/*
 * Copyright (C) 2015 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

typedef unsigned long      GLenum;
typedef boolean            GLboolean;
typedef unsigned long      GLbitfield;
typedef byte               GLbyte;
typedef short              GLshort;
typedef long               GLint;
typedef long               GLsizei;
typedef long long          GLintptr;
typedef long long          GLsizeiptr;
typedef long long          GLint64;
typedef octet              GLubyte;
typedef unsigned short     GLushort;
typedef unsigned long      GLuint;
typedef unsigned long long GLuint64;
typedef unrestricted float GLfloat;
typedef unrestricted float GLclampf;
typedef (ArrayBuffer or ArrayBufferView) BufferDataSource;
typedef (Float32Array or sequence<GLfloat>) Float32List;
typedef (Int32Array or sequence<GLint>) Int32List;
typedef (Uint32Array or sequence<GLuint>) Uint32List;

#ifdef ENABLE_VIDEO
typedef (ImageBitmap or ImageData or HTMLImageElement or HTMLCanvasElement or HTMLVideoElement) TexImageSource;
#else
typedef (ImageBitmap or ImageData or HTMLImageElement or HTMLCanvasElement) TexImageSource;
#endif

[
    ActiveDOMObject,
    Conditional=WEBGL2,
    EnabledAtRuntime=WebGL2,
    JSCustomMarkFunction,
    JSGenerateToJSObject,
    DoNotCheckConstants,
    CallTracingCallback=recordCanvasAction,
] interface WebGL2RenderingContext {
    const GLenum READ_BUFFER                                   = 0x0C02;
    const GLenum UNPACK_ROW_LENGTH                             = 0x0CF2;
    const GLenum UNPACK_SKIP_ROWS                              = 0x0CF3;
    const GLenum UNPACK_SKIP_PIXELS                            = 0x0CF4;
    const GLenum PACK_ROW_LENGTH                               = 0x0D02;
    const GLenum PACK_SKIP_ROWS                                = 0x0D03;
    const GLenum PACK_SKIP_PIXELS                              = 0x0D04;
    const GLenum COLOR                                         = 0x1800;
    const GLenum DEPTH                                         = 0x1801;
    const GLenum STENCIL                                       = 0x1802;
    const GLenum RED                                           = 0x1903;
    const GLenum RGB8                                          = 0x8051;
    const GLenum RGBA8                                         = 0x8058;
    const GLenum RGB10_A2                                      = 0x8059;
    const GLenum TEXTURE_BINDING_3D                            = 0x806A;
    const GLenum UNPACK_SKIP_IMAGES                            = 0x806D;
    const GLenum UNPACK_IMAGE_HEIGHT                           = 0x806E;
    const GLenum TEXTURE_3D                                    = 0x806F;
    const GLenum TEXTURE_WRAP_R                                = 0x8072;
    const GLenum MAX_3D_TEXTURE_SIZE                           = 0x8073;
    const GLenum UNSIGNED_INT_2_10_10_10_REV                   = 0x8368;
    const GLenum MAX_ELEMENTS_VERTICES                         = 0x80E8;
    const GLenum MAX_ELEMENTS_INDICES                          = 0x80E9;
    const GLenum TEXTURE_MIN_LOD                               = 0x813A;
    const GLenum TEXTURE_MAX_LOD                               = 0x813B;
    const GLenum TEXTURE_BASE_LEVEL                            = 0x813C;
    const GLenum TEXTURE_MAX_LEVEL                             = 0x813D;
    const GLenum MIN                                           = 0x8007;
    const GLenum MAX                                           = 0x8008;
    const GLenum DEPTH_COMPONENT24                             = 0x81A6;
    const GLenum MAX_TEXTURE_LOD_BIAS                          = 0x84FD;
    const GLenum TEXTURE_COMPARE_MODE                          = 0x884C;
    const GLenum TEXTURE_COMPARE_FUNC                          = 0x884D;
    const GLenum CURRENT_QUERY                                 = 0x8865;
    const GLenum QUERY_RESULT                                  = 0x8866;
    const GLenum QUERY_RESULT_AVAILABLE                        = 0x8867;
    const GLenum STREAM_READ                                   = 0x88E1;
    const GLenum STREAM_COPY                                   = 0x88E2;
    const GLenum STATIC_READ                                   = 0x88E5;
