[Solved] Simplest Vertex/Fragment Shaders using QGLWidget Derivation

ZapB

No worries, real life happens - especially when nice weather lands ;-)

I have just checked and the patch to Qt master that I mentioned earlier has no been applied. So now shaders should work even if you select the Core profile.

The main part of the patch is in src/opengl/qgl.cpp in the helper class QGLExtensionMatcher found "here":https://qt.gitorious.org/qt/qt/blobs/master/src/opengl/qgl.cpp#line5373.

The corresponding commit message was:

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commit 2f59eaeee1fbe33d07b0e7d0747afd8658df95ac
Author: Samuel R<C3><B8>dal sroedal@trolltech.com
Date: Wed May 26 16:39:02 2010 +0200

Made extension resolving work with Core profile.

The Core profile was introduced in OpenGL 3.2 and if chosen removes
all deprecated functionality from the OpenGL API.

In the Core profile glGetString(GL_EXTENSIONS) is unsupported, so
instead we need to use glGetStringi(GL_EXTENSIONS, index) together with
glGetIntegerv(GL_NUM_EXTENSIONS). Also optimized the QGLExtensionMatcher
to not have to recompute the split positions all the time.

Preliminary support to prevent non-core-functions to be called in the GL
2 engine has also been added.

Reviewed-by: Kim

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Hornsj2

removed.

Hornsj2

The fact that I can't just configure/nmake like I do with qt-everywhere-opensource is crushing my soul to the point where I'm going to call it for the night. I'll have to figure out this workflow.

Hornsj2

I'm just going to diff my changes with the repository and not worry about building from gitorious.

ZapB

If you are trying to build a checkout from gitorious you need to have perl installed. The reason is that the configure script calls a perl script called syncqt which is used to create the camelcase forwarding headers that allow you to do this:

@#include <QCoreApplication>@

These headers are generated to simply contain something like

@#include "../include/qtcore/qcoreapplication.h"@

I fell for this same problem too on windows. On linux it just works since perl is nearly always already available.

Edit: fixed typo.

Hornsj2

Great answer again, thank you. I posted the same question in the correct forum. I'm going to consider this thread closed and move my updates to my tessellation shader thread.

ZapB

No problem. You're welcome.

ZapB

Sorry to bump an old thread but I've just written a related "wiki article":http://developer.qt.nokia.com/wiki/How_to_use_OpenGL_Core_Profile_with_Qt on this topic that shows how to use the OpenGL Core profile with Qt using some very simple shaders and a single triangle.

number23

moved to new "thread":http://developer.qt.nokia.com/forums/viewthread/11031/