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Viewing changes to src/sms/vdp.cpp

  • Committer: Package Import Robot
  • Author(s): Stephen Kitt
  • Date: 2012-01-31 07:21:35 UTC
  • mfrom: (1.2.8)
  • Revision ID: package-import@ubuntu.com-20120131072135-es3dj12y00xcnrsk
Tags: 0.9.19-1
* New upstream WIP version.
* Update copyright information.
* Refresh use-system-tremor.patch and remove psx-big-endian-only.patch.
* Add spelling-fixes.patch based on Lintian's recommendations.
* Build-depend on debhelper 9 or later and remove corresponding Lintian
  override.

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Lines of Context:
src/sms/vdp.cpp
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/* Initialize VDP emulation */
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void vdp_init(void)
 
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void vdp_init(bool want_quirk)
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{
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 memset(&vdp, 0, sizeof(vdp_t));
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 vdp.lines_per_frame = (sms.display == DISPLAY_NTSC) ? 262 : 313;
 
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 vdp.quirk_disabled = !want_quirk;
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 vdp_reset();
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}
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 vdp.mode = 0;
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 vdp.vint_pending = 0;
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 vdp.hint_pending = 0;
 
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 vdp.hc_latch = 0;
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 vdp.cram_latch = 0;
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 vdp.bd = 0;
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}
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void vdp_hclatch(void)
 
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{
 
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 unsigned int pixel_pos = ((sms.timestamp % CYCLES_PER_LINE) * 3) >> 1;
 
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 if(pixel_pos >= 0x128)
 
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  pixel_pos += 0xAA;
 
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 vdp.hc_latch = pixel_pos >> 1;
 
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}
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void viewport_check(void)
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{
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uint8 vdp_counter_r(int offset)
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{
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    int pixel_pos;
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    switch(offset & 1)
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    {
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        case 0: /* V Counter */
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            return vc_table[sms.display][vdp.extended][vdp.line & 0x1FF];
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        case 1: /* H Counter */
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            //pixel_pos = (((z80_get_elapsed_cycles() % CYCLES_PER_LINE) / 4) * 3) * 2;
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            // FIXME
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            // FIXME
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            pixel_pos = (((sms.timestamp % CYCLES_PER_LINE) / 4) * 3) * 2;
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            return hc_table[0][(pixel_pos >> 1) & 0x01FF];
 
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                vdp_hclatch();  // FIXME, call from pio.cpp under right conditions instead.
 
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            return vdp.hc_latch;
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    }
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    /* Just to please the compiler */
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    for(vdp.line = 0; vdp.line < vdp.lines_per_frame;)
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    {
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        int moohack = 228;
 
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        int moohack = CYCLES_PER_LINE;
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        ExecuteCycles(228 - 32);
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        moohack -= 228 - 32;
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  SFVARN(vdp.mode, "mode"),
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  SFVARN(vdp.vint_pending, "vint_pending"),
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  SFVARN(vdp.hint_pending, "hint_pending"),
 
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  SFVARN(vdp.hc_latch, "hc_latch"),
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  SFVARN(vdp.cram_latch, "cram_latch"),
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  SFVARN(vdp.bd, "bd"),
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