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| 1 /* | |
| 2 * Copyright 2016 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 #import "RTCShader.h" | |
| 12 | |
| 13 #include <algorithm> | |
| 14 #include <array> | |
| 15 #include <memory> | |
| 16 | |
| 17 #import "RTCShader+Private.h" | |
| 18 | |
| 19 #include "webrtc/base/checks.h" | |
| 20 #include "webrtc/base/logging.h" | |
| 21 | |
| 22 // Vertex shader doesn't do anything except pass coordinates through. | |
| 23 const char kRTCVertexShaderSource[] = | |
| 24 SHADER_VERSION | |
| 25 VERTEX_SHADER_IN " vec2 position;\n" | |
| 26 VERTEX_SHADER_IN " vec2 texcoord;\n" | |
| 27 VERTEX_SHADER_OUT " vec2 v_texcoord;\n" | |
| 28 "void main() {\n" | |
| 29 " gl_Position = vec4(position.x, position.y, 0.0, 1.0);\n" | |
| 30 " v_texcoord = texcoord;\n" | |
| 31 "}\n"; | |
| 32 | |
| 33 // Compiles a shader of the given |type| with GLSL source |source| and returns | |
| 34 // the shader handle or 0 on error. | |
| 35 GLuint RTCCreateShader(GLenum type, const GLchar *source) { | |
| 36 GLuint shader = glCreateShader(type); | |
| 37 if (!shader) { | |
| 38 return 0; | |
| 39 } | |
| 40 glShaderSource(shader, 1, &source, NULL); | |
| 41 glCompileShader(shader); | |
| 42 GLint compileStatus = GL_FALSE; | |
| 43 glGetShaderiv(shader, GL_COMPILE_STATUS, &compileStatus); | |
| 44 if (compileStatus == GL_FALSE) { | |
| 45 GLint logLength = 0; | |
| 46 // The null termination character is included in the returned log length. | |
| 47 glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength); | |
| 48 if (logLength > 0) { | |
| 49 std::unique_ptr<char[]> compileLog(new char[logLength]); | |
| 50 // The returned string is null terminated. | |
| 51 glGetShaderInfoLog(shader, logLength, NULL, compileLog.get()); | |
| 52 LOG(LS_ERROR) << "Shader compile error: " << compileLog.get(); | |
| 53 } | |
| 54 glDeleteShader(shader); | |
| 55 shader = 0; | |
| 56 } | |
| 57 return shader; | |
| 58 } | |
| 59 | |
| 60 // Links a shader program with the given vertex and fragment shaders and | |
| 61 // returns the program handle or 0 on error. | |
| 62 GLuint RTCCreateProgram(GLuint vertexShader, GLuint fragmentShader) { | |
| 63 if (vertexShader == 0 || fragmentShader == 0) { | |
| 64 return 0; | |
| 65 } | |
| 66 GLuint program = glCreateProgram(); | |
| 67 if (!program) { | |
| 68 return 0; | |
| 69 } | |
| 70 glAttachShader(program, vertexShader); | |
| 71 glAttachShader(program, fragmentShader); | |
| 72 glLinkProgram(program); | |
| 73 GLint linkStatus = GL_FALSE; | |
| 74 glGetProgramiv(program, GL_LINK_STATUS, &linkStatus); | |
| 75 if (linkStatus == GL_FALSE) { | |
| 76 glDeleteProgram(program); | |
| 77 program = 0; | |
| 78 } | |
| 79 return program; | |
| 80 } | |
| 81 | |
| 82 // Creates and links a shader program with the given fragment shader source and | |
| 83 // a plain vertex shader. Returns the program handle or 0 on error. | |
| 84 GLuint RTCCreateProgramFromFragmentSource(const char fragmentShaderSource[]) { | |
| 85 GLuint vertexShader = RTCCreateShader(GL_VERTEX_SHADER, kRTCVertexShaderSource
); | |
| 86 RTC_CHECK(vertexShader) << "failed to create vertex shader"; | |
| 87 GLuint fragmentShader = | |
| 88 RTCCreateShader(GL_FRAGMENT_SHADER, fragmentShaderSource); | |
| 89 RTC_CHECK(fragmentShader) << "failed to create fragment shader"; | |
| 90 GLuint program = RTCCreateProgram(vertexShader, fragmentShader); | |
| 91 // Shaders are created only to generate program. | |
| 92 if (vertexShader) { | |
| 93 glDeleteShader(vertexShader); | |
| 94 } | |
| 95 if (fragmentShader) { | |
| 96 glDeleteShader(fragmentShader); | |
| 97 } | |
| 98 return program; | |
| 99 } | |
| 100 | |
| 101 // Set vertex shader variables 'position' and 'texcoord' in |program| to use | |
