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         # Is this program linked?
  76         fun is_linked: Bool do return glGetProgramiv(self, gl_LINK_STATUS) != 0
  77
  78         # Has this program been deleted?
  79         fun is_deleted: Bool do return glGetProgramiv(self, gl_DELETE_STATUS) != 0
  80
  81         # Boolean result of `validate`, must be called after `validate`
  82         fun is_validated: Bool do return glGetProgramiv(self, gl_VALIDATE_STATUS) != 0
  83
  84         # Number of active uniform in this program
  85         #
  86         # This should be the number of uniforms declared in all shader, except
  87         # unused uniforms which may have been optimized out.
  88         fun n_active_uniforms: Int do return glGetProgramiv(self, gl_ACTIVE_UNIFORMS)
  89
  90         # Length of the longest uniform name in this program, including the null byte
  91         fun active_uniform_max_length: Int do return glGetProgramiv(self, gl_ACTIVE_UNIFORM_MAX_LENGTH)
  92
  93         # Number of active attributes in this program
  94         #
  95         # This should be the number of uniforms declared in all shader, except
  96         # unused uniforms which may have been optimized out.
  97         fun n_active_attributes: Int do return glGetProgramiv(self, gl_ACTIVE_ATTRIBUTES)
  98
  99         # Length of the longest attribute name in this program, including the null byte
 100         fun active_attribute_max_length: Int do return glGetProgramiv(self, gl_ACTIVE_ATTRIBUTE_MAX_LENGTH)
 101
 102         # Number of shaders attached to this program
 103         fun n_attached_shaders: Int do return glGetProgramiv(self, gl_ATTACHED_SHADERS)
 104
 105         # Name of the active attribute at `index`
 106         fun active_attrib_name(index: Int): String
 107         do
 108                 var max_size = active_attribute_max_length
 109                 var cname = new CString(max_size)
 110                 active_attrib_name_native(index, max_size, cname)
 111                 return cname.to_s
 112         end
 113
 114         private fun active_attrib_name_native(index, max_size: Int, name: CString) `{
 115                 // We get more values than we need, for compatibility. At least the
 116                 // NVidia driver tries to fill them even if NULL.
 117
 118                 int size;
 119                 GLenum type;
 120                 glGetActiveAttrib(self, index, max_size, NULL, &size, &type, name);
 121         `}
 122
 123         # Size of the active attribute at `index`
 124         fun active_attrib_size(index: Int): Int `{
 125                 int size;
 126                 GLenum type;
 127                 glGetActiveAttrib(self, index, 0, NULL, &size, &type, NULL);
 128                 return size;
 129         `}
 130
 131         # Type of the active attribute at `index`
 132         #
 133         # May only be float related data types (single float, vectors and matrix).
 134         fun active_attrib_type(index: Int): GLDataType `{
 135                 int size;
 136                 GLenum type;
 137                 glGetActiveAttrib(self, index, 0, NULL, &size, &type, NULL);
 138                 return type;
 139         `}
 140
 141         # Name of the active uniform at `index`
 142         fun active_uniform_name(index: Int): String
 143         do
 144                 var max_size = active_uniform_max_length
 145                 var cname = new CString(max_size)
 146                 active_uniform_name_native(index, max_size, cname)
 147                 return cname.to_s
 148         end
 149
 150         private fun active_uniform_name_native(index, max_size: Int, name: CString) `{
 151                 int size;
 152                 GLenum type;
 153                 glGetActiveUniform(self, index, max_size, NULL, &size, &type, name);
 154         `}
 155
 156         # Size of the active uniform at `index`
 157         fun active_uniform_size(index: Int): Int `{
 158                 int size;
 159                 GLenum type;
 160                 glGetActiveUniform(self, index, 0, NULL, &size, &type, NULL);
 161                 return size;
 162         `}
 163
 164         # Type of the active uniform at `index`
 165         #
 166         # May be any data type supported by OpenGL ES 2.0 shaders.
