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
 16mLOG_DECLARE_CATEGORY(GBA_VIDEO);
 17
 18enum {
 19	VIDEO_HORIZONTAL_PIXELS = 240,
 20	VIDEO_HBLANK_PIXELS = 68,
 21	VIDEO_HDRAW_LENGTH = 1006,
 22	VIDEO_HBLANK_LENGTH = 226,
 23	VIDEO_HORIZONTAL_LENGTH = 1232,
 24
 25	VIDEO_VERTICAL_PIXELS = 160,
 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 ObjMode {
 38	OBJ_MODE_NORMAL = 0,
 39	OBJ_MODE_SEMITRANSPARENT = 1,
 40	OBJ_MODE_OBJWIN = 2
 41};
 42
 43enum ObjShape {
 44	OBJ_SHAPE_SQUARE = 0,
 45	OBJ_SHAPE_HORIZONTAL = 1,
 46	OBJ_SHAPE_VERTICAL = 2
 47};
 48
 49DECL_BITFIELD(GBAObjAttributesA, uint16_t);
 50DECL_BITS(GBAObjAttributesA, Y, 0, 8);
 51DECL_BIT(GBAObjAttributesA, Transformed, 8);
 52DECL_BIT(GBAObjAttributesA, Disable, 9);
 53DECL_BIT(GBAObjAttributesA, DoubleSize, 9);
 54DECL_BITS(GBAObjAttributesA, Mode, 10, 2);
 55DECL_BIT(GBAObjAttributesA, Mosaic, 12);
 56DECL_BIT(GBAObjAttributesA, 256Color, 13);
 57DECL_BITS(GBAObjAttributesA, Shape, 14, 2);
 58
 59DECL_BITFIELD(GBAObjAttributesB, uint16_t);
 60DECL_BITS(GBAObjAttributesB, X, 0, 9);
 61DECL_BITS(GBAObjAttributesB, MatIndex, 9, 5);
 62DECL_BIT(GBAObjAttributesB, HFlip, 12);
 63DECL_BIT(GBAObjAttributesB, VFlip, 13);
 64DECL_BITS(GBAObjAttributesB, Size, 14, 2);
 65
 66DECL_BITFIELD(GBAObjAttributesC, uint16_t);
 67DECL_BITS(GBAObjAttributesC, Tile, 0, 10);
 68DECL_BITS(GBAObjAttributesC, Priority, 10, 2);
 69DECL_BITS(GBAObjAttributesC, Palette, 12, 4);
 70
 71struct GBAObj {
 72	GBAObjAttributesA a;
 73	GBAObjAttributesB b;
 74	GBAObjAttributesC c;
 75	uint16_t d;
 76};
 77
 78union GBAOAM {
 79	struct GBAObj obj[128];
 80
 81	struct GBAOAMMatrix {
 82		int16_t padding0[3];
 83		int16_t a;
 84		int16_t padding1[3];
 85		int16_t b;
 86		int16_t padding2[3];
 87		int16_t c;
 88		int16_t padding3[3];
 89		int16_t d;
 90	} mat[32];
 91
 92	uint16_t raw[512];
 93};
 94
 95#define GBA_TEXT_MAP_TILE(MAP) ((MAP) & 0x03FF)
 96#define GBA_TEXT_MAP_HFLIP(MAP) ((MAP) & 0x0400)
 97#define GBA_TEXT_MAP_VFLIP(MAP) ((MAP) & 0x0800)
 98#define GBA_TEXT_MAP_PALETTE(MAP) (((MAP) & 0xF000) >> 12)
 99
100DECL_BITFIELD(GBARegisterDISPCNT, uint16_t);
101DECL_BITS(GBARegisterDISPCNT, Mode, 0, 3);
102DECL_BIT(GBARegisterDISPCNT, Cgb, 3);
103DECL_BIT(GBARegisterDISPCNT, FrameSelect, 4);
104DECL_BIT(GBARegisterDISPCNT, HblankIntervalFree, 5);
105DECL_BIT(GBARegisterDISPCNT, ObjCharacterMapping, 6);
106DECL_BIT(GBARegisterDISPCNT, ForcedBlank, 7);
107DECL_BIT(GBARegisterDISPCNT, Bg0Enable, 8);
108DECL_BIT(GBARegisterDISPCNT, Bg1Enable, 9);
109DECL_BIT(GBARegisterDISPCNT, Bg2Enable, 10);
110DECL_BIT(GBARegisterDISPCNT, Bg3Enable, 11);
111DECL_BIT(GBARegisterDISPCNT, ObjEnable, 12);
112DECL_BIT(GBARegisterDISPCNT, Win0Enable, 13);
113DECL_BIT(GBARegisterDISPCNT, Win1Enable, 14);
114DECL_BIT(GBARegisterDISPCNT, ObjwinEnable, 15);
115
116DECL_BITFIELD(GBARegisterDISPSTAT, uint16_t);
117DECL_BIT(GBARegisterDISPSTAT, InVblank, 0);
118DECL_BIT(GBARegisterDISPSTAT, InHblank, 1);
119DECL_BIT(GBARegisterDISPSTAT, Vcounter, 2);
