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mgba/src/gba/video.h

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/* Copyright (c) 2013-2015 Jeffrey Pfau
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GBA_VIDEO_H
#define GBA_VIDEO_H
#include "util/common.h"
#include "gba/memory.h"
#include "macros.h"
#ifdef COLOR_16_BIT
#define BYTES_PER_PIXEL 2
#else
#define BYTES_PER_PIXEL 4
#endif
#define GBA_R5(X) ((X) & 0x1F)
#define GBA_G5(X) (((X) >> 5) & 0x1F)
#define GBA_B5(X) (((X) >> 10) & 0x1F)
#define GBA_R8(X) (((X) << 3) & 0xF8)
#define GBA_G8(X) (((X) >> 2) & 0xF8)
#define GBA_B8(X) (((X) >> 7) & 0xF8)
enum {
VIDEO_HORIZONTAL_PIXELS = 240,
VIDEO_HBLANK_PIXELS = 68,
VIDEO_HDRAW_LENGTH = 1006,
VIDEO_HBLANK_LENGTH = 226,
VIDEO_HORIZONTAL_LENGTH = VIDEO_HDRAW_LENGTH + VIDEO_HBLANK_LENGTH,
VIDEO_VERTICAL_PIXELS = 160,
VIDEO_VBLANK_PIXELS = 68,
VIDEO_VERTICAL_TOTAL_PIXELS = VIDEO_VERTICAL_PIXELS + VIDEO_VBLANK_PIXELS,
VIDEO_TOTAL_LENGTH = VIDEO_HORIZONTAL_LENGTH * VIDEO_VERTICAL_TOTAL_PIXELS,
REG_DISPSTAT_MASK = 0xFF38,
BASE_TILE = 0x00010000
};
enum ObjMode {
OBJ_MODE_NORMAL = 0,
OBJ_MODE_SEMITRANSPARENT = 1,
OBJ_MODE_OBJWIN = 2
};
enum ObjShape {
OBJ_SHAPE_SQUARE = 0,
OBJ_SHAPE_HORIZONTAL = 1,
OBJ_SHAPE_VERTICAL = 2
};
DECL_BITFIELD(GBAObjAttributesA, uint16_t);
DECL_BITS(GBAObjAttributesA, Y, 0, 8);
DECL_BIT(GBAObjAttributesA, Transformed, 8);
DECL_BIT(GBAObjAttributesA, Disable, 9);
DECL_BIT(GBAObjAttributesA, DoubleSize, 9);
DECL_BITS(GBAObjAttributesA, Mode, 10, 2);
DECL_BIT(GBAObjAttributesA, Mosaic, 12);
DECL_BIT(GBAObjAttributesA, 256Color, 13);
DECL_BITS(GBAObjAttributesA, Shape, 14, 2);
DECL_BITFIELD(GBAObjAttributesB, uint16_t);
DECL_BITS(GBAObjAttributesB, X, 0, 9);
DECL_BITS(GBAObjAttributesB, MatIndex, 9, 5);
DECL_BIT(GBAObjAttributesB, HFlip, 12);
DECL_BIT(GBAObjAttributesB, VFlip, 13);
DECL_BITS(GBAObjAttributesB, Size, 14, 2);
DECL_BITFIELD(GBAObjAttributesC, uint16_t);
DECL_BITS(GBAObjAttributesC, Tile, 0, 10);
DECL_BITS(GBAObjAttributesC, Priority, 10, 2);
DECL_BITS(GBAObjAttributesC, Palette, 12, 4);
struct GBAObj {
GBAObjAttributesA a;
GBAObjAttributesB b;
GBAObjAttributesC c;
uint16_t d;
};
union GBAOAM {
struct GBAObj obj[128];
struct GBAOAMMatrix {
int16_t padding0[3];
int16_t a;
int16_t padding1[3];
int16_t b;
int16_t padding2[3];
int16_t c;
int16_t padding3[3];
int16_t d;
} mat[32];
uint16_t raw[512];
};
#define GBA_TEXT_MAP_TILE(MAP) ((MAP) & 0x03FF)
#define GBA_TEXT_MAP_HFLIP(MAP) ((MAP) & 0x0400)
#define GBA_TEXT_MAP_VFLIP(MAP) ((MAP) & 0x0800)
#define GBA_TEXT_MAP_PALETTE(MAP) (((MAP) & 0xF000) >> 12)
DECL_BITFIELD(GBARegisterDISPCNT, uint16_t);
DECL_BITS(GBARegisterDISPCNT, Mode, 0, 3);
DECL_BIT(GBARegisterDISPCNT, Cgb, 3);
DECL_BIT(GBARegisterDISPCNT, FrameSelect, 4);
DECL_BIT(GBARegisterDISPCNT, HblankIntervalFree, 5);
DECL_BIT(GBARegisterDISPCNT, ObjCharacterMapping, 6);
DECL_BIT(GBARegisterDISPCNT, ForcedBlank, 7);
DECL_BIT(GBARegisterDISPCNT, Bg0Enable, 8);
DECL_BIT(GBARegisterDISPCNT, Bg1Enable, 9);
DECL_BIT(GBARegisterDISPCNT, Bg2Enable, 10);
DECL_BIT(GBARegisterDISPCNT, Bg3Enable, 11);
DECL_BIT(GBARegisterDISPCNT, ObjEnable, 12);
DECL_BIT(GBARegisterDISPCNT, Win0Enable, 13);
DECL_BIT(GBARegisterDISPCNT, Win1Enable, 14);
DECL_BIT(GBARegisterDISPCNT, ObjwinEnable, 15);
