Lua Programming Help Thread

Zitat:

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Zitat von Mistabeen

Could someone take a look at this code, for some reason I get in my Debug (working with LuaDevKit)
Exit Value: 1
usage: luaplayer script.lua

If I open another script it opens just fine, so I guess I must be not seeing something that is probably so obvious :p

Spoiler for Lua code:

-- colors --
red= Color.new(255,0,0)
green= Color.new(0,255,0)
white= Color.new(255,255,255)
yellow= Color.new(255,226,40)

-- Timer --
counter = Timer.new()
counter:start()

-- images --
bighit= Image.load("bighit.png")

-- music table --
notes={}
notes[1]={time=5000,note=1}
notes[2]={time=7000,note=1}
notes[3]={time=10000,note=1}
notes[4]={time=12000,note=1}

-- vars --
oldpad = Controls.read()

-- Main loop --
while true do
pad = Controls.read()
screen:clear()
currentTime = counter:time()

screen:blit(50,50,bighit)


screen.waitVblankStart()
oldpad=pad
screen.flip()
end

-= Double Post =-
I eventualy found what was wrong, for some reason my filename was to big :p kinda silly

I've got another problem tho
is there any decent soundsupport for LUA? or is there a way to preload my musicfiles, or is there a way to reset my timer as soon as the music starts playing.
Right now I had to use wav for my music (.xm file was the worst thing ever) and that plays, only problem is there is a delay and I need my music to be in perfect sync with my timer.

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timer:reset(0)

Zitat:

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Zitat von myschoo

timer:reset(0)

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that is not what I meanth, I startplaying my music, but there is a small delay on the music, LUA player has to load the file first
so I would like mt counter to reset the exact moment you hear thre sound

You can't as once you call music.playFile() it loads and plays, you can't inject your own timer:start() code after the load sequence.

The best you can do is guess via trial and error when the music starts playing (500 miliseconds after calling music.playfile, etc.)

First I was looking on how to get started, but I am done with that part and have done the Hello world script.lua already, and all of the lessons on evilmana.com, and am now trying to do a overall goal of creating a game called RODM or Run or Die, Mouse based on a flash game called Bat and Mouse, but I am running into problems. Go to page 7 or later for my latest problems

Most basic tutorials for C and LUA here:
http://www.psp-programming.com/tutorials/
Some more advanced here:
http://www.psp-programming.com/forum...uncements;id=1

No good C++ guides on the internet? Nice joke. Link.

Zitat:

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Zitat von Art

Most basic tutorials for C and LUA here:
http://www.psp-programming.com/tutorials/
Some more advanced here:
http://www.psp-programming.com/forum...uncements;id=1

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thanks i'll start from there

Zitat:

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Zitat von _dysfunctional

No good C++ guides on the internet? Nice joke. Link.

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and the first link will help me code for psp and use a compiler for psp right? no. I seriously doubt it. Anyways the link above from Art shows BOTH C and lua even though C++ and C arn't the same thing, but I'm pretty sure they're similar. I'll start in lua so I don't need to compile :P

Ok I am just starting and all, my Hello World worked, but is there like a flash application of some sort that lets me click on a color and it will show me the RGB? (0, 0, 255 for blue, for example) because I know there is one in photoshop but that makes my computer lag like hell

EDIT: NVRM what i'm using is microsoft paint - go to colors at the top, click on edit colors, click on define custom colors, and a full RGB table will come up and if you click anywhere it shows you what the RGB values are for that color WHOOHOO yay

Zitat:

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Now we are going to flip the screen again, set the volume, and wait on the screen until the sound is finished. Put this in your code:
screen.waitVblankStart(24 0)
Music.volume(128)
As we touched on before, there are sixty Vblanks in a second, so we are pausing the program for four seconds (240/60 = 4). "screen.flip()" just updates the screen. And, Music.volume(128) sets the volume to 128; this is the highest that the volume goes (0 is the lowest). Now our loading screen (and our intro) are done! Hooray! Give your self a big hug. (Aside: whitehawk is a little weird for adding that in, but hey who am I, the editor, to judge?)

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Ok the bold, italisized, underlined part above is where I am confused. Here is a copy/paste of what I have done so far

Code:

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System.usbDiskModeActivate()
pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(150, 150, 150)
black = Color.new(0 , 0 , 0)
screen:print(194, 136, "Loading: 0%", pink)
screen.flip()
background = Image.load("images/background.jpg")
screen:clear()
screen:print(194, 136, "Loading: 20%", pink)
screen.flip()
circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 40%", pink)
screen.flip()

l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 60%", pink)
screen.flip()

r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
boltsnd = Sound.load("music/comp.wav")

screen:clear()
screen:print(194, 136, "Loading: 80%", pink)
screen.flip()

square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")

screen:clear()
screen:print(194, 136, "Loading: 90%", pink)
screen.flip()

up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.png")

screen:clear()
screen:print(194, 136, "Loading: 99%", pink)
screen.flip()

screen.waitVblankStart(240)
Music.volume(128)

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Now those last two lines were copied from the quote, but he says that we are going to do screen.flip again, so I was thinking if I should make it look like this

screen.flip()
screen.waitVblankStart(24 0)
Music.volume(128)

but then again, that would do a double screen clear which would be pointless to put the same line twice, so should I put it after the screen.waitVblankStart(24 0) and before the music volume? or should I ignore that completely?

