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
32static void _startHblank(struct mTiming*, void* context, uint32_t cyclesLate);
33static void _startHdraw(struct mTiming*, void* context, uint32_t cyclesLate);
34
35const int GBAVideoObjSizes[16][2] = {
36 { 8, 8 },
37 { 16, 16 },
38 { 32, 32 },
39 { 64, 64 },
40 { 16, 8 },
41 { 32, 8 },
42 { 32, 16 },
43 { 64, 32 },
44 { 8, 16 },
45 { 8, 32 },
46 { 16, 32 },
47 { 32, 64 },
48 { 0, 0 },
49 { 0, 0 },
50 { 0, 0 },
51 { 0, 0 },
52};
53
54static struct GBAVideoRenderer dummyRenderer = {
55 .init = GBAVideoDummyRendererInit,
56 .reset = GBAVideoDummyRendererReset,
57 .deinit = GBAVideoDummyRendererDeinit,
58 .writeVideoRegister = GBAVideoDummyRendererWriteVideoRegister,
59 .writeVRAM = GBAVideoDummyRendererWriteVRAM,
60 .writePalette = GBAVideoDummyRendererWritePalette,
61 .writeOAM = GBAVideoDummyRendererWriteOAM,
62 .drawScanline = GBAVideoDummyRendererDrawScanline,
63 .finishFrame = GBAVideoDummyRendererFinishFrame,
64 .getPixels = GBAVideoDummyRendererGetPixels,
65 .putPixels = GBAVideoDummyRendererPutPixels,
66};
67
68void GBAVideoInit(struct GBAVideo* video) {
69 video->renderer = &dummyRenderer;
70 video->renderer->cache = NULL;
71 video->vram = 0;
72 video->frameskip = 0;
73 video->event.name = "GBA Video";
74 video->event.callback = NULL;
75 video->event.context = video;
76}
77
78void GBAVideoReset(struct GBAVideo* video) {
79 if (video->p->memory.fullBios) {
80 video->vcount = 0;
81 } else {
82 // TODO: Verify exact scanline hardware
83 video->vcount = 0x7E;
84 }
85 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
86
87 video->event.callback = _startHblank;
88 mTimingSchedule(&video->p->timing, &video->event, VIDEO_HDRAW_LENGTH);
89
90 video->frameCounter = 0;
91 video->frameskipCounter = 0;
92
93 if (video->vram) {
94 mappedMemoryFree(video->vram, SIZE_VRAM);
95 }
96 video->vram = anonymousMemoryMap(SIZE_VRAM);
97 video->renderer->vram = video->vram;
98
99 memset(video->palette, 0, sizeof(video->palette));
100 memset(video->oam.raw, 0, sizeof(video->oam.raw));
101
102 video->renderer->deinit(video->renderer);
103 video->renderer->init(video->renderer);
104}
105
106void GBAVideoDeinit(struct GBAVideo* video) {
107 GBAVideoAssociateRenderer(video, &dummyRenderer);
108 mappedMemoryFree(video->vram, SIZE_VRAM);
109}
110
111void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer) {
112 video->renderer->deinit(video->renderer);
113 renderer->cache = video->renderer->cache;
114 video->renderer = renderer;
115 renderer->palette = video->palette;
116 renderer->vram = video->vram;
117 renderer->oam = &video->oam;
118 video->renderer->init(video->renderer);
119}
120
121void _startHdraw(struct mTiming* timing, void* context, uint32_t cyclesLate) {
122 struct GBAVideo* video = context;
123 GBARegisterDISPSTAT dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
124 dispstat = GBARegisterDISPSTATClearInHblank(dispstat);
125 video->event.callback = _startHblank;
126 mTimingSchedule(timing, &video->event, VIDEO_HDRAW_LENGTH - cyclesLate);
127
128 ++video->vcount;
129 if (video->vcount == VIDEO_VERTICAL_TOTAL_PIXELS) {
130 video->vcount = 0;
131 }
132 video->p->memory.io[REG_VCOUNT >> 1] = video->vcount;
133
134 if (video->vcount == GBARegisterDISPSTATGetVcountSetting(dispstat)) {
135 dispstat = GBARegisterDISPSTATFillVcounter(dispstat);
136 if (GBARegisterDISPSTATIsVcounterIRQ(dispstat)) {
137 GBARaiseIRQ(video->p, IRQ_VCOUNTER);
138 }
139 } else {
140 dispstat = GBARegisterDISPSTATClearVcounter(dispstat);
141 }
142 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
143
144 // Note: state may be recorded during callbacks, so ensure it is consistent!
145 switch (video->vcount) {
146 case 0:
147 GBAFrameStarted(video->p);
148 break;
149 case VIDEO_VERTICAL_PIXELS:
150 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATFillInVblank(dispstat);
151 if (video->frameskipCounter <= 0) {
152 video->renderer->finishFrame(video->renderer);
153 }
154 GBAMemoryRunVblankDMAs(video->p, -cyclesLate);
155 if (GBARegisterDISPSTATIsVblankIRQ(dispstat)) {
156 GBARaiseIRQ(video->p, IRQ_VBLANK);
157 }
158 GBAFrameEnded(video->p);
159 --video->frameskipCounter;
160 if (video->frameskipCounter < 0) {
161 mCoreSyncPostFrame(video->p->sync);
162 video->frameskipCounter = video->frameskip;
163 }
164 ++video->frameCounter;
165 break;
166 case VIDEO_VERTICAL_TOTAL_PIXELS - 1:
167 video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATClearInVblank(dispstat);
168 break;
169 }
170}
171
172void _startHblank(struct mTiming* timing, void* context, uint32_t cyclesLate) {
173 struct GBAVideo* video = context;
174 GBARegisterDISPSTAT dispstat = video->p->memory.io[REG_DISPSTAT >> 1];
175 dispstat = GBARegisterDISPSTATFillInHblank(dispstat);
176 video->event.callback = _startHdraw;
177 mTimingSchedule(timing, &video->event, VIDEO_HBLANK_LENGTH - cyclesLate);
178
179 // Begin Hblank
180 dispstat = GBARegisterDISPSTATFillInHblank(dispstat);
181 if (video->vcount < VIDEO_VERTICAL_PIXELS && video->frameskipCounter <= 0) {
182 video->renderer->drawScanline(video->renderer, video->vcount);
183 }
184
185 if (video->vcount < VIDEO_VERTICAL_PIXELS) {
186 GBAMemoryRunHblankDMAs(video->p, -cyclesLate);
187 }
188 if (GBARegisterDISPSTATIsHblankIRQ(dispstat)) {
189 GBARaiseIRQ(video->p, IRQ_HBLANK);
190 }
191 video->p->memory.io[REG_DISPSTAT >> 1] = dispstat;
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->frameCounter, 0, &state->video.frameCounter);
301}
302
303void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state) {
304 memcpy(video->renderer->vram, state->vram, SIZE_VRAM);
305 uint16_t value;
306 int i;
307 for (i = 0; i < SIZE_OAM; i += 2) {
308 LOAD_16(value, i, state->oam);
309 GBAStore16(video->p->cpu, BASE_OAM | i, value, 0);
310 }
311 for (i = 0; i < SIZE_PALETTE_RAM; i += 2) {
312 LOAD_16(value, i, state->pram);
313 GBAStore16(video->p->cpu, BASE_PALETTE_RAM | i, value, 0);
314 }
315 LOAD_32(video->frameCounter, 0, &state->video.frameCounter);
316 LOAD_16(video->vcount, REG_VCOUNT, state->io);
317 video->renderer->reset(video->renderer);
318}