[vk] Disable float16 math on non-MESA AMD drivers as 2026+ versions are broken (#3661)

thanks MaranBR

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3661
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Co-authored-by: PavelBARABANOV <pavelbarabanov94@gmail.com>
Co-committed-by: PavelBARABANOV <pavelbarabanov94@gmail.com>

src/video_core/vulkan_common/vulkan_device.cpp

@@ -586,12 +586,20 @@ Device::Device(VkInstance instance_, vk::PhysicalDevice physical_, VkSurfaceKHR
     if (is_amd_driver) {
         // AMD drivers need a higher amount of Sets per Pool in certain circumstances like in XC2.
         sets_per_pool = 96;
+
         // Disable VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT on AMD GCN4 and lower as it is broken.
         if (!features.shader_float16_int8.shaderFloat16) {
             LOG_WARNING(Render_Vulkan,
                         "AMD GCN4 and earlier have broken VK_IMAGE_CREATE_CUBE_COMPATIBLE_BIT");
             has_broken_cube_compatibility = true;
         }
+
+        // AMD drivers (2026+) have broken float16 math on DKCR
+        if (features.shader_float16_int8.shaderFloat16) {
+            LOG_WARNING(Render_Vulkan,
+                        "AMD drivers (2026+) have broken float16 math");
+            features.shader_float16_int8.shaderFloat16 = false;
+        }
     }
 
     if (is_qualcomm) {