doylet/dchip-8
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Fix font indexing offset incorrectly pitching ptr

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This commit is contained in:
Doyle Thai 2017-04-07 15:41:04 +10:00
parent 1a3ce032ac
commit f96394dde0
2 changed files with 6 additions and 7 deletions
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11
src/dchip8.cpp
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@ -287,7 +287,7 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
if (cpu.state == chip8state_load_file) if (cpu.state == chip8state_load_file)
{ {
PlatformFile file = {}; PlatformFile file = {};
if (platform_open_file(L"roms/brix", &file)) if (platform_open_file(L"roms/pong", &file))
{ {
DQNT_ASSERT((cpu.INIT_ADDRESS + file.size) <= DQNT_ASSERT((cpu.INIT_ADDRESS + file.size) <=
memory.permanentMemSize); memory.permanentMemSize);
@ -721,12 +721,11 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
DQNT_ASSERT(hexCharFromFontSet >= 0x00 && DQNT_ASSERT(hexCharFromFontSet >= 0x00 &&
hexCharFromFontSet <= 0x0F); hexCharFromFontSet <= 0x0F);
const u8 BITS_IN_BYTE = 8; const u32 START_ADDR_OF_FONT = 0;
u8 fontSizeInMem = BITS_IN_BYTE * 5; const u32 BYTES_PER_FONT = 5;
u16 startMemAddrOfFontSet = 0;
cpu.I = startMemAddrOfFontSet + cpu.I = START_ADDR_OF_FONT +
(hexCharFromFontSet * fontSizeInMem); (hexCharFromFontSet * BYTES_PER_FONT);
} }
// LD B, Vx - Fx33 - Store BCD representations of Vx in memory // LD B, Vx - Fx33 - Store BCD representations of Vx in memory
// locations I, I+1 and I+2 // locations I, I+1 and I+2