SDL_DrawGPUPrimitives - Man Page

#include <SDL3/SDL_gpu.h>

void SDL_DrawGPUPrimitives(
    SDL_GPURenderPass *render_pass,
    Uint32 num_vertices,
    Uint32 num_instances,
    Uint32 first_vertex,
    Uint32 first_instance);

You must not call this function before binding a graphics pipeline.

Note that the first_vertex and first_instance parameters are NOT compatible with built-in vertex/instance ID variables in shaders (for example, SV_VertexID); GPU APIs and shader languages do not define these built-in variables consistently, so if your shader depends on them, the only way to keep behavior consistent and portable is to always pass 0 for the correlating parameter in the draw calls.

render_pass

a render pass handle.

num_vertices

the number of vertices to draw.

num_instances

the number of instances that will be drawn.

first_vertex

the index of the first vertex to draw.

first_instance

the ID of the first instance to draw.

This function is available since SDL 3.2.0.