sebbbi

Setup:
1. Index buffer containing N quads (each 2 triangles), where N is the max amount of spheres. Repeating pattern of {0,1,2,1,3,2} + K*4.
2. No vertex buffer.

Render N*2 triangles, where N is the number of spheres you have.

Vertex shader:
1. Sphere index = N/4 (N = SV_VertexId)
2. Quad coord: Q = float2(N%2, (N%4)/2) * 2.0 - 1.0
3. Transform sphere center -> pos

NocturnDragon

#include <stdio.h>

// #define CLANG_EXTENSION
// Clang compile with -O3

#define VS_EXTENSION
// https://godbolt.org/z/sVWrF4
// Clang  compile with -O3 -fms-compatibility
// VS2017 compile with /O3