BT411/engine/MUNGA_L4/L4VB16.h

#pragma once

#include "..\munga\graph2d.h"
#include "..\munga\time.h"
#include <D3DX9.h>
#include <D3DX9math.h>


class L4graphicsPort;
class GaugeRenderer;

// GLASS: resolve the gauge renderer / main window.  DEFINED in game/btl4main.cpp
// off the REAL app + window pointers it holds as locals -- NOT off the
// `application`/`ghWnd` globals, which are duplicate-defined and bind
// non-deterministically per link under /FORCE (the "duplicate-symbol race" --
// CMakeLists.txt:186), so a newly-added engine TU (L4GLASSWIN) can read NULL.
GaugeRenderer *BTResolveGaugeRenderer();
void          *BTResolveMainWindow();		// HWND (kept void* -- no windows.h dependency)

//########################################################################
//#################### COCKPIT SURROUND (BT_COCKPIT) #####################
//########################################################################
//
// The pod-faithful single-window layout: the 3D world view CENTERED, with the
// six live gauge surfaces composited AROUND it at 1/2 native scale (the pod
// monitors physically clip the eyeport, so the corner MFDs / top-center / etc.
// overlap the view edges) and clickable RIO button lamps.  DEFAULT under
// BT_DEV_GAUGES (BT_COCKPIT=0 falls back to the dock-bottom strip).
//
// The layout is the SINGLE SOURCE OF TRUTH -- computed from the backbuffer
// (canvas) size and consumed by the window sizing, the world viewport, the
// panel/button draw, the aspect calc, and the mouse hit-test.  See L4VB16.cpp.
//
struct BTCockpitBtn
{
	int address;			// RIO buttonGroup address (0x00-0x47)
	int x, y, w, h;			// backbuffer-space rect (full hit target; only the
							//   protruding lamp edge shows after the surface draws over)
	int colorClass;			// 0 = red (MFD), 1 = yellow (radar), 2 = blue (flight)
	int inert;				// 1 = no authored .CTL mapping -> drawn greyed
	const char *label;		// non-NULL (blue flight block) -> face is drawn + labeled
};

struct BTCockpitLayout
{
	int canvasW, canvasH;
	int viewX, viewY, viewW, viewH;					// centered world view
	int surfX[6], surfY[6], surfW[6], surfH[6];		// Heat,Mfd2,Mfd1,Mfd3,sec,Comm dest rects
	BTCockpitBtn buttons[80];						// 5*8 red + 16 yellow + 16 blue = 72
	int buttonCount;
};

extern int gBTGaugeCockpit;						// mode select; set once by btl4main
extern int gBTCockpitCanvasW, gBTCockpitCanvasH;	// backbuffer canvas dims (for the aspect calc)

//
// LETTERBOX FIT (2026-07-26).  The cockpit canvas is a FIXED size -- D3D9
// stretches it into whatever the client area is, so a window dragged to a
// different shape used to squash the instruments (the projection was
// aspect-corrected, but the panels, lamps and MFD glass were not).
//
// Now the canvas is fitted at ONE uniform scale, centred, with the leftover
// left black: the cockpit scales both ways and never distorts, whatever the
// window (drag, maximise, -fit borderless).  D3D9 does the scaling at Present
// time via a destination rect, which D3DSWAPEFFECT_DISCARD forbids -- so the
// WINDOWED swap effect becomes D3DSWAPEFFECT_COPY when the surround is up and
// multisampling is off (COPY cannot multisample).  gBTCockpitLetterbox says
// whether that happened; when it is 0 the old full-client stretch stands, so
// an MSAA run still works, just without the letterbox.
//
extern int gBTCockpitLetterbox;					// 1 = the swap chain can take a dest rect

// The uniform-scale centred rect for a client area.  Returns 1 when it differs
// from the full client (letterboxing needed), 0 when it fills it exactly.
int BTCockpitFitRect(int clientW, int clientH, RECT *out);

// Present destination for the main device window, or NULL for the full client.
const RECT *BTCockpitPresentDest(void *hwnd, RECT *storage);

void BTCockpitCanvasFor(int viewW, int viewH, int *canvasW, int *canvasH);
void BTCockpitComputeLayout(int canvasW, int canvasH, BTCockpitLayout *out);
void BTDrawCockpitPanels(LPDIRECT3DDEVICE9 device);
int  BTCockpitMouseDown(int cx, int cy, int clientW, int clientH, int rightButton); // 1 = consumed
void BTCockpitMouseUp(void);

