用到了glReadPixels glDrawPixels glCopyPixels来创建和拷贝位图-uses glReadPixels glDrawPixels glCopyPix els to create and copy bitmap

用到了glReadPixels glDrawPixels glCopyPixels来创建和拷贝位图-uses glReadPixels glDrawPixels glCopyPix els to create and copy bitmap

abgr.c - Demonstrates the use of the extension EXT_abgr. The same image data is used for both ABGR and RGBA formats in glDrawPixels and glTexImage2D. The left side uses ABGR, the right side RGBA. The top poly