    const GLenum STATIC_COPY                                   = 0x88E6;
    const GLenum DYNAMIC_READ                                  = 0x88E9;
    const GLenum DYNAMIC_COPY                                  = 0x88EA;
    const GLenum MAX_DRAW_BUFFERS                              = 0x8824;
    const GLenum DRAW_BUFFER0                                  = 0x8825;
    const GLenum DRAW_BUFFER1                                  = 0x8826;
    const GLenum DRAW_BUFFER2                                  = 0x8827;
    const GLenum DRAW_BUFFER3                                  = 0x8828;
    const GLenum DRAW_BUFFER4                                  = 0x8829;
    const GLenum DRAW_BUFFER5                                  = 0x882A;
    const GLenum DRAW_BUFFER6                                  = 0x882B;
    const GLenum DRAW_BUFFER7                                  = 0x882C;
    const GLenum DRAW_BUFFER8                                  = 0x882D;
    const GLenum DRAW_BUFFER9                                  = 0x882E;
    const GLenum DRAW_BUFFER10                                 = 0x882F;
    const GLenum DRAW_BUFFER11                                 = 0x8830;
    const GLenum DRAW_BUFFER12                                 = 0x8831;
    const GLenum DRAW_BUFFER13                                 = 0x8832;
    const GLenum DRAW_BUFFER14                                 = 0x8833;
    const GLenum DRAW_BUFFER15                                 = 0x8834;
    const GLenum MAX_FRAGMENT_UNIFORM_COMPONENTS               = 0x8B49;
    const GLenum MAX_VERTEX_UNIFORM_COMPONENTS                 = 0x8B4A;
    const GLenum SAMPLER_3D                                    = 0x8B5F;
    const GLenum SAMPLER_2D_SHADOW                             = 0x8B62;
    const GLenum FRAGMENT_SHADER_DERIVATIVE_HINT               = 0x8B8B;
    const GLenum PIXEL_PACK_BUFFER                             = 0x88EB;
    const GLenum PIXEL_UNPACK_BUFFER                           = 0x88EC;
    const GLenum PIXEL_PACK_BUFFER_BINDING                     = 0x88ED;
    const GLenum PIXEL_UNPACK_BUFFER_BINDING                   = 0x88EF;
    const GLenum FLOAT_MAT2x3                                  = 0x8B65;
    const GLenum FLOAT_MAT2x4                                  = 0x8B66;
    const GLenum FLOAT_MAT3x2                                  = 0x8B67;
    const GLenum FLOAT_MAT3x4                                  = 0x8B68;
    const GLenum FLOAT_MAT4x2                                  = 0x8B69;
    const GLenum FLOAT_MAT4x3                                  = 0x8B6A;
    const GLenum SRGB                                          = 0x8C40;
    const GLenum SRGB8                                         = 0x8C41;
    const GLenum SRGB8_ALPHA8                                  = 0x8C43;
    const GLenum COMPARE_REF_TO_TEXTURE                        = 0x884E;
    const GLenum RGBA32F                                       = 0x8814;
    const GLenum RGB32F                                        = 0x8815;
    const GLenum RGBA16F                                       = 0x881A;
    const GLenum RGB16F                                        = 0x881B;
    const GLenum VERTEX_ATTRIB_ARRAY_INTEGER                   = 0x88FD;
    const GLenum MAX_ARRAY_TEXTURE_LAYERS                      = 0x88FF;
    const GLenum MIN_PROGRAM_TEXEL_OFFSET                      = 0x8904;
    const GLenum MAX_PROGRAM_TEXEL_OFFSET                      = 0x8905;
    const GLenum MAX_VARYING_COMPONENTS                        = 0x8B4B;
    const GLenum TEXTURE_2D_ARRAY                              = 0x8C1A;
    const GLenum TEXTURE_BINDING_2D_ARRAY                      = 0x8C1D;
    const GLenum R11F_G11F_B10F                                = 0x8C3A;
    const GLenum UNSIGNED_INT_10F_11F_11F_REV                  = 0x8C3B;
    const GLenum RGB9_E5                                       = 0x8C3D;
    const GLenum UNSIGNED_INT_5_9_9_9_REV                      = 0x8C3E;
    const GLenum TRANSFORM_FEEDBACK_BUFFER_MODE                = 0x8C7F;
    const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    = 0x8C80;
    const GLenum TRANSFORM_FEEDBACK_VARYINGS                   = 0x8C83;
