1/*
2 *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
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
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_MODULES_VIDEO_RENDER_IOS_OPEN_GLES20_H_
12#define WEBRTC_MODULES_VIDEO_RENDER_IOS_OPEN_GLES20_H_
13
14#include <OpenGLES/ES2/glext.h>
15
16#include "webrtc/modules/video_render/include/video_render_defines.h"
17
18/*
19 * This OpenGles20 is the class of renderer for I420VideoFrame into a GLES 2.0
20 * windows used in the VideoRenderIosView class.
21 */
22namespace webrtc {
23class OpenGles20 {
24 public:
25  OpenGles20();
26  ~OpenGles20();
27
28  bool Setup(int32_t width, int32_t height);
29  bool Render(const I420VideoFrame& frame);
30
31  // SetCoordinates
32  // Sets the coordinates where the stream shall be rendered.
33  // Values must be between 0 and 1.
34  bool SetCoordinates(const float z_order,
35                      const float left,
36                      const float top,
37                      const float right,
38                      const float bottom);
39
40 private:
41  // Compile and load the vertex and fragment shaders defined at the top of
42  // open_gles20.mm
43  GLuint LoadShader(GLenum shader_type, const char* shader_source);
44
45  GLuint CreateProgram(const char* vertex_source, const char* fragment_source);
46
47  // Initialize the textures by the frame width and height
48  void SetupTextures(const I420VideoFrame& frame);
49
50  // Update the textures by the YUV data from the frame
51  void UpdateTextures(const I420VideoFrame& frame);
52
53  GLuint texture_ids_[3];  // Texture id of Y,U and V texture.
54  GLuint program_;
55  GLsizei texture_width_;
56  GLsizei texture_height_;
57
58  GLfloat vertices_[20];
59  static const char indices_[];
60  static const char vertext_shader_[];
61  static const char fragment_shader_[];
62};
63}  // namespace webrtc
64#endif  // WEBRTC_MODULES_VIDEO_RENDER_IOS_OPEN_GLES20_H_
65