120DECL_BIT(GBARegisterDISPSTAT, VblankIRQ, 3);
121DECL_BIT(GBARegisterDISPSTAT, HblankIRQ, 4);
122DECL_BIT(GBARegisterDISPSTAT, VcounterIRQ, 5);
123DECL_BITS(GBARegisterDISPSTAT, VcountSetting, 8, 8);
124
125DECL_BITFIELD(GBARegisterBGCNT, uint16_t);
126DECL_BITS(GBARegisterBGCNT, Priority, 0, 2);
127DECL_BITS(GBARegisterBGCNT, CharBase, 2, 2);
128DECL_BIT(GBARegisterBGCNT, Mosaic, 6);
129DECL_BIT(GBARegisterBGCNT, 256Color, 7);
130DECL_BITS(GBARegisterBGCNT, ScreenBase, 8, 5);
131DECL_BIT(GBARegisterBGCNT, Overflow, 13);
132DECL_BITS(GBARegisterBGCNT, Size, 14, 2);
133
134DECL_BITFIELD(GBARegisterBLDCNT, uint16_t);
135DECL_BIT(GBARegisterBLDCNT, Target1Bg0, 0);
136DECL_BIT(GBARegisterBLDCNT, Target1Bg1, 1);
137DECL_BIT(GBARegisterBLDCNT, Target1Bg2, 2);
138DECL_BIT(GBARegisterBLDCNT, Target1Bg3, 3);
139DECL_BIT(GBARegisterBLDCNT, Target1Obj, 4);
140DECL_BIT(GBARegisterBLDCNT, Target1Bd, 5);
141DECL_BITS(GBARegisterBLDCNT, Effect, 6, 2);
142DECL_BIT(GBARegisterBLDCNT, Target2Bg0, 8);
143DECL_BIT(GBARegisterBLDCNT, Target2Bg1, 9);
144DECL_BIT(GBARegisterBLDCNT, Target2Bg2, 10);
145DECL_BIT(GBARegisterBLDCNT, Target2Bg3, 11);
146DECL_BIT(GBARegisterBLDCNT, Target2Obj, 12);
147DECL_BIT(GBARegisterBLDCNT, Target2Bd, 13);
148
149struct GBAVideoRenderer {
150	void (*init)(struct GBAVideoRenderer* renderer);
151	void (*reset)(struct GBAVideoRenderer* renderer);
152	void (*deinit)(struct GBAVideoRenderer* renderer);
153
154	uint16_t (*writeVideoRegister)(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
155	void (*writeVRAM)(struct GBAVideoRenderer* renderer, uint32_t address);
156	void (*writePalette)(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
157	void (*writeOAM)(struct GBAVideoRenderer* renderer, uint32_t oam);
158	void (*drawScanline)(struct GBAVideoRenderer* renderer, int y);
159	void (*finishFrame)(struct GBAVideoRenderer* renderer);
160
161	void (*getPixels)(struct GBAVideoRenderer* renderer, size_t* stride, const void** pixels);
162	void (*putPixels)(struct GBAVideoRenderer* renderer, size_t stride, const void* pixels);
163
164	uint16_t* palette;
165	uint16_t* vram;
166	union GBAOAM* oam;
167	struct mTileCache* cache;
168
169	bool disableBG[4];
170	bool disableOBJ;
171};
172
173struct GBAVideo {
174	struct GBA* p;
175	struct GBAVideoRenderer* renderer;
176	struct mTimingEvent event;
177
178	// VCOUNT
179	int vcount;
180
181	uint16_t palette[512];
182	uint16_t* vram;
183	union GBAOAM oam;
184
185	int32_t frameCounter;
186	int frameskip;
187	int frameskipCounter;
188};
189
190void GBAVideoInit(struct GBAVideo* video);
191void GBAVideoReset(struct GBAVideo* video);
192void GBAVideoDeinit(struct GBAVideo* video);
193void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer);
194
195void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value);
196
197struct GBASerializedState;
198void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state);
199void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state);
200
201extern const int GBAVideoObjSizes[16][2];
202
203CXX_GUARD_END
204
205#endif