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starting to implement true TileRenderer

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This commit is contained in:
Clément Le Bihan
2021-05-24 00:28:08 +02:00
parent 4e42c4774a
commit 4024b51c9f
8 changed files with 194 additions and 77 deletions
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10
sources/PPU/Background.cpp
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@@ -121,10 +121,10 @@ namespace ComSquare::PPU
return this->getPixelReferenceFromTileRow(tileAddress, column);
}
uint8_t Background::getPixelReferenceFromTileRow(uint16_t tileAddress, uint8_t pixelIndex)
uint8_t Background::getPixelReferenceFromTileRow(uint16_t tileRowAddress, uint8_t pixelIndex)
{
uint8_t highByte = this->_vram->read(tileAddress % VRAMSIZE);
uint8_t lowByte = this->_vram->read((tileAddress + 1) % VRAMSIZE);
uint8_t highByte = this->_vram->read(tileRowAddress % VRAMSIZE);
uint8_t lowByte = this->_vram->read((tileRowAddress + 1) % VRAMSIZE);
uint8_t secondHighByte;
uint8_t secondLowByte;
uint16_t result = 0;
@@ -134,8 +134,8 @@ namespace ComSquare::PPU
case 8:
return highByte;
case 4:
secondHighByte = this->_vram->read((tileAddress + 16) % VRAMSIZE);
secondLowByte = this->_vram->read((tileAddress + 17) % VRAMSIZE);
secondHighByte = this->_vram->read((tileRowAddress + 16) % VRAMSIZE);
secondLowByte = this->_vram->read((tileRowAddress + 17) % VRAMSIZE);
result = ((secondHighByte & (1U << shift)) | ((secondLowByte & (1U << shift)) << 1U));
result = (shift - 2 >= 0) ? result >> (shift - 2) : result << ((shift - 2) * -1);
FALLTHROUGH