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Add macros for MMC3 four-screen nametables #211

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Sep 20, 2023
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Add macros for MMC3 four-screen nametables #211

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19 changes: 19 additions & 0 deletions mos-platform/nes-mmc3/bank.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,25 @@
extern "C" {
#endif

/**
* @brief Define this in a .c file to use standard 2-screen mirrored nametables.
* This is the default for MMC3.
*
* Use `MAPPER_USE_HORIZONTAL_MIRRORING` or `MAPPER_USE_VERTICAL_MIRRORING` to
* set the mirror direction.
*/
#define MAPPER_USE_MIRRORED_NAMETABLE \
asm(".global __four_screen\n __four_screen = 0\n")

/**
* @brief Define this in a .c file to use 4-screen mirroring, which uses 8 KiB
* of additional CHR-RAM to store the extra two nametables.
*
* Other mirroring flags are ignored when this is set.
*/
#define MAPPER_USE_4_SCREEN_NAMETABLE \
asm(".global __four_screen\n __four_screen = 1\n")

// Contains functions to help with working with multiple PRG/CHR banks
// For MMC3 code.

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