CODEWITHSUNDEEP
openglstackglreadpixels
Milo
Milo

Reputation: 185

glReadPixels: Stack around variable was corrupted after read pixels

I am trying to use glReadPixels() to read a window of 5 * 5 pixels. Here is the code.

const unsigned int WINDOW_SIZE = 5;
const unsigned int NB_COMPONENTS = 3;
GLubyte array[NB_COMPONENTS * WINDOW_SIZE * WINDOW_SIZE];
glReadPixels( 0, 0, WINDOW_SIZE, WINDOW_SIZE, GL_RGB, GL_UNSIGNED_BYTE, array);

Yet this code causes the following error in visual studio: "Stack around variable array was corrupted"

If I add +4 to the size of the array it works fine. Does someone knows why?

Upvotes: 1

Views: 291

Answers (1)

genpfault
genpfault

Reputation: 52167

Since you're using GL_RGB make sure GL_PACK_ALIGNMENT is set to 1.

Upvotes: 1

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