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	if( FAILED(D3DCompileFromFile(L"./data/fullQuad.fx", NULL, NULL, "PS", "ps_4_0", dwShaderFlags, 0, &pPSBlob, &pErrorBlob) ) )
	{
		if( pErrorBlob )
		{
			OutputDebugStringA( (char*)pErrorBlob->GetBufferPointer() );
			pErrorBlob->Release();
		}
		return false;
	}

float circle(in float2 _st, in float _radius)
{
    float2 l = _st-float2(0.5,0.5);
    //return 1.f - smoothstep(_radius-(_radius*0.01),_radius+(_radius*0.01), dot(l,l)*4.0);
	return 1.f - step(_radius*_radius, dot(l,l));
}

//--------------------------------------------------------------------------------------
// Pixel Shader: Draw circles 
//--------------------------------------------------------------------------------------
float4 PSCanvas( PS_INPUT input) : SV_Target
{
	float2 resolution = float2(cWidth,cHeight);
	float2 st = input.Pos.xy / resolution;
	float3 color = float3(0.f,0.f,0.f);
	st *= 3.0f;
	st = frac(st); // fract() in glsl
	float v = circle(st, 0.5);
	color = float3(v, v, v); 
    return float4(color,1.0f);
}

// create a smooth transition in sphere edge
return 1.f - smoothstep(_radius-(_radius*0.01),_radius+(_radius*0.01), dot(l,l)*4.0);

 struct  UniformParam 
    {
        virtual void Init(IGHIComputeCommandCotext *commandcontext, GHIBuffer **constBuffer) = 0;
        virtual void Update(const Camera &camera, IGHIComputeCommandCotext *commandcontext, GHIBuffer *constBuffer) = 0;
    };

    struct alignas(16) VSConstants:public UniformParam
    {
        Float4x4 WorldViewProjection;

        virtual void Init(IGHIComputeCommandCotext *commandcontext, GHIBuffer **constBuffer) override
        {
            *constBuffer = commandcontext->CreateConstBuffer(sizeof(VSConstants), nullptr);
        }

        virtual void Update(const Camera &camera, IGHIComputeCommandCotext *commandcontext, GHIBuffer *constBuffer) override
        {
            VSConstants vsParam;
            vsParam.WorldViewProjection = Float4x4::Transpose(camera.ViewProjectionMatrix());
            commandcontext->UpdateBuffer(constBuffer, &vsParam, sizeof(vsParam));
        }
    };