Add `etcpak` library for faster ETC/ETC2/S3TC imports.

- `etc` module was renamed to `etcpak` and modified to use the new library.
- PKM importer is removed in the process, it's obsolete.
- Old library `etc2comp` is removed.
- S3TC compression no longer done via `squish` (but decompression still is).
- Slight modifications to etcpak sources for MinGW compatibility,
  to fix LLVM `-Wc++11-narrowing` errors, and to allow using vendored or
  system libpng.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

1 files changed, 0 insertions, 40 deletions

diff --git a/thirdparty/etc2comp/EtcMath.h b/thirdparty/etc2comp/EtcMath.h
deleted file mode 100644
index c58c9a91bc..0000000000
--- a/thirdparty/etc2comp/EtcMath.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2015 The Etc2Comp Authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *  http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include <math.h>
-
-namespace Etc
-{
-
-	// ----------------------------------------------------------------------------------------------------
-	// return true if vertical line
-	bool Regression(float a_afX[], float a_afY[], unsigned int a_Points,
-					float *a_fSlope, float *a_fOffset);
-
-	inline float ConvertMSEToPSNR(float a_fMSE)
-	{
-		if (a_fMSE == 0.0f)
-		{
-			return INFINITY;
-		}
-
-		return 10.0f * log10f(1.0f / a_fMSE);
-	}
-
-
-}