WarAmp

You will need to give us more than just your drawing code if you want us to help with a collision issue

It's likely that you are only testing ballvec.X/Y in your collision routine rather than the whole Rectangle, show us how you are determining the collision and 'bounce' and we can help you further

struct MyVertex
{
float x, y, z;  // Vertex
float nx, ny, nz; // Normal
float u, v;   // Texcoords
float a, r, g, b; // Color
float padding[4];
};

My openGL is a bit rusty, but I believe you want the value passed into the gl*Pointer() functions to actually point to the part of the struct that is relevant.
ie:

glNormalPointer(  GL_FLOAT, sizeof(MyVertex), &(*RenderListIT)->RenderMesh->VertexData.nx  );
glTexCoordPointer( 2, GL_FLOAT, sizeof(MyVertex), &(*RenderListIT)->RenderMesh->VertexData.u  );
glColorPointer(  3, GL_FLOAT, sizeof(MyVertex), &(*RenderListIT)->RenderMesh->VertexData.a  );
//etc....

If all you have is A(x, y) and B(x, ?) you simply don't have enough data. There are an infinite number of lines that pass through A(x,y) and the boundary B(x, ?).

You can set ? to any value and create a line, but there is no single specific line.
If you have an angle already, then JTippets post explains how to solve for ?.

Ok Mike4, one more time:

What are you trying to do? There seems to be a language barrier issue here, perhaps describe your problem in your native language, and another poster can help you that way?

I can only use x,y,z and heading for source and listener.

What do you mean by this? Are you saying that you have the location and heading angle of both the Source AND the Listener? If that's the case, you would use alListener3f with AL_POSITION to set the x,y,z and then use a separate call to alListener3f with AL_ORIENTATION to set the orientation. A quick google search will tell you how to use the given heading with alListener to create the 'at' and 'up' vectors you need.

If you only have partial information about the listener/source then please tell us explicitly the information you have.

If you are just trying to transform [0, 360] to [180, -180] then just:

newAngle = 180 - angle;

But what would really help us help you is some context. We can sort of see that you are having a problem with OpenAL, but other than just saying 'Not hearable at certain angles' we have no idea what you are doing vs. what the result is you are trying to achieve. Maybe even draw us some pictures to illustrate the problem?

Spend some time explaining the situation and we can spend more time trying to help. The more information you give us, the more we have to work with.