EDIT: it is now 3:00 am WHERE I LIVE so I'll go to bed and see if I can get an answer tomorrow. hopefully someone will help me so i can become a good coder in the future. I am not going to post any half-witted lua releases when I learn to code, instead, i am going to see if there are any good ideas, and if there arn't any, then I will switch to C, which I will have a basic understanding of programming applications altogether so learning C will make more sense, or i can try to completely master lua and come up with something three-quarters-witted instead of half-witted (i havn't seen any good lua applicaitons or games at all so i can't expect me to break the barrier of lua vs. C)

Zitat:

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Zitat von psDevWiki

width, height Font:getTextSize(string)

Returns the width and height, which will be used, if the specified text is drawn with this font and the current font size.

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would this be valid?

Code:

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wpt,hpt = proportional:getTextSize(title)

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i need the width of the text in title when printed with the proportional font.
-= Double Post =-
oh and a bit more detail if anyone cant follow what i'm doing:

Code:

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--center and print text
proportional = Font.createProportional()
proportional:setPixelSizes(0, 10)
wpt,hpt = proportional:getTextSize(title)
icon92:fontPrint(proportional, 45-(wpt/2), 64, title)

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Zitat:

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Zitat von Gam3freQ

and the first link will help me code for psp

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Yes.

Zitat:

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Zitat von yaustar

Yes.

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K then, fine, I'll start with lua first though just to get the hang of it, please read my above post and help me

when he says again i think he means because you have done it several times already

Zitat:

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Zitat von slicer4ever

when he says again i think he means because you have done it several times already

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That's correct but if you look in my code there is a flip right above the last two lines, and he says again so he wants it to be there two lines in a row? i guess not I will just leave it as it is so that I can see if it can be read properly now.

Zitat:

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The first thing we're going to do is start our game loop and display the background.
while true do
screen:blit(0, 0, background, false)
Remember from the first tutorial when we used the infinite loop at the end? Well, this uses the same concept, except we are going to do the main bulk of our program until the user exits the script rather than just pausing. The other line (obviously, since this is about the gagillionth time we've done this) writes the image into the offscreen buffer.

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I thought you do screen.flip() to write to the onscreen buffer? why are there all of those spaces before the screen:blit(0, 0, background, false) ?

Since it says 0, 0, background, false does that mean that the background goes from onscreen to offscreen and becomes false while it is true? :sigh: not getting anywhere

Please someone tell me about the spaces. in the tutorial it says nothing about them. see look they are here too ( to the left of screen:print and screen.flip - does that mean to assosicate with the control.pad?)

Code:

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          screen:print(135, 251, "Press 'Start' to restart", blue)
          screen:print(110, 261, "Press 'Select' for a screenshot", blue)
          screen:print(383, 35, "Support:", black)
          screen:print(365, 45, "PS3Lounge.net", orange)
          screen:print(365, 55, "scriptscribbler.com/psp", gray)
          screen.flip()

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everything is drawn behind the screen in order to show the stuff drawn u have to call screen.flip()

Google around the subject of double buffering.

Here is my 'go' at trying to explain it.

Most games are double buffered nowadays, this means they have a section of memory that holds the pixel data to display to the screen.

It is called double buffering because you have an 'on-screen' buffer which is the pixel data being displayed on the screen in a frame. There is also another buffer, the 'off-screen' buffer that also holds pixel data, it is 'off-screen' so you can edit that data (through blitting for example) without affecting the image currently on the screen.

When you flip the buffers, the on-screen buffer now becomes the off-screen buffer and the off-screen buffer becomes the on-screen one which is then displayed on screen.

The reason why we wait for the Vblank ( read this ) to start before flipping buffers is because this is when the horizontal scanline of your display finishes rendering what you can see on the screen. This is the point when you can flip the buffers without affecting what the screen is currently trying to display.

If you don't what for the Vblank, you will tearing or shearing in the display because you have changed the data that the screen is reading from which holds a slightly different image.

Zitat:

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Zitat von yaustar

Google around the subject of double buffering.

Here is my 'go' at trying to explain it.

Most games are double buffered nowadays, this means they have a section of memory that holds the pixel data to display to the screen.

