GPUShader: Add GLSL source modification pass to support enums

This uses a light parser / string modification pass to convert
C++ enum declaration syntax to GLSL compatible one.

GLSL having no support for enums, we are forced to convert the
enum values to a series of constant uints.

The parser (not really one by the way), being stupidly simple,
will not change anything to the values and thus make some C++
syntax (like omitting the values) not work.

The string replacement happens on all GLSL files on startup.
I did not measure significant changes in blender startup speed.
There is plans to do all of this at compile time.

We limit the scope of the search to `.h` and `.hh` files to prevent
confusing syntax in `.glsl` files.

There is basic error reporting with file, line and char logging
for easy debuggabiliy.

The requirements to use this enum sharing system are already listed in
`gpu_shader_shared_utils.h` and repeated on top of the preprocessor
function.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/gpu/CMakeLists.txt b/source/blender/gpu/CMakeLists.txt
index c898392dc7e..49b6b478148 100644
--- a/source/blender/gpu/CMakeLists.txt
+++ b/source/blender/gpu/CMakeLists.txt
@@ -393,7 +393,7 @@ set(GLSL_SOURCE_CONTENT "")
 foreach(GLSL_FILE ${GLSL_SRC})
   get_filename_component(GLSL_FILE_NAME ${GLSL_FILE} NAME)
   string(REPLACE "." "_" GLSL_FILE_NAME_UNDERSCORES ${GLSL_FILE_NAME})
-  string(APPEND GLSL_SOURCE_CONTENT "SHADER_SOURCE\(datatoc_${GLSL_FILE_NAME_UNDERSCORES}, \"${GLSL_FILE_NAME}\"\)\n")
+  string(APPEND GLSL_SOURCE_CONTENT "SHADER_SOURCE\(datatoc_${GLSL_FILE_NAME_UNDERSCORES}, \"${GLSL_FILE_NAME}\", \"${GLSL_FILE}\"\)\n")
 endforeach()
 
 set(glsl_source_list_file "${CMAKE_CURRENT_BINARY_DIR}/glsl_gpu_source_list.h")