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 VIDEO_SOFTWARE_H
  7#define VIDEO_SOFTWARE_H
  8
  9#include <mgba-util/common.h>
 10
 11CXX_GUARD_START
 12
 13#include <mgba/core/core.h>
 14#include <mgba/gba/interface.h>
 15#include <mgba/internal/gba/io.h>
 16#include <mgba/internal/gba/video.h>
 17
 18struct GBAVideoSoftwareSprite {
 19	struct GBAObj obj;
 20	int y;
 21	int endY;
 22};
 23
 24struct GBAVideoSoftwareBackground {
 25	unsigned index;
 26	int enabled;
 27	unsigned priority;
 28	uint32_t charBase;
 29	uint16_t control;
 30	int mosaic;
 31	int multipalette;
 32	uint32_t screenBase;
 33	int overflow;
 34	int size;
 35	int target1;
 36	int target2;
 37	uint16_t x;
 38	uint16_t y;
 39	int32_t refx;
 40	int32_t refy;
 41	int16_t dx;
 42	int16_t dmx;
 43	int16_t dy;
 44	int16_t dmy;
 45	int32_t sx;
 46	int32_t sy;
 47	int yCache;
 48	uint16_t mapCache[64];
 49	color_t* extPalette;
 50	color_t* variantPalette;
 51	int32_t offsetX;
 52	int32_t offsetY;
 53};
 54
 55enum BlendEffect {
 56	BLEND_NONE = 0,
 57	BLEND_ALPHA = 1,
 58	BLEND_BRIGHTEN = 2,
 59	BLEND_DARKEN = 3
 60};
 61
 62enum {
 63#ifdef COLOR_16_BIT
 64#ifdef COLOR_5_6_5
 65	GBA_COLOR_WHITE = 0xFFDF,
 66#else
 67	GBA_COLOR_WHITE = 0x7FFF,
 68#endif
 69#else
 70	GBA_COLOR_WHITE = 0x00F8F8F8,
 71#endif
 72	OFFSET_PRIORITY = 30,
 73	OFFSET_INDEX = 28,
 74};
 75
 76#define FLAG_PRIORITY       0xC0000000
 77#define FLAG_INDEX          0x30000000
 78#define FLAG_IS_BACKGROUND  0x08000000
 79#define FLAG_UNWRITTEN      0xFC000000
 80#define FLAG_REBLEND        0x04000000
 81#define FLAG_TARGET_1       0x02000000
 82#define FLAG_TARGET_2       0x01000000
 83#define FLAG_OBJWIN         0x01000000
 84#define FLAG_ORDER_MASK     0xF8000000
 85
 86#define IS_WRITABLE(PIXEL) ((PIXEL) & 0xFE000000)
 87
 88struct WindowRegion {
 89	int end;
 90	int start;
 91};
 92
 93DECL_BITFIELD(GBAWindowControl, uint8_t);
 94DECL_BIT(GBAWindowControl, Bg0Enable, 0);
 95DECL_BIT(GBAWindowControl, Bg1Enable, 1);
 96DECL_BIT(GBAWindowControl, Bg2Enable, 2);
 97DECL_BIT(GBAWindowControl, Bg3Enable, 3);
 98DECL_BIT(GBAWindowControl, ObjEnable, 4);
 99DECL_BIT(GBAWindowControl, BlendEnable, 5);
100
101DECL_BITFIELD(GBAMosaicControl, uint16_t);
102DECL_BITS(GBAMosaicControl, BgH, 0, 4);
103DECL_BITS(GBAMosaicControl, BgV, 4, 4);
104DECL_BITS(GBAMosaicControl, ObjH, 8, 4);
105DECL_BITS(GBAMosaicControl, ObjV, 12, 4);
106
107struct WindowControl {
108	GBAWindowControl packed;
109	int8_t priority;
110};
111
112#define MAX_WINDOW 5
113
114struct Window {
115	uint16_t endX;
116	struct WindowControl control;
117};
118
119struct GBAVideoSoftwareRenderer {
120	struct GBAVideoRenderer d;
121
122	color_t* outputBuffer;
123	int outputBufferStride;
124
125	uint32_t* temporaryBuffer;
126
127	uint32_t dispcnt;
128
129	uint32_t row[256];
130	uint32_t spriteLayer[256];
131	uint8_t alphaA[256];
132	uint8_t alphaB[256];
133	int32_t spriteCyclesRemaining;
134
135	// BLDCNT
136	unsigned target1Obj;
137	unsigned target1Bd;
138	unsigned target2Obj;
139	unsigned target2Bd;
140	bool blendDirty;
141	enum BlendEffect blendEffect;
142	color_t normalPalette[512];
143	color_t variantPalette[512];
144	color_t* objExtPalette;
145	color_t* objExtVariantPalette;
146
147	uint16_t blda;
148	uint16_t bldb;
149	uint16_t bldy;
150
151	GBAMosaicControl mosaic;
152
153	struct WindowN {
154		struct WindowRegion h;
155		struct WindowRegion v;
156		struct WindowControl control;
157	} winN[2];
158
159	struct WindowControl winout;
160	struct WindowControl objwin;
161
162	struct WindowControl currentWindow;
163
164	int nWindows;
165	struct Window windows[MAX_WINDOW];
166
167	struct GBAVideoSoftwareBackground bg[4];
168
169	int oamDirty;
170	int oamMax;
171	struct GBAVideoSoftwareSprite sprites[128];
172	int tileStride;
173	int bitmapStride;
174	bool combinedObjSort;
175	int16_t objOffsetX;
176	int16_t objOffsetY;
177
178	uint32_t scanlineDirty[5];
179	uint16_t nextIo[REG_SOUND1CNT_LO];
180	struct ScanlineCache {
181		uint16_t io[REG_SOUND1CNT_LO];
182		int32_t scale[2][2];
183	} cache[GBA_VIDEO_VERTICAL_PIXELS];
184	int nextY;
185
186	int start;
187	int end;
188	int masterEnd;
189	int masterHeight;
190	int masterScanlines;
191
192	int masterBright;
193	int masterBrightY;
194};
195
196void GBAVideoSoftwareRendererCreate(struct GBAVideoSoftwareRenderer* renderer);
197
198CXX_GUARD_START
199
200#endif