 167         fun active_uniform_type(index: Int): GLDataType `{
 168                 int size;
 169                 GLenum type = 0;
 170                 glGetActiveUniform(self, index, 0, NULL, &size, &type, NULL);
 171                 return type;
 172         `}
 173 end
 174
 175 # Create a program object
 176 fun glCreateProgram: GLProgram `{ return glCreateProgram(); `}
 177
 178 # Install the `program` as part of current rendering state
 179 fun glUseProgram(program: GLProgram) `{ glUseProgram(program); `}
 180
 181 # Link the `program` object
 182 fun glLinkProgram(program: GLProgram) `{ glLinkProgram(program); `}
 183
 184 # Validate the `program` object
 185 fun glValidateProgram(program: GLProgram) `{ glValidateProgram(program); `}
 186
 187 # Delete the `program` object
 188 fun glDeleteProgram(program: GLProgram) `{ glDeleteProgram(program); `}
 189
 190 # Determine if `name` corresponds to a program object
 191 fun glIsProgram(name: GLProgram): Bool `{ return glIsProgram(name); `}
 192
 193 # Attach a `shader` to `program`
 194 fun glAttachShader(program: GLProgram, shader: GLShader) `{ glAttachShader(program, shader); `}
 195
 196 # Detach `shader` from `program`
 197 fun glDetachShader(program: GLProgram, shader: GLShader) `{ glDetachShader(program, shader); `}
 198
 199 # Parameter value from a `program` object
 200 fun glGetProgramiv(program: GLProgram, pname: GLGetParameterName): Int `{
 201         int value;
 202         glGetProgramiv(program, pname, &value);
 203         return value;
 204 `}
 205
 206 # The information log for the `program` object
 207 fun glGetProgramInfoLog(program: GLProgram): String
 208 do
 209         var size = glGetProgramiv(program, gl_INFO_LOG_LENGTH)
 210         var buf = new CString(size)
 211         native_glGetProgramInfoLog(program, size, buf)
 212         return buf.to_s_with_length(size)
 213 end
 214
 215 # Return the program information log in `buf`
 216 private fun native_glGetProgramInfoLog(program: GLProgram, buf_size: Int, buf: CString): Int `{
 217         int length;
 218         glGetProgramInfoLog(program, buf_size, &length, buf);
 219         return length;
 220 `}
 221
 222 # Abstract OpenGL ES shader object, implemented by `GLFragmentShader` and `GLVertexShader`
 223 extern class GLShader `{GLuint`}
 224
 225         # Source of the shader, if available
 226         #
 227         # Returns `null` if the source is not available, usually when the shader
 228         # was created from a binary file.
 229         fun source: nullable String
 230         do
 231                 var size = glGetShaderiv(self, gl_SHADER_SOURCE_LENGTH)
 232                 if size == 0 then return null
 233                 return source_native(size).to_s
 234         end
 235
 236         private fun source_native(size: Int): CString `{
 237                 GLchar *code = malloc(size);
 238                 glGetShaderSource(self, size, NULL, code);
 239                 return code;
 240         `}
 241
 242         # Has this shader been compiled?
 243         fun is_compiled: Bool do return glGetShaderiv(self, gl_COMPILE_STATUS) != 0
 244
 245         # Has this shader been deleted?
 246         fun is_deleted: Bool do return glGetShaderiv(self, gl_DELETE_STATUS) != 0
 247 end
 248
 249 # Get a parameter value from a `shader` object
 250 fun glGetShaderiv(shader: GLShader, pname: GLGetParameterName): Int `{
