basic/geometry/IGS/IGS_Texture.cpp

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#include <assert.h>
#include "IGS_Texture.h"
#include "opengl/glos.h"
#include <gl/gl.h>
#include <gl/glaux.h>

//=============================================================================
// Constructor
//
// Description: Constructor
//=============================================================================
IGS_Texture::IGS_Texture():
        mFilename( NULL ),
        mImage( NULL ),
        mTextureNumber( 0 )
{
}

//=============================================================================
// Destructor
//
// Description: Destructor
//=============================================================================
IGS_Texture::~IGS_Texture()
{
        delete[] mFilename;
        mFilename = NULL;


}

//=============================================================================
// GetBuffer
//
// Description: Gets the buffer that this texture uses for rendering
//=============================================================================
const unsigned char* IGS_Texture::GetBuffer() const
{
        return this->mImage->data;
}

//=============================================================================
// GetSizeX
//
// Description: Gets the X size of this texture
//=============================================================================
int IGS_Texture::GetSizeX() const
{
        return this->mImage->sizeX;
}

//=============================================================================
// GetSizeY
//
// Description: Gets the Y size of this texture
//=============================================================================
int IGS_Texture::GetSizeY() const
{
        return this->mImage->sizeY;
}


//=============================================================================
// SetFilename
//
// Description: sets the filename for a particular texture
//=============================================================================
void IGS_Texture::LoadFromDisk()
{
        mImage = auxDIBImageLoad( this->mFilename );
        assert( mImage != NULL );

        GLenum errorcode;
        errorcode = ::glGetError();
        errorcode = ::glGetError();

        ::glEnable( GL_TEXTURE_2D );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glGenTextures( 1, &this->mTextureNumber );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glBindTexture( GL_TEXTURE_2D, this->mTextureNumber );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );

        ::glTexImage2D
        ( 
                GL_TEXTURE_2D, 
                0, 
                GL_RGB,                                 //IAN IMPROVE: we will need an alpha componenet later!
//              this->GetSizeX(), 
//              this->GetSizeY(),
                256,
                256,
                0,
                GL_RGB,
                GL_UNSIGNED_BYTE,
                this->GetBuffer()
        );

        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );
}
//=============================================================================
// MakeActive
//
// Description: sets this texture to be used for texture mapping
//=============================================================================
void IGS_Texture::MakeActive() const
{
        GLenum errorcode;
        errorcode = ::glGetError();
        errorcode = ::glGetError();

        ::glBindTexture( GL_TEXTURE_2D, this->mTextureNumber );
        errorcode = ::glGetError();
        assert( errorcode == GL_NO_ERROR );
}

//=============================================================================
// SetFilename
//
// Description: sets the filename for a particular texture
//=============================================================================
void IGS_Texture::SetFilename( const char* name )
{
        delete[] mFilename;
        mFilename = new char[ strlen( name ) + 1 ];
        strcpy( mFilename, name );
}

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