Opengl layers?

Graphics and GPU Programming Programming OpenGL

Started by ThaGonzo September 18, 2007 02:39 AM

2 comments, last by OrangyTang 16 years, 7 months ago

122

Author

September 18, 2007 02:39 AM

Is it possible to make different layers in openGL? because i have an 3d-scene, and i want to create an 2d-layer in front of it, so i can make things like buttons and text fields in front of the scene. Is there anyone who knows how to do this? Greetz, Leon

V-man

813

September 18, 2007 02:50 AM

glMatrixMode(GL_PROJECTION);glLoadIdentity();glOrtho(0.0, windowwidth, 0.0, windowheight, -1.0, 1.0);glMatrixMode(GL_MODELVIEW);glDisable(GL_DEPTH_TEST);glDepthMask(GL_FALSE);

You can tweak the values for glOrtho to your liking.

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

ThaGonzo

122

Author

September 18, 2007 03:12 AM

You mean something like:

glMatrixMode(GL_PROJECTION);glLoadIdentity();gluPerspective(45.0f, (GLfloat)1920/(GLfloat)1200, 0.1f, 2000.0f);glMatrixMode(GL_MODELVIEW);glBegin(GL_QUADS);(3d gl objects)glEnd();glMatrixMode(GL_PROJECTION);glLoadIdentity();glOrtho(0.0, windowwidth, 0.0, windowheight, -1.0, 1.0);glMatrixMode(GL_MODELVIEW);glDisable(GL_DEPTH_TEST);glDepthMask(GL_FALSE);glBegin(GL_QUADS);(2d gl objects)glEnd();

OrangyTang

1,298

September 18, 2007 03:26 AM

That's the usual way of doing it (although you don't have to draw all your objects in a glBegin/End call). Also remember you need to reenable the depth test and depth writing at the start of the next frame otherwise the state will carry over.

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Opengl layers?

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Opengl layers?

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