src/gba/video.c (view raw)
1/* Copyright (c) 2013-2015 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 "video.h"
7
8#include "core/sync.h"
9#include "gba/gba.h"
10#include "gba/io.h"
11#include "gba/renderers/tile-cache.h"
12#include "gba/rr/rr.h"
13#include "gba/serialize.h"
14
15#include "util/memory.h"
16
17mLOG_DEFINE_CATEGORY(GBA_VIDEO, "GBA Video");
18
19static void GBAVideoDummyRendererInit(struct GBAVideoRenderer* renderer);
20static void GBAVideoDummyRendererReset(struct GBAVideoRenderer* renderer);
21static void GBAVideoDummyRendererDeinit(struct GBAVideoRenderer* renderer);
22static uint16_t GBAVideoDummyRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
23static void GBAVideoDummyRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address);
24static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
25static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam);
26static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y);
27static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer);
28static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels);
29static void GBAVideoDummyRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels);
30
31const int GBAVideoObjSizes[16][2] = {
32 { 8, 8 },
33 { 16, 16 },
34 { 32, 32 },
35 { 64, 64 },
36 { 16, 8 },
37 { 32, 8 },
38 { 32, 16 },
39 { 64, 32 },
40 { 8, 16 },
41 { 8, 32 },
42 { 16, 32 },
43 { 32, 64 },
44 { 0, 0 },
45 { 0, 0 },
46 { 0, 0 },
47 { 0, 0 },
48};
49
50static struct GBAVideoRenderer dummyRenderer = {
51 .init = GBAVideoDummyRendererInit,
52 .reset = GBAVideoDummyRendererReset,
53 .deinit = GBAVideoDummyRendererDeinit,
54 .writeVideoRegister = GBAVideoDummyRendererWriteVideoRegister,
55 .writeVRAM = GBAVideoDummyRendererWriteVRAM,
56 .writePalette = GBAVideoDummyRendererWritePalette,
57 .writeOAM = GBAVideoDummyRendererWriteOAM,
58 .drawScanline = GBAVideoDummyRendererDrawScanline,
59 .finishFrame = GBAVideoDummyRendererFinishFrame,
60 .getPixels = GBAVideoDummyRendererGetPixels,
61 .putPixels = GBAVideoDummyRendererPutPixels,
62 .cache = NULL
63};
64
65void GBAVideoInit(struct GBAVideo* video) {
66 video->renderer = &dummyRenderer;
67 video->vram = 0;
68 video->frameskip = 0;
69}
70
71void GBAVideoReset(struct GBAVideo* video) {
72 if (video->p->memory.fullBios) {
73 video->vcount = 0;
74 } else {
75 // TODO: Verify exact scanline hardware
76 video->vcount = 0x7E;
77 }
78 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
79
80 video->nextHblank = VIDEO_HDRAW_LENGTH;
81 video->nextEvent = video->nextHblank;
82 video->eventDiff = 0;
83
84 video->frameCounter = 0;
85 video->frameskipCounter = 0;
86
87 if (video->vram) {
88 mappedMemoryFree(video->vram, SIZE_VRAM);
89 }
90 video->vram = anonymousMemoryMap(SIZE_VRAM);
91 video->renderer->vram = video->vram;
92
93 memset(video->palette, 0, sizeof(video->palette));
94 memset(video->oam.raw, 0, sizeof(video->oam.raw));
95
96 video->renderer->deinit(video->renderer);
97 video->renderer->init(video->renderer);
98}
99
100void GBAVideoDeinit(struct GBAVideo* video) {
101 GBAVideoAssociateRenderer(video, &dummyRenderer);
102 mappedMemoryFree(video->vram, SIZE_VRAM);
103}
104
105void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer) {
106 video->renderer->deinit(video->renderer);
107 renderer->cache = video->renderer->cache;
108 video->renderer = renderer;
109 renderer->palette = video->palette;
110 renderer->vram = video->vram;
111 renderer->oam = &video->oam;
112 video->renderer->init(video->renderer);
113}
114
115int32_t GBAVideoProcessEvents(struct GBAVideo* video, int32_t cycles) {
116 video->nextEvent -= cycles;
117 video->eventDiff += cycles;
118 if (video->nextEvent <= 0) {
119 int32_t lastEvent = video->nextEvent;
120 video->nextHblank -= video->eventDiff;
121 video->eventDiff = 0;
122 uint16_t dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
123
124 if (GBARegisterDISPSTATIsInHblank(dispstat)) {
125 // End Hblank
126 dispstat = GBARegisterDISPSTATClearInHblank(dispstat);
127 video->nextEvent = video->nextHblank;
128
129 ++video->vcount;
130 if (video->vcount == VIDEO_VERTICAL_TOTAL_PIXELS) {
131 video->vcount = 0;
132 }
133 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
134
135 if (video->vcount == GBARegisterDISPSTATGetVcountSetting(dispstat)) {
136 dispstat = GBARegisterDISPSTATFillVcounter(dispstat);
137 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
138 GBARaiseIRQ(video->p, IRQ_VCOUNTER);
139 }
140 } else {
141 dispstat = GBARegisterDISPSTATClearVcounter(dispstat);
142 }
143 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
144
145 // Note: state may be recorded during callbacks, so ensure it is consistent!
