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Add palette conversion routine for non-R2 MIPS 

Gated MIPS_HAS_R2_INSTS not used at the moment. Tested with qemu.
This commit is contained in:
David Guillen Fandos 2021-07-01 12:04:48 +02:00
parent 836e51b694
commit 3d874ec5e3
1 changed files with 21 additions and 7 deletions
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28
psp/mips_emit.h
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@ -2969,19 +2969,33 @@ static void emit_pmemst_stub(
*tr_ptr = translation_ptr;
}
// Palette conversion functions. a1 contains the palette value (16 LSB)
// Places the result in reg_temp, can use a0 as temporary register
#ifdef USE_BGR_FORMAT
/* 0BGR to BGR565, for PSP */
/* 0BGR to BGR565, only for PSP (uses ins) */
#define palette_convert() \
mips_emit_sll(reg_temp, reg_a1, 1); \
mips_emit_andi(reg_temp, reg_temp, 0xFFC0); \
mips_emit_ins(reg_temp, reg_a1, 0, 5);
#else
/* 0BGR to RGB565 (clobbers a0!) */
#define palette_convert() \
mips_emit_ext(reg_temp, reg_a1, 10, 5); \
mips_emit_ins(reg_temp, reg_a1, 11, 5); \
mips_emit_ext(reg_a0, reg_a1, 5, 5); \
mips_emit_ins(reg_temp, reg_a0, 6, 5);
/* 0BGR to RGB565 (clobbers a0) */
#ifdef MIPS_HAS_R2_INSTS
#define palette_convert() \
mips_emit_ext(reg_temp, reg_a1, 10, 5); \
mips_emit_ins(reg_temp, reg_a1, 11, 5); \
mips_emit_ext(reg_a0, reg_a1, 5, 5); \
mips_emit_ins(reg_temp, reg_a0, 6, 5);
#else
#define palette_convert() \
mips_emit_srl(reg_a0, reg_a1, 10); \
mips_emit_andi(reg_temp, reg_a0, 0x1F); \
mips_emit_sll(reg_a0, reg_a1, 1); \
mips_emit_andi(reg_a0, reg_a0, 0x7C0); \
mips_emit_or(reg_temp, reg_temp, reg_a0); \
mips_emit_andi(reg_a0, reg_a1, 0x1F); \
mips_emit_sll(reg_a0, reg_a0, 11); \
mips_emit_or(reg_temp, reg_temp, reg_a0);
#endif
#endif
// Palette is accessed differently and stored in a decoded manner