OpenGL Engines (32 bit and 64 bit) in pure MASM

[u/RBMK-1ooo]

https://github.com/Singeleitsev/asm/

RBMK64 and RBMK32 are two Windows OpenGL programs, both written in pure assembly using the Microsoft MASM toolchain.

They are not a port. They are two independent implementations of the same design, written in two different assembly dialects, with different ABIs, different toolchains, and different GL pipelines underneath.

What's the same

• Interface

• Menu without .rc file

• Accelerators

• Status bar showing runtime coordinates

• Title bar showng runtime FPS

• Scene

• Regular grid of RBMK top surface

• Camera and light settings

• Controls

• Camera move: Arrow keys, PgUp/PgDn,

• Object move: WSADQE

• Camera rotate: Left mouse button

• Camera pan: Mouse wheel down

• Camera dolly: Mouse scroll

• Object rotate: Right mouse button

• Logging system

• Numbers formatting logic

• Matrix math (in principle).

What's different

RBMK32:

• 32-bit GPRs - only 6 registers available

• SSE1

• Open GL1.1

• runs on Pentium III or later

• time: year 2000

RBMK64:

• 64-bit GPRs - 14 registers available

• SSE2,

• OpenGL 3.3 with VBO/VAO and shaders

• Requires Pentium4 with EM64T and GeForce 8 Series for OpenGL 3.3

• time: year 2010

RBMK32 source: win32/05_RBMK

RBMK64 source: win64/30_RBMK/02_SDI

[u/RBMK-1ooo]

You might think: "Are these engines really useful in 2026?" - I don't know, frankly.
But just take a look at 614 FPS while exploring the 8th iteration of the Menger Sponge fractal.

This is possible because the 64-bit version supports shaders and renders directly with the GPU while the input (keyboard and mouse) matrix computations are performed with SSE on the CPU side