1/* Copyright (c) 2013-2016 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#include "core.h"
  7
  8#include "core/core.h"
  9#include "gb/gb.h"
 10#include "gb/renderers/software.h"
 11#include "util/memory.h"
 12
 13struct GBCore {
 14	struct mCore d;
 15	struct GBVideoSoftwareRenderer renderer;
 16	uint8_t keys;
 17};
 18
 19static bool _GBCoreInit(struct mCore* core) {
 20	struct GBCore* gbcore = (struct GBCore*) core;
 21
 22	struct LR35902Core* cpu = anonymousMemoryMap(sizeof(struct LR35902Core));
 23	struct GB* gb = anonymousMemoryMap(sizeof(struct GB));
 24	if (!cpu || !gb) {
 25		free(cpu);
 26		free(gb);
 27		return false;
 28	}
 29	core->cpu = cpu;
 30	core->board = gb;
 31
 32	GBCreate(gb);
 33	LR35902SetComponents(cpu, &gb->d, 0, 0);
 34	LR35902Init(cpu);
 35
 36	GBVideoSoftwareRendererCreate(&gbcore->renderer);
 37	GBVideoAssociateRenderer(&gb->video, &gbcore->renderer.d);
 38
 39	gb->keySource = &gbcore->keys;
 40	
 41	return true;
 42}
 43
 44static void _GBCoreDeinit(struct mCore* core) {
 45	LR35902Deinit(core->cpu);
 46	GBDestroy(core->board);
 47	mappedMemoryFree(core->cpu, sizeof(struct LR35902Core));
 48	mappedMemoryFree(core->board, sizeof(struct GB));
 49}
 50
 51static void _GBCoreDesiredVideoDimensions(struct mCore* core, unsigned* width, unsigned* height) {
 52	UNUSED(core);
 53	*width = GB_VIDEO_HORIZONTAL_PIXELS;
 54	*height = GB_VIDEO_VERTICAL_PIXELS;
 55}
 56
 57static void _GBCoreSetVideoBuffer(struct mCore* core, color_t* buffer, size_t stride) {
 58	struct GBCore* gbcore = (struct GBCore*) core;
 59	gbcore->renderer.outputBuffer = buffer;
 60	gbcore->renderer.outputBufferStride = stride;
 61}
 62
 63static bool _GBCoreLoadROM(struct mCore* core, struct VFile* vf, struct VFile* save, const char* fname) {
 64	return GBLoadROM(core->board, vf, save, fname);
 65}
 66
 67static bool _GBCoreIsROM(struct mCore* core, struct VFile* vf) {
 68	UNUSED(core);
 69	return GBIsROM(vf);
 70}
 71
 72static void _GBCoreUnloadROM(struct mCore* core) {
 73	return GBUnloadROM(core->board);
 74}
 75
 76static void _GBCoreReset(struct mCore* core) {
 77	LR35902Reset(core->cpu);
 78}
 79
 80static void _GBCoreRunFrame(struct mCore* core) {
 81	struct GB* gb = core->board;
 82	int32_t frameCounter = gb->video.frameCounter;
 83	while (gb->video.frameCounter == frameCounter) {
 84		LR35902Run(core->cpu);
 85	}
 86}
 87
 88static void _GBCoreRunLoop(struct mCore* core) {
 89	LR35902Run(core->cpu);
 90}
 91
 92static void _GBCoreStep(struct mCore* core) {
 93	LR35902Tick(core->cpu);
 94}
 95
 96static void _GBCoreSetKeys(struct mCore* core, uint32_t keys) {
 97	struct GBCore* gbcore = (struct GBCore*) core;
 98	gbcore->keys = keys;
 99}
100
101static void _GBCoreAddKeys(struct mCore* core, uint32_t keys) {
102	struct GBCore* gbcore = (struct GBCore*) core;
103	gbcore->keys |= keys;
104}
105
106static void _GBCoreClearKeys(struct mCore* core, uint32_t keys) {
107	struct GBCore* gbcore = (struct GBCore*) core;
108	gbcore->keys &= ~keys;
109}
110
111static int32_t _GBCoreFrameCounter(struct mCore* core) {
112	struct GB* gb = core->board;
113	return gb->video.frameCounter;
114}
115
116static int32_t _GBCoreFrameCycles(struct mCore* core) {
117	UNUSED(core);
118	return GB_VIDEO_TOTAL_LENGTH;
119}
120
121static int32_t _GBCoreFrequency(struct mCore* core) {
122	UNUSED(core);
123	// TODO: GB differences
124	return DMG_LR35902_FREQUENCY;
125}
126
127static void _GBCoreSetRTC(struct mCore* core, struct mRTCSource* rtc) {
128	struct GB* gb = core->board;
129	gb->memory.rtc = rtc;
130}
131
132struct mCore* GBCoreCreate(void) {
133	struct GBCore* gbcore = malloc(sizeof(*gbcore));
134	struct mCore* core = &gbcore->d;
135	core->cpu = 0;
136	core->board = 0;
137	core->init = _GBCoreInit;
138	core->deinit = _GBCoreDeinit;
139	core->desiredVideoDimensions = _GBCoreDesiredVideoDimensions;
140	core->setVideoBuffer = _GBCoreSetVideoBuffer;
141	core->isROM = _GBCoreIsROM;
142	core->loadROM = _GBCoreLoadROM;
143	core->unloadROM = _GBCoreUnloadROM;
144	core->reset = _GBCoreReset;
145	core->runFrame = _GBCoreRunFrame;
146	core->runLoop = _GBCoreRunLoop;
147	core->step = _GBCoreStep;
148	core->setKeys = _GBCoreSetKeys;
149	core->addKeys = _GBCoreAddKeys;
150	core->clearKeys = _GBCoreClearKeys;
151	core->frameCounter = _GBCoreFrameCounter;
152	core->frameCycles = _GBCoreFrameCycles;
153	core->frequency = _GBCoreFrequency;
154	core->setRTC = _GBCoreSetRTC;
155	return core;
156}