102 lines
1.7 KiB
C
102 lines
1.7 KiB
C
#include "ppu.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <memory.h>
|
|
#include "bus.h"
|
|
|
|
struct PPU* createPPU(struct Bus* parent)
|
|
{
|
|
struct PPU* ppu = (struct PPU*)malloc(sizeof(struct PPU));
|
|
if (ppu == NULL)
|
|
{
|
|
fprintf(stderr, "Failed to allocate memory for PPU object.\n");
|
|
exit(1);
|
|
}
|
|
|
|
ppu->bus = parent;
|
|
|
|
for (int i = 0; i < 2; i++)
|
|
{
|
|
ppu->patternTables[i] = (Byte*)malloc(0x1000);
|
|
if (ppu->patternTables[i] == NULL)
|
|
{
|
|
fprintf(stderr, "Failed to allocate memory for PPU pattern table #%d object.\n", i);
|
|
exit(1);
|
|
}
|
|
|
|
memset(ppu->patternTables[i], 0, 0x1000);
|
|
}
|
|
|
|
for (int i = 0; i < 4; i++)
|
|
{
|
|
ppu->nametables[i] = (Byte*)malloc(0x0400);
|
|
if (ppu->nametables[i] == NULL)
|
|
{
|
|
fprintf(stderr, "Failed to allocate memory for PPU nametable #%d object.\n", i);
|
|
exit(1);
|
|
}
|
|
|
|
memset(ppu->nametables[i], 0, 0x0400);
|
|
}
|
|
|
|
ppu->paletteIndexes = (Byte*)malloc(0x20);
|
|
if (ppu->paletteIndexes == NULL)
|
|
{
|
|
fprintf(stderr, "Failed to allocate memory for PPU palette RAM indexes.\n");
|
|
exit(1);
|
|
}
|
|
|
|
ppu->oam = (Byte*)malloc(0x100);
|
|
if (ppu->oam == NULL)
|
|
{
|
|
fprintf(stderr, "Failed to allocate memory for PPU OAM.\n");
|
|
exit(1);
|
|
}
|
|
|
|
ppu->ppuctrl.raw = 0b00000000;
|
|
ppu->ppumask.raw = 0b00000000;
|
|
ppu->ppustatus.raw = 0b10100000;
|
|
ppu->oamaddr = 0x00;
|
|
ppu->ppuAddr = 0x00;
|
|
ppu->ppuData = 0x00;
|
|
|
|
ppu->x = 0;
|
|
ppu->y = 0;
|
|
|
|
return ppu;
|
|
}
|
|
|
|
void destroyPPU(struct PPU* ppu)
|
|
{
|
|
free(ppu->oam);
|
|
free(ppu->paletteIndexes);
|
|
free(ppu->nametables);
|
|
free(ppu->patternTables);
|
|
|
|
free(ppu);
|
|
}
|
|
|
|
Byte ppuRead(struct PPU* ppu, Word addr)
|
|
{
|
|
return 0x00;
|
|
}
|
|
|
|
void ppuWrite(struct PPU* ppu, Word addr, Byte val)
|
|
{
|
|
}
|
|
|
|
void tickPPU(struct PPU* ppu)
|
|
{
|
|
ppu->x++;
|
|
|
|
if (ppu->x == 341)
|
|
{
|
|
ppu->x = 0;
|
|
ppu->y++;
|
|
|
|
if (ppu->y == 261)
|
|
ppu->y = 0;
|
|
}
|
|
}
|