This indicates that shader will be included in link operations that will * be performed on program. glAttachShader attaches the * shader object specified by shader to the program object specified by program. Shaders that are to be linked together in a program object must first be attached to that program object. Program objects provide * this mechanism. * * In order to create a complete shader program, there must be a way to specify the list of things that will be linked together. OpenGL can be very difficult to get used to but once you start seeing the big picture then you realize that things work in very similar ways, is it a shader program or a framebuffer object./** * Attaches a shader object to a program object. Just read the OpenGL wiki articles about shaders, if you know Java and just learn a bit about the LWJGL 3.x functions then you'll be fine. You can now activate/deactivate it if you wish in your program. So ultimately it represents the shader program.ĭone. Puts the final shader program's reference to a public static map LOADED_SHADERS, key being shader program's name that I first input in the constructor and value being an instance of my ShaderData.java class for this shader program, it contains some information opengl generated for this very program during the compilation process and so on and can be used to later activate this shader program, etc. Gets information about all active uniform variables in the program and puts them in a map structure that can later be used to link java-side objects to shader program variables. Links the shaders to the single shader program Parses the files, I've written some simple preprocessor directive support to #include other shader files in shader files, it's just a recursive thing that calls the parser again when it hits this simple directive, loads it and unwraps the result as a string in the currently-to-be-parsed shader program string Loads up any available shader files with the name I provided What my little game engine does when I ask it to load a shader program Also a class like this can somewhat automate the process, you have 3 shaders that make up a shader program, and this class can just take one single filename in the constructor as parameter and then it can just assume that all the other shaders must have the same filename but just different extension or prefix, or something like that.
So my Shader class can just load up a shader program, which consists of an optional geometry shader and mandatory vertex and fragment shaders. But in my opinion implementing a class that represents a shader program is a decent way to go, that's what I do in my 3D game engine. You don't even need a class, like you can just write some basic shaders and load/compile/link/attach them with functions LWJGL provides. How do you implement a shader in a class? And once you have a somewhat functional shader system in your program you start seeing why they can be incredibly powerful and very nice to use. You pass your transformation/projection matrices to the vertex shader and then do the final transform/projection of vertices to the screen there, etc. So shaders are essential, if you want to create an application that uses OpenGL in at least somewhat modern-way. Well, you can output some basic graphics without shaders, but that would require the use of deprecated very old OpenGL functionality.
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