It is called double buffering because you have an 'on-screen' buffer which is the pixel data being displayed on the screen in a frame. There is also another buffer, the 'off-screen' buffer that also holds pixel data, it is 'off-screen' so you can edit that data (through blitting for example) without affecting the image currently on the screen.

When you flip the buffers, the on-screen buffer now becomes the off-screen buffer and the off-screen buffer becomes the on-screen one which is then displayed on screen.

The reason why we wait for the Vblank ( read this ) to start before flipping buffers is because this is when the horizontal scanline of your display finishes rendering what you can see on the screen. This is the point when you can flip the buffers without affecting what the screen is currently trying to display.

If you don't what for the Vblank, you will tearing or shearing in the display because you have changed the data that the screen is reading from which holds a slightly different image.

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thanks, well, i finally finished my code, i went to try it on my PSP, and it says error at line 53 expect end or something like that I am gonna paste my entire code here now

Code:

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1. System.usbDiskModeActivate()
2. pink = Color.new(255, 0 , 153)
3. blue = Color.new(0 , 153, 255)
4. orange = Color.new(255, 102, 0)
5. gray = Color.new(150, 150, 150)
6. black = Color.new(0 , 0 , 0)
7. screen:print(194, 136, "Loading: 0%", pink)
8. screen.flip()
9. background = Image.load("images/background.jpg")
10. screen:clear()
11. screen:print(194, 136, "Loading: 20%", pink)
12. screen.flip()
13. circle = Image.load("images/buttons/circle_button.png")
14. down = Image.load("images/buttons/down_arrow.png")
15. screen:clear()
16. screen:print(194, 136, "Loading: 40%", pink)
17. screen.flip()
18. l = Image.load("images/buttons/left_trigger.png")
19. left = Image.load("images/buttons/left_arrow.png")
20. screen:clear()
21. screen:print(194, 136, "Loading: 60%", pink)
22. screen.flip()
23. r = Image.load("images/buttons/right_trigger.png")
24. right = Image.load("images/buttons/right_arrow.png")
25. boltsnd = Sound.load("music/comp.wav")
26. screen:clear()
27. screen:print(194, 136, "Loading: 80%", pink)
28. screen.flip()
29. square = Image.load("images/buttons/square_button.png")
30. triangle = Image.load("images/buttons/triangle_button.png")
31. screen:clear()
32. screen:print(194, 136, "Loading: 90%", pink)
33. screen.flip()
34. up = Image.load("images/buttons/up_arrow.png")
35. x = Image.load("images/buttons/cross_button.png")
36. splash = Image.load("images/lua.png")
37. screen:clear()
38. screen:print(194, 136, "Loading: 99%", pink)
39. screen.flip()
40. screen.waitVblankStart(240)
41. Music.volume(128)
42. while true do
43.           screen:blit(0, 0, background, false)
44. pad = Controls.read()
45.           screen:print(135, 251, "Press 'Start' to restart", blue)
46.           screen:print(110, 261, "Press 'Select' for a screenshot", blue)
47.           screen:print(383, 35, "Support:", black)
48.           screen:print(365, 45, "PS3Lounge.net", orange)
49.           screen:print(365, 55, "scriptscribbler.com/psp", gray)
50.           screen.flip()
51.           if pad:cross() then
52.                     screen:blit(50, 228, x)
53.                     screen.flip()
54.           end
55.           if pad:circle() then
56.                     screen:blit(90, 195, circle)
57.                     screen.flip()
58.           end
59.           if pad:triangle() then
60.                     screen:blit(45, 165, triangle)
61.                     screen.flip()
62.           end
63.           if pad:square() then
64.                     screen:blit(15, 195, square)
65.                     screen.flip()
66.           end
67.           if pad:up() then
68.                     screen:blit(60, 40, up)
69.                     screen.flip()
70.           end
71.           if pad:right() then
72.                     screen:blit(90, 65, right)
73.                     screen.flip()
74.           end
75.           if pad:down() then
76.                     screen:blit(60, 80, down)
77.                     screen.flip()
78.           end
79.           if pad:left() then
80.                     screen:blit(30, 65, left)
81.                     screen.flip()
82.           end
83.           if pad:l() then
84.                     screen:blit(4, 6, l)
85.                     screen.flip()
86.           end
87.           if pad:r() then
88.                     screen:blit(403, 4, r)
89.                     screen.flip()
90.           end
91.           if pad:select() then screen:save("screenshot.tga") end
92.           if pad:start() then
93.                     break
94.           end

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I numbered them just for the forum
as you can see, there is an end at line 54 so I don't see a problem
here is the code without listing: (bold line 54)

Spoiler for full code:

Code:

