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C-/C++-Quelltext

void Map::RenderBackground()
    {
        if(!m_BackgroundLayer) return;
        for (int x = 0; x < m_BackgroundLayer->GetWidth(); ++x) 
        {
            for (int y = 0; y < m_BackgroundLayer->GetHeight(); ++y) 
            {
                int CurTile = m_BackgroundLayer->GetTileId(x, (m_BackgroundLayer->GetHeight()-y)-1);

                if(CurTile == 0)
                {
                    continue;
                }

                int tileset_col = (CurTile % m_NumCols);
                int tileset_row = (CurTile / m_NumCols);

                int drawX = x * (m_Tileset->GetTileWidth());
                int drawY = y * (m_Tileset->GetTileHeight());

                Rectangle rect_CurTile;
                rect_CurTile.left = (GLfloat)(m_Tileset->GetSpacing() + (m_TileTotalWidth * tileset_col));
                rect_CurTile.bottom =  (GLfloat)(m_Tileset->GetImage()->GetHeight() - (m_Tileset->GetMargin() + (m_TileTotalHeight * tileset_row)));
                rect_CurTile.right = (GLfloat)(rect_CurTile.left + m_Tileset->GetTileWidth());
                rect_CurTile.top = (GLfloat)(rect_CurTile.bottom - m_Tileset->GetTileHeight());

                rect_CurTile.left /= m_Tileset->GetImage()->GetWidth();
                rect_CurTile.top /= m_Tileset->GetImage()->GetHeight();
                rect_CurTile.right /= m_Tileset->GetImage()->GetWidth();
                rect_CurTile.bottom /= m_Tileset->GetImage()->GetHeight();

                m_TilesetTexture->RenderSection(drawX*m_Scale,drawY*m_Scale,&rect_CurTile,m_Scale,m_Scale);
            }
        }}

C-/C++-Quelltext

void Texture::RenderSection(GLfloat x, GLfloat y, Rectangle* _rect, GLfloat scaleX /* = 1 */, GLfloat scaleY /* = 1 */, GLfloat _rotation /* = 0 */, GLfloat _red /* = 1 */, GLfloat _green /* = 1 */, GLfloat _blue /* = 1 */, GLfloat _alpha /* = 1 */)
    {
        glPushMatrix();

        //bind texture
        glBindTexture(GL_TEXTURE_2D, m_Texture);

        glTranslatef(x,  y, 0.0f);
        if(Rotation != 0)
        {
            GLfloat x, y;
            x = ((rect->right - rect->left)/2)   * m_Width;
            y = ((rect->top   - rect->bottom)/2) * m_Height;

            glTranslatef(x ,y, 0.0f);
            glRotatef(Rotation,0.0f,0.0f,1.0f);
            glTranslatef(-x ,-y, 0.0f);
        }
    glScalef(scaleX, scaleY, 0);
        //width for drawing
        int32 box_width = ceil(m_Width * (_rect->right - _rect->left));
        int32 box_height = ceil(m_Height * ( _rect->bottom - _rect->top ));

        GLfloat box_top = 1.0f - _rect->top;
        GLfloat box_bottom  = 1.0f - _rect->bottom;

        //draw the quad
        glBegin(GL_QUADS);
        //bottom-left vertex (corner)
        glColor4f(_red, _green, _blue, _alpha);
        glTexCoord2f(_rect->left, box_top);
        glVertex2f(0, 0);

        //bottom-right vertex (corner) 
        glTexCoord2f(_rect->right , box_top);
        glVertex2f((GLfloat)box_width, 0);

        //top-right vertex (corner)  
        glTexCoord2f(_rect->right , box_bottom);
        glVertex2f((GLfloat)box_width, (GLfloat)box_height);

        //top-left vertex (corner) 
        glTexCoord2f(_rect->left , box_bottom);
        glVertex2f(0, (GLfloat)box_height);

        glEnd();

        //reset the color
        glColor3f(1.0f, 1.0f, 1.0f);

        glPopMatrix();
    }