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, 42 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_tex_wave.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_tex_wave.glsl
new file mode 100644
index 00000000000..2196848a4ef
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_tex_wave.glsl
@@ -0,0 +1,42 @@
+float calc_wave(
+    vec3 p, float distortion, float detail, float detail_scale, int wave_type, int wave_profile)
+{
+  float n;
+
+  if (wave_type == 0) { /* type bands */
+    n = (p.x + p.y + p.z) * 10.0;
+  }
+  else { /* type rings */
+    n = length(p) * 20.0;
+  }
+
+  if (distortion != 0.0) {
+    n += distortion * noise_turbulence(p * detail_scale, detail, 0);
+  }
+
+  if (wave_profile == 0) { /* profile sin */
+    return 0.5 + 0.5 * sin(n);
+  }
+  else { /* profile saw */
+    n /= 2.0 * M_PI;
+    n -= int(n);
+    return (n < 0.0) ? n + 1.0 : n;
+  }
+}
+
+void node_tex_wave(vec3 co,
+                   float scale,
+                   float distortion,
+                   float detail,
+                   float detail_scale,
+                   float wave_type,
+                   float wave_profile,
+                   out vec4 color,
+                   out float fac)
+{
+  float f;
+  f = calc_wave(co * scale, distortion, detail, detail_scale, int(wave_type), int(wave_profile));
+
+  color = vec4(f, f, f, 1.0);
+  fac = f;
+}