video_core: Silence signed/unsigned mismatch warnings

src/video_core/renderer_opengl/gl_texture_cache.cpp

@@ -327,7 +327,8 @@ void ApplySwizzle(GLuint handle, PixelFormat format, std::array<SwizzleSource, 4
     if (format_info.is_compressed) {
         return false;
     }
-    if (std::ranges::find(ACCELERATED_FORMATS, internal_format) == ACCELERATED_FORMATS.end()) {
+    if (std::ranges::find(ACCELERATED_FORMATS, static_cast<int>(internal_format)) ==
+        ACCELERATED_FORMATS.end()) {
         return false;
     }
     if (format_info.compatibility_by_size) {

src/video_core/texture_cache/image_base.cpp

@@ -82,7 +82,7 @@ std::optional<SubresourceBase> ImageBase::TryFindBase(GPUVAddr other_addr) const
     if (info.type != ImageType::e3D) {
         const auto [layer, mip_offset] = LayerMipOffset(diff, info.layer_stride);
         const auto end = mip_level_offsets.begin() + info.resources.levels;
-        const auto it = std::find(mip_level_offsets.begin(), end, mip_offset);
+        const auto it = std::find(mip_level_offsets.begin(), end, static_cast<u32>(mip_offset));
         if (layer > info.resources.layers || it == end) {
             return std::nullopt;
         }

src/video_core/texture_cache/util.cpp

@@ -394,7 +394,7 @@ template <u32 GOB_EXTENT>
     const s32 mip_offset = diff % layer_stride;
     const std::array offsets = CalculateMipLevelOffsets(new_info);
     const auto end = offsets.begin() + new_info.resources.levels;
-    const auto it = std::find(offsets.begin(), end, mip_offset);
+    const auto it = std::find(offsets.begin(), end, static_cast<u32>(mip_offset));
     if (it == end) {
         // Mipmap is not aligned to any valid size
         return std::nullopt;

src/video_core/textures/astc.cpp

@@ -1365,8 +1365,8 @@ static void DecompressBlock(std::span<const u8, 16> inBuf, const u32 blockWidth,
     // each partition.
 
     // Determine partitions, partition index, and color endpoint modes
-    s32 planeIdx = -1;
-    u32 partitionIndex;
+    u32 planeIdx{UINT32_MAX};
+    u32 partitionIndex{};
     u32 colorEndpointMode[4] = {0, 0, 0, 0};
 
     // Define color data.