 251         int val;
 252         glGetShaderiv(shader, pname, &val);
 253         return val;
 254 `}
 255
 256 # Shader parameter
 257 extern class GLGetParameterName
 258         super GLEnum
 259 end
 260
 261 fun gl_INFO_LOG_LENGTH: GLGetParameterName `{ return GL_INFO_LOG_LENGTH; `}
 262 fun gl_DELETE_STATUS: GLGetParameterName `{ return GL_DELETE_STATUS; `}
 263
 264 fun gl_SHADER_TYPE: GLGetParameterName `{ return GL_SHADER_TYPE; `}
 265 fun gl_COMPILE_STATUS: GLGetParameterName `{ return GL_COMPILE_STATUS; `}
 266 fun gl_SHADER_SOURCE_LENGTH: GLGetParameterName `{ return GL_SHADER_SOURCE_LENGTH; `}
 267
 268 fun gl_ACTIVE_ATTRIBUTES: GLGetParameterName `{ return GL_ACTIVE_ATTRIBUTES; `}
 269 fun gl_ACTIVE_ATTRIBUTE_MAX_LENGTH: GLGetParameterName `{ return GL_ACTIVE_ATTRIBUTE_MAX_LENGTH; `}
 270 fun gl_ACTIVE_UNIFORMS: GLGetParameterName `{ return GL_ACTIVE_UNIFORMS; `}
 271 fun gl_ACTIVE_UNIFORM_MAX_LENGTH: GLGetParameterName `{ return GL_ACTIVE_UNIFORM_MAX_LENGTH; `}
 272 fun gl_ATTACHED_SHADERS: GLGetParameterName `{ return GL_ATTACHED_SHADERS; `}
 273 fun gl_LINK_STATUS: GLGetParameterName `{ return GL_LINK_STATUS; `}
 274 fun gl_VALIDATE_STATUS: GLGetParameterName `{ return GL_VALIDATE_STATUS; `}
 275
 276 # The information log for the `shader` object
 277 fun glGetShaderInfoLog(shader: GLShader): String
 278 do
 279         var size = glGetShaderiv(shader, gl_INFO_LOG_LENGTH)
 280         var buf = new CString(size)
 281         native_glGetShaderInfoLog(shader, size, buf)
 282         return buf.to_s_with_length(size)
 283 end
 284
 285 private fun native_glGetShaderInfoLog(shader: GLShader, buf_size: Int, buffer: CString): Int `{
 286         int length;
 287         glGetShaderInfoLog(shader, buf_size, &length, buffer);
 288         return length;
 289 `}
 290
 291 # Shader type
 292 extern class GLShaderType
 293         super GLEnum
 294 end
 295
 296 fun gl_VERTEX_SHADER: GLShaderType `{ return GL_VERTEX_SHADER; `}
 297 fun gl_FRAGMENT_SHADER: GLShaderType `{ return GL_FRAGMENT_SHADER; `}
 298
 299 # Create a shader object of the `shader_type`
 300 fun glCreateShader(shader_type: GLShaderType): GLShader `{
 301         return glCreateShader(shader_type);
 302 `}
 303
 304 # Replace the source code in the `shader` object with `code`
 305 fun glShaderSource(shader: GLShader, code: CString) `{
 306         glShaderSource(shader, 1, (GLchar const **)&code, NULL);
 307 `}
 308
 309 # Compile the `shader` object
 310 fun glCompileShader(shader: GLShader) `{ glCompileShader(shader); `}
 311
 312 # Delete the `shader` object
 313 fun glDeleteShader(shader: GLShader) `{ glDeleteShader(shader); `}
 314
 315 # Determine if `name` corresponds to a shader object
 316 fun glIsShader(name: GLShader): Bool `{ return glIsShader(name); `}
 317
 318 # An OpenGL ES 2.0 fragment shader
 319 extern class GLFragmentShader
 320         super GLShader
 321
 322         # Create a new fragment shader
 323         #
 324         # The newly created instance should be checked using `is_ok`.
 325         new `{ return glCreateShader(GL_FRAGMENT_SHADER); `}
 326 end
 327
 328 # An OpenGL ES 2.0 vertex shader
 329 extern class GLVertexShader
 330         super GLShader
 331
 332         # Create a new fragment shader
 333         #
 334         # The newly created instance should be checked using `is_ok`.
