GPUTexture: Don't assemble vector in GetSizeVec()

Use a load/extend instead. Turns into movd+pmovzxwd.

src/util/gpu_device.cpp

@@ -236,6 +236,9 @@ size_t GPUFramebufferManagerBase::KeyHash::operator()(const Key& key) const
 
 GPUSwapChain::GPUSwapChain(const WindowInfo& wi, GPUVSyncMode vsync_mode) : m_window_info(wi), m_vsync_mode(vsync_mode)
 {
+  // Needed for the GetSizeVec() function to work.
+  static_assert(OFFSETOF(GPUSwapChain, m_window_info.surface_height) ==
+                OFFSETOF(GPUSwapChain, m_window_info.surface_width) + sizeof(u16));
 }
 
 GPUSwapChain::~GPUSwapChain() = default;

src/util/gpu_device.h

@@ -471,10 +471,7 @@ public:
   ALWAYS_INLINE void SetRefreshRate(float refresh_rate) { m_window_info.surface_refresh_rate = refresh_rate; }
   ALWAYS_INLINE WindowInfoPrerotation GetPreRotation() const { return m_window_info.surface_prerotation; }
   ALWAYS_INLINE GPUTextureFormat GetFormat() const { return m_window_info.surface_format; }
-  ALWAYS_INLINE GSVector2i GetSizeVec() const
-  {
-    return GSVector2i(m_window_info.surface_width, m_window_info.surface_height);
-  }
+  ALWAYS_INLINE GSVector2i GetSizeVec() const { return GSVector2i::load32(&m_window_info.surface_width).u16to32(); }
   ALWAYS_INLINE GSVector2i GetPostRotatedSizeVec() const
   {
     return GSVector2i(m_window_info.GetPostRotatedWidth(), m_window_info.GetPostRotatedHeight());

src/util/gpu_texture.cpp

@@ -16,6 +16,8 @@ GPUTexture::GPUTexture(u16 width, u16 height, u8 layers, u8 levels, u8 samples,
   : m_width(width), m_height(height), m_layers(layers), m_levels(levels), m_samples(samples), m_type(type),
     m_format(format), m_flags(flags)
 {
+  // Needed for the GPUTexture::GetSizeVec() and GPUTexture::GetRect() functions to work correctly.
+  static_assert(OFFSETOF(GPUTexture, m_height) == OFFSETOF(GPUTexture, m_width) + sizeof(u16));
   GPUDevice::s_total_vram_usage += GetVRAMUsage();
 }
 

src/util/gpu_texture.h

@@ -92,11 +92,8 @@ public:
   ALWAYS_INLINE GPUTextureFormat GetFormat() const { return m_format; }
   ALWAYS_INLINE Flags GetFlags() const { return m_flags; }
   ALWAYS_INLINE bool HasFlag(Flags flag) const { return ((static_cast<u8>(m_flags) & static_cast<u8>(flag)) != 0); }
-  ALWAYS_INLINE GSVector2i GetSizeVec() const { return GSVector2i(m_width, m_height); }
-  ALWAYS_INLINE GSVector4i GetRect() const
-  {
-    return GSVector4i(0, 0, static_cast<s32>(m_width), static_cast<s32>(m_height));
-  }
+  ALWAYS_INLINE GSVector2i GetSizeVec() const { return GSVector2i::load32(&m_width).u16to32(); }
+  ALWAYS_INLINE GSVector4i GetRect() const { return GSVector4i::loadh(GetSizeVec()); }
 
   ALWAYS_INLINE bool IsTextureArray() const { return m_layers > 1; }
   ALWAYS_INLINE bool IsMultisampled() const { return m_samples > 1; }