & SHADER_EXCLUDE_CAMERA) && (path_flag & PATH_RAY_CAMERA)) ||
+        ((shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER)))
+      return zero_float3();
+  }
+
+  /* Use fast constant background color if available. */
+  float3 L = zero_float3();
+  if (!shader_constant_emission_eval(kg, shader, &L)) {
+    /* Evaluate background shader. */
+
+    /* TODO: does aliasing like this break automatic SoA in CUDA?
+     * Should we instead store closures separate from ShaderData? */
+    ShaderDataTinyStorage emission_sd_storage;
+    ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage);
+
+    PROFILING_INIT_FOR_SHADER(kg, PROFILING_SHADE_LIGHT_SETUP);
+    shader_setup_from_background(kg,
+                                 emission_sd,
+                                 INTEGRATOR_STATE(state, ray, P),
+                                 INTEGRATOR_STATE(state, ray, D),
+                                 INTEGRATOR_STATE(state, ray, time));
+
+    PROFILING_SHADER(emission_sd->object, emission_sd->shader);
+    PROFILING_EVENT(PROFILING_SHADE_LIGHT_EVAL);
+    shader_eval_surface<KERNEL_FEATURE_NODE_MASK_SURFACE_LIGHT>(
+        kg, state, emission_sd, render_buffer, path_flag | PATH_RAY_EMISSION);
+
+    L = shader_background_eval(emission_sd);
+  }
+
+  /* Background MIS weights. */
+#  ifdef __BACKGROUND_MIS__
+  /* Check if background light exists or if we should skip pdf. */
+  if (!(INTEGRATOR_STATE(state, path, flag) & PATH_RAY_MIS_SKIP) &&
+      kernel_data.background.use_mis) {
+    const float3 ray_P = INTEGRATOR_STATE(state, ray, P);
+    const float3 ray_D = INTEGRATOR_STATE(state, ray, D);
+    const float mis_ray_pdf = INTEGRATOR_STATE(state, path, mis_ray_pdf);
+    const float mis_ray_t = INTEGRATOR_STATE(state, path, mis_ray_t);
+
+    /* multiple importance sampling, get background light pdf for ray
+     * direction, and compute weight with respect to BSDF pdf */
+    const float pdf = background_light_pdf(kg, ray_P - ray_D * mis_ray_t, ray_D);
+    const float mis_weight = power_heuristic(mis_ray_pdf, pdf);
+
+    L *= mis_weight;
+  }
+#  endif
+
+  return L;
+#else
+  return make_float3(0.8f, 0.8f, 0.8f);
+#endif
+}
+
+ccl_device_inline void integrate_background(KernelGlobals kg,
+                                            IntegratorState state,
+                                            ccl_global float *ccl_restrict render_buffer)
+{
+  /* Accumulate transparency for transparent background. We can skip background
+   * shader evaluation unless a background pass is used. */
+  bool eval_background = true;
+  float transparent = 0.0f;
+
+  const bool is_transparent_background_ray = kernel_data.background.transparent &&
+                                             (INTEGRATOR_STATE(state, path, flag) &
+                                              PATH_RAY_TRANSPARENT_BACKGROUND);
+
+  if (is_transparent_background_ray) {
+    transparent = average(INTEGRATOR_STATE(state, path, throughput));
+
+#ifdef __PASSES__
+    eval_background = (kernel_data.film.light_pass_flag & PASSMASK(BACKGROUND));
+#else
+    eval_background = false;
+#endif
+  }
+
+  /* Evaluate background shader. */
+  float3 L = (eval_background) ? integrator_eval_background_shader(kg, state, render_buffer) :
+                                 zero_float3();
+
+  /* When using the ao bounces approximation, adjust background
+   * shader intensity with ao factor. */
+  if (path_state_ao_bounce(kg, state)) {
+    L *= kernel_data.integrator.ao_bounces_factor;
+  }
+
+  /* Write to render buffer. */
+  kernel_accum_background(kg, state, L, transparent, is_transparent_background_ray, render_buffer);
+}
+
+ccl_device_inline void integrate_distant_lights(KernelGlobals kg,
+                                                IntegratorState state,
