GPU: Add glFlush and glFinish wrapper

source/blender/draw/engines/eevee/eevee_render.c

@@ -40,6 +40,7 @@
 
 #include "GPU_framebuffer.h"
 #include "GPU_glew.h"
+#include "GPU_state.h"
 
 #include "RE_pipeline.h"
 
@@ -551,7 +552,7 @@ void EEVEE_render_draw(EEVEE_Data *vedata, RenderEngine *engine, RenderLayer *rl
 		EEVEE_draw_effects(sldata, vedata);
 
 		/* XXX Seems to fix TDR issue with NVidia drivers on linux. */
-		glFinish();
+		GPU_finish();
 
 		RE_engine_update_progress(engine, (float)(render_samples++) / (float)tot_sample);
 	}

source/blender/gpu/GPU_state.h

@@ -61,4 +61,7 @@ void GPU_scissor_get_i(int coords[4]);
 void GPU_viewport_size_get_f(float coords[4]);
 void GPU_viewport_size_get_i(int coords[4]);
 
+void GPU_flush(void);
+void GPU_finish(void);
+
 #endif  /* __GPU_STATE_H__ */

source/blender/gpu/intern/gpu_state.c

@@ -160,3 +160,13 @@ void GPU_viewport_size_get_i(int coords[4])
 {
 	glGetIntegerv(GL_VIEWPORT, coords);
 }
+
+void GPU_flush(void)
+{
+	glFlush();
+}
+
+void GPU_finish(void)
+{
+	glFinish();
+}