content: /*
   * Copyright 2013 Hannes Janetzek
   * Copyright 2019 Gustl22
   *
   * This file is part of the OpenScienceMap project (http://www.opensciencemap.org).
   *
   * This program is free software: you can redistribute it and/or modify it under the
   * terms of the GNU Lesser General Public License as published by the Free Software
   * Foundation, either version 3 of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public License along with
   * this program. If not, see <http://www.gnu.org/licenses/>.
   */
  /*******************************************************************************
   * Copyright 2011 See libgdx AUTHORS file.
   * <p/>
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * <p/>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p/>
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   ******************************************************************************/
  
  package org.oscim.backend;
  
  import java.nio.Buffer;
  import java.nio.FloatBuffer;
  import java.nio.IntBuffer;
  
  /**
   * Interface wrapping all the methods of OpenGL ES 2.0
   * <p>
   * See https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/GL20.java
   *
   * @author mzechner
   */
  public interface GL {
      public static final int ES_VERSION_2_0 = 1;
      public static final int DEPTH_BUFFER_BIT = 0x00000100;
      public static final int STENCIL_BUFFER_BIT = 0x00000400;
      public static final int COLOR_BUFFER_BIT = 0x00004000;
      public static final int FALSE = 0;
      public static final int TRUE = 1;
      public static final int POINTS = 0x0000;
      public static final int LINES = 0x0001;
      public static final int LINE_LOOP = 0x0002;
      public static final int LINE_STRIP = 0x0003;
      public static final int TRIANGLES = 0x0004;
      public static final int TRIANGLE_STRIP = 0x0005;
      public static final int TRIANGLE_FAN = 0x0006;
      public static final int ZERO = 0;
      public static final int ONE = 1;
      public static final int SRC_COLOR = 0x0300;
      public static final int ONE_MINUS_SRC_COLOR = 0x0301;
      public static final int SRC_ALPHA = 0x0302;
      public static final int ONE_MINUS_SRC_ALPHA = 0x0303;
      public static final int DST_ALPHA = 0x0304;
      public static final int ONE_MINUS_DST_ALPHA = 0x0305;
      public static final int DST_COLOR = 0x0306;
      public static final int ONE_MINUS_DST_COLOR = 0x0307;
      public static final int SRC_ALPHA_SATURATE = 0x0308;
      public static final int FUNC_ADD = 0x8006;
      public static final int BLEND_EQUATION = 0x8009;
      public static final int BLEND_EQUATION_RGB = 0x8009;
      public static final int BLEND_EQUATION_ALPHA = 0x883D;
      public static final int FUNC_SUBTRACT = 0x800A;
      public static final int FUNC_REVERSE_SUBTRACT = 0x800B;
      public static final int BLEND_DST_RGB = 0x80C8;
      public static final int BLEND_SRC_RGB = 0x80C9;
      public static final int BLEND_DST_ALPHA = 0x80CA;
      public static final int BLEND_SRC_ALPHA = 0x80CB;
      public static final int CONSTANT_COLOR = 0x8001;
      public static final int ONE_MINUS_CONSTANT_COLOR = 0x8002;
      public static final int CONSTANT_ALPHA = 0x8003;
      public static final int ONE_MINUS_CONSTANT_ALPHA = 0x8004;
      public static final int BLEND_COLOR = 0x8005;
      public static final int ARRAY_BUFFER = 0x8892;
      public static final int ELEMENT_ARRAY_BUFFER = 0x8893;
      public static final int ARRAY_BUFFER_BINDING = 0x8894;
      public static final int ELEMENT_ARRAY_BUFFER_BINDING = 0x8895;
      public static final int STREAM_DRAW = 0x88E0;
