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Hi, I'm trying to work with multi-texture using SOIL. I think it's a mistake of how I call the texture. I have 2 textures now with 2 different image source (Texture 1 and Texture 2), they look like this :

Texture :
glActiveTexture(GL_TEXTURE0); 
glBindTexture(GL_TEXTURE_2D, textures[0]); 
(...) 

image1 = SOIL_load_image("res/img1.png",&width,&height,0,SOIL_LOAD_RGBA); 
//"res/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); 

image 1 for Texture 1 & image 2 for Texture 2.

It’s working, and I can call them by changing between texture. Now I’m trying to change the image source for texture 1 and texture 2 as the same image (img0).

I created function changed(), using input image (img0) then I will do some pixel modification with img0 and store the results as t1 and t2 (both unsigned char). I want to use t1 as source for texture1, and t2 as the 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).

What I have tried:

I tried to call 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; //(image1 = t1 later in changed() func.)
image2 = NULL; //(image2 = t2 later in changed() func.)
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 with 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; 	
        }

And turn out the error is after my loading source image code :
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);
	}

I also tried to print the width and height of the image, and I got the correct result on the console.
cout << width << " x " << height;

But the image isn’t showing. I only need this image to be input of my function, and later my function will generate 2 image result, I will use it as texture 1 and texture 2. Help ?
Posted
Updated 26-Nov-18 3:43am
v5

1 solution

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Solution 1

When you want to change between the images than it would be easier to have a flag which to use. Any load or reload activity is bad for performance.

Stick to the mantra: startup. load and modify only once with all static data.
   
Comments
Member 13987597 22-Nov-18 8:37am
   
Hi, I can change between texture already.
The problem is different, I want to use the same image to produce different source for each texture.

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