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, 3 insertions, 2 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/btdf_lut_frag.glsl b/source/blender/draw/engines/eevee/shaders/btdf_lut_frag.glsl
index 1389a9763c0..d815d9d4e6b 100644
--- a/source/blender/draw/engines/eevee/shaders/btdf_lut_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/btdf_lut_frag.glsl
@@ -1,3 +1,4 @@
+#pragma BLENDER_REQUIRE(bsdf_sampling_lib.glsl)
 
 uniform float a2;
 
@@ -7,8 +8,8 @@ void main()
 {
   vec3 N, T, B, V;
 
-  float x = gl_FragCoord.x / BRDF_LUT_SIZE;
-  float y = gl_FragCoord.y / BRDF_LUT_SIZE;
+  float x = gl_FragCoord.x / LUT_SIZE;
+  float y = gl_FragCoord.y / LUT_SIZE;
   /* There is little variation if ior > 1.0 so we
    * maximize LUT precision for ior < 1.0 */
   x = x * 1.1;