// Lamp brightness decode (RIOBase::LampState) -- shared by the cockpit draw and
// the glass per-display windows.  Returns 0 (off) / 1 (dim) / 3 (bright).
//
// The wire word is TWO brightness fields plus a flash mode (L4RIO.h [T0]):
//   bits 0-1  solid=0 / flashSlow=1 / flashMed=2 / flashFast=3
//   bits 2-3  state 1 brightness   (state1Off=0, state1Dim=1, state1Bright=3)
//   bits 4-5  state 2 brightness   (state2Off=0, state2Dim=1, state2Bright=3)
// Solid shows state 1; flashing ALTERNATES state 1 and state 2 at a
// 500/250/125 ms half-period.
//
// ⚠ FIXED 2026-07-26: this used to return max(state1,state2) and blank to 0 on
// the alternate phase.  That agrees with the enum only when one state is Off --
// true for the Panic lamp (L4CTRL.cpp flashFast+state1Off+state2Bright) and for
// L4LAMP's off/dim pulse, which is why it went unnoticed -- but L4LAMP.cpp:252
// commands flashFast + state1Dim + state2Bright, a DIM-to-BRIGHT pulse that
// rendered as a hard BRIGHT-to-OFF blink.  RP412's L4MFDVIEW LampLevel has the
// faithful formula; this is it.
inline int BTLampBrightnessOf(int state, unsigned long tick)
{
	int level1 = (state >> 2) & 0x3;
	int level2 = (state >> 4) & 0x3;
	int flash  = state & 0x3;
	if (flash == 0) return level1;
	unsigned long half = (flash == 1) ? 500 : (flash == 2) ? 250 : 125;
	return ((tick / half) & 1) ? level2 : level1;
}

//########################################################################
//######################### Video16BitBuffered ###########################
//########################################################################
//
// X/Y values passed to these routines are assumed to be in
// the VIDEO DISPLAY COORDINATE SYSTEM, with (0,0) at the top left.
//
class Video16BitBuffered :
	public GraphicsDisplay
{
public:
	Video16BitBuffered(int x, int y);

	~Video16BitBuffered();

	Logical
		TestInstance() const;

	void
		ShowInstance(char *indent);

	void
		DrawPoint(
			int color,
			int bitmask,
			Enumeration operation,
			int x, int y
		);

	void
		DrawLine(
			int color,
			int bitmask,
			Enumeration operation,
			int x1, int y1,
			int x2, int y2,
			Logical include_last_pixel
		);

	void
		DrawFilledRectangle(
			int color,
        int bitmask,
			Enumeration operation,
			int x1, int y1,
			int x2, int y2
		);

	void
		DrawText(
			int color,
			int bitmask,
			Enumeration operation,
			Logical opaque,
			int rotation,
			Enumeration fontNumber,
			Logical vertical,
			GraphicsDisplay::Justification justification,
			Rectangle2D	*clippingRectanglePtr,
			char *stringPointer
		);

	void
		DrawBitMap(
			int color,
			int bitmask,
			Enumeration operation,
			int rotation,
			int x, int y,
			BitMap *bitmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		DrawBitMapOpaque(
			int color,
			int background,
			int bitmask,
			Enumeration operation,
			int rotation,
			int x, int y,
			BitMap *bitmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		DrawPixelMap8(
     	int *translation_table,
			int bitmask,
			Enumeration operation,
			Logical opaque,
			int rotation,
			int x, int y,
			PixelMap8	*pixelmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		DrawPixelMap8SingleColor(
			int color,
			int bitmask,
			Enumeration operation,
			int rotation,
			int x, int y,
			PixelMap8	*pixelmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

protected:
	void
		MarkChangedLines(int screenTop, int screenBottom);

	void
		buildDestPointer(
			int x, int y,
			Word **pixelPointer,
			LWord **changed_bit_pointer,
			LWord *changed_bit
		);

	Logical
		valid;
	int
		width,
		changedBitWidth,
		height,
		maximumX,
		maximumY;

	PixelMap16
		pixelBuffer;
	Byte
		*changedLine;
	LWord
		*changedBit;
};


//########################################################################
//################################ SVGA16 ################################
//########################################################################
struct SVGA16Palette
{
	Word
		hardwarePort;
	Logical
		modified;
	Palette8
		paletteData;
	Scalar
		flashAccumulator,
		flashRate;

	enum PaletteID
	{
		maskStates=4
	};
	unsigned char
		mask[maskStates];
	int
  	previousMaskState;
};


class SVGA16 :
	public Video16BitBuffered
{
friend class L4GraphicsPort;		// for palette access

public:
	enum PaletteID {
		NativePalette=0,
		SecondaryPalette,
		AuxiliaryPalette1,
		AuxiliaryPalette2,
		PaletteCount
	};

