zoriya/ComSquare
1
0
Fork 0
mirror of https://github.com/zoriya/ComSquare.git synced 2026-05-28 16:43:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

setting the modification of getTilePixelReference

Browse Source
This commit is contained in:
Clément Le Bihan
2020-09-30 00:09:09 +02:00
parent fa97b2ab38
commit 2d0e250982
5 changed files with 39 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sources/PPU/Background.cpp
+5 -3
View File
@@ -100,13 +100,15 @@ namespace ComSquare::PPU
return palette;
}
uint8_t Background::getTilePixelReference(uint16_t addr, int nb)
uint8_t Background::getTilePixelReference(uint16_t addr, int index)
{
//line by line for each pixel of the line
uint8_t highByte = this->_vram->read_internal(addr % VRAMSIZE);
uint8_t lowByte = this->_vram->read_internal((addr + 1) % VRAMSIZE);
uint8_t secondHightByte;
uint8_t secondLowByte;
uint8_t result = 0;
uint8_t shift = (TILE_PIXEL_WIDTH - 1 - index);
// C000
switch (this->_bpp) {
@@ -115,9 +117,9 @@ namespace ComSquare::PPU
case 4:
secondHightByte = this->_vram->read_internal((addr + 32) % VRAMSIZE);
secondLowByte = this->_vram->read_internal((addr + 33) % VRAMSIZE);
result = ((secondHightByte & (1U << (7U - nb))) | ((secondLowByte & (1U << (7U - nb))) << 1U)) >> (7U - nb - 2);
result = ((secondHightByte & (1U << (7U - index))) | ((secondLowByte & (1U << (7U - index))) << 1U)) >> (7U - index - 2);
case 2:
result += ((highByte & (1U << (7U - nb))) | ((lowByte & (1U << (7U - nb))) << 1U)) >> (7U - nb);
result += ((highByte & (1U << (7U - index))) | ((lowByte & (1U << (7U - index))) << 1U)) >> (7U - index);
default:
break;
}