      public static final int STATIC_DRAW = 0x88E4;
      public static final int DYNAMIC_DRAW = 0x88E8;
      public static final int BUFFER_SIZE = 0x8764;
      public static final int BUFFER_USAGE = 0x8765;
      public static final int CURRENT_VERTEX_ATTRIB = 0x8626;
      public static final int FRONT = 0x0404;
      public static final int BACK = 0x0405;
      public static final int FRONT_AND_BACK = 0x0408;
      public static final int TEXTURE_2D = 0x0DE1;
      public static final int CULL_FACE = 0x0B44;
      public static final int BLEND = 0x0BE2;
      public static final int DITHER = 0x0BD0;
      public static final int STENCIL_TEST = 0x0B90;
      public static final int DEPTH_TEST = 0x0B71;
      public static final int SCISSOR_TEST = 0x0C11;
      public static final int POLYGON_OFFSET_FILL = 0x8037;
      public static final int SAMPLE_ALPHA_TO_COVERAGE = 0x809E;
      public static final int SAMPLE_COVERAGE = 0x80A0;
      public static final int NO_ERROR = 0;
      public static final int INVALID_ENUM = 0x0500;
      public static final int INVALID_VALUE = 0x0501;
      public static final int INVALID_OPERATION = 0x0502;
      public static final int OUT_OF_MEMORY = 0x0505;
      public static final int CW = 0x0900;
      public static final int CCW = 0x0901;
      public static final int LINE_WIDTH = 0x0B21;
      public static final int ALIASED_POINT_SIZE_RANGE = 0x846D;
      public static final int ALIASED_LINE_WIDTH_RANGE = 0x846E;
      public static final int CULL_FACE_MODE = 0x0B45;
      public static final int FRONT_FACE = 0x0B46;
      public static final int DEPTH_RANGE = 0x0B70;
      public static final int DEPTH_WRITEMASK = 0x0B72;
      public static final int DEPTH_CLEAR_VALUE = 0x0B73;
      public static final int DEPTH_FUNC = 0x0B74;
      public static final int STENCIL_CLEAR_VALUE = 0x0B91;
      public static final int STENCIL_FUNC = 0x0B92;
      public static final int STENCIL_FAIL = 0x0B94;
      public static final int STENCIL_PASS_DEPTH_FAIL = 0x0B95;
      public static final int STENCIL_PASS_DEPTH_PASS = 0x0B96;
      public static final int STENCIL_REF = 0x0B97;
      public static final int STENCIL_VALUE_MASK = 0x0B93;
      public static final int STENCIL_WRITEMASK = 0x0B98;
      public static final int STENCIL_BACK_FUNC = 0x8800;
      public static final int STENCIL_BACK_FAIL = 0x8801;
      public static final int STENCIL_BACK_PASS_DEPTH_FAIL = 0x8802;
      public static final int STENCIL_BACK_PASS_DEPTH_PASS = 0x8803;
      public static final int STENCIL_BACK_REF = 0x8CA3;
      public static final int STENCIL_BACK_VALUE_MASK = 0x8CA4;
      public static final int STENCIL_BACK_WRITEMASK = 0x8CA5;
      public static final int VIEWPORT = 0x0BA2;
      public static final int SCISSOR_BOX = 0x0C10;
      public static final int COLOR_CLEAR_VALUE = 0x0C22;
      public static final int COLOR_WRITEMASK = 0x0C23;
      public static final int UNPACK_ALIGNMENT = 0x0CF5;
      public static final int PACK_ALIGNMENT = 0x0D05;
      public static final int MAX_TEXTURE_SIZE = 0x0D33;
      public static final int MAX_TEXTURE_UNITS = 0x84E2;
      public static final int MAX_VIEWPORT_DIMS = 0x0D3A;
      public static final int SUBPIXEL_BITS = 0x0D50;
      public static final int RED_BITS = 0x0D52;
      public static final int GREEN_BITS = 0x0D53;
      public static final int BLUE_BITS = 0x0D54;
      public static final int ALPHA_BITS = 0x0D55;
      public static final int DEPTH_BITS = 0x0D56;
      public static final int STENCIL_BITS = 0x0D57;
      public static final int POLYGON_OFFSET_UNITS = 0x2A00;
      public static final int POLYGON_OFFSET_FACTOR = 0x8038;
