code von openGL in C Sharp

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void Visuals::DrawSpriteOntoScreenBuffer(Uint16 index)

{

    glPushMatrix();

    glBindTexture(GL_TEXTURE_2D, Sprites[index].OGL_Texture);

    glEnable(GL_TEXTURE_2D);

    glTranslatef(Sprites[index].ScreenX, Sprites[index].ScreenY, 1.0f);

    glScalef(Sprites[index].ScaleX, Sprites[index].ScaleY, 1.0f);

    glRotatef(Sprites[index].RotationDegree, 0.0f, 0.0f, 1.0f);

    glColor4f(Sprites[index].redHue, Sprites[index].greenHue, Sprites[index].blueHue

              , Sprites[index].Transparency);

    if (Sprites[index].AnimationTimerOne > -1)  Sprites[index].AnimationTimerOne--;

    if (Sprites[index].Smooth == false)

    {

    }

    else

    {

        glEnable(GL_BLEND);

        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    }

    GLfloat xMin = 0.0f; GLfloat xMax = 0.0f;

    GLfloat yMin = 0.0f; GLfloat yMax = 0.0f;

    if (Sprites[index].FlipX == false && Sprites[index].FlipY == false)

    {

        xMin = 0-(Sprites[index].Width/2); xMax = 0+(Sprites[index].Width/2);

        yMin = 0-(Sprites[index].Height/2); yMax = 0+(Sprites[index].Height/2);

    }

    else if (Sprites[index].FlipX == true && Sprites[index].FlipY == false)

    {

        xMin = 0+(Sprites[index].Width/2); xMax = 0-(Sprites[index].Width/2);

        yMin = 0-(Sprites[index].Height/2); yMax = 0+(Sprites[index].Height/2);

    }

    else if (Sprites[index].FlipX == false && Sprites[index].FlipY == true)

    {

        xMin = 0-(Sprites[index].Width/2); xMax = 0+(Sprites[index].Width/2);

        yMin = 0+(Sprites[index].Height/2); yMax = 0-(Sprites[index].Height/2);

    }

    else if (Sprites[index].FlipX == true && Sprites[index].FlipY == true)

    {

        xMin = 0+(Sprites[index].Width/2); xMax = 0-(Sprites[index].Width/2);

        yMin = 0+(Sprites[index].Height/2); yMax = 0-(Sprites[index].Height/2);

    }

    glBegin( GL_QUADS );

        glTexCoord3f(0.0f, 0.0f, 1.0f);

        glVertex3f(xMin, yMin, 0.0f );

        glTexCoord3f(1.0f, 0.0f, 1.0f);

        glVertex3f(xMax, yMin, 0.0f );

        glTexCoord3f(1.0f, 1.0f, 1.0f);

        glVertex3f(xMax, yMax, 0.0f );

        glTexCoord3f(0.0f, 1.0f, 1.0f);

        glVertex3f(xMin, yMax, 0.0f );

    glEnd();

    glPopMatrix();

}

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