public override void Render()

in unity/Assets/PostProcessingV2/Runtime/Effects/Bloom.cs [92:216]
91 lines of code
15 McCabe index (conditional complexity)

        public override void Render(PostProcessRenderContext context)
        {
            var cmd = context.command;
            cmd.BeginSample("BloomPyramid");

            var sheet = context.propertySheets.Get(context.resources.shaders.bloom);

            // Apply auto exposure adjustment in the prefiltering pass
            sheet.properties.SetTexture(ShaderIDs.AutoExposureTex, context.autoExposureTexture);

            // Negative anamorphic ratio values distort vertically - positive is horizontal
            float ratio = Mathf.Clamp(settings.anamorphicRatio, -1, 1);
            float rw = ratio < 0 ? -ratio : 0f;
            float rh = ratio > 0 ?  ratio : 0f;

            // Do bloom on a half-res buffer, full-res doesn't bring much and kills performances on
            // fillrate limited platforms
            int tw = Mathf.FloorToInt(context.screenWidth / (2f - rw));
            int th = Mathf.FloorToInt(context.screenHeight / (2f - rh));

            // Determine the iteration count
            int s = Mathf.Max(tw, th);
            float logs = Mathf.Log(s, 2f) + Mathf.Min(settings.diffusion.value, 10f) - 10f;
            int logs_i = Mathf.FloorToInt(logs);
            int iterations = Mathf.Clamp(logs_i, 1, k_MaxPyramidSize);
            float sampleScale = 0.5f + logs - logs_i;
            sheet.properties.SetFloat(ShaderIDs.SampleScale, sampleScale);

            // Prefiltering parameters
            float lthresh = Mathf.GammaToLinearSpace(settings.threshold.value);
            float knee = lthresh * settings.softKnee.value + 1e-5f;
            var threshold = new Vector4(lthresh, lthresh - knee, knee * 2f, 0.25f / knee);
            sheet.properties.SetVector(ShaderIDs.Threshold, threshold);

            int qualityOffset = settings.fastMode ? 1 : 0;

            // Downsample
            var lastDown = context.source;
            for (int i = 0; i < iterations; i++)
            {
                int mipDown = m_Pyramid[i].down;
                int mipUp = m_Pyramid[i].up;
                int pass = i == 0
                    ? (int)Pass.Prefilter13 + qualityOffset
                    : (int)Pass.Downsample13 + qualityOffset;

                context.GetScreenSpaceTemporaryRT(cmd, mipDown, 0, context.sourceFormat, RenderTextureReadWrite.Default, FilterMode.Bilinear, tw, th);
                context.GetScreenSpaceTemporaryRT(cmd, mipUp, 0, context.sourceFormat, RenderTextureReadWrite.Default, FilterMode.Bilinear, tw, th);
                cmd.BlitFullscreenTriangle(lastDown, mipDown, sheet, pass);

                lastDown = mipDown;
                tw = Mathf.Max(tw / 2, 1);
                th = Mathf.Max(th / 2, 1);
            }

            // Upsample
            int lastUp = m_Pyramid[iterations - 1].down;
            for (int i = iterations - 2; i >= 0; i--)
            {
                int mipDown = m_Pyramid[i].down;
                int mipUp = m_Pyramid[i].up;
                cmd.SetGlobalTexture(ShaderIDs.BloomTex, mipDown);
                cmd.BlitFullscreenTriangle(lastUp, mipUp, sheet, (int)Pass.UpsampleTent + qualityOffset);
                lastUp = mipUp;
            }

            var linearColor = settings.color.value.linear;
            float intensity = RuntimeUtilities.Exp2(settings.intensity.value / 10f) - 1f;
            var shaderSettings = new Vector4(sampleScale, intensity, settings.dirtIntensity.value, iterations);

            // Debug overlays
            if (context.IsDebugOverlayEnabled(DebugOverlay.BloomThreshold))
            {
                context.PushDebugOverlay(cmd, context.source, sheet, (int)Pass.DebugOverlayThreshold);
            }
            else if (context.IsDebugOverlayEnabled(DebugOverlay.BloomBuffer))
            {
                sheet.properties.SetVector(ShaderIDs.ColorIntensity, new Vector4(linearColor.r, linearColor.g, linearColor.b, intensity));
                context.PushDebugOverlay(cmd, m_Pyramid[0].up, sheet, (int)Pass.DebugOverlayTent + qualityOffset);
            }

            // Lens dirtiness
            // Keep the aspect ratio correct & center the dirt texture, we don't want it to be
            // stretched or squashed
            var dirtTexture = settings.dirtTexture.value == null
                ? RuntimeUtilities.blackTexture
                : settings.dirtTexture.value;

            var dirtRatio = (float)dirtTexture.width / (float)dirtTexture.height;
            var screenRatio = (float)context.screenWidth / (float)context.screenHeight;
            var dirtTileOffset = new Vector4(1f, 1f, 0f, 0f);

            if (dirtRatio > screenRatio)
            {
                dirtTileOffset.x = screenRatio / dirtRatio;
                dirtTileOffset.z = (1f - dirtTileOffset.x) * 0.5f;
            }
            else if (screenRatio > dirtRatio)
            {
                dirtTileOffset.y = dirtRatio / screenRatio;
                dirtTileOffset.w = (1f - dirtTileOffset.y) * 0.5f;
            }

            // Shader properties
            var uberSheet = context.uberSheet;
            uberSheet.EnableKeyword("BLOOM");
            uberSheet.properties.SetVector(ShaderIDs.Bloom_DirtTileOffset, dirtTileOffset);
            uberSheet.properties.SetVector(ShaderIDs.Bloom_Settings, shaderSettings);
            uberSheet.properties.SetColor(ShaderIDs.Bloom_Color, linearColor);
            uberSheet.properties.SetTexture(ShaderIDs.Bloom_DirtTex, dirtTexture);
            cmd.SetGlobalTexture(ShaderIDs.BloomTex, lastUp);

            // Cleanup
            for (int i = 0; i < iterations; i++)
            {
                if (m_Pyramid[i].down != lastUp)
                    cmd.ReleaseTemporaryRT(m_Pyramid[i].down);
                if (m_Pyramid[i].up != lastUp)
                    cmd.ReleaseTemporaryRT(m_Pyramid[i].up);
            }

            cmd.EndSample("BloomPyramid");

            context.bloomBufferNameID = lastUp;
        }