    const GLenum TRANSFORM_FEEDBACK_BUFFER_START               = 0x8C84;
    const GLenum TRANSFORM_FEEDBACK_BUFFER_SIZE                = 0x8C85;
    const GLenum TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN         = 0x8C88;
    const GLenum RASTERIZER_DISCARD                            = 0x8C89;
    const GLenum MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 0x8C8A;
    const GLenum MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       = 0x8C8B;
    const GLenum INTERLEAVED_ATTRIBS                           = 0x8C8C;
    const GLenum SEPARATE_ATTRIBS                              = 0x8C8D;
    const GLenum TRANSFORM_FEEDBACK_BUFFER                     = 0x8C8E;
    const GLenum TRANSFORM_FEEDBACK_BUFFER_BINDING             = 0x8C8F;
    const GLenum RGBA32UI                                      = 0x8D70;
    const GLenum RGB32UI                                       = 0x8D71;
    const GLenum RGBA16UI                                      = 0x8D76;
    const GLenum RGB16UI                                       = 0x8D77;
    const GLenum RGBA8UI                                       = 0x8D7C;
    const GLenum RGB8UI                                        = 0x8D7D;
    const GLenum RGBA32I                                       = 0x8D82;
    const GLenum RGB32I                                        = 0x8D83;
    const GLenum RGBA16I                                       = 0x8D88;
    const GLenum RGB16I                                        = 0x8D89;
    const GLenum RGBA8I                                        = 0x8D8E;
    const GLenum RGB8I                                         = 0x8D8F;
    const GLenum RED_INTEGER                                   = 0x8D94;
    const GLenum RGB_INTEGER                                   = 0x8D98;
    const GLenum RGBA_INTEGER                                  = 0x8D99;
    const GLenum SAMPLER_2D_ARRAY                              = 0x8DC1;
    const GLenum SAMPLER_2D_ARRAY_SHADOW                       = 0x8DC4;
    const GLenum SAMPLER_CUBE_SHADOW                           = 0x8DC5;
    const GLenum UNSIGNED_INT_VEC2                             = 0x8DC6;
    const GLenum UNSIGNED_INT_VEC3                             = 0x8DC7;
    const GLenum UNSIGNED_INT_VEC4                             = 0x8DC8;
    const GLenum INT_SAMPLER_2D                                = 0x8DCA;
    const GLenum INT_SAMPLER_3D                                = 0x8DCB;
    const GLenum INT_SAMPLER_CUBE                              = 0x8DCC;
    const GLenum INT_SAMPLER_2D_ARRAY                          = 0x8DCF;
    const GLenum UNSIGNED_INT_SAMPLER_2D                       = 0x8DD2;
    const GLenum UNSIGNED_INT_SAMPLER_3D                       = 0x8DD3;
    const GLenum UNSIGNED_INT_SAMPLER_CUBE                     = 0x8DD4;
    const GLenum UNSIGNED_INT_SAMPLER_2D_ARRAY                 = 0x8DD7;
    const GLenum DEPTH_COMPONENT32F                            = 0x8CAC;
    const GLenum DEPTH32F_STENCIL8                             = 0x8CAD;
    const GLenum FLOAT_32_UNSIGNED_INT_24_8_REV                = 0x8DAD;
    const GLenum FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING         = 0x8210;
    const GLenum FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE         = 0x8211;
    const GLenum FRAMEBUFFER_ATTACHMENT_RED_SIZE               = 0x8212;
    const GLenum FRAMEBUFFER_ATTACHMENT_GREEN_SIZE             = 0x8213;
    const GLenum FRAMEBUFFER_ATTACHMENT_BLUE_SIZE              = 0x8214;
    const GLenum FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE             = 0x8215;
    const GLenum FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE             = 0x8216;
    const GLenum FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE           = 0x8217;
    const GLenum FRAMEBUFFER_DEFAULT                           = 0x8218;
    const GLenum DEPTH_STENCIL_ATTACHMENT                      = 0x821A;
    const GLenum DEPTH_STENCIL                                 = 0x84F9;
    const GLenum UNSIGNED_INT_24_8                             = 0x84FA;
    const GLenum DEPTH24_STENCIL8                              = 0x88F0;
