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#ifndef GBA_VIDEO_H
  7#define GBA_VIDEO_H
  8
  9#include <mgba-util/common.h>
 10
 11CXX_GUARD_START
 12
 13#include <mgba/core/log.h>
 14#include <mgba/core/timing.h>
 15#include <mgba/gba/interface.h>
 16
 17mLOG_DECLARE_CATEGORY(GBA_VIDEO);
 18
 19enum {
 20	VIDEO_HBLANK_PIXELS = 68,
 21	VIDEO_HDRAW_LENGTH = 960,
 22	VIDEO_HBLANK_LENGTH = 272,
 23	VIDEO_HBLANK_FLIP = 46,
 24	VIDEO_HORIZONTAL_LENGTH = 1232,
 25
 26	VIDEO_VBLANK_PIXELS = 68,
 27	VIDEO_VERTICAL_TOTAL_PIXELS = 228,
 28
 29	VIDEO_TOTAL_LENGTH = 280896,
 30
 31	OBJ_HBLANK_FREE_LENGTH = 954,
 32	OBJ_LENGTH = 1210,
 33
 34	BASE_TILE = 0x00010000
 35};
 36
 37enum GBAVideoObjMode {
 38	OBJ_MODE_NORMAL = 0,
 39	OBJ_MODE_SEMITRANSPARENT = 1,
 40	OBJ_MODE_OBJWIN = 2
 41};
 42
 43enum GBAVideoObjShape {
 44	OBJ_SHAPE_SQUARE = 0,
 45	OBJ_SHAPE_HORIZONTAL = 1,
 46	OBJ_SHAPE_VERTICAL = 2
 47};
 48
 49enum GBAVideoBlendEffect {
 50	BLEND_NONE = 0,
 51	BLEND_ALPHA = 1,
 52	BLEND_BRIGHTEN = 2,
 53	BLEND_DARKEN = 3
 54};
 55
 56DECL_BITFIELD(GBAObjAttributesA, uint16_t);
 57DECL_BITS(GBAObjAttributesA, Y, 0, 8);
 58DECL_BIT(GBAObjAttributesA, Transformed, 8);
 59DECL_BIT(GBAObjAttributesA, Disable, 9);
 60DECL_BIT(GBAObjAttributesA, DoubleSize, 9);
 61DECL_BITS(GBAObjAttributesA, Mode, 10, 2);
 62DECL_BIT(GBAObjAttributesA, Mosaic, 12);
 63DECL_BIT(GBAObjAttributesA, 256Color, 13);
 64DECL_BITS(GBAObjAttributesA, Shape, 14, 2);
 65
 66DECL_BITFIELD(GBAObjAttributesB, uint16_t);
 67DECL_BITS(GBAObjAttributesB, X, 0, 9);
 68DECL_BITS(GBAObjAttributesB, MatIndex, 9, 5);
 69DECL_BIT(GBAObjAttributesB, HFlip, 12);
 70DECL_BIT(GBAObjAttributesB, VFlip, 13);
 71DECL_BITS(GBAObjAttributesB, Size, 14, 2);
 72
 73DECL_BITFIELD(GBAObjAttributesC, uint16_t);
 74DECL_BITS(GBAObjAttributesC, Tile, 0, 10);
 75DECL_BITS(GBAObjAttributesC, Priority, 10, 2);
 76DECL_BITS(GBAObjAttributesC, Palette, 12, 4);
 77
 78struct GBAObj {
 79	GBAObjAttributesA a;
 80	GBAObjAttributesB b;
 81	GBAObjAttributesC c;
 82	uint16_t d;
 83};
 84
 85struct GBAOAMMatrix {
 86	int16_t padding0[3];
 87	int16_t a;
 88	int16_t padding1[3];
 89	int16_t b;
 90	int16_t padding2[3];
 91	int16_t c;
 92	int16_t padding3[3];
 93	int16_t d;
 94};
 95
 96union GBAOAM {
 97	struct GBAObj obj[128];
 98	struct GBAOAMMatrix mat[32];
 99	uint16_t raw[512];
100};
101
102struct GBAVideoWindowRegion {
103	uint8_t end;
104	uint8_t start;
105};
106
107#define GBA_TEXT_MAP_TILE(MAP) ((MAP) & 0x03FF)
108#define GBA_TEXT_MAP_HFLIP(MAP) ((MAP) & 0x0400)
109#define GBA_TEXT_MAP_VFLIP(MAP) ((MAP) & 0x0800)
110#define GBA_TEXT_MAP_PALETTE(MAP) (((MAP) & 0xF000) >> 12)
111
112DECL_BITFIELD(GBARegisterDISPCNT, uint16_t);
113DECL_BITS(GBARegisterDISPCNT, Mode, 0, 3);
114DECL_BIT(GBARegisterDISPCNT, Cgb, 3);
115DECL_BIT(GBARegisterDISPCNT, FrameSelect, 4);
116DECL_BIT(GBARegisterDISPCNT, HblankIntervalFree, 5);
117DECL_BIT(GBARegisterDISPCNT, ObjCharacterMapping, 6);
118DECL_BIT(GBARegisterDISPCNT, ForcedBlank, 7);
119DECL_BIT(GBARegisterDISPCNT, Bg0Enable, 8);
120DECL_BIT(GBARegisterDISPCNT, Bg1Enable, 9);
121DECL_BIT(GBARegisterDISPCNT, Bg2Enable, 10);
122DECL_BIT(GBARegisterDISPCNT, Bg3Enable, 11);
123DECL_BIT(GBARegisterDISPCNT, ObjEnable, 12);
124DECL_BIT(GBARegisterDISPCNT, Win0Enable, 13);
125DECL_BIT(GBARegisterDISPCNT, Win1Enable, 14);
126DECL_BIT(GBARegisterDISPCNT, ObjwinEnable, 15);
127
128DECL_BITFIELD(GBARegisterDISPSTAT, uint16_t);
129DECL_BIT(GBARegisterDISPSTAT, InVblank, 0);
130DECL_BIT(GBARegisterDISPSTAT, InHblank, 1);
131DECL_BIT(GBARegisterDISPSTAT, Vcounter, 2);
132DECL_BIT(GBARegisterDISPSTAT, VblankIRQ, 3);
