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Transfer function GUI for GLFW3

Graphical user interface for transfer function used in volume rendering, originally created by Luiyit Hernandez. Now the interface works with OpenGL 4.5, using shaders.

Usage

In TransferFunction.h include glfw3 and glm header files. In TransferFunction.cpp edit the way to load the textures in the initContext method, in this case was used a textured manager class not included in the repository. There is also a not included singleton class for displaying a unitary quad in the screen.

In the program initialization:

TransferFunction *g_pTransferFunc = new TransferFunction();   
g_pTransferFunc->InitContext(GLFWwindow *window, int *windowsW, int *windowsH, int posx, int posy);

In the glfw3 callback function MouseButton:

double x, y;   
glfwGetCursorPos(g_pWindow, &x, &y);   
// This method returns a bool depending on whether an event is captured or not
g_pTransferFunc->MouseButton(x, y, button, action); 

In the glfw3 callback function CursorPos:

// This method returns a bool depending on whether an event is captured or not
g_pTransferFunc->CursorPos(x, y); 

In the display function:

g_pTransferFunc->Display();

In the main loop:

// Check if the color palette changed
if(g_pTransferFunc->NeedUpdate())    
	UpdatePallete();
// Update the color palette
g_pTransferFunc->SetUpdate(false);

Finally, the texture can be bound to an active texture unit with:

// Check if the color palette changed
g_pTransferFunc->Use(GL_TEXTURE0);

Some functions have been added to load transfer functions from a file and to save the actual transfer function in a file.

Click here to see the general characteristics of this GUI in a video.

Feedback

Pull requests, feature ideas and bug reports are welcome.

License

MIT.