mirror of https://github.com/nmlgc/ReC98.git
43 lines
974 B
C
43 lines
974 B
C
// Alternate version that sets the value first
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#define OUTW2(port, val) __asm { \
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mov ax, val; \
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mov dx, port; \
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out dx, ax; \
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}
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void pascal egc_start_copy(void)
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{
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egc_on();
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OUTW2(EGC_ACTIVEPLANEREG, 0xFFF0);
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OUTW2(EGC_READPLANEREG, 0x00FF);
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// EGC_COMPAREREAD | EGC_WS_PATREG | EGC_RL_MEMREAD
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OUTW2(EGC_MODE_ROP_REG, 0x3100);
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OUTW2(EGC_MASKREG, 0xFFFF);
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OUTW2(EGC_ADDRRESSREG, 0);
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OUTW2(EGC_BITLENGTHREG, 0xF);
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}
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void egc_copy_rect_1_to_0(int x, int y, int w, int h)
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{
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register int x_end = x;
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register int x_floor = x_end;
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int row;
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int col;
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int row_p;
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dots16_t dots;
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int p;
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x_end += w;
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x_floor &= 0xFFF0;
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row_p = VRAM_OFFSET(x_floor, y);
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egc_start_copy();
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for(row = 0; row < h; row++) {
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for(col = x_floor, p = row_p; col < x_end; p += 2, col += 16) {
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graph_accesspage_func(1); VRAM_SNAP(dots, B, p, 16);
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graph_accesspage_func(0); VRAM_PUT(B, p, dots, 16);
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}
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row_p += 640 / 8;
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}
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egc_off();
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}
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