133DECL_BIT(GBARegisterDISPSTAT, HblankIRQ, 4);
134DECL_BIT(GBARegisterDISPSTAT, VcounterIRQ, 5);
135DECL_BITS(GBARegisterDISPSTAT, VcountSetting, 8, 8);
136
137DECL_BITFIELD(GBARegisterBGCNT, uint16_t);
138DECL_BITS(GBARegisterBGCNT, Priority, 0, 2);
139DECL_BITS(GBARegisterBGCNT, CharBase, 2, 2);
140DECL_BIT(GBARegisterBGCNT, Mosaic, 6);
141DECL_BIT(GBARegisterBGCNT, 256Color, 7);
142DECL_BITS(GBARegisterBGCNT, ScreenBase, 8, 5);
143DECL_BIT(GBARegisterBGCNT, Overflow, 13);
144DECL_BITS(GBARegisterBGCNT, Size, 14, 2);
145
146DECL_BITFIELD(GBARegisterBLDCNT, uint16_t);
147DECL_BIT(GBARegisterBLDCNT, Target1Bg0, 0);
148DECL_BIT(GBARegisterBLDCNT, Target1Bg1, 1);
149DECL_BIT(GBARegisterBLDCNT, Target1Bg2, 2);
150DECL_BIT(GBARegisterBLDCNT, Target1Bg3, 3);
151DECL_BIT(GBARegisterBLDCNT, Target1Obj, 4);
152DECL_BIT(GBARegisterBLDCNT, Target1Bd, 5);
153DECL_BITS(GBARegisterBLDCNT, Effect, 6, 2);
154DECL_BIT(GBARegisterBLDCNT, Target2Bg0, 8);
155DECL_BIT(GBARegisterBLDCNT, Target2Bg1, 9);
156DECL_BIT(GBARegisterBLDCNT, Target2Bg2, 10);
157DECL_BIT(GBARegisterBLDCNT, Target2Bg3, 11);
158DECL_BIT(GBARegisterBLDCNT, Target2Obj, 12);
159DECL_BIT(GBARegisterBLDCNT, Target2Bd, 13);
160
161DECL_BITFIELD(GBAWindowControl, uint8_t);
162DECL_BIT(GBAWindowControl, Bg0Enable, 0);
163DECL_BIT(GBAWindowControl, Bg1Enable, 1);
164DECL_BIT(GBAWindowControl, Bg2Enable, 2);
165DECL_BIT(GBAWindowControl, Bg3Enable, 3);
166DECL_BIT(GBAWindowControl, ObjEnable, 4);
167DECL_BIT(GBAWindowControl, BlendEnable, 5);
168
169DECL_BITFIELD(GBAMosaicControl, uint16_t);
170DECL_BITS(GBAMosaicControl, BgH, 0, 4);
171DECL_BITS(GBAMosaicControl, BgV, 4, 4);
172DECL_BITS(GBAMosaicControl, ObjH, 8, 4);
173DECL_BITS(GBAMosaicControl, ObjV, 12, 4);
174
175struct GBAVideoRenderer {
176	void (*init)(struct GBAVideoRenderer* renderer);
177	void (*reset)(struct GBAVideoRenderer* renderer);
178	void (*deinit)(struct GBAVideoRenderer* renderer);
179
180	uint16_t (*writeVideoRegister)(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
181	void (*writeVRAM)(struct GBAVideoRenderer* renderer, uint32_t address);
182	void (*writePalette)(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
183	void (*writeOAM)(struct GBAVideoRenderer* renderer, uint32_t oam);
184	void (*drawScanline)(struct GBAVideoRenderer* renderer, int y);
185	void (*finishFrame)(struct GBAVideoRenderer* renderer);
186
187	void (*getPixels)(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels);
188	void (*putPixels)(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels);
189
190	uint16_t* palette;
191	uint16_t* vram;
192	union GBAOAM* oam;
193	struct mCacheSet* cache;
194
195	bool disableBG[4];
196	bool disableOBJ;
197
198	bool highlightBG[4];
199	bool highlightOBJ[128];
200	color_t highlightColor;
201	uint8_t highlightAmount;
202};
203
204struct GBAVideo {
205	struct GBA* p;
206	struct GBAVideoRenderer* renderer;
207	struct mTimingEvent event;
208
209	int vcount;
210	int shouldStall;
211
212	uint16_t palette[512];
213	uint16_t* vram;
214	union GBAOAM oam;
215
216	int32_t frameCounter;
217	int frameskip;
218	int frameskipCounter;
219};
220
221void GBAVideoInit(struct GBAVideo* video);
222void GBAVideoReset(struct GBAVideo* video);
223void GBAVideoDeinit(struct GBAVideo* video);
224void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer);
225
226void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value);
227
228struct GBASerializedState;
229void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state);
230void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state);
231
232extern MGBA_EXPORT const int GBAVideoObjSizes[16][2];
233
234CXX_GUARD_END
235
236#endif