em 0.1.3

A language/procedural macro for programming GPUs

a picture of a real-world emu

Emu is a high-level language for programming GPUs. Unlike other languages such as OpenCL or Halide that are designed for embedding in C or C++, Emu is designed for embedding in Rust. It provides a single procedural macro for writing functions. The macro translates the functions at compile time into lower-level code so that they can be run on the GPU.

Emu also provides several features that aim to make programming GPUs more accessible such as built-in mathematical and physical constants, unit annotation and implicit conversion. Here are some example functions...

emu! {
	// more particles
	more_particles(num_particles u32, num_moles u32) u32 {
		return num_particles + num_moles * L;

	// moves particles
	move_particles(global_particles_x [f32], global_particles_y f32, global_particles_z f32) {
		global_particles_z[get_global_id(0)] += 7.3e1 as nm;
		global_particles_x[get_global_id(0)] += 2 as cm;
		global_particles_y[get_global_id(0)] += 6 as cm;
	// moves particles in circle
	rotate_particles(global_particles_r [f32]) {
		global_particles_r[get_global_id(0)] += 7.5 * TAU;

	// multiplies 2 matrices
	// n is the dimension of the matrices
	// a and b are the matrices to be multiplied, c is the result
	multiply_matrices(n i32, global_a [f32], global_b [f32], global_c [f32]) {
		// indices of cells to multiply
		let i: i32 = get_global_id(0);
		let j: i32 = get_global_id(1);

		// execute step of multiplication
		for k in 0..n {
			global_c[i * n + j] += global_a[i * n + k] * global_b[k * n + j];

To get started programming GPUs with Emu, check out the book, the examples, and the crate itself.