src/gb/renderers/software.c (view raw)
1/* Copyright (c) 2013-2016 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 "software.h"
7
8#include "gb/io.h"
9#include "util/memory.h"
10
11static void GBVideoSoftwareRendererInit(struct GBVideoRenderer* renderer);
12static void GBVideoSoftwareRendererDeinit(struct GBVideoRenderer* renderer);
13static void GBVideoSoftwareRendererReset(struct GBVideoRenderer* renderer);
14static void GBVideoSoftwareRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address);
15static void GBVideoSoftwareRendererWriteOAM(struct GBVideoRenderer* renderer, uint8_t oam);
16static uint8_t GBVideoSoftwareRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value);
17static void GBVideoSoftwareRendererDrawScanline(struct GBVideoRenderer* renderer, int y);
18static void GBVideoSoftwareRendererFinishFrame(struct GBVideoRenderer* renderer);
19static void GBVideoSoftwareRendererGetPixels(struct GBVideoRenderer* renderer, unsigned* stride, const void** pixels);
20static void GBVideoSoftwareRendererPutPixels(struct GBVideoRenderer* renderer, unsigned stride, void* pixels);
21
22static void GBVideoSoftwareRendererDrawBackground(struct GBVideoSoftwareRenderer* renderer, uint8_t* maps, int x, int y, int sx, int sy);
23static void GBVideoSoftwareRendererDrawObj(struct GBVideoSoftwareRenderer* renderer, struct GBObj* obj, int y);
24
25static void _cleanOAM(struct GBVideoSoftwareRenderer* renderer);
26
27#ifdef COLOR_16_BIT
28#ifdef COLOR_5_6_5
29static const color_t GB_PALETTE[4] = { 0xFFFF, 0x39C7, 0x18C3, 0x0000};
30#else
31static const color_t GB_PALETTE[4] = { 0x7FFF, 0x1DE7, 0x0C63, 0x0000};
32#endif
33#else
34static const color_t GB_PALETTE[4] = { 0xFFFFFF, 0x808080, 0x404040, 0x000000};
35#endif
36
37void GBVideoSoftwareRendererCreate(struct GBVideoSoftwareRenderer* renderer) {
38 renderer->d.init = GBVideoSoftwareRendererInit;
39 renderer->d.reset = GBVideoSoftwareRendererReset;
40 renderer->d.deinit = GBVideoSoftwareRendererDeinit;
41 renderer->d.writeVideoRegister = GBVideoSoftwareRendererWriteVideoRegister;
42 renderer->d.writeVRAM = GBVideoSoftwareRendererWriteVRAM;
43 renderer->d.writeOAM = GBVideoSoftwareRendererWriteOAM;
44 renderer->d.drawScanline = GBVideoSoftwareRendererDrawScanline;
45 renderer->d.finishFrame = GBVideoSoftwareRendererFinishFrame;
46 renderer->d.getPixels = 0;
47 renderer->d.putPixels = 0;
48
49 renderer->temporaryBuffer = 0;
50}
51
52static void GBVideoSoftwareRendererInit(struct GBVideoRenderer* renderer) {
53 GBVideoSoftwareRendererReset(renderer);
54
55 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
56
57 int y;
58 for (y = 0; y < GB_VIDEO_VERTICAL_PIXELS; ++y) {
59 color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
60 int x;
61 for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
62 row[x] = GB_PALETTE[0];
63 }
64 }
65}
66
67static void GBVideoSoftwareRendererReset(struct GBVideoRenderer* renderer) {
68 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
69 softwareRenderer->scy = 0;
70 softwareRenderer->scx = 0;
71 softwareRenderer->wy = 0;
72 softwareRenderer->wx = 0;
73 softwareRenderer->oamMax = 0;
74 softwareRenderer->oamDirty = false;
75}
76
77static void GBVideoSoftwareRendererDeinit(struct GBVideoRenderer* renderer) {
78 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
79 UNUSED(softwareRenderer);
80}
81
