Hardware1?

[SMcNeill]

Quick question:  How do we access the 2nd hardware screen again?  _DISPLAYORDER tells us we have 2 hardware screens, and I remember using the in the past, but I don't recall the syntax now.

_COPYIMAGE(image,34)??

[Gets]

Set the destination for a hardware image to 1 and it will be displayed on that screen, I think. I don't remember anything else

[Petr]

_DISPLAYORDER _HARDWARE
or
_DISPLAYORDER _HARDWARE1

it is what you meant?

[SMcNeill]

_DISPLAYORDER _HARDWARE
or
_DISPLAYORDER _HARDWARE1

it is what you meant?

Not quite.   

QB64 has 2 different hardware screens which we can put images on to layer them, as well as the software screen and the one for OpenGL generated images.  Imagine 4 drawings -- a circle, triangle, square, and scribbles...  With each one on a different screen, we can use _DISPLAYORDER to set them to layer however we want.  The square might draw over the circle, but be under the triangle, with the scribbles on top of them all...

We just draw to put stuff on the software screen.   LINE, PSET, CIRCLE, ect...
We use GL commands in _SUBGL to put stuff on the GL-screen.
We use _COPYIMAGE(image,33) or _NEWIMAGE(x,y,33) to put stuff on the HARDWARE screen.

But what's the syntax to put stuff on that second hardware screen?  _HARDWARE1?

What simple step am I forgetting to designate the difference in which one I want to draw/copy to?

[TerryRitchie]

Well this is interesting. Something I missed in the _DISPLAYORDER wiki entry and never even knew about.

Does anyone have code to show how to take advantage of the second hardware screen?

[SMcNeill]

Well this is interesting. Something I missed in the _DISPLAYORDER wiki entry and never even knew about.

Does anyone have code to show how to take advantage of the second hardware screen?

I do...

On the [abandoned, outdated and now likely malicious qb64 dot net website - don’t go there] forums, where I did a demo on _DISPLAYORDER in the past. 

Problem is, I can't quite remember how it worked now.  I was thinking it was just a simple difference of using 33 or 34 to designate the two screens, but I was having issues with that last night when I tried it.  I may have to dig into the source some to see how to properly use the second hardware screen again.

[FellippeHeitor]

There's no mode 34, that's for certain.

By looking at the code, (in internal/c/libqb/gui.cpp) it seems like _HARDWARE and _HARDWARE1 are the same layer that can be overlaid twice, so that you could have _HARDWARE, _SOFTWARE, _HARDWARE1 and then have a hardware surface sandwich filled with a software screen or _GL screen.

To be confirmed, but it really seems so from what I've found.

[TerryRitchie]

I was snooping around in that file too and noticed something. I'm not a C++ programmer first of all, so I could be totally incorrect on this.

However, it appears the 'else' statement on line 214 has no associated closing brace.

On line 225 another 'if' statement starts with an opening brace.

The section appears to have something to do with stretching a letter box view and square pixels.

Edit: maybe the closing brace on line 244 is the one I'm missing? The indenting is a bit strange.

Never mind - Notepad++ was closing some of them. Line 244 is the associated brace.

[Petr]

Try this way

press spacebar for layers selecting

Code: QB64: [Select]

