GitHub - weltkante/TiledTextureTest: Documents tiled texture problems on Surface Pro 4

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Documents tiled texture problems on Surface Pro 4

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Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
.gitignore		.gitignore
PixelShader.hlsl		PixelShader.hlsl
TiledTextureTest.sln		TiledTextureTest.sln
TiledTextureTest.vcxproj		TiledTextureTest.vcxproj
TiledTextureTest.vcxproj.filters		TiledTextureTest.vcxproj.filters
TiledTextureTest.vcxproj.user		TiledTextureTest.vcxproj.user
VertexShader.hlsl		VertexShader.hlsl
actual1a.png		actual1a.png
actual1b.png		actual1b.png
actual2.png		actual2.png
expected1.png		expected1.png
expected2.png		expected2.png
image.png		image.png
main.cpp		main.cpp
readme.html		readme.html

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<html>
<body>
<h3>Instructions</h3>
<p>Compile the program and run it.<br>
A left click into the window tests <b>UpdateTiles</b><br>
A right click into the window tests <b>UpdateSubresouce</b><br><br>
You can change the <b>#define USE_WARP_DEVICE</b> from <b>0</b> to <b>1</b> to use the WARP device
</p>

<h3>Expected result</h3>
<p>The images are generated by running the test program with the WARP device.<br>
On the left I upload the test image to a whole tile via <b>UpdateTiles</b><br>
On the right I upload the test image into a subsection of the tile via <b>UpdateSubresouce</b>
</p>
<p>
<img src="expected1.png" width="300px" height="300px">
<img src="expected2.png" width="300px" height="300px">
</p>

<h3>Actual result</h3>
<p>When using <b>UpdateTiles</b> only one 16th of the texture is uploaded but that part is repeated, and even that part is randomly garbled. The exact visual results are random and differ between each call so I included two example images.
</p>
<p>When using <b>UpdateSubresouce</b> the texture is transferred into the tile but everything outside the updated section is overwritten by repeating the uploaded segment. This only happens when the target of the call is a tiled texture, if I run the same call on a non-tiled texture it works as expected and preserves the texture content outside the updated section.
</p>
<p>
<img src="actual1a.png" width="300px" height="300px">
<img src="actual2.png" width="300px" height="300px"><br>
<img src="actual1b.png" width="300px" height="300px">
</p>

</body>
</html>