mathfp.c File Reference

Random numbers, fixed-point arithmetic and trigonometry computed in floating point, and text-cursor and shape-frame helpers. More...

#include "wc1.h"

Go to the source code of this file.

Functions
short	RandomBelow (short n)
void __stdcall	SeedRandomFromClock (int seed)
unsigned short	RandomWord (void)
short __stdcall	RandomInRange (short lo, short hi)
short	RandomBelowOrEqual (short n)
long	MultiplyFixed (int left, int right)
long	DivideFixed (int numerator, int denominator)
long	SinFixed (short degrees)
long	CosFixed (short degrees)
long	ArcSin (int value)
long	ArcCos (int value)
long	Magnitude (int value)
long	PlanarMagnitude (int x, int y)
long	Vector_magnitude (const FixedVector *vector)
void __stdcall	SetTextCursor (unsigned short a, unsigned short b)
void __stdcall	SetTextContext (TextContext *context)
void	WaitForVerticalBlankThunk (void)
void *__stdcall	IdentityHandle (void *v)
void __stdcall	SetWholePaletteFromTriplets (unsigned char *palette)
unsigned short __stdcall	FontHeight (const void *p)
unsigned short __stdcall	GetFontCharWidth (char i)
void	ReleaseVideoResourcesHook (void)
short __stdcall	GetShapeFrameBounds (short *bounds, short x, short y, struct Shape *shape, short frame)
short __stdcall	IsPointInRect (short x, short y, const short *rect)
void __stdcall	SplitPackedPoint (ShortPoint point, short *p)
void __stdcall	DrawTextString (const char *text)
void __stdcall	DrawTextCharacter (char character)
void __stdcall	AppendTextCharacter (char character)
int __stdcall	MeasureShapeFrameStorage (struct Shape *shape, short frame)
void	ResetTextCursor (void)

Variables
short	nPacketDecompressPending
unsigned short	wPacketDecompressInputSize
short	nCurrentPacketDecompressScratchSegment
volatile int	bFrameTickPendingFlag
int	bMouseCursorDamagePending
int	nMouseCursorDamageRight
int	nEventMousePointerDamageBottom
int	nSavedDosInterruptVector
short	nViewportOriginPositionY
short	nViewportOriginPositionX
int	nTickCount60Hz
unsigned char	bEscapePressedFlag
int	nMouseCursorDamageLeft
int	nMousePointerDamageTopValue

Detailed Description

Random numbers, fixed-point arithmetic and trigonometry computed in floating point, and text-cursor and shape-frame helpers.

Address range 434cd0-43540f. The preceding smart unit ends at chase_speed (434c70).

Definition in file mathfp.c.

Function Documentation

AppendTextCharacter()

void __stdcall AppendTextCharacter

(

char

character

)

Definition at line 341 of file mathfp.c.

References AppendTextCharacter(), pCurTextContext, and TextContext::textCursor.

Referenced by AppendFormattedText(), AppendTextCharacter(), DrawNavTextLine(), FormatTextBufferFromStart(), and PlaySfxWaveFileByNumber().

ArcCos()

long ArcCos

(

int

value

)

Definition at line 108 of file mathfp.c.

References ArcCos().

Referenced by ArcCos(), get_right_shape(), match_roll_orientation(), PlaySfxWaveFileByNumber(), rectangular_to_spherical(), and set_background_objects_rotation().

ArcSin()

long ArcSin

(

int

value

)

Definition at line 101 of file mathfp.c.

References ArcSin().

Referenced by ArcSin(), PlaySfxWaveFileByNumber(), and set_ship_rotation_goals().

CosFixed()

long CosFixed

(

short

degrees

)

Definition at line 95 of file mathfp.c.

References CosFixed(), and DEGREES_TO_RADIANS.

Referenced by ConvertSphericalToRectangular(), CosFixed(), draw_target_box(), PlaySfxWaveFileByNumber(), reposition_fixed_child_objects(), rotate_about_i(), rotate_about_j(), and rotate_about_k().

DivideFixed()

long DivideFixed	(	int	numerator,
		int	denominator )

Definition at line 76 of file mathfp.c.

References DivideFixed().

Referenced by accelerate_and_move_object(), apply_force_to_object(), divide_vector(), DivideFixed(), draw_nav_pointer(), IsPointWithinEyeViewCone(), NormalizeFixedVector(), object_collision(), PlaySfxWaveFileByNumber(), real_crash_time(), rectangular_to_spherical(), rotational_acceleration(), set_ship_rotation_goals(), and transform_objects_to_your_view().

