April 2020 - Pro-apps-dev - lists.apple.com

Re: Metal AlphaBlending in FxPlug
by Darrin Cardani via Pro-apps-dev 02 Apr '20

02 Apr '20

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com If you want to send me an example, I can take a look at it. You can just modify FxShape and send that, if you want. What you’ve written below seems like it should work, but I find it easy to miss things with both Metal and OpenGL. Darrin > On Apr 2, 2020, at 10:03 AM, Bret Battey via Pro-apps-dev > <pro-apps-dev(a)lists.apple.com> wrote: > > Thanks for that very fast response on question 1! > > So now for question 2: > > I am converting a plugin to Metal that used alpha blending to layer and mix > OpenGL points (tells you how behind I am). > > I am using the FxShape example as my core model to work from. I have adapted > the circle draw to take position and RGBA color arguments, have implemented > MSAA, and now am trying to get alpha blending of overlapped circles to work. > Piecing together examples from online, it seems like it should be > (relatively) straightforward. However, I am just getting solid colors, no > blends. > > So am wondering if there might be something odd about doing this in the > Motion context that I am overlooking. I have noted that some errors in online > examples have been solved by changing texture types or in one case having to > a CAMetalLayer ‘opaque’property to false, but it is not clear to me if/how > any of that would apply within an FxPlug. > > In FxMTLDeviceCache, I add code to the Shape Pipeline State descriptor to > enable blending and set blending options, taking into account that Motion is > premultiplied alpha: > > pipelineStateDescriptor.colorAttachments[0].blendingEnabled = TRUE; > pipelineStateDescriptor.colorAttachments[0].sourceRGBBlendFactor = > MTLBlendFactorOne; > pipelineStateDescriptor.colorAttachments[0].destinationRGBBlendFactor = > MTLBlendFactorOneMinusSourceAlpha; > pipelineStateDescriptor.colorAttachments[0].rgbBlendOperation = > MTLBlendOperationAdd; > pipelineStateDescriptor.colorAttachments[0].sourceAlphaBlendFactor = > MTLBlendFactorOne; > pipelineStateDescriptor.colorAttachments[0].destinationAlphaBlendFactor = > MTLBlendFactorOneMinusSourceAlpha; > pipelineStateDescriptor.colorAttachments[0].alphaBlendOperation = > MTLBlendOperationAdd; > > As far as I understand, that should be enough – that there is no need to > alter the fragment shader. All the fragment shader needs to do is return the > appropriate color, including its alpha value, and Metal should take care of > the blending… Of course, I could have this desperately wrong, as well 😉 > > Thanks, > -=Bret > > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com > <mailto:Pro-apps-dev@lists.apple.com>) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/pro-apps-dev/dcardani%40apple.com > <https://lists.apple.com/mailman/options/pro-apps-dev/dcardani%40apple.com> > > This email sent to dcardani(a)apple.com <mailto:dcardani@apple.com> _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Metal AlphaBlending in FxPlug
by Bret Battey via Pro-apps-dev 02 Apr '20

