Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/sky/include/sky_nishita.h

@@ -0,0 +1,48 @@
+/* SPDX-FileCopyrightText: 2020-2025 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup intern_sky_modal
+ */
+
+#pragma once
+
+void SKY_single_scattering_precompute_texture(float *pixels,
+                                              int stride,
+                                              int width,
+                                              int height,
+                                              float sun_elevation,
+                                              float altitude,
+                                              float air_density,
+                                              float aerosol_density,
+                                              float ozone_density);
+
+void SKY_single_scattering_precompute_sun(float sun_elevation,
+                                          float angular_diameter,
+                                          float altitude,
+                                          float air_density,
+                                          float aerosol_density,
+                                          float r_pixel_bottom[3],
+                                          float r_pixel_top[3]);
+
+void SKY_multiple_scattering_precompute_texture(float *pixels,
+                                                int stride,
+                                                int width,
+                                                int height,
+                                                float sun_elevation,
+                                                float altitude,
+                                                float air_density,
+                                                float aerosol_density,
+                                                float ozone_density);
+
+void SKY_multiple_scattering_precompute_sun(float sun_elevation,
+                                            float angular_diameter,
+                                            float altitude,
+                                            float air_density,
+                                            float aerosol_density,
+                                            float ozone_density,
+                                            float r_pixel_bottom[3],
+                                            float r_pixel_top[3]);
+
+float SKY_earth_intersection_angle(float altitude);