Reference code support for BC7/BPTC

Author: bangnoise

source/hap.c

@@ -46,24 +46,28 @@
 #define kHapFormatRGBADXT5 0xE
 #define kHapFormatYCoCgDXT5 0xF
 #define kHapFormatARGTC1 0x1
+#define kHapFormatRGBABPTC 0xC
 
 /*
  Packed byte values for Hap
  
  Format         Compressor      Byte Code
  ----------------------------------------
- RGB_DXT1       None            0xAB
- RGB_DXT1       Snappy          0xBB
- RGB_DXT1       Complex         0xCB
- RGBA_DXT5      None            0xAE
- RGBA_DXT5      Snappy          0xBE
- RGBA_DXT5      Complex         0xCE
- YCoCg_DXT5     None            0xAF
- YCoCg_DXT5     Snappy          0xBF
- YCoCg_DXT5     Complex         0xCF
- A_RGTC1        None            0xA1
- A_RGTC1        Snappy          0xB1
- A_RGTC1        Complex         0xC1
+ RGB_DXT1           None            0xAB
+ RGB_DXT1           Snappy          0xBB
+ RGB_DXT1           Complex         0xCB
+ RGBA_DXT5          None            0xAE
+ RGBA_DXT5          Snappy          0xBE
+ RGBA_DXT5          Complex         0xCE
+ YCoCg_DXT5         None            0xAF
+ YCoCg_DXT5         Snappy          0xBF
+ YCoCg_DXT5         Complex         0xCF
+ A_RGTC1            None            0xA1
+ A_RGTC1            Snappy          0xB1
+ A_RGTC1            Complex         0xC1
+ RGBA_BPTC_UNORM    None            0xAC
+ RGBA_BPTC_UNORM    Snappy          0xBC
+ RGBA_BPTC_UNORM    Complex         0xCC
  */
 
 /*
@@ -212,6 +216,8 @@ static unsigned int hap_texture_format_constant_for_format_identifier(unsigned i
             return HapTextureFormat_YCoCg_DXT5;
         case kHapFormatARGTC1:
             return HapTextureFormat_A_RGTC1;
+        case kHapFormatRGBABPTC:
+            return HapTextureFormat_RGBA_BPTC_UNORM;
         default:
             return 0;
 
@@ -231,6 +237,8 @@ static unsigned int hap_texture_format_identifier_for_format_constant(unsigned i
             return kHapFormatYCoCgDXT5;
         case HapTextureFormat_A_RGTC1:
             return kHapFormatARGTC1;
+        case HapTextureFormat_RGBA_BPTC_UNORM:
+            return kHapFormatRGBABPTC;
         default:
             return 0;
     }
@@ -346,6 +354,7 @@ static unsigned int hap_encode_texture(const void *inputBuffer, unsigned long in
             && textureFormat != HapTextureFormat_RGBA_DXT5
             && textureFormat != HapTextureFormat_YCoCg_DXT5
             && textureFormat != HapTextureFormat_A_RGTC1
+            && textureFormat != HapTextureFormat_RGBA_BPTC_UNORM
             )
         || (compressor != HapCompressorNone
             && compressor != HapCompressorSnappy

source/hap.h

@@ -33,15 +33,16 @@ extern "C" {
 #endif
 
 /*
- These match the constants defined by GL_EXT_texture_compression_s3tc and
- GL_ARB_texture_compression_rgtc
+ These match the constants defined by GL_EXT_texture_compression_s3tc,
+ GL_ARB_texture_compression_rgtc and GL_ARB_texture_compression_bptc
  */
 
 enum HapTextureFormat {
     HapTextureFormat_RGB_DXT1 = 0x83F0,
     HapTextureFormat_RGBA_DXT5 = 0x83F3,
     HapTextureFormat_YCoCg_DXT5 = 0x01,
-    HapTextureFormat_A_RGTC1 = 0x8DBB
+    HapTextureFormat_A_RGTC1 = 0x8DBB,
+    HapTextureFormat_RGBA_BPTC_UNORM = 0x8E8C
 };
 
 enum HapCompressor {