+ f = fopen(filename, "wb");
+ if (!f) {
+ printf("Couldn't open image file: %s\n", filename);
+ free(buffer);
+ free(tile);
+ return;
+ }
+ fprintf(f,"P6\n");
+ fprintf(f,"# ppm-file created by %s\n", "trdemo2");
+ fprintf(f,"%i %i\n", imageWidth, imageHeight);
+ fprintf(f,"255\n");
+
+ /* just to be safe... */
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+
+ /* Because the HUD and Panel change the ViewPort we will
+ * need to handle some lowlevel stuff ourselves */
+ int ncols = trGet(tr, TR_COLUMNS);
+ int nrows = trGet(tr, TR_ROWS);
+
+ bool do_hud = fgGetBool("/sim/hud/visibility");
+ GLfloat hud_col_step = 640.0 / ncols;
+ GLfloat hud_row_step = 480.0 / nrows;
+
+ bool do_panel = fgPanelVisible();
+ GLfloat panel_col_step = current_panel->getWidth() / ncols;
+ GLfloat panel_row_step = current_panel->getHeight() / nrows;
+
+ /* Draw tiles */
+ int more = 1;
+ while (more) {
+ trBeginTile(tr);
+ int curColumn = trGet(tr, TR_CURRENT_COLUMN);
+ int curRow = trGet(tr, TR_CURRENT_ROW);
+ trRenderFrame();
+ if ( do_hud )
+ fgUpdateHUD( curColumn*hud_col_step, curRow*hud_row_step,
+ (curColumn+1)*hud_col_step, (curRow+1)*hud_row_step );
+ if (do_panel)
+ current_panel->update( curColumn*panel_col_step, panel_col_step,
+ curRow*panel_row_step, panel_row_step );
+ more = trEndTile(tr);
+
+ /* save tile into tile row buffer*/
+ int curTileWidth = trGet(tr, TR_CURRENT_TILE_WIDTH);
+ int bytesPerImageRow = imageWidth * 3*sizeof(GLubyte);
+ int bytesPerTileRow = (width) * 3*sizeof(GLubyte);
+ int xOffset = curColumn * bytesPerTileRow;
+ int bytesPerCurrentTileRow = (curTileWidth) * 3*sizeof(GLubyte);
+ int i;
+ for (i=0;i<height;i++) {
+ memcpy(buffer + i*bytesPerImageRow + xOffset, /* Dest */
+ tile + i*bytesPerTileRow, /* Src */
+ bytesPerCurrentTileRow); /* Byte count*/
+ }