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> Windows > Troubles with openGL |
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Fred
Been toying with openGL and trying to do 2D tile drawing and looked at this page for tips. According to this dood I can use gluOrtho2D (or glOrtho i guess) to set up a nice coordinate system thing on my window. But... well. It's not working. Setting glOrtho to anything but a square makes the screen go black and setting it to a square does nothing (screen coords remain as -1 to 1). I have no idea how to fix it.
 Can someone help me?
The reason i'm posting about openGL problems here is because I'm not sure if the error springs from my unawesome asm code or if my openGL knowledge is lacking... help is appreciated. 
Here's my current code: http://pastebin.com/g6H8nVnS (glOrtho is on line 123, and most of my other openGL code is around there too) And if you want to run it: used includes and the image. Just put the folder in the fasm include folder and yeah.raw in the same folder as the code. I have ninja'd code from various places (but mostly from here). And I'll say this now... I have never used openGL before. |
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27 Feb 2011, 20:16 |
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SFeLi
Both gluOrtho2D and glOrtho accept double arguments and you're passing floats. Include win32ax.inc instead of win32a.inc and prefix arguments with 'double' keyword.
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28 Feb 2011, 06:55 |
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Xorpd!
You have to handle the WM_SIZE message and set your viewport there.
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28 Feb 2011, 07:17 |
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Xorpd!
Your reply has piqued my curiosity: did you finally come up with something that worked but yet did not handle the WM_SIZE message? Could you post your working example?
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28 Feb 2011, 20:22 |
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Fred
Hmm, well, all I did was copying the openGL example:
Code:
cmp [wmsg],WM_CREATE
je .wmcreate
cmp [wmsg],WM_SIZE
je .wmsize
[...]
.wmcreate:
invoke GetDC,[hwnd]
mov [hdc],eax
mov edi,pfd
mov ecx,sizeof.PIXELFORMATDESCRIPTOR shr 2
xor eax,eax
rep stosd
mov [pfd.nSize],sizeof.PIXELFORMATDESCRIPTOR
mov [pfd.nVersion],1
mov [pfd.dwFlags],PFD_SUPPORT_OPENGL+PFD_DOUBLEBUFFER+PFD_DRAW_TO_WINDOW
mov [pfd.iLayerType],PFD_MAIN_PLANE
mov [pfd.iPixelType],PFD_TYPE_RGBA
mov [pfd.cColorBits],16
mov [pfd.cDepthBits],16
mov [pfd.cAccumBits],0
mov [pfd.cStencilBits],0
invoke ChoosePixelFormat,[hdc],pfd
invoke SetPixelFormat,[hdc],eax,pfd
invoke wglCreateContext,[hdc]
mov [hrc],eax
invoke wglMakeCurrent,[hdc],[hrc]
invoke GetClientRect,[hwnd],rc
invoke glViewport,0,0,[rc.right],[rc.bottom]
invoke GetTickCount
mov [clock],eax
xor eax,eax
jmp .finish
.wmsize:
invoke GetClientRect,[hwnd],rc
invoke glViewport,0,0,[rc.right],[rc.bottom]
xor eax,eax
jmp .finish
[...]
Since the viewport is set up in .wmcreate i went ahead and removed the .wmsize section. For some reason I can't resize the window, so .wmsize would do nothing anyway. |
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28 Feb 2011, 21:34 |
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