	SVGA16(
		int mode,
		int width,
		int height,
		int page_size,
		int mem_granularity,
		int bytes_per_line,
		int page_function_pointer,
		int special_interface,
      bool windowed,
	  int *secondaryIndex,
	  int *aux1Index, 
	  int *aux2Index
	);

	~SVGA16();

	Logical
		TestInstance() const;

	void
		ShowInstance(char *indent);

	Logical
		Update(Logical forceall);
	void
		Refresh();
	void
		UpdatePalette();

	void
		FadeToPalettes(Scalar fade_time);
	void
		FadeToWhite(Scalar fade_time);
	void
		FlashPalette(
			int palette_number,
			Scalar rate,
			unsigned char *stateList
		);
	void
		UnflashPalette(int palette_number);

	void
		FunkyVideo(Logical on_off);

	// PPC sync-scramble (phase-14): the modern stand-in for the VGA CRTC
	// Horizontal-Total detune.  FunkyVideo(on) sets scrambleActive; every
	// gauge-surface expansion (DrawDevSurface for the surround, ExpandPlaneToBGRA
	// for the glass windows) then reads the pixelBuffer with a per-SOURCE-ROW
	// horizontal shift so all secondary displays shear together -- authentic by
	// construction (one VGA's detuned sync drives them all).  Returns the source-x
	// offset for a source row, 0 when not scrambling.  Tunable by eye
	// (BT_SCRAMBLE_SHEAR px/line, BT_SCRAMBLE_ROLL px/sec) -- the exact look
	// depended on each pod monitor's H-sync PLL and is not recoverable.
	int
		ScrambleRowShift(int srcRow, int width) const;
	Logical
		scrambleActive;

protected:

   void BuildWindows(unsigned int width, unsigned int height, bool windowed, int *secondaryIndex, int *aux1Gauge, int *aux2Gauge);


	void
		ResetUpdatePosition();

	int
		pageSize,
		pageDelta,
		widthInBytes,
		pageFcnPtr,
		specialInterface;

	int
		currentPageNumber,
     nextPageNumber,
		lineNumber;
	long
		destOffset;
	Byte
		*changedLinePointer;
	Word
		*sourcePointer;
	LWord
		*changedBitPointer;

	enum PaletteFadeState
	{
		staticPalette,
		fadeToWhite,
		whitePalette,
		fadeToColor
	};

	PaletteFadeState
		paletteFadeState;
	Scalar
		fadeAlpha,
		fadeUnitsPerSecond;
	Time
  	previousFadeTime;

	// This array is closely linked to the PaletteID enumeration, above
	SVGA16Palette
		palette[PaletteCount];

private:
	int NUMGAUGEWINDOWS;
   HWND *gaugeWindows;
   LPDIRECT3DDEVICE9 *mDevice;
   D3DPRESENT_PARAMETERS *mPresentParams;
   LPDIRECT3DVERTEXBUFFER9 *mVertBuffers;
   LPDIRECT3DTEXTURE9 *mSurfaces;
   DWORD *mLockFlags;
   RECT *mSurfaceRects;

   int mDisplayToUpdate;

   LPDIRECT3DTEXTURE9 mDevSurfaceTex[10];	// DEV-COMPOSITE: one texture per gauge surface
										// (sec/radar + the 5 MFD bit-planes + the Eng1-3
										// preset-page planes, Gitea #9), on the MAIN device.
public:
	// DEV-COMPOSITE: extract ONE gauge surface from the shared pixelBuffer into
	// mDevSurfaceTex[slot] on the given (main) device + draw it as a quad at (dstX,dstY,
	// dstW,dstH).  monoTint < 0 -> palette-expand (sec/radar, case-0 LUT); monoTint >= 0
	// -> mono bit-plane expand ((word & mask) ? tint : 0) for an MFD plane.  See
	// BTDrawGaugeSurfaces (L4VB16.cpp).
	// rotateCCW: 0 = as-is; 1/3 = display the texture turned 90 degrees (the
	// pod's portrait-mounted secondary CRT; the dev panel unrotates it).
	void DrawDevSurface(LPDIRECT3DDEVICE9 device, int slot, int mask, int paletteID,
						int monoTint, float dstX, float dstY, float dstW, float dstH,
						int rotateCCW = 0);

	// GLASS (per-display windows, L4GLASSWIN): CPU-expand ONE gauge surface (a
	// bit-plane of the shared pixelBuffer) into a 32-bit BGRA image for GDI
	// StretchDIBits -- no D3D.  Same pixel rule as DrawDevSurface: monoTint < 0 ->
	// palette-expand via palette[paletteID]; else fill (word & mask) ? monoTint : 0
	// (monoTint is a 0x00RRGGBB value here, NOT R5G6B5).  rotateQuadrant: 0 = native
	// (outW=bufW, outH=bufH); 1 = 90 CCW / 3 = 90 CW -> transposed (outW=bufH,
	// outH=bufW), for the portrait secondary CRT.  `dst` must hold >= bufW*bufH
	// dwords; the image is written TOP-DOWN.  *outW/*outH receive the produced size.
	void ExpandPlaneToBGRA(int mask, int paletteID, int monoTint, int rotateQuadrant,
						   unsigned long *dst, int *outW, int *outH);
};

