mirror of https://github.com/mgba-emu/mgba.git
GB: Add basic I/O, interrupts and video
This commit is contained in:
parent
64676529ba
commit
8622ba7ed0
68
src/gb/gb.c
68
src/gb/gb.c
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@ -5,6 +5,8 @@
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gb.h"
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#include "gb/io.h"
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#include "util/crc32.h"
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#include "util/memory.h"
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#include "util/math.h"
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@ -30,17 +32,18 @@ void GBCreate(struct GB* gb) {
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}
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static void GBInit(struct LR35902Core* cpu, struct LR35902Component* component) {
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struct GB* gba = (struct GB*) component;
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gba->cpu = cpu;
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struct GB* gb = (struct GB*) component;
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gb->cpu = cpu;
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GBInterruptHandlerInit(&cpu->irqh);
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GBMemoryInit(gba);
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GBMemoryInit(gb);
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GBVideoInit(&gb->video);
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gba->romVf = 0;
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gb->romVf = 0;
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gba->pristineRom = 0;
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gba->pristineRomSize = 0;
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gba->yankedRomSize = 0;
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gb->pristineRom = 0;
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gb->pristineRomSize = 0;
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gb->yankedRomSize = 0;
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}
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bool GBLoadROM(struct GB* gb, struct VFile* vf, struct VFile* sav, const char* fname) {
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@ -120,17 +123,62 @@ void GBReset(struct LR35902Core* cpu) {
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gb->yankedRomSize = 0;
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}
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GBMemoryReset(gb);
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gb->video.p = gb;
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GBVideoReset(&gb->video);
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}
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void GBUpdateIRQs(struct GB* gb) {
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if (!gb->memory.ime) {
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return;
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}
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int irqs = gb->memory.ie & gb->memory.io[REG_IF];
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if (!irqs) {
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return;
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}
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if (irqs & (1 << GB_IRQ_VBLANK)) {
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LR35902RaiseIRQ(gb->cpu, GB_VECTOR_VBLANK);
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return;
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}
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if (irqs & (1 << GB_IRQ_LCDSTAT)) {
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LR35902RaiseIRQ(gb->cpu, GB_VECTOR_LCDSTAT);
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return;
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}
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if (irqs & (1 << GB_IRQ_TIMER)) {
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LR35902RaiseIRQ(gb->cpu, GB_VECTOR_TIMER);
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return;
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}
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if (irqs & (1 << GB_IRQ_SIO)) {
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LR35902RaiseIRQ(gb->cpu, GB_VECTOR_SIO);
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return;
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}
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if (irqs & (1 << GB_IRQ_KEYPAD)) {
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LR35902RaiseIRQ(gb->cpu, GB_VECTOR_KEYPAD);
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}
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}
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void GBProcessEvents(struct LR35902Core* cpu) {
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// TODO
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struct GB* gb = (struct GB*) cpu->master;
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int32_t cycles = cpu->nextEvent;
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int32_t nextEvent = INT_MAX;
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int32_t testEvent;
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testEvent = GBVideoProcessEvents(&gb->video, cycles);
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if (testEvent < nextEvent) {
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nextEvent = testEvent;
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}
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cpu->cycles -= cycles;
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cpu->nextEvent = nextEvent;
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}
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void GBSetInterrupts(struct LR35902Core* cpu, bool enable) {
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// TODO
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struct GB* gb = (struct GB*) cpu->master;
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gb->memory.ime = enable;
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GBUpdateIRQs(gb);
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}
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void GBHitStub(struct LR35902Core* cpu) {
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// TODO
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printf("Hit stub at address %04X\n", cpu->pc);
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//printf("Hit stub at address %04X\n", cpu->pc);
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}
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14
src/gb/gb.h
14
src/gb/gb.h
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@ -11,6 +11,7 @@
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#include "lr35902/lr35902.h"
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#include "gb/memory.h"
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#include "gb/video.h"
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extern const uint32_t DMG_LR35902_FREQUENCY;
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extern const uint32_t CGB_LR35902_FREQUENCY;
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@ -25,11 +26,20 @@ enum GBIRQ {
