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, 28 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_color_ramp.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_color_ramp.glsl
new file mode 100644
index 00000000000..9fe45f91f45
--- /dev/null
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_color_ramp.glsl
@@ -0,0 +1,28 @@
+void valtorgb_opti_constant(
+    float fac, float edge, vec4 color1, vec4 color2, out vec4 outcol, out float outalpha)
+{
+  outcol = (fac > edge) ? color2 : color1;
+  outalpha = outcol.a;
+}
+
+void valtorgb_opti_linear(
+    float fac, vec2 mulbias, vec4 color1, vec4 color2, out vec4 outcol, out float outalpha)
+{
+  fac = clamp(fac * mulbias.x + mulbias.y, 0.0, 1.0);
+  outcol = mix(color1, color2, fac);
+  outalpha = outcol.a;
+}
+
+void valtorgb(float fac, sampler1DArray colormap, float layer, out vec4 outcol, out float outalpha)
+{
+  outcol = texture(colormap, vec2(fac, layer));
+  outalpha = outcol.a;
+}
+
+void valtorgb_nearest(
+    float fac, sampler1DArray colormap, float layer, out vec4 outcol, out float outalpha)
+{
+  fac = clamp(fac, 0.0, 1.0);
+  outcol = texelFetch(colormap, ivec2(fac * (textureSize(colormap, 0).x - 1), layer), 0);
+  outalpha = outcol.a;
+}