lib/glesv2/glesv2.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2014 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # OpenGL graphics rendering library for embedded systems, version 2.0
  18 #
  19 # This is a low-level wrapper, it can be useful for developers already familiar
  20 # with the C API of OpenGL. Most developers will prefer to use higher level
  21 # wrappers such as `mnit` and `gammit`.
  22 #
  23 # Defines the annotations `glsl_vertex_shader` and `glsl_fragment_shader`
  24 # applicable on string literals to check shader code using `glslangValidator`.
  25 # The tool must be in PATH. It can be downloaded from
  26 # https://www.khronos.org/opengles/sdk/tools/Reference-Compiler/
  27 #
  28 # Most services of this module are a direct wrapper of the underlying
  29 # C library. If a method or class is not documented in Nit, refer to
  30 # the official documentation by the Khronos Group at:
  31 # http://www.khronos.org/opengles/sdk/docs/man/
  32 module glesv2 is
  33         pkgconfig
  34         new_annotation glsl_vertex_shader
  35         new_annotation glsl_fragment_shader
  36         ldflags("-lGLESv2")@android
  37 end
  38
  39 import android::aware
  40 intrude import c
  41
  42 in "C Header" `{
  43         #include <GLES2/gl2.h>
  44 `}
  45
  46 # OpenGL ES program to which we attach shaders
  47 extern class GLProgram `{GLuint`}
  48         # Create a new program
  49         #
  50         # The newly created instance should be checked using `is_ok`.
  51         new `{ return glCreateProgram(); `}
  52
  53         # Set the location for the attribute by `name`
  54         fun bind_attrib_location(index: Int, name: String) import String.to_cstring `{
  55                 GLchar *c_name = String_to_cstring(name);
  56                 glBindAttribLocation(self, index, c_name);
  57         `}
  58
  59         # Get the location of the attribute by `name`
  60         #
  61         # Returns `-1` if there is no active attribute named `name`.
  62         fun attrib_location(name: String): Int import String.to_cstring `{
  63                 GLchar *c_name = String_to_cstring(name);
  64                 return glGetAttribLocation(self, c_name);
  65         `}
  66
  67         # Get the location of the uniform by `name`
  68         #
  69         # Returns `-1` if there is no active uniform named `name`.
  70         fun uniform_location(name: String): Int import String.to_cstring `{
  71                 GLchar *c_name = String_to_cstring(name);
  72                 return glGetUniformLocation(self, c_name);
  73         `}
  74
  75         # Query information on this program
  76         fun query(pname: Int): Int `{
  77                 int val;
  78                 glGetProgramiv(self, pname, &val);
  79                 return val;
  80         `}
  81
  82         # Is this program linked?
  83         fun is_linked: Bool do return query(0x8B82) != 0
  84
  85         # Has this program been deleted?
  86         fun is_deleted: Bool do return query(0x8B80) != 0
  87
  88         # Boolean result of `validate`, must be called after `validate`
  89         fun is_validated: Bool do return query(0x8B83) != 0
  90
  91         # Retrieve the information log of this program
  92         #
  93         # Useful with `link` and `validate`
  94         fun info_log: String import NativeString.to_s `{
  95                 int size;
  96                 glGetProgramiv(self, GL_INFO_LOG_LENGTH, &size);
  97                 GLchar *msg = malloc(size);
  98                 glGetProgramInfoLog(self, size, NULL, msg);
  99                 return NativeString_to_s(msg);
 100         `}
 101
 102         # Number of active uniform in this program
 103         #
 104         # This should be the number of uniforms declared in all shader, except
 105         # unused uniforms which may have been optimized out.
 106         fun n_active_uniforms: Int do return query(0x8B86)
 107
 108         # Length of the longest uniform name in this program, including `\n`
 109         fun active_uniform_max_length: Int do return query(0x8B87)
 110
 111         # Number of active attributes in this program
 112         #
 113         # This should be the number of uniforms declared in all shader, except
 114         # unused uniforms which may have been optimized out.
 115         fun n_active_attributes: Int do return query(0x8B89)
 116
 117         # Length of the longest uniform name in this program, including `\n`
 118         fun active_attribute_max_length: Int do return query(0x8B8A)
 119
 120         # Number of shaders attached to this program
 121         fun n_attached_shaders: Int do return query(0x8B85)
 122
 123         # Name of the active attribute at `index`
 124         fun active_attrib_name(index: Int): String
 125         do
 126                 var max_size = active_attribute_max_length
 127                 return active_attrib_name_native(index, max_size).to_s
 128         end
 129         private fun active_attrib_name_native(index, max_size: Int): NativeString `{
 130                 // We get more values than we need, for compatibility. At least the
 131                 // NVidia driver tries to fill them even if NULL.
 132
 133                 char *name = malloc(max_size);
 134                 int size;
 135                 GLenum type;
 136                 glGetActiveAttrib(self, index, max_size, NULL, &size, &type, name);
 137                 return name;
 138         `}
 139
 140         # Size of the active attribute at `index`
 141         fun active_attrib_size(index: Int): Int `{
 142                 int size;
 143                 GLenum type;
 144                 glGetActiveAttrib(self, index, 0, NULL, &size, &type, NULL);
 145                 return size;
 146         `}
 147
 148         # Type of the active attribute at `index`
 149         #
 150         # May only be float related data types (single float, vectors and matrix).
 151         fun active_attrib_type(index: Int): GLFloatDataType `{
 152                 int size;
 153                 GLenum type;
 154                 glGetActiveAttrib(self, index, 0, NULL, &size, &type, NULL);
 155                 return type;
 156         `}
 157
 158         # Name of the active uniform at `index`
 159         fun active_uniform_name(index: Int): String
 160         do
 161                 var max_size = active_attribute_max_length
 162                 return active_uniform_name_native(index, max_size).to_s
 163         end
 164         private fun active_uniform_name_native(index, max_size: Int): NativeString `{
 165                 char *name = malloc(max_size);
 166                 int size;
 167                 GLenum type;
 168                 glGetActiveUniform(self, index, max_size, NULL, &size, &type, name);
 169                 return name;
 170         `}
 171
 172         # Size of the active uniform at `index`
 173         fun active_uniform_size(index: Int): Int `{
 174                 int size;
 175                 GLenum type;
 176                 glGetActiveUniform(self, index, 0, NULL, &size, &type, NULL);
 177                 return size;
 178         `}
 179
 180         # Type of the active uniform at `index`
 181         #
 182         # May be any data type supported by OpenGL ES 2.0 shaders.