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System.usbDiskModeActivate()
pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(150, 150, 150)
black = Color.new(0 , 0 , 0)
screen:print(194, 136, "Loading: 0%", pink)
screen.flip()
background = Image.load("images/background.jpg")
screen:clear()
screen:print(194, 136, "Loading: 20%", pink)
screen.flip()
circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 40%", pink)
screen.flip()

l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 60%", pink)
screen.flip()

r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
boltsnd = Sound.load("music/comp.wav")

screen:clear()
screen:print(194, 136, "Loading: 80%", pink)
screen.flip()

square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")

screen:clear()
screen:print(194, 136, "Loading: 90%", pink)
screen.flip()

up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.png")

screen:clear()
screen:print(194, 136, "Loading: 99%", pink)
screen.flip()

screen.waitVblankStart(240)
Music.volume(128)

while true do
          screen:blit(0, 0, background, false)

pad = Controls.read()

          screen:print(135, 251, "Press 'Start' to restart", blue)
          screen:print(110, 261, "Press 'Select' for a screenshot", blue)
          screen:print(383, 35, "Support:", black)
          screen:print(365, 45, "PS3Lounge.net", orange)
          screen:print(365, 55, "scriptscribbler.com/psp", gray)
          screen.flip()

          if pad:cross() then
                    screen:blit(50, 228, x)
                    screen.flip()
          end

          if pad:circle() then
                    screen:blit(90, 195, circle)
                    screen.flip()
          end

          if pad:triangle() then
                    screen:blit(45, 165, triangle)
                    screen.flip()
          end

          if pad:square() then
                    screen:blit(15, 195, square)
                    screen.flip()
          end

          if pad:up() then
                    screen:blit(60, 40, up)
                    screen.flip()
          end

          if pad:right() then
                    screen:blit(90, 65, right)
                    screen.flip()
          end

          if pad:down() then
                    screen:blit(60, 80, down)
                    screen.flip()
          end

          if pad:left() then
                    screen:blit(30, 65, left)
                    screen.flip()
          end

          if pad:l() then
                    screen:blit(4, 6, l)
                    screen.flip()
          end

          if pad:r() then
                    screen:blit(403, 4, r)
                    screen.flip()
          end

          if pad:select() then screen:save("screenshot.tga") end
          if pad:start() then
                    break
          end

---

As for the spaces issue:
http://c2.com/cgi/wiki?CodeFormatting
And more specifically: http://c2.com/cgi/wiki?WhitespaceIsGood
-= Double Post =-
This is WHY you properly format code, with it properly formatted the error is obvious:

Code:

---

System.usbDiskModeActivate()

pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(150, 150, 150)
black = Color.new(0 , 0 , 0)

screen:print(194, 136, "Loading: 0%", pink)
screen.flip()
background = Image.load("images/background.jpg")
screen:clear()

screen:print(194, 136, "Loading: 20%", pink)
screen.flip()
circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")
screen:clear()

screen:print(194, 136, "Loading: 40%", pink)
screen.flip()
l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")
screen:clear()

screen:print(194, 136, "Loading: 60%", pink)
screen.flip()
r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
boltsnd = Sound.load("music/comp.wav")
screen:clear()

screen:print(194, 136, "Loading: 80%", pink)
screen.flip()
square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")
screen:clear()

screen:print(194, 136, "Loading: 90%", pink)
screen.flip()
up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.png")
screen:clear()

screen:print(194, 136, "Loading: 99%", pink)
screen.flip()
screen.waitVblankStart(240)
Music.volume(128)

while true do
        screen:blit(0, 0, background, false)
        pad = Controls.read()
        screen:print(135, 251, "Press 'Start' to restart", blue)
        screen:print(110, 261, "Press 'Select' for a screenshot", blue)
        screen:print(383, 35, "Support:", black)
        screen:print(365, 45, "PS3Lounge.net", orange)
        screen:print(365, 55, "scriptscribbler.com/psp", gray)
        screen.flip()
       
        if pad:cross() then
                screen:blit(50, 228, x)
                screen.flip()
        end
       
        if pad:circle() then
                screen:blit(90, 195, circle)
                screen.flip()
        end
        if pad:triangle() then
                screen:blit(45, 165, triangle)
                screen.flip()
        end
       
        if pad:square() then
                screen:blit(15, 195, square)
                screen.flip()
        end
       
        if pad:up() then
                screen:blit(60, 40, up)
                screen.flip()
        end
       
        if pad:right() then
                screen:blit(90, 65, right)
                screen.flip()
        end
       
        if pad:down() then
                screen:blit(60, 80, down)
                screen.flip()
        end
       
        if pad:left() then
                screen:blit(30, 65, left)
                screen.flip()
        end
       
        if pad:l() then
                screen:blit(4, 6, l)
                screen.flip()
        end
       
        if pad:r() then
                screen:blit(403, 4, r)
                screen.flip()
        end
       
        if pad:select() then
                screen:save("screenshot.tga")
        end
       
        if pad:start() then
                break
        end

---

There are also a several common mistakes in there, why are you flipping buffers every time you press a button? Why are you not waiting for the Vbank to start before flipping buffers?

