Add support for sampling VK_FORMAT_A2B10G10R10_UNORM_PACK32

src/Pipeline/SamplerCore.cpp

@@ -203,6 +203,8 @@ namespace sw
 				c.w = Float4(1.0f);
 			case VK_FORMAT_R32G32B32A32_SFLOAT:
 			case VK_FORMAT_R16G16B16A16_SFLOAT:
+			case VK_FORMAT_A2B10G10R10_UNORM_PACK32:
+			case VK_FORMAT_A2B10G10R10_UINT_PACK32:
 				break;
 			default:
 				ASSERT(false);
@@ -1682,6 +1684,25 @@ namespace sw
 				ASSERT(false);
 			}
 		}
+		else if(state.textureFormat == VK_FORMAT_A2B10G10R10_UNORM_PACK32)
+		{
+			Int4 cc;
+			cc = Insert(cc, Pointer<Int>(buffer[f0])[index[0]], 0);
+			cc = Insert(cc, Pointer<Int>(buffer[f1])[index[1]], 1);
+			cc = Insert(cc, Pointer<Int>(buffer[f2])[index[2]], 2);
+			cc = Insert(cc, Pointer<Int>(buffer[f3])[index[3]], 3);
+
+			// shift each 10 bit field left 6, and replicate 6 high bits into bottom 6
+			c.x = Short4(((cc << 6) & Int4(0xFFC0)) | ((cc >> 4) & Int4(0x3F)));
+			c.y = Short4(((cc >> 4) & Int4(0xFFC0)) | ((cc >> 14) & Int4(0x3F)));
+			c.z = Short4(((cc >> 14) & Int4(0xFFC0)) | ((cc >> 24) & Int4(0x3F)));
+			c.w = Short4(((cc >> 16) & Int4(0xC000)));
+
+			// replicate 2 bit alpha component all the way down
+			c.w |= (c.w >> 8) & Short4(0xc0);
+			c.w |= (c.w >> 4) & Short4(0x0c0c);
+			c.w |= (c.w >> 2) & Short4(0x3333);
+		}
 		else ASSERT(false);
 
 		if (state.textureFormat.isSRGBformat())