GLSL: added an option to disable row-major-load workaround.

2 files changed, 7 insertions, 1 deletions

diff --git a/spirv_glsl.cpp b/spirv_glsl.cpp
index 1b679fc9..0a723708 100644
--- a/spirv_glsl.cpp
+++ b/spirv_glsl.cpp
@@ -649,7 +649,7 @@ string CompilerGLSL::compile()
 	{
 		// only NV_gpu_shader5 supports divergent indexing on OpenGL, and it does so without extra qualifiers
 		backend.nonuniform_qualifier = "";
-		backend.needs_row_major_load_workaround = !options.es;
+		backend.needs_row_major_load_workaround = options.enable_row_major_load_workaround;
 	}
 	backend.allow_precision_qualifiers = options.vulkan_semantics || options.es;
 	backend.force_gl_in_out_block = true;
diff --git a/spirv_glsl.hpp b/spirv_glsl.hpp
index a798737c..d967b456 100644
--- a/spirv_glsl.hpp
+++ b/spirv_glsl.hpp
@@ -145,6 +145,12 @@ public:
 		// compares.
 		bool relax_nan_checks = false;
 
+		// Loading row-major matrices from UBOs on older AMD Windows OpenGL drivers is problematic.
+		// To load these types correctly, we must generate a wrapper. them in a dummy function which only purpose is to
+		// ensure row_major decoration is actually respected.
+		// This workaround may cause significant performance degeneration on some Android devices.
+		bool enable_row_major_load_workaround = true;
+
 		// If non-zero, controls layout(num_views = N) in; in GL_OVR_multiview2.
 		uint32_t ovr_multiview_view_count = 0;