# SDL_GPUIndirectDrawCommand

A structure specifying the parameters of an indirect draw command.

## Header File

Defined in [<SDL3/SDL_gpu.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_gpu.h)

## Syntax

```c
typedef struct SDL_GPUIndirectDrawCommand
{
    Uint32 num_vertices;   /**< The number of vertices to draw. */
    Uint32 num_instances;  /**< The number of instances to draw. */
    Uint32 first_vertex;   /**< The index of the first vertex to draw. */
    Uint32 first_instance; /**< The ID of the first instance to draw. */
} SDL_GPUIndirectDrawCommand;
```

## Remarks

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.

## Version

This struct is available since SDL 3.2.0.

## See Also

- [SDL_DrawGPUPrimitivesIndirect](SDL_DrawGPUPrimitivesIndirect)

----
[CategoryAPI](CategoryAPI), [CategoryAPIStruct](CategoryAPIStruct), [CategoryGPU](CategoryGPU)

