OpenGL changing/reloading textures

0
votes
glDeleteTextures(total, &Item::texture[0]);
glGenTextures(total, &Item::texture[0]);

Iteration for all images, total;

glBindTexture( GL_TEXTURE_2D, Item::texture[i] );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

Tries to reload the textures, however it does not. Textures stay the same, unchanged. Any ideas how this could/should be handled? For clarity, I'm trying to reload a texture with a new one, preferably without changing the number of the texture (since there can be a lot of changes).

I'm working with Qt, C++. The code above is in a static function in a seperate GLwidget.

1
c++qtopengl
The interesting thing is that you always delete the texture at index 0 and generates a new one at the same index (0), but then you bind the texture at index i. Something smells funny.. – karlphillip
@karlphillip total is the count of textures and the second parameter the array start pointer. But why delete and recreate the textures again and again when just the data changes? – Stefan Hanke
Mmm.. you might be right, gonna check that out. – RobotRock
So how can I change the data in an other way than deleting and creating then? – RobotRock
Any chance you're bound to the wrong rendering context, or no rendering context at all, when you're making these calls? – Nathan Monteleone

1 Answers

3
votes

Any chance you're bound to the wrong rendering context, or no rendering context at all, when you're making these calls?