 183         fun active_uniform_type(index: Int): GLDataType `{
 184                 int size;
 185                 GLenum type = 0;
 186                 glGetActiveUniform(self, index, 0, NULL, &size, &type, NULL);
 187                 return type;
 188         `}
 189 end
 190
 191 # Create a program object
 192 fun glCreateProgram: GLProgram `{ return glCreateProgram(); `}
 193
 194 # Install the `program` as part of current rendering state
 195 fun glUseProgram(program: GLProgram) `{ glUseProgram(program); `}
 196
 197 # Link the `program` object
 198 fun glLinkProgram(program: GLProgram) `{ glLinkProgram(program); `}
 199
 200 # Validate the `program` object
 201 fun glValidateProgram(program: GLProgram) `{ glValidateProgram(program); `}
 202
 203 # Delete the `program` object
 204 fun glDeleteProgram(program: GLProgram) `{ glDeleteProgram(program); `}
 205
 206 # Determine if `name` corresponds to a program object
 207 fun glIsProgram(name: GLProgram): Bool `{ return glIsProgram(name); `}
 208
 209 # Attach a `shader` to `program`
 210 fun glAttachShader(program: GLProgram, shader: GLShader) `{ glAttachShader(program, shader); `}
 211
 212 # Detach `shader` from `program`
 213 fun glDetachShader(program: GLProgram, shader: GLShader) `{ glDetachShader(program, shader); `}
 214
 215 # Abstract OpenGL ES shader object, implemented by `GLFragmentShader` and `GLVertexShader`
 216 extern class GLShader `{GLuint`}
 217
 218         # Source of the shader, if available
 219         #
 220         # Returns `null` if the source is not available, usually when the shader
 221         # was created from a binary file.
 222         fun source: nullable String
 223         do
 224                 var size = query(0x8B88)
 225                 if size == 0 then return null
 226                 return source_native(size).to_s
 227         end
 228
 229         private fun source_native(size: Int): NativeString `{
 230                 GLchar *code = malloc(size);
 231                 glGetShaderSource(self, size, NULL, code);
 232                 return code;
 233         `}
 234
 235         # Query information on this shader
 236         protected fun query(pname: Int): Int `{
 237                 int val;
 238                 glGetShaderiv(self, pname, &val);
 239                 return val;
 240         `}
 241
 242         # Has this shader been compiled?
 243         fun is_compiled: Bool do return query(0x8B81) != 0
 244
 245         # Has this shader been deleted?
 246         fun is_deleted: Bool do return query(0x8B80) != 0
 247
 248         # Retrieve the information log of this shader
 249         #
 250         # Useful with `link` and `validate`
 251         fun info_log: String import NativeString.to_s `{
 252                 int size;
 253                 glGetShaderiv(self, GL_INFO_LOG_LENGTH, &size);
 254                 GLchar *msg = malloc(size);
 255                 glGetShaderInfoLog(self, size, NULL, msg);
 256                 return NativeString_to_s(msg);
 257         `}
 258 end
 259
 260 # Shader type
 261 extern class GLShaderType
 262         super GLEnum
 263 end
 264
 265 fun gl_VERTEX_SHADER: GLShaderType `{ return GL_VERTEX_SHADER; `}
 266 fun gl_FRAGMENT_SHADER: GLShaderType `{ return GL_FRAGMENT_SHADER; `}
 267
 268 # Create a shader object of the `shader_type`
 269 fun glCreateShader(shader_type: GLShaderType): GLShader `{
 270         return glCreateShader(shader_type);
 271 `}
 272
 273 # Replace the source code in the `shader` object with `code`
 274 fun glShaderSource(shader: GLShader, code: NativeString) `{
 275         glShaderSource(shader, 1, (GLchar const **)&code, NULL);
 276 `}
 277
 278 # Compile the `shader` object
 279 fun glCompileShader(shader: GLShader) `{ glCompileShader(shader); `}
 280
 281 # Delete the `shader` object
 282 fun glDeleteShader(shader: GLShader) `{ glDeleteShader(shader); `}
 283
 284 # Determine if `name` corresponds to a shader object
 285 fun glIsShader(name: GLShader): Bool `{ return glIsShader(name); `}
 286
 287 # An OpenGL ES 2.0 fragment shader
 288 extern class GLFragmentShader
 289         super GLShader
 290
 291         # Create a new fragment shader
 292         #
 293         # The newly created instance should be checked using `is_ok`.
 294         new `{ return glCreateShader(GL_FRAGMENT_SHADER); `}
 295 end
 296
 297 # An OpenGL ES 2.0 vertex shader
 298 extern class GLVertexShader
 299         super GLShader
 300
 301         # Create a new fragment shader
 302         #
 303         # The newly created instance should be checked using `is_ok`.
