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, 122 deletions

diff --git a/thirdparty/etc2comp/EtcBlock4x4Encoding_R11.h b/thirdparty/etc2comp/EtcBlock4x4Encoding_R11.h
deleted file mode 100644
index b40c1e0036..0000000000
--- a/thirdparty/etc2comp/EtcBlock4x4Encoding_R11.h
+++ /dev/null
@@ -1,122 +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 "EtcBlock4x4Encoding_RGB8.h"
-
-namespace Etc
-{
-	class Block4x4EncodingBits_R11;
-
-	// ################################################################################
-	// Block4x4Encoding_R11
-	// ################################################################################
-
-	class Block4x4Encoding_R11 : public Block4x4Encoding_RGB8
-	{
-	public:
-
-		Block4x4Encoding_R11(void);
-		virtual ~Block4x4Encoding_R11(void);
-
-		virtual void InitFromSource(Block4x4 *a_pblockParent,
-			ColorFloatRGBA *a_pafrgbaSource,
-			unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric);
-
-		virtual void InitFromEncodingBits(Block4x4 *a_pblockParent,
-			unsigned char *a_paucEncodingBits,
-			ColorFloatRGBA *a_pafrgbaSource,
-			ErrorMetric a_errormetric);
-
-		virtual void PerformIteration(float a_fEffort);
-
-		virtual void SetEncodingBits(void);
-
-		inline float GetRedBase(void) const
-		{
-			return m_fRedBase;
-		}
-
-		inline float GetRedMultiplier(void) const
-		{
-			return m_fRedMultiplier;
-		}
-
-		inline int GetRedTableIndex(void) const
-		{
-			return m_uiRedModifierTableIndex;
-		}
-
-		inline const unsigned int * GetRedSelectors(void) const
-		{
-			return m_auiRedSelectors;
-		}
-
-	protected:
-
-		static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
-		static const unsigned int SELECTOR_BITS = 3;
-		static const unsigned int SELECTORS = 1 << SELECTOR_BITS;
-
-		static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS];
-
-		void CalculateR11(unsigned int a_uiSelectorsUsed, 
-							float a_fBaseRadius, float a_fMultiplierRadius);
-
-		
-
-	
-		inline float DecodePixelRed(float a_fBase, float a_fMultiplier,
-			unsigned int a_uiTableIndex, unsigned int a_uiSelector)
-		{
-			float fMultiplier = a_fMultiplier;
-			if (fMultiplier <= 0.0f)
-			{
-				fMultiplier = 1.0f / 8.0f;
-			}
-
-			float fPixelRed = a_fBase * 8 + 4 +
-				8 * fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector]*255;
-			fPixelRed /= 2047.0f;
-
-			if (fPixelRed < 0.0f)
-			{
-				fPixelRed = 0.0f;
-			}
-			else if (fPixelRed > 1.0f)
-			{
-				fPixelRed = 1.0f;
-			}
-
-			return fPixelRed;
-		}
-
-		Block4x4EncodingBits_R11 *m_pencodingbitsR11;
-
-		float m_fRedBase;
-		float m_fRedMultiplier;
-		float m_fRedBlockError;
-		unsigned int m_uiRedModifierTableIndex;
-		unsigned int m_auiRedSelectors[PIXELS];
-
-		
-	};
-
-	// ----------------------------------------------------------------------------------------------------
-	//
-
-} // namespace Etc