//########################################################################
//########################## L4GraphicsPort ##############################
//########################################################################
//
// X/Y values passed to these routines are assumed to be in
// the GRAPHICS COORDINATE SYSTEM, with (0,0) at the bottom left.
//
class L4GraphicsPort :
	public GraphicsPort
{
public:
	enum ChannelEnableID {
		RedChannel,
		GreenChannel,
		BlueChannel,
		AllChannels,

		DirectColor,
		BlankColor,

		RedChannelTransparentZero=0x80,
		GreenChannelTransparentZero,
		BlueChannelTransparentZero,
		AllChannelsTransparentZero
	};

	L4GraphicsPort(
		Video16BitBuffered *graphics_display,
		const char *name,
		int rotation,
		int bit_mask,
		SVGA16::PaletteID palette_ID,
		L4GraphicsPort::ChannelEnableID channel_enable
	);

	~L4GraphicsPort();

	Logical
		TestInstance() const;

	void
		ShowInstance(char *indent);

	void
		SetSecondaryPalette(
			Palette8 *source_palette
		);

	void
		SetAuxiliaryPalette();

	void
		SetColor(
			PaletteTriplet *source_color,
			int color_index
		);

	void
		DrawPoint(
			int color,
			Enumeration operation,
			int x, int y
		);

	void
		DrawLine(
			int color,
			Enumeration operation,
			int x1, int y1,
			int x2, int y2,
			Logical include_last_pixel
		);

	void
		DrawFilledRectangle(
			int color,
			Enumeration operation,
			int x1, int y1,
			int x2, int y2
		);

	void
		DrawText(
			int color,
			Enumeration operation,
			Logical opaque,
			int rotation,
			Enumeration fontNumber,
			Logical vertical,
			GraphicsDisplay::Justification justification,
			Rectangle2D	*clippingRectanglePtr,
			char *stringPointer
		);

	void
		DrawBitMap(
			int color,
			Enumeration operation,
			int rotation,
			int x, int y,
			BitMap *bitmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		DrawBitMapOpaque(
			int color,
        int background,
			Enumeration operation,
			int rotation,
			int x, int y,
			BitMap *bitmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		DrawPixelMap8(
			Enumeration operation,
			Logical opaque,
			int rotation,
			int x, int y,
			PixelMap8	*pixelmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		DrawPixelMap8SingleColor(
     	int color,
			Enumeration operation,
			int rotation,
			int x, int y,
			PixelMap8	*pixelmap,
			int sx1, int sy1, int sx2, int sy2	// these are SOURCE coordinates
		);

	void
		SetPaletteID(SVGA16::PaletteID palette_ID)
			{
				Check(this);
				paletteID = palette_ID;
			}

	void
		SetEnableID(L4GraphicsPort::ChannelEnableID channel_enable)
			{
				Check(this);
				channelEnable = channel_enable;
			}

	int
		GetBitMask()
			{
				Check(this);
				return bitMask;
			}
	// DEV-COMPOSITE (Gitea #9): the dock honors the live reconfigure state --
	// a plane whose channel is currently BlankColor contributes nothing on the
	// pod's shared-word palette LUT, so the dev panel skips drawing it.
	L4GraphicsPort::ChannelEnableID
		GetEnableID()
			{
				Check(this);
				return channelEnable;
			}
	SVGA16::PaletteID
  	paletteID;

protected:
	void
		convertPortPair(
			int *xp,
			int *yp,
			int x,
			int y
		);

	void
		BuildDirectTranslation(
			Palette8 *source_palette
		);

	void
		BuildSecondaryPalette(
			Palette8 *source_palette
		);

	void
		BuildAuxiliaryPalette();

	void
		BuildSecondaryTranslation();

	void
		BuildAuxiliaryTranslation();

	void
		BlankPalette();

	void
		BuildSecondaryColor(
			PaletteTriplet *source_triplet,
			int color_number
		);
	//------------------------------------------------------------
	// Protected data
	//------------------------------------------------------------
	int
		translationTable[256];
	unsigned char
		myColor[256];

	int
		baseRotation,
		bitMask,
		numberOfBits,
		maximumX,
		maximumY;


	L4GraphicsPort::ChannelEnableID
		channelEnable;
};