feat: replace triangle test by cube

CMakeLists.txt

@@ -40,11 +40,11 @@ foreach(SHADER ${SHADERS})
   add_custom_command(
     OUTPUT ${OUTPUT_C}
     COMMAND python3
-    ${CMAKE_SOURCE_DIR}/glsl2c.py
+    ${CMAKE_SOURCE_DIR}/scripts/glsl2c.py
     ${SHADER}
     ${OUTPUT_C}
     DEPENDS ${SHADER}
-    ${CMAKE_SOURCE_DIR}/glsl2c.py
+    ${CMAKE_SOURCE_DIR}/scripts/glsl2c.py
     COMMENT "Converting shader ${NAME_WE}${EXT} to C file"
     VERBATIM
   )