bloom_snippets_combined.fx

// Bloom pixel shader snippets (remainder of shaders omitted)
// AJ Weeks 2017

// High pass filter pixel shader
float4 PS(PS_INPUT input) : SV_Target
{
    float3 finalColor = gTexture.Sample(SamPoint, input.TexCoord).rgb;
	
    float brightness = dot(finalColor, float3(0.2126f, 0.7152f, 0.0722f));
	
    if (brightness > gMinBrightness)
    {
        float4 result = float4(finalColor, 1.0f);
        return result;    
    }

    return float4(0, 0, 0, 1);
}

// ...

// Blur pixel shader
float4 PS(PS_INPUT input) : SV_Target
{
    uint width, height, levels;
    gTexture.GetDimensions(0, width, height, levels);

    float dx = 1.0 / width;
    float dy = 1.0 / height;

    float weights[5] = { 0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216 };

    // Start with current fragment's contribution
    float3 finalColor = gTexture.Sample(SamPoint, input.TexCoord).rgb * weights[0];

    // 5 in each direction
    int passes = 5;
    if (gHorizontal)
    {
        for (int i = 1; i < passes; ++i)
            {
                finalColor += gTexture.Sample(SamPoint, input.TexCoord + float2(i * dx, 0.0)).rgb * weights[i];
                finalColor += gTexture.Sample(SamPoint, input.TexCoord - float2(i * dx, 0.0)).rgb * weights[i];
            }
    }
    else
    {
        for (int i = 1; i < passes; ++i)
        {
	    finalColor += gTexture.Sample(SamPoint, input.TexCoord + float2(0.0, i * dy)).rgb * weights[i];
            finalColor += gTexture.Sample(SamPoint, input.TexCoord - float2(0.0, i * dy)).rgb * weights[i];
        }
    }

    float4 result = float4(finalColor, 1.0f);
    return result;
}

// ...

// Combine pixel shader
float4 PS(PS_INPUT input) : SV_Target
{
    float4 original = gTexturePrevious.Sample(SamPoint, input.TexCoord);
    float4 blurredHighPass = gTextureBlurredHighpass.Sample(SamPoint, input.TexCoord);

    return original + lerp(float4(0.0f, 0.0f, 0.0f, 0.0f), blurredHighPass, gStrength);
}