104 lines
3.5 KiB
Objective-C
104 lines
3.5 KiB
Objective-C
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "MPPLayerRenderer.h"
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@implementation MPPLayerRenderer {
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/// Used for rendering to a CAEAGLLayer.
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MPPGLViewRenderer *_glRenderer;
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/// Used for rendering.
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GLuint framebuffer_;
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GLuint renderbuffer_;
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}
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- (instancetype)init {
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self = [super init];
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if (self) {
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_layer = [[CAEAGLLayer alloc] init];
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// The default drawable properties are ok.
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_layer.opaque = YES;
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// Synchronizes presentation with CoreAnimation transactions.
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// Avoids desync between GL and CA updates.
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// TODO: should this be on by default? It's not on in GLKView,
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// but if we add support for AVSampleBufferDisplayLayer we may want to
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// make sure the behavior is similar.
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if ([_layer respondsToSelector:@selector(setPresentsWithTransaction:)]) {
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_layer.presentsWithTransaction = YES;
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}
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_layer.contentsScale = [[UIScreen mainScreen] scale];
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_glRenderer = [[MPPGLViewRenderer alloc] init];
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}
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return self;
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}
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- (void)dealloc {
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}
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- (void)setupFrameBuffer {
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[EAGLContext setCurrentContext:_glRenderer.glContext];
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glDisable(GL_DEPTH_TEST);
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glGenFramebuffers(1, &framebuffer_);
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glBindFramebuffer(GL_FRAMEBUFFER, framebuffer_);
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glGenRenderbuffers(1, &renderbuffer_);
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glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer_);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, renderbuffer_);
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BOOL success __unused = [_glRenderer.glContext renderbufferStorage:GL_RENDERBUFFER
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fromDrawable:_layer];
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NSAssert(success, @"could not create renderbuffer storage for layer with bounds %@",
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NSStringFromCGRect(_layer.bounds));
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GLenum status __unused = glCheckFramebufferStatus(GL_FRAMEBUFFER);
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NSAssert(status == GL_FRAMEBUFFER_COMPLETE,
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@"failed to make complete framebuffer object %x", status);
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}
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- (void)renderPixelBuffer:(CVPixelBufferRef)pixelBuffer {
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if (!framebuffer_) {
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[self setupFrameBuffer];
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}
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GLfloat drawWidth = _layer.bounds.size.width * _layer.contentsScale;
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GLfloat drawHeight = _layer.bounds.size.height * _layer.contentsScale;
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[EAGLContext setCurrentContext:_glRenderer.glContext];
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glViewport(0, 0, drawWidth, drawHeight);
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[_glRenderer drawPixelBuffer:pixelBuffer width:drawWidth height:drawHeight];
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BOOL success = [_glRenderer.glContext presentRenderbuffer:GL_RENDERBUFFER];
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if (!success) NSLog(@"presentRenderbuffer failed");
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}
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- (MPPFrameRotation)frameRotationMode {
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return _glRenderer.frameRotationMode;
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}
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- (void)setFrameRotationMode:(MPPFrameRotation)frameRotationMode {
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_glRenderer.frameRotationMode = frameRotationMode;
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}
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- (MPPFrameScaleMode)frameScaleMode {
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return _glRenderer.frameScaleMode;
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}
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- (void)setFrameScaleMode:(MPPFrameScaleMode)frameScaleMode {
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_glRenderer.frameScaleMode = frameScaleMode;
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}
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- (BOOL)mirrored {
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return _glRenderer.mirrored;
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}
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- (void)setMirrored:(BOOL)mirrored {
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_glRenderer.mirrored = mirrored;
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}
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@end
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