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function texid = moglGetTexForFBO(fbo, bufferid)
% texid = moglGetTexForFBO(fbo, bufferid) -- Return texture name of texture which is
% bound to the specified 'fbo' Framebuffer object as color buffer number 'bufferid'.
% bufferid defaults to 1, aka the first attached color buffer.
% History:
% 30.5.2006 Written (MK).
global GL;
% Child protection:
AssertGLSL;
if nargin < 1
error('moglGetTexForFBO called without fbo argument.');
end;
if fbo == 0
texid = 0;
return;
end;
if nargin < 2
bufferid=1;
end;
if isempty(bufferid)
bufferid=1;
end;
% Child protection:
if ~glIsFramebufferEXT(fbo)
error('Invalid fbo identifier passed. This is not a valid FBO.');
end;
boundfbo = glGetIntegerv(GL.FRAMEBUFFER_BINDING_EXT);
if boundfbo~=fbo
% fbo currently unbound. Bind it:
glBindFramebufferEXT(GL.FRAMEBUFFER_EXT, fbo);
end;
% Query its texture attachments and destroy them:
texid = glGetFramebufferAttachmentParameterivEXT(GL.FRAMEBUFFER_EXT, GL.COLOR_ATTACHMENT0_EXT + bufferid - 1, GL.FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT);
% Rebind previous fbo, unless we were bound:
if boundfbo~=fbo
% Reset to last bound FBO:
glBindFramebufferEXT(GL.FRAMEBUFFER_EXT, boundfbo);
end;
% Done.
return;
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