UpdateBuffer Class Reference

buffer unique de copie / mise a jour des vertex buffers statiques. singleton. tous les meshs utilisent le meme buffer de copie... More...

Public Member Functions
void	copy (GLenum target, const size_t offset, const size_t length, const void *data)
	transfere les donnees dans un buffer statique. More...
	~UpdateBuffer ()
	detruit le buffer. More...
void	release ()
	detruit le buffer. More...

Static Public Member Functions
static UpdateBuffer &	manager ()
	acces au singleton. More...

Protected Member Functions
	UpdateBuffer ()
	constructeur prive. singleton. More...

Protected Attributes
GLuint	m_buffer
size_t	m_size

Detailed Description

buffer unique de copie / mise a jour des vertex buffers statiques. singleton. tous les meshs utilisent le meme buffer de copie...

Definition at line 522 of file mesh.cpp.

Constructor & Destructor Documentation

~UpdateBuffer()

UpdateBuffer::~UpdateBuffer ( )

inline

detruit le buffer.

Definition at line 550 of file mesh.cpp.

    { 
        release(); 
    }

UpdateBuffer()

UpdateBuffer::UpdateBuffer ( )

inlineprotected

constructeur prive. singleton.

Definition at line 572 of file mesh.cpp.

: m_buffer(0), m_size(0) {}

Member Function Documentation

copy()

void UpdateBuffer::copy ( GLenum  target, const size_t  offset, const size_t  length, const void *  data  )

inline

transfere les donnees dans un buffer statique.

Definition at line 526 of file mesh.cpp.

    {
        if(m_buffer == 0)
            glGenBuffers(1, &m_buffer);
        
        assert(m_buffer);
        glBindBuffer(GL_COPY_READ_BUFFER, m_buffer);
        if(length > m_size)
        {
            m_size= (length / (16*1024*1024) + 1) * (16*1024*1024); // alloue par bloc de 16Mo 
            assert(m_size >= length);
            
            // alloue un buffer intermediaire dynamique...
            glBufferData(GL_COPY_READ_BUFFER, m_size, nullptr, GL_DYNAMIC_DRAW);
            printf("[UpdateBuffer] allocate %dMo staging buffer...\n", int(m_size / 1024 / 1024));
        }
        
        // place les donnees dans le buffer intermediaire
        glBufferSubData(GL_COPY_READ_BUFFER, 0, length, data);
        // copie les donnees dans le vertex buffer statique
        glCopyBufferSubData(GL_COPY_READ_BUFFER, target, 0, offset, length);
    }

release()

void UpdateBuffer::release ( )

inline

detruit le buffer.

Definition at line 556 of file mesh.cpp.

    {
        glDeleteBuffers(1, &m_buffer);
        m_buffer= 0;
        m_size= 0;
    }

manager()

static UpdateBuffer& UpdateBuffer::manager ( )

inlinestatic

acces au singleton.

Definition at line 564 of file mesh.cpp.

    {
        static UpdateBuffer buffer;
        return buffer;
    }

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

• src/gKit/mesh.cpp