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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2014 Google Inc. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #if !defined(__has_feature) || !__has_feature(objc_arc) | |
| 29 #error "This file requires ARC support." | |
| 30 #endif | |
| 31 | |
| 32 #import "RTCOpenGLVideoRenderer.h" | |
| 33 | |
| 34 #include <string.h> | |
| 35 | |
| 36 #include <memory> | |
| 37 | |
| 38 #if TARGET_OS_IPHONE | |
| 39 #import <OpenGLES/ES3/gl.h> | |
| 40 #else | |
| 41 #import <OpenGL/gl3.h> | |
| 42 #endif | |
| 43 | |
| 44 #import "RTCI420Frame.h" | |
| 45 | |
| 46 // TODO(tkchin): check and log openGL errors. Methods here return BOOLs in | |
| 47 // anticipation of that happening in the future. | |
| 48 | |
| 49 #if TARGET_OS_IPHONE | |
| 50 #define RTC_PIXEL_FORMAT GL_LUMINANCE | |
| 51 #define SHADER_VERSION | |
| 52 #define VERTEX_SHADER_IN "attribute" | |
| 53 #define VERTEX_SHADER_OUT "varying" | |
| 54 #define FRAGMENT_SHADER_IN "varying" | |
| 55 #define FRAGMENT_SHADER_OUT | |
| 56 #define FRAGMENT_SHADER_COLOR "gl_FragColor" | |
| 57 #define FRAGMENT_SHADER_TEXTURE "texture2D" | |
| 58 #else | |
| 59 #define RTC_PIXEL_FORMAT GL_RED | |
| 60 #define SHADER_VERSION "#version 150\n" | |
| 61 #define VERTEX_SHADER_IN "in" | |
| 62 #define VERTEX_SHADER_OUT "out" | |
| 63 #define FRAGMENT_SHADER_IN "in" | |
| 64 #define FRAGMENT_SHADER_OUT "out vec4 fragColor;\n" | |
| 65 #define FRAGMENT_SHADER_COLOR "fragColor" | |
| 66 #define FRAGMENT_SHADER_TEXTURE "texture" | |
| 67 #endif | |
| 68 | |
| 69 // Vertex shader doesn't do anything except pass coordinates through. | |
| 70 static const char kVertexShaderSource[] = | |
| 71 SHADER_VERSION | |
| 72 VERTEX_SHADER_IN " vec2 position;\n" | |
| 73 VERTEX_SHADER_IN " vec2 texcoord;\n" | |
| 74 VERTEX_SHADER_OUT " vec2 v_texcoord;\n" | |
| 75 "void main() {\n" | |
| 76 " gl_Position = vec4(position.x, position.y, 0.0, 1.0);\n" | |
| 77 " v_texcoord = texcoord;\n" | |
| 78 "}\n"; | |
| 79 | |
| 80 // Fragment shader converts YUV values from input textures into a final RGB | |
| 81 // pixel. The conversion formula is from http://www.fourcc.org/fccyvrgb.php. | |
| 82 static const char kFragmentShaderSource[] = | |
| 83 SHADER_VERSION | |
| 84 "precision highp float;" | |
| 85 FRAGMENT_SHADER_IN " vec2 v_texcoord;\n" | |
| 86 "uniform lowp sampler2D s_textureY;\n" | |
| 87 "uniform lowp sampler2D s_textureU;\n" | |
| 88 "uniform lowp sampler2D s_textureV;\n" | |
| 89 FRAGMENT_SHADER_OUT | |
| 90 "void main() {\n" | |
| 91 " float y, u, v, r, g, b;\n" | |
| 92 " y = " FRAGMENT_SHADER_TEXTURE "(s_textureY, v_texcoord).r;\n" | |
| 93 " u = " FRAGMENT_SHADER_TEXTURE "(s_textureU, v_texcoord).r;\n" | |
| 94 " v = " FRAGMENT_SHADER_TEXTURE "(s_textureV, v_texcoord).r;\n" | |
| 95 " u = u - 0.5;\n" | |
| 96 " v = v - 0.5;\n" | |
| 97 " r = y + 1.403 * v;\n" | |
| 98 " g = y - 0.344 * u - 0.714 * v;\n" | |