+                                                ccl_global float *ccl_restrict render_buffer)
+{
+  const float3 ray_D = INTEGRATOR_STATE(state, ray, D);
+  const float ray_time = INTEGRATOR_STATE(state, ray, time);
+  LightSample ls ccl_optional_struct_init;
+  for (int lamp = 0; lamp < kernel_data.integrator.num_all_lights; lamp++) {
+    if (light_sample_from_distant_ray(kg, ray_D, lamp, &ls)) {
+      /* Use visibility flag to skip lights. */
+#ifdef __PASSES__
+      const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
+
+      if (ls.shader & SHADER_EXCLUDE_ANY) {
+        if (((ls.shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) ||
+            ((ls.shader & SHADER_EXCLUDE_GLOSSY) &&
+             ((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) ==
+              (PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) ||
+            ((ls.shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) ||
+            ((ls.shader & SHADER_EXCLUDE_CAMERA) && (path_flag & PATH_RAY_CAMERA)) ||
+            ((ls.shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER)))
+          return;
+      }
+#endif
+
+      /* Evaluate light shader. */
+      /* TODO: does aliasing like this break automatic SoA in CUDA? */
+      ShaderDataTinyStorage emission_sd_storage;
+      ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage);
+      float3 light_eval = light_sample_shader_eval(kg, state, emission_sd, &ls, ray_time);
+      if (is_zero(light_eval)) {
+        return;
+      }
+
+      /* MIS weighting. */
+      if (!(path_flag & PATH_RAY_MIS_SKIP)) {
+        /* multiple importance sampling, get regular light pdf,
+         * and compute weight with respect to BSDF pdf */
+        const float mis_ray_pdf = INTEGRATOR_STATE(state, path, mis_ray_pdf);
+        const float mis_weight = power_heuristic(mis_ray_pdf, ls.pdf);
+        light_eval *= mis_weight;
+      }
+
+      /* Write to render buffer. */
+      const float3 throughput = INTEGRATOR_STATE(state, path, throughput);
+      kernel_accum_emission(kg, state, throughput, light_eval, render_buffer);
+    }
+  }
+}
+
+ccl_device void integrator_shade_background(KernelGlobals kg,
+                                            IntegratorState state,
+                                            ccl_global float *ccl_restrict render_buffer)
+{
+  PROFILING_INIT(kg, PROFILING_SHADE_LIGHT_SETUP);
+
+  /* TODO: unify these in a single loop to only have a single shader evaluation call. */
+  integrate_distant_lights(kg, state, render_buffer);
+  integrate_background(kg, state, render_buffer);
+
+#ifdef __SHADOW_CATCHER__
+  if (INTEGRATOR_STATE(state, path, flag) & PATH_RAY_SHADOW_CATCHER_BACKGROUND) {
+    INTEGRATOR_STATE_WRITE(state, path, flag) &= ~PATH_RAY_SHADOW_CATCHER_BACKGROUND;
+
+    const int isect_prim = INTEGRATOR_STATE(state, isect, prim);
+    const int isect_type = INTEGRATOR_STATE(state, isect, type);
+    const int shader = intersection_get_shader_from_isect_prim(kg, isect_prim, isect_type);
+    const int shader_flags = kernel_tex_fetch(__shaders, shader).flags;
+
+    if (shader_flags & SD_HAS_RAYTRACE) {
+      INTEGRATOR_PATH_NEXT_SORTED(DEVICE_KERNEL_INTEGRATOR_SHADE_BACKGROUND,
+                                  DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE_RAYTRACE,
+                                  shader);
+    }
+    else {
+      INTEGRATOR_PATH_NEXT_SORTED(DEVICE_KERNEL_INTEGRATOR_SHADE_BACKGROUND,
+                                  DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE,
+                                  shader);
+    }
+    return;
+  }
+#endif
+
+  INTEGRATOR_PATH_TERMINATE(DEVICE_KERNEL_INTEGRATOR_SHADE_BACKGROUND);
+}
+
+CCL_NAMESPACE_END