Add caps files for metal

Bug: skia:
Change-Id: I8e7488320d4237cf67d6ebeaad319d3de75b67e6
Reviewed-on: https://skia-review.googlesource.com/27741
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 66 insertions, 2 deletions

diff --git a/src/gpu/mtl/GrMtlGpu.mm b/src/gpu/mtl/GrMtlGpu.mm
index 986bb8a6f7..7a9a673d69 100644
--- a/src/gpu/mtl/GrMtlGpu.mm
+++ b/src/gpu/mtl/GrMtlGpu.mm
@@ -11,19 +11,83 @@
 #error This file must be compiled with Arc. Use -fobjc-arc flag
 #endif
 
+static bool get_feature_set(id<MTLDevice> device, MTLFeatureSet* featureSet) {
+    // Mac OSX
+#ifdef SK_BUILD_FOR_MAC
+    if ([device supportsFeatureSet:MTLFeatureSet_OSX_GPUFamily1_v2]) {
+        *featureSet = MTLFeatureSet_OSX_GPUFamily1_v2;
+        return true;
+    }
+    if ([device supportsFeatureSet:MTLFeatureSet_OSX_GPUFamily1_v1]) {
+        *featureSet = MTLFeatureSet_OSX_GPUFamily1_v1;
+        return true;
+    }
+#endif
+
+    // iOS Family group 3
+#ifdef SK_BUILD_FOR_IOS
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily3_v2]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily3_v2;
+        return true;
+    }
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily3_v1]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily3_v1;
+        return true;
+    }
+
+    // iOS Family group 2
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily2_v3]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily2_v3;
+        return true;
+    }
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily2_v2]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily2_v2;
+        return true;
+    }
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily2_v1]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily2_v1;
+        return true;
+    }
+
+    // iOS Family group 1
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily1_v3]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily1_v3;
+        return true;
+    }
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily1_v2]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily1_v2;
+        return true;
+    }
+    if ([device supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily1_v1]) {
+        *featureSet = MTLFeatureSet_iOS_GPUFamily1_v1;
+        return true;
+    }
+#endif
+    // No supported feature sets were found
+    return false;
+}
+
 GrGpu* GrMtlGpu::Create(GrContext* context, const GrContextOptions& options,
                         id<MTLDevice> device, id<MTLCommandQueue> queue) {
     if (!device || !queue) {
         return nullptr;
     }
-    return new GrMtlGpu(context, options, device, queue);
+    MTLFeatureSet featureSet;
+    if (!get_feature_set(device, &featureSet)) {
+        return nullptr;
+    }
+    return new GrMtlGpu(context, options, device, queue, featureSet);
 }
 
 GrMtlGpu::GrMtlGpu(GrContext* context, const GrContextOptions& options,
-                   id<MTLDevice> device, id<MTLCommandQueue> queue)
+                   id<MTLDevice> device, id<MTLCommandQueue> queue, MTLFeatureSet featureSet)
         : INHERITED(context)
         , fDevice(device)
         , fQueue(queue) {
+
+    fMtlCaps.reset(new GrMtlCaps(options, fDevice, featureSet));
+    fCaps = fMtlCaps;
+
     MTLTextureDescriptor* txDesc = [[MTLTextureDescriptor alloc] init];
     txDesc.textureType = MTLTextureType3D;
     txDesc.height = 64;