    const GLenum UNSIGNED_NORMALIZED                           = 0x8C17;
    const GLenum DRAW_FRAMEBUFFER_BINDING                      = 0x8CA6; /* Same as FRAMEBUFFER_BINDING */
    const GLenum READ_FRAMEBUFFER                              = 0x8CA8;
    const GLenum DRAW_FRAMEBUFFER                              = 0x8CA9;
    const GLenum READ_FRAMEBUFFER_BINDING                      = 0x8CAA;
    const GLenum RENDERBUFFER_SAMPLES                          = 0x8CAB;
    const GLenum FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER          = 0x8CD4;
    const GLenum MAX_COLOR_ATTACHMENTS                         = 0x8CDF;
    const GLenum COLOR_ATTACHMENT1                             = 0x8CE1;
    const GLenum COLOR_ATTACHMENT2                             = 0x8CE2;
    const GLenum COLOR_ATTACHMENT3                             = 0x8CE3;
    const GLenum COLOR_ATTACHMENT4                             = 0x8CE4;
    const GLenum COLOR_ATTACHMENT5                             = 0x8CE5;
    const GLenum COLOR_ATTACHMENT6                             = 0x8CE6;
    const GLenum COLOR_ATTACHMENT7                             = 0x8CE7;
    const GLenum COLOR_ATTACHMENT8                             = 0x8CE8;
    const GLenum COLOR_ATTACHMENT9                             = 0x8CE9;
    const GLenum COLOR_ATTACHMENT10                            = 0x8CEA;
    const GLenum COLOR_ATTACHMENT11                            = 0x8CEB;
    const GLenum COLOR_ATTACHMENT12                            = 0x8CEC;
    const GLenum COLOR_ATTACHMENT13                            = 0x8CED;
    const GLenum COLOR_ATTACHMENT14                            = 0x8CEE;
    const GLenum COLOR_ATTACHMENT15                            = 0x8CEF;
    const GLenum FRAMEBUFFER_INCOMPLETE_MULTISAMPLE            = 0x8D56;
    const GLenum MAX_SAMPLES                                   = 0x8D57;
    const GLenum HALF_FLOAT                                    = 0x140B;
    const GLenum RG                                            = 0x8227;
    const GLenum RG_INTEGER                                    = 0x8228;
    const GLenum R8                                            = 0x8229;
    const GLenum RG8                                           = 0x822B;
    const GLenum R16F                                          = 0x822D;
    const GLenum R32F                                          = 0x822E;
    const GLenum RG16F                                         = 0x822F;
    const GLenum RG32F                                         = 0x8230;
    const GLenum R8I                                           = 0x8231;
    const GLenum R8UI                                          = 0x8232;
    const GLenum R16I                                          = 0x8233;
    const GLenum R16UI                                         = 0x8234;
    const GLenum R32I                                          = 0x8235;
    const GLenum R32UI                                         = 0x8236;
    const GLenum RG8I                                          = 0x8237;
    const GLenum RG8UI                                         = 0x8238;
    const GLenum RG16I                                         = 0x8239;
    const GLenum RG16UI                                        = 0x823A;
    const GLenum RG32I                                         = 0x823B;
    const GLenum RG32UI                                        = 0x823C;
    const GLenum VERTEX_ARRAY_BINDING                          = 0x85B5;
    const GLenum R8_SNORM                                      = 0x8F94;
    const GLenum RG8_SNORM                                     = 0x8F95;
    const GLenum RGB8_SNORM                                    = 0x8F96;
    const GLenum RGBA8_SNORM                                   = 0x8F97;
    const GLenum SIGNED_NORMALIZED                             = 0x8F9C;
    const GLenum COPY_READ_BUFFER                              = 0x8F36;
    const GLenum COPY_WRITE_BUFFER                             = 0x8F37;
    const GLenum COPY_READ_BUFFER_BINDING                      = 0x8F36; /* Same as COPY_READ_BUFFER */
    const GLenum COPY_WRITE_BUFFER_BINDING                     = 0x8F37; /* Same as COPY_WRITE_BUFFER */