02 Apr '20

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=DeMontfortUniversity.onmicrosoft.com; s=selector2-DeMontfortUniversity-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=idcAsZ6i2taDrDq14GTW17x6KugjIQQmb7VYL8WAfUQ=; b=pxwoQUrUlDWxVz+vc3a0VcQGZKMxcKnj3odjBTsZ3RiXyjhJizkoo5ME5UPh5uc99iWb7WaGyuTSK7SlZlaXv3SAFLW7QclDWcX9SUSdCc8M7mJAC5ATppeKOjbvDQbMfs6ZQ+oUCLleTiUDXM4/j1ByaEVxNRPbnZowgPRVsl4= Thread-index: AQHWCRCeuoWMtgmom0ywkg7KRj6cAA== Thread-topic: Metal AlphaBlending in FxPlug User-agent: Microsoft-MacOutlook/16.35.20030802 Thanks for that very fast response on question 1! So now for question 2: I am converting a plugin to Metal that used alpha blending to layer and mix OpenGL points (tells you how behind I am). I am using the FxShape example as my core model to work from. I have adapted the circle draw to take position and RGBA color arguments, have implemented MSAA, and now am trying to get alpha blending of overlapped circles to work. Piecing together examples from online, it seems like it should be (relatively) straightforward. However, I am just getting solid colors, no blends. So am wondering if there might be something odd about doing this in the Motion context that I am overlooking. I have noted that some errors in online examples have been solved by changing texture types or in one case having to a CAMetalLayer ‘opaque’property to false, but it is not clear to me if/how any of that would apply within an FxPlug. In FxMTLDeviceCache, I add code to the Shape Pipeline State descriptor to enable blending and set blending options, taking into account that Motion is premultiplied alpha: pipelineStateDescriptor.colorAttachments[0].blendingEnabled = TRUE; pipelineStateDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorOne; pipelineStateDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha; pipelineStateDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd; pipelineStateDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorOne; pipelineStateDescriptor.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOneMinusSourceAlpha; pipelineStateDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd; As far as I understand, that should be enough – that there is no need to alter the fragment shader. All the fragment shader needs to do is return the appropriate color, including its alpha value, and Metal should take care of the blending… Of course, I could have this desperately wrong, as well 😉 Thanks, -=Bret _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: FxPlug & Metal shader debugger pre OS 10.15
by Darrin Cardani via Pro-apps-dev 02 Apr '20

02 Apr '20

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Unfortunately, at this time, the Metal shader debugger is not working when debugging an XPC Service. We have an issue opened about it, and it’s being looked at by the dev. tools team, but they have not yet found a fix. One option is to do your shader debugging in a test app rather than in your FxPlug, and once it’s working properly, then try it in your FxPlug. It’s not perfect, but it’s the only workaround I know of for the time being. Darrin > On Apr 2, 2020, at 9:29 AM, Bret Battey via Pro-apps-dev > <pro-apps-dev(a)lists.apple.com> wrote: > > Hi Pro-Apps-Dev, > > It has been a while since I have posted here! I am currently doing my first > work in FxPlug v4 and converting old OpenGL/FxPlug 3.0 code to Metal. > > Question 1: Is there some way to access the Metal shader debugger when we > use Xcode to run our plugin in Motion in OS 10.14? The Metal documentation > online seems to describe a way (triggering a programmatic capture) that, as > far as I can determine, relies on 10.15. > > Thanks, > -=Bret > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com > <mailto:Pro-apps-dev@lists.apple.com>) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/pro-apps-dev/dcardani%40apple.com > <https://lists.apple.com/mailman/options/pro-apps-dev/dcardani%40apple.com> > > This email sent to dcardani(a)apple.com <mailto:dcardani@apple.com> _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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FxPlug & Metal shader debugger pre OS 10.15
by Bret Battey via Pro-apps-dev 02 Apr '20

02 Apr '20

site_archiver(a)lists.apple.com Delivered-To: pro-apps-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=DeMontfortUniversity.onmicrosoft.com; s=selector2-DeMontfortUniversity-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=e+1likmBJXh1p//BFas4HFe5Pjvduscl9dkbDbCXIo4=; b=InFjk12yN8GfnjOo3RGvFkUkxatFQFr4YVg/8f4CBiHCDqYUHHu+U3qHYn79wlDU1L1eaCV/epcBMNDbjmzi4UwnAAOJvWYesWzucNEtZHub/pRXjAj31ogOhlr/kjQAVjFDspfx6GXTADaTlI+Tafsx0v0YtnaulzDr7Q3wZxQ= Thread-index: AQHWCQvlbezcYM8x0Uu4fpDrF6kN5Q== Thread-topic: FxPlug & Metal shader debugger pre OS 10.15 User-agent: Microsoft-MacOutlook/16.35.20030802 Hi Pro-Apps-Dev, It has been a while since I have posted here! I am currently doing my first work in FxPlug v4 and converting old OpenGL/FxPlug 3.0 code to Metal. Question 1: Is there some way to access the Metal shader debugger when we use Xcode to run our plugin in Motion in OS 10.14? The Metal documentation online seems to describe a way (triggering a programmatic capture) that, as far as I can determine, relies on 10.15. Thanks, -=Bret _______________________________________________ Do not post admin requests to the list. They will be ignored. Pro-apps-dev mailing list (Pro-apps-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/pro-apps-dev/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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