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, 31 insertions, 0 deletions

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_effect_cavity_frag.glsl b/source/blender/draw/engines/workbench/shaders/workbench_effect_cavity_frag.glsl
new file mode 100644
index 00000000000..328d50e69e0
--- /dev/null
+++ b/source/blender/draw/engines/workbench/shaders/workbench_effect_cavity_frag.glsl
@@ -0,0 +1,31 @@
+
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+#pragma BLENDER_REQUIRE(workbench_common_lib.glsl)
+#pragma BLENDER_REQUIRE(workbench_cavity_lib.glsl)
+#pragma BLENDER_REQUIRE(workbench_curvature_lib.glsl)
+
+uniform sampler2D depthBuffer;
+uniform sampler2D normalBuffer;
+uniform usampler2D objectIdBuffer;
+
+in vec4 uvcoordsvar;
+
+out vec4 fragColor;
+
+void main()
+{
+  float cavity = 0.0, edges = 0.0, curvature = 0.0;
+
+#ifdef USE_CAVITY
+  cavity_compute(uvcoordsvar.st, depthBuffer, normalBuffer, cavity, edges);
+#endif
+
+#ifdef USE_CURVATURE
+  curvature_compute(uvcoordsvar.st, objectIdBuffer, normalBuffer, curvature);
+#endif
+
+  float final_cavity_factor = clamp((1.0 - cavity) * (1.0 + edges) * (1.0 + curvature), 0.0, 4.0);
+
+  fragColor.rgb = vec3(final_cavity_factor);
+  fragColor.a = 1.0;
+}