      public static final int TEXTURE_BINDING_2D = 0x8069;
      public static final int SAMPLE_BUFFERS = 0x80A8;
      public static final int SAMPLES = 0x80A9;
      public static final int SAMPLE_COVERAGE_VALUE = 0x80AA;
      public static final int SAMPLE_COVERAGE_INVERT = 0x80AB;
      public static final int NUM_COMPRESSED_TEXTURE_FORMATS = 0x86A2;
      public static final int COMPRESSED_TEXTURE_FORMATS = 0x86A3;
      public static final int DONT_CARE = 0x1100;
      public static final int FASTEST = 0x1101;
      public static final int NICEST = 0x1102;
      public static final int GENERATE_MIPMAP = 0x8191;
      public static final int GENERATE_MIPMAP_HINT = 0x8192;
      public static final int BYTE = 0x1400;
      public static final int UNSIGNED_BYTE = 0x1401;
      public static final int SHORT = 0x1402;
      public static final int UNSIGNED_SHORT = 0x1403;
      public static final int INT = 0x1404;
      public static final int UNSIGNED_INT = 0x1405;
      public static final int FLOAT = 0x1406;
      public static final int FIXED = 0x140C;
      public static final int DEPTH_COMPONENT = 0x1902;
      public static final int ALPHA = 0x1906;
      public static final int RGB = 0x1907;
      public static final int RGBA = 0x1908;
      public static final int LUMINANCE = 0x1909;
      public static final int LUMINANCE_ALPHA = 0x190A;
      public static final int UNSIGNED_SHORT_4_4_4_4 = 0x8033;
      public static final int UNSIGNED_SHORT_5_5_5_1 = 0x8034;
      public static final int UNSIGNED_SHORT_5_6_5 = 0x8363;
      public static final int FRAGMENT_SHADER = 0x8B30;
      public static final int VERTEX_SHADER = 0x8B31;
      public static final int MAX_VERTEX_ATTRIBS = 0x8869;
      public static final int MAX_VERTEX_UNIFORM_VECTORS = 0x8DFB;
      public static final int MAX_VARYING_VECTORS = 0x8DFC;
      public static final int MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D;
      public static final int MAX_VERTEX_TEXTURE_IMAGE_UNITS = 0x8B4C;
      public static final int MAX_TEXTURE_IMAGE_UNITS = 0x8872;
      public static final int MAX_FRAGMENT_UNIFORM_VECTORS = 0x8DFD;
      public static final int SHADER_TYPE = 0x8B4F;
      public static final int DELETE_STATUS = 0x8B80;
      public static final int LINK_STATUS = 0x8B82;
      public static final int VALIDATE_STATUS = 0x8B83;
      public static final int ATTACHED_SHADERS = 0x8B85;
      public static final int ACTIVE_UNIFORMS = 0x8B86;
      public static final int ACTIVE_UNIFORM_MAX_LENGTH = 0x8B87;
      public static final int ACTIVE_ATTRIBUTES = 0x8B89;
      public static final int ACTIVE_ATTRIBUTE_MAX_LENGTH = 0x8B8A;
      public static final int SHADING_LANGUAGE_VERSION = 0x8B8C;
      public static final int CURRENT_PROGRAM = 0x8B8D;
      public static final int NEVER = 0x0200;
      public static final int LESS = 0x0201;
      public static final int EQUAL = 0x0202;
      public static final int LEQUAL = 0x0203;
      public static final int GREATER = 0x0204;
      public static final int NOTEQUAL = 0x0205;
      public static final int GEQUAL = 0x0206;
      public static final int ALWAYS = 0x0207;
      public static final int KEEP = 0x1E00;
      public static final int REPLACE = 0x1E01;
      public static final int INCR = 0x1E02;
      public static final int DECR = 0x1E03;
      public static final int INVERT = 0x150A;
      public static final int INCR_WRAP = 0x8507;
      public static final int DECR_WRAP = 0x8508;
      public static final int VENDOR = 0x1F00;
      public static final int RENDERER = 0x1F01;
      public static final int VERSION = 0x1F02;
      public static final int EXTENSIONS = 0x1F03;
