void GaussianMain::ShowImage(ID3D11DeviceContext* pd3dImmediateContext)
{
// Output to default render target
ID3D11RenderTargetView* rtv_array[1] = {g_pRTV_Default};
pd3dImmediateContext->OMSetRenderTargets(1, rtv_array, g_pDSV_Default);
pd3dImmediateContext->RSSetViewports(1, g_VP_Default);
ID3DX11EffectTechnique* pTech = g_pFX_Render->GetTechniqueByName("Tech_ShowImage");
ID3DX11EffectPass* pPass = g_bColorBlur ? pTech->GetPassByName("Pass_ShowColorImage") : pTech->GetPassByName("Pass_ShowMonoImage");
if (g_bColorBlur)
g_pFX_Render->GetVariableByName("g_texColorInput")->AsShaderResource()->SetResource(g_pSRV_Output);
else
g_pFX_Render->GetVariableByName("g_texMonoInput")->AsShaderResource()->SetResource(g_pSRV_Output);
UINT strides = sizeof(SCREEN_VERTEX);
UINT offsets = 0;
ID3D11Buffer* pBuffers[1] = {g_pScreenQuadVB};
pd3dImmediateContext->IASetInputLayout(g_pQuadLayout);
pd3dImmediateContext->IASetVertexBuffers(0, 1, pBuffers, &strides, &offsets);
pd3dImmediateContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
pPass->Apply(0, pd3dImmediateContext);
pd3dImmediateContext->Draw( 4, 0 );
}
void GaussianMain::ApplyGaussianFilter(ID3D11DeviceContext* pd3dImmediateContext)
{
D3D11_TEXTURE2D_DESC tex_desc;
g_pTex_Scene->GetDesc(&tex_desc);
float box_width = CalculateBoxFilterWidth(g_FilterRadius, g_NumApproxPasses);
float half_box_width = box_width * 0.5f;
float frac_half_box_width = (half_box_width + 0.5f) - (int)(half_box_width + 0.5f);
float inv_frac_half_box_width = 1.0f - frac_half_box_width;
float rcp_box_width = 1.0f / box_width;
// Step 1. Vertical passes: Each thread group handles a colomn in the image
ID3DX11EffectTechnique* pTech = g_pFX_GaussianCol->GetTechniqueByName("Tech_GaussianFilter");
// Input texture
g_pFX_GaussianCol->GetVariableByName("g_texInput")->AsShaderResource()->SetResource(g_pSRV_Scene);
// Output texture
g_pFX_GaussianCol->GetVariableByName("g_rwtOutput")->AsUnorderedAccessView()->SetUnorderedAccessView(g_pUAV_Output);
g_pFX_GaussianCol->GetVariableByName("g_NumApproxPasses")->AsScalar()->SetInt(g_NumApproxPasses - 1);
g_pFX_GaussianCol->GetVariableByName("g_HalfBoxFilterWidth")->AsScalar()->SetFloat(half_box_width);
g_pFX_GaussianCol->GetVariableByName("g_FracHalfBoxFilterWidth")->AsScalar()->SetFloat(frac_half_box_width);
g_pFX_GaussianCol->GetVariableByName("g_InvFracHalfBoxFilterWidth")->AsScalar()->SetFloat(inv_frac_half_box_width);
g_pFX_GaussianCol->GetVariableByName("g_RcpBoxFilterWidth")->AsScalar()->SetFloat(rcp_box_width);
// Select pass
ID3DX11EffectPass* pPass = g_bColorBlur ? pTech->GetPassByName("Pass_GaussianColor") : pTech->GetPassByName("Pass_GaussianMono");
pPass->Apply(0, pd3dImmediateContext);
pd3dImmediateContext->Dispatch(tex_desc.Width, 1, 1);
// Unbound CS resource and output
ID3D11ShaderResourceView* srv_array[] = {NULL, NULL, NULL, NULL};
pd3dImmediateContext->CSSetShaderResources(0, 4, srv_array);
ID3D11UnorderedAccessView* uav_array[] = {NULL, NULL, NULL, NULL};
pd3dImmediateContext->CSSetUnorderedAccessViews(0, 4, uav_array, NULL);
// Step 2. Horizontal passes: Each thread group handles a row in the image
pTech = g_pFX_GaussianRow->GetTechniqueByName("Tech_GaussianFilter");
// Input texture
g_pFX_GaussianRow->GetVariableByName("g_texInput")->AsShaderResource()->SetResource(g_pSRV_Scene);
// Output texture
g_pFX_GaussianRow->GetVariableByName("g_rwtOutput")->AsUnorderedAccessView()->SetUnorderedAccessView(g_pUAV_Output);
g_pFX_GaussianRow->GetVariableByName("g_NumApproxPasses")->AsScalar()->SetInt(g_NumApproxPasses - 1);
g_pFX_GaussianRow->GetVariableByName("g_HalfBoxFilterWidth")->AsScalar()->SetFloat(half_box_width);
g_pFX_GaussianRow->GetVariableByName("g_FracHalfBoxFilterWidth")->AsScalar()->SetFloat(frac_half_box_width);
g_pFX_GaussianRow->GetVariableByName("g_InvFracHalfBoxFilterWidth")->AsScalar()->SetFloat(inv_frac_half_box_width);
g_pFX_GaussianRow->GetVariableByName("g_RcpBoxFilterWidth")->AsScalar()->SetFloat(rcp_box_width);
// Select pass
pPass = g_bColorBlur ? pTech->GetPassByName("Pass_GaussianColor") : pTech->GetPassByName("Pass_GaussianMono");
pPass->Apply(0, pd3dImmediateContext);
pd3dImmediateContext->Dispatch(tex_desc.Height, 1, 1);
// Unbound CS resource and output
pd3dImmediateContext->CSSetShaderResources(0, 4, srv_array);
pd3dImmediateContext->CSSetUnorderedAccessViews(0, 4, uav_array, NULL);
}
