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DAC Fix for Win9x bootlogo progressbar (#693)

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pixelsuft‮ 2022-06-23 10:38:02 +07:00 committed by GitHub
parent 9d54932e52
commit cbe5e63201
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 2 deletions
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18
src/vga.js
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@ -1545,7 +1545,12 @@ VGAScreen.prototype.port3C9_write = function(color_byte)
offset = this.dac_color_index_write % 3,
color = this.vga256_palette[index];
color_byte = (color_byte & 0x3F) * 255 / 63 | 0;
if((this.dispi_enable_value & 0x20) === 0)
{
color_byte &= 0x3F;
const b = color_byte & 1;
color_byte = color_byte << 2 | b << 1 | b;
}
if(offset === 0)
{
@ -1576,9 +1581,18 @@ VGAScreen.prototype.port3C9_read = function()
var index = this.dac_color_index_read / 3 | 0;
var offset = this.dac_color_index_read % 3;
var color = this.vga256_palette[index];
var color8 = color >> (2 - offset) * 8 & 0xFF;
this.dac_color_index_read++;
return (color >> (2 - offset) * 8 & 0xFF) / 255 * 63 | 0;
if(this.dispi_enable_value & 0x20)
{
return color8;
}
else
{
return color8 >> 2;
}
};
VGAScreen.prototype.port3CC_read = function()