mupen64plus-libretro: crash on Mali GPU (Android)

Hi,
I found mupen64plus core run ok on GPU Adreno, but crash on GPU Mali-450, Mali-400, Mali-300.

Here is a error log from a Mali-450 device:
11-15 18:34:59.933: I/RetroArch(23778): Environ GET_VARIABLE mupen64-filtering:
11-15 18:34:59.933: I/RetroArch(23778): automatic
11-15 18:34:59.933: I/RetroArch(23778): Environ GET_VARIABLE mupen64-filtering:
11-15 18:34:59.933: I/RetroArch(23778): automatic
11-15 18:34:59.943: I/RetroArch[libretro INFO] ::(23778): Detected RDRAM size: 007fffff
11-15 18:34:59.943: I/RetroArch(23778): Environ GET_VARIABLE mupen64-screensize:
11-15 18:34:59.943: I/RetroArch(23778): 640x480
11-15 18:34:59.943: I/RetroArch[libretro INFO] ::(23778): GL_RENDERER: Mali-450 MP
11-15 18:34:59.943: E/RetroArch[libretro ERROR] ::(23778): 0:20: P0004: High precision not supported, instead compiling high precision as medium precision
11-15 18:34:59.943: E/RetroArch[libretro ERROR] ::(23778): 0:30: L0002: Undeclared variable 'gl_FragDepth'
11-15 18:34:59.943: A/libc(23778): Fatal signal 11 (SIGSEGV) at 0x0000004a (code=1), thread 23855 (com.retroarch)

For comparison, here is a ok log from a Adreno-320 device:
11-15 18:02:01.119: I/RetroArch:(28458): Environ GET_VARIABLE mupen64-filtering:
11-15 18:02:01.119: I/RetroArch:(28458): automatic
11-15 18:02:01.119: I/RetroArch:(28458): Environ GET_VARIABLE mupen64-filtering:
11-15 18:02:01.119: I/RetroArch:(28458): automatic
11-15 18:02:01.119: I/RetroArch: [libretro INFO] ::(28458): Detected RDRAM size: 007fffff
11-15 18:02:01.119: I/RetroArch:(28458): Environ GET_VARIABLE mupen64-screensize:
11-15 18:02:01.119: I/RetroArch:(28458): 640x480
11-15 18:02:01.119: I/RetroArch: [libretro INFO] ::(28458): GL_RENDERER: Adreno (TM) 320
11-15 18:02:01.159: I/RetroArch: [libretro INFO] ::(28458): mupen64plus: Starting R4300 emulator: Dynamic Recompiler
11-15 18:02:01.159: I/RetroArch: [libretro INFO] ::(28458): mupen64plus: Init new dynarec
11-15 18:02:01.159: I/RetroArch: [libretro INFO] ::(28458): mupen64plus: 32MB cache initialised at: 7B335000
11-15 18:02:01.199: I/RetroArch:(28458): Environ GET_VARIABLE mupen64-disableexpmem:
11-15 18:02:01.199: I/RetroArch:(28458): no

It seems that the crash happen on GL_RENDERER.

Start by reproducing the crash on a Mali-450, Mali-400, or Mali-300 Android device and compare the provided logs with the Adreno-320 log. Investigate the shader compilation errors, especially the undeclared gl_FragDepth message, and the point where execution stops after GL_RENDERER is reported. Done means the cause is identified and the core no longer crashes on the affected Mali GPUs.