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AlzPatz

Member Since 29 Sep 2012
Offline Last Active Nov 13 2014 06:53 AM

Topics I've Started

Where is my triangle? Issue moving to Directx 11 and Metro

29 September 2012 - 08:57 AM

Hi. After playing about in directx and metro, I've hit a wall that either I'm being the most useless n00b on the planet or things do not work quite the same as earlier directx. very simply, im trying to render a triangle straight to "normalised / homogenous" or whatever you call it space - using the world's most basic shaders. To make sure that my initialisation code wasn't screwed up, I've transplanted the code into the direct 3D app template and still it does not show. if anyone could help work out why my triangle is not showing, would be appreciated. there must be something easy I've missed. To note this code tries to draw two triangles, filling the screen, one clockwise winding and one anti-clockwise, a test in case my winding was wrong. (Why can't I hit enter on this forum for a new line lol??). Anyway, first I hijack the cuberenders create device resources code
[source lang="cpp"]void CubeRenderer::CreateDeviceResources(){ Direct3DBase::CreateDeviceResources(); VertexPos vertices[] = {  DirectX::XMFLOAT3(0.0f, 0.0f, 0.2f),  DirectX::XMFLOAT3(1.0f, 0.0f, 0.2f),  DirectX::XMFLOAT3(0.0f, 1.0f, 0.2f),  DirectX::XMFLOAT3(0.0f, 1.0f, 0.2f),  DirectX::XMFLOAT3(1.0f, 1.0f, 0.2f),  DirectX::XMFLOAT3(1.0f, 0.0f, 0.2f), }; D3D11_BUFFER_DESC TT_vertexDesc; ZeroMemory(&TT_vertexDesc, sizeof(TT_vertexDesc)); TT_vertexDesc.Usage = D3D11_USAGE_DEFAULT; TT_vertexDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER; TT_vertexDesc.ByteWidth = sizeof(VertexPos) * 6; D3D11_SUBRESOURCE_DATA sResource; ZeroMemory(&sResource, sizeof(sResource)); sResource.pSysMem = vertices; DX::ThrowIfFailed(m_d3dDevice->CreateBuffer(&TT_vertexDesc, &sResource, &TT_vertexBuffer)); //Load the Shaders //Load the vertex shader (the build configuration / properties of the shader file deals with compile to .cso) auto task_LoadTTVS = DX::ReadDataAsync("VS_TriangleTest.cso"); auto task_CreateTTVS = task_LoadTTVS.then([this](DX::ByteArray ba) {  //This async load / helper classes are taken straight from the template. Why not.  auto bc_VS = ba.data;  DX::ThrowIfFailed(m_d3dDevice->CreateVertexShader(bc_VS->Data, bc_VS->Length, nullptr, &VS_TT));  //Create Input Layout Description  D3D11_INPUT_ELEMENT_DESC vertexLayout[] =  {   {"POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0}  };  //Create the Input Layout  DX::ThrowIfFailed(m_d3dDevice->CreateInputLayout(vertexLayout, ARRAYSIZE(vertexLayout), bc_VS->Data, bc_VS->Length, &TT_inputLayout)); }); //Load the pixel shader (again, the build and configuration properties of the shader file deal with compilation auto task_LoadTTPS = DX::ReadDataAsync("PS_TriangleTest.cso"); auto task_CreateTTPS = task_LoadTTPS.then([this](DX::ByteArray ba) {  auto bc_PS = ba.data;  DX::ThrowIfFailed(m_d3dDevice->CreatePixelShader(bc_PS->Data, bc_PS->Length, nullptr, &PS_TT));  m_loadingComplete = true; //dont really work properly as earlier shaders might take longer but meh won't be the issue here });}[/source] THen I hijack the rendering bit. FYI I've confirmed that all the context calls are run
const float Red[] = { 1.0f, 0.0f, 0.0f, 1.0f };
m_d3dContext->ClearRenderTargetView(m_renderTargetView.Get(), Red);
//Clear the depth stenicl view
m_d3dContext->ClearDepthStencilView(m_depthStencilView.Get(), D3D11_CLEAR_DEPTH, 1.0f, 0);
if (!m_loadingComplete)
  return;
m_d3dContext->IASetInputLayout(TT_inputLayout.Get());
m_d3dContext->OMSetRenderTargets(1, m_renderTargetView.GetAddressOf(), m_depthStencilView.Get());
//Test triangle following some book code to check that everything is working
UINT str = sizeof(VertexPos);
UINT oset = 0;
m_d3dContext->IASetVertexBuffers(0, 1, &TT_vertexBuffer, &str, &oset);
m_d3dContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
m_d3dContext->VSSetShader(VS_TT.Get(), 0, 0);
m_d3dContext->PSSetShader(PS_TT.Get(), 0, 0);
m_d3dContext->Draw(6, 0);
then the world's simplest shaders (even desperately rewritten to copy ones on the net using a structure, obviously this pass through could just be main function only returning float4...
struct VOut
{
float4 position : SV_POSITION;
};
VOut main( float4 pos : POSITION )
{
VOut output;
output.position = pos;
return output;
}
and the pixel pencil...
float4 main(float4 position : SV_POSITION) : SV_TARGET
{
return float4 (0.0f, 1.0f, 1.0f, 1.0f);
}
and wahay, I always get a red screen. ive tried making the triangles screen sized in case its not -1,-1 to 1,1 but still no joy. any help for a tired n00b? thanks!!

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