gpu-next: Redefinition of //!TYPE ENUM

Important Information

https://github.com/shinchiro/mpv-winbuild-cmake/releases/tag/20230808

Reproduction steps

//!PARAM FROM
//!TYPE ENUM DEFINE
BT2020
BT709

//!PARAM TO
//!TYPE ENUM DEFINE
BT709
BT2020

Expected behavior

become to:

#define     FROM_BT2020     0
#define     FROM_BT709      1
#define     FROM            FROM_BT2020
#define     FROM_raw        BT2020

#define     TO_BT709        0
#define     TO_BT2020       1
#define     TO              TO_BT709
#define     TO_raw          BT709

Imagine we have a placeboFX, including a color space transform GUI panel, from and to select boxes will use the same list. So, add a prefix to solve redefinition.

And if it's possible, add PRAMA_raw will give me ability to use it as original code (https://github.com/mpv-player/mpv/issues/12093) without #if.

//!PARAM FROM
//!TYPE ENUM DEFINE
UNSET
BT2020
BT709

//!PARAM TO
//!TYPE ENUM DEFINE
UNSET
BT2020
BT709

//!HOOK OUTPUT
//!BIND HOOKED
//!WHEN FROM TO - FROM TO + 0 = +
//!DESC csp

#define from    FROM ? FROM_raw : BT2020
#define to      TO   ? TO_raw   : BT709

...

Actual behavior

They got become to:

#define FROM   0
#define BT2020 0
#define BT709  1

#define TO     0
#define BT709  0
#define BT2020 1

Log file

Sample files

Start by tracing gpu-next handling of //!PARAM with //!TYPE ENUM DEFINE, using the reproduction as the minimal case. Compare the generated defines with the expected prefixed and *_raw forms; done means FROM and TO no longer redefine shared enum names while preserving access to the original values.