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, unsigned* stride, const void** pixels);
29
30const int GBAVideoObjSizes[16][2] = {
31 { 8, 8 },
32 { 16, 16 },
33 { 32, 32 },
34 { 64, 64 },
35 { 16, 8 },
36 { 32, 8 },
37 { 32, 16 },
38 { 64, 32 },
39 { 8, 16 },
40 { 8, 32 },
41 { 16, 32 },
42 { 32, 64 },
43 { 0, 0 },
44 { 0, 0 },
45 { 0, 0 },
46 { 0, 0 },
47};
48
49static struct GBAVideoRenderer dummyRenderer = {
50 .init = GBAVideoDummyRendererInit,
51 .reset = GBAVideoDummyRendererReset,
52 .deinit = GBAVideoDummyRendererDeinit,
53 .writeVideoRegister = GBAVideoDummyRendererWriteVideoRegister,
54 .writeVRAM = GBAVideoDummyRendererWriteVRAM,
55 .writePalette = GBAVideoDummyRendererWritePalette,
56 .writeOAM = GBAVideoDummyRendererWriteOAM,
57 .drawScanline = GBAVideoDummyRendererDrawScanline,
58 .finishFrame = GBAVideoDummyRendererFinishFrame,
59 .getPixels = GBAVideoDummyRendererGetPixels,
60 .cache = NULL
61};
62
63void GBAVideoInit(struct GBAVideo* video) {
64 video->renderer = &dummyRenderer;
65 video->vram = 0;
66 video->frameskip = 0;
67}
68
69void GBAVideoReset(struct GBAVideo* video) {
70 if (video->p->memory.fullBios) {
71 video->vcount = 0;
72 } else {
73 // TODO: Verify exact scanline hardware
74 video->vcount = 0x7E;
75 }
76 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
77
78 video->nextHblank = VIDEO_HDRAW_LENGTH;
79 video->nextEvent = video->nextHblank;
80 video->eventDiff = 0;
81
82 video->nextHblankIRQ = 0;
83 video->nextVblankIRQ = 0;
84 video->nextVcounterIRQ = 0;
85
86 video->frameCounter = 0;
87 video->frameskipCounter = 0;
88
89 if (video->vram) {
90 mappedMemoryFree(video->vram, SIZE_VRAM);
91 }
92 video->vram = anonymousMemoryMap(SIZE_VRAM);
93 video->renderer->vram = video->vram;
94
95 memset(video->palette, 0, sizeof(video->palette));
96 memset(video->oam.raw, 0, sizeof(video->oam.raw));
97
98 video->renderer->deinit(video->renderer);
99 video->renderer->init(video->renderer);
100}
101
102void GBAVideoDeinit(struct GBAVideo* video) {
103 GBAVideoAssociateRenderer(video, &dummyRenderer);
104 mappedMemoryFree(video->vram, SIZE_VRAM);
105}
106
107void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer) {
108 video->renderer->deinit(video->renderer);
109 renderer->cache = video->renderer->cache;
110 video->renderer = renderer;
111 renderer->palette = video->palette;
112 renderer->vram = video->vram;
113 renderer->oam = &video->oam;
114 video->renderer->init(video->renderer);
115}
116
117int32_t GBAVideoProcessEvents(struct GBAVideo* video, int32_t cycles) {
118 video->nextEvent -= cycles;
119 video->eventDiff += cycles;
120 if (video->nextEvent <= 0) {
121 int32_t lastEvent = video->nextEvent;
122 video->nextHblank -= video->eventDiff;
123 video->nextHblankIRQ -= video->eventDiff;
124 video->nextVcounterIRQ -= video->eventDiff;
125 video->eventDiff = 0;
126 uint16_t dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
127
128 if (GBARegisterDISPSTATIsInHblank(dispstat)) {
129 // End Hblank
130 dispstat = GBARegisterDISPSTATClearInHblank(dispstat);
131 video->nextEvent = video->nextHblank;
132
133 ++video->vcount;
134 if (video->vcount == VIDEO_VERTICAL_TOTAL_PIXELS) {
135 video->vcount = 0;
136 }
137 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
138
139 if (video->vcount == GBARegisterDISPSTATGetVcountSetting(dispstat)) {
140 dispstat = GBARegisterDISPSTATFillVcounter(dispstat);
141 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
142 GBARaiseIRQ(video->p, IRQ_VCOUNTER);
143 video->nextVcounterIRQ += VIDEO_TOTAL_LENGTH;
144 }
145 } else {
146 dispstat = GBARegisterDISPSTATClearVcounter(dispstat);
147 }
148 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
149
150 // Note: state may be recorded during callbacks, so ensure it is consistent!