146 switch (video->vcount) {
147 case 0:
148 GBAFrameStarted(video->p);
149 break;
150 case VIDEO_VERTICAL_PIXELS:
151 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATFillInVblank(dispstat);
152 if (video->frameskipCounter <= 0) {
153 video->renderer->finishFrame(video->renderer);
154 }
155 GBAMemoryRunVblankDMAs(video->p, lastEvent);
156 if (GBARegisterDISPSTATIsVblankIRQ(dispstat)) {
157 GBARaiseIRQ(video->p, IRQ_VBLANK);
158 }
159 GBAFrameEnded(video->p);
160 --video->frameskipCounter;
161 if (video->frameskipCounter < 0) {
162 mCoreSyncPostFrame(video->p->sync);
163 video->frameskipCounter = video->frameskip;
164 }
165 ++video->frameCounter;
166 break;
167 case VIDEO_VERTICAL_TOTAL_PIXELS - 1:
168 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATClearInVblank(dispstat);
169 break;
170 }
171 } else {
172 // Begin Hblank
173 dispstat = GBARegisterDISPSTATFillInHblank(dispstat);
174 video->nextEvent = video->nextHblank + VIDEO_HBLANK_LENGTH;
175 video->nextHblank = video->nextEvent + VIDEO_HDRAW_LENGTH;
176
177 if (video->vcount < VIDEO_VERTICAL_PIXELS && video->frameskipCounter <= 0) {
178 video->renderer->drawScanline(video->renderer, video->vcount);
179 }
180
181 if (video->vcount < VIDEO_VERTICAL_PIXELS) {
182 GBAMemoryRunHblankDMAs(video->p, lastEvent);
183 }
184 if (GBARegisterDISPSTATIsHblankIRQ(dispstat)) {
185 GBARaiseIRQ(video->p, IRQ_HBLANK);
186 }
187 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
188 }
189 }
190 return video->nextEvent;
191}
192
193void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value) {
194 video->p->memory.io[REG_DISPSTAT >> 1] &= 0x7;
195 video->p->memory.io[REG_DISPSTAT >> 1] |= value;
196 // TODO: Does a VCounter IRQ trigger on write?
197}
198
199static void GBAVideoDummyRendererInit(struct GBAVideoRenderer* renderer) {
200 UNUSED(renderer);
201 // Nothing to do
202}
203
204static void GBAVideoDummyRendererReset(struct GBAVideoRenderer* renderer) {
205 UNUSED(renderer);
206 // Nothing to do
207}
208
209static void GBAVideoDummyRendererDeinit(struct GBAVideoRenderer* renderer) {
210 UNUSED(renderer);
211 // Nothing to do
212}
213
214static uint16_t GBAVideoDummyRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
215 UNUSED(renderer);
216 switch (address) {
217 case REG_BG0CNT:
218 case REG_BG1CNT:
219 value &= 0xDFFF;
220 break;
221 case REG_BG2CNT:
222 case REG_BG3CNT:
223 value &= 0xFFFF;
224 break;
225 case REG_BG0HOFS:
226 case REG_BG0VOFS:
227 case REG_BG1HOFS:
228 case REG_BG1VOFS:
229 case REG_BG2HOFS:
230 case REG_BG2VOFS:
231 case REG_BG3HOFS:
232 case REG_BG3VOFS:
233 value &= 0x01FF;
234 break;
235 case REG_BLDCNT:
236 value &= 0x3FFF;
237 break;
238 case REG_BLDALPHA:
239 value &= 0x1F1F;
240 break;
241 case REG_WININ:
242 case REG_WINOUT:
243 value &= 0x3F3F;
244 break;
245 default:
246 break;
247 }
248 return value;
249}
250
251static void GBAVideoDummyRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address) {
252 if (renderer->cache) {
253 GBAVideoTileCacheWriteVRAM(renderer->cache, address);
254 }
255}
256
257static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
258 UNUSED(value);
259 if (renderer->cache) {
260 GBAVideoTileCacheWritePalette(renderer->cache, address);
261 }
262}
263
264static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam) {
265 UNUSED(renderer);
266 UNUSED(oam);
267 // Nothing to do
268}
269
270static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y) {
271 UNUSED(renderer);
272 UNUSED(y);
273 // Nothing to do
274}
275
276static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer) {
277 UNUSED(renderer);
278 // Nothing to do
279}
280
281static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels) {
282 UNUSED(renderer);
283 UNUSED(stride);
284 UNUSED(pixels);
285 // Nothing to do
286}
287
288static void GBAVideoDummyRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels) {
289 UNUSED(renderer);
290 UNUSED(stride);
291 UNUSED(pixels);
292 // Nothing to do
293}
294
295void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state) {
296 memcpy(state->vram, video->renderer->vram, SIZE_VRAM);
297 memcpy(state->oam, video->oam.raw, SIZE_OAM);
298 memcpy(state->pram, video->palette, SIZE_PALETTE_RAM);
299 STORE_32(video->nextEvent, 0, &state->video.nextEvent);
300 STORE_32(video->eventDiff, 0, &state->video.eventDiff);
301 STORE_32(video->nextHblank, 0, &state->video.nextHblank);
302 STORE_32(video->frameCounter, 0, &state->video.frameCounter);
303}
304
305void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state) {
306 memcpy(video->renderer->vram, state->vram, SIZE_VRAM);
307 uint16_t value;
308 int i;
309 for (i = 0; i < SIZE_OAM; i += 2) {
310 LOAD_16(value, i, state->oam);
311 GBAStore16(video->p->cpu, BASE_OAM | i, value, 0);
312 }
313 for (i = 0; i < SIZE_PALETTE_RAM; i += 2) {
314 LOAD_16(value, i, state->pram);
315 GBAStore16(video->p->cpu, BASE_PALETTE_RAM | i, value, 0);
316 }
317 LOAD_32(video->nextEvent, 0, &state->video.nextEvent);
318 LOAD_32(video->eventDiff, 0, &state->video.eventDiff);
319 LOAD_32(video->nextHblank, 0, &state->video.nextHblank);
320 LOAD_32(video->frameCounter, 0, &state->video.frameCounter);
321 LOAD_16(video->vcount, REG_VCOUNT, state->io);
322 video->renderer->reset(video->renderer);
323}