 304         new `{ return glCreateShader(GL_VERTEX_SHADER); `}
 305 end
 306
 307 # An array of `Float` associated to a program variable
 308 class VertexArray
 309         var index: Int
 310
 311         # Number of data per vertex
 312         var count: Int
 313
 314         protected var glfloat_array: NativeGLfloatArray
 315
 316         init(index, count: Int, array: Array[Float])
 317         do
 318                 self.index = index
 319                 self.count = count
 320                 self.glfloat_array = new NativeGLfloatArray(array.length)
 321                 for k in [0..array.length[ do
 322                         glfloat_array[k] = array[k]
 323                 end
 324         end
 325
 326         fun attrib_pointer do attrib_pointer_intern(index, count, glfloat_array)
 327         private fun attrib_pointer_intern(index, count: Int, array: NativeGLfloatArray) `{
 328                 glVertexAttribPointer(index, count, GL_FLOAT, GL_FALSE, 0, array);
 329         `}
 330
 331         # Enable this vertex attribute array
 332         fun enable do glEnableVertexAttribArray(index)
 333
 334         # Disable this vertex attribute array
 335         fun disable do glDisableVertexAttribArray(index)
 336 end
 337
 338 # Enable the generic vertex attribute array at `index`
 339 fun glEnableVertexAttribArray(index: Int) `{ glEnableVertexAttribArray(index); `}
 340
 341 # Disable the generic vertex attribute array at `index`
 342 fun glDisableVertexAttribArray(index: Int) `{ glDisableVertexAttribArray(index); `}
 343
 344 # Render primitives from array data
 345 fun glDrawArrays(mode: GLDrawMode, from, count: Int) `{ glDrawArrays(mode, from, count); `}
 346
 347 # Define an array of generic vertex attribute data
 348 fun glVertexAttribPointer(index, size: Int, typ: GLDataType, normalized: Bool, stride: Int, array: NativeGLfloatArray) `{
 349         glVertexAttribPointer(index, size, typ, normalized, stride, array);
 350 `}
 351
 352 # Specify the value of a generic vertex attribute
 353 fun glVertexAttrib1f(index: Int, x: Float) `{ glVertexAttrib1f(index, x); `}
 354
 355 # Specify the value of a generic vertex attribute
 356 fun glVertexAttrib2f(index: Int, x, y: Float) `{ glVertexAttrib2f(index, x, y); `}
 357
 358 # Specify the value of a generic vertex attribute
 359 fun glVertexAttrib3f(index: Int, x, y, z: Float) `{ glVertexAttrib3f(index, x, y, z); `}
 360
 361 # Specify the value of a generic vertex attribute
 362 fun glVertexAttrib4f(index: Int, x, y, z, w: Float) `{ glVertexAttrib4f(index, x, y, z, w); `}
 363
 364 # Specify the value of a uniform variable for the current program object
 365 fun glUniform1i(index, x: Int) `{ glUniform1i(index, x); `}
 366
 367 # Specify the value of a uniform variable for the current program object
 368 fun glUniform2i(index, x, y: Int) `{ glUniform2i(index, x, y); `}
 369
 370 # Specify the value of a uniform variable for the current program object
 371 fun glUniform3i(index, x, y, z: Int) `{ glUniform3i(index, x, y, z); `}
 372
 373 # Specify the value of a uniform variable for the current program object
 374 fun glUniform4i(index, x, y, z, w: Int) `{ glUniform4i(index, x, y, z, w); `}
 375
 376 # TODO glUniform*f
 377
 378 # Low level array of `Float`
 379 class GLfloatArray
 380         super CArray[Float]
 381         redef type NATIVE: NativeGLfloatArray
 382
 383         init do native_array = new NativeGLfloatArray(length)
 384
 385         # Create with the content of `array`
 386         new from(array: Array[Float])
 387         do
 388                 var arr = new GLfloatArray(array.length)
 389                 arr.fill_from array
 390                 return arr
 391         end
 392
 393         # Fill with the content of `array`
 394         fun fill_from(array: Array[Float])
 395         do
 396                 assert length >= array.length
 397                 for k in [0..array.length[ do
 398                         self[k] = array[k]
 399                 end
 400         end
 401 end
 402
 403 # An array of `GLfloat` in C (`GLfloat*`)
 404 extern class NativeGLfloatArray `{ GLfloat* `}
 405         super NativeCArray
 406         redef type E: Float
 407
 408         new(size: Int) `{ return calloc(size, sizeof(GLfloat)); `}
 409
 410         redef fun [](index) `{ return self[index]; `}
 411         redef fun []=(index, val) `{ self[index] = val; `}
 412
 413         redef fun +(offset) `{ return self + offset; `}
 414 end
 415
 416 # General type for OpenGL enumerations
 417 extern class GLEnum `{ GLenum `}
 418
 419         redef fun hash `{ return self; `}
 420
 421         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 422 end
 423
 424 # Error information
 425 fun glGetError: GLError `{ return glGetError(); `}
 426
 427 # An OpenGL ES 2.0 error code
 428 extern class GLError
 429         super GLEnum
 430
 431         redef fun to_s
 432         do
 433                 if self == gl_NO_ERROR then return "No error"
 434                 if self == gl_INVALID_ENUM then return "Invalid enum"
 435                 if self == gl_INVALID_VALUE then return "Invalid value"
 436                 if self == gl_INVALID_OPERATION then return "Invalid operation"
 437                 if self == gl_INVALID_FRAMEBUFFER_OPERATION then return "invalid framebuffer operation"
 438                 if self == gl_OUT_OF_MEMORY then return "Out of memory"
 439                 return "Unknown error"
 440         end
 441 end
 442
 443 fun gl_NO_ERROR: GLError `{ return GL_NO_ERROR; `}
 444 fun gl_INVALID_ENUM: GLError `{ return GL_INVALID_ENUM; `}
 445 fun gl_INVALID_VALUE: GLError `{ return GL_INVALID_VALUE; `}
 446 fun gl_INVALID_OPERATION: GLError `{ return GL_INVALID_OPERATION; `}
 447 fun gl_INVALID_FRAMEBUFFER_OPERATION: GLError `{ return GL_INVALID_FRAMEBUFFER_OPERATION; `}
 448 fun gl_OUT_OF_MEMORY: GLError `{ return GL_OUT_OF_MEMORY; `}
 449
 450 fun assert_no_gl_error
 451 do
 452         var error = glGetError
