EEVEE: GLSL refactor/cleanup

- add the use of DRWShaderLibrary to EEVEE's glsl codebase to reduce code
complexity and duplication.
- split bsdf_common_lib.glsl into multiple sub library which are now shared
with other engines.
- the surface shader code is now more organised and have its own files.
- change default world to use a material nodetree and make lookdev shader
more clear.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D8306

1 files changed, 46 insertions, 0 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/surface_geom.glsl b/source/blender/draw/engines/eevee/shaders/surface_geom.glsl
new file mode 100644
index 00000000000..ad437dca79a
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/surface_geom.glsl
@@ -0,0 +1,46 @@
+
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+#pragma BLENDER_REQUIRE(surface_lib.glsl)
+
+layout(triangles) in;
+layout(triangle_strip, max_vertices = 3) out;
+
+RESOURCE_ID_VARYING
+
+/* Only used to compute barycentric coordinates. */
+
+void main()
+{
+#ifdef DO_BARYCENTRIC_DISTANCES
+  dataAttrOut.barycentricDist = calc_barycentric_distances(
+      dataIn[0].worldPosition, dataIn[1].worldPosition, dataIn[2].worldPosition);
+#endif
+
+  PASS_RESOURCE_ID
+
+#ifdef USE_ATTR
+  pass_attr(0);
+#endif
+  PASS_SURFACE_INTERFACE(0);
+  gl_Position = gl_in[0].gl_Position;
+  gl_ClipDistance[0] = gl_in[0].gl_ClipDistance[0];
+  EmitVertex();
+
+#ifdef USE_ATTR
+  pass_attr(1);
+#endif
+  PASS_SURFACE_INTERFACE(1);
+  gl_Position = gl_in[1].gl_Position;
+  gl_ClipDistance[0] = gl_in[1].gl_ClipDistance[0];
+  EmitVertex();
+
+#ifdef USE_ATTR
+  pass_attr(2);
+#endif
+  PASS_SURFACE_INTERFACE(2);
+  gl_Position = gl_in[2].gl_Position;
+  gl_ClipDistance[0] = gl_in[2].gl_ClipDistance[0];
+  EmitVertex();
+
+  EndPrimitive();
+}