| 102 // |vertexBuffer| and |vertexArray| to store the vertex data. | |
| 103 BOOL RTCSetupVerticesForProgram(GLuint program, GLuint* vertexBuffer, GLuint* ve
rtexArray) { | |
| 104 GLint position = glGetAttribLocation(program, "position"); | |
| 105 GLint texcoord = glGetAttribLocation(program, "texcoord"); | |
| 106 if (position < 0 || texcoord < 0) { | |
| 107 return NO; | |
| 108 } | |
| 109 #if !TARGET_OS_IPHONE | |
| 110 glGenVertexArrays(1, vertexArray); | |
| 111 if (*vertexArray == 0) { | |
| 112 return NO; | |
| 113 } | |
| 114 glBindVertexArray(*vertexArray); | |
| 115 #endif | |
| 116 glGenBuffers(1, vertexBuffer); | |
| 117 if (*vertexBuffer == 0) { | |
| 118 return NO; | |
| 119 } | |
| 120 glBindBuffer(GL_ARRAY_BUFFER, *vertexBuffer); | |
| 121 glBufferData(GL_ARRAY_BUFFER, 4 * 4 * sizeof(GLfloat), NULL, GL_DYNAMIC_DRAW); | |
| 122 | |
| 123 // Read position attribute with size of 2 and stride of 4 beginning at the | |
| 124 // start of the array. The last argument indicates offset of data within the | |
| 125 // vertex buffer. | |
| 126 glVertexAttribPointer(position, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), | |
| 127 (void *)0); | |
| 128 glEnableVertexAttribArray(position); | |
| 129 | |
| 130 // Read texcoord attribute from |gVertices| with size of 2 and stride of 4 | |
| 131 // beginning at the first texcoord in the array. The last argument indicates | |
| 132 // offset of data within |gVertices| as supplied to the vertex buffer. | |
| 133 glVertexAttribPointer(texcoord, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), | |
| 134 (void *)(2 * sizeof(GLfloat))); | |
| 135 glEnableVertexAttribArray(texcoord); | |
| 136 | |
| 137 return YES; | |
| 138 } | |
| 139 | |
| 140 // Set vertex data to the currently bound vertex buffer. | |
| 141 void RTCSetVertexData(RTCVideoRotation rotation) { | |
| 142 // When modelview and projection matrices are identity (default) the world is | |
| 143 // contained in the square around origin with unit size 2. Drawing to these | |
| 144 // coordinates is equivalent to drawing to the entire screen. The texture is | |
| 145 // stretched over that square using texture coordinates (u, v) that range | |
| 146 // from (0, 0) to (1, 1) inclusive. Texture coordinates are flipped vertically | |
| 147 // here because the incoming frame has origin in upper left hand corner but | |
| 148 // OpenGL expects origin in bottom left corner. | |
| 149 std::array<std::array<GLfloat, 2>, 4> UVCoords = {{ | |
| 150 {{0, 1}}, // Lower left. | |
| 151 {{1, 1}}, // Lower right. | |
| 152 {{1, 0}}, // Upper right. | |
| 153 {{0, 0}}, // Upper left. | |
| 154 }}; | |
| 155 | |
| 156 // Rotate the UV coordinates. | |
| 157 int rotation_offset; | |
| 158 switch (rotation) { | |
| 159 case RTCVideoRotation_0: | |
| 160 rotation_offset = 0; | |
| 161 break; | |
| 162 case RTCVideoRotation_90: | |
| 163 rotation_offset = 1; | |
| 164 break; | |
| 165 case RTCVideoRotation_180: | |
| 166 rotation_offset = 2; | |
| 167 break; | |
| 168 case RTCVideoRotation_270: | |
| 169 rotation_offset = 3; | |
| 170 break; | |
| 171 } | |
| 172 std::rotate(UVCoords.begin(), UVCoords.begin() + rotation_offset, | |
| 173 UVCoords.end()); | |
| 174 | |
| 175 const GLfloat gVertices[] = { | |
| 176 // X, Y, U, V. | |
| 177 -1, -1, UVCoords[0][0], UVCoords[0][1], | |
| 178 1, -1, UVCoords[1][0], UVCoords[1][1], | |
| 179 1, 1, UVCoords[2][0], UVCoords[2][1], | |
| 180 -1, 1, UVCoords[3][0], UVCoords[3][1], | |
| 181 }; | |
| 182 | |
| 183 glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(gVertices), gVertices); | |
| 184 } | |
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Issue 2893593002:
Revert of Split iOS sdk in to separate targets (Closed)
