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daw42 / glslcookbook

Example code for the OpenGL Shading Language Cookbook - 2nd Edition (3rd Edition now available)

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Forward Compatible Context

fenbf opened this issue · comments

commented

should Forward Compatible Context flag be really used?

I've found this answer at StackExchange and it says:

Never, ever, ever, EVER use FORWARD_COMPATIBLE for ANYTHING.

So maybe this line from main.cpp

    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

should be simply removed?

commented

I think you are mistaking GLUT and GLFW (two different libraries). I believe that forward compatible contexts can be used safely in GLFW.

Wes

From: Bartłomiej Filipek [mailto:notifications@github.com]
Sent: Thursday, February 05, 2015 1:06 AM
To: daw42/glslcookbook
Subject: [glslcookbook] Forward Compatible Context (#29)

should Forward Compatible Context flag be really used?

I've found this answer at StackExchangehttp://gamedev.stackexchange.com/a/28332/34216 and it says:

Never, ever, ever, EVER use FORWARD_COMPATIBLE for ANYTHING.

So maybe this line from main.cpp

glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

should be simply removed?

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/29.

commented

all in all those flags goes to native OS API calls (wgl, glx...) and even on OpenGL wiki page Creating OpenGL Context WGL there is a note that forward compatible context should not be used.

commented

This book is based on OpenGL 4.0 so I believe that a forward compatible context may be appropriate. Also the OpenGL wiki is not necessarily the most up to date: that link you referenced is OpenGL 3.x

Wes

From: Bartłomiej Filipek [mailto:notifications@github.com]
Sent: Thursday, February 05, 2015 1:11 AM
To: daw42/glslcookbook
Cc: Wes Reardan
Subject: Re: [glslcookbook] Forward Compatible Context (#29)

all in all those flags goes to native OS API calls (wgl, glx...) and even on OpenGL wiki page Creating OpenGL Context WGLhttps://www.opengl.org/wiki/Creating_an_OpenGL_Context_(WGL) there is a note that forward compatible context should not be used.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/29#issuecomment-73015310.

commented

Thanks for the note. It's interesting that people have such strong opinions about this.

I chose to use a forward compatible context because I wanted to make sure that I was only using non-deprecated features in a 4.x core profile. I think that the comment on StackExchange is a bit over the top. If you really want to stick with just non-deprecated features, there's nothing wrong with using a forward compatible context. The statement on the OpenGL Wiki doesn't elaborate as to why one should not use a forward compatible context. I'd be interested to hear why that statement is there.

Regardless, it wouldn't hurt to remove it, but I currently don't see the harm of using it.