glGetFloatv ?????????

void glGetFloatv(
  GLenum pname,
  GLfloat * params
); 

The *params is a pointer to a suitably sized array to receive the data you''re requesting. The pname specifies what data you''re actually requesting (like GL_MODELVIEW_MATRIX).

Different parameters return differently sized amounts of data, so you have to make sure your array is big enough to hold it. The MODEL_VIEW matrix for example needs an array to hold 16 floats.

quote:

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Original post by OrangyTang

void glGetFloatv(
  GLenum pname,
  GLfloat * params
);    

The *params is a pointer to a suitably sized array to receive the data you're requesting. The pname specifies what data you're actually requesting (like GL_MODELVIEW_MATRIX).

Different parameters return differently sized amounts of data, so you have to make sure your array is big enough to hold it. The MODEL_VIEW matrix for example needs an array to hold 16 floats.

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But why do I need to return that data, and what happends with
that data after it returns ?
Does this meens that I'm requesting to push m[] matrix into
modelview OR projection


[edited by - cpp_boy on February 1, 2004 10:05:03 AM]

whatever you want... you reqested it after all..

If for example you wanted to find out what the current colour was you could do:

float currentColour[4]; // allocate a big enough array
glGetFloatv(GL_CURRENT_COLOR, currentColour); 

currentColour would then contain the current colour.

Enigma

Thanks for the help guys, cos no google nor my opengl books
were able to help me......

Thanks again and seeya soon

[edited by - cpp_boy on February 1, 2004 10:29:15 AM]

Yes. For example, if you do:

glColor4f(1, 0, 1, 0);
// lots more code here
float currentColour[4];
glGetFloatv(GL_CURRENT_COLOR, currentColour); 

then currentColour[0] will be 1, currentColour[1] will be 0, currentColour[2] will be 1 and currentColour[3] will be 0.

Enigma

THANKS GUYS, now I understand.

I have tomorow final test in graphics in my university, so I"ll study now, THANKS and seeya