I’m trying to update a small portion of a larger image with glTexSubImage2D, but it appears corrupted somehow. I’ve already verified the STL vector storing the data has the correct data in it. I’ve narrowed the errors down to the glTexSubImage2D call, which looks like this:
glTexSubImage2D(GL_TEXTURE_2D, 0, xoffset, yoffset, width, height, GL_RGB, GL_UNSIGNED_BYTE, edit.data());
I’m trying to update a square of 5x5 texels, so width and height are both 5. The edit.data points to a STL vector of GLubyte values, and has the correct values (all the same). But when I try to paint an orange square, it comes out like this:
There is some of the correct color there, but it’s definitely reading something wrong.
Interestingly, when I change width to 4, it works as expected, aside from only updating 4 texels in the x direction:
I don’t understand why this would be, since the actual data is the same in both directions, and has 25 elements total. glGetError returns GL_NO_ERROR.
In case it’s needed, the code to create the texture:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 256, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, image.data());// All black glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
Any ideas? It seems like a simple thing I’m overlooking, but all the dimensions of all the vectors seem correct.