Fix crash when editing shaders on Intel HD 4000.

In the Intel HD 4000 driver a shader has to be deleted in the same context in which it is created.
However, because you can't use a rendering context on different threads, to maintain the multithreaded compilation, the solution was to use the `GL_ARB_get_program_binary` and copy the binary generated for the shader and generate a shader on the main context using that binary.
This solution is limited only to Intel HD 4000 and windows.

Reviewers: fclem

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D5019

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_extensions.h b/source/blender/gpu/GPU_extensions.h
index 8f602bf1398..d0abf671fcd 100644
--- a/source/blender/gpu/GPU_extensions.h
+++ b/source/blender/gpu/GPU_extensions.h
@@ -46,6 +46,7 @@ void GPU_get_dfdy_factors(float fac[2]);
 bool GPU_mip_render_workaround(void);
 bool GPU_depth_blitting_workaround(void);
 bool GPU_unused_fb_slot_workaround(void);
+bool GPU_context_local_shaders_workaround(void);
 bool GPU_crappy_amd_driver(void);
 
 bool GPU_mem_stats_supported(void);