1.  
2. 'four layers: software, hardware, GL, hardware2
3.  
4.  
5. soft& = _NEWIMAGE(320, 240, 32)
6. hard& = _NEWIMAGE(320, 240, 32)
7. hard2& = _NEWIMAGE(320, 240, 32)
8.  
9.  
10. SCREEN _NEWIMAGE(800, 600, 32)
11.  
12. _DEST soft&
13. CIRCLE (160, 120), 90, _RGB32(255, 255, 255)
14.  
15. _DEST hard&
16. LINE (20, 20)-(300, 220), _RGB32(0, 0, 255), BF
17. hardw& = _COPYIMAGE(hard&, 33)
18. _FREEIMAGE hard&
19.  
20. _DEST hard2&
21. LINE (0, 0)-(319, 239), _RGB32(255, 255, 255), BF
22. hardw2& = _COPYIMAGE(hard2&, 33)
23. _FREEIMAGE hard2&
24.  
25.  
26.  
27. DO WHILE I$ <> CHR$(27)
28.     I$ = INKEY$
29.     IF I$ = CHR$(32) THEN selec = selec + 1: IF selec > 3 THEN selec = 0
30.     SELECT CASE selec
31.         CASE 0
32.             _DISPLAYORDER _GLRENDER
33.  
34.         CASE 1
35.             _DISPLAYORDER _HARDWARE , _HARDWARE1
36.             _PUTIMAGE (0, 0), hardw&
37.  
38.         CASE 2
39.             _DISPLAYORDER _HARDWARE1 , _HARDWARE
40.             _PUTIMAGE (0, 0), hardw2&
41.  
42.  
43.         CASE 3
44.             _DISPLAYORDER _SOFTWARE , _HARDWARE , _HARDWARE1
45.             CLS
46.             PRINT "software", soft&
47.             _PUTIMAGE , soft&
48.  
49.  
50.  
51.  
52.     END SELECT
53.  
54.  
55.     _DISPLAY 'NEED FOR HARDWARE!!!!
56. LOOP
57.  
58.  
59.  
60.  
61.  
62.  
63.  
64.  
65. SUB _GL
66.  
67.     'for opengl
68.  
69.     ' GLubyte bitmap[24]={                      //bitmap size 10 x 12 pixels
70.     DIM bitmap(24) AS _UNSIGNED _BYTE
71.     RESTORE value
72.     '--------------------------------- Glubyte QB64 method --------------------------------
73.     FOR LoadArray = 0 TO 23
74.         READ value$
75.         hexadecimal$ = "&H" + RIGHT$(value$, 2)
76.         bitmap(LoadArray) = VAL(hexadecimal$)
77.     NEXT
78.     value:
79.     DATA 0xc0,0x00,0xc0,0x00,0xc0,0x00,0xc0,0x00 '// begin is in left down corner              SEE TO LINE 47 HOW TO WRITE CORRECTLY THIS ARRAY FOR USE WITH _OFFSET!!!! (last parameter for _glBitmap)
80.     DATA 0xc0,0x00,0xff,0x00,0xff,0x00,0xc0,0x00
81.     DATA 0xc0,0x00,0xc0,0x00,0xff,0xc0,0xff,0xc0
82.     '--------------------------------- Glubyte end -----------------------------------------
83.  
84.  
85.  
86.     _glPixelStorei _GL_UNPACK_ALIGNMENT, 1 '      // every pixel sort to bytes
87.     _glClearColor 0.0F, 0.0F, 0.0F, 0.0F '       // background color
88.  
89.  
90.  
91.  
92.  
93.     _glViewport 0, 0, _DESKTOPWIDTH, _DESKTOPHEIGHT '                    // you see complete window
94.     _glMatrixMode _GL_PROJECTION '               // modification matrix begin
95.     _glLoadIdentity '                          //  clear matrix (create identity)
96.     _glOrtho 0, _DESKTOPWIDTH, 0, _DESKTOPHEIGHT, -1, 1 '
97.  
98.  
99.     _glClear _GL_COLOR_BUFFER_BIT '              // clear all colors in color buffer
100.  
101.     _glBegin _GL_TRIANGLES '                      // draw RGB triangle in background
102.     _glColor3f 1.0F, 0.0F, 0.0F
103.     _glVertex2i 0, 0
104.     _glColor3f 0.0F, 1.0F, 0.0F
105.     _glVertex2i 400, 0
106.     _glColor3f 0.0F, 0.0F, 1.0F
107.     _glVertex2i 200, 300
108.     _glEnd
109.  
110.     _glColor3f 1.0F, 1.0F, 1.0F '                // white color for first bitmap
111.     _glRasterPos2i 200, 200 '                    // position for first bitmap
112.     _glBitmap 10, 12, 0.0F, 0.0F, 0.0F, 0.0F, _OFFSET(bitmap()) '// draw bitmap
113.  
114.     _glColor3f 0.0F, 0.0F, 0.5F '                // darkblue color for second bitmap
115.     _glRasterPos2i 50, 10 '                      // position for second bitmap
116.     _glBitmap 10, 12, 0.0F, 0.0F, 0.0F, 0.0F, _OFFSET(bitmap()) ' draw second bitmap
117.  
118.     _glRasterPos2i 350, 10 '                     // ATTENTION, here is color set after glRasterPos2i(),
119.     _glColor3f 0.5F, 0.0F, 0.0F '                // also color for next bitmap is the same as in previous case
120.     _glBitmap 10, 12, 0.0F, 0.0F, 0.0F, 0.0F, _OFFSET(bitmap()) ' vykresleni bitmapy
121.  
122.     _glFlush '                                  // create and draw all to screen
123.  
124. END SUB
125.  
126.