      public static final int NEAREST = 0x2600;
      public static final int LINEAR = 0x2601;
      public static final int NEAREST_MIPMAP_NEAREST = 0x2700;
      public static final int LINEAR_MIPMAP_NEAREST = 0x2701;
      public static final int NEAREST_MIPMAP_LINEAR = 0x2702;
      public static final int LINEAR_MIPMAP_LINEAR = 0x2703;
      public static final int TEXTURE_MAG_FILTER = 0x2800;
      public static final int TEXTURE_MIN_FILTER = 0x2801;
      public static final int TEXTURE_WRAP_S = 0x2802;
      public static final int TEXTURE_WRAP_T = 0x2803;
      public static final int TEXTURE = 0x1702;
      public static final int TEXTURE_CUBE_MAP = 0x8513;
      public static final int TEXTURE_BINDING_CUBE_MAP = 0x8514;
      public static final int TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515;
      public static final int TEXTURE_CUBE_MAP_NEGATIVE_X = 0x8516;
      public static final int TEXTURE_CUBE_MAP_POSITIVE_Y = 0x8517;
      public static final int TEXTURE_CUBE_MAP_NEGATIVE_Y = 0x8518;
      public static final int TEXTURE_CUBE_MAP_POSITIVE_Z = 0x8519;
      public static final int TEXTURE_CUBE_MAP_NEGATIVE_Z = 0x851A;
      public static final int MAX_CUBE_MAP_TEXTURE_SIZE = 0x851C;
      public static final int TEXTURE0 = 0x84C0;
      public static final int TEXTURE1 = 0x84C1;
      public static final int TEXTURE2 = 0x84C2;
      public static final int TEXTURE3 = 0x84C3;
      public static final int TEXTURE4 = 0x84C4;
      public static final int TEXTURE5 = 0x84C5;
      public static final int TEXTURE6 = 0x84C6;
      public static final int TEXTURE7 = 0x84C7;
      public static final int TEXTURE8 = 0x84C8;
      public static final int TEXTURE9 = 0x84C9;
      public static final int TEXTURE10 = 0x84CA;
      public static final int TEXTURE11 = 0x84CB;
      public static final int TEXTURE12 = 0x84CC;
      public static final int TEXTURE13 = 0x84CD;
      public static final int TEXTURE14 = 0x84CE;
      public static final int TEXTURE15 = 0x84CF;
      public static final int TEXTURE16 = 0x84D0;
      public static final int TEXTURE17 = 0x84D1;
      public static final int TEXTURE18 = 0x84D2;
      public static final int TEXTURE19 = 0x84D3;
      public static final int TEXTURE20 = 0x84D4;
      public static final int TEXTURE21 = 0x84D5;
      public static final int TEXTURE22 = 0x84D6;
      public static final int TEXTURE23 = 0x84D7;
      public static final int TEXTURE24 = 0x84D8;
      public static final int TEXTURE25 = 0x84D9;
      public static final int TEXTURE26 = 0x84DA;
      public static final int TEXTURE27 = 0x84DB;
      public static final int TEXTURE28 = 0x84DC;
      public static final int TEXTURE29 = 0x84DD;
      public static final int TEXTURE30 = 0x84DE;
      public static final int TEXTURE31 = 0x84DF;
      public static final int ACTIVE_TEXTURE = 0x84E0;
      public static final int REPEAT = 0x2901;
      public static final int CLAMP_TO_EDGE = 0x812F;
      public static final int MIRRORED_REPEAT = 0x8370;
      public static final int FLOAT_VEC2 = 0x8B50;
      public static final int FLOAT_VEC3 = 0x8B51;
      public static final int FLOAT_VEC4 = 0x8B52;
      public static final int INT_VEC2 = 0x8B53;
      public static final int INT_VEC3 = 0x8B54;
      public static final int INT_VEC4 = 0x8B55;
      public static final int BOOL = 0x8B56;
      public static final int BOOL_VEC2 = 0x8B57;
      public static final int BOOL_VEC3 = 0x8B58;
      public static final int BOOL_VEC4 = 0x8B59;
      public static final int FLOAT_MAT2 = 0x8B5A;
      public static final int FLOAT_MAT3 = 0x8B5B;