you forgot to end the while true do place an end at the very end of the script
-= Double Post =-
also i surgest takeing out all those sceen.flips and place just 1 right before you end the while true do

Zitat:

---

Zitat von yaustar

As for the spaces issue:
http://c2.com/cgi/wiki?CodeFormatting
And more specifically: http://c2.com/cgi/wiki?WhitespaceIsGood
-= Double Post =-
This is WHY you properly format code, with it properly formatted the error is obvious:

Code:

---

System.usbDiskModeActivate()

pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(150, 150, 150)
black = Color.new(0 , 0 , 0)

screen:print(194, 136, "Loading: 0%", pink)
screen.flip()
background = Image.load("images/background.jpg")
screen:clear()

screen:print(194, 136, "Loading: 20%", pink)
screen.flip()
circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")
screen:clear()

screen:print(194, 136, "Loading: 40%", pink)
screen.flip()
l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")
screen:clear()

screen:print(194, 136, "Loading: 60%", pink)
screen.flip()
r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
boltsnd = Sound.load("music/comp.wav")
screen:clear()

screen:print(194, 136, "Loading: 80%", pink)
screen.flip()
square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")
screen:clear()

screen:print(194, 136, "Loading: 90%", pink)
screen.flip()
up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.png")
screen:clear()

screen:print(194, 136, "Loading: 99%", pink)
screen.flip()
screen.waitVblankStart(240)
Music.volume(128)

while true do
        screen:blit(0, 0, background, false)
        pad = Controls.read()
        screen:print(135, 251, "Press 'Start' to restart", blue)
        screen:print(110, 261, "Press 'Select' for a screenshot", blue)
        screen:print(383, 35, "Support:", black)
        screen:print(365, 45, "PS3Lounge.net", orange)
        screen:print(365, 55, "scriptscribbler.com/psp", gray)
        screen.flip()
       
        if pad:cross() then
                screen:blit(50, 228, x)
                screen.flip()
        end
       
        if pad:circle() then
                screen:blit(90, 195, circle)
                screen.flip()
        end
        if pad:triangle() then
                screen:blit(45, 165, triangle)
                screen.flip()
        end
       
        if pad:square() then
                screen:blit(15, 195, square)
                screen.flip()
        end
       
        if pad:up() then
                screen:blit(60, 40, up)
                screen.flip()
        end
       
        if pad:right() then
                screen:blit(90, 65, right)
                screen.flip()
        end
       
        if pad:down() then
                screen:blit(60, 80, down)
                screen.flip()
        end
       
        if pad:left() then
                screen:blit(30, 65, left)
                screen.flip()
        end
       
        if pad:l() then
                screen:blit(4, 6, l)
                screen.flip()
        end
       
        if pad:r() then
                screen:blit(403, 4, r)
                screen.flip()
        end
       
        if pad:select() then
                screen:save("screenshot.tga")
        end
       
        if pad:start() then
                break
        end

---

There are also a several common mistakes in there, why are you flipping buffers every time you press a button? Why are you not waiting for the Vbank to start before flipping buffers?

---

Because It told me to do so here which is the guide I followed to make this, look on page 4 it says to do that. It didn't say to do a Vblank because then that would need a screen.wait()
-= Double Post =-

Zitat:

---

Zitat von slicer4ever

you forgot to end the while true do place an end at the very end of the script
-= Double Post =-
also i surgest takeing out all those sceen.flips and place just 1 right before you end the while true do

---

OH I SEE I FORGOT THE WHILE TRUE DO END THING! thanks will try give me one second to test - the screenflips were told to be done by the guide I was just following the guide and also just wondering but if I do screen.flip(1) will that put the screen upidedown?

EDIT: it works now yay - the screen flips are because when you let go of the button the screen has to clear so that it don't show all the buttons again

Zitat:

---

Because It told me to do so here which is the guide I followed to make this, look on page 4 it says to do that. It didn't say to do a Vblank because then that would need a screen.wait()

---

Didn't I just explain why and how we use them in my last post? Did you just ignore it?

screen.flip does not actually flip the screen upside down it only flips the unseen buffer to be seen

PSP-programming 's Lua tutorials are terrible. Use these instead:
http://wiki.ps2dev.org/psp:lua_player:tutorial
http://www.evilmana.com/tutorials/lua_tutorial_list.php

They are at least slightly better.

Zitat:

---

Zitat von yaustar

Didn't I just explain why and how we use them in my last post? Did you just ignore it?

