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DX11 Render to Texture and MSAA/Layered Transparency

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Hey guys,


Normally I'd post these as two questions, but I have a feeling they're intertwined. In short, I have a particle system that generates data for a sprite to display on a transparent surface. It's then sent to a geometry shader (through a pass through vertex shader) to extrude a single vertex into quads, then finally to a pixel shader (code below).


The pixel colors are sampled from a 32bit DDS (using an alpha channel to denote transparency) that's being used as a texture atlas (64x64 surfaces).


The two problems are as follows:

  • Although a single sprite honors its transparency properly, when that sprite passes over another one, one of the quads overwrites the other with a transparent rectangle (you can see the attached images: the first image is a frame with them overlapping, the second is after one has moved away slightly).
  • I cannot for, for the life of my, get MSAA to cooperate. I've setup a triple Texture2D system to do an output->ResolveSubresource->output_msaa->CopyResource->final_output, and it renders, it's just still aliased.


Here is the code for the device, texture, and sampler state:

//Errors are checked in other places and the debug layer is showing no warnings

//Render Target Texture
ZeroMemory(&texd, sizeof(texd));
texd.Width = config.width;
texd.Height = config.height;
texd.ArraySize = 1;
texd.SampleDesc.Count = 4;
texd.SampleDesc.Quality = D3D11_CENTER_MULTISAMPLE_PATTERN;
texd.MipLevels = 1;
texd.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
texd.BindFlags = D3D11_BIND_RENDER_TARGET;
texd.Usage = D3D11_USAGE_DEFAULT;
hr = dev->CreateTexture2D(&texd, NULL, &output_texture);

//Sampler State
D3D11_SAMPLER_DESC samplerdesc;
ZeroMemory(&samplerdesc, sizeof(samplerdesc));
samplerdesc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
samplerdesc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
samplerdesc.AddressW = D3D11_TEXTURE_ADDRESS_CLAMP;
samplerdesc.ComparisonFunc = D3D11_COMPARISON_NEVER;
samplerdesc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
samplerdesc.MaxLOD = D3D11_FLOAT32_MAX;	
hr = dev->CreateSamplerState(&samplerdesc, &samplerstate);

//MSAA Intermediary Texture
ZeroMemory(&texd, sizeof(texd));
texd.Height = config.height;
texd.Width = config.width;
texd.MipLevels = 1;
texd.ArraySize = 1;
texd.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
texd.SampleDesc.Count = 1;
texd.SampleDesc.Quality = 0;
texd.Usage = D3D11_USAGE_DEFAULT;		
hr = dev->CreateTexture2D(&texd, NULL, &output_temp_msaa);

//Second Intermediary Texture
ZeroMemory(&texd, sizeof(texd));
texd.Height = config.height;
texd.Width = config.width;
texd.MipLevels = 1;
texd.ArraySize = 1;
texd.Format = DXGI_FORMAT_B8G8R8A8_UNORM;
texd.SampleDesc.Count = 1;
texd.SampleDesc.Quality = 0;
texd.Usage = D3D11_USAGE_STAGING;
texd.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
hr = dev->CreateTexture2D(&texd, NULL, &output_temp);

The texture loading:

hr = D3DX11CreateShaderResourceViewFromFile(

//in the Render() function:
devcon->PSSetShaderResources(0, 1, &res_texture);

The blend state code:

D3D11_BLEND_DESC desc;
desc.AlphaToCoverageEnable = false;
desc.IndependentBlendEnable = false;
for (int i = 0; i < 8; i++)
	desc.RenderTarget[i].BlendEnable = true;
	desc.RenderTarget[i].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
	desc.RenderTarget[i].SrcBlend = D3D11_BLEND_SRC_ALPHA;
	desc.RenderTarget[i].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
	desc.RenderTarget[i].SrcBlendAlpha = D3D11_BLEND_ZERO;
	desc.RenderTarget[i].DestBlendAlpha = D3D11_BLEND_ZERO; 
	desc.RenderTarget[i].BlendOp = D3D11_BLEND_OP_ADD;
	desc.RenderTarget[i].BlendOpAlpha = D3D11_BLEND_OP_ADD;	
hr = dev->CreateBlendState(&desc, &blendstate);

Here is the code that converts from output_texture to the output_temp texture for copying:

    D3D11CalcSubresource(0, 0, 1),
    D3D11CalcSubresource(0, 0, 1),
devcon->CopyResource(output_temp, output_temp_msaa);

This is then used as such:

devcon->Map(output_temp, 0, D3D11_MAP_READ, 0, &output_subresource);

and copied, bit by bit, to another location for drawing.


Here is the current pixel shader:

//These are properly being set, AFAIK.
Texture2D Texture;
SamplerState ss;

struct PS_INPUT {
	float4 p : SV_POSITION;
	float2 t : TEXCOORD;
	float opacity : OPACITY;

float4 PShader(PS_INPUT input) : SV_TARGET
	float4 color = Texture.Sample(ss, input.t);	
	color.a = input.opacity;		
	return color;

Finally, the images showing the transparent clipping are attached (the offending sprite is in the middle of the screen).


Thanks in advance everybody!

Edited by turbofandude

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