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->nextHblankIRQ = 0;
85 video->nextVblankIRQ = 0;
86 video->nextVcounterIRQ = 0;
87
88 video->frameCounter = 0;
89 video->frameskipCounter = 0;
90
91 if (video->vram) {
92 mappedMemoryFree(video->vram, SIZE_VRAM);
93 }
94 video->vram = anonymousMemoryMap(SIZE_VRAM);
95 video->renderer->vram = video->vram;
96
97 memset(video->palette, 0, sizeof(video->palette));
98 memset(video->oam.raw, 0, sizeof(video->oam.raw));
99
100 video->renderer->deinit(video->renderer);
101 video->renderer->init(video->renderer);
102}
103
104void GBAVideoDeinit(struct GBAVideo* video) {
105 GBAVideoAssociateRenderer(video, &dummyRenderer);
106 mappedMemoryFree(video->vram, SIZE_VRAM);
107}
108
109void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer) {
110 video->renderer->deinit(video->renderer);
111 renderer->cache = video->renderer->cache;
112 video->renderer = renderer;
113 renderer->palette = video->palette;
114 renderer->vram = video->vram;
115 renderer->oam = &video->oam;
116 video->renderer->init(video->renderer);
117}
118
119int32_t GBAVideoProcessEvents(struct GBAVideo* video, int32_t cycles) {
120 video->nextEvent -= cycles;
121 video->eventDiff += cycles;
122 if (video->nextEvent <= 0) {
123 int32_t lastEvent = video->nextEvent;
124 video->nextHblank -= video->eventDiff;
125 video->nextHblankIRQ -= video->eventDiff;
126 video->nextVcounterIRQ -= video->eventDiff;
127 video->eventDiff = 0;
128 uint16_t dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
129
130 if (GBARegisterDISPSTATIsInHblank(dispstat)) {
131 // End Hblank
132 dispstat = GBARegisterDISPSTATClearInHblank(dispstat);
133 video->nextEvent = video->nextHblank;
134
135 ++video->vcount;
136 if (video->vcount == VIDEO_VERTICAL_TOTAL_PIXELS) {
137 video->vcount = 0;
138 }
139 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
140
141 if (video->vcount == GBARegisterDISPSTATGetVcountSetting(dispstat)) {
142 dispstat = GBARegisterDISPSTATFillVcounter(dispstat);
143 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
144 GBARaiseIRQ(video->p, IRQ_VCOUNTER);
145 video->nextVcounterIRQ += VIDEO_TOTAL_LENGTH;
146 }
147 } else {
148 dispstat = GBARegisterDISPSTATClearVcounter(dispstat);
149 }
150 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
151
152 // Note: state may be recorded during callbacks, so ensure it is consistent!
153 switch (video->vcount) {
154 case 0:
155 GBAFrameStarted(video->p);
156 break;
157 case VIDEO_VERTICAL_PIXELS:
158 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATFillInVblank(dispstat);
159 if (video->frameskipCounter <= 0) {
160 video->renderer->finishFrame(video->renderer);
161 }
162 video->nextVblankIRQ = video->nextEvent + VIDEO_TOTAL_LENGTH;
163 GBAMemoryRunVblankDMAs(video->p, lastEvent);
164 if (GBARegisterDISPSTATIsVblankIRQ(dispstat)) {
165 GBARaiseIRQ(video->p, IRQ_VBLANK);
166 }
167 GBAFrameEnded(video->p);
168 --video->frameskipCounter;
169 if (video->frameskipCounter < 0) {
170 mCoreSyncPostFrame(video->p->sync);
171 video->frameskipCounter = video->frameskip;
172 }
173 ++video->frameCounter;
174 break;
175 case VIDEO_VERTICAL_TOTAL_PIXELS - 1:
176 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATClearInVblank(dispstat);
177 break;
178 }
179 } else {
180 // Begin Hblank
181 dispstat = GBARegisterDISPSTATFillInHblank(dispstat);
182 video->nextEvent = video->nextHblank + VIDEO_HBLANK_LENGTH;
183 video->nextHblank = video->nextEvent + VIDEO_HDRAW_LENGTH;
184 video->nextHblankIRQ = video->nextHblank;
185
186 if (video->vcount < VIDEO_VERTICAL_PIXELS && video->frameskipCounter <= 0) {
187 video->renderer->drawScanline(video->renderer, video->vcount);
188 }
189
190 if (video->vcount < VIDEO_VERTICAL_PIXELS) {
191 GBAMemoryRunHblankDMAs(video->p, lastEvent);
192 }
193 if (GBARegisterDISPSTATIsHblankIRQ(dispstat)) {
194 GBARaiseIRQ(video->p, IRQ_HBLANK);
195 }
196 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
197 }
198 }
199 return video->nextEvent;
200}
201
202void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value) {
203 video->p->memory.io[REG_DISPSTAT >> 1] &= 0x7;
204 video->p->memory.io[REG_DISPSTAT >> 1] |= value;
205
206 uint16_t dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
207
208 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