DrawTextCharacter()

void __stdcall DrawTextCharacter

(

char

character

)

Definition at line 313 of file mathfp.c.

References TextContext::cursorX, TextContext::cursorY, DrawFontGlyph(), DrawTextCharacter(), TextContext::font, Viewport::left, pCurTextContext, and TextContext::viewport.

Referenced by DrawFormattedText(), DrawTextCharacter(), DrawTextString(), and PlaySfxWaveFileByNumber().

DrawTextString()

void __stdcall DrawTextString

(

const char *

text

)

Definition at line 232 of file mathfp.c.

References TextContext::alignment, ClearDebugPauseFlags(), TextContext::cursorX, TextContext::cursorY, DrawTextCharacter(), DrawTextString(), TextContext::font, Viewport::left, pCurTextContext, PumpMessagesDuringWait(), ShapeFrame::right, Viewport::right, SystemDebugPrintf(), and TextContext::viewport.

Referenced by DrawNavTextLine(), DrawTextAt(), DrawTextString(), FormatTextTokens(), PlaySfxWaveFileByNumber(), and PromptInsertNumberedDisk().

FontHeight()

unsigned short __stdcall FontHeight

(

const void *

p

)

Definition at line 178 of file mathfp.c.

References FontHeight().

Referenced by AnimateTrainSimTitle(), ClearTextInputCharacter(), EraseLastTextInputCharacter(), FontHeight(), InitializeDiskPromptTextContext(), PlaySfxWaveFileByNumber(), ReadTextInput(), and ShowTrainSimHighScores().

GetFontCharWidth()

unsigned short __stdcall GetFontCharWidth

(

char

i

)

Definition at line 184 of file mathfp.c.

References TextContext::font, GetFontCharWidth(), and pCurTextContext.

Referenced by ClearTextInputCharacter(), EraseLastTextInputCharacter(), GetFontCharWidth(), MeasureTextPixelWidthClamped(), and PlaySfxWaveFileByNumber().

GetShapeFrameBounds()

short __stdcall GetShapeFrameBounds	(	short *	bounds,
		short	x,
		short	y,
		struct Shape *	shape,
		short	frame )

Definition at line 195 of file mathfp.c.

References ShapeFrame::bottom, Shape::frameOffsets, GetShapeFrameBounds(), ShapeFrame::left, ShapeFrame::right, and ShapeFrame::top.

Referenced by AlignSpriteFrameToRectCorner(), GetShapeFrameBounds(), GetShapeFrameExtent(), PlaySfxWaveFileByNumber(), RecRoom(), SelectTrainSimMission(), and Title_Sequence().

IdentityHandle()

void *__stdcall IdentityHandle

(

void *

v

)

Definition at line 164 of file mathfp.c.

References IdentityHandle().

Referenced by DecompressPacketSection(), IdentityHandle(), and PlaySfxWaveFileByNumber().

IsPointInRect()

short __stdcall IsPointInRect	(	short	x,
		short	y,
		const short *	rect )

Definition at line 217 of file mathfp.c.

References IsPointInRect().

Referenced by FindMenuRegionAtPoint(), IsPointInRect(), PlaySfxWaveFileByNumber(), SplitPackedPoint(), UpdateRoomMenuCursor(), UpdateTitleMenuCursor(), and UpdateTrainSimMenuCursor().

Magnitude()

long Magnitude

(

int

value

)

Definition at line 115 of file mathfp.c.

References Magnitude().

Referenced by Magnitude(), and PlaySfxWaveFileByNumber().

MeasureShapeFrameStorage()

int __stdcall MeasureShapeFrameStorage	(	struct Shape *	shape,
		short	frame )

Definition at line 349 of file mathfp.c.

References Shape::frameOffsets, and MeasureShapeFrameStorage().

Referenced by InitializeCockpitResources(), MeasureShapeFrameStorage(), and PlaySfxWaveFileByNumber().

MultiplyFixed()

long MultiplyFixed	(	int	left,
		int	right )

Definition at line 67 of file mathfp.c.

References MultiplyFixed().