82static void GBVideoSoftwareRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address) {
83 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
84 // TODO
85}
86
87static void GBVideoSoftwareRendererWriteOAM(struct GBVideoRenderer* renderer, uint8_t oam) {
88 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
89 UNUSED(oam);
90 softwareRenderer->oamDirty = true;
91}
92
93static uint8_t GBVideoSoftwareRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value) {
94 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
95 switch (address) {
96 case REG_LCDC:
97 softwareRenderer->lcdc = value;
98 break;
99 case REG_BGP:
100 softwareRenderer->bgPalette[0] = GB_PALETTE[value & 3];
101 softwareRenderer->bgPalette[1] = GB_PALETTE[(value >> 2) & 3];
102 softwareRenderer->bgPalette[2] = GB_PALETTE[(value >> 4) & 3];
103 softwareRenderer->bgPalette[3] = GB_PALETTE[(value >> 6) & 3];
104 break;
105 case REG_OBP0:
106 softwareRenderer->objPalette[0][0] = GB_PALETTE[value & 3];
107 softwareRenderer->objPalette[0][1] = GB_PALETTE[(value >> 2) & 3];
108 softwareRenderer->objPalette[0][2] = GB_PALETTE[(value >> 4) & 3];
109 softwareRenderer->objPalette[0][3] = GB_PALETTE[(value >> 6) & 3];
110 break;
111 case REG_OBP1:
112 softwareRenderer->objPalette[1][0] = GB_PALETTE[value & 3];
113 softwareRenderer->objPalette[1][1] = GB_PALETTE[(value >> 2) & 3];
114 softwareRenderer->objPalette[1][2] = GB_PALETTE[(value >> 4) & 3];
115 softwareRenderer->objPalette[1][3] = GB_PALETTE[(value >> 6) & 3];
116 break;
117 case REG_SCY:
118 softwareRenderer->scy = value;
119 break;
120 case REG_SCX:
121 softwareRenderer->scx = value;
122 break;
123 case REG_WY:
124 softwareRenderer->wy = value;
125 break;
126 case REG_WX:
127 softwareRenderer->wx = value;
128 break;
129 }
130 return value;
131}
132
133static void GBVideoSoftwareRendererDrawScanline(struct GBVideoRenderer* renderer, int y) {
134 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
135
136 size_t x;
137 for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
138 softwareRenderer->row[x] = GB_PALETTE[0];
139 }
140
141 if (softwareRenderer->oamDirty) {
142 _cleanOAM(softwareRenderer);
143 }
144
145 uint8_t* maps = &softwareRenderer->d.vram[GB_BASE_MAP];
146 if (GBRegisterLCDCIsTileMap(softwareRenderer->lcdc)) {
147 maps += GB_SIZE_MAP;
148 }
149 GBVideoSoftwareRendererDrawBackground(softwareRenderer, maps, 0, y, softwareRenderer->scx, softwareRenderer->scy);
150
151 if (GBRegisterLCDCIsWindow(softwareRenderer->lcdc) && softwareRenderer->wy < GB_VIDEO_VERTICAL_PIXELS) {
152 maps = &softwareRenderer->d.vram[GB_BASE_MAP];
153 if (GBRegisterLCDCIsWindowTileMap(softwareRenderer->lcdc)) {
154 maps += GB_SIZE_MAP;
155 }
156 GBVideoSoftwareRendererDrawBackground(softwareRenderer, maps, 0, y, 7 - softwareRenderer->wx, -softwareRenderer->wy);
157 }
158
159 int spriteHeight = 8;
160 if (GBRegisterLCDCIsObjSize(softwareRenderer->lcdc)) {
161 spriteHeight = 16;
162 }
163 int i;
164 for (i = 0; i < softwareRenderer->oamMax; ++i) {
165 // TODO: Sprite sizes
166 if (y >= softwareRenderer->obj[i]->y - 16 && y < softwareRenderer->obj[i]->y - 16 + spriteHeight) {
167 GBVideoSoftwareRendererDrawObj(softwareRenderer, softwareRenderer->obj[i], y);
168 }
169 }
170
171 color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
172#ifdef COLOR_16_BIT
173#if defined(__ARM_NEON) && !defined(__APPLE__)