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GB_IRQ_KEYPAD = 0x4,
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};
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enum GBIRQVector {
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GB_VECTOR_VBLANK = 0x40,
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GB_VECTOR_LCDSTAT = 0x48,
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GB_VECTOR_TIMER = 0x50,
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GB_VECTOR_SIO = 0x58,
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GB_VECTOR_KEYPAD = 0x60,
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};
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struct GB {
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struct LR35902Component d;
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struct LR35902Core* cpu;
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struct GBMemory memory;
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struct GBVideo video;
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int* keySource;
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@ -47,9 +57,7 @@ void GBDestroy(struct GB* gb);
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void GBReset(struct LR35902Core* cpu);
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void GBWriteIE(struct GB* gb, uint8_t value);
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void GBRaiseIRQ(struct GB* gb, enum GBIRQ irq);
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void GBTestIRQ(struct LR35902Core* cpu);
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void GBUpdateIRQs(struct GB* gb);
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void GBHalt(struct GB* gb);
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void GBStop(struct GB* gb);
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@ -0,0 +1,52 @@
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/* Copyright (c) 2013-2016 Jeffrey Pfau
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "io.h"
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#include "gb/gb.h"
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void GBIOInit(struct GB* gb) {
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memset(gb->memory.io, 0, sizeof(gb->memory.io));
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}
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void GBIOWrite(struct GB* gb, unsigned address, uint8_t value) {
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switch (address) {
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case REG_IF:
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gb->memory.io[REG_IF] = value;
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GBUpdateIRQs(gb);
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return;
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case REG_LCDC:
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// TODO: handle GBC differences
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GBVideoWriteLCDC(&gb->video, value);
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break;
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case REG_IE:
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gb->memory.ie = value;
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GBUpdateIRQs(gb);
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break;
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default:
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// TODO: Log
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if (address >= GB_SIZE_IO) {
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return;
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}
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break;
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}
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gb->memory.io[address] = value;
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}
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uint8_t GBIORead(struct GB* gb, unsigned address) {
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switch (address) {
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case REG_IF:
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break;
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case REG_IE:
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return gb->memory.ie;
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default:
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// TODO: Log
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if (address >= GB_SIZE_IO) {
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return 0;
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}
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break;
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}
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return gb->memory.io[address];
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}
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@ -0,0 +1,86 @@
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/* Copyright (c) 2013-2016 Jeffrey Pfau
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GB_IO_H
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#define GB_IO_H
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#include "util/common.h"
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enum GBIORegisters {
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REG_JOYP = 0x00,
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REG_SB = 0x01,
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REG_SC = 0x02,
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// Timing
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REG_DIV = 0x04,
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REG_TIMA = 0x05,
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REG_TMA = 0x06,
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REG_TAC = 0x07,
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// Interrupts
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REG_IF = 0x0F,
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REG_IE = 0xFF,
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// Audio
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REG_NR10 = 0x10,
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REG_NR11 = 0x11,
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REG_NR12 = 0x12,
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REG_NR13 = 0x13,
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REG_NR14 = 0x14,
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REG_NR21 = 0x16,
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REG_NR22 = 0x17,
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REG_NR23 = 0x18,
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REG_NR24 = 0x19,
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REG_NR30 = 0x1A,
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REG_NR31 = 0x1B,
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REG_NR32 = 0x1C,
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REG_NR33 = 0x1D,
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REG_NR34 = 0x1E,
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REG_NR41 = 0x20,
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REG_NR42 = 0x21,
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REG_NR43 = 0x22,
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REG_NR44 = 0x23,
