@Karlos


IIRC CGX API is supported across all the platforms Classic, AROS, OS4+, MorphOS. So unless you're looking for OS specific versions CGX would make the most sense.

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@terminills

It was always my goto RTG API for 3.x, and almost everything worked the same on p96 on mediator, UAE and OS4. However, I believe the OP wants to use p96 and that it's had recent development. To be honest, I think if you want to do basic software rendering to a surface, both API have you covered. You lock a bitmap, get the address and do your thing.

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@Karlos

I suppose if you set the screen mode you don't need to worry so much about what depth it is.

There is GetBitMapAttr() as well if that can work. I never understood the tags being in steps of 4. Couldn't correlate that to any field offset so seems strange to do that.

@Drule

Quote:

OK, so with that in mind, could you post a code example of how to render 32-bit ARGB with the graphics.library alone. I'm evidently missing something.

If your Amiga hardware supports it, it can be done. You just need to avoid functions specific to planar. And use functions that can act generically. You need BOOPSI, datatypes as well as graphics,

So you need your ARGB in a picture format such as on disk. Load it in using NewDTObject() from datatypes.library. Can also be in memory from OS3.5 V44.

You can use BOOPSI functions to render into a window. Or, if you just want to render direct to screen, simply use BlitBitMap(). Classic function there.

You're right. Example code. I'm going from the top of my head when I figured it out years ago.

@salass00

It’s strange because in OS3.1.4 they got a new intuition.library, with of window dragging support out side of screen. AmigaOS3.2 is actually released after AmigaOS4.1FE Classic. By the same company.

Last edited by NutsAboutAmiga on 15-Dec-2022 at 12:48 AM.

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@Drule

Here is diff between AmigaOS3.2 NDK and AmigaOS4.1 SDK
graphics.library

7a8
graphics.library/AllocBitMapTagList
26a28
> graphics.library/BltBitMapTagList
36a39
> graphics.library/CINIT
45a49
> graphics.library/CompositeTagList
61a66,67
> graphics.library/FreeCopList
> graphics.library/FreeCprList
66a73
> graphics.library/FreeVPortCopLists
68a76,77
> graphics.library/GetBoardBytesPerRow
> graphics.library/GetBoardDataTagList
74a84
> graphics.library/GetMonitorDataTagList
78c88
< graphics.library/GetRPAttrA
---
> graphics.library/GetRPAttrsA
83c93
< graphics.library/GfxLookUP
---
> graphics.library/GfxLookUp
84a95
> graphics.library/GraphicsControlTagList
96a108,109
> graphics.library/LockBitMapTagList
> graphics.library/LockBitMapToBoardTagList
115a129
> graphics.library/ReadPixelArray
116a131
> graphics.library/ReadPixelColor
118a134
> graphics.library/RectFillColor
143c159
< graphics.library/SetRPAttrA
---
> graphics.library/SetRPAttrsA
153c169,170
< graphics.library/UCopperListInit
---
> graphics.library/UnlockBitMap
> graphics.library/UnlockBitMapFromBoard
157d173
< graphics.library/VPOrigin
162a179
> graphics.library/WritePixelArray
163a181
> graphics.library/WritePixelColor
167,169c185,187
< graphics.library/CMove
< graphics.library/CWait

Last edited by NutsAboutAmiga on 14-Dec-2022 at 10:35 PM.

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@Drule

As you can see SDK4.1 introduces bitmap locking, and functions to draw using 32bit, instead of functions that uses pens. You also see renamed some functions coursing problems when you try to compile stuff.
Interestingly they added CINIT, FreeCopList, that technically none useable on a pure RTG system, and not available AmigaOS3.2, but they removed CMove and CWait.

AmigaOS3.2 / graphic library does not have Important functions like LockBitMapTagList, UnlockBitMap, this means you can’t do any safe reads and writes to bitmap memory directly. (there is also a function name conflict with Cyber graphics library creating problems, when including graphic library and cyber graphics at same time, they use different tags, so nothing really works.)

There is a workaround, allocating bitmap manually in fast memory, and blit it into Screen bitmap, you need to careful when initializing, telling the system its not a displayable bitmap. As displayable bitmap can be moved in and out of Graphic card memory, this why we need bitmap lock functions.
(32bit RGB is stored in the bitplane 0 pointer, if I'm not mistaken.)

the alternative is if you use the API’s you have available. And that’s the PEN functions. You need allocate a PEN, you change PEN color as you draw, the other pixels will not be affected. Of course, this will be slow.

that’s until AmigaOS3.x gets the same functions, we most likely have edit wars, where something changes because it has not the same name, its renamed, or because incompatibilities. I see your part of the “Amiga Developer Team", so you should know about this already.

There are most likely a bunch of flags you can’t use in the tag lists.

If you want to write compatible software, and not get lots of complaints, there is lots to think about, because it’s really is lot that is changed. (With open source everyone can make their own changes, if its none profit.)

But build system, can get complicated, but it all depends on what you’re making, and who it’s for. It should be stated clearly in the readme. And release notes.

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@NutsAboutAmiga

Why are you continuing to blather on about an unrelated target ?

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