Disable filtering on 1x1 textures.

Textures with just one texel don't require filtering. This also avoids precision issues for pedantic tests which expect exact values. Bug swiftshader:39 Change-Id: I52c5697e277523e2b8cb2c879ba0a7b2296ee7c5 Reviewed-on: https://swiftshader-review.googlesource.com/9068Reviewed-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>

Disable filtering on 1x1 textures.
2ed3149a · Nicolas Capens · 22be88e5 · 2ed3149a
Commit 2ed3149a authored Mar 30, 2017 by Nicolas Capens
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Sampler.cpp src/Renderer/Sampler.cpp +9 -0

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--- a/src/Renderer/Sampler.cpp
+++ b/src/Renderer/Sampler.cpp
@@ -406,6 +406,15 @@ namespace sw

 	FilterType Sampler::getTextureFilter() const
 	{
+		// Don't filter 1x1 textures.
+		if(texture.mipmap[0].width[0] == 1 && texture.mipmap[0].height[0] == 1 && texture.mipmap[0].depth[0] == 1)
+		{
+			if(mipmapFilter() == MIPMAP_NONE)
+			{
+				return FILTER_POINT;
+			}
+		}
+
 		FilterType filter = textureFilter;

 		if(gather && Surface::componentCount(internalTextureFormat) == 1)