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Re: GLCtrl questions [message #28717 is a reply to message #28706]

Mon, 13 September 2010 20:01

281264
Messages: 272
Registered: June 2010
Location: Spain

Experienced Member

Hi cbpporter,

Not being an OpenGL expert (I am currently using a limited portion of it and not for games, btw) these are my answers:

1.- GLCTrl is a way to create a substratum for the usage of OpenGL in Windows: i.e. specification of pixelformatdescriptor, creation of an OpenGL rendering context (by using wglCreateContext(), and so on. These features are easily recognizable in the code. I suggest you to have a look to the well known �Red book�, available for free in the internet(not the latest version, but it is ok: http://fly.cc.fer.hr/~unreal/theredbook/). Also have a lookt at the example included in the reference assembly of TheIde.

Yes, you can create anything in OpenGL by using GLCTrl. For example, the function in GLCTrl.cpp:

void GLCtrl::StdView()
{
	glShadeModel(GL_SMOOTH);
	glClearColor(0.0f, 0.0f, 0.0f, 0.5f);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);
	glDepthFunc(GL_LEQUAL);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

	Size sz = GetSize();
	glViewport(0, 0, (GLsizei)sz.cx, (GLsizei)sz.cy);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f, (GLfloat)(sz.cx)/(GLfloat)(sz.cy), 1.0f, 100.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

sets up the basic features you need: viewport, type of perspective projection (gluPerspective in this case, although I am currently using glOrtho), etc..

Yes, you can have more than one OpenGL views at the same time. Just generate a second drawing/geometry and �project� it in a different viewport within the main window. You can use docking and dock a different windows adjacent to the �central� window.

2.- I have never tried that for I never needed it.

3.- As long as you are able to create a window without borders, capable to occupy the whole screen (which is not related with OpenGL), then OpenGL will occupy the full screen.

BTW I am interested in working with a TopWindow in U++ capable to occupy the full screen, i.e. to use the screen space used by the lower Windows toolbar; any hint how to do it?

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