I need help with my intro... I´m learning...

25 September 2014, 12:20

Hello friends ...

I am learning to program DEMOS-INTROS-CRACKTROS and need help with a SOURCE ..

The problem is I can not find where is the error in my code, is a basic INTRO, with LOGO, STARFIELD, PLAY-ROUTINE and SCROLL ... The logo is displayed but not the SCROLL, the lower half of the screen it is black ...

Include working discs, one containing the CED MASTERDEVPAC and ... on the other (SOURCES) is my INTRO file called "example.s" ...

I use WinUAE with images .ADF so appreciate that help me modify the code and point out the mistakes to learn from them ...

I also wish someone would give me SOURCES in .ADF format with routines of PIC + SCROLL, effects and small intros to learn to use the COPPER and BLITTER...

PS: I know THE LEGACY, FLASHTRO .. I prefer SOURCES of people here, routines to learn ...

Thank you.

StingRay · 25 September 2014, 12:46

I have told you already what you need to do and where to look. Coding an intro involves work from your side and not just asking someone else to fix the source for you. That's not learning.

25 September 2014, 14:23

I do not know you ... But thanks for commenting ... I understand that it takes work but no one can overcome obstacles without a little help ...

Leffmann · 25 September 2014, 19:03

If you can explain more clearly exactly what you're doing, what results you're getting and what results you were expecting, then people can probably help you faster. Nobody wants to debug the source code of a whole demo.

Also, don't post your source code in an ADF image

If you can narrow the problem down to a smaller amount of code, then de-tab the code and post it using

[CODE] [/CODE]

tags instead.

StingRay · 25 September 2014, 19:23

Quote:

Originally Posted by Skillion76

I do not know you ... But thanks for commenting ... I understand that it takes work but no one can overcome obstacles without a little help ...

You do know me, guess who fixed the source for you when you asked in the Amiga code facebook group.

Please do not think that "learning" is just asking other people to do the work for you. You won't learn much then.

And please don't call it "your" code as 99% of the code was done by someone else.

25 September 2014, 23:34

Excuse me, but did not know him by that name ... You are right, Startup routine is not mine, although I have no knowledge to create your own, but I'm not interested in anyone else to do my work, I only intend to learn from the little information I have, not fluent in English language, as there is no information or books in my language, I hope that it has not bothered by my comments ... I just want to learn a little more about my hobby not mean to offend anyone I guess ... you also would look when he began the work of others to learn ... not born knowing ...

Thank you all for the comments ... I'll study on my own to improve in the future ... I hope no one is upset ... A big hug.

phx · 26 September 2014, 14:42

There are several problems in the scroller code.

The logo seems to be at least 150 lines high, but for some reason you work with a single-plane buffer of 290 lines, although there may be only 100 left for the scroll text.

Code:

Picture                 DCB.B (290*46),0

The BPL1PT initialization for the scroller has two problems:

Code:

        MOVE.L   #Planes,A0                     Bpl OF SCROLL...?
        MOVE.L   #Picture,D0                    Picture Block
        MOVE.L   D0,Offset                      Save Screen Start Address
        ADD.L    #(200*46)-1,Offset             ;Pointer for Scroller POSICION
PlLp    MOVE.W   D0,6(A0)                       Load Low Word
        SWAP     D0                             Swap Words
        MOVE.W   D0,2(A0)                       Load High Word

1. An offset of 200 lines will be far below the bottom screen border. You won't see any manipulation there.
2. -1 is bad, as graphics pointers always have to be word-aligned.

