Function SDL_DrawGPUIndexedPrimitives 

pub unsafe extern "C" fn SDL_DrawGPUIndexedPrimitives(
    render_pass: *mut SDL_GPURenderPass,
    num_indices: Uint32,
    num_instances: Uint32,
    first_index: Uint32,
    vertex_offset: Sint32,
    first_instance: Uint32,
)

Draws data using bound graphics state with an index buffer and instancing enabled.

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.

Parameters

• render_pass: a render pass handle.
• num_indices: the number of indices to draw per instance.
• num_instances: the number of instances to draw.
• first_index: the starting index within the index buffer.
• vertex_offset: value added to vertex index before indexing into the vertex buffer.
• first_instance: the ID of the first instance to draw.

Availability

This function is available since SDL 3.2.0.