Low-Level Graphics in C – Pixel Manipulation and Frame Buffers

Creating low-level graphics in C on modern operating systems requires an abstraction layer to bypass memory access restrictions, allowing developers to manually write pixel data to a software frame buffer.

• Memory access — Modern operating systems block direct writing to video memory, necessitating an abstraction layer to manipulate screen pixels safely [09:21].
• SDL3 integration — Using a cross-platform library handles the interface between C code and display hardware, removing the need to write unique implementation code for each operating system [14:26].
• Frame buffer architecture — A 1D array serves as the memory mirror for display data, where each array element represents the color value of a single pixel [06:00].
• Coordinate mapping — Converting 2D screen positions (x, y) into the 1D array index relies on the calculation: (width * y) + x [1:10:05].
• Rendering loop — The software loop continuously monitors system inputs, updates the texture memory with the current frame buffer contents, and presents the result [46:27].
• Performance timing — Measuring performance counters against a target delay ensures the render loop stays consistent, preventing frame rates from exceeding 60 FPS [1:13:26].
• Resource cleanup — Explicitly destroying the texture, renderer, and window pointers ensures proper memory release upon program termination [48:41].

How does the frame buffer index calculation change if the screen resolution is altered? What are the performance limitations of CPU-based rendering compared to GPU-accelerated methods?*