| 99 " b = y + 1.770 * u;\n" | |
| 100 " " FRAGMENT_SHADER_COLOR " = vec4(r, g, b, 1.0);\n" | |
| 101 " }\n"; | |
| 102 | |
| 103 // Compiles a shader of the given |type| with GLSL source |source| and returns | |
| 104 // the shader handle or 0 on error. | |
| 105 GLuint CreateShader(GLenum type, const GLchar* source) { | |
| 106 GLuint shader = glCreateShader(type); | |
| 107 if (!shader) { | |
| 108 return 0; | |
| 109 } | |
| 110 glShaderSource(shader, 1, &source, NULL); | |
| 111 glCompileShader(shader); | |
| 112 GLint compileStatus = GL_FALSE; | |
| 113 glGetShaderiv(shader, GL_COMPILE_STATUS, &compileStatus); | |
| 114 if (compileStatus == GL_FALSE) { | |
| 115 glDeleteShader(shader); | |
| 116 shader = 0; | |
| 117 } | |
| 118 return shader; | |
| 119 } | |
| 120 | |
| 121 // Links a shader program with the given vertex and fragment shaders and | |
| 122 // returns the program handle or 0 on error. | |
| 123 GLuint CreateProgram(GLuint vertexShader, GLuint fragmentShader) { | |
| 124 if (vertexShader == 0 || fragmentShader == 0) { | |
| 125 return 0; | |
| 126 } | |
| 127 GLuint program = glCreateProgram(); | |
| 128 if (!program) { | |
| 129 return 0; | |
| 130 } | |
| 131 glAttachShader(program, vertexShader); | |
| 132 glAttachShader(program, fragmentShader); | |
| 133 glLinkProgram(program); | |
| 134 GLint linkStatus = GL_FALSE; | |
| 135 glGetProgramiv(program, GL_LINK_STATUS, &linkStatus); | |
| 136 if (linkStatus == GL_FALSE) { | |
| 137 glDeleteProgram(program); | |
| 138 program = 0; | |
| 139 } | |
| 140 return program; | |
| 141 } | |
| 142 | |
| 143 // When modelview and projection matrices are identity (default) the world is | |
| 144 // contained in the square around origin with unit size 2. Drawing to these | |
| 145 // coordinates is equivalent to drawing to the entire screen. The texture is | |
| 146 // stretched over that square using texture coordinates (u, v) that range | |
| 147 // from (0, 0) to (1, 1) inclusive. Texture coordinates are flipped vertically | |
| 148 // here because the incoming frame has origin in upper left hand corner but | |
| 149 // OpenGL expects origin in bottom left corner. | |
| 150 const GLfloat gVertices[] = { | |
| 151 // X, Y, U, V. | |
| 152 -1, -1, 0, 1, // Bottom left. | |
| 153 1, -1, 1, 1, // Bottom right. | |
| 154 1, 1, 1, 0, // Top right. | |
| 155 -1, 1, 0, 0, // Top left. | |
| 156 }; | |
| 157 | |
| 158 // |kNumTextures| must not exceed 8, which is the limit in OpenGLES2. Two sets | |
| 159 // of 3 textures are used here, one for each of the Y, U and V planes. Having | |
| 160 // two sets alleviates CPU blockage in the event that the GPU is asked to render | |
| 161 // to a texture that is already in use. | |
| 162 static const GLsizei kNumTextureSets = 2; | |
| 163 static const GLsizei kNumTextures = 3 * kNumTextureSets; | |
| 164 | |
| 165 @implementation RTCOpenGLVideoRenderer { | |
