Workbench Simplification Refactor

This patch is (almost) a complete rewrite of workbench engine.
The features remain unchanged but the code quality is greatly improved.
Hair shading is brighter but also more correct.

This also introduce the concept of `DRWShaderLibrary` to make a simple
include system inside the GLSL files.

Differential Revision: https://developer.blender.org/D7060

1 files changed, 21 insertions, 0 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_shader_interface_lib.glsl b/source/blender/draw/engines/workbench/shaders/workbench_shader_interface_lib.glsl
new file mode 100644
index 00000000000..8e2f7ba4735
--- /dev/null
+++ b/source/blender/draw/engines/workbench/shaders/workbench_shader_interface_lib.glsl
@@ -0,0 +1,21 @@
+
+#ifdef GPU_VERTEX_SHADER
+#  define IN_OUT out
+#else
+#  define IN_OUT in
+#endif
+
+IN_OUT ShaderStageInterface
+{
+  vec3 normal_interp;
+  vec3 color_interp;
+  float alpha_interp;
+  vec2 uv_interp;
+#ifdef TRANSPARENT_MATERIAL
+  flat float roughness;
+  flat float metallic;
+#else
+  flat float packed_rough_metal;
+#endif
+  flat int object_id;
+};