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alter memory descriptors to accommodate bankswitched RAM size

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This commit is contained in:
Sven 2018-10-14 14:30:07 -04:00
parent dca7f55d4f
commit d6fd4f2a6f
2 changed files with 21 additions and 17 deletions
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19
libgambatte/libretro-common/include/libretro.h
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@ -1231,14 +1231,17 @@ struct retro_hw_render_context_negotiation_interface
* recognize or support. Should be set in either retro_init or retro_load_game, but not both.
*/
#define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */
#define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */
#define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
#define RETRO_MEMDESC_ALIGN_4 (2 << 16)
#define RETRO_MEMDESC_ALIGN_8 (3 << 16)
#define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */
#define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
#define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
#define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */
#define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */
#define RETRO_MEMDESC_SYSTEM_RAM (1 << 2) /* The memory area is system RAM. This is main RAM of the gaming system. */
#define RETRO_MEMDESC_SAVE_RAM (1 << 3) /* The memory area is save RAM. This RAM is usually found on a game cartridge, backed up by a battery. */
#define RETRO_MEMDESC_VIDEO_RAM (1 << 4) /* The memory area is video RAM (VRAM) */
#define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
#define RETRO_MEMDESC_ALIGN_4 (2 << 16)
#define RETRO_MEMDESC_ALIGN_8 (3 << 16)
#define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */
#define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
#define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
struct retro_memory_descriptor
{
uint64_t flags;

19
libgambatte/libretro/libretro.cpp
View File

@ -782,18 +782,19 @@ bool retro_load_game(const struct retro_game_info *info)
check_variables();
unsigned sramlen = gb.savedata_size();
const uint64_t rom = RETRO_MEMDESC_CONST;
const uint64_t rom = RETRO_MEMDESC_CONST;
const uint64_t mainram = RETRO_MEMDESC_SYSTEM_RAM;
struct retro_memory_descriptor descs[] =
{
{ 0, gb.zeropage_ptr(), 0, 0xFF80, 0, 0, 0x0080, NULL },
{ 0, gb.rambank0_ptr(), 0, 0xC000, 0, 0, 0x1000, NULL },
{ 0, gb.rambank1_ptr(), 0, 0xD000, 0, 0, 0x1000, NULL },
{ 0, gb.savedata_ptr(), 0, 0xA000, (size_t)~0x1FFF, 0, sramlen, NULL },
{ 0, gb.vram_ptr(), 0, 0x8000, 0, 0, 0x2000, NULL },
{ 0, gb.oamram_ptr(), 0, 0xFE00, 0, 0, 0x00A0, NULL },
{ rom, gb.rombank0_ptr(), 0, 0x0000, 0, 0, 0x4000, NULL },
{ rom, gb.rombank1_ptr(), 0, 0x4000, 0, 0, 0x4000, NULL },
{ mainram, gb.rambank0_ptr(), 0, 0xC000, 0, 0, 0x1000, NULL },
{ mainram, gb.rambank1_ptr(), 0, 0xD000, 0, 0, gb.isCgb() ? 0x7000 : 0x1000, NULL },
{ mainram, gb.zeropage_ptr(), 0, 0xFF80, 0, 0, 0x0080, NULL },
{ 0, gb.savedata_ptr(), 0, 0xA000, (size_t)~0x1FFF, 0, sramlen, NULL },
{ 0, gb.vram_ptr(), 0, 0x8000, 0, 0, 0x2000, NULL },
{ 0, gb.oamram_ptr(), 0, 0xFE00, 0, 0, 0x00A0, NULL },
{ rom, gb.rombank0_ptr(), 0, 0x0000, 0, 0, 0x4000, NULL },
{ rom, gb.rombank1_ptr(), 0, 0x4000, 0, 0, 0x4000, NULL },
};
struct retro_memory_map mmaps =