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1 /* | 1 /* |
2 * Copyright 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #import "RTCShader.h" | 11 #import "RTCShader.h" |
12 | 12 |
13 #include <vector> | 13 #include <vector> |
14 | 14 |
15 #import "RTCShader+Private.h" | 15 #import "RTCShader+Private.h" |
16 #import "WebRTC/RTCVideoFrame.h" | 16 #import "WebRTC/RTCVideoFrame.h" |
17 | 17 |
18 #include "webrtc/base/optional.h" | |
19 | |
18 // |kNumTextures| must not exceed 8, which is the limit in OpenGLES2. Two sets | 20 // |kNumTextures| must not exceed 8, which is the limit in OpenGLES2. Two sets |
19 // of 3 textures are used here, one for each of the Y, U and V planes. Having | 21 // of 3 textures are used here, one for each of the Y, U and V planes. Having |
20 // two sets alleviates CPU blockage in the event that the GPU is asked to render | 22 // two sets alleviates CPU blockage in the event that the GPU is asked to render |
21 // to a texture that is already in use. | 23 // to a texture that is already in use. |
22 static const GLsizei kNumTextureSets = 2; | 24 static const GLsizei kNumTextureSets = 2; |
23 static const GLsizei kNumTexturesPerSet = 3; | 25 static const GLsizei kNumTexturesPerSet = 3; |
24 static const GLsizei kNumTextures = kNumTexturesPerSet * kNumTextureSets; | 26 static const GLsizei kNumTextures = kNumTexturesPerSet * kNumTextureSets; |
25 | 27 |
26 // Fragment shader converts YUV values from input textures into a final RGB | 28 // Fragment shader converts YUV values from input textures into a final RGB |
27 // pixel. The conversion formula is from http://www.fourcc.org/fccyvrgb.php. | 29 // pixel. The conversion formula is from http://www.fourcc.org/fccyvrgb.php. |
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50 BOOL _hasUnpackRowLength; | 52 BOOL _hasUnpackRowLength; |
51 GLint _currentTextureSet; | 53 GLint _currentTextureSet; |
52 // Handles for OpenGL constructs. | 54 // Handles for OpenGL constructs. |
53 GLuint _textures[kNumTextures]; | 55 GLuint _textures[kNumTextures]; |
54 GLuint _i420Program; | 56 GLuint _i420Program; |
55 GLuint _vertexArray; | 57 GLuint _vertexArray; |
56 GLuint _vertexBuffer; | 58 GLuint _vertexBuffer; |
57 GLint _ySampler; | 59 GLint _ySampler; |
58 GLint _uSampler; | 60 GLint _uSampler; |
59 GLint _vSampler; | 61 GLint _vSampler; |
62 // Store current rotation and only upload new vertex data when rotation | |
63 // changes. | |
64 rtc::Optional<int> _current_rotation; | |
tkchin_webrtc
2016/08/08 22:58:45
nit: camelcase for objc files
_currentRotation
magjed_webrtc
2016/08/09 13:54:27
Done.
| |
60 // Used to create a non-padded plane for GPU upload when we receive padded | 65 // Used to create a non-padded plane for GPU upload when we receive padded |
61 // frames. | 66 // frames. |
62 std::vector<uint8_t> _planeBuffer; | 67 std::vector<uint8_t> _planeBuffer; |
63 } | 68 } |
64 | 69 |
65 - (instancetype)initWithContext:(GlContextType *)context { | 70 - (instancetype)initWithContext:(GlContextType *)context { |
66 if (self = [super init]) { | 71 if (self = [super init]) { |
67 #if TARGET_OS_IPHONE | 72 #if TARGET_OS_IPHONE |
68 _hasUnpackRowLength = (context.API == kEAGLRenderingAPIOpenGLES3); | 73 _hasUnpackRowLength = (context.API == kEAGLRenderingAPIOpenGLES3); |
69 #else | 74 #else |
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112 | 117 |
113 - (BOOL)drawFrame:(RTCVideoFrame*)frame { | 118 - (BOOL)drawFrame:(RTCVideoFrame*)frame { |
114 glUseProgram(_i420Program); | 119 glUseProgram(_i420Program); |
115 if (![self updateTextureDataForFrame:frame]) { | 120 if (![self updateTextureDataForFrame:frame]) { |
116 return NO; | 121 return NO; |
117 } | 122 } |
118 #if !TARGET_OS_IPHONE | 123 #if !TARGET_OS_IPHONE |
119 glBindVertexArray(_vertexArray); | 124 glBindVertexArray(_vertexArray); |
120 #endif | 125 #endif |
121 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); | 126 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); |
127 if (!_current_rotation || frame.rotation != *_current_rotation) { | |
128 _current_rotation = rtc::Optional<int>(frame.rotation); | |
129 RTCSetVertexData(frame.rotation); | |
130 } | |
122 glDrawArrays(GL_TRIANGLE_FAN, 0, 4); | 131 glDrawArrays(GL_TRIANGLE_FAN, 0, 4); |
123 | 132 |
124 return YES; | 133 return YES; |
125 } | 134 } |
126 | 135 |
127 - (void)uploadPlane:(const uint8_t *)plane | 136 - (void)uploadPlane:(const uint8_t *)plane |
128 sampler:(GLint)sampler | 137 sampler:(GLint)sampler |
129 offset:(GLint)offset | 138 offset:(GLint)offset |
130 width:(size_t)width | 139 width:(size_t)width |
131 height:(size_t)height | 140 height:(size_t)height |
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202 offset:textureOffset + 2 | 211 offset:textureOffset + 2 |
203 width:frame.chromaWidth | 212 width:frame.chromaWidth |
204 height:frame.chromaHeight | 213 height:frame.chromaHeight |
205 stride:frame.vPitch]; | 214 stride:frame.vPitch]; |
206 | 215 |
207 _currentTextureSet = (_currentTextureSet + 1) % kNumTextureSets; | 216 _currentTextureSet = (_currentTextureSet + 1) % kNumTextureSets; |
208 return YES; | 217 return YES; |
209 } | 218 } |
210 | 219 |
211 @end | 220 @end |
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