    const GLenum UNIFORM_BUFFER                                = 0x8A11;
    const GLenum UNIFORM_BUFFER_BINDING                        = 0x8A28;
    const GLenum UNIFORM_BUFFER_START                          = 0x8A29;
    const GLenum UNIFORM_BUFFER_SIZE                           = 0x8A2A;
    const GLenum MAX_VERTEX_UNIFORM_BLOCKS                     = 0x8A2B;
    const GLenum MAX_FRAGMENT_UNIFORM_BLOCKS                   = 0x8A2D;
    const GLenum MAX_COMBINED_UNIFORM_BLOCKS                   = 0x8A2E;
    const GLenum MAX_UNIFORM_BUFFER_BINDINGS                   = 0x8A2F;
    const GLenum MAX_UNIFORM_BLOCK_SIZE                        = 0x8A30;
    const GLenum MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS        = 0x8A31;
    const GLenum MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS      = 0x8A33;
    const GLenum UNIFORM_BUFFER_OFFSET_ALIGNMENT               = 0x8A34;
    const GLenum ACTIVE_UNIFORM_BLOCKS                         = 0x8A36;
    const GLenum UNIFORM_TYPE                                  = 0x8A37;
    const GLenum UNIFORM_SIZE                                  = 0x8A38;
    const GLenum UNIFORM_BLOCK_INDEX                           = 0x8A3A;
    const GLenum UNIFORM_OFFSET                                = 0x8A3B;
    const GLenum UNIFORM_ARRAY_STRIDE                          = 0x8A3C;
    const GLenum UNIFORM_MATRIX_STRIDE                         = 0x8A3D;
    const GLenum UNIFORM_IS_ROW_MAJOR                          = 0x8A3E;
    const GLenum UNIFORM_BLOCK_BINDING                         = 0x8A3F;
    const GLenum UNIFORM_BLOCK_DATA_SIZE                       = 0x8A40;
    const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORMS                 = 0x8A42;
    const GLenum UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES          = 0x8A43;
    const GLenum UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER     = 0x8A44;
    const GLenum UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER   = 0x8A46;
    const GLenum INVALID_INDEX                                 = 0xFFFFFFFF;
    const GLenum MAX_VERTEX_OUTPUT_COMPONENTS                  = 0x9122;
    const GLenum MAX_FRAGMENT_INPUT_COMPONENTS                 = 0x9125;
    const GLenum MAX_SERVER_WAIT_TIMEOUT                       = 0x9111;
    const GLenum OBJECT_TYPE                                   = 0x9112;
    const GLenum SYNC_CONDITION                                = 0x9113;
    const GLenum SYNC_STATUS                                   = 0x9114;
    const GLenum SYNC_FLAGS                                    = 0x9115;
    const GLenum SYNC_FENCE                                    = 0x9116;
    const GLenum SYNC_GPU_COMMANDS_COMPLETE                    = 0x9117;
    const GLenum UNSIGNALED                                    = 0x9118;
    const GLenum SIGNALED                                      = 0x9119;
    const GLenum ALREADY_SIGNALED                              = 0x911A;
    const GLenum TIMEOUT_EXPIRED                               = 0x911B;
    const GLenum CONDITION_SATISFIED                           = 0x911C;
    const GLenum WAIT_FAILED                                   = 0x911D;
    const GLenum SYNC_FLUSH_COMMANDS_BIT                       = 0x00000001;
    const GLenum VERTEX_ATTRIB_ARRAY_DIVISOR                   = 0x88FE;
    const GLenum ANY_SAMPLES_PASSED                            = 0x8C2F;
    const GLenum ANY_SAMPLES_PASSED_CONSERVATIVE               = 0x8D6A;
    const GLenum SAMPLER_BINDING                               = 0x8919;
    const GLenum RGB10_A2UI                                    = 0x906F;
    const GLenum INT_2_10_10_10_REV                            = 0x8D9F;
    const GLenum TRANSFORM_FEEDBACK                            = 0x8E22;
    const GLenum TRANSFORM_FEEDBACK_PAUSED                     = 0x8E23;
    const GLenum TRANSFORM_FEEDBACK_ACTIVE                     = 0x8E24;
    const GLenum TRANSFORM_FEEDBACK_BINDING                    = 0x8E25;
    const GLenum TEXTURE_IMMUTABLE_FORMAT                      = 0x912F;
    const GLenum MAX_ELEMENT_INDEX                             = 0x8D6B;
    const GLenum TEXTURE_IMMUTABLE_LEVELS                      = 0x82DF;

