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fix colors in double-hi-res; bit order is swizzled like in double-lo-res

This commit is contained in:
Jorj Bauer 2021-01-17 08:42:53 -05:00
parent b6bbbe5a2b
commit ecb32dd873
1 changed files with 6 additions and 5 deletions
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11
apple/appledisplay.cpp
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@ -5,7 +5,7 @@
#include "font.h"
/* Fourpossible Hi-Res color-drawing modes..
/* Four possible Hi-Res color-drawing modes..
MONOCHROME: show all the pixels, but only in green;
BLACKANDWHITE: monochrome, but use B&W instead of B&G;
NTSCLIKE: reduce the resolution to 140 pixels wide, similar to how an NTSC monitor would blend it
@ -190,6 +190,7 @@ inline void AppleDisplay::Draw14DoubleHiresPixelsAt(uint16_t addr)
}
// Make sure it's a valid graphics area, not a dead hole
#define UNSWIZ(x) ((((x)&0x77)<<1) | (((x)&0x88)>>3))
if (col <= 280 && row <= 192) {
// Grab the 4 bytes we care about
uint8_t b1A = mmu->readDirect(addr, 0);
@ -205,22 +206,22 @@ inline void AppleDisplay::Draw14DoubleHiresPixelsAt(uint16_t addr)
bitTrain |= (b1A & 0x7F);
bitTrain <<= 7;
bitTrain |= (b1B & 0x7F);
// Now we pop groups of 4 bits off the bottom and draw.
for (int8_t xoff = 0; xoff < 14; xoff += 2) {
uint8_t color = bitTrain & 0x0F;
color = UNSWIZ(color); //((color & 7) << 1) | ((color & 8) >> 3); // un-swizzle the bits
if (g_displayType == m_ntsclike) {
// NTSC-like color - use drawApplePixel to show the messy NTSC color bleeds.
// This draws two doubled pixels with greater color, but lower pixel, resolution.
drawApplePixel(bitTrain & 0x0F, col+xoff, row);
drawApplePixel(bitTrain & 0x0F, col+xoff+1,row);
drawApplePixel(color, col+xoff, row);
drawApplePixel(color, col+xoff+1,row);
} else {
// Perfect color, B&W, monochrome. Draw an exact version of the pixels, and let
// the physical display figure out if they need to be reduced to B&W or not
// (for the most part - the m_blackAndWhite piece here allows full-res displays
// to give the crispest resolution.)
uint8_t color = bitTrain & 0x0F;
if (g_displayType == m_blackAndWhite) { color = c_white; }
g_display->cachePixel((col*2)+(xoff*2), row,