 335         new `{ return glCreateShader(GL_VERTEX_SHADER); `}
 336 end
 337
 338 # An array of `Float` associated to a program variable
 339 class VertexArray
 340         var index: Int
 341
 342         # Number of data per vertex
 343         var count: Int
 344
 345         protected var glfloat_array: NativeGLfloatArray
 346
 347         init(index, count: Int, array: Array[Float])
 348         do
 349                 self.index = index
 350                 self.count = count
 351                 self.glfloat_array = new NativeGLfloatArray(array.length)
 352                 for k in [0..array.length[ do
 353                         glfloat_array[k] = array[k]
 354                 end
 355         end
 356
 357         fun attrib_pointer do attrib_pointer_intern(index, count, glfloat_array)
 358         private fun attrib_pointer_intern(index, count: Int, array: NativeGLfloatArray) `{
 359                 glVertexAttribPointer(index, count, GL_FLOAT, GL_FALSE, 0, array);
 360         `}
 361
 362         # Enable this vertex attribute array
 363         fun enable do glEnableVertexAttribArray(index)
 364
 365         # Disable this vertex attribute array
 366         fun disable do glDisableVertexAttribArray(index)
 367 end
 368
 369 # Enable the generic vertex attribute array at `index`
 370 fun glEnableVertexAttribArray(index: Int) `{ glEnableVertexAttribArray(index); `}
 371
 372 # Disable the generic vertex attribute array at `index`
 373 fun glDisableVertexAttribArray(index: Int) `{ glDisableVertexAttribArray(index); `}
 374
 375 # Render primitives from array data
 376 fun glDrawArrays(mode: GLDrawMode, from, count: Int) `{ glDrawArrays(mode, from, count); `}
 377
 378 # Render primitives from array data by their index
 379 fun glDrawElements(mode: GLDrawMode, count: Int, typ: GLDataType, indices: Pointer) `{
 380         glDrawElements(mode, count, typ, indices);
 381 `}
 382
 383 # Define an array of generic vertex attribute data
 384 fun glVertexAttribPointer(index, size: Int, typ: GLDataType, normalized: Bool, stride: Int, array: NativeGLfloatArray) `{
 385         glVertexAttribPointer(index, size, typ, normalized, stride, array);
 386 `}
 387
 388 # Specify the value of a generic vertex attribute
 389 fun glVertexAttrib1f(index: Int, x: Float) `{ glVertexAttrib1f(index, x); `}
 390
 391 # Specify the value of a generic vertex attribute
 392 fun glVertexAttrib2f(index: Int, x, y: Float) `{ glVertexAttrib2f(index, x, y); `}
 393
 394 # Specify the value of a generic vertex attribute
 395 fun glVertexAttrib3f(index: Int, x, y, z: Float) `{ glVertexAttrib3f(index, x, y, z); `}
 396
 397 # Specify the value of a generic vertex attribute
 398 fun glVertexAttrib4f(index: Int, x, y, z, w: Float) `{ glVertexAttrib4f(index, x, y, z, w); `}
 399
 400 # Specify the value of a uniform variable for the current program object
 401 fun glUniform1i(index, x: Int) `{ glUniform1i(index, x); `}
 402
 403 # Specify the value of a uniform variable for the current program object
 404 fun glUniform2i(index, x, y: Int) `{ glUniform2i(index, x, y); `}
 405
 406 # Specify the value of a uniform variable for the current program object
 407 fun glUniform3i(index, x, y, z: Int) `{ glUniform3i(index, x, y, z); `}
 408
 409 # Specify the value of a uniform variable for the current program object
 410 fun glUniform4i(index, x, y, z, w: Int) `{ glUniform4i(index, x, y, z, w); `}
 411
 412 # Specify the value of a uniform variable for the current program object
 413 fun glUniform1f(index: Int, x: Float) `{ glUniform1f(index, x); `}
 414
 415 # Specify the value of a uniform variable for the current program object
 416 fun glUniform2f(index: Int, x, y: Float) `{ glUniform2f(index, x, y); `}
 417
 418 # Specify the value of a uniform variable for the current program object
 419 fun glUniform3f(index: Int, x, y, z: Float) `{ glUniform3f(index, x, y, z); `}
