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8-bit renderer fix about the Tseng cards:

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Seems the Tseng cards are as incompatible as the S3 cards in terms of pure IBM VGA emulation, especially the chain4 stuff, so accomodate the fix to the renderer. Fixes 8bpp rendering on Tseng cards when invoked.
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TC1995
2023-11-21 20:06:12 +01:00
parent b90a353a18
commit a3fa181b01
1 changed files with 3 additions and 3 deletions
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6
src/video/vid_svga_render.c
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@@ -470,9 +470,9 @@ svga_render_indexed_gfx(svga_t *svga, bool highres, bool combine8bits)
const bool dwordincr = ((svga->crtc[0x14] & 0x20) != 0) && !wordincr; const bool dwordincr = ((svga->crtc[0x14] & 0x20) != 0) && !wordincr;
const bool dwordshift = ((svga->crtc[0x14] & 0x40) != 0); const bool dwordshift = ((svga->crtc[0x14] & 0x40) != 0);
const bool wordshift = ((svga->crtc[0x17] & 0x40) == 0) && !dwordshift; const bool wordshift = ((svga->crtc[0x17] & 0x40) == 0) && !dwordshift;
const uint32_t incbypow2 = combine8bits && svga->force_old_addr ? 0 : (dwordshift ? 2 : wordshift ? 1 : 0); const uint32_t incbypow2 = (combine8bits && (svga->force_old_addr || svga->packed_chain4)) ? 0 : (dwordshift ? 2 : wordshift ? 1 : 0);
const uint32_t incevery = combine8bits && svga->force_old_addr ? 1 : (dwordincr ? 4 : wordincr ? 2 : 1); const uint32_t incevery = (combine8bits && (svga->force_old_addr || svga->packed_chain4)) ? 1 : (dwordincr ? 4 : wordincr ? 2 : 1);
const uint32_t loadevery = combine8bits && svga->force_old_addr ? 1 : (dwordload ? 4 : wordload ? 2 : 1); const uint32_t loadevery = (combine8bits && (svga->force_old_addr || svga->packed_chain4)) ? 1 : (dwordload ? 4 : wordload ? 2 : 1);
const bool shift2bit = ((svga->gdcreg[0x05] & 0x60) == 0x20 ); const bool shift2bit = ((svga->gdcreg[0x05] & 0x60) == 0x20 );
const bool shift4bit = ((svga->gdcreg[0x05] & 0x40) == 0x40 ); const bool shift4bit = ((svga->gdcreg[0x05] & 0x40) == 0x40 );