 453         if not error == gl_NO_ERROR then
 454                 print "GL error: {error}"
 455                 abort
 456         end
 457 end
 458
 459 # Texture unit, the number of texture units is implementation dependent
 460 extern class GLTextureUnit
 461         super GLEnum
 462 end
 463
 464 fun gl_TEXTURE0: GLTextureUnit `{ return GL_TEXTURE0; `}
 465 fun gl_TEXTURE1: GLTextureUnit `{ return GL_TEXTURE1; `}
 466 fun gl_TEXTURE2: GLTextureUnit `{ return GL_TEXTURE2; `}
 467 fun gl_TEXTURE3: GLTextureUnit `{ return GL_TEXTURE3; `}
 468 fun gl_TEXTURE4: GLTextureUnit `{ return GL_TEXTURE4; `}
 469 fun gl_TEXTURE5: GLTextureUnit `{ return GL_TEXTURE5; `}
 470 fun gl_TEXTURE6: GLTextureUnit `{ return GL_TEXTURE6; `}
 471 fun gl_TEXTURE7: GLTextureUnit `{ return GL_TEXTURE7; `}
 472 fun gl_TEXTURE8: GLTextureUnit `{ return GL_TEXTURE8; `}
 473 fun gl_TEXTURE9: GLTextureUnit `{ return GL_TEXTURE9; `}
 474 fun gl_TEXTURE10: GLTextureUnit `{ return GL_TEXTURE10; `}
 475 fun gl_TEXTURE11: GLTextureUnit `{ return GL_TEXTURE11; `}
 476 fun gl_TEXTURE12: GLTextureUnit `{ return GL_TEXTURE12; `}
 477 fun gl_TEXTURE13: GLTextureUnit `{ return GL_TEXTURE13; `}
 478 fun gl_TEXTURE14: GLTextureUnit `{ return GL_TEXTURE14; `}
 479 fun gl_TEXTURE15: GLTextureUnit `{ return GL_TEXTURE15; `}
 480 fun gl_TEXTURE16: GLTextureUnit `{ return GL_TEXTURE16; `}
 481 fun gl_TEXTURE17: GLTextureUnit `{ return GL_TEXTURE17; `}
 482 fun gl_TEXTURE18: GLTextureUnit `{ return GL_TEXTURE18; `}
 483 fun gl_TEXTURE19: GLTextureUnit `{ return GL_TEXTURE19; `}
 484 fun gl_TEXTURE20: GLTextureUnit `{ return GL_TEXTURE20; `}
 485 fun gl_TEXTURE21: GLTextureUnit `{ return GL_TEXTURE21; `}
 486 fun gl_TEXTURE22: GLTextureUnit `{ return GL_TEXTURE22; `}
 487 fun gl_TEXTURE23: GLTextureUnit `{ return GL_TEXTURE23; `}
 488 fun gl_TEXTURE24: GLTextureUnit `{ return GL_TEXTURE24; `}
 489 fun gl_TEXTURE25: GLTextureUnit `{ return GL_TEXTURE25; `}
 490 fun gl_TEXTURE26: GLTextureUnit `{ return GL_TEXTURE26; `}
 491 fun gl_TEXTURE27: GLTextureUnit `{ return GL_TEXTURE27; `}
 492 fun gl_TEXTURE28: GLTextureUnit `{ return GL_TEXTURE28; `}
 493 fun gl_TEXTURE29: GLTextureUnit `{ return GL_TEXTURE29; `}
 494 fun gl_TEXTURE30: GLTextureUnit `{ return GL_TEXTURE30; `}
 495 fun gl_TEXTURE31: GLTextureUnit `{ return GL_TEXTURE31; `}
 496
 497 # Texture unit at `offset` after `gl_TEXTURE0`
 498 fun gl_TEXTURE(offset: Int): GLTextureUnit `{ return GL_TEXTURE0 + offset; `}
 499
 500 # Generate `n` texture names
 501 fun glGenTextures(n: Int): Array[Int]
 502 do
 503         var array = new CIntArray(n)
 504         native_glGenTextures(n, array.native_array)
 505         var a = array.to_a
 506         array.destroy
 507         return a
 508 end
 509
 510 private fun native_glGenTextures(n: Int, textures: NativeCIntArray) `{
 511         glGenTextures(n, (GLuint*)textures);
 512 `}
 513
 514 # Select server-side active texture unit
 515 fun glActiveTexture(texture: GLTextureUnit) `{ glActiveTexture(texture); `}
 516
 517 # Bind the named `texture` to a `target`
 518 fun glBindTexture(target: GLTextureTarget, texture: Int) `{
 519         glBindTexture(target, texture);
 520 `}
 521
 522 # Delete named textures
 523 fun glDeleteTextures(textures: SequenceRead[Int])
 524 do
 525         var n = textures.length
 526         var array = new CIntArray.from(textures)
 527         native_glDeleteTextures(n, array.native_array)
 528         array.destroy
 529 end
 530
 531 private fun native_glDeleteTextures(n: Int, textures: NativeCIntArray) `{
 532         glDeleteTextures(n, (const GLuint *)textures);
 533 `}
 534
 535 # Does `name` corresponds to a texture?
 536 fun glIsTexture(name: Int): Bool `{ return glIsTexture(name); `}
 537
 538 # Set pixel storage modes
 539 fun glPixelStorei(parameter: GLPack, val: Int) `{ glPixelStorei(parameter, val); `}
 540
 541 # Symbolic name of the parameter to be set with `glPixelStorei`
 542 extern class GLPack
 543         super GLEnum
 544 end
 545
 546 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 547 fun gl_PACK_ALIGNEMENT: GLPack `{ return GL_PACK_ALIGNMENT; `}
 548
 549 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 550 fun gl_UNPACK_ALIGNEMENT: GLPack `{ return GL_UNPACK_ALIGNMENT; `}
 551
 552 # TODO GL_PACK_ROW_LENGTH, GL_PACK_IMAGE_HEIGHT, GL_PACK_SKIP_PIXELS, GL_PACK_SKIP_ROWS, GL_PACK_SKIP_IMAGES
 553 # GL_UNPACK_ROW_LENGTH, GL_UNPACK_IMAGE_HEIGHT, GL_UNPACK_SKIP_PIXELS, GL_UNPACK_SKIP_ROWS, GL_UNPACK_SKIP_IMAGES
 554
 555 # Specify a two-dimensional texture image
 556 fun glTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 557                  width, height, border: Int,
 558                  format: GLPixelFormat, typ: GLPixelType, data: Pointer) `{
 559         glTexImage2D(target, level, internalformat, width, height, border, format, typ, data);
 560 `}
 561
 562 # Specify a two-dimensional texture subimage
 563 fun glTexSubImage2D(target: GLTextureTarget,
 564                     level, xoffset, yoffset, width, height, border: Int,
 565                     format: GLPixelFormat, typ: GLPixelType, data: Pointer) `{
 566         glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, typ, data);
 567 `}
 568
 569 # Copy pixels into a 2D texture image
 570 fun glCopyTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 571                      x, y, width, height, border: Int) `{
 572         glCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
 573 `}
 574
 575 # Copy a two-dimensional texture subimage
 576 fun glCopyTexSubImage2D(target: GLTextureTarget, level, xoffset, yoffset, x, y, width, height: Int) `{
 577         glCopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
 578 `}
 579
 580 # Copy a block of pixels from the framebuffer of `fomat` and `typ` at `data`
 581 fun glReadPixels(x, y, width, height: Int, format: GLPixelFormat, typ: GLPixelType, data: Pointer) `{
 582         glReadPixels(x, y, width, height, format, typ, data);
