T2FrameBuffer_GL.cpp

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#include "ToshiPCH.h"
#include "T2FrameBuffer_GL.h"
#include "T2Render_GL.h"
 
//-----------------------------------------------------------------------------
// Enables memory debugging.
// Note: Should be the last include!
//-----------------------------------------------------------------------------
#include "Core/TMemoryDebugOn.h"
 
TOSHI_NAMESPACE_START
 
T2FrameBuffer::T2FrameBuffer()
{
    m_uiFBO = 0;
 
    for ( TINT i = 0; i < TARRAYSIZE( m_aAttachments ); i++ )
    {
        m_aAttachments[ i ] = 0;
    }
}
 
T2FrameBuffer::~T2FrameBuffer()
{
    Destroy();
}
 
void T2FrameBuffer::Create()
{
    TASSERT( m_uiFBO == 0 );
    TASSERT( !IsCreated() );
 
    glGenFramebuffers( 1, &m_uiFBO );
}
 
GLuint g_uiBoundFBO = 0;
 
void T2FrameBuffer::Bind()
{
    TASSERT( IsCreated() );
 
    if ( g_uiBoundFBO != m_uiFBO )
    {
        g_uiBoundFBO = m_uiFBO;
        glBindFramebuffer( GL_FRAMEBUFFER, m_uiFBO );
    }
}
 
void T2FrameBuffer::Unbind()
{
    if ( g_uiBoundFBO != 0 )
    {
        g_uiBoundFBO = 0;
        glBindFramebuffer( GL_FRAMEBUFFER, 0 );
    }
}
 
void T2FrameBuffer::Destroy()
{
    if ( m_uiFBO != 0 )
    {
        glDeleteFramebuffers( 1, &m_uiFBO );
        m_uiFBO = 0;
 
        for ( TINT i = 0; i < TARRAYSIZE( m_aAttachments ); i++ )
        {
            if ( m_aAttachments[ i ] != 0 )
            {
                T2Render::DestroyTexture( m_aAttachments[ i ] );
                m_aAttachments[ i ] = 0;
            }
        }
 
        if ( m_uiDepthTexture != 0 )
        {
            T2Render::DestroyTexture( m_uiDepthTexture );
            m_uiDepthTexture = 0;
        }
    }
}
 
void T2FrameBuffer::CreateDepthTexture( GLsizei a_iWidth, GLsizei a_iHeight )
{
    TASSERT( IsCreated() );
    TASSERT( a_iWidth > 0 );
    TASSERT( a_iHeight > 0 );
    TASSERT( m_uiDepthTexture == 0 );
 
    T2FrameBuffer::Bind();
    GLuint uiTexture = T2Render::CreateTexture( a_iWidth, a_iHeight, GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_FLOAT, TFALSE, TNULL );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
 
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER );
 
    TFLOAT borderColor[] = { 1.0f, 1.0f, 1.0f, 1.0f };
    glTexParameterfv( GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor );
 
    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, uiTexture, 0 );
    m_uiDepthTexture = uiTexture;
}
 
void T2FrameBuffer::CreateAttachment( TINT a_iAttachment, GLsizei a_iWidth, GLsizei a_iHeight, GLenum a_eInternalFormat, GLenum a_eFormat, GLenum a_ePixelType )
{
    TASSERT( IsCreated() );
    TASSERT( a_iWidth > 0 );
    TASSERT( a_iHeight > 0 );
    TASSERT( m_aAttachments[ a_iAttachment ] == 0 );
 
    T2FrameBuffer::Bind();
    GLuint uiTexture = T2Render::CreateTexture( a_iWidth, a_iHeight, a_eInternalFormat, a_eFormat, a_ePixelType, TFALSE, TNULL );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 
    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + a_iAttachment, GL_TEXTURE_2D, uiTexture, 0 );
    m_aAttachments[ a_iAttachment ] = uiTexture;
}
 
void T2FrameBuffer::SetDrawBuffer( GLenum a_eDrawBuffer )
{
    T2FrameBuffer::Bind();
    glDrawBuffer( GL_NONE );
    glReadBuffer( GL_NONE );
}
 
TOSHI_NAMESPACE_END