 420
 421 # Specify the value of a uniform variable for the current program object
 422 fun glUniform4f(index: Int, x, y, z, w: Float) `{ glUniform4f(index, x, y, z, w); `}
 423
 424 # Low level array of `Float`
 425 class GLfloatArray
 426         super CArray[Float]
 427         redef type NATIVE: NativeGLfloatArray
 428
 429         redef init(length)
 430         do
 431                 native_array = new NativeGLfloatArray(length)
 432         end
 433
 434         # Create with the content of `array`
 435         new from(array: Array[Float])
 436         do
 437                 var arr = new GLfloatArray(array.length)
 438                 arr.fill_from array
 439                 return arr
 440         end
 441
 442         # Fill with the content of `array`
 443         fun fill_from(array: Array[Float])
 444         do
 445                 assert length >= array.length
 446                 for k in [0..array.length[ do
 447                         self[k] = array[k]
 448                 end
 449         end
 450 end
 451
 452 # An array of `GLfloat` in C (`GLfloat*`)
 453 extern class NativeGLfloatArray `{ GLfloat* `}
 454         super NativeCArray
 455         redef type E: Float
 456
 457         new(size: Int) `{ return calloc(size, sizeof(GLfloat)); `}
 458
 459         redef fun [](index) `{ return self[index]; `}
 460         redef fun []=(index, val) `{ self[index] = val; `}
 461
 462         redef fun +(offset) `{ return self + offset; `}
 463 end
 464
 465 # General type for OpenGL enumerations
 466 extern class GLEnum `{ GLenum `}
 467
 468         redef fun hash `{ return self; `}
 469
 470         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 471 end
 472
 473 # Error information
 474 fun glGetError: GLError `{ return glGetError(); `}
 475
 476 # An OpenGL ES 2.0 error code
 477 extern class GLError
 478         super GLEnum
 479
 480         redef fun to_s
 481         do
 482                 if self == gl_NO_ERROR then return "No error"
 483                 if self == gl_INVALID_ENUM then return "Invalid enum"
 484                 if self == gl_INVALID_VALUE then return "Invalid value"
 485                 if self == gl_INVALID_OPERATION then return "Invalid operation"
 486                 if self == gl_INVALID_FRAMEBUFFER_OPERATION then return "invalid framebuffer operation"
 487                 if self == gl_OUT_OF_MEMORY then return "Out of memory"
 488                 return "Unknown error"
 489         end
 490 end
 491
 492 fun gl_NO_ERROR: GLError `{ return GL_NO_ERROR; `}
 493 fun gl_INVALID_ENUM: GLError `{ return GL_INVALID_ENUM; `}
 494 fun gl_INVALID_VALUE: GLError `{ return GL_INVALID_VALUE; `}
 495 fun gl_INVALID_OPERATION: GLError `{ return GL_INVALID_OPERATION; `}
 496 fun gl_INVALID_FRAMEBUFFER_OPERATION: GLError `{ return GL_INVALID_FRAMEBUFFER_OPERATION; `}
 497 fun gl_OUT_OF_MEMORY: GLError `{ return GL_OUT_OF_MEMORY; `}
 498
 499 fun assert_no_gl_error
 500 do
 501         var error = glGetError
 502         if not error == gl_NO_ERROR then
 503                 print "GL error: {error}"
 504                 abort
 505         end
 506 end
 507
 508 # Texture unit, the number of texture units is implementation dependent
 509 extern class GLTextureUnit
 510         super GLEnum
 511 end
 512
 513 fun gl_TEXTURE0: GLTextureUnit `{ return GL_TEXTURE0; `}
 514 fun gl_TEXTURE1: GLTextureUnit `{ return GL_TEXTURE1; `}
 515 fun gl_TEXTURE2: GLTextureUnit `{ return GL_TEXTURE2; `}
 516 fun gl_TEXTURE3: GLTextureUnit `{ return GL_TEXTURE3; `}
 517 fun gl_TEXTURE4: GLTextureUnit `{ return GL_TEXTURE4; `}
 518 fun gl_TEXTURE5: GLTextureUnit `{ return GL_TEXTURE5; `}
 519 fun gl_TEXTURE6: GLTextureUnit `{ return GL_TEXTURE6; `}
 520 fun gl_TEXTURE7: GLTextureUnit `{ return GL_TEXTURE7; `}
 521 fun gl_TEXTURE8: GLTextureUnit `{ return GL_TEXTURE8; `}
 522 fun gl_TEXTURE9: GLTextureUnit `{ return GL_TEXTURE9; `}
