Liquid Simulation Display Options (GSoC 2020)

All the changes made in the branch `soc-2020-fluid-tools` are included in this patch.

**Major changes:**

=== Viewport Display ===

- //Raw voxel display// or //closest (nearest-neighbor)// interpolation for displaying the underlying voxel data of the simulation grids more clearly.
- An option to display //gridlines// when the slicing method is //single//.

==== Grid Display ====

- Visualization for flags, pressure and level-set representation grids with a fixed color coding based on Manta GUI.

==== Vector Display ====

- //**M**arker **A**nd **C**ell// grid visualization options for vector grids like velocity or external forces.
- Made vector display options available for external forces.

==== Coloring options for //gridlines// ====

- Range highlighting and cell filtering options for displaying the simulation grid data more precisely.
- Color gridlines with flags.

- Also, made slicing and interpolation options available for Volume Object.

Reviewed By: JacquesLucke, sebbas

Differential Revision: https://developer.blender.org/D8705

1 files changed, 47 insertions, 16 deletions

diff --git a/source/blender/draw/tests/shaders_test.cc b/source/blender/draw/tests/shaders_test.cc
index f99fa04ce75..cb9a572eadf 100644
--- a/source/blender/draw/tests/shaders_test.cc
+++ b/source/blender/draw/tests/shaders_test.cc
@@ -97,22 +97,53 @@ TEST_F(DrawTest, workbench_glsl_shaders)
   EXPECT_NE(workbench_shader_antialiasing_get(1), nullptr);
   EXPECT_NE(workbench_shader_antialiasing_get(2), nullptr);
 
-  EXPECT_NE(workbench_shader_volume_get(false, false, false, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, false, false, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, false, true, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, false, true, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, true, false, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, true, false, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, true, true, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(false, true, true, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, false, false, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, false, false, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, false, true, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, false, true, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, true, false, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, true, false, true), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, true, true, false), nullptr);
-  EXPECT_NE(workbench_shader_volume_get(true, true, true, true), nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, false, WORKBENCH_VOLUME_INTERP_LINEAR, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, false, WORKBENCH_VOLUME_INTERP_LINEAR, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, false, WORKBENCH_VOLUME_INTERP_CUBIC, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, false, WORKBENCH_VOLUME_INTERP_CUBIC, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, false, WORKBENCH_VOLUME_INTERP_CLOSEST, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, false, WORKBENCH_VOLUME_INTERP_CLOSEST, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, true, WORKBENCH_VOLUME_INTERP_LINEAR, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, true, WORKBENCH_VOLUME_INTERP_LINEAR, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, true, WORKBENCH_VOLUME_INTERP_CUBIC, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, true, WORKBENCH_VOLUME_INTERP_CUBIC, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, true, WORKBENCH_VOLUME_INTERP_CLOSEST, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(false, true, WORKBENCH_VOLUME_INTERP_CLOSEST, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, false, WORKBENCH_VOLUME_INTERP_LINEAR, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, false, WORKBENCH_VOLUME_INTERP_LINEAR, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, false, WORKBENCH_VOLUME_INTERP_CUBIC, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, false, WORKBENCH_VOLUME_INTERP_CUBIC, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, false, WORKBENCH_VOLUME_INTERP_CLOSEST, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, false, WORKBENCH_VOLUME_INTERP_CLOSEST, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, true, WORKBENCH_VOLUME_INTERP_LINEAR, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, true, WORKBENCH_VOLUME_INTERP_LINEAR, true),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, true, WORKBENCH_VOLUME_INTERP_CUBIC, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, true, WORKBENCH_VOLUME_INTERP_CUBIC, true), nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, true, WORKBENCH_VOLUME_INTERP_CLOSEST, false),
+            nullptr);
+  EXPECT_NE(workbench_shader_volume_get(true, true, WORKBENCH_VOLUME_INTERP_CLOSEST, true),
+            nullptr);
 
   GPUShader *dof_prepare_sh;
   GPUShader *dof_downsample_sh;