Referenced by accelerate_and_move_object(), apply_force_to_object(), approach_speed(), ConvertSphericalToRectangular(), dot_product(), draw_nav_pointer(), MultiplyFixed(), object_collision(), PlaySfxWaveFileByNumber(), reposition_fixed_child_objects(), rotate_about_i(), rotate_about_j(), rotate_about_k(), rotational_acceleration(), ScaleFixedVector(), transform_objects_to_your_view(), update_digital_readouts(), vector_cross_product(), and vector_length_in_dir().

PlanarMagnitude()

long PlanarMagnitude	(	int	x,
		int	y )

Definition at line 121 of file mathfp.c.

References PlanarMagnitude().

Referenced by apply_force_to_object(), PlanarMagnitude(), PlaySfxWaveFileByNumber(), rectangular_to_spherical(), and set_ship_rotation_goals().

RandomBelow()

short RandomBelow

(

short

n

)

Definition at line 29 of file mathfp.c.

References RandomBelow().

Referenced by AddRandomTrainSimHighScores(), call_enemy(), check_destroy_target(), Explosion(), init_hazard(), intelligence_events(), Mgloat(), pick_from_list(), pick_regular_maneuver(), PlaySfxWaveFileByNumber(), pop_flack(), RandomBelow(), request(), run_away(), select_target(), skew_randomly(), streak_toward(), and try_far_spot().

RandomBelowOrEqual()

short RandomBelowOrEqual

(

short

n

)

Definition at line 59 of file mathfp.c.

References RandomBelowOrEqual().

Referenced by abandoned(), accelerate_and_move_object(), AddRandomTrainSimHighScores(), any_defense(), asteroid_velocity(), check_for_lost_control(), CheckTargetLockMalfunction(), Create_explosion_debris(), Create_ship_hit_debris(), explode(), fire(), fire_flack(), fire_turrets(), hit_asteroid(), house_keep_objects(), inflict_damage(), init_hazard(), InitializeTrainSimHighScores(), internal_damage(), Mfish_hook(), Mhard_turn(), mine_intelligence(), Mroll_over(), Mtarget_missile(), Mtry2tail(), Mveer_away(), Mwabble(), npc_communication(), perform_maneuver(), pick_from_list(), pick_regular_maneuver(), pilot_hit(), PlaySfxWaveFileByNumber(), pop_flack(), random_radial(), RandomBelowOrEqual(), repair_internal_damage(), ReturnToBriefingLongShot(), rnd_aim(), rnd_sign(), select_safe_target(), select_weighted_value(), send_appropriate_message(), ShowCampaignVictorySequence(), ShowTheEndScreen(), ShowVictoryScreen(), signed_random(), skill_check(), start_lock(), tanker_intelligence(), try2allow_engage(), update_hazards(), veer_random(), and your_internal_damage().

RandomInRange()

short __stdcall RandomInRange	(	short	lo,
		short	hi )

Definition at line 49 of file mathfp.c.

References RandomInRange().

Referenced by AddRandomTrainSimHighScores(), animate_object(), AnimateBarracks(), ChooseRandomSignedMagnitude(), DrawConstellationField(), GameFlow(), generate_stars(), HandleSpaceFlightControls(), house_keep_objects(), InitializeBarracksAnimation(), InitializeConstellationField(), InitializeTrainSimHighScores(), internal_damage(), landing(), make_shard(), MakeRandomNormalizedVector(), malf(), MoveNewCampaign(), new_space_music_changes(), place_exhaust_on_ships(), PlaySfxWaveFileByNumber(), PostMission(), RandomInRange(), RecRoom(), replenish_weapon_energy_bank(), ShowTheEndScreen(), ShowTrainSimHighScores(), ShowVictoryScreen(), start_dust(), update_star_field(), and vid_transmit().

RandomWord()

unsigned short RandomWord

(

void

)

Definition at line 43 of file mathfp.c.

References RandomWord().

Referenced by PlayScrambleHangarScene(), PlaySfxWaveFileByNumber(), and RandomWord().

ReleaseVideoResourcesHook()

void ReleaseVideoResourcesHook

(

void

)

Definition at line 190 of file mathfp.c.

References ReleaseVideoResourcesHook().

Referenced by PlaySfxWaveFileByNumber(), ReleaseVideoResourcesHook(), and ShutdownVideoHook().

ResetTextCursor()

void ResetTextCursor

(

void

)

Definition at line 401 of file mathfp.c.

References TextContext::cursorX, TextContext::cursorY, pCurTextContext, and ResetTextCursor().

