I'd like to declare GLSL shader strings inline using macro stringification:
#define STRINGIFY(A) #A
const GLchar* vert = STRINGIFY(
#version 120\n
attribute vec2 position;
void main()
{
gl_Position = vec4( position, 0.0, 1.0 );
}
);
This builds and runs fine using VS2010 but fails to compile on gcc
with:
error: invalid preprocessing directive #version
Is there a way to use stringification like this in a portable manner?
I'm trying to avoid per-line quotes:
const GLchar* vert =
"#version 120\n"
"attribute vec2 position;"
"void main()"
"{"
" gl_Position = vec4( position, 0.0, 1.0 );"
"}"
;
...and/or line continuation:
const GLchar* vert = "\
#version 120\n \
attribute vec2 position; \
void main() \
{ \
gl_Position = vec4( position, 0.0, 1.0 ); \
} \
";
Can you use C++11? If so you could use raw string literals:
const GLchar* vert = R"END(
#version 120
attribute vec2 position;
void main()
{
gl_Position = vec4( position, 0.0, 1.0 );
}
)END";
No need for escapes or explicit newlines. These strings start with an R (or r). You need a delimiter (I chose END) between the quote and the first parenthesis to escape parenthesis which you have in the code snippet.