 583 `}
 584
 585 # Texture minifying and magnifying function
 586 extern class GLTexParameteri
 587         super GLEnum
 588 end
 589
 590 fun gl_NEAREST: GLTexParameteri `{ return GL_NEAREST; `}
 591 fun gl_LINEAR: GLTexParameteri `{ return GL_LINEAR; `}
 592 fun gl_NEAREST_MIPMAP_NEAREST: GLTexParameteri `{ return GL_NEAREST_MIPMAP_NEAREST; `}
 593 fun gl_LINEAR_MIPMAP_NEAREST: GLTexParameteri `{ return GL_LINEAR_MIPMAP_NEAREST; `}
 594 fun gl_NEAREST_MIPMAP_NINEAR: GLTexParameteri `{ return GL_NEAREST_MIPMAP_LINEAR; `}
 595 fun gl_LINEAR_MIPMAP_LINEAR: GLTexParameteri `{ return GL_LINEAR_MIPMAP_LINEAR; `}
 596 fun gl_CLAMP_TO_EDGE: GLTexParameteri `{ return GL_CLAMP_TO_EDGE; `}
 597 fun gl_MIRRORED_REPEAT: GLTexParameteri `{ return GL_MIRRORED_REPEAT; `}
 598 fun gl_REPEAT: GLTexParameteri `{ return GL_REPEAT; `}
 599
 600 # Target texture
 601 extern class GLTextureTarget
 602         super GLEnum
 603 end
 604
 605 # Two-dimensional texture
 606 fun gl_TEXTURE_2D: GLTextureTarget `{ return GL_TEXTURE_2D; `}
 607
 608 # Cube map texture
 609 fun gl_TEXTURE_CUBE_MAP: GLTextureTarget `{ return GL_TEXTURE_CUBE_MAP; `}
 610
 611 # TODO GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 612 # GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
 613
 614 # A server-side capability
 615 class GLCap
 616
 617         # TODO private init
 618
 619         # Internal OpenGL integer for this capability
 620         private var val: Int
 621
 622         # Enable this server-side capability
 623         fun enable do enable_native(val)
 624         private fun enable_native(cap: Int) `{ glEnable(cap); `}
 625
 626         # Disable this server-side capability
 627         fun disable do disable_native(val)
 628         private fun disable_native(cap: Int) `{ glDisable(cap); `}
 629
 630         redef fun hash do return val
 631         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 632 end
 633
 634 # Generate `n` renderbuffer object names
 635 fun glGenRenderbuffers(n: Int): Array[Int]
 636 do
 637         var array = new CIntArray(n)
 638         native_glGenRenderbuffers(n, array.native_array)
 639         var a = array.to_a
 640         array.destroy
 641         return a
 642 end
 643
 644 private fun native_glGenRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 645         glGenRenderbuffers(n, (GLuint *)renderbuffers);
 646 `}
 647
 648 # Determine if `name` corresponds to a renderbuffer object
 649 fun glIsRenderbuffer(name: Int): Bool `{
 650         return glIsRenderbuffer(name);
 651 `}
 652
 653 # Delete named renderbuffer objects
 654 fun glDeleteRenderbuffers(renderbuffers: SequenceRead[Int])
 655 do
 656         var n = renderbuffers.length
 657         var array = new CIntArray.from(renderbuffers)
 658         native_glDeleteRenderbuffers(n, array.native_array)
 659         array.destroy
 660 end
 661
 662 private fun native_glDeleteRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 663         return glDeleteRenderbuffers(n, (const GLuint *)renderbuffers);
 664 `}
 665
 666 # Attach a renderbuffer object to a framebuffer object
 667 fun glFramebufferRenderbuffer(target: GLFramebufferTarget, attachment: GLAttachment,
 668                               renderbuffertarget: GLRenderbufferTarget, renderbuffer: Int) `{
 669         glFramebufferRenderbuffer(target, attachment, renderbuffertarget, renderbuffer);
 670 `}
 671
 672 # Establish data storage, `format` and dimensions of the `target` renderbuffer object's image
 673 fun glRenderbufferStorage(target: GLRenderbufferTarget, format: GLRenderbufferFormat, width, height: Int) `{
 674         glRenderbufferStorage(GL_RENDERBUFFER, format, width, height);
 675 `}
 676
 677 # Format for a renderbuffer
 678 extern class GLRenderbufferFormat
 679         super GLEnum
 680 end
 681
 682 # 4 red, 4 green, 4 blue, 4 alpha bits format
 683 fun gl_RGBA4: GLRenderbufferFormat `{ return GL_RGBA4; `}
 684
 685 # 5 red, 6 green, 5 blue bits format
 686 fun gl_RGB565: GLRenderbufferFormat `{ return GL_RGB565; `}
 687
 688 # 5 red, 5 green, 5 blue, 1 alpha bits format
 689 fun gl_RGB_A1: GLRenderbufferFormat `{ return GL_RGB5_A1; `}
 690
 691 # 16 depth bits format
 692 fun gl_DEPTH_COMPNENT16: GLRenderbufferFormat `{ return GL_DEPTH_COMPONENT16; `}
 693
 694 # 8 stencil bits format
 695 fun gl_STENCIL_INDEX8: GLRenderbufferFormat `{ return GL_STENCIL_INDEX8; `}
 696
 697 # Renderbuffer attachment point to a framebuffer
 698 extern class GLAttachment
 699         super GLEnum
 700 end
 701
 702 # First color attachment point
 703 fun gl_COLOR_ATTACHMENT0: GLAttachment `{ return GL_COLOR_ATTACHMENT0; `}
 704
 705 # Depth attachment point
 706 fun gl_DEPTH_ATTACHMENT: GLAttachment `{ return GL_DEPTH_ATTACHMENT; `}
 707
 708 # Stencil attachment
 709 fun gl_STENCIL_ATTACHMENT: GLAttachment `{ return GL_STENCIL_ATTACHMENT; `}
 710
 711 redef class Sys
 712         private var gles = new GLES is lazy
 713 end
 714
 715 # Entry points to OpenGL ES 2.0 services
 716 fun gl: GLES do return sys.gles
 717
 718 # OpenGL ES 2.0 services
 719 class GLES
 720
 721         # Query the boolean value at `key`
 722         private fun get_bool(key: Int): Bool `{
 723                 GLboolean val;
 724                 glGetBooleanv(key, &val);
 725                 return val == GL_TRUE;
 726         `}
 727
 728         # Query the floating point value at `key`
 729         private fun get_float(key: Int): Float `{
 730                 GLfloat val;
 731                 glGetFloatv(key, &val);
 732                 return val;
 733         `}
 734
 735         # Query the integer value at `key`
 736         private fun get_int(key: Int): Int `{
 737                 GLint val;
 738                 glGetIntegerv(key, &val);
 739                 return val;
 740         `}
 741
 742         # Does this driver support shader compilation?
 743         #
 744         # Should always return `true` in OpenGL ES 2.0 and 3.0.
