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Make the PPU background color available and mirroring the pallet. #15

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Make the PPU background color available and mirroring the pallet. #15

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22 changes: 16 additions & 6 deletions Part #4 - PPU Backgrounds/olc2C02.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,7 @@

Author
~~~~~~
David Barr, aka javidx9, �OneLoneCoder 2019
David Barr, aka javidx9, ©OneLoneCoder 2019
*/

#include "olc2C02.h"
Expand Down Expand Up @@ -206,7 +206,8 @@ olc::Sprite& olc2C02::GetPatternTable(uint8_t i, uint8_t palette)
{
// We can get the index value by simply adding the bits together
// but we're only interested in the lsb of the row words because...
uint8_t pixel = (tile_lsb & 0x01) + (tile_msb & 0x01);
// uint8_t pixel = (tile_lsb & 0x01) + (tile_msb & 0x01);
uint8_t pixel = (tile_lsb & 0x01) + ((tile_msb & 0x01) << 1);

// ...we will shift the row words 1 bit right for each column of
// the character.
Expand Down Expand Up @@ -524,10 +525,19 @@ void olc2C02::ppuWrite(uint16_t addr, uint8_t data)
else if (addr >= 0x3F00 && addr <= 0x3FFF)
{
addr &= 0x001F;
if (addr == 0x0010) addr = 0x0000;
if (addr == 0x0014) addr = 0x0004;
if (addr == 0x0018) addr = 0x0008;
if (addr == 0x001C) addr = 0x000C;
// if (addr == 0x0010) addr = 0x0000;
// if (addr == 0x0014) addr = 0x0004;
// if (addr == 0x0018) addr = 0x0008;
// if (addr == 0x001C) addr = 0x000C;
if ((addr == 0x0004) ||
(addr == 0x0008) ||
(addr == 0x000C) ||
(addr == 0x0010) ||
(addr == 0x0014) ||
(addr == 0x0018) ||
(addr == 0x001C)
) addr = 0x0000;

tblPalette[addr] = data;
}
}
Expand Down