| 166 #if TARGET_OS_IPHONE | |
| 167 EAGLContext* _context; | |
| 168 #else | |
| 169 NSOpenGLContext* _context; | |
| 170 #endif | |
| 171 BOOL _isInitialized; | |
| 172 NSUInteger _currentTextureSet; | |
| 173 // Handles for OpenGL constructs. | |
| 174 GLuint _textures[kNumTextures]; | |
| 175 GLuint _program; | |
| 176 #if !TARGET_OS_IPHONE | |
| 177 GLuint _vertexArray; | |
| 178 #endif | |
| 179 GLuint _vertexBuffer; | |
| 180 GLint _position; | |
| 181 GLint _texcoord; | |
| 182 GLint _ySampler; | |
| 183 GLint _uSampler; | |
| 184 GLint _vSampler; | |
| 185 // Used to create a non-padded plane for GPU upload when we receive padded | |
| 186 // frames. | |
| 187 std::unique_ptr<uint8_t[]> _planeBuffer; | |
| 188 } | |
| 189 | |
| 190 + (void)initialize { | |
| 191 // Disable dithering for performance. | |
| 192 glDisable(GL_DITHER); | |
| 193 } | |
| 194 | |
| 195 #if TARGET_OS_IPHONE | |
| 196 - (instancetype)initWithContext:(EAGLContext*)context { | |
| 197 #else | |
| 198 - (instancetype)initWithContext:(NSOpenGLContext*)context { | |
| 199 #endif | |
| 200 NSAssert(context != nil, @"context cannot be nil"); | |
| 201 if (self = [super init]) { | |
| 202 _context = context; | |
| 203 } | |
| 204 return self; | |
| 205 } | |
| 206 | |
| 207 - (BOOL)drawFrame:(RTCI420Frame*)frame { | |
| 208 if (!_isInitialized) { | |
| 209 return NO; | |
| 210 } | |
| 211 if (_lastDrawnFrame == frame) { | |
| 212 return NO; | |
| 213 } | |
| 214 [self ensureGLContext]; | |
| 215 glClear(GL_COLOR_BUFFER_BIT); | |
| 216 if (frame) { | |
| 217 if (![self updateTextureSizesForFrame:frame] || | |
| 218 ![self updateTextureDataForFrame:frame]) { | |
| 219 return NO; | |
| 220 } | |
| 221 #if !TARGET_OS_IPHONE | |
| 222 glBindVertexArray(_vertexArray); | |
| 223 #endif | |
| 224 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); | |
| 225 glDrawArrays(GL_TRIANGLE_FAN, 0, 4); | |
| 226 } | |
| 227 #if !TARGET_OS_IPHONE | |
| 228 [_context flushBuffer]; | |
| 229 #endif | |
| 230 _lastDrawnFrame = frame; | |
| 231 return YES; | |
| 232 } | |
| 233 | |
| 234 - (void)setupGL { | |
| 235 if (_isInitialized) { | |
| 236 return; | |
| 237 } | |
| 238 [self ensureGLContext]; | |
| 239 if (![self setupProgram]) { | |
| 240 return; | |
| 241 } | |
| 242 if (![self setupTextures]) { | |
| 243 return; | |
| 244 } | |
| 245 if (![self setupVertices]) { | |
| 246 return; | |
| 247 } | |
| 248 glUseProgram(_program); | |
| 249 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); | |
| 250 _isInitialized = YES; | |
| 251 } | |
| 252 | |
| 253 - (void)teardownGL { | |
| 254 if (!_isInitialized) { | |
| 255 return; | |
| 256 } | |
| 257 [self ensureGLContext]; | |
| 258 glDeleteProgram(_program); | |
| 259 _program = 0; | |
| 260 glDeleteTextures(kNumTextures, _textures); | |
| 261 glDeleteBuffers(1, &_vertexBuffer); | |
| 262 _vertexBuffer = 0; | |
| 263 #if !TARGET_OS_IPHONE | |
| 264 glDeleteVertexArrays(1, &_vertexArray); | |