174 _to16Bit(row, softwareRenderer->row, GB_VIDEO_HORIZONTAL_PIXELS);
175#else
176 for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
177 row[x] = softwareRenderer->row[x];
178 }
179#endif
180#else
181 memcpy(row, softwareRenderer->row, GB_VIDEO_HORIZONTAL_PIXELS * sizeof(*row));
182#endif
183}
184
185static void _cleanOAM(struct GBVideoSoftwareRenderer* renderer) {
186 // TODO: GBC differences
187 renderer->oamMax = 0;
188 int o = 0;
189 int i;
190 for (i = 0; i < 40; ++i) {
191 uint8_t y = renderer->d.oam->obj[i].y;
192 if (y < 16 || y >= GB_VIDEO_VERTICAL_PIXELS + 16) {
193 continue;
194 }
195 // TODO: Sort
196 renderer->obj[o] = &renderer->d.oam->obj[i];
197 ++o;
198 }
199 renderer->oamMax = o;
200 renderer->oamDirty = false;
201}
202
203static void GBVideoSoftwareRendererFinishFrame(struct GBVideoRenderer* renderer) {
204 struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
205
206 if (softwareRenderer->temporaryBuffer) {
207 mappedMemoryFree(softwareRenderer->temporaryBuffer, GB_VIDEO_HORIZONTAL_PIXELS * GB_VIDEO_VERTICAL_PIXELS * 4);
208 softwareRenderer->temporaryBuffer = 0;
209 }
210}
211
212static void GBVideoSoftwareRendererDrawBackground(struct GBVideoSoftwareRenderer* renderer, uint8_t* maps, int x, int y, int sx, int sy) {
213 uint8_t* data = renderer->d.vram;
214 if (!GBRegisterLCDCIsTileData(renderer->lcdc)) {
215 data += 0x1000;
216 }
217 int topY = (((y + sy) >> 3) & 0x1F) * 0x20;
218 int bottomY = (y + sy) & 7;
219 for (; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
220 int topX = ((x + sx) >> 3) & 0x1F;
221 int bottomX = 7 - ((x + sx) & 7);
222 int bgTile;
223 if (GBRegisterLCDCIsTileData(renderer->lcdc)) {
224 bgTile = maps[topX + topY];
225 } else {
226 bgTile = ((int8_t*) maps)[topX + topY];
227 }
228 uint8_t tileDataLower = data[(bgTile * 8 + bottomY) * 2];
229 uint8_t tileDataUpper = data[(bgTile * 8 + bottomY) * 2 + 1];
230 tileDataUpper >>= bottomX;
231 tileDataLower >>= bottomX;
232 renderer->row[x] = renderer->bgPalette[((tileDataUpper & 1) << 1) | (tileDataLower & 1)];
233 }
234}
235
236static void GBVideoSoftwareRendererDrawObj(struct GBVideoSoftwareRenderer* renderer, struct GBObj* obj, int y) {
237 uint8_t* data = renderer->d.vram;
238 int tileOffset = 0;
239 int bottomY;
240 if (GBObjAttributesIsYFlip(obj->attr)) {
241 bottomY = 7 - ((y - obj->y - 16) & 7);
242 if (y - obj->y < -8) {
243 ++tileOffset;
244 }
245 } else {
246 bottomY = (y - obj->y - 16) & 7;
247 if (y - obj->y >= -8) {
248 ++tileOffset;
249 }
250 }
251 int end = GB_VIDEO_HORIZONTAL_PIXELS;
252 if (obj->x < end) {
253 end = obj->x;
254 }
255 int x = obj->x - 8;
256 if (x < 0) {
257 x = 0;
258 }
259 for (; x < end; ++x) {
260 int bottomX;
261 if (GBObjAttributesIsXFlip(obj->attr)) {
262 bottomX = (x - obj->x) & 7;
263 } else {
264 bottomX = 7 - ((x - obj->x) & 7);
265 }
266 int objTile = obj->tile + tileOffset;
267 uint8_t tileDataLower = data[(objTile * 8 + bottomY) * 2];
268 uint8_t tileDataUpper = data[(objTile * 8 + bottomY) * 2 + 1];
269 tileDataUpper >>= bottomX;
270 tileDataLower >>= bottomX;
271 color_t current = renderer->row[x];
272 if (((tileDataUpper | tileDataLower) & 1) && (!GBObjAttributesIsPriority(obj->attr) || current == GB_PALETTE[0])) {
273 renderer->row[x] = renderer->bgPalette[((tileDataUpper & 1) << 1) | (tileDataLower & 1)];
274 }
275 }
276}