      public static final int FLOAT_MAT4 = 0x8B5C;
      public static final int SAMPLER_2D = 0x8B5E;
      public static final int SAMPLER_CUBE = 0x8B60;
      public static final int VERTEX_ATTRIB_ARRAY_ENABLED = 0x8622;
      public static final int VERTEX_ATTRIB_ARRAY_SIZE = 0x8623;
      public static final int VERTEX_ATTRIB_ARRAY_STRIDE = 0x8624;
      public static final int VERTEX_ATTRIB_ARRAY_TYPE = 0x8625;
      public static final int VERTEX_ATTRIB_ARRAY_NORMALIZED = 0x886A;
      public static final int VERTEX_ATTRIB_ARRAY_POINTER = 0x8645;
      public static final int VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F;
      public static final int IMPLEMENTATION_COLOR_READ_TYPE = 0x8B9A;
      public static final int IMPLEMENTATION_COLOR_READ_FORMAT = 0x8B9B;
      public static final int COMPILE_STATUS = 0x8B81;
      public static final int INFO_LOG_LENGTH = 0x8B84;
      public static final int SHADER_SOURCE_LENGTH = 0x8B88;
      public static final int SHADER_COMPILER = 0x8DFA;
      public static final int SHADER_BINARY_FORMATS = 0x8DF8;
      public static final int NUM_SHADER_BINARY_FORMATS = 0x8DF9;
      public static final int LOW_FLOAT = 0x8DF0;
      public static final int MEDIUM_FLOAT = 0x8DF1;
      public static final int HIGH_FLOAT = 0x8DF2;
      public static final int LOW_INT = 0x8DF3;
      public static final int MEDIUM_INT = 0x8DF4;
      public static final int HIGH_INT = 0x8DF5;
      public static final int FRAMEBUFFER = 0x8D40;
      public static final int RENDERBUFFER = 0x8D41;
      public static final int RGBA4 = 0x8056;
      public static final int RGB5_A1 = 0x8057;
      public static final int RGB565 = 0x8D62;
      public static final int DEPTH_COMPONENT16 = 0x81A5;
      public static final int STENCIL_INDEX = 0x1901;
      public static final int STENCIL_INDEX8 = 0x8D48;
      public static final int RENDERBUFFER_WIDTH = 0x8D42;
      public static final int RENDERBUFFER_HEIGHT = 0x8D43;
      public static final int RENDERBUFFER_INTERNAL_FORMAT = 0x8D44;
      public static final int RENDERBUFFER_RED_SIZE = 0x8D50;
      public static final int RENDERBUFFER_GREEN_SIZE = 0x8D51;
      public static final int RENDERBUFFER_BLUE_SIZE = 0x8D52;
      public static final int RENDERBUFFER_ALPHA_SIZE = 0x8D53;
      public static final int RENDERBUFFER_DEPTH_SIZE = 0x8D54;
      public static final int RENDERBUFFER_STENCIL_SIZE = 0x8D55;
      public static final int FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = 0x8CD0;
      public static final int FRAMEBUFFER_ATTACHMENT_OBJECT_NAME = 0x8CD1;
      public static final int FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL = 0x8CD2;
      public static final int FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3;
      public static final int COLOR_ATTACHMENT0 = 0x8CE0;
      public static final int DEPTH_ATTACHMENT = 0x8D00;
      public static final int STENCIL_ATTACHMENT = 0x8D20;
      public static final int NONE = 0;
      public static final int FRAMEBUFFER_COMPLETE = 0x8CD5;
      public static final int FRAMEBUFFER_INCOMPLETE_ATTACHMENT = 0x8CD6;
      public static final int FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7;
      public static final int FRAMEBUFFER_INCOMPLETE_DIMENSIONS = 0x8CD9;
      public static final int FRAMEBUFFER_UNSUPPORTED = 0x8CDD;
      public static final int FRAMEBUFFER_BINDING = 0x8CA6;
      public static final int RENDERBUFFER_BINDING = 0x8CA7;
      public static final int MAX_RENDERBUFFER_SIZE = 0x84E8;
      public static final int INVALID_FRAMEBUFFER_OPERATION = 0x0506;
      public static final int VERTEX_PROGRAM_POINT_SIZE = 0x8642;
  