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REG_NR50 = 0x24,
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REG_NR51 = 0x25,
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REG_NR52 = 0x26,
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REG_WAVE_0 = 0x30,
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REG_WAVE_1 = 0x31,
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REG_WAVE_2 = 0x32,
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REG_WAVE_3 = 0x33,
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REG_WAVE_4 = 0x34,
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REG_WAVE_5 = 0x35,
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REG_WAVE_6 = 0x36,
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REG_WAVE_7 = 0x37,
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REG_WAVE_8 = 0x38,
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REG_WAVE_9 = 0x39,
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REG_WAVE_A = 0x3A,
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REG_WAVE_B = 0x3B,
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REG_WAVE_C = 0x3C,
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REG_WAVE_D = 0x3D,
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REG_WAVE_E = 0x3E,
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REG_WAVE_F = 0x3F,
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// Video
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REG_LCDC = 0x40,
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REG_STAT = 0x41,
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REG_SCY = 0x42,
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REG_SCX = 0x43,
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REG_LY = 0x44,
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REG_LYC = 0x45,
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REG_DMA = 0x46,
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REG_BGP = 0x47,
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REG_OBP0 = 0x48,
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REG_OBP1 = 0x49,
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REG_WY = 0x4A,
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REG_WX = 0x4B,
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};
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struct GB;
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void GBIOInit(struct GB* gb);
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void GBIOWrite(struct GB* gb, unsigned address, uint8_t value);
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uint8_t GBIORead(struct GB* gb, unsigned address);
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#endif
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#include "memory.h"
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#include "gb/gb.h"
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#include "gb/io.h"
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#include "util/memory.h"
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gb->memory.rom = 0;
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gb->memory.romBank = 0;
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gb->memory.romSize = 0;
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memset(gb->memory.hram, 0, sizeof(gb->memory.hram));
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GBIOInit(gb);
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}
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void GBMemoryDeinit(struct GB* gb) {
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case GB_REGION_WORKING_RAM_BANK1:
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return memory->wramBank[address & (GB_SIZE_WORKING_RAM_BANK0 - 1)];
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default:
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if (address < GB_BASE_OAM) {
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return memory->wramBank[address & (GB_SIZE_WORKING_RAM_BANK0 - 1)];
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}
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if (address < GB_BASE_IO) {
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// TODO
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return 0;
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}
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if (address < GB_BASE_HRAM) {
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return GBIORead(gb, address & (GB_SIZE_IO - 1));
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}
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if (address < GB_BASE_IE) {
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return memory->hram[address & GB_SIZE_HRAM];
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}
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return GBIORead(gb, REG_IE);
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}
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}
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void GBStore16(struct LR35902Core* cpu, uint16_t address, int16_t value) {
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memory->wramBank[address & (GB_SIZE_WORKING_RAM_BANK0 - 1)] = value;
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return;
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default:
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if (address < GB_BASE_OAM) {
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memory->wramBank[address & (GB_SIZE_WORKING_RAM_BANK0 - 1)] = value;
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} else if (address < GB_BASE_IO) {
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// TODO
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return;
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} else if (address < GB_BASE_HRAM) {
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GBIOWrite(gb, address & (GB_SIZE_IO - 1), value);
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} else if (address < GB_BASE_IE) {
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memory->hram[address & GB_SIZE_HRAM] = value;
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} else {
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GBIOWrite(gb, REG_IE, value);
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}
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}
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}
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@ -54,6 +54,12 @@ struct GBMemory {
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uint8_t* wram;
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uint8_t* wramBank;
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uint8_t io[GB_SIZE_IO];
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bool ime;
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uint8_t ie;
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uint8_t hram[GB_SIZE_HRAM];
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size_t romSize;
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};
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@ -0,0 +1,166 @@
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/* Copyright (c) 2013-2016 Jeffrey Pfau
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "video.h"
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#include "gb/gb.h"
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#include "gb/io.h"
