mirror of https://github.com/nmlgc/ReC98.git
59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
/* ReC98
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* -----
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* Main include file
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*/
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#include <master.h>
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// Macros
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// ------
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#define CLAMP_INC(val, max) \
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(val)++; \
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if((val) > (max)) { \
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(val) = (max); \
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}
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#define CLAMP_DEC(val, min) \
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(val)--; \
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if((val) < (min)) { \
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(val) = (min); \
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}
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#define RING_INC(val, ring_end) \
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(val)++; \
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if((val) > (ring_end)) { \
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(val) = 0; \
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}
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#define RING_DEC(val, ring_end) \
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(val)--; \
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if((val) < 0) { \
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(val) = ring_end; \
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}
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// ------
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// PC-98 VRAM planes
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// -----------------
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typedef enum {
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PL_B, PL_R, PL_G, PL_E, PL_COUNT
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} vram_plane_t;
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// Since array subscripts create slightly different assembly in places, we
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// offer both variants.
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extern char *VRAM_PLANE[PL_COUNT];
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extern char *VRAM_PLANE_B;
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extern char *VRAM_PLANE_G;
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extern char *VRAM_PLANE_R;
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extern char *VRAM_PLANE_E;
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// Parenthesizing it like this avoids a signed 16-bit overflow.
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#define PLANE_SIZE (640 * (400 / 8))
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#define PLANE_DWORD_BLIT(dst, src) \
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for(p = 0; p < PLANE_SIZE; p += 4) { \
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*(long*)((dst) + p) = *(long*)((src) + p); \
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}
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#define VRAM_OFFSET(x, y) ((x) >> 3) + (y << 6) + (y << 4)
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// -----------------
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