1 files changed, 121 insertions, 0 deletions
diff --git a/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.h b/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.h
new file mode 100644
index 0000000000..5765d36b90
--- /dev/null
+++ b/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.h
@@ -0,0 +1,121 @@
+/*
+ * 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_A8;
+
+	// ################################################################################
+	// Block4x4Encoding_RGBA8
+	// RGBA8 if not completely opaque or transparent
+	// ################################################################################
+
+	class Block4x4Encoding_RGBA8 : public Block4x4Encoding_RGB8
+	{
+	public:
+
+		Block4x4Encoding_RGBA8(void);
+		virtual ~Block4x4Encoding_RGBA8(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);
+
+	protected:
+
+		static const unsigned int MODIFIER_TABLE_ENTRYS = 16;
+		static const unsigned int ALPHA_SELECTOR_BITS = 3;
+		static const unsigned int ALPHA_SELECTORS = 1 << ALPHA_SELECTOR_BITS;
+
+		static float s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_SELECTORS];
+
+		void CalculateA8(float a_fRadius);
+
+		Block4x4EncodingBits_A8 *m_pencodingbitsA8;	// A8 portion of Block4x4EncodingBits_RGBA8
+
+		float m_fBase;
+		float m_fMultiplier;
+		unsigned int m_uiModifierTableIndex;
+		unsigned int m_auiAlphaSelectors[PIXELS];
+
+	private:
+
+		inline float DecodePixelAlpha(float a_fBase, float a_fMultiplier,
+										unsigned int a_uiTableIndex, unsigned int a_uiSelector)
+		{
+			float fPixelAlpha = a_fBase + 
+								a_fMultiplier*s_aafModifierTable[a_uiTableIndex][a_uiSelector];
+			if (fPixelAlpha < 0.0f)
+			{
+				fPixelAlpha = 0.0f;
+			}
+			else if (fPixelAlpha > 1.0f)
+			{
+				fPixelAlpha = 1.0f;
+			}
+
+			return fPixelAlpha;
+		}
+
+	};
+
+	// ################################################################################
+	// Block4x4Encoding_RGBA8_Opaque
+	// RGBA8 if all pixels have alpha==1
+	// ################################################################################
+
+	class Block4x4Encoding_RGBA8_Opaque : public Block4x4Encoding_RGBA8
+	{
+	public:
+
+		virtual void PerformIteration(float a_fEffort);
+
+		virtual void SetEncodingBits(void);
+
+	};
+
+	// ################################################################################
+	// Block4x4Encoding_RGBA8_Transparent
+	// RGBA8 if all pixels have alpha==0
+	// ################################################################################
+
+	class Block4x4Encoding_RGBA8_Transparent : public Block4x4Encoding_RGBA8
+	{
+	public:
+
+		virtual void PerformIteration(float a_fEffort);
+
+		virtual void SetEncodingBits(void);
+
+	};
+
+	// ----------------------------------------------------------------------------------------------------
+	//
+
+} // namespace Etc