DECL_BITFIELD(GBARegisterDISPSTAT, uint16_t);
DECL_BIT(GBARegisterDISPSTAT, InVblank, 0);
DECL_BIT(GBARegisterDISPSTAT, InHblank, 1);
DECL_BIT(GBARegisterDISPSTAT, Vcounter, 2);
DECL_BIT(GBARegisterDISPSTAT, VblankIRQ, 3);
DECL_BIT(GBARegisterDISPSTAT, HblankIRQ, 4);
DECL_BIT(GBARegisterDISPSTAT, VcounterIRQ, 5);
DECL_BITS(GBARegisterDISPSTAT, VcountSetting, 8, 8);
DECL_BITFIELD(GBARegisterBGCNT, uint16_t);
DECL_BITS(GBARegisterBGCNT, Priority, 0, 2);
DECL_BITS(GBARegisterBGCNT, CharBase, 2, 2);
DECL_BIT(GBARegisterBGCNT, Mosaic, 6);
DECL_BIT(GBARegisterBGCNT, 256Color, 7);
DECL_BITS(GBARegisterBGCNT, ScreenBase, 8, 5);
DECL_BIT(GBARegisterBGCNT, Overflow, 13);
DECL_BITS(GBARegisterBGCNT, Size, 14, 2);
DECL_BITFIELD(GBARegisterBLDCNT, uint16_t);
DECL_BIT(GBARegisterBLDCNT, Target1Bg0, 0);
DECL_BIT(GBARegisterBLDCNT, Target1Bg1, 1);
DECL_BIT(GBARegisterBLDCNT, Target1Bg2, 2);
DECL_BIT(GBARegisterBLDCNT, Target1Bg3, 3);
DECL_BIT(GBARegisterBLDCNT, Target1Obj, 4);
DECL_BIT(GBARegisterBLDCNT, Target1Bd, 5);
DECL_BITS(GBARegisterBLDCNT, Effect, 6, 2);
DECL_BIT(GBARegisterBLDCNT, Target2Bg0, 8);
DECL_BIT(GBARegisterBLDCNT, Target2Bg1, 9);
DECL_BIT(GBARegisterBLDCNT, Target2Bg2, 10);
DECL_BIT(GBARegisterBLDCNT, Target2Bg3, 11);
DECL_BIT(GBARegisterBLDCNT, Target2Obj, 12);
DECL_BIT(GBARegisterBLDCNT, Target2Bd, 13);
struct GBAVideoRenderer {
void (*init)(struct GBAVideoRenderer* renderer);
void (*reset)(struct GBAVideoRenderer* renderer);
void (*deinit)(struct GBAVideoRenderer* renderer);
uint16_t (*writeVideoRegister)(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
void (*writeVRAM)(struct GBAVideoRenderer* renderer, uint32_t address);
void (*writePalette)(struct GBAVideoRenderer* renderer, uint32_t address, uint16_t value);
void (*writeOAM)(struct GBAVideoRenderer* renderer, uint32_t oam);
void (*drawScanline)(struct GBAVideoRenderer* renderer, int y);
void (*finishFrame)(struct GBAVideoRenderer* renderer);
void (*getPixels)(struct GBAVideoRenderer* renderer, unsigned* stride, const void** pixels);
void (*putPixels)(struct GBAVideoRenderer* renderer, unsigned stride, void* pixels);
uint16_t* palette;
uint16_t* vram;
union GBAOAM* oam;
bool disableBG[4];
bool disableOBJ;
};
struct GBAVideo {
struct GBA* p;
struct GBAVideoRenderer* renderer;
// VCOUNT
int vcount;
int32_t nextHblank;
int32_t nextEvent;
int32_t eventDiff;
int32_t nextHblankIRQ;
int32_t nextVblankIRQ;
int32_t nextVcounterIRQ;
uint16_t palette[SIZE_PALETTE_RAM >> 1];
uint16_t* vram;
union GBAOAM oam;
int32_t frameCounter;
int frameskip;
int frameskipCounter;
};
void GBAVideoInit(struct GBAVideo* video);
void GBAVideoReset(struct GBAVideo* video);
void GBAVideoDeinit(struct GBAVideo* video);
void GBAVideoAssociateRenderer(struct GBAVideo* video, struct GBAVideoRenderer* renderer);
int32_t GBAVideoProcessEvents(struct GBAVideo* video, int32_t cycles);
void GBAVideoWriteDISPSTAT(struct GBAVideo* video, uint16_t value);
struct GBASerializedState;
void GBAVideoSerialize(const struct GBAVideo* video, struct GBASerializedState* state);
void GBAVideoDeserialize(struct GBAVideo* video, const struct GBASerializedState* state);
extern const int GBAVideoObjSizes[16][2];
#endif
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