 745         fun shader_compiler: Bool do return get_bool(0x8DFA)
 746
 747         # OpenGL server-side capabilities
 748         var capabilities = new GLCapabilities is lazy
 749 end
 750
 751 # Specify the clear values for the color buffer, default values are at 0.0
 752 fun glClearColor(red, green, blue, alpha: Float) `{
 753         glClearColor(red, green, blue, alpha);
 754 `}
 755
 756 # Specify the clear `value` for the depth buffer, default at 1.0
 757 fun glClearDepthf(value: Float) `{ glClearDepthf(value); `}
 758
 759 # Specify the clear `value` for the stencil buffer, default at 0
 760 fun glClearStencil(value: Int) `{ glClearStencil(value); `}
 761
 762 # Clear the `buffer`
 763 fun glClear(buffer: GLBuffer) `{ glClear(buffer); `}
 764
 765 # Enable and disable writing of frame buffer color components
 766 fun glColorMask(red, green, blue, alpha: Bool) `{ glColorMask(red, green, blue, alpha); `}
 767
 768 # Set the viewport
 769 fun glViewport(x, y, width, height: Int) `{ glViewport(x, y, width, height); `}
 770
 771 # Block until all GL execution is complete
 772 fun glFinish `{ glFinish(); `}
 773
 774 # Force execution of GL commands in finite time
 775 fun glFlush `{ glFlush(); `}
 776
 777 # Set texture parameters
 778 fun glTexParameteri(target: GLTextureTarget, pname: GLTexParameteriName, param: GLTexParameteri) `{
 779         glTexParameteri(target, pname, param);
 780 `}
 781
 782 # Name of parameters of textures
 783 extern class GLTexParameteriName
 784         super GLEnum
 785 end
 786
 787 fun gl_TEXTURE_MIN_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MIN_FILTER; `}
 788 fun gl_TEXTURE_MAG_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MAG_FILTER; `}
 789 fun gl_TEXTURE_WRAP_S: GLTexParameteriName `{ return GL_TEXTURE_WRAP_S; `}
 790 fun gl_TEXTURE_WRAP_T: GLTexParameteriName `{ return GL_TEXTURE_WRAP_T; `}
 791
 792 # Bind `framebuffer` to a framebuffer target
 793 #
 794 # In OpenGL ES 2.0, `target` must be `gl_FRAMEBUFFER`.
 795 fun glBindFramebuffer(target: GLFramebufferTarget, framebuffer: Int) `{
 796         glBindFramebuffer(target, framebuffer);
 797 `}
 798
 799 # Target of `glBindFramebuffer`
 800 extern class GLFramebufferTarget
 801         super GLEnum
 802 end
 803
 804 # Target both reading and writing on the framebuffer with `glBindFramebuffer`
 805 fun gl_FRAMEBUFFER: GLFramebufferTarget `{ return GL_FRAMEBUFFER; `}
 806
 807 # Bind `renderbuffer` to a renderbuffer target
 808 #
 809 # In OpenGL ES 2.0, `target` must be `gl_RENDERBUFFER`.
 810 fun glBindRenderbuffer(target: GLRenderbufferTarget, renderbuffer: Int) `{
 811         glBindRenderbuffer(target, renderbuffer);
 812 `}
 813
 814 # Target of `glBindRenderbuffer`
 815 extern class GLRenderbufferTarget
 816         super GLEnum
 817 end
 818
 819 # Target a renderbuffer with `glBindRenderbuffer`
 820 fun gl_RENDERBUFFER: GLRenderbufferTarget `{ return GL_RENDERBUFFER; `}
 821
 822 # Specify implementation specific hints
 823 fun glHint(target: GLHintTarget, mode: GLHintMode) `{
 824         glHint(target, mode);
 825 `}
 826
 827 # Generate and fill set of mipmaps for the texture object `target`
 828 fun glGenerateMipmap(target: GLTextureTarget) `{ glGenerateMipmap(target); `}
 829
 830 # Bind the named `buffer` object
 831 fun glBindBuffer(target: GLArrayBuffer, buffer: Int) `{ glBindBuffer(target, buffer); `}
 832
 833 # Target to which bind the buffer with `glBindBuffer`
 834 extern class GLArrayBuffer
 835         super GLEnum
 836 end
 837
 838 # Array buffer target
 839 fun gl_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ARRAY_BUFFER; `}
 840
 841 # Element array buffer
 842 fun gl_ELEMENT_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ELEMENT_ARRAY_BUFFER; `}
 843
 844 # Completeness status of a framebuffer object
 845 fun glCheckFramebufferStatus(target: GLFramebufferTarget): GLFramebufferStatus `{
 846         return glCheckFramebufferStatus(target);
 847 `}
 848
 849 # Return value of `glCheckFramebufferStatus`
 850 extern class GLFramebufferStatus
 851         super GLEnum
 852
 853         redef fun to_s
 854         do
 855                 if self == gl_FRAMEBUFFER_COMPLETE then return "complete"
 856                 if self == gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT then return "incomplete attachment"
 857                 if self == gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS then return "incomplete dimension"
 858                 if self == gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT then return "incomplete missing attachment"
 859                 if self == gl_FRAMEBUFFER_UNSUPPORTED then return "unsupported"
 860                 return "unknown"
 861         end
 862 end
 863
 864 # The framebuffer is complete
 865 fun gl_FRAMEBUFFER_COMPLETE: GLFramebufferStatus `{
 866         return GL_FRAMEBUFFER_COMPLETE;
 867 `}
 868
 869 # Not all framebuffer attachment points are framebuffer attachment complete
 870 fun gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: GLFramebufferStatus `{
 871         return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
 872 `}
 873
 874 # Not all attached images have the same width and height
 875 fun gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: GLFramebufferStatus `{
 876         return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
 877 `}
 878
 879 # No images are attached to the framebuffer
 880 fun gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: GLFramebufferStatus `{
 881         return GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
 882 `}
 883
