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vga: Implement svga offset

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This commit is contained in:
Fabian 2021-01-03 03:22:22 -06:00
parent 497f618cab
commit 18bbe45814
1 changed files with 19 additions and 12 deletions
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31
src/vga.js
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@ -2372,21 +2372,26 @@ VGAScreen.prototype.screen_fill_buffer = function()
switch(bpp)
{
case 32:
var start_pixel = start >> 2;
var end_pixel = (end >> 2) + 1;
var start_pixel = (start - this.svga_offset) >> 2;
var end_pixel = ((end - this.svga_offset) >> 2) + 1;
var addr = start >> 2;
for(var i = start_pixel; i < end_pixel; i++)
{
var dword = this.svga_memory32[i];
var dword = this.svga_memory32[addr++];
buffer[i] = dword << 16 | dword >> 16 & 0xFF | dword & 0xFF00 | 0xFF000000;
}
break;
case 24:
var start_pixel = start / 3 | 0;
var end_pixel = (end / 3 | 0) + 1;
var addr = start_pixel * 3;
start -= start % 3;
end += 3 - end % 3;
dbg_assert(this.svga_offset % 3 === 0);
var start_pixel = (start - this.svga_offset) / 3 | 0;
var end_pixel = ((end - this.svga_offset) / 3 | 0) + 1;
var addr = start;
for(var i = start_pixel; addr < end; i++)
{
@ -2399,12 +2404,13 @@ VGAScreen.prototype.screen_fill_buffer = function()
break;
case 16:
var start_pixel = start >> 1;
var end_pixel = (end >> 1) + 1;
var start_pixel = (start - this.svga_offset) >> 1;
var end_pixel = ((end - this.svga_offset) >> 1) + 1;
var addr = start >> 1;
for(var i = start_pixel; i < end_pixel; i++)
{
var word = this.svga_memory16[i];
var word = this.svga_memory16[addr++];
var blue = (word >> 11) * 0xFF / 0x1F | 0;
var green = (word >> 5 & 0x3F) * 0xFF / 0x3F | 0;
@ -2415,12 +2421,13 @@ VGAScreen.prototype.screen_fill_buffer = function()
break;
case 8:
var start_pixel = start;
var end_pixel = end + 1;
var start_pixel = start - this.svga_offset;
var end_pixel = end - this.svga_offset + 1;
var addr = start;
for(var i = start; i <= end; i++)
{
var color = this.vga256_palette[this.svga_memory[i]];
var color = this.vga256_palette[this.svga_memory[addr++]];
buffer[i] = color & 0xFF00 | color << 16 | color >> 16 | 0xFF000000;
}
break;