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#include "util/memory.h"
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static void GBVideoDummyRendererInit(struct GBVideoRenderer* renderer);
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static void GBVideoDummyRendererReset(struct GBVideoRenderer* renderer);
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static void GBVideoDummyRendererDeinit(struct GBVideoRenderer* renderer);
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static uint8_t GBVideoDummyRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value);
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static void GBVideoDummyRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address);
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static void GBVideoDummyRendererDrawScanline(struct GBVideoRenderer* renderer, int y);
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static void GBVideoDummyRendererFinishFrame(struct GBVideoRenderer* renderer);
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static void GBVideoDummyRendererGetPixels(struct GBVideoRenderer* renderer, unsigned* stride, const void** pixels);
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static struct GBVideoRenderer dummyRenderer = {
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.init = GBVideoDummyRendererInit,
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.reset = GBVideoDummyRendererReset,
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.deinit = GBVideoDummyRendererDeinit,
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.writeVideoRegister = GBVideoDummyRendererWriteVideoRegister,
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.writeVRAM = GBVideoDummyRendererWriteVRAM,
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.drawScanline = GBVideoDummyRendererDrawScanline,
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.finishFrame = GBVideoDummyRendererFinishFrame,
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.getPixels = GBVideoDummyRendererGetPixels
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};
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void GBVideoInit(struct GBVideo* video) {
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video->renderer = &dummyRenderer;
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video->vram = 0;
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video->frameskip = 0;
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}
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void GBVideoReset(struct GBVideo* video) {
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video->ly = 0;
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video->mode = 1;
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video->nextEvent = INT_MAX;
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video->eventDiff = 0;
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video->nextMode = INT_MAX;
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video->frameCounter = 0;
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video->frameskipCounter = 0;
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if (video->vram) {
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mappedMemoryFree(video->vram, GB_SIZE_VRAM);
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}
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video->vram = anonymousMemoryMap(GB_SIZE_VRAM);
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video->renderer->vram = video->vram;
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video->renderer->deinit(video->renderer);
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video->renderer->init(video->renderer);
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}
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void GBVideoDeinit(struct GBVideo* video) {
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GBVideoAssociateRenderer(video, &dummyRenderer);
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mappedMemoryFree(video->vram, GB_SIZE_VRAM);
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}
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void GBVideoAssociateRenderer(struct GBVideo* video, struct GBVideoRenderer* renderer) {
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// TODO
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}
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int32_t GBVideoProcessEvents(struct GBVideo* video, int32_t cycles) {
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video->eventDiff += cycles;
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if (video->nextEvent != INT_MAX) {
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video->nextEvent -= cycles;
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}
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if (video->nextEvent <= 0) {
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if (video->nextEvent != INT_MAX) {
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video->nextMode -= video->eventDiff;
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}
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if (video->nextMode <= 0) {
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video->mode = (video->mode + 1) & 3;
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switch (video->mode) {
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case 0:
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video->nextMode = GB_VIDEO_MODE_0_LENGTH;
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break;
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case 1:
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video->nextMode = GB_VIDEO_MODE_1_LENGTH;
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break;
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case 2:
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video->nextMode = GB_VIDEO_MODE_2_LENGTH;
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++video->ly;
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if (video->ly >= GB_VIDEO_VERTICAL_TOTAL_PIXELS) {
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video->ly = 0;
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++video->frameCounter;
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}
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video->p->memory.io[REG_LY] = video->ly;
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break;
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case 3:
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video->nextMode = GB_VIDEO_MODE_3_LENGTH;
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break;
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}
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}
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video->nextEvent = video->nextMode;
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video->eventDiff = 0;
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}
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return video->nextEvent;
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}
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void GBVideoWriteLCDC(struct GBVideo* video, GBRegisterLCDC value) {
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if (!GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC]) && GBRegisterLCDCIsEnable(value)) {
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// TODO: Does enabling the LCD start in vblank?