| 265 #endif | |
| 266 _isInitialized = NO; | |
| 267 } | |
| 268 | |
| 269 #pragma mark - Private | |
| 270 | |
| 271 - (void)ensureGLContext { | |
| 272 NSAssert(_context, @"context shouldn't be nil"); | |
| 273 #if TARGET_OS_IPHONE | |
| 274 if ([EAGLContext currentContext] != _context) { | |
| 275 [EAGLContext setCurrentContext:_context]; | |
| 276 } | |
| 277 #else | |
| 278 if ([NSOpenGLContext currentContext] != _context) { | |
| 279 [_context makeCurrentContext]; | |
| 280 } | |
| 281 #endif | |
| 282 } | |
| 283 | |
| 284 - (BOOL)setupProgram { | |
| 285 NSAssert(!_program, @"program already set up"); | |
| 286 GLuint vertexShader = CreateShader(GL_VERTEX_SHADER, kVertexShaderSource); | |
| 287 NSAssert(vertexShader, @"failed to create vertex shader"); | |
| 288 GLuint fragmentShader = | |
| 289 CreateShader(GL_FRAGMENT_SHADER, kFragmentShaderSource); | |
| 290 NSAssert(fragmentShader, @"failed to create fragment shader"); | |
| 291 _program = CreateProgram(vertexShader, fragmentShader); | |
| 292 // Shaders are created only to generate program. | |
| 293 if (vertexShader) { | |
| 294 glDeleteShader(vertexShader); | |
| 295 } | |
| 296 if (fragmentShader) { | |
| 297 glDeleteShader(fragmentShader); | |
| 298 } | |
| 299 if (!_program) { | |
| 300 return NO; | |
| 301 } | |
| 302 _position = glGetAttribLocation(_program, "position"); | |
| 303 _texcoord = glGetAttribLocation(_program, "texcoord"); | |
| 304 _ySampler = glGetUniformLocation(_program, "s_textureY"); | |
| 305 _uSampler = glGetUniformLocation(_program, "s_textureU"); | |
| 306 _vSampler = glGetUniformLocation(_program, "s_textureV"); | |
| 307 if (_position < 0 || _texcoord < 0 || _ySampler < 0 || _uSampler < 0 || | |
| 308 _vSampler < 0) { | |
| 309 return NO; | |
| 310 } | |
| 311 return YES; | |
| 312 } | |
| 313 | |
| 314 - (BOOL)setupTextures { | |
| 315 glGenTextures(kNumTextures, _textures); | |
| 316 // Set parameters for each of the textures we created. | |
| 317 for (GLsizei i = 0; i < kNumTextures; i++) { | |
| 318 glActiveTexture(GL_TEXTURE0 + i); | |
| 319 glBindTexture(GL_TEXTURE_2D, _textures[i]); | |
| 320 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); | |
| 321 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); | |
| 322 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); | |
| 323 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); | |
| 324 } | |
| 325 return YES; | |
| 326 } | |
| 327 | |
| 328 - (BOOL)updateTextureSizesForFrame:(RTCI420Frame*)frame { | |
| 329 if (frame.height == _lastDrawnFrame.height && | |
| 330 frame.width == _lastDrawnFrame.width && | |
| 331 frame.chromaWidth == _lastDrawnFrame.chromaWidth && | |
| 332 frame.chromaHeight == _lastDrawnFrame.chromaHeight) { | |
| 333 return YES; | |
| 334 } | |
| 335 GLsizei lumaWidth = frame.width; | |
| 336 GLsizei lumaHeight = frame.height; | |
| 337 GLsizei chromaWidth = frame.chromaWidth; | |
