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Huzaifa Gain

OpenGL how save screen shots

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hi i am trying to save screen shots of the opengl window.i am using C# and CsGL
 
variable:
public long width,i,j;
		 public long bitsize; 
		 public int[] viewport= new int[4];

public uint []  pixel= new uint[115200];
Code 
GL.glGetIntegerv(GL.GL_VIEWPORT, viewport);
				 width=this.viewport[2]*3;
				 width=(this.width + 3) & ~3;
				 bitsize=width*viewport[3];
				  GL.glPixelStorei(GL.GL_PACK_ALIGNMENT, 4); /* Force 4-byte alignment */
				 GL.glPixelStorei(GL.GL_PACK_ROW_LENGTH, 0);
				 GL.glPixelStorei(GL.GL_PACK_SKIP_ROWS, 0);
				 GL.glPixelStorei(GL.GL_PACK_SKIP_PIXELS, 0);
        		 GL.glReadBuffer(CsGL.OpenGL.GL.GL_BACK);
				 GL.glReadPixels(0,0,viewport[2],viewport[3],GL.GL_RGB,GL.GL_UNSIGNED_BYTE,pixel);

NOW THE PROBLEM IS NOTHING IS GETTING IS SAVED IN PIXEL VARIABLE EXCEPT OF ZERO PLEASE IDENTIFY THE ERROR [Edited by - phantom on September 1, 2005 5:23:29 PM]

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I dont like this line

glPixelStorei(GL_PACK_ROW_LENGTH, 0);

You should pass the actual length of your row (width)

I dont like this line too

glPixelStorei(GL_PACK_ALIGNMENT, 4);

if you are using RGB/BYTE every pixel is 8*3 = 24 bit so I would use 1 or 3.

PS: have you wrapped the entire API?

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Using the Tao Framework might be a better idea then using CSGL. Tao.OpenGl uses P/Invoke to call the OpenGL functions directly as opposed to reinventing the wheel. I made up some compilations of some of the libraries they provide and uploaded them to my server here. Just link to Tao.OpenGl.dll and you'll be good to go. The Tao Framework is also updated more often [wink].

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