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 "core/tile-cache.h"
10#include "gba/gba.h"
11#include "gba/io.h"
12#include "gba/renderers/tile-cache.h"
13#include "gba/rr/rr.h"
14#include "gba/serialize.h"
15
16#include "util/memory.h"
17
18mLOG_DEFINE_CATEGORY(GBA_VIDEO, "GBA Video");
19
20static void GBAVideoDummyRendererInit(struct GBAVideoRenderer* renderer);
21static void GBAVideoDummyRendererReset(struct GBAVideoRenderer* renderer);
22static void GBAVideoDummyRendererDeinit(struct GBAVideoRenderer* renderer);
23static uint16_t GBAVideoDummyRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
24static void GBAVideoDummyRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address);
25static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
26static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam);
27static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y);
28static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer);
29static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels);
30static void GBAVideoDummyRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels);
31
32const int GBAVideoObjSizes[16][2] = {
33 { 8, 8 },
34 { 16, 16 },
35 { 32, 32 },
36 { 64, 64 },
37 { 16, 8 },
38 { 32, 8 },
39 { 32, 16 },
40 { 64, 32 },
41 { 8, 16 },
42 { 8, 32 },
43 { 16, 32 },
44 { 32, 64 },
45 { 0, 0 },
46 { 0, 0 },
47 { 0, 0 },
48 { 0, 0 },
49};
50
51static struct GBAVideoRenderer dummyRenderer = {
52 .init = GBAVideoDummyRendererInit,
53 .reset = GBAVideoDummyRendererReset,
54 .deinit = GBAVideoDummyRendererDeinit,
55 .writeVideoRegister = GBAVideoDummyRendererWriteVideoRegister,
56 .writeVRAM = GBAVideoDummyRendererWriteVRAM,
57 .writePalette = GBAVideoDummyRendererWritePalette,
58 .writeOAM = GBAVideoDummyRendererWriteOAM,
59 .drawScanline = GBAVideoDummyRendererDrawScanline,
60 .finishFrame = GBAVideoDummyRendererFinishFrame,
61 .getPixels = GBAVideoDummyRendererGetPixels,
62 .putPixels = GBAVideoDummyRendererPutPixels,
63};
64
65void GBAVideoInit(struct GBAVideo* video) {
66 video->renderer = &dummyRenderer;
67 video->renderer->cache = NULL;
68 video->vram = 0;
69 video->frameskip = 0;
70}
71
72void GBAVideoReset(struct GBAVideo* video) {
73 if (video->p->memory.fullBios) {
74 video->vcount = 0;
75 } else {
76 // TODO: Verify exact scanline hardware
77 video->vcount = 0x7E;
78 }
79 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
80
81 video->nextHblank = VIDEO_HDRAW_LENGTH;
82 video->nextEvent = video->nextHblank;
83 video->eventDiff = 0;
84
85 video->frameCounter = 0;
86 video->frameskipCounter = 0;
87
88 if (video->vram) {
89 mappedMemoryFree(video->vram, SIZE_VRAM);
90 }
91 video->vram = anonymousMemoryMap(SIZE_VRAM);
92 video->renderer->vram = video->vram;
93
94 memset(video->palette, 0, sizeof(video->palette));
95 memset(video->oam.raw, 0, sizeof(video->oam.raw));
96
97 video->renderer->deinit(video->renderer);
98 video->renderer->init(video->renderer);
99}
100
101void GBAVideoDeinit(struct GBAVideo* video) {
102 GBAVideoAssociateRenderer(video, &dummyRenderer);
103 mappedMemoryFree(video->vram, SIZE_VRAM);
104}
105
106void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer) {
107 video->renderer->deinit(video->renderer);
108 renderer->cache = video->renderer->cache;
109 video->renderer = renderer;
110 renderer->palette = video->palette;
111 renderer->vram = video->vram;
112 renderer->oam = &video->oam;
113 video->renderer->init(video->renderer);
114}
115
116int32_t GBAVideoProcessEvents(struct GBAVideo* video, int32_t cycles) {
117 video->nextEvent -= cycles;
118 video->eventDiff += cycles;
119 if (video->nextEvent <= 0) {
120 int32_t lastEvent = video->nextEvent;
121 video->nextHblank -= video->eventDiff;
122 video->eventDiff = 0;
123 uint16_t dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
124
125 if (GBARegisterDISPSTATIsInHblank(dispstat)) {
126 // End Hblank
127 dispstat = GBARegisterDISPSTATClearInHblank(dispstat);
128 video->nextEvent = video->nextHblank;
129
130 ++video->vcount;
131 if (video->vcount == VIDEO_VERTICAL_TOTAL_PIXELS) {
132 video->vcount = 0;
133 }
134 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
135
136 if (video->vcount == GBARegisterDISPSTATGetVcountSetting(dispstat)) {
137 dispstat = GBARegisterDISPSTATFillVcounter(dispstat);
138 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
139 GBARaiseIRQ(video->p, IRQ_VCOUNTER);
140 }
141 } else {
142 dispstat = GBARegisterDISPSTATClearVcounter(dispstat);
143 }
144 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
145
146 // Note: state may be recorded during callbacks, so ensure it is consistent!