 523 fun gl_TEXTURE10: GLTextureUnit `{ return GL_TEXTURE10; `}
 524 fun gl_TEXTURE11: GLTextureUnit `{ return GL_TEXTURE11; `}
 525 fun gl_TEXTURE12: GLTextureUnit `{ return GL_TEXTURE12; `}
 526 fun gl_TEXTURE13: GLTextureUnit `{ return GL_TEXTURE13; `}
 527 fun gl_TEXTURE14: GLTextureUnit `{ return GL_TEXTURE14; `}
 528 fun gl_TEXTURE15: GLTextureUnit `{ return GL_TEXTURE15; `}
 529 fun gl_TEXTURE16: GLTextureUnit `{ return GL_TEXTURE16; `}
 530 fun gl_TEXTURE17: GLTextureUnit `{ return GL_TEXTURE17; `}
 531 fun gl_TEXTURE18: GLTextureUnit `{ return GL_TEXTURE18; `}
 532 fun gl_TEXTURE19: GLTextureUnit `{ return GL_TEXTURE19; `}
 533 fun gl_TEXTURE20: GLTextureUnit `{ return GL_TEXTURE20; `}
 534 fun gl_TEXTURE21: GLTextureUnit `{ return GL_TEXTURE21; `}
 535 fun gl_TEXTURE22: GLTextureUnit `{ return GL_TEXTURE22; `}
 536 fun gl_TEXTURE23: GLTextureUnit `{ return GL_TEXTURE23; `}
 537 fun gl_TEXTURE24: GLTextureUnit `{ return GL_TEXTURE24; `}
 538 fun gl_TEXTURE25: GLTextureUnit `{ return GL_TEXTURE25; `}
 539 fun gl_TEXTURE26: GLTextureUnit `{ return GL_TEXTURE26; `}
 540 fun gl_TEXTURE27: GLTextureUnit `{ return GL_TEXTURE27; `}
 541 fun gl_TEXTURE28: GLTextureUnit `{ return GL_TEXTURE28; `}
 542 fun gl_TEXTURE29: GLTextureUnit `{ return GL_TEXTURE29; `}
 543 fun gl_TEXTURE30: GLTextureUnit `{ return GL_TEXTURE30; `}
 544 fun gl_TEXTURE31: GLTextureUnit `{ return GL_TEXTURE31; `}
 545
 546 # Texture unit at `offset` after `gl_TEXTURE0`
 547 fun gl_TEXTURE(offset: Int): GLTextureUnit `{ return GL_TEXTURE0 + offset; `}
 548
 549 # Generate `n` texture names
 550 fun glGenTextures(n: Int): Array[Int]
 551 do
 552         var array = new CIntArray(n)
 553         native_glGenTextures(n, array.native_array)
 554         var a = array.to_a
 555         array.destroy
 556         return a
 557 end
 558
 559 private fun native_glGenTextures(n: Int, textures: NativeCIntArray) `{
 560         glGenTextures(n, (GLuint*)textures);
 561 `}
 562
 563 # Select server-side active texture unit
 564 fun glActiveTexture(texture: GLTextureUnit) `{ glActiveTexture(texture); `}
 565
 566 # Bind the named `texture` to a `target`
 567 fun glBindTexture(target: GLTextureTarget, texture: Int) `{
 568         glBindTexture(target, texture);
 569 `}
 570
 571 # Delete named textures
 572 fun glDeleteTextures(textures: SequenceRead[Int])
 573 do
 574         var n = textures.length
 575         var array = new CIntArray.from(textures)
 576         native_glDeleteTextures(n, array.native_array)
 577         array.destroy
 578 end
 579
 580 private fun native_glDeleteTextures(n: Int, textures: NativeCIntArray) `{
 581         glDeleteTextures(n, (const GLuint *)textures);
 582 `}
 583
 584 # Does `name` corresponds to a texture?
 585 fun glIsTexture(name: Int): Bool `{ return glIsTexture(name); `}
 586
 587 # Set pixel storage modes
 588 fun glPixelStorei(parameter: GLPack, val: Int) `{ glPixelStorei(parameter, val); `}
 589
 590 # Symbolic name of the parameter to be set with `glPixelStorei`
 591 extern class GLPack
 592         super GLEnum
 593 end
 594
 595 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 596 fun gl_PACK_ALIGNEMENT: GLPack `{ return GL_PACK_ALIGNMENT; `}
 597
 598 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 599 fun gl_UNPACK_ALIGNEMENT: GLPack `{ return GL_UNPACK_ALIGNMENT; `}
 600
 601 # TODO GL_PACK_ROW_LENGTH, GL_PACK_IMAGE_HEIGHT, GL_PACK_SKIP_PIXELS, GL_PACK_SKIP_ROWS, GL_PACK_SKIP_IMAGES
 602 # GL_UNPACK_ROW_LENGTH, GL_UNPACK_IMAGE_HEIGHT, GL_UNPACK_SKIP_PIXELS, GL_UNPACK_SKIP_ROWS, GL_UNPACK_SKIP_IMAGES
 603
 604 # Specify a two-dimensional texture image
 605 fun glTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 606                  width, height, border: Int,
 607                  format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 608         glTexImage2D(target, level, internalformat, width, height, border, format, typ, data);
