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Very neat and very funny to me as I'm building a project using win98 css.
https://jdan.github.io/98.css/
One day kids are going be nostalgic for the windows7 the same way I'm nostalgic for win98.
These shaders are *.bin resources embedded in dwmcore.dll.
This tool can extract https://www.nirsoft.net/utils/resources_extract.html Then, cmd_decompiler.exe from there https://github.com/bo3b/3Dmigoto can either disassemble or decompile these binaries.
The pixel shaders there include both ps_4_0 code for new GPUs, and ps_2_0 for running on Direct3D9 GPUs.
They first sample from 4 pixels of the source texture. The sample locations are computed by vertex shaders somehow, and passed in TEXCOORD1 and TEXCOORD2 input registers. 2D sampler needs 2 floats for UV on input, texture coordinate vectors have up to 4 components on GPUs, so they’re packing 4 2D vectors into two 4D ones, and using xy and zw slices of these vectors.
At this stage, they’re using pre-multiplied alpha.
For the next step of the pixel shader, they compare alpha with zero. If not zero, they convert the color to straight alpha, apply this formula https://entropymine.com/imageworsener/srgbformula/ to convert from sRGB to linear, then convert back to pre-multiplied alpha.
For the last step, they’re applying linear transformation to the color using input values passed in the constant buffer. This part varies a lot for different shaders. Some shaders only using a single scalar constant, and returning (alpha.wwww*result)^2 color. Other shaders are using 4x5 transformation matrix in the constant buffer to transform the final color.
> For instance, The Windows 10 start menu uses EdgeHTML inside (just press F7 and Caret Browsing dialog will show up).
This also happens in Calculator, and if you look at its source code [0], you’ll see it uses XAML views. I think Caret Browsing is a UWP feature, not necessarily an EdgeHTML thing.
[0]: https://github.com/microsoft/calculator/tree/master/src/Calc...