151 switch (video->vcount) {
152 case 0:
153 GBAFrameStarted(video->p);
154 break;
155 case VIDEO_VERTICAL_PIXELS:
156 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATFillInVblank(dispstat);
157 if (video->frameskipCounter <= 0) {
158 video->renderer->finishFrame(video->renderer);
159 }
160 video->nextVblankIRQ = video->nextEvent + VIDEO_TOTAL_LENGTH;
161 GBAMemoryRunVblankDMAs(video->p, lastEvent);
162 if (GBARegisterDISPSTATIsVblankIRQ(dispstat)) {
163 GBARaiseIRQ(video->p, IRQ_VBLANK);
164 }
165 GBAFrameEnded(video->p);
166 --video->frameskipCounter;
167 if (video->frameskipCounter < 0) {
168 mCoreSyncPostFrame(video->p->sync);
169 video->frameskipCounter = video->frameskip;
170 }
171 ++video->frameCounter;
172 break;
173 case VIDEO_VERTICAL_TOTAL_PIXELS - 1:
174 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATClearInVblank(dispstat);
175 break;
176 }
177 } else {
178 // Begin Hblank
179 dispstat = GBARegisterDISPSTATFillInHblank(dispstat);
180 video->nextEvent = video->nextHblank + VIDEO_HBLANK_LENGTH;
181 video->nextHblank = video->nextEvent + VIDEO_HDRAW_LENGTH;
182 video->nextHblankIRQ = video->nextHblank;
183
184 if (video->vcount < VIDEO_VERTICAL_PIXELS && video->frameskipCounter <= 0) {
185 video->renderer->drawScanline(video->renderer, video->vcount);
186 }
187
188 if (video->vcount < VIDEO_VERTICAL_PIXELS) {
189 GBAMemoryRunHblankDMAs(video->p, lastEvent);
190 }
191 if (GBARegisterDISPSTATIsHblankIRQ(dispstat)) {
192 GBARaiseIRQ(video->p, IRQ_HBLANK);
193 }
194 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
195 }
196 }
197 return video->nextEvent;
198}
199
200void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value) {
201 video->p->memory.io[REG_DISPSTAT >> 1] &= 0x7;
202 video->p->memory.io[REG_DISPSTAT >> 1] |= value;
203
204 uint16_t dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
205
206 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
207 // FIXME: this can be too late if we're in the middle of an Hblank
208 video->nextVcounterIRQ = video->nextHblank + VIDEO_HBLANK_LENGTH + (GBARegisterDISPSTATGetVcountSetting(dispstat) - video->vcount) * VIDEO_HORIZONTAL_LENGTH;
209 if (video->nextVcounterIRQ < video->nextEvent) {
210 video->nextVcounterIRQ += VIDEO_TOTAL_LENGTH;
211 }
212 }
213}
214
215static void GBAVideoDummyRendererInit(struct GBAVideoRenderer* renderer) {
216 UNUSED(renderer);
217 // Nothing to do
218}
219
220static void GBAVideoDummyRendererReset(struct GBAVideoRenderer* renderer) {
221 UNUSED(renderer);
222 // Nothing to do
223}
224
225static void GBAVideoDummyRendererDeinit(struct GBAVideoRenderer* renderer) {
226 UNUSED(renderer);
227 // Nothing to do
228}
229
230static uint16_t GBAVideoDummyRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
231 UNUSED(renderer);
232 switch (address) {
233 case REG_BG0CNT:
234 case REG_BG1CNT:
235 value &= 0xDFFF;
236 break;
237 case REG_BG2CNT:
238 case REG_BG3CNT:
239 value &= 0xFFFF;
240 break;
241 case REG_BG0HOFS:
242 case REG_BG0VOFS:
243 case REG_BG1HOFS:
244 case REG_BG1VOFS:
245 case REG_BG2HOFS:
246 case REG_BG2VOFS:
247 case REG_BG3HOFS:
248 case REG_BG3VOFS:
249 value &= 0x01FF;
250 break;
251 case REG_BLDCNT:
252 value &= 0x3FFF;
253 break;
254 case REG_BLDALPHA:
255 value &= 0x1F1F;
256 break;
257 case REG_WININ:
258 case REG_WINOUT:
259 value &= 0x3F3F;
260 break;
261 default:
262 break;
263 }
264 return value;
265}
266
267static void GBAVideoDummyRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address) {
268 if (renderer->cache) {
269 GBAVideoTileCacheWriteVRAM(renderer->cache, address);
270 }
271}
272
273static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
274 UNUSED(value);
275 if (renderer->cache) {
276 GBAVideoTileCacheWritePalette(renderer->cache, address);
277 }
278}
279
280static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam) {
281 UNUSED(renderer);
282 UNUSED(oam);
283 // Nothing to do
284}
285
286static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y) {
287 UNUSED(renderer);
288 UNUSED(y);
289 // Nothing to do
290}
291
292static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer) {
293 UNUSED(renderer);
294 // Nothing to do
295}
296
297static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels) {
298 UNUSED(renderer);
299 UNUSED(stride);
300 UNUSED(pixels);
301 // Nothing to do
302}
303
304void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state) {
305 memcpy(state->vram, video->renderer->vram, SIZE_VRAM);
306 memcpy(state->oam, video->oam.raw, SIZE_OAM);
307 memcpy(state->pram, video->palette, SIZE_PALETTE_RAM);
308 STORE_32(video->nextEvent, 0, &state->video.nextEvent);
309 STORE_32(video->eventDiff, 0, &state->video.eventDiff);
310 STORE_32(video->nextHblank, 0, &state->video.nextHblank);
311 STORE_32(video->nextHblankIRQ, 0, &state->video.nextHblankIRQ);
312 STORE_32(video->nextVblankIRQ, 0, &state->video.nextVblankIRQ);
313 STORE_32(video->nextVcounterIRQ, 0, &state->video.nextVcounterIRQ);
314 STORE_32(video->frameCounter, 0, &state->video.frameCounter);
315}
316
317void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state) {
318 memcpy(video->renderer->vram, state->vram, SIZE_VRAM);
319 uint16_t value;
320 int i;
321 for (i = 0; i < SIZE_OAM; i += 2) {
322 LOAD_16(value, i, state->oam);
323 GBAStore16(video->p->cpu, BASE_OAM | i, value, 0);
324 }
325 for (i = 0; i < SIZE_PALETTE_RAM; i += 2) {
326 LOAD_16(value, i, state->pram);
327 GBAStore16(video->p->cpu, BASE_PALETTE_RAM | i, value, 0);
328 }
329 LOAD_32(video->nextEvent, 0, &state->video.nextEvent);
330 LOAD_32(video->eventDiff, 0, &state->video.eventDiff);
331 LOAD_32(video->nextHblank, 0, &state->video.nextHblank);
332 LOAD_32(video->nextHblankIRQ, 0, &state->video.nextHblankIRQ);
333 LOAD_32(video->nextVblankIRQ, 0, &state->video.nextVblankIRQ);
334 LOAD_32(video->nextVcounterIRQ, 0, &state->video.nextVcounterIRQ);
335 LOAD_32(video->frameCounter, 0, &state->video.frameCounter);
336 LOAD_16(video->vcount, REG_VCOUNT, state->io);
337 video->renderer->reset(video->renderer);
338}