 609 `}
 610
 611 # Specify a two-dimensional texture subimage
 612 fun glTexSubImage2D(target: GLTextureTarget,
 613                     level, xoffset, yoffset, width, height, border: Int,
 614                     format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 615         glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, typ, data);
 616 `}
 617
 618 # Copy pixels into a 2D texture image
 619 fun glCopyTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 620                      x, y, width, height, border: Int) `{
 621         glCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
 622 `}
 623
 624 # Copy a two-dimensional texture subimage
 625 fun glCopyTexSubImage2D(target: GLTextureTarget, level, xoffset, yoffset, x, y, width, height: Int) `{
 626         glCopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
 627 `}
 628
 629 # Copy a block of pixels from the framebuffer of `fomat` and `typ` at `data`
 630 fun glReadPixels(x, y, width, height: Int, format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 631         glReadPixels(x, y, width, height, format, typ, data);
 632 `}
 633
 634 # Texture minifying and magnifying function
 635 extern class GLTexParameteri
 636         super GLEnum
 637 end
 638
 639 fun gl_NEAREST: GLTexParameteri `{ return GL_NEAREST; `}
 640 fun gl_LINEAR: GLTexParameteri `{ return GL_LINEAR; `}
 641 fun gl_NEAREST_MIPMAP_NEAREST: GLTexParameteri `{ return GL_NEAREST_MIPMAP_NEAREST; `}
 642 fun gl_LINEAR_MIPMAP_NEAREST: GLTexParameteri `{ return GL_LINEAR_MIPMAP_NEAREST; `}
 643 fun gl_NEAREST_MIPMAP_NINEAR: GLTexParameteri `{ return GL_NEAREST_MIPMAP_LINEAR; `}
 644 fun gl_LINEAR_MIPMAP_LINEAR: GLTexParameteri `{ return GL_LINEAR_MIPMAP_LINEAR; `}
 645 fun gl_CLAMP_TO_EDGE: GLTexParameteri `{ return GL_CLAMP_TO_EDGE; `}
 646 fun gl_MIRRORED_REPEAT: GLTexParameteri `{ return GL_MIRRORED_REPEAT; `}
 647 fun gl_REPEAT: GLTexParameteri `{ return GL_REPEAT; `}
 648
 649 # Target texture
 650 extern class GLTextureTarget
 651         super GLEnum
 652 end
 653
 654 # Two-dimensional texture
 655 fun gl_TEXTURE_2D: GLTextureTarget `{ return GL_TEXTURE_2D; `}
 656
 657 # Cube map texture
 658 fun gl_TEXTURE_CUBE_MAP: GLTextureTarget `{ return GL_TEXTURE_CUBE_MAP; `}
 659
 660 # TODO GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 661 # GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
 662
 663 # A server-side capability
 664 class GLCap
 665
 666         # TODO private init
 667
 668         # Internal OpenGL integer for this capability
 669         private var val: Int
 670
 671         # Enable this server-side capability
 672         fun enable do enable_native(val)
 673         private fun enable_native(cap: Int) `{ glEnable(cap); `}
 674
 675         # Disable this server-side capability
 676         fun disable do disable_native(val)
 677         private fun disable_native(cap: Int) `{ glDisable(cap); `}
 678
 679         redef fun hash do return val
 680         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 681 end
 682
 683 # Generate `n` renderbuffer object names
 684 fun glGenRenderbuffers(n: Int): Array[Int]
 685 do
 686         var array = new CIntArray(n)
 687         native_glGenRenderbuffers(n, array.native_array)
 688         var a = array.to_a
 689         array.destroy
 690         return a
 691 end
 692
 693 private fun native_glGenRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 694         glGenRenderbuffers(n, (GLuint *)renderbuffers);
 695 `}
 696
 697 # Determine if `name` corresponds to a renderbuffer object
 698 fun glIsRenderbuffer(name: Int): Bool `{
 699         return glIsRenderbuffer(name);
 700 `}
 701
 702 # Delete named renderbuffer objects
 703 fun glDeleteRenderbuffers(renderbuffers: SequenceRead[Int])
 704 do
 705         var n = renderbuffers.length
