[SEGA] DGEN 1.31.x 271112

Altered Beast (SEGA Enterprises Ltd., 1990)

Author: zamaz <zamaz@users.sourceforge.net> Date:   Mon Nov 26 22:51:05 2012 +0100

• sdl: fix OpenGL texture type for 32bpp on big endian machines
• On big endian machines, the 32bpp texture type used by default is reversed, requiring bool_swab to be enabled. The 16bpp texture type doesn't have this problem. It's annoying, so this commit replaces the default GL_UNSIGNED_BYTE type with GL_UNSIGNED_INT_8_8_8_8_REV on big endian machines. Bug: 3588431

Author: zamaz <zamaz@users.sourceforge.net> Date:   Sun Nov 25 22:19:18 2012 +0100

• gamepad: fix 6-button pad emulation
• DGen/SDL has always emulated 6-button pads, but some code originally present in DGen (Win32 version) was missing. Most games didn't care about this and were in 3-button mode as a result, however some of them weren't working correctly (no input at all).

Author: zamaz <zamaz@users.sourceforge.net> Date:   Sun Nov 25 21:55:21 2012 +0100

• gamepad: initialize with MD_PAD_UNTOUCHED 
• This macro replaces all occurences of the 0xf303f constant used to  initialize gamepads.

Author: zamaz <zamaz@users.sourceforge.net> Date:   Sun Nov 25 21:02:46 2012 +0100

• debug: disassembler-related fixes
• When hitting a breakpoint, the displayed instruction was the next instruction, not the current one (M68K_REG_PC -> M68K_REG_PPC).
• The disassembler assumed instructions were always 4 bytes long, which isn't the case on the M68K. Use the returned value from  m68k_disassemble() instead.
• Due to the above, hexadecimal dump has been removed because there was no way to align it nicely. Users can use the "mem" command for this.
• Increased the default number of instructions displayed by "dis" from 8 to 16.
• Many instructions cannot be displayed correctly in pure 68000 mode. Replaced M68K_CPU_TYPE_68000 with M68K_CPU_TYPE_68040 for  m68k_disassemble().
• Updated help string to match for the actual behavior of "dis <addr>".