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, 22 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_normal_map.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_normal_map.glsl
new file mode 100644
index 00000000000..6930e0c5dad
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_normal_map.glsl
@@ -0,0 +1,22 @@
+void node_normal_map(vec4 info, vec4 tangent, vec3 normal, vec3 texnormal, out vec3 outnormal)
+{
+  if (all(equal(tangent, vec4(0.0, 0.0, 0.0, 1.0)))) {
+    outnormal = normal;
+    return;
+  }
+  tangent *= (gl_FrontFacing ? 1.0 : -1.0);
+  vec3 B = tangent.w * cross(normal, tangent.xyz) * info.w;
+
+  outnormal = texnormal.x * tangent.xyz + texnormal.y * B + texnormal.z * normal;
+  outnormal = normalize(outnormal);
+}
+
+void color_to_normal_new_shading(vec3 color, out vec3 normal)
+{
+  normal = vec3(2.0) * color - vec3(1.0);
+}
+
+void color_to_blender_normal_new_shading(vec3 color, out vec3 normal)
+{
+  normal = vec3(2.0, -2.0, -2.0) * color - vec3(1.0);
+}