iOS: Add interface for injecting custom shaders

webrtc/sdk/objc/Framework/Classes/RTCI420Shader.mm

Index: webrtc/sdk/objc/Framework/Classes/RTCI420Shader.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/RTCI420Shader.mm b/webrtc/sdk/objc/Framework/Classes/RTCI420Shader.mm
deleted file mode 100644
index 83ecbe4d677009d0ee567562e6ee7fb9c0b1d804..0000000000000000000000000000000000000000
--- a/webrtc/sdk/objc/Framework/Classes/RTCI420Shader.mm
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#import "RTCShader.h"
-
-#import "RTCI420TextureCache.h"
-#import "RTCShader+Private.h"
-#import "WebRTC/RTCLogging.h"
-#import "WebRTC/RTCVideoFrame.h"
-
-#include "webrtc/base/optional.h"
-
-// Fragment shader converts YUV values from input textures into a final RGB
-// pixel. The conversion formula is from http://www.fourcc.org/fccyvrgb.php.
-static const char kI420FragmentShaderSource[] =
-  SHADER_VERSION
-  "precision highp float;"
-  FRAGMENT_SHADER_IN " vec2 v_texcoord;\n"
-  "uniform lowp sampler2D s_textureY;\n"
-  "uniform lowp sampler2D s_textureU;\n"
-  "uniform lowp sampler2D s_textureV;\n"
-  FRAGMENT_SHADER_OUT
-  "void main() {\n"
-  "    float y, u, v, r, g, b;\n"
-  "    y = " FRAGMENT_SHADER_TEXTURE "(s_textureY, v_texcoord).r;\n"
-  "    u = " FRAGMENT_SHADER_TEXTURE "(s_textureU, v_texcoord).r;\n"
-  "    v = " FRAGMENT_SHADER_TEXTURE "(s_textureV, v_texcoord).r;\n"
-  "    u = u - 0.5;\n"
-  "    v = v - 0.5;\n"
-  "    r = y + 1.403 * v;\n"
-  "    g = y - 0.344 * u - 0.714 * v;\n"
-  "    b = y + 1.770 * u;\n"
-  "    " FRAGMENT_SHADER_COLOR " = vec4(r, g, b, 1.0);\n"
-  "  }\n";
-
-@implementation RTCI420Shader {
-  RTCI420TextureCache* textureCache;
-  // Handles for OpenGL constructs.
-  GLuint _i420Program;
-  GLuint _vertexArray;
-  GLuint _vertexBuffer;
-  GLint _ySampler;
-  GLint _uSampler;
-  GLint _vSampler;
-  // Store current rotation and only upload new vertex data when rotation
-  // changes.
-  rtc::Optional<RTCVideoRotation> _currentRotation;
-}
-
-- (instancetype)initWithContext:(GlContextType *)context {
-  if (self = [super init]) {
-    textureCache = [[RTCI420TextureCache alloc] initWithContext:context];
-    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    if (![self setupI420Program] ||
-        !RTCSetupVerticesForProgram(_i420Program, &_vertexBuffer, &_vertexArray)) {
-      RTCLog(@"Failed to initialize RTCI420Shader.");
-      self = nil;
-    }
-  }
-  return self;
-}
-
-- (void)dealloc {
-  glDeleteProgram(_i420Program);
-  glDeleteBuffers(1, &_vertexBuffer);
-  glDeleteVertexArrays(1, &_vertexArray);
-}
-
-- (BOOL)setupI420Program {
-  _i420Program = RTCCreateProgramFromFragmentSource(kI420FragmentShaderSource);
-  if (!_i420Program) {
-    return NO;
-  }
-  _ySampler = glGetUniformLocation(_i420Program, "s_textureY");
-  _uSampler = glGetUniformLocation(_i420Program, "s_textureU");
-  _vSampler = glGetUniformLocation(_i420Program, "s_textureV");
-
-  return (_ySampler >= 0 && _uSampler >= 0 && _vSampler >= 0);
-}
-
-- (BOOL)drawFrame:(RTCVideoFrame*)frame {
-  glUseProgram(_i420Program);
-
-  [textureCache uploadFrameToTextures:frame];
-
-#if !TARGET_OS_IPHONE
-  glBindVertexArray(_vertexArray);
-#endif
-
-  glActiveTexture(GL_TEXTURE0);
-  glBindTexture(GL_TEXTURE_2D, textureCache.yTexture);
-  glUniform1i(_ySampler, 0);
-
-  glActiveTexture(GL_TEXTURE1);
-  glBindTexture(GL_TEXTURE_2D, textureCache.uTexture);
-  glUniform1i(_uSampler, 1);
-
-  glActiveTexture(GL_TEXTURE2);
-  glBindTexture(GL_TEXTURE_2D, textureCache.vTexture);
-  glUniform1i(_vSampler, 2);
-
-  glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
-  if (!_currentRotation || frame.rotation != *_currentRotation) {
-    _currentRotation = rtc::Optional<RTCVideoRotation>(frame.rotation);
-    RTCSetVertexData(*_currentRotation);
-  }
-  glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
-
-  return YES;
-}
-
-@end