can't seem to access opengl constants

in Contributed Library Questions • 1 year ago

does anyone know why i would get a "Cannot find anything named 'GL_ALL_ATTRIB_BITS'" error? im getting it on 2.0a3 and 1.5.1, here is the code i'm trying to run - its a modified version of the glslshader demo in GLGraphics examples:

void draw() {
background(250);
GLGraphics renderer = (GLGraphics)g;
renderer.beginGL();
// Push the GL attribute bits so that we don't wreck any settings
glPushAttrib(GL_ALL_ATTRIB_BITS);
// Enable polygon offsets, and offset filled polygons forward by 2.5
glEnable(GL_POLYGON_OFFSET_FILL);
glPolygonOffset(-2.5f, -2.5f);
// Set the render mode to be line rendering with a thick line width
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glLineWidth(3.0f);
// Set the colour to be white
glColor3f(1.0f, 1.0f, 1.0f);
// Set the polygon mode to be filled triangles
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glEnable(GL_LIGHTING);
// Set the colour to the background
glColor3f(0.0f, 0.0f, 0.0f);
// Pop the state changes off the attribute stack
// to set things back how they were
glPopAttrib();
renderer.endGL();
// The light is drawn after applying the translation and
// rotation trasnformations, so it always shines on the
// same side of the torus.
pointLight(0, 160, 255, -1, 0, 0);
lights();
// Centering the model in the screen.
translate(width/2, height/2, 0);
angle += 0.01;
rotateY(angle);
// Any geometry drawn between the shader's stop() and end() will be
// processed by the shader.
shader.start(); // Enabling shader.
renderer.model(torus);
shader.stop(); // Disabling shader.
}

it's the highlighted code im having trouble with. any help would be greatly appreciated.

Replies(5)

kooogy

Re: can't seem to access opengl constants

1 year ago

i think you need to specify the class that that attribute is defined in, ie:

GL.GL_ALL_ATTRIB_BITS

riceje7

Re: can't seem to access opengl constants

1 year ago

okay i had tried opengl. and glconstants. but not gl. i'm mobile right now I'll let you know if it works when i get home

riceje7

Re: can't seem to access opengl constants

1 year ago

okay so it no longer says that i can't access the constants, now it is telling me that the gl functions (i.e. glPushAttrib, glEnable, etc.) don't exist, any ideas?

kooogy

Re: can't seem to access opengl constants

1 year ago

are you new to java, perchance? because this is standard java (indeed standard oop) stuff.

the constants are statics and are therefore referenced in relation to the classname, GL.WHATEVER (GL is the classname, the last bit of the import statement that references them)

the methods, glPushAttrib() aren't static and belong to the *instance* of the class, renderer in your case.

so that would be renderer.glPushAttrib();

see, for instance http://www.java-tips.org/other-api-tips/jogl/bump-mapping-multi-texturing-and-extensions-nehe-tutorial-jogl.html where he uses the more traditional gl as the name for his GlGraphics instance meaning that it's full of things like

gl.glEnable(GL.GL_TEXTURE_2D);

riceje7

Re: can't seem to access opengl constants

1 year ago

not new to java, but new to OPENGL. adding the instance name (renderer) to the function call was one of the first things i tried, i should have mentioned that, but it still gives me the error. could it perhaps be something to do with the fact that the instance is of GLGraphics type and not of GL? i'll check out the link you posted and see if that solves it at all. thanks for all your help so far.

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