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StelQGLInterleavedArrayVertexBufferBackend Class Reference

Base class for QGL-using vertex buffer backends based on interleaved attribute arrays. More...

#include <StelQGLInterleavedArrayVertexBufferBackend.hpp>

List of all members.

Public Member Functions

virtual void addVertex (const void *const vertexInPtr)
 Add a new vertex to the buffer.
virtual void getVertex (const int index, void *const vertexOutPtr) const
 Get a vertex from the buffer.
virtual void setVertex (const int index, const void *const vertexInPtr)
 Rewrite a vertex in the buffer.
virtual void lock ()
 Lock the buffer. Must be called before drawing.
virtual void unlock ()
 Unlock the buffer. Must be called to modify the buffer after drawing.
virtual void clear ()
 Clear the buffer, removing all vertices.
void projectVertices (StelProjector *projector, class StelQGLIndexBuffer *indexBuffer)
 Use a StelProjector to project vertex positions.
int length () const
 Get the number of vertices in the buffer.
PrimitiveType getPrimitiveType () const
 Return graphics primitive type formed by the vertices of the buffer,.

Protected Member Functions

 StelQGLInterleavedArrayVertexBufferBackend (const PrimitiveType type, const QVector< StelVertexAttribute > &attributes)
 Construct a StelQGLInterleavedArrayVertexBufferBackend.

Protected Attributes

bool locked
 Is the vertex buffer locked (i.e. ready to draw?).
PrimitiveType primitiveType
 Graphics primitive type formed by the vertices of this buffer.
int vertexCount
 Number of vertices in the buffer.
int vertexCapacity
 Number of vertices we have allocated space for.
int vertexBytes
 Size of a single vertex in bytes.
int vertexStride
 Size allocated for a single vertex (size of a vertex in the vertices array).
char * vertices
 Vertices of the buffer.
bool usingProjectedPositions
 Are we using vertex positions projected by a StelProjector?
Vec3fprojectedPositions
 Projected vertex positions to draw when we're projecting vertices with a StelProjector.
int projectedPositionsCapacity
 Allocated space in the projectedPositions array.

Detailed Description

Base class for QGL-using vertex buffer backends based on interleaved attribute arrays.

Vertex attributes are interleaved in a single array instead of having separate arrays for each attribute. E.g. for a vertex format with a Vec3f position and a Vec2f texcoord, the attributes are stored like this:

VVVTTVVVTTVVV...

Note:
This is an internal class of the Renderer subsystem and should not be used elsewhere.

Definition at line 42 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.


Constructor & Destructor Documentation

StelQGLInterleavedArrayVertexBufferBackend::StelQGLInterleavedArrayVertexBufferBackend ( const PrimitiveType  type,
const QVector< StelVertexAttribute > &  attributes 
) [protected]

Construct a StelQGLInterleavedArrayVertexBufferBackend.

Initializes vertex attribute buffers.

Parameters:
type Graphics primitive type stored in the buffer.
attributes Specifications of vertex attributes that will be stored in the buffer.

Member Function Documentation

virtual void StelQGLInterleavedArrayVertexBufferBackend::addVertex ( const void *const   vertexInPtr  )  [virtual]

Add a new vertex to the buffer.

StelVertexBuffer guarantees that when this is called, buffer is not locked and index is in range.

Parameters:
vertexInPtr Pointer to the beginning of the vertex. Data members of the vertex must match vertex attributes of the buffer.

Implements StelVertexBufferBackend.

virtual void StelQGLInterleavedArrayVertexBufferBackend::clear (  )  [inline, virtual]

Clear the buffer, removing all vertices.

The backend implementation might reuse previously allocated storage after clearing, so calling clear() might be more efficient than destroying a buffer and then constructing a new one.

Implements StelVertexBufferBackend.

Definition at line 68 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

PrimitiveType StelQGLInterleavedArrayVertexBufferBackend::getPrimitiveType (  )  const [inline]

Return graphics primitive type formed by the vertices of the buffer,.

Definition at line 92 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

virtual void StelQGLInterleavedArrayVertexBufferBackend::getVertex ( const int  index,
void *const   vertexOutPtr 
) const [virtual]

Get a vertex from the buffer.

StelVertexBuffer guarantees that when this is called, buffer is not locked and index is in range.

Parameters:
index Index of the vertex to read.
vertexOutPtr Pointer to the beginning of the output vertex. Data members of the vertex must match vertex attributes of the buffer.

Implements StelVertexBufferBackend.

int StelQGLInterleavedArrayVertexBufferBackend::length (  )  const [inline]

Get the number of vertices in the buffer.

Definition at line 86 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

virtual void StelQGLInterleavedArrayVertexBufferBackend::lock (  )  [inline, virtual]

Lock the buffer. Must be called before drawing.

Implements StelVertexBufferBackend.

Definition at line 58 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

void StelQGLInterleavedArrayVertexBufferBackend::projectVertices ( StelProjector projector,
class StelQGLIndexBuffer indexBuffer 
)

Use a StelProjector to project vertex positions.

Can be called only immediately before drawing. The projected vertex positions are only used for one draw call - another one might use a different/modified projector or index buffer.

Parameters:
projector Projector to project the vertices.
indexBuffer Index buffer specifying which vertices to project. If NULL, all vertices are projected.
virtual void StelQGLInterleavedArrayVertexBufferBackend::setVertex ( const int  index,
const void *const   vertexInPtr 
) [inline, virtual]

Rewrite a vertex in the buffer.

StelVertexBuffer guarantees that when this is called, buffer is not locked and index is in range.

Parameters:
index Index of the vertex to set.
vertexInPtr Pointer to the beginning of the vertex that will rewrite the vertex in the buffer. Data members of the vertex must match vertex attributes of the buffer.

Implements StelVertexBufferBackend.

Definition at line 53 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

virtual void StelQGLInterleavedArrayVertexBufferBackend::unlock (  )  [inline, virtual]

Unlock the buffer. Must be called to modify the buffer after drawing.

Implements StelVertexBufferBackend.

Definition at line 63 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.


Member Data Documentation

Is the vertex buffer locked (i.e. ready to draw?).

Definition at line 99 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Graphics primitive type formed by the vertices of this buffer.

Definition at line 102 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Projected vertex positions to draw when we're projecting vertices with a StelProjector.

This is a simple array of projected vertex positions (unprojected positions are in the vertices array interleaved with other attributes). usingProjectedPositions is true. The positions are projected by projectVertices().

Definition at line 143 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Allocated space in the projectedPositions array.

Definition at line 146 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Are we using vertex positions projected by a StelProjector?

(Instead of letting OpenGL handle the projection)

This is set to true by projectVertices() and back to false by the draw call immediately after. The projected positions can only be used for one draw call, as for another one the StelProjector might be different/modified.

Definition at line 136 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Size of a single vertex in bytes.

Definition at line 111 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Number of vertices we have allocated space for.

Definition at line 108 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Number of vertices in the buffer.

Definition at line 105 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Size allocated for a single vertex (size of a vertex in the vertices array).

Used for alignment.

Definition at line 116 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.

Vertices of the buffer.

Vertices are stored in an interleaved format; e.g. if the vertex format has a Vec3f vertex and Vec2f texcoord, the vertices are stored like this (every character represents a single float):

VVVTTVVVTTVVV...

Note: On 64bit, this is aligned to 16 bytes by default.

Definition at line 127 of file StelQGLInterleavedArrayVertexBufferBackend.hpp.


The documentation for this class was generated from the following file:
Generated on Thu Jan 31 14:05:46 2013 for Stellarium by  doxygen 1.6.3