| 338 GLsizei chromaHeight = frame.chromaHeight; | |
| 339 for (GLint i = 0; i < kNumTextureSets; i++) { | |
| 340 glActiveTexture(GL_TEXTURE0 + i * 3); | |
| 341 glTexImage2D(GL_TEXTURE_2D, | |
| 342 0, | |
| 343 RTC_PIXEL_FORMAT, | |
| 344 lumaWidth, | |
| 345 lumaHeight, | |
| 346 0, | |
| 347 RTC_PIXEL_FORMAT, | |
| 348 GL_UNSIGNED_BYTE, | |
| 349 0); | |
| 350 glActiveTexture(GL_TEXTURE0 + i * 3 + 1); | |
| 351 glTexImage2D(GL_TEXTURE_2D, | |
| 352 0, | |
| 353 RTC_PIXEL_FORMAT, | |
| 354 chromaWidth, | |
| 355 chromaHeight, | |
| 356 0, | |
| 357 RTC_PIXEL_FORMAT, | |
| 358 GL_UNSIGNED_BYTE, | |
| 359 0); | |
| 360 glActiveTexture(GL_TEXTURE0 + i * 3 + 2); | |
| 361 glTexImage2D(GL_TEXTURE_2D, | |
| 362 0, | |
| 363 RTC_PIXEL_FORMAT, | |
| 364 chromaWidth, | |
| 365 chromaHeight, | |
| 366 0, | |
| 367 RTC_PIXEL_FORMAT, | |
| 368 GL_UNSIGNED_BYTE, | |
| 369 0); | |
| 370 } | |
| 371 if (frame.yPitch != frame.width || frame.uPitch != frame.chromaWidth || | |
| 372 frame.vPitch != frame.chromaWidth) { | |
| 373 _planeBuffer.reset(new uint8_t[frame.width * frame.height]); | |
| 374 } else { | |
| 375 _planeBuffer.reset(); | |
| 376 } | |
| 377 return YES; | |
| 378 } | |
| 379 | |
| 380 - (void)uploadPlane:(const uint8_t*)plane | |
| 381 sampler:(GLint)sampler | |
| 382 offset:(NSUInteger)offset | |
| 383 width:(NSUInteger)width | |
| 384 height:(NSUInteger)height | |
| 385 stride:(NSInteger)stride { | |
| 386 glActiveTexture(GL_TEXTURE0 + offset); | |
| 387 // When setting texture sampler uniforms, the texture index is used not | |
| 388 // the texture handle. | |
| 389 glUniform1i(sampler, offset); | |
| 390 #if TARGET_OS_IPHONE | |
| 391 BOOL hasUnpackRowLength = _context.API == kEAGLRenderingAPIOpenGLES3; | |
| 392 #else | |
| 393 BOOL hasUnpackRowLength = YES; | |
| 394 #endif | |
| 395 const uint8_t* uploadPlane = plane; | |
| 396 if (stride != width) { | |
| 397 if (hasUnpackRowLength) { | |
| 398 // GLES3 allows us to specify stride. | |
| 399 glPixelStorei(GL_UNPACK_ROW_LENGTH, stride); | |
| 400 glTexImage2D(GL_TEXTURE_2D, | |
| 401 0, | |
| 402 RTC_PIXEL_FORMAT, | |
| 403 width, | |
| 404 height, | |
| 405 0, | |
| 406 RTC_PIXEL_FORMAT, | |
| 407 GL_UNSIGNED_BYTE, | |
| 408 uploadPlane); | |
| 409 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); | |
| 410 return; | |
| 411 } else { | |
| 412 // Make an unpadded copy and upload that instead. Quick profiling showed | |
| 413 // that this is faster than uploading row by row using glTexSubImage2D. | |
| 414 uint8_t* unpaddedPlane = _planeBuffer.get(); | |
| 415 for (NSUInteger y = 0; y < height; ++y) { | |
| 416 memcpy(unpaddedPlane + y * width, plane + y * stride, width); | |
| 417 } | |
| 418 uploadPlane = unpaddedPlane; | |
| 419 } | |
| 420 } | |
| 421 glTexImage2D(GL_TEXTURE_2D, | |
| 422 0, | |
| 423 RTC_PIXEL_FORMAT, | |
| 424 width, | |
| 425 height, | |
| 426 0, | |
| 427 RTC_PIXEL_FORMAT, | |