147 switch (video->vcount) {
148 case 0:
149 GBAFrameStarted(video->p);
150 break;
151 case VIDEO_VERTICAL_PIXELS:
152 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATFillInVblank(dispstat);
153 if (video->frameskipCounter <= 0) {
154 video->renderer->finishFrame(video->renderer);
155 }
156 GBAMemoryRunVblankDMAs(video->p, lastEvent);
157 if (GBARegisterDISPSTATIsVblankIRQ(dispstat)) {
158 GBARaiseIRQ(video->p, IRQ_VBLANK);
159 }
160 GBAFrameEnded(video->p);
161 --video->frameskipCounter;
162 if (video->frameskipCounter < 0) {
163 mCoreSyncPostFrame(video->p->sync);
164 video->frameskipCounter = video->frameskip;
165 }
166 ++video->frameCounter;
167 break;
168 case VIDEO_VERTICAL_TOTAL_PIXELS - 1:
169 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATClearInVblank(dispstat);
170 break;
171 }
172 } else {
173 // Begin Hblank
174 dispstat = GBARegisterDISPSTATFillInHblank(dispstat);
175 video->nextEvent = video->nextHblank + VIDEO_HBLANK_LENGTH;
176 video->nextHblank = video->nextEvent + VIDEO_HDRAW_LENGTH;
177
178 if (video->vcount < VIDEO_VERTICAL_PIXELS && video->frameskipCounter <= 0) {
179 video->renderer->drawScanline(video->renderer, video->vcount);
180 }
181
182 if (video->vcount < VIDEO_VERTICAL_PIXELS) {
183 GBAMemoryRunHblankDMAs(video->p, lastEvent);
184 }
185 if (GBARegisterDISPSTATIsHblankIRQ(dispstat)) {
186 GBARaiseIRQ(video->p, IRQ_HBLANK);
187 }
188 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
189 }
190 }
191 return video->nextEvent;
192}
193
194void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value) {
195 video->p->memory.io[REG_DISPSTAT >> 1] &= 0x7;
196 video->p->memory.io[REG_DISPSTAT >> 1] |= value;
197 // TODO: Does a VCounter IRQ trigger on write?
