顶点不渲染 - DirectX

Question

我正在学习 DirectX 并试图确保在继续创建索引缓冲区之前了解函数的作用（这就是为什么我使用重复的顶点而不是特定的索引）。我正在尝试渲染一个正方形，但我只显示一个三角形。我确信这是我对绕组顺序的误解或在传递给着色器时抵消了值，但我找不到问题所在。下面是当前的相关代码和运行时的结果。

void RenderFrame(void) {

// Clear BackBuffer to a color
devContext->ClearRenderTargetView(backbuffer, D3DXCOLOR(0.0f, 0.2f, 0.4f, 1.0f));

// select which vertex buffer to display
UINT stride = sizeof(Vertex);
UINT offset = 0;
devContext->IASetVertexBuffers(0, 1, &pVBuffer, &stride, &offset);

// select which primtive type we are using
devContext->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELST);

// draw the vertex buffer to the back buffer
devContext->Draw(6, 0);

// swap buffers
swapchain->Present(0, 0);
}

void ParseGraphics() {

// Create a triangle with the Vertex Struct
Vertex square[] =
{
    { 0.2f, 0.5f, 0.5f, D3DXCOLOR(0.0f, 0.0f, 1.0f, 1.0f) }, //top-right
    { 0.2f, -0.5f, 0.5f, D3DXCOLOR(0.0f, 0.0f, 0.0f, 1.0f) }, //bottom-right
    { -0.2f, -0.5f, 0.5f, D3DXCOLOR(1.0f, 0.0f, 0.0f, 1.0f) }, //bottom-left
    { 0.2f, -0.5f, 0.5f, D3DXCOLOR(0.0f, 0.0f, 0.0f, 1.0f) }, //bottom-right
    { -0.2f, -0.5f, 0.5f, D3DXCOLOR(1.0f, 0.0f, 0.0f, 1.0f) }, //bottom-left
    { -0.2f, 0.5f, 0.5f, D3DXCOLOR(0.0f, 1.0f, 0.0f, 1.0f) }, //top-left


};

// Create Vertex Buffer
D3D11_BUFFER_DESC bd;
ZeroMemory(&bd, sizeof(bd));

bd.Usage = D3D11_USAGE_DYNAMIC;
bd.ByteWidth = sizeof(Vertex) * 6;
bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bd.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;

dev->CreateBuffer(&bd, NULL, &pVBuffer);

// copy vertices into buffer
D3D11_MAPPED_SUBRESOURCE msr;
devContext->Map(pVBuffer, NULL, D3D11_MAP_WRITE_DISCARD, NULL, &msr);
memcpy(msr.pData, square, sizeof(square));
devContext->Unmap(pVBuffer, NULL);

}

void BuildPipeline() {
// Load and Compile Shaders
ID3D10Blob *VS, *PS;
D3DX11CompileFromFile(L"shaders.shader", 0, 0, "VShader", "vs_5_0", 0, 0, 0, &VS, 0, 0);
D3DX11CompileFromFile(L"shaders.shader", 0, 0, "PShader", "ps_5_0", 0, 0, 0, &PS, 0, 0);

// Create shaders from the data in the Blobs Buffer
dev->CreateVertexShader(VS->GetBufferPointer(), VS->GetBufferSize(), NULL, &pVS);
dev->CreatePixelShader(PS->GetBufferPointer(), PS->GetBufferSize(), NULL, &pPS);

// Apply Shaders to the device context
devContext->VSSetShader(pVS, 0, 0);
devContext->PSSetShader(pPS, 0, 0);

// Define the layout of the input given to the shaders
D3D11_INPUT_ELEMENT_DESC ied[] =
{
    {"POSITION", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0},
    {"COLOR", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 24, D3D11_INPUT_PER_VERTEX_DATA, 0},

};

dev->CreateInputLayout(ied, 2, VS->GetBufferPointer(), VS->GetBufferSize(), &pLayout);
devContext->IASetInputLayout(pLayout);

}

Answer 1

对于拓扑，您指定D3D10_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP，因此顶点数据预计会形成一个triangle strip。但是，您提供的数据指定了两个单独的三角形（即 三角形列表 ），因此您可能应该使用

devContext->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);

根本错误似乎在 Draw() 调用中：您指定要绘制总共 3 个顶点，而实际上您想要从缓冲区中绘制所有 6 个顶点。即

devContext->Draw(6, 0);

您的 Color 元素描述的字节偏移量也有误。该位置采用 3 个单精度浮点数（3*4 = 12 个字节），紧跟在颜色数据之后。

{"COLOR", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0},

Answer 2

{"POSITION", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0}

应该是 DXGI_FORMAT_R32G32B32_FLOAT，因为该职位只有三个成员。 AlignedByteOffset 可以设置为 12 (4x3)。

顶点不渲染 - DirectX

Vertices not rendering - DirectX

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