Direct3D11只渲染线条，而且顺序很奇怪

我已经将以前的格式转换问题简化为核心问题。

我有一个顶点缓冲区，由4个顶点组成，排列在一个平面中(标记为0到3)：

1.  .2
0.  .3

以及相应索引缓冲器CCD_ 3。

现在，当我用D3D11_PRIMITIVE_TOPOLOGY_LINESTRIP渲染时，我实现了预期的图像：

__ 
|  |
|__|

然而，当我用D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP渲染时，结果是：

| /|
|/ |

请注意，不执行三角形填充。

更令人困惑的是，当使用D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST时，结果是：

|
|

如果我将索引缓冲区更改为{0,1,2,0,2,3}，它将呈现：

| /
|/

也就是说，在前两个顶点之间只绘制一条像素线。

我已经将着色器简化为最原始的示例：

顶点着色器：

struct VertexInputType
{
float4 position : POSITION;
};
struct PixelInputType
{
float4 position : SV_POSITION;
};
PixelInputType VertexShader(VertexInputType input)
{
PixelInputType output;
input.position.w = 1.0f;
output.position = input.position;
return output;
}

像素着色器：

struct PixelInputType
{
float4 position : SV_POSITION;
};
float4 PixelShader(PixelInputType input) : SV_TARGET
{
float4 color;
color.r = 0;
color.g = 0;
color.b = 0;
color.a = 1;
return color;
}

作为顶点，我使用DirectX::XMFLOAT3:

D3D11_INPUT_ELEMENT_DESC polygon_layout[1];
polygon_layout[0].SemanticName = "POSITION";
polygon_layout[0].SemanticIndex = 0;
polygon_layout[0].Format = DXGI_FORMAT_R32G32B32_FLOAT;
polygon_layout[0].InputSlot = 0;
polygon_layout[0].AlignedByteOffset = 0;
polygon_layout[0].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
polygon_layout[0].InstanceDataStepRate = 0;
d3d11_device->CreateInputLayout(polygon_layout, 1, compiled_vshader_buffer->GetBufferPointer(), compiled_vshader_buffer->GetBufferSize(), &input_layout);

D3D11_BUFFER_DESC vertex_buffer_desc;
vertex_buffer_desc.Usage = D3D11_USAGE_DEFAULT;
vertex_buffer_desc.ByteWidth = sizeof(DirectX::XMFLOAT3) * 4;
vertex_buffer_desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vertex_buffer_desc.CPUAccessFlags = 0;
vertex_buffer_desc.MiscFlags = 0;
vertex_buffer_desc.StructureByteStride = 0;
DirectX::XMFLOAT3 vertices[4];
vertices[0].x = -0.5;    vertices[0].y = -0.5;    vertices[0].z = 0;
vertices[1].x = -0.5;    vertices[1].y =  0.5;    vertices[1].z = 0;
vertices[2].x =  0.5;    vertices[2].y =  0.5;    vertices[2].z = 0;
vertices[3].x =  0.5;    vertices[3].y = -0.5;    vertices[3].z = 0; 
D3D11_SUBRESOURCE_DATA vertex_buffer_data;
vertex_buffer_data.pSysMem = vertices;
vertex_buffer_data.SysMemPitch = 0;
vertex_buffer_data.SysMemSlicePitch = 0;
hr = d3d11_device->CreateBuffer(&vertex_buffer_desc, &vertex_buffer_data, &vertex_buffer);
D3D11_BUFFER_DESC index_buffer_desc;
index_buffer_desc.Usage = D3D11_USAGE_DEFAULT;
index_buffer_desc.ByteWidth = sizeof(int32_t) *  6;
index_buffer_desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
index_buffer_desc.CPUAccessFlags = 0;
index_buffer_desc.MiscFlags = 0;
index_buffer_desc.StructureByteStride = 0;
int32_t indices[6];
indices[0] = 0;
indices[1] = 1;
indices[2] = 2;
indices[3] = 2;
indices[4] = 3;
indices[5] = 0;
D3D11_SUBRESOURCE_DATA index_buffer_data;
index_buffer_data.pSysMem = indices;
index_buffer_data.SysMemPitch = 0;
index_buffer_data.SysMemSlicePitch = 0;
hr = d3d11_device->CreateBuffer(&index_buffer_desc, &index_buffer_data, &index_buffer);
// during rendering I set:
unsigned int stride = sizeof(DirectX::XMFLOAT3);
unsigned int offset = 0;
d3d11_context->IASetVertexBuffers(0, 1, &vertex_buffer, &stride, &offset);
d3d11_context->IASetIndexBuffer(index_buffer, DXGI_FORMAT_R32_UINT, 0);
d3d11_context->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
d3d11_context->RSSetState(rasterizer_state);
d3d11_context->IASetInputLayout(input_layout);
d3d11_context->VSSetShader(vertex_shader, NULL, 0);
d3d11_context->PSSetShader(pixel_shader,  NULL, 0);
// and render with:
d3d11_context->DrawIndexed(6, 0, 0);

当我使用ID3D11ShaderReflection::GetGSInputPrimitive()查看着色器时，我会收到顶点着色器和像素着色器的D3D_PRIMITIVE_UNDEFINED。

我正在用D3D11_FILL_SOLID和D3D11_CULL_NONE设置光栅化器阶段。

D3D11上下文中是否有任何设置或状态可以解释这种行为？我很高兴有任何想法可以去哪里看。提前感谢！