Enumerate all available format conversions.

src/bgfx.cpp

@@ -1247,20 +1247,17 @@ namespace bgfx
 		for (uint32_t ii = 0; ii < BX_COUNTOF(s_emulatedFormats); ++ii)
 		{
 			const uint32_t fmt = s_emulatedFormats[ii];
-			if (0 == (g_caps.formats[fmt] & BGFX_CAPS_FORMAT_TEXTURE_2D) )
-			{
-				g_caps.formats[fmt] |= BGFX_CAPS_FORMAT_TEXTURE_2D_EMULATED;
-			}
-
-			if (0 == (g_caps.formats[fmt] & BGFX_CAPS_FORMAT_TEXTURE_3D) )
-			{
-				g_caps.formats[fmt] |= BGFX_CAPS_FORMAT_TEXTURE_3D_EMULATED;
-			}
+			g_caps.formats[fmt] |= 0 == (g_caps.formats[fmt] & BGFX_CAPS_FORMAT_TEXTURE_2D  ) ? BGFX_CAPS_FORMAT_TEXTURE_2D_EMULATED   : 0;
+			g_caps.formats[fmt] |= 0 == (g_caps.formats[fmt] & BGFX_CAPS_FORMAT_TEXTURE_3D  ) ? BGFX_CAPS_FORMAT_TEXTURE_3D_EMULATED   : 0;
+			g_caps.formats[fmt] |= 0 == (g_caps.formats[fmt] & BGFX_CAPS_FORMAT_TEXTURE_CUBE) ? BGFX_CAPS_FORMAT_TEXTURE_CUBE_EMULATED : 0;
+		}
 
-			if (0 == (g_caps.formats[fmt] & BGFX_CAPS_FORMAT_TEXTURE_CUBE) )
-			{
-				g_caps.formats[fmt] |= BGFX_CAPS_FORMAT_TEXTURE_CUBE_EMULATED;
-			}
+		for (uint32_t ii = 0; ii < TextureFormat::Count; ++ii)
+		{
+			bool convertable = imageConvert(TextureFormat::BGRA8, TextureFormat::Enum(ii) );
+			g_caps.formats[ii] |= 0 == (g_caps.formats[ii] & BGFX_CAPS_FORMAT_TEXTURE_2D  ) && convertable ? BGFX_CAPS_FORMAT_TEXTURE_2D_EMULATED   : 0;
+			g_caps.formats[ii] |= 0 == (g_caps.formats[ii] & BGFX_CAPS_FORMAT_TEXTURE_3D  ) && convertable ? BGFX_CAPS_FORMAT_TEXTURE_3D_EMULATED   : 0;
+			g_caps.formats[ii] |= 0 == (g_caps.formats[ii] & BGFX_CAPS_FORMAT_TEXTURE_CUBE) && convertable ? BGFX_CAPS_FORMAT_TEXTURE_CUBE_EMULATED : 0;
 		}
 
 		g_caps.rendererType = m_renderCtx->getRendererType();

src/image.cpp

@@ -1396,6 +1396,15 @@ namespace bgfx
 	};
 	BX_STATIC_ASSERT(TextureFormat::Count == BX_COUNTOF(s_packUnpack) );
 
+	bool imageConvert(TextureFormat::Enum _dstFormat, TextureFormat::Enum _srcFormat)
+	{
+		UnpackFn unpack = s_packUnpack[_srcFormat].unpack;
+		PackFn   pack   = s_packUnpack[_dstFormat].pack;
+		return NULL != pack
+			&& NULL != unpack
+			;
+	}
+
 	bool imageConvert(void* _dst, TextureFormat::Enum _dstFormat, const void* _src, TextureFormat::Enum _srcFormat, uint32_t _width, uint32_t _height)
 	{
 		UnpackFn unpack = s_packUnpack[_srcFormat].unpack;
@@ -3277,8 +3286,11 @@ namespace bgfx
 			break;
 
 		default:
-			// Decompression not implemented... Make ugly red-yellow checkerboard texture.
-			imageCheckerboard(_width, _height, 16, UINT32_C(0xffff0000), UINT32_C(0xffffff00), _dst);
+			if (!imageConvert(_dst, TextureFormat::BGRA8, _src, _format, _width, _height) )
+			{
+				// Failed to convert, just make ugly red-yellow checkerboard texture.
+				imageCheckerboard(_width, _height, 16, UINT32_C(0xffff0000), UINT32_C(0xffffff00), _dst);
+			}
 			break;
 		}
 	}

src/image.h

@@ -117,6 +117,9 @@ namespace bgfx
 	///
 	void imageCopy(uint32_t _width, uint32_t _height, uint32_t _bpp, uint32_t _pitch, const void* _src, void* _dst);
 
+	///
+	bool imageConvert(TextureFormat::Enum _dstFormat, TextureFormat::Enum _srcFormat);
+
 	///
 	bool imageConvert(void* _dst, TextureFormat::Enum _dstFormat, const void* _src, TextureFormat::Enum _srcFormat, uint32_t _width, uint32_t _height);