Find content
Not Telling
Posted by void mapAndCopyToBuffer(char* img1)
{
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pixelbufferHandle);
mappedBuf = (char*) glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
memcpy(mappedBuf, img1, w * h * s);
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
mappedBuf = NULL;
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixelbufferHandle);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, 0);
}seems like you don't free your mappedBuf after using it. you need to do this if you want to really free some memory:
void mapAndCopyToBuffer(char* img1)
{
glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pixelbufferHandle);
mappedBuf = (char*) glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
memcpy(mappedBuf, img1, w * h * s);
glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
delete [] mappedBuf; //this is what you need, see explanation below
mappedBuf = NULL;
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pixelbufferHandle);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, 0);
}
this indicates you're not completely aware of how to use pointers.
to clear things up:
int* pointer = 0; // creates an 8-byte pointer to an integer, pointer's value is 0 (Null-pointer) EDIT: yep it was unintialized...
int value = *pointer; // ERROR: you tried to access the contents of a null-pointer, this is illegal
pointer = new int; // dynamically (at runtime) assigns 4 bytes of memory at the place which is pointed by pointer, pointer is now valid
int value_2 = *pointer; // VALID: pointer actually points to somewhere, so value_2 should be either 0 or a random number, this depends on the compiler
delete pointer; // tells the operating system to free the place pointed by pointer
int value_3 = *pointer; // VALID: pointer still points to somewhere in the memory, and most probably you'll get back the old value pointed by pointer, since nothing has overwritten it. BUT this cannot be guaranteed (so DO NOT do this)
pointer = 0; // now pointer is a null-pointer again, but this doesn't free up any space, as opposed to delete
int value_4 = *pointer; //ERROR: you tried to access a null pointer again.
// for arrays you need to use this:
pointer = new int[32]; // allocate 32 integers (4 bytes per int) to the place pointed by pointer
//pointer will actually point to the first element of the array meaning this will be valid, and give a value:
int value_5 = *pointer; // VALID: gives back pointer[0]
delete [] pointer; //this frees up the space pointed by pointer, but pointer will still be valid, so you need to set it to 0
pointer = 0; // now pointer is a null-pointer again
// to check wether pointer is valid you can use a simple if
if(pointer) // if pointer is 0 (logical false) it will be invalid (null-pointer) else it will be valid
{
std::cout << "Pointer is valid.\n";
}
else
{
std::cout << "Pointer is INvalid.\n";
}
oh and please write back if this solved your problem.
best regards,
Yours3!f
