diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
index de5214fc..3269165c 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
@@ -2094,7 +2094,15 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         case SpvImageFormatR11fG11fB10f: return VK_FORMAT_B10G11R11_UFLOAT_PACK32;
         case SpvImageFormatR16f: return VK_FORMAT_R16_SFLOAT;
         case SpvImageFormatRgba16: return VK_FORMAT_R16G16B16A16_UNORM;
-        case SpvImageFormatRgb10A2: return VK_FORMAT_A2R10G10B10_UNORM_PACK32;
+        // A2**B**10G10R10, matching MGToVk::ConvertTextureInternalFormatToVkFormat's RGB10A2.
+        // This value becomes the storage image VIEW's format while the image itself was created
+        // from the texture's internal format, so the two must name the same bit layout or the
+        // shader reads the texel through a different component order than the host wrote it.
+        // GL_RGB10_A2 with GL_UNSIGNED_INT_2_10_10_10_REV puts R in bits 0-9, G in 10-19, B in
+        // 20-29 and A in 30-31, which is Vulkan's A2B10G10R10; A2R10G10B10 transposes R and B.
+        // KHR-GL43.shader_image_load_store.basic-allFormats-store read back [2,1,0,3] for an
+        // rgb10_a2ui image stored as [0,1,2,3] while these two converters disagreed.
+        case SpvImageFormatRgb10A2: return VK_FORMAT_A2B10G10R10_UNORM_PACK32;
         case SpvImageFormatRg16: return VK_FORMAT_R16G16_UNORM;
         case SpvImageFormatRg8: return VK_FORMAT_R8G8_UNORM;
         case SpvImageFormatR16: return VK_FORMAT_R16_UNORM;
@@ -2117,7 +2125,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         case SpvImageFormatRgba16ui: return VK_FORMAT_R16G16B16A16_UINT;
         case SpvImageFormatRgba8ui: return VK_FORMAT_R8G8B8A8_UINT;
         case SpvImageFormatR32ui: return VK_FORMAT_R32_UINT;
-        case SpvImageFormatRgb10a2ui: return VK_FORMAT_A2R10G10B10_UINT_PACK32;
+        case SpvImageFormatRgb10a2ui: return VK_FORMAT_A2B10G10R10_UINT_PACK32; // see Rgb10A2 above
         case SpvImageFormatRg32ui: return VK_FORMAT_R32G32_UINT;
         case SpvImageFormatRg16ui: return VK_FORMAT_R16G16_UINT;
         case SpvImageFormatRg8ui: return VK_FORMAT_R8G8_UINT;
diff --git a/MobileGL/MG_Test/SanityTest.cpp b/MobileGL/MG_Test/SanityTest.cpp
index c0ea526e..3c6d100c 100644
--- a/MobileGL/MG_Test/SanityTest.cpp
+++ b/MobileGL/MG_Test/SanityTest.cpp
@@ -1374,7 +1374,10 @@ TEST(DirectVulkanSanity, SpirvStorageImageFormatsMapToVulkanFormats) {
         {SpvImageFormatR11fG11fB10f, VK_FORMAT_B10G11R11_UFLOAT_PACK32},
         {SpvImageFormatR16f, VK_FORMAT_R16_SFLOAT},
         {SpvImageFormatRgba16, VK_FORMAT_R16G16B16A16_UNORM},
-        {SpvImageFormatRgb10A2, VK_FORMAT_A2R10G10B10_UNORM_PACK32},
+        // A2**B**10G10R10, matching MGToVk::ConvertTextureInternalFormatToVkFormat's RGB10A2:
+        // the view format and the image format have to name the same bit layout, and
+        // GL_UNSIGNED_INT_2_10_10_10_REV is A2B10G10R10. A2R10G10B10 transposes R and B.
+        {SpvImageFormatRgb10A2, VK_FORMAT_A2B10G10R10_UNORM_PACK32},
         {SpvImageFormatRg16, VK_FORMAT_R16G16_UNORM},
         {SpvImageFormatRg8, VK_FORMAT_R8G8_UNORM},
         {SpvImageFormatR16, VK_FORMAT_R16_UNORM},
@@ -1397,7 +1400,7 @@ TEST(DirectVulkanSanity, SpirvStorageImageFormatsMapToVulkanFormats) {
         {SpvImageFormatRgba16ui, VK_FORMAT_R16G16B16A16_UINT},
         {SpvImageFormatRgba8ui, VK_FORMAT_R8G8B8A8_UINT},
         {SpvImageFormatR32ui, VK_FORMAT_R32_UINT},
-        {SpvImageFormatRgb10a2ui, VK_FORMAT_A2R10G10B10_UINT_PACK32},
+        {SpvImageFormatRgb10a2ui, VK_FORMAT_A2B10G10R10_UINT_PACK32},
         {SpvImageFormatRg32ui, VK_FORMAT_R32G32_UINT},
         {SpvImageFormatRg16ui, VK_FORMAT_R16G16_UINT},
         {SpvImageFormatRg8ui, VK_FORMAT_R8G8_UINT},
diff --git a/MobileGL/MG_Util/Converters/MGToVk/TextureEnumConverter.cpp b/MobileGL/MG_Util/Converters/MGToVk/TextureEnumConverter.cpp
index ab57de7f..c36069ec 100644
--- a/MobileGL/MG_Util/Converters/MGToVk/TextureEnumConverter.cpp
+++ b/MobileGL/MG_Util/Converters/MGToVk/TextureEnumConverter.cpp
@@ -287,9 +287,17 @@ namespace MobileGL {
             case TexturePixelDataType::UnsignedInt8888Rev:
                 return VK_FORMAT_R8G8B8A8_UINT;
             case TexturePixelDataType::UnsignedInt1010102:
-                return VK_FORMAT_A2R10G10B10_UINT_PACK32;
+                // GL_UNSIGNED_INT_10_10_10_2 is R in bits 22-31, G 12-21, B 2-11, A 0-1 - an
+                // R10G10B10A2 packing Vulkan has no format for at all. Reported as UNDEFINED
+                // rather than as the A2*10*10*10 neighbours below, which are a different
+                // packing: naming one of those would hand a caller a format whose components
+                // sit in the wrong bits.
+                return VK_FORMAT_UNDEFINED;
             case TexturePixelDataType::UnsignedInt2101010Rev:
-                return VK_FORMAT_A2R10G10B10_UINT_PACK32;
+                // A2**B**10G10R10, for the reason spelled out on
+                // ConvertTextureInternalFormatToVkFormat's RGB10A2: _REV puts R in bits 0-9,
+                // which is A2B10G10R10. A2R10G10B10 silently swaps R and B.
+                return VK_FORMAT_A2B10G10R10_UINT_PACK32;
             case TexturePixelDataType::UnsignedInt101111Rev:
                 return VK_FORMAT_B10G11R11_UFLOAT_PACK32;
             case TexturePixelDataType::UnsignedInt5999Rev: