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Add texture support for macOS shell. (#8507)
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34 changes: 34 additions & 0 deletions
34
shell/platform/darwin/macos/framework/Source/FlutterExternalTextureGL.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| // 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 <Foundation/Foundation.h> | ||
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| #import "flutter/shell/platform/darwin/common/framework/Headers/FlutterTexture.h" | ||
| #import "flutter/shell/platform/embedder/embedder.h" | ||
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| /** | ||
| * Used to bridge FlutterTexture object and handle the texture copy request the | ||
| * Flutter engine. | ||
| */ | ||
| @interface FlutterExternalTextureGL : NSObject | ||
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| /** | ||
| * Initializes a texture adapter with |texture| return a instance. | ||
| */ | ||
| - (nonnull instancetype)initWithFlutterTexture:(nonnull id<FlutterTexture>)texture; | ||
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| /** | ||
| * Accepts texture buffer copy request from the Flutter engine. | ||
| * When the user side marks the textureID as available, the Flutter engine will | ||
| * callback to this method and ask for populate the |openGLTexture| object, | ||
| * such as the texture type and the format of the pixel buffer and the texture object. | ||
| */ | ||
| - (BOOL)populateTexture:(nonnull FlutterOpenGLTexture*)openGLTexture; | ||
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| /** | ||
| * Returns the ID for the FlutterTexture instance. | ||
| */ | ||
| - (int64_t)textureID; | ||
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| @end |
85 changes: 85 additions & 0 deletions
85
shell/platform/darwin/macos/framework/Source/FlutterExternalTextureGL.mm
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // 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/FlutterExternalTextureGL.h" | ||
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| #import <AppKit/AppKit.h> | ||
| #import <CoreVideo/CoreVideo.h> | ||
| #import <OpenGL/gl.h> | ||
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| static void OnCVOpenGLTextureRelease(CVOpenGLTextureRef cvOpenGLTexture) { | ||
| CVOpenGLTextureRelease(cvOpenGLTexture); | ||
| } | ||
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| @implementation FlutterExternalTextureGL { | ||
| /** | ||
| * OpenGL texture cache. | ||
| */ | ||
| CVOpenGLTextureCacheRef _openGLTextureCache; | ||
| /** | ||
| * User side texture object, used to copy pixel buffer. | ||
| */ | ||
| id<FlutterTexture> _texture; | ||
| } | ||
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| - (instancetype)initWithFlutterTexture:(id<FlutterTexture>)texture { | ||
| self = [super init]; | ||
| if (self) { | ||
| _texture = texture; | ||
| } | ||
| return self; | ||
| } | ||
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| - (int64_t)textureID { | ||
| return reinterpret_cast<int64_t>(self); | ||
| } | ||
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| - (BOOL)populateTexture:(FlutterOpenGLTexture*)openGLTexture { | ||
| // Copy the pixel buffer from the FlutterTexture instance implemented on the user side. | ||
| CVPixelBufferRef pixelBuffer = [_texture copyPixelBuffer]; | ||
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| if (!pixelBuffer) { | ||
| return NO; | ||
| } | ||
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| // Create the opengl texture cache if necessary. | ||
| if (!_openGLTextureCache) { | ||
| CGLContextObj context = [NSOpenGLContext currentContext].CGLContextObj; | ||
| CGLPixelFormatObj format = CGLGetPixelFormat(context); | ||
| if (CVOpenGLTextureCacheCreate(kCFAllocatorDefault, NULL, context, format, NULL, | ||
| &_openGLTextureCache) != kCVReturnSuccess) { | ||
| NSLog(@"Could not create texture cache."); | ||
| CVPixelBufferRelease(pixelBuffer); | ||
| return NO; | ||
| } | ||
| } | ||
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| // Try to clear the cache of OpenGL textures to save memory. | ||
| CVOpenGLTextureCacheFlush(_openGLTextureCache, 0); | ||
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| CVOpenGLTextureRef cvOpenGLTexture = NULL; | ||
| if (CVOpenGLTextureCacheCreateTextureFromImage(kCFAllocatorDefault, _openGLTextureCache, | ||
| pixelBuffer, NULL, | ||
| &cvOpenGLTexture) != kCVReturnSuccess) { | ||
| CVPixelBufferRelease(pixelBuffer); | ||
| return NO; | ||
| } | ||
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| openGLTexture->target = static_cast<uint32_t>(CVOpenGLTextureGetTarget(cvOpenGLTexture)); | ||
| openGLTexture->name = static_cast<uint32_t>(CVOpenGLTextureGetName(cvOpenGLTexture)); | ||
| openGLTexture->format = static_cast<uint32_t>(GL_RGBA8); | ||
| openGLTexture->destruction_callback = (VoidCallback)OnCVOpenGLTextureRelease; | ||
| openGLTexture->user_data = cvOpenGLTexture; | ||
| openGLTexture->width = CVPixelBufferGetWidth(pixelBuffer); | ||
| openGLTexture->height = CVPixelBufferGetHeight(pixelBuffer); | ||
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| CVPixelBufferRelease(pixelBuffer); | ||
| return YES; | ||
| } | ||
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| - (void)dealloc { | ||
| CVOpenGLTextureCacheRelease(_openGLTextureCache); | ||
| } | ||
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| @end |
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