    const GLint64 TIMEOUT_IGNORED                              = -1;

    /* WebGL-specific enums */
    const GLenum MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 = 0x9247;

    /* Buffer objects */
    void bufferData(GLenum target, ArrayBufferView data, GLenum usage, GLuint srcOffset, optional GLuint length = 0);
    void bufferSubData(GLenum target, GLintptr dstByteOffset, ArrayBufferView srcData, GLuint srcOffset, optional GLuint length = 0);

    void copyBufferSubData(GLenum readTarget, GLenum writeTarget, GLintptr readOffset, GLintptr writeOffset, GLsizeiptr size);
    // MapBufferRange, in particular its read-only and write-only modes,
    // can not be exposed safely to JavaScript. GetBufferSubData
    // replaces it for the purpose of fetching data back from the GPU.
    void getBufferSubData(GLenum target, GLintptr srcByteOffset, ArrayBufferView dstData, optional GLuint dstOffset = 0, optional GLuint length = 0);

    /* Framebuffer objects */
    void blitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
    void framebufferTextureLayer(GLenum target, GLenum attachment, WebGLTexture? texture, GLint level, GLint layer);
    void invalidateFramebuffer(GLenum target, sequence<GLenum> attachments);
    void invalidateSubFramebuffer(GLenum target, sequence<GLenum> attachments, GLint x, GLint y, GLsizei width, GLsizei height);
    void readBuffer(GLenum src);

    /* Renderbuffer objects */
    [OverrideIDLType=IDLWebGLAny] any getInternalformatParameter(GLenum target, GLenum internalformat, GLenum pname);
    void renderbufferStorageMultisample(GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height);

    /* Texture objects */
    void texStorage2D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height);
    void texStorage3D(GLenum target, GLsizei levels, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth);

    // WebGL1 legacy entrypoints:
    void texImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, ArrayBufferView? pixels);
    [MayThrowException] void texImage2D(GLenum target, GLint level, GLenum internalformat, GLenum format, GLenum type, TexImageSource? source);

    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView? pixels);
    [MayThrowException] void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLenum format, GLenum type, TexImageSource? source);

    // WebGL2 entrypoints:
    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, GLintptr pboOffset);
    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, TexImageSource source);
    void texImage2D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, ArrayBufferView srcData, GLuint srcOffset);

    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, GLintptr pboOffset);
    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, TexImageSource source);
    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, ArrayBufferView? pixels);
    void texImage3D(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, ArrayBufferView srcData, GLuint srcOffset);

    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, GLintptr pboOffset);
    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, TexImageSource source);
    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView srcData, GLuint srcOffset);

    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, GLintptr pboOffset);
    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, TexImageSource source);
    void texSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, ArrayBufferView? srcData, optional GLuint srcOffset = 0);

    void copyTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height);

    void compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, GLintptr offset);
    void compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, ArrayBufferView srcData, optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);

    void compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, GLintptr offset);
    void compressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, ArrayBufferView srcData, optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);
    void compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLsizei imageSize, GLintptr offset);
    void compressedTexSubImage3D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, ArrayBufferView srcData, optional GLuint srcOffset = 0, optional GLuint srcLengthOverride = 0);

    /* Programs and shaders */
    GLint getFragDataLocation(WebGLProgram program, DOMString name);

    /* Uniforms and attributes */
    void uniform1ui(WebGLUniformLocation? location, GLuint v0);
    void uniform2ui(WebGLUniformLocation? location, GLuint v0, GLuint v1);
    void uniform3ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2);
    void uniform4ui(WebGLUniformLocation? location, GLuint v0, GLuint v1, GLuint v2, GLuint v3);
    void uniform1uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniform2uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniform3uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniform4uiv(WebGLUniformLocation? location, Uint32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniformMatrix2x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniformMatrix3x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniformMatrix2x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniformMatrix4x2fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniformMatrix3x4fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void uniformMatrix4x3fv(WebGLUniformLocation? location, GLboolean transpose, Float32List data, optional GLuint srcOffset = 0, optional GLuint srcLength = 0);
    void vertexAttribI4i(GLuint index, GLint x, GLint y, GLint z, GLint w);
    void vertexAttribI4iv(GLuint index, Int32List values);
    void vertexAttribI4ui(GLuint index, GLuint x, GLuint y, GLuint z, GLuint w);
    void vertexAttribI4uiv(GLuint index, Uint32List values);
    void vertexAttribIPointer(GLuint index, GLint size, GLenum type, GLsizei stride, GLintptr offset);