---

no i didn't ignore it

Zitat:

---

Zitat von yaustar

There are also a several common mistakes in there, why are you flipping buffers every time you press a button? Why are you not waiting for the Vbank to start before flipping buffers?

---

Because As long as you hold the button the image will display, and when you let go the image dissapears. if the vbank starts then that means that when i let go it will still be displayed right?

Zitat:

---

Zitat von yaustar

PSP-programming 's Lua tutorials are terrible. Use these instead:
http://wiki.ps2dev.org/psp:lua_player:tutorial
http://www.evilmana.com/tutorials/lua_tutorial_list.php

They are at least slightly better.

---

WIll try now that I got my first button tester working!

Zitat:

---

Zitat von slicer4ever

screen.flip does not actually flip the screen upside down it only flips the unseen buffer to be seen

---

oh lol I was just wondering if I put a 1 in there if it would do that

EDIT: i do remember somewhere in that code I put it to play a sound, but i don't remember where and i don't hear the sound

NO as i said the screen.flip() well only flip the unseen to seen so calling them at diffrent points does u no good, just call one right before you end the while true do loop

This is how the while loop should look like:

Code:

---

while true do
        screen:blit(0, 0, background, false)
       
        pad = Controls.read()
       
        screen:print(135, 251, "Press 'Start' to restart", blue)
        screen:print(110, 261, "Press 'Select' for a screenshot", blue)
        screen:print(383, 35, "Support:", black)
        screen:print(365, 45, "PS3Lounge.net", orange)
        screen:print(365, 55, "scriptscribbler.com/psp", gray)
       
        if pad:cross() then
                screen:blit(50, 228, x)
        end
       
        if pad:circle() then
                screen:blit(90, 195, circle)
        end
        if pad:triangle() then
                screen:blit(45, 165, triangle)
        end
       
        if pad:square() then
                screen:blit(15, 195, square)
        end
       
        if pad:up() then
                screen:blit(60, 40, up)
        end
       
        if pad:right() then
                screen:blit(90, 65, right)
        end
       
        if pad:down() then
                screen:blit(60, 80, down)
        end
       
        if pad:left() then
                screen:blit(30, 65, left)
        end
       
        if pad:l() then
                screen:blit(4, 6, l)
        end
       
        if pad:r() then
                screen:blit(403, 4, r)
        end
       
        if pad:select() then
                screen:save("screenshot.tga")
        end
       
        if pad:start() then
                break
        end
       
        screen.waitVblankStart()
        screen.flip()
end

---

Zitat:

---

Zitat von yaustar

This is how the while loop should look like:

Code:

---

while true do
        screen:blit(0, 0, background, false)
       
        pad = Controls.read()
       
        screen:print(135, 251, "Press 'Start' to restart", blue)
        screen:print(110, 261, "Press 'Select' for a screenshot", blue)
        screen:print(383, 35, "Support:", black)
        screen:print(365, 45, "PS3Lounge.net", orange)
        screen:print(365, 55, "scriptscribbler.com/psp", gray)
       
        if pad:cross() then
                screen:blit(50, 228, x)
        end
       
        if pad:circle() then
                screen:blit(90, 195, circle)
        end
        if pad:triangle() then
                screen:blit(45, 165, triangle)
        end
       
        if pad:square() then
                screen:blit(15, 195, square)
        end
       
        if pad:up() then
                screen:blit(60, 40, up)
        end
       
        if pad:right() then
                screen:blit(90, 65, right)
        end
       
        if pad:down() then
                screen:blit(60, 80, down)
        end
       
        if pad:left() then
                screen:blit(30, 65, left)
        end
       
        if pad:l() then
                screen:blit(4, 6, l)
        end
       
        if pad:r() then
                screen:blit(403, 4, r)
        end
       
        if pad:select() then
                screen:save("screenshot.tga")
        end
       
        if pad:start() then
                break
        end
       
        screen.waitVblankStart()
        screen.flip()
end

---

---

whoa amazing I'll get on those tutorials you linked right away because apparently psp-programming sucks at this. the above seems to make alot more sense even though both work, so i will definately not do this

also u didn't put in the while loop to play sound u only loaded in sound

Zitat:

---

Zitat von yaustar

In that case what is a Vblank? If you read my post, you should be able to answer this correctly?

