Bloom.OnRenderImage C# (CSharp) Method

    void OnRenderImage(RenderTexture src, RenderTexture dest)
    {
        if (material != null) {
            material.SetFloat("_LuminanceThreshold", luminanceThreshold);

            int rtW = src.width/downSample;
            int rtH = src.height/downSample;

            RenderTexture buffer0 = RenderTexture.GetTemporary(rtW, rtH, 0);
            buffer0.filterMode = FilterMode.Bilinear;

            Graphics.Blit(src, buffer0, material, 0);

            for (int i = 0; i < iterations; i++) {
                material.SetFloat("_BlurSize", 1.0f + i * blurSpread);

                RenderTexture buffer1 = RenderTexture.GetTemporary(rtW, rtH, 0);

                // Render the vertical pass
                Graphics.Blit(buffer0, buffer1, material, 1);

                RenderTexture.ReleaseTemporary(buffer0);
                buffer0 = buffer1;
                buffer1 = RenderTexture.GetTemporary(rtW, rtH, 0);

                // Render the horizontal pass
                Graphics.Blit(buffer0, buffer1, material, 2);

                RenderTexture.ReleaseTemporary(buffer0);
                buffer0 = buffer1;
            }

            material.SetTexture ("_Bloom", buffer0);
            Graphics.Blit (src, dest, material, 3);

            RenderTexture.ReleaseTemporary(buffer0);
        } else {
            Graphics.Blit(src, dest);
        }
    }