Author BeRo

Mistaken my identity on Twitter and the resulting harassment outside Twitter

To those who actually want to follow @coder.sara on Instagram and/ior Twitter. I am not he/she, Twitter seems to misinterpret @coder.sara as @coder . So for the clarification: I have nothing to do with this crytocurrency scammer and nothing to do with crytocurrency in general as I myself am very critical of these. Twitter should fix the handle-parsing, so it doesn't interfere with points/dots (@coder.sara <=> @coder ). 

As a result, among others, a female person from Italy (according to her Twitter profile) contacted me by email, where she found the email maybe by reverse searching my Twitter handle. She seem to have lost money at a crypto scam. At least she is now insulting and threatening me (though I'm the wrong person and not the scammer), even still after I tried to enlighten her about the identity confusion due to Twitter's incompetence. But no chance, she apparently wants to report me at the police now. For my part, my own report has already been filed. 

I had really tried to clarify her friendly, but … (read more)

The problems with the Intel Iris Xe (i)GPU archiecture in connection with USB-C and Thunderbolt docking stations.

I bought a new notebook (a gaming Asus TUF Dash F15 notebook, which I want to use as a workstation notebook), which also has an Intel Iris Xe iGPU (alongside an NVIDIA Geforce RTX3070). And that has exactly the same problems as my Samsung Galaxy Book Pro (also with Iris Xe iGPU) with USB-C and Thunderbolt docks with external monitors, with random dropouts and display timing mismatch problem. So there seems to be a general problem with the new Intel Iris Xe GPU architecture regarding the DisplayPort protocol over USB-C and Thunderbolt. Because I have six different USB-C and Thunderbolt docks, and with all of them the problems occur with these two different notebooks, each with an Intel Iris Xe (i)GPU. And of course, I've also tested through different cables and as well as different monitors, with absolutely no improvement. 

My new Samsung Galaxy Book Pro 13

I now have a Samsung Galaxy Book Pro 13 which weights only 868 grams. Unfortunately it‘s only the variant with the i5 and soldered 8GB RAM, because the variant with the i7 and 16GB RAM is no longer available and even nowhere in stock in the German DACH area. But I have already planned a BGA soldering upgrade to 16GB or even 32GB RAM by an expert in the field, where I am currently looking for someone who can do this for me. That means desoldering the old LPDDR4X RAM chips and soldering the new LPDDR4X RAM chips. Unfortunately BGA soldering is only possible with a professional infrared soldering device and the required skills to handle the soldering on the small scale of the chips. 

At the very least, the Samsung Galaxy Book with the i5-1135G7 beats my Thinkpad T480 with the i5 8250u and 32GB of RAM hands down in plain CPU performance, for the simple reason that the Samsung notebook simply throttles less often, if at all, whereas the Thinkpad T480 throttles frequently, if not almost always, and that's … (read more)

PasVulkan GLTF 2.0 support progress showcase with a sample with just one draw call per frame.

Here is a small PasVulkan GLTF 2.0 support progress showcase with a sample model case, which can draw with just one Vulkan CmdDrawIndexed call per frame, although that there are several animated nodes.  

My GLTF implementation at my PasVulkan framework tries to combine everything material-wise and primitive-topology-wise so that the GPU itself can do everything necessary animation-wise (joints and morph target vertices) in one go per material/primitive-topology-group. And in my GLTF implementation, there is no real hard limit on the number of joints and morph target vertices. 

For this purpose, each vertex points to respectively two special packed linked lists (one for joints in four-packed-pairs and for morph target vertices), which are stored in Vulkan storage buffers.  Each vertex is otherwise only 64 bytes in size, even though it contains position, the complete tangent-bitangent-normal space, two texture coordinates, color value, node index, linked list pointers, flags, etc.

And next to it there is also … (read more)

A brief insight in my my singable Text-To-Speech engine

(Hint: Here in this text is the word phone the phonetic phone, and not a phone device. And please do not confuse a phonetic phone with a phonetic phoneme, which is indeed something similar to a phonetic phone)
Today I'm going to tell you about my singable Text-To-Speech engine, which I also integrated into my own DAW. For simplicity's sake, I will primarily explain how MIDI events become the phone information data including f0 fundamental frequency envelopes, which my implementation of the MBROLA algorithm can process directly without re-parsing. And since a company is interested in my technology, where the DAW, which is quite well known, is also implemented in Object Pascal, I will not provide a code snippet this time. Let's start with the explanation of the procedure.

The first step is to extract all lyric text MIDI events from the remaining MIDI events and put them into a separate array, where each lyric text item has three fields, a text UTF8 string, a start time position 64-bit integer and an end time … (read more)

Interval-tree-less interval search on sorted array of linked MIDI events

Today I will tell you a trick to search an linear pre-sorted array of matching linked MIDI events with an interval without using an interval tree.

Each NoteOn MIDI event has a link pointer to its next NoteOff MIDI event, and each NoteOff MIDI event has a link pointer to its previous NoteOn MIDI event. This is important, because we'll stepping back in time while the search on the base on this interlink-information.

First we'll start at the interval start time with a help of a simple binary search, traverse the array until we'll either hit the interval end time or find a interlink-connection-information for stepping back in the time as new interval start time for a new second iteration (only a single next one!) for to get the full requested interval range.

This is now described here in a very simplified way, but as code it would look like this:

The piano roll editor in my DAW project is based on this interval-tree-less interval search of MIDI … (read more)

Arithmetic right shift in Delphi

A little tip if you do need a "Arithmetic shift right" operation in Delphi:

function SARLongint(Value,Shift:longint):longint;
{$if defined(cpu386)}assembler; register;
 mov ecx,edx
 sar eax,cl
{$elseif defined(cpux64)} assembler;
{$if defined(Windows) or defined(Win32) or defined(Win64)}
 mov eax,ecx
 mov ecx,edx
 sar eax,cl
 push rcx
 mov eax,edi
 mov ecx,esi
 sar eax,cl
 pop rcx
 Shift:=Shift and 31;
 result:=(longword(Value) shr Shift) or (longword(longint(longword(0-longword(longword(Value) shr 31)) and longword(0-longword(ord(Shift<>0) and 1)))) shl (32-Shift));

PasVulkan GLTF 2.0 support

I'm making progress with the GLTF 2.0 support in PasVulkan, but I'm still thinking about how to implement everything effectively so that as few draw calls as possible are necessary. The current plan is to pack everything in storage buffers, so that the vertex shaders always have the complete information about everything at any time such as for example morph targets, joints/bones, node transformations, etc. Because then the CPU only needs to update the most necessary and upload to the GPU what is necessary, the rest will be done by the GPU itself then. So stay tuned! 

A happy new year 2019 to you all in advance!

A happy new year 2019 to you all in advance! 😃


SPIR-V reflection and Virtual Reality support at PasVulkan

PasVulkan now has SPIR-V reflection built in directly, without any external third-party dependencies, in other words, it is really pure Object Pascal code that parses the SPIR-V code and extracts information from it.

The new TpVulkanShaderModule.GetReflectionData API parses the SPIR-V code and then returns information about the types, specialization constants and variables used there as a TpvVulkanShaderModuleReflectionData data structure that can be used for example to automatically create Vulkan pipelines and render passes from it.

This is now especially useful for data-driven rendering concepts and dynamic material systems, which will be exactly the next steps at PasVulkan too.

And by the way, PasVulkan now also has Virtual Reality support (which currently uses the VK_KHR_multiview extension and the OpenVR/SteamVR API), see PasVulkan.VirtualReality.pas unit.