r*****y
发帖数: 507 | 1 I tried to get pixel value in frame buffer by glGetPixels function,
but failed.I don't know the reasons.
my code is as follows:
...
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_SWAP_BYTES,0);
glPixelStorei(GL_UNPACK_LSB_FIRST,0);
glPixelStorei(GL_UNPACK_SKIP_PIXELS,1);
glClearColor(1.0f, 1.0f, 1.0f, 1.0f) ;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glFlush();
GLenum errorcode;
// this window size is larger than 100*100.
| l**p
发帖数: 474 | 2 you just cleared your color buffer,,..... so it is 0.
【在 r*****y 的大作中提到】
: I tried to get pixel value in frame buffer by glGetPixels function,
: but failed.I don't know the reasons.
: my code is as follows:
: ...
: glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
: glPixelStorei(GL_UNPACK_SWAP_BYTES,0);
: glPixelStorei(GL_UNPACK_LSB_FIRST,0);
: glPixelStorei(GL_UNPACK_SKIP_PIXELS,1);
: glClearColor(1.0f, 1.0f, 1.0f, 1.0f) ;
: glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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