198}
199
200static void GBAVideoDummyRendererInit(struct GBAVideoRenderer* renderer) {
201 UNUSED(renderer);
202 // Nothing to do
203}
204
205static void GBAVideoDummyRendererReset(struct GBAVideoRenderer* renderer) {
206 UNUSED(renderer);
207 // Nothing to do
208}
209
210static void GBAVideoDummyRendererDeinit(struct GBAVideoRenderer* renderer) {
211 UNUSED(renderer);
212 // Nothing to do
213}
214
215static uint16_t GBAVideoDummyRendererWriteVideoRegister(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
216 UNUSED(renderer);
217 switch (address) {
218 case REG_BG0CNT:
219 case REG_BG1CNT:
220 value &= 0xDFFF;
221 break;
222 case REG_BG2CNT:
223 case REG_BG3CNT:
224 value &= 0xFFFF;
225 break;
226 case REG_BG0HOFS:
227 case REG_BG0VOFS:
228 case REG_BG1HOFS:
229 case REG_BG1VOFS:
230 case REG_BG2HOFS:
231 case REG_BG2VOFS:
232 case REG_BG3HOFS:
233 case REG_BG3VOFS:
234 value &= 0x01FF;
235 break;
236 case REG_BLDCNT:
237 value &= 0x3FFF;
238 break;
239 case REG_BLDALPHA:
240 value &= 0x1F1F;
241 break;
242 case REG_WININ:
243 case REG_WINOUT:
244 value &= 0x3F3F;
245 break;
246 default:
247 break;
248 }
249 return value;
250}
251
252static void GBAVideoDummyRendererWriteVRAM(struct GBAVideoRenderer* renderer, uint32_t address) {
253 if (renderer->cache) {
254 mTileCacheWriteVRAM(renderer->cache, address);
255 }
256}
257
258static void GBAVideoDummyRendererWritePalette(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value) {
259 UNUSED(value);
260 if (renderer->cache) {
261 mTileCacheWritePalette(renderer->cache, address);
262 }
263}
264
265static void GBAVideoDummyRendererWriteOAM(struct GBAVideoRenderer* renderer, uint32_t oam) {
266 UNUSED(renderer);
267 UNUSED(oam);
268 // Nothing to do
269}
270
271static void GBAVideoDummyRendererDrawScanline(struct GBAVideoRenderer* renderer, int y) {
272 UNUSED(renderer);
273 UNUSED(y);
274 // Nothing to do
275}
276
277static void GBAVideoDummyRendererFinishFrame(struct GBAVideoRenderer* renderer) {
278 UNUSED(renderer);
279 // Nothing to do
280}
281
282static void GBAVideoDummyRendererGetPixels(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels) {
283 UNUSED(renderer);
284 UNUSED(stride);
285 UNUSED(pixels);
286 // Nothing to do
287}
288
289static void GBAVideoDummyRendererPutPixels(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels) {
290 UNUSED(renderer);
291 UNUSED(stride);
292 UNUSED(pixels);
293 // Nothing to do
294}
295
296void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state) {
297 memcpy(state->vram, video->renderer->vram, SIZE_VRAM);
298 memcpy(state->oam, video->oam.raw, SIZE_OAM);
299 memcpy(state->pram, video->palette, SIZE_PALETTE_RAM);
300 STORE_32(video->nextEvent, 0, &state->video.nextEvent);
301 STORE_32(video->eventDiff, 0, &state->video.eventDiff);
302 STORE_32(video->nextHblank, 0, &state->video.nextHblank);
303 STORE_32(video->frameCounter, 0, &state->video.frameCounter);
304}
305
306void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state) {
307 memcpy(video->renderer->vram, state->vram, SIZE_VRAM);
308 uint16_t value;
309 int i;
310 for (i = 0; i < SIZE_OAM; i += 2) {
311 LOAD_16(value, i, state->oam);
312 GBAStore16(video->p->cpu, BASE_OAM | i, value, 0);
313 }
314 for (i = 0; i < SIZE_PALETTE_RAM; i += 2) {
315 LOAD_16(value, i, state->pram);
316 GBAStore16(video->p->cpu, BASE_PALETTE_RAM | i, value, 0);
317 }
318 LOAD_32(video->nextEvent, 0, &state->video.nextEvent);
319 LOAD_32(video->eventDiff, 0, &state->video.eventDiff);
320 LOAD_32(video->nextHblank, 0, &state->video.nextHblank);
321 LOAD_32(video->frameCounter, 0, &state->video.frameCounter);
322 LOAD_16(video->vcount, REG_VCOUNT, state->io);
323 video->renderer->reset(video->renderer);
324}