I need help how to split glTexSubImage3D into small parts. Why? Because its more faster than whole image.
My discovery: using small parts ex: 1024*1024 times 1x1 pixel is a lot faster than 1 time 1024x1024.
1 time change looks:
Code :GLfuncs->glTexSubImage3D(type, 0, 0, 0, 0, width, height, layer, GL_RGBA, GL_FLOAT, texels);
Split change using glTexSubImage3D offsets(ofc that code is in two "for" cycles):
Code :GLfuncs->glTexSubImage3D(type, 0, x, y, 0, 1, 1, layer, GL_RGBA, GL_FLOAT, texels);
What's my fault? I see just first pixel of this all(others are 0). So my offset data is somehow wrong, I don't know where can be mistake.
Also this texture is updated per frame. If you have better idea how to do this whole easier or faster give me advice!