 884 # The combination of internal formats of the attached images violates an implementation-dependent set of restrictions
 885 fun gl_FRAMEBUFFER_UNSUPPORTED: GLFramebufferStatus `{
 886         return GL_FRAMEBUFFER_UNSUPPORTED;
 887 `}
 888
 889 # Hint target for `glHint`
 890 extern class GLHintTarget
 891         super GLEnum
 892 end
 893
 894 # Indicates the quality of filtering when generating mipmap images
 895 fun gl_GENERATE_MIPMAP_HINT: GLHintTarget `{ return GL_GENERATE_MIPMAP_HINT; `}
 896
 897 # Hint mode for `glHint`
 898 extern class GLHintMode
 899         super GLEnum
 900 end
 901
 902 # The most efficient option should be chosen
 903 fun gl_FASTEST: GLHintMode `{ return GL_FASTEST; `}
 904
 905 # The most correct, or highest quality, option should be chosen
 906 fun gl_NICEST: GLHintMode `{ return GL_NICEST; `}
 907
 908 # No preference
 909 fun gl_DONT_CARE: GLHintMode `{ return GL_DONT_CARE; `}
 910
 911 # Generate `n` framebuffer object names
 912 fun glGenFramebuffers(n: Int): Array[Int]
 913 do
 914         var array = new CIntArray(n)
 915         native_glGenFramebuffers(n, array.native_array)
 916         var a = array.to_a
 917         array.destroy
 918         return a
 919 end
 920
 921 private fun native_glGenFramebuffers(n: Int, textures: NativeCIntArray) `{
 922         glGenFramebuffers(n, (GLuint *)textures);
 923 `}
 924
 925 # Determine if `name` corresponds to a framebuffer object
 926 fun glIsFramebuffer(name: Int): Bool `{
 927         return glIsFramebuffer(name);
 928 `}
 929
 930 # Delete named framebuffer objects
 931 fun glDeleteFramebuffers(framebuffers: SequenceRead[Int])
 932 do
 933         var n = framebuffers.length
 934         var array = new CIntArray.from(framebuffers)
 935         native_glDeleteFramebuffers(n, array.native_array)
 936         array.destroy
 937 end
 938
 939 private fun native_glDeleteFramebuffers(n: Int, framebuffers: NativeCIntArray) `{
 940         return glDeleteFramebuffers(n, (const GLuint *)framebuffers);
 941 `}
 942
 943 # Attach a level of a texture object as a logical buffer to the currently bound framebuffer object
 944 fun glFramebufferTexture2D(target: GLFramebufferTarget, attachment: GLAttachment,
 945                            texture_target: GLTextureTarget,  texture, level: Int) `{
 946         glFramebufferTexture2D(target, attachment, texture_target, texture, level);
 947 `}
 948
 949 # Entry point to OpenGL server-side capabilities
 950 class GLCapabilities
 951
 952         # GL capability: blend the computed fragment color values
 953         #
 954         # Foreign: GL_BLEND
 955         var blend: GLCap is lazy do return new GLCap(0x0BE2)
 956
 957         # GL capability: cull polygons based of their winding in window coordinates
 958         #
 959         # Foreign: GL_CULL_FACE
 960         var cull_face: GLCap is lazy do return new GLCap(0x0B44)
 961
 962         # GL capability: do depth comparisons and update the depth buffer
 963         #
 964         # Foreign: GL_DEPTH_TEST
 965         var depth_test: GLCap is lazy do return new GLCap(0x0B71)
 966
 967         # GL capability: dither color components or indices before they are written to the color buffer
 968         #
 969         # Foreign: GL_DITHER
 970         var dither: GLCap is lazy do return new GLCap(0x0BE2)
 971
 972         # GL capability: add an offset to depth values of a polygon fragment before depth test
 973         #
 974         # Foreign: GL_POLYGON_OFFSET_FILL
 975         var polygon_offset_fill: GLCap is lazy do return new GLCap(0x8037)
 976
 977         # GL capability: compute a temporary coverage value where each bit is determined by the alpha value at the corresponding location
 978         #
 979         # Foreign: GL_SAMPLE_ALPHA_TO_COVERAGE
 980         var sample_alpha_to_coverage: GLCap is lazy do return new GLCap(0x809E)
 981
 982         # GL capability: AND the fragment coverage with the temporary coverage value
 983         #
 984         # Foreign: GL_SAMPLE_COVERAGE
 985         var sample_coverage: GLCap is lazy do return new GLCap(0x80A0)
 986
 987         # GL capability: discard fragments that are outside the scissor rectangle
 988         #
 989         # Foreign: GL_SCISSOR_TEST
 990         var scissor_test: GLCap is lazy do return new GLCap(0x0C11)
 991
 992         # GL capability: do stencil testing and update the stencil buffer
 993         #
 994         # Foreign: GL_STENCIL_TEST
 995         var stencil_test: GLCap is lazy do return new GLCap(0x0B90)
 996 end
 997
 998 # Float related data types of OpenGL ES 2.0 shaders
 999 #
1000 # Only data types supported by shader attributes, as seen with
1001 # `GLProgram::active_attrib_type`.
1002 extern class GLFloatDataType
1003         super GLEnum
1004
1005         fun is_float: Bool `{ return self == GL_FLOAT; `}
1006         fun is_float_vec2: Bool `{ return self == GL_FLOAT_VEC2; `}
1007         fun is_float_vec3: Bool `{ return self == GL_FLOAT_VEC3; `}
1008         fun is_float_vec4: Bool `{ return self == GL_FLOAT_VEC4; `}
1009         fun is_float_mat2: Bool `{ return self == GL_FLOAT_MAT2; `}
1010         fun is_float_mat3: Bool `{ return self == GL_FLOAT_MAT3; `}
1011         fun is_float_mat4: Bool `{ return self == GL_FLOAT_MAT4; `}
1012
1013         # Instances of `GLFloatDataType` can be equal to instances of `GLDataType`
1014         redef fun ==(o)
1015         do
1016                 return o != null and o isa GLFloatDataType and o.hash == self.hash
1017         end
1018 end
1019
1020 # All data types of OpenGL ES 2.0 shaders
1021 #
1022 # These types can be used by shader uniforms, as seen with
1023 # `GLProgram::active_uniform_type`.
