How do I properly render depth info in a separate pass for Shadow Maps in D3D11?

Question

So I wanted to implement shadows in my D3D11 renderer. However, the Debug Layer gives me the warning

D3D11 WARNING: ID3D11DeviceContext::OMSetRenderTargets: Resource being set to OM DepthStencil is still bound on input! [ STATE_SETTING WARNING #9: DEVICE_OMSETRENDERTARGETS_HAZARD]
D3D11 WARNING: ID3D11DeviceContext::OMSetRenderTargets[AndUnorderedAccessViews]: Forcing PS shader resource slot 1 to NULL. [ STATE_SETTING WARNING #7: DEVICE_PSSETSHADERRESOURCES_HAZARD]
D3D11 WARNING: ID3D11DeviceContext::DrawIndexed: The Pixel Shader unit expects a Sampler to be set at Slot 1, but none is bound. This is perfectly valid, as a NULL Sampler maps to default Sampler state. However, the developer may not want to rely on the defaults.  [ EXECUTION WARNING #352: DEVICE_DRAW_SAMPLER_NOT_SET]
D3D11 WARNING: ID3D11DeviceContext::DrawIndexed: The Pixel Shader unit expects a Sampler to be set at Slot 1, but none is bound. This is perfectly valid, as a NULL Sampler maps to default Sampler state. However, the developer may not want to rely on the defaults.  [ EXECUTION WARNING #352: DEVICE_DRAW_SAMPLER_NOT_SET]

The relevant code is below :

void AppWindow::renderShadowMap()
{
    //GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->unbindSRV();
    //CLEAR THE RENDER TARGET AND DEPTH STENCIL
    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->clearRenderTargetColor(shadow_map_rtv, 1.0, 1.0f, 1.0f, 1);
    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->clearDepthStencil(shadow_map_dsv);
    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->SetRenderTarget(shadow_map_rtv, shadow_map_dsv);
    //SET VIEWPORT OF RENDER TARGET IN WHICH WE HAVE TO DRAW
    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->setViewportSize(1920, 1080);

    lightViewMatrix = Matrix4x4::lookAt(Vector3D(2,2,0), Vector3D(0, 0, 0), Vector3D(0, 1, 0));
    lightProjectionMatrix.setOrthoProj(20, 20, 1.0f, 10.0f);
    lightSpaceMatrix = lightProjectionMatrix;
    lightSpaceMatrix *= lightViewMatrix;

    updateModel(Vector3D(0, 0, 0), MAT_shadow_map);
    SM_mesh->drawMesh(MAT_shadow_map);

    updateModel(Vector3D(0, -0.5f, 0), MAT_shadow_map);
    SM_plane->drawMesh(MAT_shadow_map);

    SM_sky_mesh->drawMesh(MAT_shadow_map);

    //GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->SetRenderTarget(NULL, NULL);
}

void AppWindow::render()
{
    //CLEAR THE RENDER TARGET 
    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->clearRenderTargetColor(this->m_swap_chain, 0.3f, 0.4f, 0.5f, 1);
    //SET VIEWPORT OF RENDER TARGET IN WHICH WE HAVE TO DRAW
    RECT rc = this->getClientWindowRect();
    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->setViewportSize(rc.right - rc.left, rc.bottom - rc.top);

    update();

    updateModel(Vector3D(0, 0, 0), MAT_mesh);
    SM_mesh->drawMesh(MAT_mesh);

    updateModel(Vector3D(0, -0.5f, 0), MAT_mesh);
    SM_plane->drawMesh(MAT_mesh);

    SM_sky_mesh->drawMesh(MAT_sky);

    m_swap_chain->present(true);

    oldDelta = newDelta;
    newDelta = ::GetTickCount();
    deltaTime = (oldDelta) ? ((newDelta - oldDelta) / 1000.0f) : 0.0f;
    time += deltaTime;

    GraphicsEngine::get()->getRenderSystem()->getImmediateDeviceContext()->unbindSRV();
}

void DeviceContext::unbindSRV()
{
    ID3D11ShaderResourceView* nullSRV[1] = { nullptr };
    m_device_context->PSSetShaderResources(0, 1, nullSRV);
}

I just need to know how and where do I unbind the shadow_map_rtv and shadow_map_dsv as that is what is causing the problem. Cannot find anything similar online.

Well I don't see any samplers bound so that would explain last two error messages. Regarding the first two, what is exactly inside SetRenderTarget of your Context abstraction and why did you uncomment it? — zezanjee

Choi Choi · Accepted Answer · 2021-08-11T19:43:08

I guess your shadow map render pipeline is wrong. First you should set render target to nullptr or NULL. Then create and bind a depth stencil for shadow map. Then clear the depth stencil and render your scene from light view. If you have any camera class in your program, you can create another camera for light. You can use depth stencil output texture as shadow map for shadow mapping shader. All the another stuff like sampler or primitive topology is optional for your rendering pipeline. I'll drop a piece of code.

ID3D11RenderTargetView* rtv[1] = { 0 };
pContext->OMSetRenderTargets(1, rtv, dsShadow->pDepthStencilView.Get());
dsShadow->Clear(pContext.Get());
RenderScene(pDirectLight->GetLightCamera());

How do I properly render depth info in a separate pass for Shadow Maps in D3D11?

1 Answers