209 // FIXME: this can be too late if we're in the middle of an Hblank
210 video->nextVcounterIRQ = video->nextHblank + VIDEO_HBLANK_LENGTH + (GBARegisterDISPSTATGetVcountSetting(dispstat) - video->vcount) * VIDEO_HORIZONTAL_LENGTH;
211 if (video->nextVcounterIRQ < video->nextEvent) {
212 video->nextVcounterIRQ += VIDEO_TOTAL_LENGTH;
213 }
214 }
215}
216
217static void GBAVideoDummyRendererInit(struct GBAVideoRenderer* renderer) {
218 UNUSED(renderer);
219 // Nothing to do
220}
221
222static void GBAVideoDummyRendererReset(struct GBAVideoRenderer* renderer) {
223 UNUSED(renderer);
224 // Nothing to do
225}
226
227static void GBAVideoDummyRendererDeinit(struct GBAVideoRenderer* renderer) {
228 UNUSED(renderer);
229 // Nothing to do
230}
231
232static uint16_t GBAVideoDummyRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
233 UNUSED(renderer);
234 switch (address) {
235 case REG_BG0CNT:
236 case REG_BG1CNT:
237 value &= 0xDFFF;
238 break;
239 case REG_BG2CNT:
240 case REG_BG3CNT:
241 value &= 0xFFFF;
242 break;
243 case REG_BG0HOFS:
244 case REG_BG0VOFS:
245 case REG_BG1HOFS:
246 case REG_BG1VOFS:
247 case REG_BG2HOFS:
248 case REG_BG2VOFS:
249 case REG_BG3HOFS:
250 case REG_BG3VOFS:
251 value &= 0x01FF;
252 break;
253 case REG_BLDCNT:
254 value &= 0x3FFF;
255 break;
256 case REG_BLDALPHA:
257 value &= 0x1F1F;
258 break;
259 case REG_WININ:
260 case REG_WINOUT:
261 value &= 0x3F3F;
262 break;
263 default:
264 break;
265 }
266 return value;
267}
268
269static void GBAVideoDummyRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address) {
270 if (renderer->cache) {
271 GBAVideoTileCacheWriteVRAM(renderer->cache, address);
272 }
273}
274
275static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
276 UNUSED(value);
277 if (renderer->cache) {
278 GBAVideoTileCacheWritePalette(renderer->cache, address);
279 }
280}
281
282static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam) {
283 UNUSED(renderer);
284 UNUSED(oam);
285 // Nothing to do
286}
287
288static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y) {
289 UNUSED(renderer);
290 UNUSED(y);
291 // Nothing to do
292}
293
294static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer) {
295 UNUSED(renderer);
296 // Nothing to do
297}
298
299static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels) {
300 UNUSED(renderer);
301 UNUSED(stride);
302 UNUSED(pixels);
303 // Nothing to do
304}
305
306static void GBAVideoDummyRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels) {
307 UNUSED(renderer);
308 UNUSED(stride);
309 UNUSED(pixels);
310 // Nothing to do
311}
312
313void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state) {
314 memcpy(state->vram, video->renderer->vram, SIZE_VRAM);
315 memcpy(state->oam, video->oam.raw, SIZE_OAM);
316 memcpy(state->pram, video->palette, SIZE_PALETTE_RAM);
317 STORE_32(video->nextEvent, 0, &state->video.nextEvent);
318 STORE_32(video->eventDiff, 0, &state->video.eventDiff);
319 STORE_32(video->nextHblank, 0, &state->video.nextHblank);
320 STORE_32(video->nextHblankIRQ, 0, &state->video.nextHblankIRQ);
321 STORE_32(video->nextVblankIRQ, 0, &state->video.nextVblankIRQ);
322 STORE_32(video->nextVcounterIRQ, 0, &state->video.nextVcounterIRQ);
323 STORE_32(video->frameCounter, 0, &state->video.frameCounter);
324}
325
326void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state) {
327 memcpy(video->renderer->vram, state->vram, SIZE_VRAM);
328 uint16_t value;
329 int i;
330 for (i = 0; i < SIZE_OAM; i += 2) {
331 LOAD_16(value, i, state->oam);
332 GBAStore16(video->p->cpu, BASE_OAM | i, value, 0);
333 }
334 for (i = 0; i < SIZE_PALETTE_RAM; i += 2) {
335 LOAD_16(value, i, state->pram);
336 GBAStore16(video->p->cpu, BASE_PALETTE_RAM | i, value, 0);
337 }
338 LOAD_32(video->nextEvent, 0, &state->video.nextEvent);
339 LOAD_32(video->eventDiff, 0, &state->video.eventDiff);
340 LOAD_32(video->nextHblank, 0, &state->video.nextHblank);
341 LOAD_32(video->nextHblankIRQ, 0, &state->video.nextHblankIRQ);
342 LOAD_32(video->nextVblankIRQ, 0, &state->video.nextVblankIRQ);
343 LOAD_32(video->nextVcounterIRQ, 0, &state->video.nextVcounterIRQ);
344 LOAD_32(video->frameCounter, 0, &state->video.frameCounter);
345 LOAD_16(video->vcount, REG_VCOUNT, state->io);
346 video->renderer->reset(video->renderer);
347}