Referenced by PlaySfxWaveFileByNumber(), and ResetTextCursor().

SeedRandomFromClock()

void __stdcall SeedRandomFromClock

(

int

seed

)

Definition at line 37 of file mathfp.c.

References SeedRandomFromClock().

Referenced by PlaySfxWaveFileByNumber(), and SeedRandomFromClock().

SetTextContext()

void __stdcall SetTextContext

(

TextContext *

context

)

Definition at line 152 of file mathfp.c.

References pCurTextContext, and SetTextContext().

Referenced by BuildMap(), DeBriefing(), Dismissed(), DrawCockpitReadout(), DrawNavLocationReadout(), DrawRoomMenuLabel(), DrawTextAt(), InflightComputer(), InitializeCockpitResources(), InitializeConversationText(), InitializeGameTextContexts(), InitializeTextContextFromFont(), InitializeTrainSimTextPanel(), LoadBriefingRoom(), PlaySfxWaveFileByNumber(), PromptInsertNumberedDisk(), SelectTrainSimMission(), SetTextContext(), ShowCampaignVictorySequence(), ShowChalkBoard(), ShowMeanwhileTransition(), ShowMemoryStatusDebug(), ShowTigerClawEscapeScene(), ShowTrainSimHighScores(), update_digital_readouts(), update_VDUs(), UpdateArcadeScoreDisplay(), UpdateInflightNavText(), and UpdateMap().

SetTextCursor()

void __stdcall SetTextCursor	(	unsigned short	a,
		unsigned short	b )

Definition at line 145 of file mathfp.c.

References TextContext::cursorX, TextContext::cursorY, pCurTextContext, and SetTextCursor().

Referenced by DrawCockpitReadout(), DrawModalTextPanel(), DrawNavMapLegend(), DrawTextAt(), InitializeCockpitResources(), PlaySfxWaveFileByNumber(), PromptForPilotField(), PromptInsertNumberedDisk(), ReadRequiredPilotField(), ReadTextInput(), SelectTrainSimMission(), SetTextCursor(), ShowTrainSimHighScores(), ShowTrainSimTextMessage(), and UpdateArcadeScoreDisplay().

SetWholePaletteFromTriplets()

void __stdcall SetWholePaletteFromTriplets

(

unsigned char *

palette

)

Definition at line 172 of file mathfp.c.

References DIBwholePaletteFromTriplets(), and SetWholePaletteFromTriplets().

Referenced by FadeViewportPaletteToColour(), LoadPaletteTripletsFile(), PlaySfxWaveFileByNumber(), and SetWholePaletteFromTriplets().

SinFixed()

long SinFixed

(

short

degrees

)

Definition at line 89 of file mathfp.c.

References DEGREES_TO_RADIANS, and SinFixed().

Referenced by ConvertSphericalToRectangular(), draw_target_box(), PlaySfxWaveFileByNumber(), reposition_fixed_child_objects(), rotate_about_i(), rotate_about_j(), rotate_about_k(), and SinFixed().

SplitPackedPoint()

void __stdcall SplitPackedPoint	(	ShortPoint	point,
		short *	p )

Definition at line 226 of file mathfp.c.

References IsPointInRect(), SplitPackedPoint(), ShortPoint::x, and ShortPoint::y.

Referenced by PlaySfxWaveFileByNumber(), and SplitPackedPoint().

Vector_magnitude()

long Vector_magnitude

(

const FixedVector *

vector

)

Definition at line 132 of file mathfp.c.

References Vector_magnitude(), FixedVector::x, FixedVector::y, and FixedVector::z.

Referenced by accelerate_and_move_object(), distance_between_points(), distance_from_point(), draw_nav_pointer(), explosion_shock_wave(), fire_afterburner(), fire_weapon(), GetShipDistanceToNavPoint(), GetVectorMagnitude(), IsPointWithinEyeViewCone(), IsVectorWithinRange(), NormalizeFixedVector(), object_collision(), PlaySfxWaveFileByNumber(), PlaySfxWaveFileByNumber(), real_crash_time(), real_velocity(), rectangular_to_spherical(), RenderSpaceViewFrame(), set_eye_direction_and_position(), set_ship_rotation_goals(), SetFleetOverviewView(), transform_objects_to_your_view(), update_canned_sequence(), update_digital_readouts(), update_objective_location(), vector_length_in_dir(), and Vector_magnitude().

