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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 162 | giacomo | 1 | /* VGAlib version 1.2 - (c) 1993 Tommy Frandsen */ |
| 2 | /* */ |
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| 3 | /* This library is free software; you can redistribute it and/or */ |
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| 4 | /* modify it without any restrictions. This library is distributed */ |
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| 5 | /* in the hope that it will be useful, but without any warranty. */ |
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| 6 | |||
| 7 | /* Multi-chipset support Copyright 1993 Harm Hanemaayer */ |
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| 8 | /* partially copyrighted (C) 1993 by Hartmut Schirmer */ |
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| 9 | /* HH: Added 4bpp support, and use bytesperpixel. */ |
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| 10 | |||
| 11 | #include <stdio.h> |
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| 12 | #include "vga.h" |
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| 13 | #include "libvga.h" |
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| 14 | #include "driver.h" |
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| 15 | |||
| 16 | static inline void read_write(unsigned long off) |
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| 17 | { |
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| 18 | *(GM+off)=*(GM+off)+1; |
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| 19 | } |
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| 20 | |||
| 21 | int vga_drawpixel(int x, int y) |
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| 22 | { |
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| 23 | unsigned long offset; |
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| 24 | int c; |
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| 25 | |||
| 26 | if (MODEX) { |
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| 27 | /* select plane */ |
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| 28 | __svgalib_outseq(0x02,1 << (x & 3)); |
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| 29 | /* write color to pixel */ |
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| 30 | *(GM+y * CI.xbytes + (x >> 2))=COL; |
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| 31 | return 0; |
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| 32 | } |
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| 33 | switch (__svgalib_cur_info.bytesperpixel) { |
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| 34 | case 0: /* Must be 2 or 16 color mode. */ |
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| 35 | /* set up video page */ |
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| 36 | offset = y * CI.xbytes + (x >> 3); |
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| 37 | vga_setpage(offset >> 16); |
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| 38 | offset &= 0xffff; |
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| 39 | |||
| 40 | /* select bit */ |
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| 41 | __svgalib_outgra(0x08, 0x80 >> (x & 7)); |
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| 42 | |||
| 43 | /* read into latch and write dummy back */ |
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| 44 | read_write(offset); |
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| 45 | break; |
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| 46 | case 1: |
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| 47 | offset = y * CI.xbytes + x; |
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| 48 | |||
| 49 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 50 | *(LINEAR_POINTER+offset)=COL; |
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| 51 | } else { |
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| 52 | /* select segment */ |
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| 53 | vga_setpage(offset >> 16); |
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| 54 | |||
| 55 | /* write color to pixel */ |
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| 56 | *(GM+(offset&0xffff))=COL; |
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| 57 | } |
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| 58 | break; |
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| 59 | case 2: |
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| 60 | offset = y * CI.xbytes + x * 2; |
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| 61 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 62 | *(uint16_t *)(LINEAR_POINTER+offset)=COL; |
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| 63 | } else { |
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| 64 | vga_setpage(offset >> 16); |
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| 65 | *(uint16_t *)(GM+(offset&0xffff))=COL; |
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| 66 | } |
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| 67 | break; |
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| 68 | case 3: |
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| 69 | c = COL; |
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| 70 | offset = y * CI.xbytes + x * 3; |
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| 71 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 72 | /* Only on little endian */ |
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| 73 | *(LINEAR_POINTER+offset)=COL&0xff; |
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| 74 | *(LINEAR_POINTER+offset+1)=(COL&0xff00)>>8; |
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| 75 | *(LINEAR_POINTER+offset+2)=(COL&0xff0000)>>16; |
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| 76 | } else { |
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| 77 | vga_setpage(offset >> 16); |
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| 78 | switch (offset & 0xffff) { |
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| 79 | case 0xfffe: |
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| 80 | *(GM+0xfffe)=COL&0xff; |
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| 81 | *(GM+0xffff)=(COL&0xff00)>>8; |
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| 82 | vga_setpage((offset >> 16) + 1); |
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| 83 | *(GM)=(COL&0xff0000)>>16; |
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| 84 | break; |
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| 85 | case 0xffff: |
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| 86 | *(GM+0xffff)=COL&0xff; |
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| 87 | vga_setpage((offset >> 16) + 1); |
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| 88 | *(GM)=(COL&0xff00)>>8; |
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| 89 | *(GM+1)=(COL&0xff0000)>>16; |
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| 90 | break; |
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| 91 | default: |
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| 92 | offset &= 0xffff; |
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| 93 | *(GM+offset)=COL&0xff; |
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| 94 | *(GM+offset+1)=(COL&0xff00)>>8; |
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| 95 | *(GM+offset+2)=(COL&0xff0000)>>16; |
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| 96 | break; |
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| 97 | } |
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| 98 | } |
