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rafaelvasco (orginal) [2012-05-26T19:08:47+02:00] view original

Hi, just discovered Nimrod and i'm liking it so far. But since i'm a game developer i have to ask: What is the state of the OpenGL bindings ? And is there a bind for some window manager like GLFW ? Or maybe SDL ? Can i already start playing with some simple opengl ? Thanks !

dom96 (orginal) [2012-05-26T20:54:08+02:00] view original

Hello and welcome!

I have not tried the OpenGL bindings personally, so I'm not sure what their status is. Best thing to do is to try them out yourself and let us know any issues you find, you can also of course fix them yourself if you find that they are broken.

SDL on the other hand I've tried, it works quite well. There is a graphics module which uses SDL as the backend in the stdlib.

Araq (orginal) [2012-05-26T22:03:48+02:00] view original

There is a new wrapper in wrappers/opengl/opengl.nim (on github) that is based on glew and a much older wrapper in wrappers/opengl/gl.nim. I didn't try the new one, please report any problems.

rafaelvasco (orginal) [2012-05-27T04:10:53+02:00] view original

Thanks ! I'll try to get something simple running first then.

rafaelvasco (orginal) [2012-06-01T17:22:25+02:00] view original

Just updating: I did a preliminary bind for GLFW library, i like it better than SDL. I then tested just the basic window first, open window, while running, get escape key pressed etc. It works. At least this :) I used glfw.h header and other nimrod bindings as reference. Nice result for my first try :) Even though there's some things missing, and other things may not work yet of course. Then i added opengl in the code, first a simple glClearColor, glClear, works OK. Now i want to draw something. I need to clear depth too along with color so i need glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) . That means an OR like operator to merge the arguments. Does nimrod support this ? If not what's the alternative ? Thanks.

renoX (orginal) [2012-06-01T18:05:47+02:00] view original

From the first tutorial: "The and or xor not operators are defined for integers too and provide bitwise operations." So glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT) should work, I think.

BR.

rafaelvasco (orginal) [2012-06-01T18:35:59+02:00] view original

Thanks! Worked. Now i have to figure out why it isn't drawing anything. I change to a simple quad instead of a cube first.

rafaelvasco (orginal) [2012-06-01T19:33:21+02:00] view original

Got a triangle drawing. Success ! Now for a super spinning triangle :D

rafaelvasco (orginal) [2012-06-01T20:09:19+02:00] view original

Everything working so far. Currently a triangle that rotates with mouse, so that it tests input too. It calculates fps and puts it on window constant 60FPS as expected . All OK. So Araq, new opengl binding seems to be working perfectly. Now i just have to keep testing my glfw binding. And a question : How to better wrap unsigned char* and const void* parameters ?

Araq (orginal) [2012-06-01T23:23:03+02:00] view original

Please consider to put your glfw binding on github. We need more projects there.

How to better wrap unsigned char* and const void* parameters ?

const void* is pointer and char* is often cstring.

rafaelvasco (orginal) [2012-09-30T19:58:15+02:00] view original

Thanks, hadn't realized you had an IRC address :)

Araq (orginal) [2012-10-10T01:14:15+02:00] view original

I cleaned up the extension loading for the OpenGL wrapper but couldn't test it. Please try it out: Now you need to call loadExtensions after you got a rendering context (and get rid of the openglInit hack).

rafaelvasco (orginal) [2012-10-10T03:12:07+02:00] view original

Thanks. Gonna test it now.

rafaelvasco (orginal) [2012-10-10T03:29:53+02:00] view original

loadExtensions() causes 'undefined reference to nimLoadProcs0' collect2: ld returned 1 exit status Error: execution of an external program failed.

Araq (orginal) [2012-10-10T20:15:43+02:00] view original

Well your code needs to use an extension proc otherwise loadExtensions indeed causes a linker error ... The wrapper still does not distinguish properly between extensions and core procs... Damn.

rafaelvasco (orginal) [2012-10-11T00:19:22+02:00] view original

Hum. Yeah this extensions part of OpenGL is a pain indeed..

rafaelvasco (orginal) [2012-10-12T01:14:40+02:00] view original

@fowlmouth How did you manage to run this ? I still get 'undefined reference to nimLoadProcs0';

fowl (orginal) [2012-10-13T00:56:10+02:00] view original

Ah sorry, you have to change the ogl/wgl pragmas (line 88 in lib/wrappers/opengl/opengl.nim) to use "0" instead of ""

I'm about to do a pull request for this shortly

rafaelvasco (orginal) [2012-10-13T22:47:29+02:00] view original

Problem solved ! Mission Accomplished :D Many thanks @Araq and @fowl !

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17 :: OpenGL