Comment cosmetic ;)

targets/mega65/vic4.c

@@ -1171,9 +1171,11 @@ static void vic4_render_char_raster ( void )
 				color_data = (color_data << 8) | (*(colour_ram_current_ptr++));
 				char_value = char_value | (*(screen_ram_current_ptr++) << 8);
 				if (XEMU_UNLIKELY(SXA_GOTO_X(color_data))) {
-					// Start of the GOTOX functionality implementation, tricky one.
+					// Start of the GOTOX re-positioning functionality implementation, tricky one.
 					xcounter = (char_value & 0x3FF);	// first, extract the goto to X value as an usigned number
 					if (REG_H640) {
+						// Interpret as a "negative" value compared to xcounter_start if it would fit into the real range of 0-xcounter_start,
+						// otherwise interpret that as a positive offset compared to xcounter_start
 						if (0x3FF - xcounter < xcounter_start)
 							xcounter = xcounter_start - (0x3FF - xcounter);
 						else
@@ -1185,12 +1187,15 @@ static void vic4_render_char_raster ( void )
 						else
 							xcounter += xcounter_start;
 					}
+					// The ugly: too large goto X values may cause out-of-bound access on eg is_fg buffer. Thus, if the result is larger than
+					// the width of the SDL texture, it won't be seen anyway, so we "clamp" it for the NEXT raster as an ugly solution, which
+					// will be overwritten anyway on rendering in the next raster. This way we don't need checking of out-of-bound access (faster
+					// code).
 					if (xcounter > TEXTURE_WIDTH)
 						xcounter = TEXTURE_WIDTH;
-					//// FIXME: I am not sure if it cannot cause out-of-bound access later in some cases, somewhere, caused by GOTOX stuff before
-					//xcounter = xcounter_start + ((char_value & 0x3FF) << (REG_H640 ? 0 : 1));
-					//DEBUGPRINT("xcounter_start = %d" NL, xcounter_start);
+					// Align current_pixel pointer according the calculated xcounter "horror show" above
 					current_pixel = pixel_raster_start + xcounter;
+					// End of the GOTOX re-positioning functionality implementation
 					line_char_index++;
 					char_fetch_offset = char_value >> 13;
 					if (SXA_VERTICAL_FLIP(color_data))