The Blitter is used in Scroller to copy a region of 16 lines 4 pixels to the left. This is done by setting the destination one word left of the source and using a shift of 12. But it needs the descending mode of the Blitter, which you don't enable here in BLTCON1:

Code:

Scroller
        BTST    #$0A,$DFF016                    Test Right Mouse
        BNE.S   Nxt                             If Not Equal Carry on
        RTS                                     Else Pause!
Nxt     MOVE.L  #$C9F00000,$DFF040              A=D,12 bits Shift
        MOVE.L  #$00000000,$DFF064              Mod
        MOVE.L  #$FFFFFFFF,$DFF044              Masks
        MOVE.L  Offset,$DFF050                  Source
        MOVE.L  Offset,A1         
        SUBQ.L  #1,A1                           Subtract 16 Pxls
        MOVE.L  A1,$DFF054                      Destination
        MOVE.W  #23+64*16,$DFF058               BLTSIZE

The next bug is subtracting 1. One word left would be two bytes.

Also some problems when blitting the next character:

Code:

Blit    MOVE.W  #$09F0,$DFF040                  A = D Miniterm
        MOVE.L  Offset,A1                       Scroller pos on screen
        MOVE.L  #Font,A0                        Font
        ADD.L   D0,A0                           Add CharPos
        MOVE.L  A0,$DFF050                      A
        ADD.L   #44,A1                          Display in Modulo border
        MOVE.L  A1,$DFF054                      D

Assuming you would correctly enable the descending mode while scrolling you have to switch to ascending mode here again.
The character will appear at Offset, which is the last word in the last line of the scroller region. You better blit it to the last word of the first line.

Hewitson · 27 September 2014, 04:36

This is the problem with copying and pasting pieces of code together. Using examples is great, but instead of copying them, use them as a reference and make sure you actually understand what they're doing.

27 September 2014, 10:03

That I do friend, to understand the operation ... The sources there in magazines are public, for use in learning mode, I think anyone is free to cut and paste ... It's a way of learning, with examples of other ... Here it seems that everyone is an expert and no one has ever looked at an example to learn ...

27 September 2014, 10:06

Thanks phx ...

It is good to share knowledge and help each other without tossed in face or accuse others ...
I will review and revise your tips to debug the code, so I can learn ... That in the future to make my own STARTUPS ...

Lonewolf10 · 27 September 2014, 17:36

Quote:

Originally Posted by Skillion76

Here it seems that everyone is an expert and no one has ever looked at an example to learn ...

Not everyone here is an expert. I have spent the last 5 or so years learning and improving my ASM skills, with help from the members here.

I suggest you take a look at some of the threads in the Tutorials sub-forum here: http://eab.abime.net/forumdisplay.php?f=73

I have learnt alot from those threads.

25 September 2014, 23:34	#6
Skillion76 Posts: n/a	Excuse me, but did not know him by that name ... You are right, Startup routine is not mine, although I have no knowledge to create your own, but I'm not interested in anyone else to do my work, I only intend to learn from the little information I have, not fluent in English language, as there is no information or books in my language, I hope that it has not bothered by my comments ... I just want to learn a little more about my hobby not mean to offend anyone I guess ... you also would look when he began the work of others to learn ... not born knowing ... Thank you all for the comments ... I'll study on my own to improve in the future ... I hope no one is upset ... A big hug. Last edited by TCD; 26 September 2014 at 10:08. Reason: Back-to-back posts merged.

