GPU: Split gpu_shader_material into multiple files.

This patch continue the efforts to split the `gpu_shader_material` file
started in D5569.

Dependency resolution is now recursive. Each shading node gets its own
file. Additionally, some utility files are added to be shared between
files, like `math_util`, `color_util`, and `hash`. Some files are always
included because they may be used in the execution function, like
`world_normals`.

Some glsl functions appeared to be unused, so they were removed, like
`output_node`, `bits_to_01`, and `exp_blender`. Other functions have
been renamed to be more general and get used as utils, like `texco_norm`
which became `vector_normalize`.

A lot of the opengl tests fails, but those same tests also fail in
master, so this is probably unrelated to this patch.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5616

1 files changed, 31 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_light_path.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_light_path.glsl
new file mode 100644
index 00000000000..50c87e3f105
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_light_path.glsl
@@ -0,0 +1,31 @@
+void node_light_path(out float is_camera_ray,
+                     out float is_shadow_ray,
+                     out float is_diffuse_ray,
+                     out float is_glossy_ray,
+                     out float is_singular_ray,
+                     out float is_reflection_ray,
+                     out float is_transmission_ray,
+                     out float ray_length,
+                     out float ray_depth,
+                     out float diffuse_depth,
+                     out float glossy_depth,
+                     out float transparent_depth,
+                     out float transmission_depth)
+{
+  /* Supported. */
+  is_camera_ray = (rayType == EEVEE_RAY_CAMERA) ? 1.0 : 0.0;
+  is_shadow_ray = (rayType == EEVEE_RAY_SHADOW) ? 1.0 : 0.0;
+  is_diffuse_ray = (rayType == EEVEE_RAY_DIFFUSE) ? 1.0 : 0.0;
+  is_glossy_ray = (rayType == EEVEE_RAY_GLOSSY) ? 1.0 : 0.0;
+  /* Kind of supported. */
+  is_singular_ray = is_glossy_ray;
+  is_reflection_ray = is_glossy_ray;
+  is_transmission_ray = is_glossy_ray;
+  ray_depth = rayDepth;
+  diffuse_depth = (is_diffuse_ray == 1.0) ? rayDepth : 0.0;
+  glossy_depth = (is_glossy_ray == 1.0) ? rayDepth : 0.0;
+  transmission_depth = (is_transmission_ray == 1.0) ? glossy_depth : 0.0;
+  /* Not supported. */
+  ray_length = 1.0;
+  transparent_depth = 0.0;
+}