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, 46 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_geometry.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_geometry.glsl
new file mode 100644
index 00000000000..79614495499
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_geometry.glsl
@@ -0,0 +1,46 @@
+void node_geometry(vec3 I,
+                   vec3 N,
+                   vec3 orco,
+                   mat4 objmat,
+                   mat4 toworld,
+                   vec2 barycentric,
+                   out vec3 position,
+                   out vec3 normal,
+                   out vec3 tangent,
+                   out vec3 true_normal,
+                   out vec3 incoming,
+                   out vec3 parametric,
+                   out float backfacing,
+                   out float pointiness)
+{
+  /* handle perspective/orthographic */
+  vec3 I_view = (ProjectionMatrix[3][3] == 0.0) ? normalize(I) : vec3(0.0, 0.0, -1.0);
+  incoming = -(toworld * vec4(I_view, 0.0)).xyz;
+
+#if defined(WORLD_BACKGROUND) || defined(PROBE_CAPTURE)
+  position = -incoming;
+  true_normal = normal = incoming;
+  tangent = parametric = vec3(0.0);
+  vec3(0.0);
+  backfacing = 0.0;
+  pointiness = 0.0;
+#else
+
+  position = worldPosition;
+#  ifndef VOLUMETRICS
+  normal = normalize(N);
+  vec3 B = dFdx(worldPosition);
+  vec3 T = dFdy(worldPosition);
+  true_normal = normalize(cross(B, T));
+#  else
+  normal = (toworld * vec4(N, 0.0)).xyz;
+  true_normal = normal;
+#  endif
+  tangent_orco_z(orco, orco);
+  node_tangent(N, orco, objmat, tangent);
+
+  parametric = vec3(barycentric, 0.0);
+  backfacing = (gl_FrontFacing) ? 0.0 : 1.0;
+  pointiness = 0.5;
+#endif
+}