Warnings: Fixed a few missing-return warnings in video_core.

src/video_core/regs_framebuffer.h

@@ -256,10 +256,9 @@ struct FramebufferRegs {
             return 3;
         case DepthFormat::D24S8:
             return 4;
-        default:
-            LOG_CRITICAL(HW_GPU, "Unknown depth format %u", format);
-            UNIMPLEMENTED();
         }
+
+        ASSERT_MSG(false, "Unknown depth format %u", format);
     }
 
     // Returns the number of bits per depth component of the specified depth format
@@ -270,10 +269,9 @@ struct FramebufferRegs {
         case DepthFormat::D24:
         case DepthFormat::D24S8:
             return 24;
-        default:
-            LOG_CRITICAL(HW_GPU, "Unknown depth format %u", format);
-            UNIMPLEMENTED();
         }
+
+        ASSERT_MSG(false, "Unknown depth format %u", format);
     }
 
     INSERT_PADDING_WORDS(0x20);

src/video_core/swrasterizer/framebuffer.cpp

@@ -352,6 +352,8 @@ u8 LogicOp(u8 src, u8 dest, FramebufferRegs::LogicOp op) {
     case FramebufferRegs::LogicOp::OrInverted:
         return ~src | dest;
     }
+
+    UNREACHABLE();
 };
 
 } // namespace Rasterizer

src/video_core/swrasterizer/texturing.cpp

@@ -89,6 +89,8 @@ Math::Vec3<u8> GetColorModifier(TevStageConfig::ColorModifier factor,
     case ColorModifier::OneMinusSourceBlue:
         return (Math::Vec3<u8>(255, 255, 255) - values.bbb()).Cast<u8>();
     }
+
+    UNREACHABLE();
 };
 
 u8 GetAlphaModifier(TevStageConfig::AlphaModifier factor, const Math::Vec4<u8>& values) {
@@ -119,6 +121,8 @@ u8 GetAlphaModifier(TevStageConfig::AlphaModifier factor, const Math::Vec4<u8>&
     case AlphaModifier::OneMinusSourceBlue:
         return 255 - values.b();
     }
+
+    UNREACHABLE();
 };
 
 Math::Vec3<u8> ColorCombine(TevStageConfig::Operation op, const Math::Vec3<u8> input[3]) {