glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textures[0]);
(...)
image1 = SOIL_load_image("res/img1.png", &width, &height, 0, SOIL_LOAD_RGBA);​ //"img2.png" for image2
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,width,height,0,GL_RGBA,GL_UNSIGNED_BYTE,image1);
SOIL_free_image_data(image1);

It’s working, and I can call them by changing between texture. Now I want to use single image from SOIL as an input for my color-processig function, and store the result as texture 1 and 2. 

I created function changed(), using input image (img0) I will do some pixel modification store the results as t1 and t2 (both unsigned char). I want to use t1 as source for texture1, and t2 as source for texture2, so I can call and switch between them later. (the code is pretty long, please let me know if you want me to include them).

I tried to call the the function like this 

//create texture========================================================================
GLuint textures[2];
glGenTextures(2, textures);

image = SOIL_load_image("res/img0.png", &width, &height, 0, SOIL_LOAD_RGBA);
if (image == NULL) exit(0);

image1 = NULL;
image2 = NULL;
changed();

//Texture 1
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textures[0]);
(...)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image1);
SOIL_free_image_data(image1);

//then Texture 2 using image2

But it doesn’t work, no error and no image drawn to the scene.
I checked with changing the clear color buffer value, and the color buffer works.
So it’s the problem with calling the function and passing my image. Any suggestion ?

[UPDATE]

I added error handling code to check, like this :

	while (!(err = glGetError())) {
		cout << "some error message" << err << endl; }

image = SOIL_load_image("res/img0.png", &width, &height, 0, SOIL_LOAD_RGBA);

How do I properly load an image using SOIL as a source for a function ? 
This is the same way I did it with GLUT and it’s working, is it different with GLFW ?

[UPDATE AGAIN]

I replaced error handling with this, and the program is still runing. Not exit, so definitely the image is there.

	if (image == NULL) {
		cout << "Error loading image source." << err << endl;
		exit(0);
	}

cout << width << " x " << height;