      // Extensions
      public static final int COVERAGE_BUFFER_BIT_NV = 0x8000;
      public static final int TEXTURE_MAX_ANISOTROPY_EXT = 0x84FE;
      public static final int MAX_TEXTURE_MAX_ANISOTROPY_EXT = 0x84FF;
  
      public void activeTexture(int texture);
  
      public void bindTexture(int target, int texture);
  
      public void blendFunc(int sfactor, int dfactor);
  
      public void clear(int mask);
  
      public void clearColor(float red, float green, float blue, float alpha);
  
      public void clearDepthf(float depth);
  
      public void clearStencil(int s);
  
      public void colorMask(boolean red, boolean green, boolean blue, boolean alpha);
  
      public void compressedTexImage2D(int target, int level, int internalformat, int width, int height, int border,
                                       int imageSize, Buffer data);
  
      public void compressedTexSubImage2D(int target, int level, int xoffset, int yoffset, int width, int height, int format,
                                          int imageSize, Buffer data);
  
      public void copyTexImage2D(int target, int level, int internalformat, int x, int y, int width, int height, int border);
  
      public void copyTexSubImage2D(int target, int level, int xoffset, int yoffset, int x, int y, int width, int height);
  
      public void cullFace(int mode);
  
      public void deleteTextures(int n, IntBuffer textures);
  
      public void deleteTexture(int texture);
  
      public void depthFunc(int func);
  
      public void depthMask(boolean flag);
  
      public void depthRangef(float zNear, float zFar);
  
      public void disable(int cap);
  
      public void drawArrays(int mode, int first, int count);
  
      public void drawElements(int mode, int count, int type, Buffer indices);
  
      public void enable(int cap);
  
      public void finish();
  
      public void flush();
  
      public void frontFace(int mode);
  
      public void genTextures(int n, IntBuffer textures);
  
      public int genTexture();
  
      public int getError();
  
      public void getIntegerv(int pname, IntBuffer params);
  
      public String getString(int name);
  
      public void hint(int target, int mode);
  
      public void lineWidth(float width);
  
      public void pixelStorei(int pname, int param);
  
      public void polygonOffset(float factor, float units);
  
      public void readPixels(int x, int y, int width, int height, int format, int type, Buffer pixels);
  
      public void scissor(int x, int y, int width, int height);
  
      public void stencilFunc(int func, int ref, int mask);
  
      public void stencilMask(int mask);
  
      public void stencilOp(int fail, int zfail, int zpass);
  
      public void texImage2D(int target, int level, int internalformat, int width, int height, int border, int format, int type,
                             Buffer pixels);
  
      public void texParameterf(int target, int pname, float param);
  
      public void texSubImage2D(int target, int level, int xoffset, int yoffset, int width, int height, int format, int type,
                                Buffer pixels);
  
      public void viewport(int x, int y, int width, int height);
  
      public void attachShader(int program, int shader);
  
      public void bindAttribLocation(int program, int index, String name);
  
      public void bindBuffer(int target, int buffer);
  
      public void bindFramebuffer(int target, int framebuffer);
  
      public void bindRenderbuffer(int target, int renderbuffer);
  
      public void blendColor(float red, float green, float blue, float alpha);
  
