1 files changed, 144 insertions, 0 deletions
diff --git a/thirdparty/pvrtccompressor/PvrTcDecoder.cpp b/thirdparty/pvrtccompressor/PvrTcDecoder.cpp
new file mode 100644
index 0000000000..d8a36b342c
--- /dev/null
+++ b/thirdparty/pvrtccompressor/PvrTcDecoder.cpp
@@ -0,0 +1,144 @@
+//============================================================================
+
+#include "PvrTcDecoder.h"
+#include "PvrTcPacket.h"
+
+#include "MortonTable.h"
+#include <assert.h>
+
+//============================================================================
+
+using namespace Javelin;
+using Data::MORTON_TABLE;
+
+//============================================================================
+
+inline unsigned PvrTcDecoder::GetMortonNumber(int x, int y)
+{
+    return MORTON_TABLE[x >> 8] << 17 | MORTON_TABLE[y >> 8] << 16 | MORTON_TABLE[x & 0xFF] << 1 | MORTON_TABLE[y & 0xFF];
+}
+
+//============================================================================
+
+void PvrTcDecoder::DecodeRgb4Bpp(ColorRgb<unsigned char>* result, const Point2<int>& size, const void* data)
+{
+    assert(size.x == size.y);
+	
+	const int blocks = size.x / 4;
+	const int blockMask = blocks-1;
+    const PvrTcPacket* packets = static_cast<const PvrTcPacket*>(data);
+    
+    for(int y = 0; y < blocks; ++y)
+    {
+        for(int x = 0; x < blocks; ++x)
+        {
+            const PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+            
+            unsigned mod = packet->modulationData;
+			const unsigned char (*weights)[4] = PvrTcPacket::WEIGHTS + 4*packet->usePunchthroughAlpha;
+            const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
+			
+			for(int py = 0; py < 4; ++py)
+			{
+				const int yOffset = (py < 2) ? -1 : 0;
+				const int y0 = (y + yOffset) & blockMask;
+				const int y1 = (y0+1) & blockMask;
+				
+				for(int px = 0; px < 4; ++px)
+				{
+					const int xOffset = (px < 2) ? -1 : 0;
+					const int x0 = (x + xOffset) & blockMask;
+					const int x1 = (x0+1) & blockMask;
+					
+					const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
+					const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
+					const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
+					const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
+					
+					ColorRgb<int> ca = p0->GetColorRgbA() * (*factor)[0] +
+									   p1->GetColorRgbA() * (*factor)[1] +
+									   p2->GetColorRgbA() * (*factor)[2] +
+									   p3->GetColorRgbA() * (*factor)[3];
+					
+					ColorRgb<int> cb = p0->GetColorRgbB() * (*factor)[0] +
+									   p1->GetColorRgbB() * (*factor)[1] +
+									   p2->GetColorRgbB() * (*factor)[2] +
+									   p3->GetColorRgbB() * (*factor)[3];
+					
+					const unsigned char* w = weights[mod&3];
+					ColorRgb<unsigned char> c;
+					c.r = (ca.r * w[0] + cb.r * w[1]) >> 7;
+					c.g = (ca.g * w[0] + cb.g * w[1]) >> 7;
+					c.b = (ca.b * w[0] + cb.b * w[1]) >> 7;
+					
+					result[(py+y*4)*size.x + (px+x*4)] = c;
+					mod >>= 2;
+					factor++;
+				}
+			}
+        }
+    }
+}
+
+void PvrTcDecoder::DecodeRgba4Bpp(ColorRgba<unsigned char>* result, const Point2<int>& size, const void* data)
+{
+    assert(size.x == size.y);
+    
+	const int blocks = size.x / 4;
+	const int blockMask = blocks-1;
+    const PvrTcPacket* packets = static_cast<const PvrTcPacket*>(data);
+    
+    for(int y = 0; y < blocks; ++y)
+    {
+        for(int x = 0; x < blocks; ++x)
+        {
+            const PvrTcPacket* packet = packets + GetMortonNumber(x, y);
+            
+            unsigned mod = packet->modulationData;
+            const unsigned char (*weights)[4] = PvrTcPacket::WEIGHTS + 4*packet->usePunchthroughAlpha;
+            const unsigned char (*factor)[4] = PvrTcPacket::BILINEAR_FACTORS;
+			
+			for(int py = 0; py < 4; ++py)
+			{
+				const int yOffset = (py < 2) ? -1 : 0;
+				const int y0 = (y + yOffset) & blockMask;
+				const int y1 = (y0+1) & blockMask;
+				
+				for(int px = 0; px < 4; ++px)
+				{
+					const int xOffset = (px < 2) ? -1 : 0;
+					const int x0 = (x + xOffset) & blockMask;
+					const int x1 = (x0+1) & blockMask;
+					
+					const PvrTcPacket* p0 = packets + GetMortonNumber(x0, y0);
+					const PvrTcPacket* p1 = packets + GetMortonNumber(x1, y0);
+					const PvrTcPacket* p2 = packets + GetMortonNumber(x0, y1);
+					const PvrTcPacket* p3 = packets + GetMortonNumber(x1, y1);
+					
+					ColorRgba<int> ca = p0->GetColorRgbaA() * (*factor)[0] +
+									   	p1->GetColorRgbaA() * (*factor)[1] +
+									   	p2->GetColorRgbaA() * (*factor)[2] +
+										p3->GetColorRgbaA() * (*factor)[3];
+					
+					ColorRgba<int> cb = p0->GetColorRgbaB() * (*factor)[0] +
+										p1->GetColorRgbaB() * (*factor)[1] +
+										p2->GetColorRgbaB() * (*factor)[2] +
+										p3->GetColorRgbaB() * (*factor)[3];
+					
+					const unsigned char* w = weights[mod&3];
+					ColorRgba<unsigned char> c;
+					c.r = (ca.r * w[0] + cb.r * w[1]) >> 7;
+					c.g = (ca.g * w[0] + cb.g * w[1]) >> 7;
+					c.b = (ca.b * w[0] + cb.b * w[1]) >> 7;
+					c.a = (ca.a * w[2] + cb.a * w[3]) >> 7;
+					
+					result[(py+y*4)*size.x + (px+x*4)] = c;
+					mod >>= 2;
+					factor++;
+				}
+			}
+        }
+    }
+}
+
+//============================================================================