| 428 GL_UNSIGNED_BYTE, | |
| 429 uploadPlane); | |
| 430 } | |
| 431 | |
| 432 - (BOOL)updateTextureDataForFrame:(RTCI420Frame*)frame { | |
| 433 NSUInteger textureOffset = _currentTextureSet * 3; | |
| 434 NSAssert(textureOffset + 3 <= kNumTextures, @"invalid offset"); | |
| 435 | |
| 436 [self uploadPlane:frame.yPlane | |
| 437 sampler:_ySampler | |
| 438 offset:textureOffset | |
| 439 width:frame.width | |
| 440 height:frame.height | |
| 441 stride:frame.yPitch]; | |
| 442 | |
| 443 [self uploadPlane:frame.uPlane | |
| 444 sampler:_uSampler | |
| 445 offset:textureOffset + 1 | |
| 446 width:frame.chromaWidth | |
| 447 height:frame.chromaHeight | |
| 448 stride:frame.uPitch]; | |
| 449 | |
| 450 [self uploadPlane:frame.vPlane | |
| 451 sampler:_vSampler | |
| 452 offset:textureOffset + 2 | |
| 453 width:frame.chromaWidth | |
| 454 height:frame.chromaHeight | |
| 455 stride:frame.vPitch]; | |
| 456 | |
| 457 _currentTextureSet = (_currentTextureSet + 1) % kNumTextureSets; | |
| 458 return YES; | |
| 459 } | |
| 460 | |
| 461 - (BOOL)setupVertices { | |
| 462 #if !TARGET_OS_IPHONE | |
| 463 NSAssert(!_vertexArray, @"vertex array already set up"); | |
| 464 glGenVertexArrays(1, &_vertexArray); | |
| 465 if (!_vertexArray) { | |
| 466 return NO; | |
| 467 } | |
| 468 glBindVertexArray(_vertexArray); | |
| 469 #endif | |
| 470 NSAssert(!_vertexBuffer, @"vertex buffer already set up"); | |
| 471 glGenBuffers(1, &_vertexBuffer); | |
| 472 if (!_vertexBuffer) { | |
| 473 #if !TARGET_OS_IPHONE | |
| 474 glDeleteVertexArrays(1, &_vertexArray); | |
| 475 _vertexArray = 0; | |
| 476 #endif | |
| 477 return NO; | |
| 478 } | |
| 479 glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); | |
| 480 glBufferData(GL_ARRAY_BUFFER, sizeof(gVertices), gVertices, GL_DYNAMIC_DRAW); | |
| 481 | |
| 482 // Read position attribute from |gVertices| with size of 2 and stride of 4 | |
| 483 // beginning at the start of the array. The last argument indicates offset | |
| 484 // of data within |gVertices| as supplied to the vertex buffer. | |
| 485 glVertexAttribPointer( | |
| 486 _position, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (void*)0); | |
| 487 glEnableVertexAttribArray(_position); | |
| 488 | |
| 489 // Read texcoord attribute from |gVertices| with size of 2 and stride of 4 | |
| 490 // beginning at the first texcoord in the array. The last argument indicates | |
| 491 // offset of data within |gVertices| as supplied to the vertex buffer. | |
| 492 glVertexAttribPointer(_texcoord, | |
| 493 2, | |
| 494 GL_FLOAT, | |
| 495 GL_FALSE, | |
| 496 4 * sizeof(GLfloat), | |
| 497 (void*)(2 * sizeof(GLfloat))); | |
| 498 glEnableVertexAttribArray(_texcoord); | |
| 499 | |
| 500 return YES; | |
| 501 } | |
| 502 | |
| 503 @end | |
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Chromium Code Reviews
Issue 2296613002:
Delete talk directory, and references from build_ios_libs.sh. (Closed)