      public void blendEquation(int mode);
  
      public void blendEquationSeparate(int modeRGB, int modeAlpha);
  
      public void blendFuncSeparate(int srcRGB, int dstRGB, int srcAlpha, int dstAlpha);
  
      public void bufferData(int target, int size, Buffer data, int usage);
  
      public void bufferSubData(int target, int offset, int size, Buffer data);
  
      public int checkFramebufferStatus(int target);
  
      public void compileShader(int shader);
  
      public int createProgram();
  
      public int createShader(int type);
  
      public void deleteBuffer(int buffer);
  
      public void deleteBuffers(int n, IntBuffer buffers);
  
      public void deleteFramebuffer(int framebuffer);
  
      public void deleteFramebuffers(int n, IntBuffer framebuffers);
  
      public void deleteProgram(int program);
  
      public void deleteRenderbuffer(int renderbuffer);
  
      public void deleteRenderbuffers(int n, IntBuffer renderbuffers);
  
      public void deleteShader(int shader);
  
      public void detachShader(int program, int shader);
  
      public void disableVertexAttribArray(int index);
  
      public void drawElements(int mode, int count, int type, int indices);
  
      public void enableVertexAttribArray(int index);
  
      public void framebufferRenderbuffer(int target, int attachment, int renderbuffertarget, int renderbuffer);
  
      public void framebufferTexture2D(int target, int attachment, int textarget, int texture, int level);
  
      public int genBuffer();
  
      public void genBuffers(int n, IntBuffer buffers);
  
      public void generateMipmap(int target);
  
      public int genFramebuffer();
  
      public void genFramebuffers(int n, IntBuffer framebuffers);
  
      public int genRenderbuffer();
  
      public void genRenderbuffers(int n, IntBuffer renderbuffers);
  
      // deviates
      public String getActiveAttrib(int program, int index, IntBuffer size, Buffer type);
  
      // deviates
      public String getActiveUniform(int program, int index, IntBuffer size, Buffer type);
  
      public void getAttachedShaders(int program, int maxcount, Buffer count, IntBuffer shaders);
  
      public int getAttribLocation(int program, String name);
  
      public void getBooleanv(int pname, Buffer params);
  
      public void getBufferParameteriv(int target, int pname, IntBuffer params);
  
      public void getFloatv(int pname, FloatBuffer params);
  
      public void getFramebufferAttachmentParameteriv(int target, int attachment, int pname, IntBuffer params);
  
      public void getProgramiv(int program, int pname, IntBuffer params);
  
      // deviates
      public String getProgramInfoLog(int program);
  
      public void getRenderbufferParameteriv(int target, int pname, IntBuffer params);
  
      public void getShaderiv(int shader, int pname, IntBuffer params);
  
      // deviates
      public String getShaderInfoLog(int shader);
  
      public void getShaderPrecisionFormat(int shadertype, int precisiontype, IntBuffer range, IntBuffer precision);
  
      public void getTexParameterfv(int target, int pname, FloatBuffer params);
  
      public void getTexParameteriv(int target, int pname, IntBuffer params);
  
      public void getUniformfv(int program, int location, FloatBuffer params);
  
      public void getUniformiv(int program, int location, IntBuffer params);
  
      public int getUniformLocation(int program, String name);
  
      public void getVertexAttribfv(int index, int pname, FloatBuffer params);
  
      public void getVertexAttribiv(int index, int pname, IntBuffer params);
  
      public void getVertexAttribPointerv(int index, int pname, Buffer pointer);
  
      public boolean isBuffer(int buffer);
  
      public boolean isEnabled(int cap);
  
      public boolean isFramebuffer(int framebuffer);
  
      public boolean isProgram(int program);
  
      public boolean isRenderbuffer(int renderbuffer);
  
      public boolean isShader(int shader);
  
      public boolean isTexture(int texture);
  
      public void linkProgram(int program);
  
      public void releaseShaderCompiler();
  
      public void renderbufferStorage(int target, int internalformat, int width, int height);
  
      public void sampleCoverage(float value, boolean invert);
  
      public void shaderBinary(int n, IntBuffer shaders, int binaryformat, Buffer binary, int length);
  
