glReadPixels

idinkin · 2003-10-17T04:20:29

I get 205 for red, green and blue after I call glReadPixels although the screen is not gray... I tried to call the function before and after SwapBuffers... What do I do wrong? Here is the function: bool __declspec(dllexport) PrintScreen(CGraphController controller) { FILE *f; GLubyte *buf = new GLubyte[controller.screenWidth * controller.screenHeight * 3]; char *dimensions = new char[20]; glReadPixels(0, controller.screenHeight, controller.screenWidth, controller.screenHeight, GL_RGB, GL_UNSIGNED_BYTE, (void *)buf); if(!(f = fopen("screenie.idg", "w"))) { Log("Can not open file for writing!", __FUNCSIG__); return false; } sprintf(dimensions, "%d %d ", controller.screenWidth, controller.screenHeight); fputs(dimensions, f); fwrite(buf, controller.screenWidth * controller.screenHeight * 3, 1, f); fclose(f); }

Graphics and GPU Programming Programming

Started by idinkin October 16, 2003 07:20 AM

31 comments, last by idinkin 20 years, 6 months ago

idinkin

100

Author

October 17, 2003 03:47 AM

I have tried both of them...
Maybe it's the graphics card making problems.. I have a really old card ATI 3d rage II. How do you think should the glReadPixels work at all on this card? Should I install the ATI drivers coz the drivers I have now are the Windows XP drivers...

[edited by - idinkin on October 17, 2003 4:48:37 AM]

Sometimes movement is a result of a kick in the ass!

VolkerG

151

October 17, 2003 04:10 AM

In the second version (the one with seperated R,G,B reads) you should acces witebuf[i*3], [i*3+1] and [i*3+2].

idinkin

100

Author

October 17, 2003 04:20 AM

Thank you VolkerG! Now it works!

Sometimes movement is a result of a kick in the ass!

glReadPixels

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glReadPixels

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