Das Tank: display.cpp File Reference

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Functions
void	InitGL (int Width, int Height)
	main OpenGL initialization function
void	DrawGLScene (CWorld *ThisWorld)
	main in-game drawing function
void	DrawHUD (CWorld *ThisWorld)
	draw the heads-up display
void	DrawTiles (CWorld *ThisWorld)
	draw the background tiles
void	DrawObjects (CWorld *ThisWorld)
	draw game world objects
void	UpdateAnimation (CWorld *ThisWorld)
	main animation routine
void	InitStripeAlpha (void)
	utility function to set the drawing stripe to full alpha
void	DrawStripe (float top, float bottom, float alpha)
	draw a horizontal stripe on the screen
void	DrawBarGraph (float top, float bottom, float left, float right, float fillPercent)
	draws a 2D bar graph on the screen at a specified level
void	InitTextures ()
	load textres from disk
GLuint	GetTexture (int texID)
	return the texture handle associated with a texture ID
GLuint	GetFrame (int animID, int frame)
	gets the OpenGL texture ID associated with a particular frame of animation
int	GetTotalFrames (int animID)
	returns the total number of frames contained in an animation
CAnimation *	GetAnimation (int animID)
	returns a pointer to an animation object, given it's animation ID
GLuint	LoadTextureRAW (const char *filename, int wrap)
	load a texture from disk
int	checkSize (int x)
unsigned char *	getRGBA (FILE *s, int size)
unsigned char *	getRGB (FILE *s, int size)
unsigned char *	getGray (FILE *s, int size)
char *	getData (FILE *s, int sz, int iBits)
int	returnError (FILE *s, int error)
GLuint	LoadTextureTGA (const char *filename, int wrap)
	loads a targa image
void	DrawCircle (float radius)
	draw a circle on the screen
void	DrawDisc (float radius)
	draw a disc on the screen
void	DrawStar (float radius)
	draw a 'star' on the screen
Variables
GLuint	textures [256]
CAnimation *	animations [256]
static float	stripeAlpha
GLenum	texFormat

Function Documentation

int checkSize ( int x )

Definition at line 699 of file display.cpp.

Referenced by LoadTextureTGA().

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void DrawBarGraph	(	float	top,
		float	bottom,
		float	left,
		float	right,
		float	fillPercent
	)

This function draws horizontal a 2D bar graph on the screen, allowing the screen position and dimensions to be specified, along with a value representing the percentage of the bar graph to be drawn 'filled'.

Definition at line 478 of file display.cpp.

Referenced by DrawHUD().

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void DrawCircle ( float radius )

Used for various effects, including the 'Shock Wave' effect.

Definition at line 880 of file display.cpp.

References DegreesToRadians().

Referenced by Shockwave::Draw(), and MiniShock::Draw().

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void DrawDisc ( float radius )

Used for various effects, including the 'Shock Wave' and 'Mini Shock' effects.

Definition at line 894 of file display.cpp.

References DegreesToRadians().

Referenced by Shockwave::Draw().

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void DrawGLScene ( CWorld * ThisWorld )

This function draws the in-game graphics. It draws the base tile-map, the world objects, and the special effects.

Definition at line 61 of file display.cpp.

References CWorld::DrawEffects(), DrawHUD(), DrawObjects(), DrawTiles(), CWorld::fFinalZoom, CWorld::fZoomBias, CObject::iHealth, CWorld::iStartingState, Vector::Magnitude(), CWorld::Player, PLAYFIELD_SIZE, CObject::Position, Vector::Reverse(), STARTINGSTATE_GO, STARTINGSTATE_IDLE, STARTINGSTATE_READY, STARTINGSTATE_RUN, STARTINGSTATE_SET, STARTINGSTATE_VICTORY, Vector::x, and Vector::y.

Referenced by PlayGame().

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void DrawHUD ( CWorld * ThisWorld )

Draw the heads-up information display to the screen. This includes game status information such as the players' health (bar graph), the players' current weapon and remaining ammunition, etc.

Definition at line 153 of file display.cpp.

References DrawBarGraph(), GetTexture(), CObject::iHealth, CObject::iWeapon, CWorld::Player, PLAYFIELD_SIZE, TEXID_POWERUP_BS, TEXID_POWERUP_HS, TEXID_POWERUP_LM, TEXID_POWERUP_PS, TEXID_POWERUP_SB, TEXID_TANK, WEAPONID_BOUNCY_SHOT, WEAPONID_HEAT_SEEKER, WEAPONID_LAND_MINE, WEAPONID_NULL, WEAPONID_PEA_SHOT, and WEAPONID_SUPER_BULLET.

Referenced by DrawGLScene().

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void DrawObjects ( CWorld * ThisWorld )

Draw all game world objects to the screen. This includes players, powerups, blocks, and walls. This will also draw 'dead' objects that haven't been removed from the world.

Definition at line 365 of file display.cpp.

References CObject::bVisible, CObject::Draw(), CObject::Next, and CWorld::Objects.

Referenced by DrawGLScene().

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void DrawStar ( float radius )

Used for various effects, including the 'Shock Wave' effect.

Definition at line 908 of file display.cpp.

References DegreesToRadians().

Referenced by Shockwave::Draw().

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void DrawStripe	(	float	top,
		float	bottom,
		float	alpha
	)

Draw a text accentuation stripe to help text stand out when written to the screen. the strip will fade in alpha over time. Use InitStripeAlpha() to reset the stripe's opacity after updating it's position on the screen.