      // Deviates
      public void shaderSource(int shader, String string);
  
      public void stencilFuncSeparate(int face, int func, int ref, int mask);
  
      public void stencilMaskSeparate(int face, int mask);
  
      public void stencilOpSeparate(int face, int fail, int zfail, int zpass);
  
      public void texParameterfv(int target, int pname, FloatBuffer params);
  
      public void texParameteri(int target, int pname, int param);
  
      public void texParameteriv(int target, int pname, IntBuffer params);
  
      public void uniform1f(int location, float x);
  
      public void uniform1fv(int location, int count, FloatBuffer v);
  
      public void uniform1fv(int location, int count, float v[], int offset);
  
      public void uniform1i(int location, int x);
  
      public void uniform1iv(int location, int count, IntBuffer v);
  
      public void uniform1iv(int location, int count, int v[], int offset);
  
      public void uniform2f(int location, float x, float y);
  
      public void uniform2fv(int location, int count, FloatBuffer v);
  
      public void uniform2fv(int location, int count, float v[], int offset);
  
      public void uniform2i(int location, int x, int y);
  
      public void uniform2iv(int location, int count, IntBuffer v);
  
      public void uniform2iv(int location, int count, int[] v, int offset);
  
      public void uniform3f(int location, float x, float y, float z);
  
      public void uniform3fv(int location, int count, FloatBuffer v);
  
      public void uniform3fv(int location, int count, float[] v, int offset);
  
      public void uniform3i(int location, int x, int y, int z);
  
      public void uniform3iv(int location, int count, IntBuffer v);
  
      public void uniform3iv(int location, int count, int v[], int offset);
  
      public void uniform4f(int location, float x, float y, float z, float w);
  
      public void uniform4fv(int location, int count, FloatBuffer v);
  
      public void uniform4fv(int location, int count, float v[], int offset);
  
      public void uniform4i(int location, int x, int y, int z, int w);
  
      public void uniform4iv(int location, int count, IntBuffer v);
  
      public void uniform4iv(int location, int count, int v[], int offset);
  
      public void uniformMatrix2fv(int location, int count, boolean transpose, FloatBuffer value);
  
      public void uniformMatrix2fv(int location, int count, boolean transpose, float value[], int offset);
  
      public void uniformMatrix3fv(int location, int count, boolean transpose, FloatBuffer value);
  
      public void uniformMatrix3fv(int location, int count, boolean transpose, float value[], int offset);
  
      public void uniformMatrix4fv(int location, int count, boolean transpose, FloatBuffer value);
  
      public void uniformMatrix4fv(int location, int count, boolean transpose, float value[], int offset);
  
      public void useProgram(int program);
  
      public void validateProgram(int program);
  
      public void vertexAttrib1f(int indx, float x);
  
      public void vertexAttrib1fv(int indx, FloatBuffer values);
  
      public void vertexAttrib2f(int indx, float x, float y);
  
      public void vertexAttrib2fv(int indx, FloatBuffer values);
  
      public void vertexAttrib3f(int indx, float x, float y, float z);
  
      public void vertexAttrib3fv(int indx, FloatBuffer values);
  
      public void vertexAttrib4f(int indx, float x, float y, float z, float w);
  
      public void vertexAttrib4fv(int indx, FloatBuffer values);
  
      /**
       * In Open core profiles  (3.1+), passing a pointer to client memory is not valid.
       * In 3.0 and later, use the other version of this function instead, pass a zero-based
       * offset which references the buffer currently bound to ARRAY_BUFFER.
       */
      public void vertexAttribPointer(int indx, int size, int type, boolean normalized, int stride, Buffer ptr);
  
      public void vertexAttribPointer(int indx, int size, int type, boolean normalized, int stride, int ptr);
  }
  
  