81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
#include <ppu.h>
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#include <lcd.h>
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#include <string.h>
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#include <ppu_sm.h>
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void pipeline_fifo_reset();
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void pipeline_process();
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static ppu_context ctx;
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ppu_context *ppu_get_context() {
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return &ctx;
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}
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void ppu_init() {
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ctx.current_frame = 0;
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ctx.line_ticks = 0;
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ctx.video_buffer = malloc(YRES * XRES * sizeof(u32));
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ctx.pfc.line_x = 0;
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ctx.pfc.pushed_x = 0;
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ctx.pfc.fetch_x = 0;
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ctx.pfc.pixel_fifo.size = 0;
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ctx.pfc.pixel_fifo.head = ctx.pfc.pixel_fifo.tail = NULL;
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ctx.pfc.cur_fetch_state = FS_TILE;
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ctx.line_sprites = 0;
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ctx.fetched_entry_count = 0;
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ctx.window_line = 0;
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lcd_init();
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LCDS_MODE_SET(MODE_OAM);
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memset(ctx.oam_ram, 0, sizeof(ctx.oam_ram));
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memset(ctx.video_buffer, 0, YRES*XRES*sizeof(u32));
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}
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void ppu_tick() {
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ctx.line_ticks++;
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switch(LCDS_MODE) {
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case MODE_OAM:
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ppu_mode_oam();
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break;
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case MODE_XFER:
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ppu_mode_xfer();
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break;
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case MODE_VBLANK:
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ppu_mode_vblank();
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break;
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case MODE_HBLANK:
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ppu_mode_hblank();
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break;
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}
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}
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void ppu_oam_write(u16 address, u8 value) {
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if (address >= 0xFE00) {
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address -= 0xFE00;
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}
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u8 *p = (u8 *)ctx.oam_ram;
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p[address] = value;
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}
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u8 ppu_oam_read(u16 address){
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if (address > 0xFE00) {
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address -= 0xFE00;
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}
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u8 *p = (u8 *)ctx.oam_ram;
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return p[address];
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}
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void ppu_vram_write(u16 address, u8 value){
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ctx.vram[address - 0x8000] = value;
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}
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u8 ppu_vram_read(u16 address){
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return ctx.vram[address - 0x8000];
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} |