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SwANGLE does not support GL_EXT_texture_compression_s3tc. However, it does support GL_EXT_texture_compression_dxt1, GL_ANGLE_texture_compression_dxt3 and GL_ANGLE_texture_compression_dxt5, which should be sufficient for Dawn's purposes. Note that sRGB formats may be problematic for OpenGL ES in general, but ANGLE does support them, so we can satisfy the requirements for Dawn's texture_compression_bc and exercise the codepaths on ES. glPixelStorei is not only unsupported for CompressedTexSubImage*D() but causes asserts in ANGLE and validation errors elsewhere. The fix is to scope the glPixelStorei() calls to the non-compressed codepath. Bug: dawn:580 Change-Id: I68fa019eda2aee37a097e697cfc87bcdc28c1f12 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/42120 Reviewed-by: Austin Eng <enga@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Stephen White <senorblanco@chromium.org>