GPU: refactor vendor detection code

src/detection/gpu/gpu.c

@@ -2,15 +2,41 @@
 #include "detection/internal.h"
 #include "detection/vulkan.h"
 
-void ffDetectGPUImpl(FFlist* gpus, const FFinstance* instance);
+const char* ffDetectGPUImpl(FFlist* gpus, const FFinstance* instance);
+
+const char* FF_GPU_VENDOR_NAME_APPLE = "Apple";
+const char* FF_GPU_VENDOR_NAME_AMD = "AMD";
+const char* FF_GPU_VENDOR_NAME_INTEL = "Intel";
+const char* FF_GPU_VENDOR_NAME_NVIDIA = "NVIDIA";
+
+static inline bool arrayContains(const unsigned arr[], unsigned vendorId, unsigned length)
+{
+    for (unsigned i = 0; i < length; ++i)
+    {
+        if (arr[i] == vendorId)
+            return true;
+    }
+    return false;
+}
+
+const char* ffGetGPUVendorString(unsigned vendorId)
+{
+    if(vendorId == 0x106b)
+        return FF_GPU_VENDOR_NAME_APPLE;
+    if(arrayContains((const unsigned[]) {0x1002, 0x1022}, vendorId, 2))
+        return FF_GPU_VENDOR_NAME_AMD;
+    else if(arrayContains((const unsigned[]) {0x03e7, 0x8086, 0x8087}, vendorId, 3))
+        return FF_GPU_VENDOR_NAME_INTEL;
+    else if(arrayContains((const unsigned[]) {0x0955, 0x10de, 0x12d2}, vendorId, 3))
+        return FF_GPU_VENDOR_NAME_NVIDIA;
+    return NULL;
+}
 
 const FFlist* ffDetectGPU(const FFinstance* instance)
 {
     FF_DETECTION_INTERNAL_GUARD(FFlist,
         ffListInit(&result, sizeof(FFGPUResult));
-        ffDetectGPUImpl(&result, instance);
-
-        if(result.length == 0)
+        if(ffDetectGPUImpl(&result, instance) != NULL)
         {
             const FFVulkanResult* vulkan = ffDetectVulkan(instance);
             result = vulkan->gpus;