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video->mode = 2;
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video->nextMode = GB_VIDEO_MODE_2_LENGTH;
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video->nextEvent = video->nextMode;
|
||||
video->eventDiff = 0;
|
||||
if (video->nextEvent < video->p->cpu->nextEvent) {
|
||||
video->p->cpu->nextEvent = video->nextEvent;
|
||||
}
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererInit(struct GBVideoRenderer* renderer) {
|
||||
UNUSED(renderer);
|
||||
// Nothing to do
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererReset(struct GBVideoRenderer* renderer) {
|
||||
UNUSED(renderer);
|
||||
// Nothing to do
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererDeinit(struct GBVideoRenderer* renderer) {
|
||||
UNUSED(renderer);
|
||||
// Nothing to do
|
||||
}
|
||||
|
||||
static uint8_t GBVideoDummyRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value) {
|
||||
UNUSED(renderer);
|
||||
UNUSED(address);
|
||||
return value;
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address) {
|
||||
UNUSED(renderer);
|
||||
UNUSED(address);
|
||||
// Nothing to do
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererDrawScanline(struct GBVideoRenderer* renderer, int y) {
|
||||
UNUSED(renderer);
|
||||
UNUSED(y);
|
||||
// Nothing to do
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererFinishFrame(struct GBVideoRenderer* renderer) {
|
||||
UNUSED(renderer);
|
||||
// Nothing to do
|
||||
}
|
||||
|
||||
static void GBVideoDummyRendererGetPixels(struct GBVideoRenderer* renderer, unsigned* stride, const void** pixels) {
|
||||
UNUSED(renderer);
|
||||
UNUSED(stride);
|
||||
UNUSED(pixels);
|
||||
// Nothing to do
|
||||
}
|
|
@ -0,0 +1,78 @@
|
|||
/* Copyright (c) 2013-2016 Jeffrey Pfau
|
||||
*
|
||||
* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
#ifndef GB_VIDEO_H
|
||||
#define GB_VIDEO_H
|
||||
|
||||
#include "util/common.h"
|
||||
|
||||
#include "gb/memory.h"
|
||||
|
||||
enum {
|
||||
GB_VIDEO_HORIZONTAL_PIXELS = 160,
|
||||
GB_VIDEO_VERTICAL_PIXELS = 144,
|
||||
GB_VIDEO_VBLANK_PIXELS = 10,
|
||||
GB_VIDEO_VERTICAL_TOTAL_PIXELS = GB_VIDEO_VERTICAL_PIXELS + GB_VIDEO_VBLANK_PIXELS,
|
||||
|
||||
GB_VIDEO_MODE_0_LENGTH = 203, // Estimates, figure out with more precision
|
||||
GB_VIDEO_MODE_2_LENGTH = 81,
|
||||
GB_VIDEO_MODE_3_LENGTH = 172,
|
||||
|
||||
GB_VIDEO_HORIZONTAL_LENGTH = GB_VIDEO_MODE_0_LENGTH + GB_VIDEO_MODE_2_LENGTH + GB_VIDEO_MODE_3_LENGTH,
|
||||
|
||||
GB_VIDEO_MODE_1_LENGTH = GB_VIDEO_HORIZONTAL_LENGTH * GB_VIDEO_VBLANK_PIXELS,
|
||||
GB_VIDEO_TOTAL_LENGTH = GB_VIDEO_HORIZONTAL_LENGTH * GB_VIDEO_VERTICAL_TOTAL_PIXELS,
|
||||
};
|
||||
|
||||
struct GBVideoRenderer {
|
||||
void (*init)(struct GBVideoRenderer* renderer);
|
||||
void (*reset)(struct GBVideoRenderer* renderer);
|
||||
void (*deinit)(struct GBVideoRenderer* renderer);
|
||||
|
||||
uint8_t (*writeVideoRegister)(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value);