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| 99 | break; |
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| 100 | case 4: |
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| 101 | offset = y * __svgalib_cur_info.xbytes + x * 4; |
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| 102 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 103 | *(uint32_t *)(LINEAR_POINTER+offset)=COL; |
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| 104 | } else { |
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| 105 | vga_setpage(offset >> 16); |
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| 106 | *(uint32_t *)(GM+(offset&0xffff))=COL; |
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| 107 | } |
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| 108 | break; |
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| 109 | } |
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| 110 | return 0; |
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| 111 | } |
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| 112 | |||
| 113 | int vga_getpixel(int x, int y) |
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| 114 | { |
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| 115 | unsigned long offset; |
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| 116 | unsigned char mask; |
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| 117 | int pix = 0; |
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| 118 | |||
| 119 | if (MODEX) { |
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| 120 | /* select plane */ |
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| 121 | __svgalib_outseq(0x02, 1 << (x & 3) ); |
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| 122 | return gr_readb(y * CI.xbytes + (x >> 2)); |
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| 123 | } |
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| 124 | switch (__svgalib_cur_info.bytesperpixel) { |
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| 125 | case 0: /* Must be 2 or 16 color mode. */ |
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| 126 | /* set up video page */ |
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| 127 | offset = y * CI.xbytes + (x >> 3); |
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| 128 | vga_setpage(offset >> 16); |
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| 129 | offset &= 0xffff; |
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| 130 | |||
| 131 | /* select bit */ |
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| 132 | mask = 0x80 >> (x & 7); |
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| 133 | pix = 0; |
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| 134 | __svgalib_outgra(0x04,0); |
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| 135 | if (gr_readb(offset) & mask) |
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| 136 | pix |= 0x01; |
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| 137 | __svgalib_outgra(0x04,1); |
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| 138 | if (gr_readb(offset) & mask) |
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| 139 | pix |= 0x02; |
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| 140 | __svgalib_outgra(0x04,2); |
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| 141 | if (gr_readb(offset) & mask) |
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| 142 | pix |= 0x04; |
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| 143 | __svgalib_outgra(0x04,3); |
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| 144 | if (gr_readb(offset) & mask) |
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| 145 | pix |= 0x08; |
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| 146 | return pix; |
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| 147 | case 1: |
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| 148 | offset = y * CI.xbytes + x; |
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| 149 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 150 | return *(LINEAR_POINTER+offset); |
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| 151 | } |
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| 152 | /* select segment */ |
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| 153 | vga_setpage(offset >> 16); |
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| 154 | return gr_readb(offset & 0xffff); |
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| 155 | case 2: |
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| 156 | offset = y * CI.xbytes + x * 2; |
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| 157 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 158 | return *(uint16_t *)(LINEAR_POINTER+offset); |
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| 159 | } |
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| 160 | vga_setpage(offset >> 16); |
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| 161 | return gr_readw(offset & 0xffff); |
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| 162 | case 3: |
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| 163 | offset = y * CI.xbytes + x * 3; |
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| 164 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 165 | return (*(LINEAR_POINTER+offset)) + (*(LINEAR_POINTER+offset+1)<<8) + |
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| 166 | (*(LINEAR_POINTER+offset+2)<<16); |
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| 167 | } |
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| 168 | vga_setpage(offset >> 16); |
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| 169 | switch (offset & 0xffff) { |
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| 170 | case 0xfffe: |
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| 171 | pix = gr_readw(0xfffe); |
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| 172 | vga_setpage((offset >> 16) + 1); |
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| 173 | return pix + (gr_readb(0) << 16); |
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| 174 | case 0xffff: |
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| 175 | pix = gr_readb(0xffff); |
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| 176 | vga_setpage((offset >> 16) + 1); |
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| 177 | return pix + (gr_readw(0) << 8); |
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| 178 | default: |
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| 179 | offset &= 0xffff; |
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| 180 | return gr_readw(offset) + (gr_readb(offset + 2) << 16); |
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| 181 | } |
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| 182 | break; |
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| 183 | case 4: |
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| 184 | offset = y * __svgalib_cur_info.xbytes + x * 4; |
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| 185 | if (__svgalib_modeinfo_linearset & IS_LINEAR ) { |
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| 186 | return *(uint32_t *)(LINEAR_POINTER+offset); |
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| 187 | } |
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| 188 | vga_setpage(offset >> 16); |
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| 189 | return gr_readl(offset & 0xffff); |
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| 190 | } |
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| 191 | return 0; |
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| 192 | } |
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| 193 |