C#ゲームエンジンのMultiDrawIndirect対応状況

2026年1月8日の対応

Godot

多分対応してます。

if (p_use_indices) {
    ERR_FAIL_COND_MSG(p_offset + 20 > buffer->size, "Offset provided (+20) is past the end of buffer.");

    draw_graph.add_draw_list_draw_indexed_indirect(buffer->driver_id, p_offset, p_draw_count, p_stride);
} else {
    ERR_FAIL_COND_MSG(p_offset + 16 > buffer->size, "Offset provided (+16) is past the end of buffer.");

    draw_graph.add_draw_list_draw_indirect(buffer->driver_id, p_offset, p_draw_count, p_stride);
}

void RenderingDeviceGraph::add_draw_list_draw_indirect(RDD::BufferID p_buffer, uint32_t p_offset, uint32_t p_draw_count, uint32_t p_stride) {
	DrawListDrawIndirectInstruction *instruction = reinterpret_cast<DrawListDrawIndirectInstruction *>(_allocate_draw_list_instruction(sizeof(DrawListDrawIndirectInstruction)));
	instruction->type = DrawListInstruction::TYPE_DRAW_INDIRECT;
	instruction->buffer = p_buffer;
	instruction->offset = p_offset;
	instruction->draw_count = p_draw_count;
	instruction->stride = p_stride;
	draw_instruction_list.stages.set_flag(RDD::PIPELINE_STAGE_DRAW_INDIRECT_BIT);
}

void RenderingDeviceGraph::add_draw_list_draw_indexed_indirect(RDD::BufferID p_buffer, uint32_t p_offset, uint32_t p_draw_count, uint32_t p_stride) {
	DrawListDrawIndexedIndirectInstruction *instruction = reinterpret_cast<DrawListDrawIndexedIndirectInstruction *>(_allocate_draw_list_instruction(sizeof(DrawListDrawIndexedIndirectInstruction)));
	instruction->type = DrawListInstruction::TYPE_DRAW_INDEXED_INDIRECT;
	instruction->buffer = p_buffer;
	instruction->offset = p_offset;
	instruction->draw_count = p_draw_count;
	instruction->stride = p_stride;
	draw_instruction_list.stages.set_flag(RDD::PIPELINE_STAGE_DRAW_INDIRECT_BIT);
}

未対応

Unity

内部的に複数の命令に分割(https://issuetracker.unity3d.com/issues/graphics-dot-rendermeshindirect-does-not-issue-multi-draw-rendering-commands-when-using-a-graphics-api-capable-of-multi-draw-commands)

Stride3D

Vulkan OpenGLなど未対応(他のは調べてません)
https://github.com/stride3d/stride/blob/7a98919729393d89ef1cca170020e2b4c2006872/sources/engine/Stride.Graphics/Vulkan/CommandList.Vulkan.cs#L635

public void DrawIndexedInstanced(int indexCountPerInstance, int instanceCount, int startIndexLocation = 0, int baseVertexLocation = 0, int startInstanceLocation = 0)
{
    PrepareDraw();

    vkCmdDrawIndexed(currentCommandList.NativeCommandBuffer, (uint) indexCountPerInstance, (uint) instanceCount, (uint) startIndexLocation, baseVertexLocation, (uint) startInstanceLocation);
    //NativeCommandList.DrawIndexedInstanced(indexCountPerInstance, instanceCount, startIndexLocation, baseVertexLocation, startInstanceLocation);

    GraphicsDevice.FrameDrawCalls++;
    GraphicsDevice.FrameTriangleCount += (uint) (indexCountPerInstance * instanceCount);
}

public void DrawIndexedInstanced(Buffer argumentsBuffer, int alignedByteOffsetForArgs = 0)
{
    if (argumentsBuffer == null) throw new ArgumentNullException("argumentsBuffer");

    PrepareDraw();

    throw new NotImplementedException();
    //NativeCommandBuffer.DrawIndirect(argumentsBuffer.NativeBuffer, (ulong) alignedByteOffsetForArgs, );
    //NativeDeviceContext.DrawIndexedInstancedIndirect(argumentsBuffer.NativeBuffer, alignedByteOffsetForArgs);

    GraphicsDevice.FrameDrawCalls++;
}

public void DrawInstanced(int vertexCountPerInstance, int instanceCount, int startVertexLocation = 0, int startInstanceLocation = 0)
{
    PrepareDraw();

    vkCmdDraw(currentCommandList.NativeCommandBuffer, (uint) vertexCountPerInstance, (uint) instanceCount, (uint) startVertexLocation, (uint) startVertexLocation);
    //NativeCommandList.DrawInstanced(vertexCountPerInstance, instanceCount, startVertexLocation, startInstanceLocation);

    GraphicsDevice.FrameDrawCalls++;
    GraphicsDevice.FrameTriangleCount += (uint) (vertexCountPerInstance * instanceCount);
}

public void DrawInstanced(Buffer argumentsBuffer, int alignedByteOffsetForArgs = 0)
{
    if (argumentsBuffer == null) throw new ArgumentNullException("argumentsBuffer");

    PrepareDraw();

    throw new NotImplementedException();
    //NativeDeviceContext.DrawIndexedInstancedIndirect(argumentsBuffer.NativeBuffer, alignedByteOffsetForArgs);

    GraphicsDevice.FrameDrawCalls++;
}