|
||||
void (*writeVRAM)(struct GBVideoRenderer* renderer, uint16_t address);
|
||||
void (*drawScanline)(struct GBVideoRenderer* renderer, int y);
|
||||
void (*finishFrame)(struct GBVideoRenderer* renderer);
|
||||
|
||||
void (*getPixels)(struct GBVideoRenderer* renderer, unsigned* stride, const void** pixels);
|
||||
void (*putPixels)(struct GBVideoRenderer* renderer, unsigned stride, void* pixels);
|
||||
|
||||
uint8_t* vram;
|
||||
};
|
||||
|
||||
DECL_BITFIELD(GBRegisterLCDC, uint8_t);
|
||||
DECL_BIT(GBRegisterLCDC, Enable, 7);
|
||||
|
||||
DECL_BITFIELD(GBRegisterSTAT, uint8_t);
|
||||
|
||||
struct GBVideo {
|
||||
struct GB* p;
|
||||
struct GBVideoRenderer* renderer;
|
||||
|
||||
int ly;
|
||||
int mode;
|
||||
|
||||
int32_t nextEvent;
|
||||
int32_t eventDiff;
|
||||
|
||||
int32_t nextMode;
|
||||
|
||||
uint8_t* vram;
|
||||
|
||||
int32_t frameCounter;
|
||||
int frameskip;
|
||||
int frameskipCounter;
|
||||
};
|
||||
|
||||
void GBVideoInit(struct GBVideo* video);
|
||||
void GBVideoReset(struct GBVideo* video);
|
||||
void GBVideoDeinit(struct GBVideo* video);
|
||||
void GBVideoAssociateRenderer(struct GBVideo* video, struct GBVideoRenderer* renderer);
|
||||
int32_t GBVideoProcessEvents(struct GBVideo* video, int32_t cycles);
|
||||
|
||||
void GBVideoWriteLCDC(struct GBVideo* video, GBRegisterLCDC value);
|
||||
void GBVideoWriteSTAT(struct GBVideo* video, GBRegisterSTAT value);
|
||||
|
||||
#endif
|
|
@ -69,8 +69,9 @@ void LR35902Reset(struct LR35902Core* cpu) {
|
|||
cpu->irqh.reset(cpu);
|
||||
}
|
||||
|
||||
void LR35902RaiseIRQ(struct LR35902Core* cpu) {
|
||||
// TODO
|
||||
void LR35902RaiseIRQ(struct LR35902Core* cpu, uint8_t vector) {
|
||||
cpu->irqPending = true;
|
||||
cpu->irqVector = vector;
|
||||
}
|
||||
|
||||
void LR35902Tick(struct LR35902Core* cpu) {
|
||||
|
@ -80,6 +81,12 @@ void LR35902Tick(struct LR35902Core* cpu) {
|
|||
cpu->executionState &= 3;
|
||||
switch (state) {
|
||||
case LR35902_CORE_FETCH:
|
||||
if (cpu->irqPending) {
|
||||
cpu->pc = cpu->irqVector;
|
||||
cpu->irqPending = false;
|
||||
cpu->irqh.setInterrupts(cpu, false);
|
||||
// TODO: stall
|
||||
}
|
||||
cpu->bus = cpu->memory.load8(cpu, cpu->pc);
|
||||
break;
|
||||
case LR35902_CORE_DECODE:
|
||||
|
|
|
@ -120,6 +120,9 @@ struct LR35902Core {
|
|||
bool condition;
|
||||
LR35902Instruction instruction;
|
||||
|
||||
bool irqPending;
|
||||
uint16_t irqVector;
|
||||
|
||||
struct LR35902Memory memory;
|
||||
struct LR35902InterruptHandler irqh;
|
||||
|
||||
|
@ -142,7 +145,7 @@ void LR35902HotplugAttach(struct LR35902Core* cpu, size_t slot);
|
|||
void LR35902HotplugDetach(struct LR35902Core* cpu, size_t slot);
|
||||
|
||||
void LR35902Reset(struct LR35902Core* cpu);
|
||||
void LR35902RaiseIRQ(struct LR35902Core*);
|
||||
void LR35902RaiseIRQ(struct LR35902Core* cpu, uint8_t vector);
|
||||
|
||||
void LR35902Tick(struct LR35902Core* cpu);
|
||||
|
||||
|
|
Loading…
Reference in New Issue