class csCBuffer

The CBuffer

Public Methods

	csCBuffer (int sx, int ex, int n_lines) Create a new c-buffer with the given dimensions.
void	DumpLine (int y) Dump debug information for a scanline.
void	Initialize () Initialize the c-buffer to empty.
bool	InsertPolygon (csVector2* verts, int num_verts, bool negative = false) Take a polygon and insert all spans in the c-buffer
bool	IsFull () Return true if the screen (c-buffer) is full.
bool	TestPolygon (csVector2* verts, int num_verts) Take a polygon and test if it would have changed the c-buffer
	~csCBuffer () Destroy the c-buffer.

Private Fields

csCBufferSpan*	first_unused List of all unused spans on screen.
bool*	full A value for every line indicating if it is full or not.
csCBufferLine*	lines The lines of this c-buffer.
int	num_lines Number of vertical lines.
int	startx Horizontal start and end (inclusive).
csCBufferLine	vert_line A vertical c-buffer line which is used to indicate which horizontal lines of the c-buffer are full

Private Methods

csCBufferSpan*	AllocSpan () Allocate a span (possible from the unused list).
void	FreeSpan (csCBufferSpan* span) Free a span (put in the unused list).
bool	InsertSpan (int s_spanx, int e_spanx, int y) Take a full span and insert it into the c-buffer line
bool	IsFull (int y) Test if a line is full.
bool	TestSpan (int s_spanx, int e_spanx, int y) Take a full span and test if it would have changed the c-buffer line on insertion

csCBufferLine* lines

The lines of this c-buffer.

int num_lines

Number of vertical lines.

bool* full

A value for every line indicating if it is full or not.

int startx

Horizontal start and end (inclusive).

csCBufferSpan* first_unused

List of all unused spans on screen.

csCBufferLine vert_line

A vertical c-buffer line which is used to indicate which horizontal lines of the c-buffer are full. Again spans indicate not-full regions.

csCBufferSpan* AllocSpan()

Allocate a span (possible from the unused list).

void FreeSpan(csCBufferSpan* span)

Free a span (put in the unused list).

bool TestSpan(int s_spanx, int e_spanx, int y)

Take a full span and test if it would have changed the c-buffer line on insertion. This means that the span is visible.

bool InsertSpan(int s_spanx, int e_spanx, int y)

Take a full span and insert it into the c-buffer line. Return true if the span modified the buffer (i.e. span is visible).

bool IsFull(int y)

Test if a line is full.

csCBuffer(int sx, int ex, int n_lines)

Create a new c-buffer with the given dimensions.

~csCBuffer()

Destroy the c-buffer.

void Initialize()

Initialize the c-buffer to empty.

bool IsFull()

Return true if the screen (c-buffer) is full.

bool TestPolygon(csVector2* verts, int num_verts)

Take a polygon and test if it would have changed the c-buffer. This means that the polygon is visible. Polygon vertices are converted to integer before comparing. Note that this function will work with both clockwise and anti- clockwise oriented polygons and will assume both orientations are visible. Backface culling needs to be done elsewhere.

bool InsertPolygon(csVector2* verts, int num_verts, bool negative = false)

Take a polygon and insert all spans in the c-buffer. Returns true if the polygon is visible. Note that this function will work with both clockwise and anti- clockwise oriented polygons and will assume both orientations are visible. Backface culling needs to be done elsewhere. If 'negative' is true the polygons in inserted inverted.

void DumpLine(int y)

Dump debug information for a scanline.

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(c)opyright by Malte Zöckler, Roland Wunderling
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