---

a vbank is 1 60th of a second because 60 vbanks is one second right? and i put it to stay on Loading 99% for 240 vbanks which is 4 seconds so that is what it is

Zitat:

---

Zitat von slicer4ever

also u didn't put in the while loop to play sound u only loaded in sound

---

The tutorial only showed how to play text and images not sounds it only said how to load the .wav files

Zitat:

---

Zitat von Gam3freQ

whoa amazing I'll get on those tutorials you linked right away because apparently psp-programming sucks at this. the above seems to make alot more sense even though both work, so i will definately not do this

---

The AI tutorial is fine, it was written by someone who knows what he/she is talking about.
-= Double Post =-

Zitat:

---

Zitat von Gam3freQ

a vbank is 1 60th of a second because 60 vbanks is one second right? and i put it to stay on Loading 99% for 240 vbanks which is 4 seconds so that is what it is

---

No. What you are trying to say is that a Vblank occurs 60 times a sec which isn't true. This depends on the screens refresh rate. At the moment my PC monitor is 75hz so it has 75 vblanks. Try again.

if remeber correctly i believe it was:

play:sound(sound name here);

Zitat:

---

Zitat von yaustar

The AI tutorial is fine, it was written by someone who knows what he/she is talking about.
-= Double Post =-

No. What you are trying to say is that a Vblank occurs 60 times a sec which isn't true. This depends on the screens refresh rate. At the moment my PC monitor is 75hz so it has 75 vblanks. Try again.

---

so the below isn't true? wow I really need to start over on this

Zitat:

---

Zitat von psp-programming.com

fter all of our stuff is loaded, we are just going to quickly pause at the "Loading 100%" so our user gets a chance to see it. To do this, we'll use the "waitVblankStart" function that we talked about at the end of Lesson 01.
screen.waitVblankStart(60 )
This time we have passed a parameter to the function. This just tells it to pause for a certain amount of time. There are sixty Vblanks in a second, so this pauses our program at this point for exactly one second.

---

so the vblank is the refresh rate?

Zitat:

---

Zitat von slicer4ever

if remeber correctly i believe it was:

play:sound(sound name here);

---

will try this

Zitat:

---

There are sixty Vblanks in a second, so this pauses our program at this point for exactly one second.

---

That is correct to the PSP's screen as it refreshes at 60hz.

Zitat:

---

so the vblank is the refresh rate?

---

No. The refresh rate represents how many times the screen gets drawn per second. Every time the screen is drawn, there is one vblank.

This is why I said you ignored my post. There was a link in brackets that said, "read this" which goes to a Wiki explaining EXACTLY what a vBlank is. Obviously, you didn't read it.

Zitat:

---

Zitat von Gam3freQ

thanks i'll start from there

and the first link will help me code for psp and use a compiler for psp right? no. I seriously doubt it. Anyways the link above from Art shows BOTH C and lua even though C++ and C arn't the same thing, but I'm pretty sure they're similar. I'll start in lua so I don't need to compile :P

Ok I am just starting and all, my Hello World worked, but is there like a flash application of some sort that lets me click on a color and it will show me the RGB? (0, 0, 255 for blue, for example) because I know there is one in photoshop but that makes my computer lag like hell

EDIT: NVRM what i'm using is microsoft paint - go to colors at the top, click on edit colors, click on define custom colors, and a full RGB table will come up and if you click anywhere it shows you what the RGB values are for that color WHOOHOO yay



Ok the bold, italisized, underlined part above is where I am confused. Here is a copy/paste of what I have done so far

Code:

---

System.usbDiskModeActivate()
pink = Color.new(255, 0 , 153)
blue = Color.new(0 , 153, 255)
orange = Color.new(255, 102, 0)
gray = Color.new(150, 150, 150)
black = Color.new(0 , 0 , 0)
screen:print(194, 136, "Loading: 0%", pink)
screen.flip()
background = Image.load("images/background.jpg")
screen:clear()
screen:print(194, 136, "Loading: 20%", pink)
screen.flip()
circle = Image.load("images/buttons/circle_button.png")
down = Image.load("images/buttons/down_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 40%", pink)
screen.flip()

l = Image.load("images/buttons/left_trigger.png")
left = Image.load("images/buttons/left_arrow.png")

screen:clear()
screen:print(194, 136, "Loading: 60%", pink)
screen.flip()

r = Image.load("images/buttons/right_trigger.png")
right = Image.load("images/buttons/right_arrow.png")
boltsnd = Sound.load("music/comp.wav")

screen:clear()
screen:print(194, 136, "Loading: 80%", pink)
screen.flip()

square = Image.load("images/buttons/square_button.png")
triangle = Image.load("images/buttons/triangle_button.png")

screen:clear()
screen:print(194, 136, "Loading: 90%", pink)
screen.flip()

up = Image.load("images/buttons/up_arrow.png")
x = Image.load("images/buttons/cross_button.png")
splash = Image.load("images/lua.png")

screen:clear()
screen:print(194, 136, "Loading: 99%", pink)
screen.flip()

screen.waitVblankStart(240)
Music.volume(128)

---

Now those last two lines were copied from the quote, but he says that we are going to do screen.flip again, so I was thinking if I should make it look like this

screen.flip()
screen.waitVblankStart(24 0)
Music.volume(128)

but then again, that would do a double screen clear which would be pointless to put the same line twice, so should I put it after the screen.waitVblankStart(24 0) and before the music volume? or should I ignore that completely?

