1 files changed, 0 insertions, 140 deletions
diff --git a/apu.c b/apu.c
deleted file mode 100644
index 46a484d..0000000
--- a/apu.c
+++ /dev/null
@@ -1,140 +0,0 @@
-
-
-static inline void ppu_tick(struct nes_state *state);
-static inline uint8_t memory_read(struct nes_state *state, uint32_t offset);
-
-// DMC frequency table (NTSC)
-static const uint16_t dmc_rate_table[16] = {
-	428, 380, 340, 320, 286, 254, 226, 214,
-	190, 160, 142, 128, 106,  85,  72,  54
-};
-
-// $4015 write
-static void apu_write4015(struct nes_state *state, uint8_t val) {
-	struct apu_state *apu = &state->apu;
-
-	if(val & 0x10) {
-		if(!apu->dmc_dma_enabled || apu->dmc_bytes_remaining == 0) {
-			apu->dmc_current_addr = 0xC000 + ((uint16_t)apu->dmc_sample_addr << 6);
-			apu->dmc_bytes_remaining = ((uint16_t)apu->dmc_sample_len << 4);
-		}
-		apu->dmc_dma_enabled = 1;
-	} else {
-		apu->dmc_dma_enabled = 0;
-	}
-}
-
-// $4015 read
-static uint8_t apu_read4015(struct nes_state *state) {
-	struct apu_state *apu = &state->apu;
-	uint8_t result = 0;
-
-	if(apu->dmc_bytes_remaining > 0) {
-		result |= 0x10;
-	}
-	if(apu->irq_pending) {
-		result |= 0x40;
-		apu->irq_pending = 0;
-	}
-	return result;
-}
-
-// $4010–$4013, $4015 write
-static void apu_write(struct nes_state *state, uint16_t addr, uint8_t val) {
-	struct apu_state *apu = &state->apu;
-
-	switch(addr) {
-		case 0x4010: {
-			apu->dmc_irq_enable = (val >> 7) & 1;
-			apu->dmc_loop_flag = (val >> 6) & 1;
-			apu->dmc_freq_index = val & 0x0F;
-		} break;
-		case 0x4011: {
-			// DAC write ignored
-		} break;
-		case 0x4012: {
-			apu->dmc_sample_addr = val;
-		} break;
-		case 0x4013: {
-			apu->dmc_sample_len = val;
-		} break;
-		case 0x4015: {
-			apu_write4015(state, val);
-		} break;
-	}
-}
-
-// APU tick
-static inline void apu_tick(struct nes_state *state) {
-	return;
-	struct apu_state *apu = &state->apu;
-
-	apu->frame_cycle++;
-
-	if(apu->mode == 0) {
-		if(apu->frame_cycle == 7457) {
-			// Quarter frame
-		} else if(apu->frame_cycle == 14913) {
-			// Quarter frame
-			// Half frame
-		} else if(apu->frame_cycle == 22371) {
-			// Quarter frame
-		} else if(apu->frame_cycle == 29829) {
-			// Half frame
-			if(!apu->irq_inhibit) {
-				apu->irq_pending = 1;
-			}
-		} else if(apu->frame_cycle >= 29830) {
-			apu->frame_cycle = 0;
-		}
-	} else {
-		if(apu->frame_cycle == 7457) {
-			// Quarter frame
-		} else if(apu->frame_cycle == 14913) {
-			// Quarter frame
-			// Half frame
-		} else if(apu->frame_cycle == 22371) {
-			// Quarter frame
-		} else if(apu->frame_cycle == 29829) {
-			// Half frame
-		} else if(apu->frame_cycle == 37281) {
-			// Quarter frame
-		} else if(apu->frame_cycle >= 37282) {
-			apu->frame_cycle = 0;
-		}
-	}
-
-	if(apu->dmc_dma_enabled && apu->dmc_bytes_remaining > 0) {
-		apu->dmc_sample_timer++;
-		if(apu->dmc_sample_timer >= dmc_rate_table[apu->dmc_freq_index]) {
-			apu->dmc_sample_timer = 0;
-
-			uint8_t val = memory_read(state, apu->dmc_current_addr);
-			(void)val;
-
-			apu->dmc_current_addr++;
-			if(apu->dmc_current_addr == 0x0000) {
-				apu->dmc_current_addr = 0x8000;
-			}
-
-			apu->dmc_bytes_remaining--;
-
-			if(apu->dmc_bytes_remaining == 0) {
-				if(apu->dmc_loop_flag) {
-					apu->dmc_current_addr = 0xC000 + ((uint16_t)apu->dmc_sample_addr << 6);
-					apu->dmc_bytes_remaining = ((uint16_t)apu->dmc_sample_len << 4);
-				} else {
-					if(apu->dmc_irq_enable) {
-						apu->irq_pending = 1;
-					}
-					apu->dmc_dma_enabled = 0;
-				}
-			}
-
-			for(uint32_t i = 0; i < 4; i++) {
-				state->cpu.cycles++;
-				ppu_tick(state);
-			}
-		}
-	}
-}