1024 extern class GLDataType
1025         super GLFloatDataType
1026
1027         fun is_int: Bool `{ return self == GL_INT; `}
1028         fun is_int_vec2: Bool `{ return self == GL_INT_VEC2; `}
1029         fun is_int_vec3: Bool `{ return self == GL_INT_VEC3; `}
1030         fun is_int_vec4: Bool `{ return self == GL_INT_VEC4; `}
1031         fun is_bool: Bool `{ return self == GL_BOOL; `}
1032         fun is_bool_vec2: Bool `{ return self == GL_BOOL_VEC2; `}
1033         fun is_bool_vec3: Bool `{ return self == GL_BOOL_VEC3; `}
1034         fun is_bool_vec4: Bool `{ return self == GL_BOOL_VEC4; `}
1035         fun is_sampler_2d: Bool `{ return self == GL_SAMPLER_2D; `}
1036         fun is_sampler_cube: Bool `{ return self == GL_SAMPLER_CUBE; `}
1037 end
1038
1039 # Kind of primitives to render
1040 extern class GLDrawMode
1041         super GLEnum
1042 end
1043
1044 fun gl_POINTS: GLDrawMode `{ return GL_POINTS; `}
1045 fun gl_LINES: GLDrawMode `{ return GL_LINES; `}
1046 fun gl_LINE_LOOP: GLDrawMode `{ return GL_LINE_LOOP; `}
1047 fun gl_LINE_STRIP: GLDrawMode `{ return GL_LINE_STRIP; `}
1048 fun gl_TRIANGLES: GLDrawMode `{ return GL_TRIANGLES; `}
1049 fun gl_TRIANGLE_STRIP: GLDrawMode `{ return GL_TRIANGLE_STRIP; `}
1050 fun gl_TRIANGLE_FAN: GLDrawMode `{ return GL_TRIANGLE_FAN; `}
1051
1052 # Pixel arithmetic for blending operations
1053 extern class GLBlendFactor
1054         super GLEnum
1055 end
1056
1057 fun gl_ZERO: GLBlendFactor `{ return GL_ZERO; `}
1058 fun gl_ONE: GLBlendFactor `{ return GL_ONE; `}
1059 fun gl_SRC_COLOR: GLBlendFactor `{ return GL_SRC_COLOR; `}
1060 fun gl_ONE_MINUS_SRC_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_SRC_COLOR; `}
1061 fun gl_SRC_ALPHA: GLBlendFactor `{ return GL_SRC_ALPHA; `}
1062 fun gl_ONE_MINUS_SRC_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_SRC_ALPHA; `}
1063 fun gl_DST_ALPHA: GLBlendFactor `{ return GL_DST_ALPHA; `}
1064 fun gl_ONE_MINUS_DST_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_DST_ALPHA; `}
1065 fun gl_DST_COLOR: GLBlendFactor `{ return GL_DST_COLOR; `}
1066 fun gl_ONE_MINUS_DST_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_DST_COLOR; `}
1067 fun gl_SRC_ALPHA_SATURATE: GLBlendFactor `{ return GL_SRC_ALPHA_SATURATE; `}
1068
1069 # Condition under which a pixel will be drawn
1070 extern class GLDepthFunc
1071         super GLEnum
1072 end
1073
1074 fun gl_NEVER: GLDepthFunc `{ return GL_NEVER; `}
1075 fun gl_LESS: GLDepthFunc `{ return GL_LESS; `}
1076 fun gl_EQUAL: GLDepthFunc `{ return GL_EQUAL; `}
1077 fun gl_LEQUAL: GLDepthFunc `{ return GL_LEQUAL; `}
1078 fun gl_GREATER: GLDepthFunc `{ return GL_GREATER; `}
1079 fun gl_NOTEQUAL: GLDepthFunc `{ return GL_NOTEQUAL; `}
1080 fun gl_GEQUAL: GLDepthFunc `{ return GL_GEQUAL; `}
1081 fun gl_ALWAYS: GLDepthFunc `{ return GL_ALWAYS; `}
1082
1083 # Format of pixel data
1084 extern class GLPixelFormat
1085         super GLEnum
1086 end
1087
1088 fun gl_ALPHA: GLPixelFormat `{ return GL_ALPHA; `}
1089 fun gl_RGB: GLPixelFormat `{ return GL_RGB; `}
1090 fun gl_RGBA: GLPixelFormat `{ return GL_RGBA; `}
1091
1092 # Data type of pixel data
1093 extern class GLPixelType
1094         super GLEnum
1095 end
1096
1097 fun gl_UNSIGNED_BYTE: GLPixelType `{ return GL_UNSIGNED_BYTE; `}
1098 fun gl_UNSIGNED_SHORT_5_6_5: GLPixelType `{ return GL_UNSIGNED_SHORT_5_6_5; `}
1099 fun gl_UNSIGNED_SHORT_4_4_4_4: GLPixelType `{ return GL_UNSIGNED_SHORT_4_4_4_4; `}
1100 fun gl_UNSIGNED_SHORT_5_5_5_1: GLPixelType `{ return GL_UNSIGNED_SHORT_5_5_5_1; `}
1101
1102 # Set of buffers as a bitwise OR mask
1103 extern class GLBuffer `{ GLbitfield `}
1104         # Bitwise OR with `other`
1105         fun |(other: GLBuffer): GLBuffer `{ return self | other; `}
1106 end
1107
1108 fun gl_DEPTH_BUFFER_BIT: GLBuffer `{ return GL_DEPTH_BUFFER_BIT; `}
1109 fun gl_STENCIL_BUFFER_BIT: GLBuffer `{ return GL_STENCIL_BUFFER_BIT; `}
1110 fun gl_COLOR_BUFFER_BIT: GLBuffer `{ return GL_COLOR_BUFFER_BIT; `}
1111
1112 # Define front- and back-facing polygons, `gc_CCW` by default
1113 fun glFrontFace(mode: GLFrontFaceMode) `{ glFrontFace(mode); `}
1114
1115 # Orientation of front-facing polygons
1116 extern class GLFrontFaceMode
1117         super GLEnum
1118 end
1119
1120 fun gl_CW: GLFrontFaceMode `{ return GL_CW; `}
1121 fun gl_CCW: GLFrontFaceMode `{ return GL_CCW; `}
1122
1123 # Specify whether front- or back-facing polygons can be culled, default is `back` only
1124 fun glCullFace(mode: GLCullFaceMode) `{ glCullFace(mode); `}
1125
1126 # Candidates for culling
1127 extern class GLCullFaceMode
1128         super GLEnum
1129 end
1130
1131 fun gl_FRONT: GLCullFaceMode `{ return GL_FRONT; `}
1132 fun gl_BACK: GLCullFaceMode `{ return GL_BACK; `}
1133 fun gl_FRONT_AND_BACK: GLCullFaceMode `{ return GL_FRONT_AND_BACK; `}
1134
1135 # Specify mapping of depth values from normalized device coordinates to window coordinates
1136 #
1137 # Default at 0.0, 1.0.
1138 fun glDepthRangef(near, far: Float) `{ glDepthRangef(near, far); `}
1139
1140 # Enable or disable writing into the depth buffer
1141 fun glDepthMask(value: Bool) `{ glDepthMask(value); `}
1142
1143 # Specify the value used for depth buffer comparisons
1144 #
1145 # Default value is `gl_LESS`
1146 fun glDepthFunc(func: GLDepthFunc) `{ glDepthFunc(func); `}
1147
1148 # Set the pixel arithmetic for the blending operations
1149 #
1150 # Default values:
1151 # * `src_factor`: `gl_ONE`
1152 # * `dst_factor`: `gl_ZERO`
1153 fun glBlendFunc(src_factor, dst_factor: GLBlendFactor) `{
1154         glBlendFunc(src_factor, dst_factor);
1155 `}
1156
1157 # Set the scale and units used to calculate depth values
1158 fun glPolygonOffset(factor, units: Float) `{ glPolygonOffset(factor, units); `}
1159
1160 # Specify the width of rasterized lines
1161 fun glLineWidth(width: Float) `{ glLineWidth(width); `}