DrawEngine: Shader Test Suite

A test case that compiles all the GLSL shaders for workbench, gpencil, overlay and some
of eevee. Compilation is still platform dependent, but when run on a test-farm
with different hardware we will be able to detect GLSL compilation
errors early on.

The test will be compiled when `WITH_GTEST` and `WITH_OPENGL_DRAW_TESTS`
are On.

For eevee only the shaders inside eevee_shaders.c are included. EEVEE has some shaders
located inside the submodule. They aren't accessible to the outside and aren't added
to the test case. We should see how we want to add them. For the test cases it is better
to move them to eevee_shaders.c, but for eevee perspective it is better to keep them in
the submodule. Keeping them in the submodule could lead to situations that is harder to test.
as the shader could already have been initialized.

Reviewed By: Clément Foucault

Differential Revision: https://developer.blender.org/D8667

4 files changed, 34 insertions, 1 deletions

diff --git a/source/blender/draw/engines/eevee/eevee_private.h b/source/blender/draw/engines/eevee/eevee_private.h
index 9cde9e871e5..b25f21ce929 100644
--- a/source/blender/draw/engines/eevee/eevee_private.h
+++ b/source/blender/draw/engines/eevee/eevee_private.h
@@ -32,6 +32,10 @@
 
 #include "BKE_camera.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct EEVEE_ShadowCasterBuffer;
 struct GPUFrameBuffer;
 struct Object;
@@ -1363,3 +1367,7 @@ static const float cubefacemat[6][4][4] = {
      {0.0f, 0.0f, 1.0f, 0.0f},
      {0.0f, 0.0f, 0.0f, 1.0f}},
 };
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/source/blender/draw/engines/gpencil/gpencil_engine.h b/source/blender/draw/engines/gpencil/gpencil_engine.h
index 34d4488d066..852945b25c3 100644
--- a/source/blender/draw/engines/gpencil/gpencil_engine.h
+++ b/source/blender/draw/engines/gpencil/gpencil_engine.h
@@ -24,10 +24,16 @@
 
 #include "DNA_gpencil_types.h"
 
+#include "DRW_render.h"
+
 #include "BLI_bitmap.h"
 
 #include "GPU_batch.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern DrawEngineType draw_engine_gpencil_type;
 
 struct GPENCIL_Data;
@@ -397,7 +403,6 @@ void gpencil_vfx_cache_populate(GPENCIL_Data *vedata, Object *ob, GPENCIL_tObjec
 /* Shaders */
 struct GPUShader *GPENCIL_shader_antialiasing(int stage);
 struct GPUShader *GPENCIL_shader_geometry_get(void);
-struct GPUShader *GPENCIL_shader_composite_get(void);
 struct GPUShader *GPENCIL_shader_layer_blend_get(void);
 struct GPUShader *GPENCIL_shader_mask_invert_get(void);
 struct GPUShader *GPENCIL_shader_depth_merge_get(void);
@@ -438,3 +443,6 @@ void GPENCIL_render_to_image(void *vedata,
 void gpencil_light_pool_free(void *storage);
 void gpencil_material_pool_free(void *storage);
 GPENCIL_ViewLayerData *GPENCIL_view_layer_data_ensure(void);
+#ifdef __cplusplus
+}
+#endif
diff --git a/source/blender/draw/engines/overlay/overlay_private.h b/source/blender/draw/engines/overlay/overlay_private.h
index 7e93382796f..c9d29af91e6 100644
--- a/source/blender/draw/engines/overlay/overlay_private.h
+++ b/source/blender/draw/engines/overlay/overlay_private.h
@@ -22,6 +22,12 @@
 
 #pragma once
 
+#include "DRW_render.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifdef __APPLE__
 #  define USE_GEOM_SHADER_WORKAROUND 1
 #else
@@ -627,3 +633,7 @@ GPUShader *OVERLAY_shader_xray_fade(void);
 OVERLAY_InstanceFormats *OVERLAY_shader_instance_formats_get(void);
 
 void OVERLAY_shader_free(void);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/source/blender/draw/engines/workbench/workbench_private.h b/source/blender/draw/engines/workbench/workbench_private.h
index 12e573a02d0..8983826f16f 100644
--- a/source/blender/draw/engines/workbench/workbench_private.h
+++ b/source/blender/draw/engines/workbench/workbench_private.h
@@ -33,6 +33,10 @@
 
 #include "workbench_engine.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 extern struct DrawEngineType draw_engine_workbench;
 
 #define WORKBENCH_ENGINE "BLENDER_WORKBENCH"
@@ -519,3 +523,6 @@ void workbench_render(void *ved,
 void workbench_render_update_passes(struct RenderEngine *engine,
                                     struct Scene *scene,
                                     struct ViewLayer *view_layer);
+#ifdef __cplusplus
+}
+#endif