The activated shader program's shaders will be used when we issue render calls. We then define the position, rotation axis, scale and how many degrees to rotate about the rotation axis. Our glm library will come in very handy for this. If compilation failed, we should retrieve the error message with glGetShaderInfoLog and print the error message. . We are now using this macro to figure out what text to insert for the shader version. OpenGL is a 3D graphics library so all coordinates that we specify in OpenGL are in 3D ( x, y and z coordinate). Specifies the size in bytes of the buffer object's new data store. OpenGL has no idea what an ast::Mesh object is - in fact its really just an abstraction for our own benefit for describing 3D geometry. You could write multiple shaders for different OpenGL versions but frankly I cant be bothered for the same reasons I explained in part 1 of this series around not explicitly supporting OpenGL ES3 due to only a narrow gap between hardware that can run OpenGL and hardware that can run Vulkan. For a single colored triangle, simply . We now have a pipeline and an OpenGL mesh - what else could we possibly need to render this thing?? Our fragment shader will use the gl_FragColor built in property to express what display colour the pixel should have. #if TARGET_OS_IPHONE OpenGL is a 3D graphics library so all coordinates that we specify in OpenGL are in 3D (x, y and z coordinate). Open it in Visual Studio Code. . Well call this new class OpenGLPipeline. A vertex array object (also known as VAO) can be bound just like a vertex buffer object and any subsequent vertex attribute calls from that point on will be stored inside the VAO. In our rendering code, we will need to populate the mvp uniform with a value which will come from the current transformation of the mesh we are rendering, combined with the properties of the camera which we will create a little later in this article. The glm library then does most of the dirty work for us, by using the glm::perspective function, along with a field of view of 60 degrees expressed as radians. You should also remove the #include "../../core/graphics-wrapper.hpp" line from the cpp file, as we shifted it into the header file. The triangle above consists of 3 vertices positioned at (0,0.5), (0. . Without a camera - specifically for us a perspective camera, we wont be able to model how to view our 3D world - it is responsible for providing the view and projection parts of the model, view, projection matrix that you may recall is needed in our default shader (uniform mat4 mvp;).

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