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, 9 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_toon.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_toon.glsl
new file mode 100644
index 00000000000..02d288d42bf
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_toon.glsl
@@ -0,0 +1,9 @@
+#ifndef VOLUMETRICS
+void node_bsdf_toon(vec4 color, float size, float tsmooth, vec3 N, out Closure result)
+{
+  node_bsdf_diffuse(color, 0.0, N, result);
+}
+#else
+/* Stub toon because it is not compatible with volumetrics. */
+#  define node_bsdf_toon
+#endif