WaitForVerticalBlankThunk()

void WaitForVerticalBlankThunk

(

void

)

Definition at line 158 of file mathfp.c.

References DIBwaitForVerticalBlank(), and WaitForVerticalBlankThunk().

Referenced by PanToScreen(), PlaySfxWaveFileByNumber(), RefreshMemoryStatusOverlay(), RestoreGamePalette(), ShowCampaignVictorySequence(), ShowCarrierLaunchSequence(), ShowOffscreenBuffer(), and WaitForVerticalBlankThunk().

Variable Documentation

bEscapePressedFlag

unsigned char bEscapePressedFlag

Definition at line 24 of file mathfp.c.

Referenced by AnimateScrambleWalk(), AwardCampaignMedal(), Briefing(), death_sequence(), DeBriefing(), ejection_sequence(), funeral_sequence(), funeral_wingman(), HandleSpaceFlightControls(), InflightComputer(), landing(), LaunchPlayerShip(), LoadBriefingRoom(), main(), MainWindowProc(), Office(), PlaySceneAnimation(), PlayScrambleHangarScene(), RecRoom(), SceneDirector(), scramble(), SelectTrainSimMission(), ShowCampaignVictorySequence(), ShowCarrierLaunchSequence(), ShowGameOverScreen(), ShowGetReadyScreen(), ShowTheEndScreen(), ShowTigerClawEscapeScene(), ShowVictoryScreen(), stranded_sequence(), Title_Sequence(), wait_for_end_of_music(), and WaitForMusicOrInput().

bFrameTickPendingFlag

volatile int bFrameTickPendingFlag

Definition at line 16 of file mathfp.c.

Referenced by FrameTimerCallback(), IsFrameTickElapsed(), SetMultimediaTimerCallback(), and WaitForFrameTick().

bMouseCursorDamagePending

int bMouseCursorDamagePending

Definition at line 17 of file mathfp.c.

Referenced by CaptureMouseCursorBackground(), DrawMouseCursor(), and RefreshMouseCursorDisplay().

nCurrentPacketDecompressScratchSegment

short nCurrentPacketDecompressScratchSegment

Definition at line 15 of file mathfp.c.

Referenced by DecompressPacketSection().

nEventMousePointerDamageBottom

int nEventMousePointerDamageBottom

Definition at line 19 of file mathfp.c.

Referenced by CaptureMouseCursorBackground(), DrawMouseCursor(), RefreshMouseCursorDisplay(), and RestoreMouseCursorBackground().

nMouseCursorDamageLeft

int nMouseCursorDamageLeft

Definition at line 25 of file mathfp.c.

Referenced by CaptureMouseCursorBackground(), DrawMouseCursor(), RefreshMouseCursorDisplay(), and RestoreMouseCursorBackground().

nMouseCursorDamageRight

int nMouseCursorDamageRight

Definition at line 18 of file mathfp.c.

Referenced by CaptureMouseCursorBackground(), DrawMouseCursor(), RefreshMouseCursorDisplay(), and RestoreMouseCursorBackground().

nMousePointerDamageTopValue

int nMousePointerDamageTopValue

Definition at line 26 of file mathfp.c.

Referenced by CaptureMouseCursorBackground(), DrawMouseCursor(), RefreshMouseCursorDisplay(), and RestoreMouseCursorBackground().

nPacketDecompressPending

short nPacketDecompressPending

Definition at line 13 of file mathfp.c.

Referenced by DecompressPacketSection().

nSavedDosInterruptVector

int nSavedDosInterruptVector

Definition at line 20 of file mathfp.c.

Referenced by LogMemoryUsage(), and main().

nTickCount60Hz

int nTickCount60Hz

Definition at line 23 of file mathfp.c.

Referenced by AnimateBarracks(), BarracksScreen(), DrawHudMessageSlot(), InflightComputer(), player_input(), PumpWindowMessages(), RecRoom(), and UpdateInputDeviceTransitions().

nViewportOriginPositionX

short nViewportOriginPositionX

Definition at line 22 of file mathfp.c.

Referenced by set_up_screen_viewport().

nViewportOriginPositionY

short nViewportOriginPositionY

Definition at line 21 of file mathfp.c.

Referenced by set_up_screen_viewport().

wPacketDecompressInputSize

unsigned short wPacketDecompressInputSize

Definition at line 14 of file mathfp.c.

Referenced by DecompressPacketSection().