Since this function will be used by all other tutorials, it is placed in a separate file : common/loadShader.cpp. It’s not very important to fully understand it, since you often do this only once in a program, so comments should be enough. The extension is irrelevant, it could be. In this example, we have agmentshader and SimpleVertexShader.vertexshader. The two shaders are usually in separate files. Unlike C or Java, GLSL has to be compiled at run time, which means that each and every time you launch your application, all your shaders are recompiled. Shaders are programmed in a language called GLSL : GL Shader Language, which is part of OpenGL. And since we use 4x antialising, we have 4 samples in each pixel. In the simplest possible configuration, you will need two shaders : one called Vertex Shader, which will be executed for each vertex, and one called Fragment Shader, which will be executed for each sample. This is done by using something called shaders. Let’s see how we can improve it by painting it in red. ( Don’t panic if you don’t some systems require a shader to show anything) : If you’re lucky, you can see the result in white. GlDrawArrays ( GL_TRIANGLES, 0, 3 ) // Starting from vertex 0 3 vertices total -> 1 triangle No particular reason for 0, but must match the layout in the shader. GlEnableVertexAttribArray ( 0 ) glBindBuffer ( GL_ARRAY_BUFFER, vertexbuffer ) glVertexAttribPointer ( 0, // attribute 0. So we need three 3D points in order to make a triangle let’s go : On a side note, notice that you can move your hand freely : your X, Y and Z will be moving, too. Having the Z in this direction is weird, so why is it so ? Short answer : because 100 years of Right Hand Rule Math will give you lots of useful tools.

If you put your thumb to the right and your index to the sky, it will point to your back, too.

Z is towards your back (yes, behind, not in front of you)īut here is a better way to visualize this : use the Right Hand Rule.

You can think about these three coordinates in the following way : When talking about “points” in 3D graphics, we usually use the word “vertex” ( “vertices” on the plural ). Screen CoordinatesĪ triangle is defined by three points. If you really want to know more about VAOs, there are a few other tutorials out there, but this is not very important. GLuint VertexArrayID glGenVertexArrays ( 1, & VertexArrayID ) glBindVertexArray ( VertexArrayID ) ĭo this once your window is created (= after the OpenGL Context creation) and before any other OpenGL call.

Java lwjgl gldrawarrays