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devdraw: prefer low-power GPU for macOS metal rendering (#231)

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This commit is contained in:
Chris Schultz 2019-04-05 14:08:20 -05:00 • committed by Russ Cox
parent 26c6b25795
commit 6160158729
1 changed files with 13 additions and 2 deletions
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11
src/cmd/devdraw/cocoa-screen-metal.m
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@ -153,6 +153,7 @@ threadmain(int argc, char **argv)
id<MTLLibrary> library;
MTLRenderPipelineDescriptor *pipelineDesc;
NSError *error;
NSArray *allDevices;
const NSWindowStyleMask Winstyle = NSWindowStyleMaskTitled
| NSWindowStyleMaskClosable
@ -198,7 +199,17 @@ threadmain(int argc, char **argv)
[myContent setWantsLayer:YES];
[myContent setLayerContentsRedrawPolicy:NSViewLayerContentsRedrawOnSetNeedsDisplay];
device = nil;
allDevices = MTLCopyAllDevices();
for(id mtlDevice in allDevices) {
if ([mtlDevice isLowPower] && ![mtlDevice isRemovable]) {
device = mtlDevice;
break;
}
}
if(!device)
device = MTLCreateSystemDefaultDevice();
commandQueue = [device newCommandQueue];
layer = (DrawLayer *)[myContent layer];