26 September 2014, 14:42	#7
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,519	There are several problems in the scroller code. The logo seems to be at least 150 lines high, but for some reason you work with a single-plane buffer of 290 lines, although there may be only 100 left for the scroll text. Code: Picture DCB.B (29046),0 The BPL1PT initialization for the scroller has two problems: Code: MOVE.L #Planes,A0 Bpl OF SCROLL...? MOVE.L #Picture,D0 Picture Block MOVE.L D0,Offset Save Screen Start Address ADD.L #(20046)-1,Offset ;Pointer for Scroller POSICION PlLp MOVE.W D0,6(A0) Load Low Word SWAP D0 Swap Words MOVE.W D0,2(A0) Load High Word 1. An offset of 200 lines will be far below the bottom screen border. You won't see any manipulation there. 2. -1 is bad, as graphics pointers always have to be word-aligned. The Blitter is used in Scroller to copy a region of 16 lines 4 pixels to the left. This is done by setting the destination one word left of the source and using a shift of 12. But it needs the descending mode of the Blitter, which you don't enable here in BLTCON1: Code: Scroller BTST #$0A,$DFF016 Test Right Mouse BNE.S Nxt If Not Equal Carry on RTS Else Pause! Nxt MOVE.L #$C9F00000,$DFF040 A=D,12 bits Shift MOVE.L #$00000000,$DFF064 Mod MOVE.L #$FFFFFFFF,$DFF044 Masks MOVE.L Offset,$DFF050 Source MOVE.L Offset,A1 SUBQ.L #1,A1 Subtract 16 Pxls MOVE.L A1,$DFF054 Destination MOVE.W #23+64*16,$DFF058 BLTSIZE The next bug is subtracting 1. One word left would be two bytes. Also some problems when blitting the next character: Code: Blit MOVE.W #$09F0,$DFF040 A = D Miniterm MOVE.L Offset,A1 Scroller pos on screen MOVE.L #Font,A0 Font ADD.L D0,A0 Add CharPos MOVE.L A0,$DFF050 A ADD.L #44,A1 Display in Modulo border MOVE.L A1,$DFF054 D Assuming you would correctly enable the descending mode while scrolling you have to switch to ascending mode here again. The character will appear at Offset, which is the last word in the last line of the scroller region. You better blit it to the last word of the first line.

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25 September 2014, 12:20	#1
Skillion76 Posts: n/a	I need help with my intro... I´m learning... Hello friends ... I am learning to program DEMOS-INTROS-CRACKTROS and need help with a SOURCE .. The problem is I can not find where is the error in my code, is a basic INTRO, with LOGO, STARFIELD, PLAY-ROUTINE and SCROLL ... The logo is displayed but not the SCROLL, the lower half of the screen it is black ... Include working discs, one containing the CED MASTERDEVPAC and ... on the other (SOURCES) is my INTRO file called "example.s" ... I use WinUAE with images .ADF so appreciate that help me modify the code and point out the mistakes to learn from them ... I also wish someone would give me SOURCES in .ADF format with routines of PIC + SCROLL, effects and small intros to learn to use the COPPER and BLITTER... PS: I know THE LEGACY, FLASHTRO .. I prefer SOURCES of people here, routines to learn ... Thank you. Last edited by Skillion76; 05 October 2014 at 20:21.

25 September 2014, 12:46	#2
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	I have told you already what you need to do and where to look. Coding an intro involves work from your side and not just asking someone else to fix the source for you. That's not learning.

25 September 2014, 14:23	#3
Skillion76 Posts: n/a	I do not know you ... But thanks for commenting ... I understand that it takes work but no one can overcome obstacles without a little help ...

25 September 2014, 19:03	#4
Leffmann Join Date: Jul 2008 Location: Sweden Posts: 2,269	If you can explain more clearly exactly what you're doing, what results you're getting and what results you were expecting, then people can probably help you faster. Nobody wants to debug the source code of a whole demo. Also, don't post your source code in an ADF image If you can narrow the problem down to a smaller amount of code, then de-tab the code and post it using [CODE] [/CODE] tags instead.

27 September 2014, 04:36	#8
Hewitson Registered User Join Date: Feb 2007 Location: Melbourne, Australia Age: 41 Posts: 3,773	This is the problem with copying and pasting pieces of code together. Using examples is great, but instead of copying them, use them as a reference and make sure you actually understand what they're doing.

27 September 2014, 10:03	#9
Skillion76 Posts: n/a	That I do friend, to understand the operation ... The sources there in magazines are public, for use in learning mode, I think anyone is free to cut and paste ... It's a way of learning, with examples of other ... Here it seems that everyone is an expert and no one has ever looked at an example to learn ...

27 September 2014, 10:06	#10
Skillion76 Posts: n/a	Thanks phx ... It is good to share knowledge and help each other without tossed in face or accuse others ... I will review and revise your tips to debug the code, so I can learn ... That in the future to make my own STARTUPS ...

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