Hello Claude,
My problem is everywhere hahaha. I haven't been able to do anything with textures, but those steps do sound like the way to go. Maybe if you could explain them a little bit more I'll do it, or maybe with the examples you mentioned I'll get it myself.
When you say 'load' is the hardest: In all the tutorials or codes I've seen, I haven't been able to find any function which has that kind of signature, but I really have no idea on how to do such function myself :s. I really thought maybe OpenGL provided some functions to do it...
upload :: .... -- upload to the Graphics Card?
I've used OpenGL in C++ and adding a texture is so easy, Probably I did all 3 steps you mention, but I never really worried about them, I just did it without paying attention on what was happening underneath.
draw :: ... This does sounds like what I used to do in C++ and it's what I was hoping to find in Haskell...
Thank you,
Hector Guilarte
On Sun, Jul 11, 2010 at 10:06 AM, Claude Heiland-Allen
<claudiusmaximus@goto10.org> wrote:
Hi Hector,
On 11/07/10 03:02, Hector Guilarte wrote:
> I've been looking for a way to map a texture into a Quad primitive with
> HOpenGL with no luck.
[snip]
I'm having trouble understanding where your problem is.
There are three steps to texturing using an image file:
load :: FilePath -> IO Image -- read file to raw pixel buffer
upload :: Image -> IO TextureObject -- upload to graphics card
draw :: TextureObject -> IO () -- use the texture on something
where
data Image = Image{ width, height, channels :: Int, pixels :: Ptr () }
Which step is problematic?
'load' is the hardest IMO, and doesn't have anything to do with OpenGL.
'upload' I would implement with 'build2DMipmaps'
'draw' is easy: bind the texture, add a 'texCoord' before each 'vertex'
I could provide some example code for 'upload' and 'draw' if you think it would help.
Claude
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