ParaTerrain::TerrainBuffer Class Reference

it contains all the necessary dynamic information to render the terrain for the current frame. More...

#include <TerrainBuffer.h>

Public Member Functions
VertexBufferDevicePtr_type	GetVertexBufferDevicePtr ()
void	DeleteDeviceObjects ()
	called internally by the terrain object
void	RebuildBuffer ()
	rebuild the terrain buffer from last tessellation data of the terrain object. More...
bool	HasData ()
	return true if the buffer contains valid data for rendering
void	BuildGeoMipmapBuffer ()
int	GetChunkVertexOffset (int x, int y)

Public Attributes
Terrain *	m_pTerrain
	the terrain object for which this buffer is built
Matrix4	matModelview
	current camera model view matrix
ParaVertexBuffer	m_pVertexBuffer
	the dynamic vertex buffer which hold a triangle vertex array
int	m_nBufferSize
	number of reserved triangles in buffer
int	m_nNumOfTriangles
	total number of vertices
TextureGroups_Type	m_textureGroups
	groups of object ordered by texture

Detailed Description

it contains all the necessary dynamic information to render the terrain for the current frame.

terrain buffer is only rebuilt when the model view matrix has changed, otherwise the old terrain buffer is used for rendering the terrain. E.g. The buffer contains triangle groups sorted by textures. either low-res and high-res textures are specified.

Member Function Documentation

RebuildBuffer()

void TerrainBuffer::RebuildBuffer

(

)

rebuild the terrain buffer from last tessellation data of the terrain object.

this is the most time consuming task compared with tessellation and repair crack

these data are mainly triangle fans and strips.

add get the total number of triangles for each texture group

set the start triangle index of each texture group

recreate buffer, if the old buffer is too small.

reuse the old buffer

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The documentation for this class was generated from the following files:

• Client/trunk/ParaEngineClient/terrain/TerrainBuffer.h
• Client/trunk/ParaEngineClient/terrain/TerrainBuffer.cpp