EDIT: it is now 3:00 am WHERE I LIVE so I'll go to bed and see if I can get an answer tomorrow. hopefully someone will help me so i can become a good coder in the future. I am not going to post any half-witted lua releases when I learn to code, instead, i am going to see if there are any good ideas, and if there arn't any, then I will switch to C, which I will have a basic understanding of programming applications altogether so learning C will make more sense, or i can try to completely master lua and come up with something three-quarters-witted instead of half-witted (i havn't seen any good lua applicaitons or games at all so i can't expect me to break the barrier of lua vs. C)

---

My point was that there is no difference from coding C++ for the PSP or any other system besides API specific functions in the PSPSDK. If you don't know C++ at all in the first place, then you will have no clue what you are doing. This stuff takes time, it isn't "Get up and go make a 3D game". Learn the basics and syntax of the language first, then move on the the API specific functions provided by the PSPSDK.

Does anyone know if it's possible to create a rectangle, and fill it but with a semi transparant color
I've tried check = Color.new(100,200,200,50) and check = Color.new(100,200,200,210 ) but it stays the same opacity

and another similar question, is it possible to get a PNG semi transparant, becaus I've loaded a PNG with a gradient transparancy, but it just cuts of at about 50% transparancy, everything below isn't shown, everything over is turned opaque

Zitat:

---

Zitat von _dysfunctional

My point was that there is no difference from coding C++ for the PSP or any other system besides API specific functions in the PSPSDK. If you don't know C++ at all in the first place, then you will have no clue what you are doing. This stuff takes time, it isn't "Get up and go make a 3D game". Learn the basics and syntax of the language first, then move on the the API specific functions provided by the PSPSDK.

---

If you can't see already, I have already started to learn lua and learning C++ at this point would only confuse me, so there is no reason for you to continue an arguement for no reason.
-= Double Post =-

Zitat:

---

Zitat von yaustar

That is correct to the PSP's screen as it refreshes at 60hz.


No. The refresh rate represents how many times the screen gets drawn per second. Every time the screen is drawn, there is one vblank.

This is why I said you ignored my post. There was a link in brackets that said, "read this" which goes to a Wiki explaining EXACTLY what a vBlank is. Obviously, you didn't read it.

---

So the vblank is related to the refreshrate, which is 60hz on the psp, which is why 60 vblanks take a second on the psp, because every time a hz blaublahubadung. In other words, it is the time interval between the end of the last line of one frame or field of a raster display, and the beginning of the next.
-= Double Post =-

Zitat:

---

Zitat von slicer4ever

if remeber correctly i believe it was:

play:sound(sound name here);

---

I tried once and it didn't work but will try again

Not it isn't pointless, and who was arguing? I was just saying that by being rude back to me when I was just trying to help and was correct, is ridiculous.

i agree with dys, ridiculous

Zitat:

---

Zitat von _dysfunctional

Not it isn't pointless, and who was arguing? I was just saying that by being rude back to me when I was just trying to help and was correct, is ridiculous.

---

I'm sorry, you were right, but I can't even figure out how to play comp.wav in lua so how can I figure out how to do C++:Cry:

Code:

---

soundvar = Sound.load("sound.wav")

soundvar:play()

---

Zitat:

---

Understanding how the pixels in memory are displayed on the screen is important for writing games. The concept of many displays, including the one for the PSP, are the same like for the old cathode ray tube: A beam starts at top left and scans all lines top down. At the bottom it needs some time for returning to the top left, which is called the vertical blank (vblank), because the beam is deactivated while moving back to it’s start position. Of course, in PSP there is no real beam, but you can think of it as if it works like this. With “screen.waitVblankStart() ” the script waits for the start of this vblank. While the vblank time no pixels are written to the display, which gives you the time to flip the screen and offscreen to avoid flickering.

---

Zitat:

---

Zitat von michaelp

Code:

---

soundvar = Sound.load("sound.wav")

soundvar:play()

---

---

on the first quote - thanks i was able to figure out Sound.load but not how to play it

on the second quote - yes that does help alot - increases understanding of why when I was doing screen.flip() instead of the vblank thing it wouldn't let me press more than one button at a time but now it makes alot more sense thank you for both quotes they really helped we need more people like you around here :Punk:

you said you want to play comp.wav...

Code:

---

comp = Sound.load("comp.wav") --This loads your sound file
some code
some code
--Now, if you wanted to play the file, you'd do this:
comp:play() --This plays your sound

---

Also, you only need one "screen.flip" in your script.