    /* Writing to the drawing buffer */
    void vertexAttribDivisor(GLuint index, GLuint divisor);
    void drawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instanceCount);
    void drawElementsInstanced(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei instanceCount);
    void drawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, GLintptr offset);

    /* Multiple Render Targets */
    void drawBuffers(sequence<GLenum> buffers);
    void clearBufferiv(GLenum buffer, GLint drawbuffer, Int32List values, optional GLuint srcOffset = 0);
    void clearBufferuiv(GLenum buffer, GLint drawbuffer, Uint32List values, optional GLuint srcOffset = 0);
    void clearBufferfv(GLenum buffer, GLint drawbuffer, Float32List values, optional GLuint srcOffset = 0);
    void clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);

    /* Query Objects */
    WebGLQuery? createQuery();
    void deleteQuery(WebGLQuery? query);
    GLboolean isQuery(WebGLQuery? query);
    void beginQuery(GLenum target, WebGLQuery query);
    void endQuery(GLenum target);
    WebGLQuery? getQuery(GLenum target, GLenum pname);
    [OverrideIDLType=IDLWebGLAny] any getQueryParameter(WebGLQuery query, GLenum pname);

    /* Sampler Objects */
    WebGLSampler? createSampler();
    void deleteSampler(WebGLSampler? sampler);
    GLboolean isSampler(WebGLSampler? sampler);
    void bindSampler(GLuint unit, WebGLSampler? sampler);
    void samplerParameteri(WebGLSampler sampler, GLenum pname, GLint param);
    void samplerParameterf(WebGLSampler sampler, GLenum pname, GLfloat param);
    [OverrideIDLType=IDLWebGLAny] any getSamplerParameter(WebGLSampler sampler, GLenum pname);

    /* Sync objects */
    WebGLSync? fenceSync(GLenum condition, GLbitfield flags);
    GLboolean isSync(WebGLSync? sync);
    void deleteSync(WebGLSync? sync);
    GLenum clientWaitSync(WebGLSync sync, GLbitfield flags, GLuint64 timeout);
    void waitSync(WebGLSync sync, GLbitfield flags, GLint64 timeout);
    [OverrideIDLType=IDLWebGLAny] any getSyncParameter(WebGLSync sync, GLenum pname);

    /* Transform Feedback */
    WebGLTransformFeedback? createTransformFeedback();
    void deleteTransformFeedback(WebGLTransformFeedback? id);
    GLboolean isTransformFeedback(WebGLTransformFeedback? id);
    void bindTransformFeedback(GLenum target, WebGLTransformFeedback? id);
    void beginTransformFeedback(GLenum primitiveMode);
    void endTransformFeedback();
    void transformFeedbackVaryings(WebGLProgram program, sequence<DOMString> varyings, GLenum bufferMode);
    WebGLActiveInfo? getTransformFeedbackVarying(WebGLProgram program, GLuint index);
    void pauseTransformFeedback();
    void resumeTransformFeedback();

    /* Uniform Buffer Objects and Transform Feedback Buffers */
    void bindBufferBase(GLenum target, GLuint index, WebGLBuffer? buffer);
    void bindBufferRange(GLenum target, GLuint index, WebGLBuffer? buffer, GLintptr offset, GLsizeiptr size);
    [OverrideIDLType=IDLWebGLAny] any getIndexedParameter(GLenum target, GLuint index);
    sequence<GLuint>? getUniformIndices(WebGLProgram program, sequence<DOMString> uniformNames);
    [OverrideIDLType=IDLWebGLAny] any getActiveUniforms(WebGLProgram program, sequence<GLuint> uniformIndices, GLenum pname);
    GLuint getUniformBlockIndex(WebGLProgram program, DOMString uniformBlockName);
    [OverrideIDLType=IDLWebGLAny] any getActiveUniformBlockParameter(WebGLProgram program, GLuint uniformBlockIndex, GLenum pname);
    [OverrideIDLType=IDLWebGLAny] DOMString? getActiveUniformBlockName(WebGLProgram program, GLuint uniformBlockIndex);
    void uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);

    /* Vertex Array Objects */
    WebGLVertexArrayObject? createVertexArray();
    void deleteVertexArray(WebGLVertexArrayObject? vertexArray);
    GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
    void bindVertexArray(WebGLVertexArrayObject? vertexArray);
};

WebGL2RenderingContext implements WebGLRenderingContextBase;