1 files changed, 13 insertions, 76 deletions
diff --git a/thirdparty/squish/colourblock.cpp b/thirdparty/squish/colourblock.cpp
index 3de46382c0..3d87adaa77 100644
--- a/thirdparty/squish/colourblock.cpp
+++ b/thirdparty/squish/colourblock.cpp
@@ -24,6 +24,9 @@
    -------------------------------------------------------------------------- */
 
 #include "colourblock.h"
+// -- Godot start --
+#include "alpha.h"
+// -- Godot end --
 
 namespace squish {
 
@@ -214,83 +217,17 @@ void DecompressColour( u8* rgba, void const* block, bool isDxt1 )
 // -- Godot start --
 void DecompressColourBc5( u8* rgba, void const* block)
 {
-    // get the block bytes
-    u8 const* bytes = reinterpret_cast< u8 const* >( block );
-
-    // unpack the endpoints
-    u8 codes[16];
-    int red_0 = bytes[0];
-    int red_1 = bytes[1];
-
-    codes[0] = red_0;
-    codes[1] = red_1;
-    codes[6] = 0.0f;
-    codes[7] = 1.0f;
-    // generate the midpoints
-    if(red_0 > red_1)
-    {
-        for( int i = 2; i < 8; ++i )
-        {
-            codes[i] = ((8-i)*red_0 + (i-1)*red_1)/7;
-        }
-    }
-    else
-    {
-        for( int i = 2; i < 6; ++i )
-        {
-            codes[i] = ((6-i)*red_0 + (i-1)*red_1)/5;
-        }
-    }
-
-    int green_0 = bytes[8];
-    int green_1 = bytes[9];
-
-    codes[0 + 8] = green_0;
-    codes[1 + 8] = green_1;
-    codes[6 + 8] = 0.0f;
-    codes[7 + 8] = 1.0f;
-    // generate the midpoints
-    if(green_0 > green_1)
-    {
-        for( int i = 2; i < 8; ++i )
-        {
-            codes[i + 8] = ((8-i)*green_0 + (i-1)*green_1)/7;
-        }
-    }
-    else
-    {
-        for( int i = 2; i < 6; ++i )
-        {
-            codes[i + 8] = ((6-i)*green_0 + (i-1)*green_1)/5;
-        }
-    }
-
-    u8 indices[32];
-    for( int i = 0; i < 4; ++i )
-    {
-        u8 packed = bytes[2 + i];
-        u8* red_ind = indices + 4*i;
-
-        red_ind[0] = packed & 0x3;
-        red_ind[1] = ( packed >> 2 ) & 0x3;
-        red_ind[2] = ( packed >> 4 ) & 0x3;
-        red_ind[3] = ( packed >> 6 ) & 0x3;
-
-        packed = bytes[8 + i];
-        u8* green_ind = indices + 4*i + 16;
-        green_ind[0] = packed & 0x3;
-        green_ind[1] = ( packed >> 2 ) & 0x3;
-        green_ind[2] = ( packed >> 4 ) & 0x3;
-        green_ind[3] = ( packed >> 6 ) & 0x3;
+    void const* rblock = block;
+    void const* gblock = reinterpret_cast< u8 const* >( block ) + 8;
+    DecompressAlphaDxt5(rgba,rblock);
+    for ( int i = 0; i < 16; ++i ) {
+        rgba[i*4] = rgba[i*4 + 3];
     }
-
-    // store out the colours
-    for( int i = 0; i < 16; ++i )
-    {
-        rgba[4*i] = codes[indices[i]];
-        rgba[4*i +1] = codes[indices[i + 16] + 8];
-        rgba[4*i +2] = 0;
-        rgba[4*i +3] = 255;
+    DecompressAlphaDxt5(rgba,gblock);
+    for ( int i = 0; i < 16; ++i ) {
+        rgba[i*4+1] = rgba[i*4 + 3];
+        rgba[i*4 + 2] = 0;
+        rgba[i*4 + 3] = 255;
     }
 }
 // -- GODOT end --