112 lines
4.8 KiB
C
112 lines
4.8 KiB
C
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#ifndef VIDEO_EGA_RENDER_REMAP_H
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# define VIDEO_EGA_RENDER_REMAP_H
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#define VAR_BYTE_MODE (0 << 0)
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#define VAR_WORD_MODE_MA13 (1 << 0)
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#define VAR_WORD_MODE_MA15 (2 << 0)
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#define VAR_DWORD_MODE (3 << 0)
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#define VAR_MODE_MASK (3 << 0)
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#define VAR_ROW0_MA13 (1 << 2)
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#define VAR_ROW1_MA14 (1 << 3)
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#define ADDRESS_REMAP_FUNC(nr) \
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static uint32_t address_remap_func_ ## nr(ega_t *ega, uint32_t in_addr) \
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{ \
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uint32_t out_addr; \
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\
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switch (nr & VAR_MODE_MASK) \
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{ \
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case VAR_BYTE_MODE: \
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out_addr = in_addr; \
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break; \
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\
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case VAR_WORD_MODE_MA13: \
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out_addr = ((in_addr << 1) & 0x1fff8) | \
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((in_addr >> 13) & 0x4) | \
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(in_addr & ~0x1ffff); \
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break; \
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\
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case VAR_WORD_MODE_MA15: \
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out_addr = ((in_addr << 1) & 0x1fff8) | \
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((in_addr >> 15) & 0x4) | \
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(in_addr & ~0x1ffff); \
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break; \
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\
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case VAR_DWORD_MODE: \
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out_addr = ((in_addr << 2) & 0x3fff0) | \
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((in_addr >> 14) & 0xc) | \
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(in_addr & ~0x3ffff); \
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break; \
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} \
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\
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if (nr & VAR_ROW0_MA13) \
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out_addr = (out_addr & ~0x8000) | \
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((ega->sc & 1) ? 0x8000 : 0); \
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if (nr & VAR_ROW1_MA14) \
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out_addr = (out_addr & ~0x10000) | \
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((ega->sc & 2) ? 0x10000 : 0); \
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\
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return out_addr; \
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}
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ADDRESS_REMAP_FUNC(0)
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ADDRESS_REMAP_FUNC(1)
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ADDRESS_REMAP_FUNC(2)
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ADDRESS_REMAP_FUNC(3)
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ADDRESS_REMAP_FUNC(4)
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ADDRESS_REMAP_FUNC(5)
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ADDRESS_REMAP_FUNC(6)
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ADDRESS_REMAP_FUNC(7)
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ADDRESS_REMAP_FUNC(8)
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ADDRESS_REMAP_FUNC(9)
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ADDRESS_REMAP_FUNC(10)
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ADDRESS_REMAP_FUNC(11)
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ADDRESS_REMAP_FUNC(12)
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ADDRESS_REMAP_FUNC(13)
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ADDRESS_REMAP_FUNC(14)
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ADDRESS_REMAP_FUNC(15)
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static uint32_t (*address_remap_funcs[16])(ega_t *ega, uint32_t in_addr) =
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{
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address_remap_func_0,
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address_remap_func_1,
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address_remap_func_2,
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address_remap_func_3,
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address_remap_func_4,
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address_remap_func_5,
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address_remap_func_6,
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address_remap_func_7,
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address_remap_func_8,
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address_remap_func_9,
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address_remap_func_10,
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address_remap_func_11,
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address_remap_func_12,
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address_remap_func_13,
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address_remap_func_14,
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address_remap_func_15
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};
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void ega_recalc_remap_func(ega_t *ega)
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{
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int func_nr;
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if (ega->crtc[0x14] & 0x40)
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func_nr = VAR_DWORD_MODE;
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else if (ega->crtc[0x17] & 0x40)
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func_nr = VAR_BYTE_MODE;
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else if (ega->crtc[0x17] & 0x20)
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func_nr = VAR_WORD_MODE_MA15;
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else
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func_nr = VAR_WORD_MODE_MA13;
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if (!(ega->crtc[0x17] & 0x01))
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func_nr |= VAR_ROW0_MA13;
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if (!(ega->crtc[0x17] & 0x02))
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func_nr |= VAR_ROW1_MA14;
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ega->remap_required = (func_nr != 0);
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ega->remap_func = address_remap_funcs[func_nr];
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}
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#endif /*VIDEO_RENDER_REMAP_H*/
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