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Create a wrapper for IOSurface to handle creation and (flutter#22663)
binding IOSurfaces to textures / framebuffers.
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29 changes: 29 additions & 0 deletions
29
shell/platform/darwin/macos/framework/Source/FlutterIOSurfaceHolder.h
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| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #import <Cocoa/Cocoa.h> | ||
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| /** | ||
| * FlutterIOSurfaceHolder maintains an IOSurface | ||
| * and provides an interface to bind the IOSurface to a texture. | ||
| */ | ||
| @interface FlutterIOSurfaceHolder : NSObject | ||
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| /** | ||
| * Bind the IOSurface to the provided texture and fbo. | ||
| */ | ||
| - (void)bindSurfaceToTexture:(GLuint)texture fbo:(GLuint)fbo size:(CGSize)size; | ||
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| /** | ||
| * Releases the current IOSurface if one exists | ||
| * and creates a new IOSurface with the specified size. | ||
| */ | ||
| - (void)recreateIOSurfaceWithSize:(CGSize)size; | ||
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| /** | ||
| * Returns a reference to the underlying IOSurface. | ||
| */ | ||
| - (const IOSurfaceRef&)ioSurface; | ||
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| @end |
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shell/platform/darwin/macos/framework/Source/FlutterIOSurfaceHolder.mm
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| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterIOSurfaceHolder.h" | ||
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| #include <OpenGL/gl.h> | ||
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| @interface FlutterIOSurfaceHolder () { | ||
| IOSurfaceRef _ioSurface; | ||
| } | ||
| @end | ||
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| @implementation FlutterIOSurfaceHolder | ||
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| - (void)bindSurfaceToTexture:(GLuint)texture fbo:(GLuint)fbo size:(CGSize)size { | ||
| [self recreateIOSurfaceWithSize:size]; | ||
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| glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texture); | ||
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| CGLTexImageIOSurface2D(CGLGetCurrentContext(), GL_TEXTURE_RECTANGLE_ARB, GL_RGBA, int(size.width), | ||
| int(size.height), GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, _ioSurface, | ||
| 0 /* plane */); | ||
| glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0); | ||
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| glBindFramebuffer(GL_FRAMEBUFFER, fbo); | ||
| glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE_ARB, texture, | ||
| 0); | ||
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| NSAssert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE, | ||
| @"Framebuffer status check failed"); | ||
| } | ||
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| - (void)recreateIOSurfaceWithSize:(CGSize)size { | ||
| if (_ioSurface) { | ||
| CFRelease(_ioSurface); | ||
| } | ||
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| unsigned pixelFormat = 'BGRA'; | ||
| unsigned bytesPerElement = 4; | ||
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| size_t bytesPerRow = IOSurfaceAlignProperty(kIOSurfaceBytesPerRow, size.width * bytesPerElement); | ||
| size_t totalBytes = IOSurfaceAlignProperty(kIOSurfaceAllocSize, size.height * bytesPerRow); | ||
| NSDictionary* options = @{ | ||
| (id)kIOSurfaceWidth : @(size.width), | ||
| (id)kIOSurfaceHeight : @(size.height), | ||
| (id)kIOSurfacePixelFormat : @(pixelFormat), | ||
| (id)kIOSurfaceBytesPerElement : @(bytesPerElement), | ||
| (id)kIOSurfaceBytesPerRow : @(bytesPerRow), | ||
| (id)kIOSurfaceAllocSize : @(totalBytes), | ||
| }; | ||
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| _ioSurface = IOSurfaceCreate((CFDictionaryRef)options); | ||
| } | ||
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| - (const IOSurfaceRef&)ioSurface { | ||
| return _ioSurface; | ||
| } | ||
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| - (void)dealloc { | ||
| if (_ioSurface) { | ||
| CFRelease(_ioSurface); | ||
| } | ||
| } | ||
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| @end |
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