Definition at line 450 of file display.cpp.

References stripeAlpha.

Referenced by PlayGame().

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void DrawTiles ( CWorld * ThisWorld )

Draw the background tiles to the screen. This function uses a tile based method to render the backgound, one tile at a time, pulling data from the current world's tile map data array.

Definition at line 333 of file display.cpp.

References CELL_SIZE, CTile::iTexture, MAP_SIZE, textures, TILEMAP_DISTANCE, and CWorld::tiles.

Referenced by DrawGLScene().

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CAnimation* GetAnimation ( int animID )

Definition at line 635 of file display.cpp.

References animations.

Referenced by TileAnim::Draw(), and TileAnim::Step().

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char* getData	(	FILE *	s,
		int	sz,
		int	iBits
	)

Definition at line 797 of file display.cpp.

References getGray(), getRGB(), and getRGBA().

Referenced by LoadTextureTGA().

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GLuint GetFrame	(	int	animID,
		int	frame
	)

Definition at line 623 of file display.cpp.

References animations, and CAnimation::ipFrameTex.

Referenced by TileAnim::Draw(), and CObject::Draw().

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unsigned char* getGray	(	FILE *	s,
		int	size
	)

Definition at line 774 of file display.cpp.

References texFormat.

Referenced by getData().

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unsigned char* getRGB	(	FILE *	s,
		int	size
	)

Definition at line 741 of file display.cpp.

References texFormat.

Referenced by getData().

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unsigned char* getRGBA	(	FILE *	s,
		int	size
	)

Definition at line 709 of file display.cpp.

References texFormat.

Referenced by getData().

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GLuint GetTexture ( int texID )

Look up the OpenGL texture handle, given the texture ID associated with it.

Definition at line 617 of file display.cpp.

References textures.

Referenced by TileStorm::Draw(), CObject::Draw(), DrawHUD(), and DrawMenuBackground().

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int GetTotalFrames ( int animID )

Definition at line 629 of file display.cpp.

References animations, and CAnimation::iTotalFrames.

void InitGL	(	int	Width,
		int	Height
	)

Sets all of the required OpenGL parameters to the game's defaults. Also sets up the viewing matrix.

Definition at line 36 of file display.cpp.

Referenced by main(), and ToggleFullScreen().

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void InitStripeAlpha ( void )

Definition at line 437 of file display.cpp.

References stripeAlpha.

Referenced by PlayGame().

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void InitTextures ( )

Load all textures from disk and associate them with entries in the texture ID array.

Definition at line 500 of file display.cpp.

References animations, ANIMID_BROWN_HOP_IN, ANIMID_BROWNTANKEXPLODE, ANIMID_CRATECRUSH, ANIMID_EXPLOSION, ANIMID_GREEN_HOP_IN, ANIMID_GREENTANKEXPLODE, ANIMID_TANKROLL, CAnimation::ipFrameTex, LoadTextureTGA(), TEXID_BOUNCY_SHOT, TEXID_CRATE, TEXID_DIRT, TEXID_EZRAS_HEAD, TEXID_GRASS, TEXID_HEAT_SEEKER, TEXID_ICE, TEXID_LAND_MINE, TEXID_LAVA, TEXID_MENUBACK, TEXID_MUD, TEXID_PEA_SHOT, TEXID_POWERUP_BS, TEXID_POWERUP_HEALTH, TEXID_POWERUP_HS, TEXID_POWERUP_LM, TEXID_POWERUP_PS, TEXID_POWERUP_SB, TEXID_SAND, TEXID_SUPER_BULLET, TEXID_TANK, TEXID_TARMAC, TEXID_TNT_BLOCK, TEXID_WALL_BLOCK, TEXID_WATER, and textures.

Referenced by main(), and ToggleFullScreen().

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GLuint LoadTextureRAW	(	const char *	filename,
		int	wrap
	)

Load a 256x256 RGB/8 .RAW file as a texture, and return a handle to it.

Definition at line 645 of file display.cpp.

GLuint LoadTextureTGA	(	const char *	filename,
		int	wrap
	)

Loads a targa (.tga) image file from disk. Supported types are 8, 24 and 32 bit uncompressed images.

Definition at line 820 of file display.cpp.

References checkSize(), getData(), returnError(), TGA_BAD_BITS, TGA_BAD_DATA, TGA_BAD_DIMENSION, TGA_BAD_IMAGE_TYPE, and TGA_FILE_NOT_FOUND.

Referenced by InitTextures().

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int returnError	(	FILE *	s,
		int	error
	)

Definition at line 808 of file display.cpp.

Referenced by LoadTextureTGA().

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void UpdateAnimation ( CWorld * ThisWorld )

Update the animation frames of all the objects in the game world that are currently animating. The routine will update each object's frame using an independent delay variable, referenced to the current world's time.

Definition at line 393 of file display.cpp.

References ANIM_CYCLE_CYCLE, ANIM_CYCLE_ONESHOT, animations, CObject::bAnimating, CObject::bAnimCycle, CObject::iAnimTimeStamp, CObject::iCurrentFrame, CWorld::iCurrentTime, CObject::iNormalAnim, CObject::iNormalAnimSpeed, CAnimation::iTotalFrames, CObject::Next, and CWorld::Objects.