Pascal, Assembler Problems in Pascal

Assembler Problems in Pascal

Author	Message
Kevin Robert #1 / 2	Assembler Problems in Pascal I wonder if you can help me. I need some help with assembler. A sprite routine actually. In my routine I have a register, let's say AX which holds the current Y pixel. Now...The problem is...I need to draw some of my sprites above the screen so only part of the sprite is on the map. But what happens is, any thing that's meant to be off the screen (Above it) is displayed in all funny weird positions. It's meant to clip to size but that doesn't help :( Hope you may be able to help me in this matter Kevin Roberts (Spider)
Wed, 18 Jun 1902 08:00:00 GMT

Greg Brelan #2 / 2	Assembler Problems in Pascal Quote: > I wonder if you can help me. I need some help with assembler. A sprite > routine actually. In my routine I have a register, let's say AX which > holds the current Y pixel. Now...The problem is...I need to draw some > of my sprites above the screen so only part of the sprite is on the > map. But what happens is, any thing that's meant to be off the screen > (Above it) is displayed in all funny weird positions. It's meant to > clip to size but that doesn't help :( > Hope you may be able to help me in this matter > Kevin Roberts (Spider) The problem is, is that your Y value is out of range. If the Y value is too large or too samall, it will cause a wrap around effect. This is the same as when your x value is too large and it just wraps around to the left side of the screen. However, the Y value doesn't just wrap around to the top side of the screen when it is too big, instead, it displays the pixels at basically random positions on the screen. Sounds like the routine you have is a general sprite blitting routine. What you need is a routine that checks the x and y values to make sure they are in range, and if not, ajust acordingly. Hope this helps, Greg Brland
Wed, 18 Jun 1902 08:00:00 GMT

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