C - minimal setup code for drawing graphics

attle · 07 October 2016, 13:08

http://pastebin.com/0tZPWPYX

Trying to get a nice baseline setup code for a game project, but something is wrong.

A custom screen is set up, and I load a 32-col palette. Then I try to draw two lines. But I only get a grey screen with no lines?

Maybe some of the screen/viewport/rasterport stuff is setup in the wrong order?

I borrowed a lot of it from this projet-secret demo.

Help is much appreciated.

alkis · 07 October 2016, 20:05

Just before InitRastPort put the following:

Code:

  ras_info1.BitMap = &bit_map1;
  ras_info1.RxOffset = 0;
  ras_info1.RyOffset = 0;
  ras_info1.Next = NULL;

attle · 09 October 2016, 18:36

Thanks alkis!

That makes sense, since there was nothing associating the raster port and the bitmap.

attle · 06 February 2017, 22:07

I have discovered something annoying about this setup code. It needs Workbench to be running in order to work. If I run the executable from an ADF, the screen BitMap is not visible, only the AmigaDOS shell window behind.

If I put LoadWB first in Startup-Sequence it works. But I'd rather not.

Is the code relying on a public WB screen being open?

07 October 2016, 13:08	#1
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	C - minimal setup code for drawing graphics http://pastebin.com/0tZPWPYX Trying to get a nice baseline setup code for a game project, but something is wrong. A custom screen is set up, and I load a 32-col palette. Then I try to draw two lines. But I only get a grey screen with no lines? Maybe some of the screen/viewport/rasterport stuff is setup in the wrong order? I borrowed a lot of it from this projet-secret demo. Help is much appreciated.

07 October 2016, 20:05	#2
alkis Registered User Join Date: Dec 2010 Location: Athens/Greece Age: 53 Posts: 719	Just before InitRastPort put the following: Code: ras_info1.BitMap = &bit_map1; ras_info1.RxOffset = 0; ras_info1.RyOffset = 0; ras_info1.Next = NULL;

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09 October 2016, 18:36	#3
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	Thanks alkis! That makes sense, since there was nothing associating the raster port and the bitmap.

06 February 2017, 22:07	#4
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	I have discovered something annoying about this setup code. It needs Workbench to be running in order to work. If I run the executable from an ADF, the screen BitMap is not visible, only the AmigaDOS shell window behind. If I put LoadWB first in Startup-Sequence it works. But I'd rather not. Is the code relying on a public WB screen being open?

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