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I have been trying to get a complete answer to this for a long time and I know it is complex.
For example lets say we wanted to produce the character 'H' on the screen. H is 72 in ascii or 48 in Hex and 00010010 in binary. Lets say that each side of H is 2 pixels wide and 10 pixels high and the middle line of H is 2x5 px.
We start with cout << "H";
The compiler then produces equivalent assembly code and the operating system/drivers load the program.
So what exact steps happen next. I have read some about registers, ALU units, Microcode.
Is a byte of memory set to 00010010. If so how does the CPU know how to take this byte and inform the GPU that it wants a set of pixels to be written to the screen at a certain area.
Is there some kind of lookup table hard coded into the electronics here or how does it work at the lowest levels.
user3333072
Posted 2014-04-03T14:21:13.120
Reputation: 109
If you want to write something to the screen you would communicate directly with the GPU normally through DirectX, OpenGL. Your question shows a lack of research on the subject. – Ramhound – 2014-04-03T14:34:56.183
I know about GL and DX. Yes I can display on the screen using these graphics libraries, I want to know on a more fundamental basis both software and electronic. – user3333072 – 2014-04-03T14:47:18.490
Look into how GPU drivers work. This question is slightly nonsense since the example code isn't even communicating with the GPU directly. – Ramhound – 2014-04-04T03:01:28.180