 706         var array = new CIntArray.from(renderbuffers)
 707         native_glDeleteRenderbuffers(n, array.native_array)
 708         array.destroy
 709 end
 710
 711 private fun native_glDeleteRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 712         return glDeleteRenderbuffers(n, (const GLuint *)renderbuffers);
 713 `}
 714
 715 # Attach a renderbuffer object to a framebuffer object
 716 fun glFramebufferRenderbuffer(target: GLFramebufferTarget, attachment: GLAttachment,
 717                               renderbuffertarget: GLRenderbufferTarget, renderbuffer: Int) `{
 718         glFramebufferRenderbuffer(target, attachment, renderbuffertarget, renderbuffer);
 719 `}
 720
 721 # Establish data storage, `format` and dimensions of the `target` renderbuffer object's image
 722 fun glRenderbufferStorage(target: GLRenderbufferTarget, format: GLRenderbufferFormat, width, height: Int) `{
 723         glRenderbufferStorage(GL_RENDERBUFFER, format, width, height);
 724 `}
 725
 726 # Format for a renderbuffer
 727 extern class GLRenderbufferFormat
 728         super GLEnum
 729 end
 730
 731 # 4 red, 4 green, 4 blue, 4 alpha bits format
 732 fun gl_RGBA4: GLRenderbufferFormat `{ return GL_RGBA4; `}
 733
 734 # 5 red, 6 green, 5 blue bits format
 735 fun gl_RGB565: GLRenderbufferFormat `{ return GL_RGB565; `}
 736
 737 # 5 red, 5 green, 5 blue, 1 alpha bits format
 738 fun gl_RGB_A1: GLRenderbufferFormat `{ return GL_RGB5_A1; `}
 739
 740 # 16 depth bits format
 741 fun gl_DEPTH_COMPNENT16: GLRenderbufferFormat `{ return GL_DEPTH_COMPONENT16; `}
 742
 743 # 8 stencil bits format
 744 fun gl_STENCIL_INDEX8: GLRenderbufferFormat `{ return GL_STENCIL_INDEX8; `}
 745
 746 # Renderbuffer attachment point to a framebuffer
 747 extern class GLAttachment
 748         super GLEnum
 749 end
 750
 751 # First color attachment point
 752 fun gl_COLOR_ATTACHMENT0: GLAttachment `{ return GL_COLOR_ATTACHMENT0; `}
 753
 754 # Depth attachment point
 755 fun gl_DEPTH_ATTACHMENT: GLAttachment `{ return GL_DEPTH_ATTACHMENT; `}
 756
 757 # Stencil attachment
 758 fun gl_STENCIL_ATTACHMENT: GLAttachment `{ return GL_STENCIL_ATTACHMENT; `}
 759
 760 redef class Sys
 761         private var gles = new GLES is lazy
 762 end
 763
 764 # Entry points to OpenGL ES 2.0 services
 765 fun gl: GLES do return sys.gles
 766
 767 # OpenGL ES 2.0 services
 768 class GLES
 769
 770         # Query the boolean value at `key`
 771         private fun get_bool(key: Int): Bool `{
 772                 GLboolean val;
 773                 glGetBooleanv(key, &val);
 774                 return val == GL_TRUE;
 775         `}
 776
 777         # Query the floating point value at `key`
 778         private fun get_float(key: Int): Float `{
 779                 GLfloat val;
 780                 glGetFloatv(key, &val);
 781                 return val;
 782         `}
 783
 784         # Query the integer value at `key`
 785         private fun get_int(key: Int): Int `{
 786                 GLint val;
 787                 glGetIntegerv(key, &val);
 788                 return val;
 789         `}
 790
 791         # Does this driver support shader compilation?
 792         #
 793         # Should always return `true` in OpenGL ES 2.0 and 3.0.
 794         fun shader_compiler: Bool do return get_bool(0x8DFA)
 795
 796         # OpenGL server-side capabilities
 797         var capabilities = new GLCapabilities is lazy
 798 end
 799
 800 # Specify the clear values for the color buffer, default values are at 0.0
 801 fun glClearColor(red, green, blue, alpha: Float) `{
 802         glClearColor(red, green, blue, alpha);
 803 `}
 804
 805 # Specify the clear `value` for the depth buffer, default at 1.0
 806 fun glClearDepthf(value: Float) `{ glClearDepthf(value); `}
 807
 808 # Specify the clear `value` for the stencil buffer, default at 0
 809 fun glClearStencil(value: Int) `{ glClearStencil(value); `}
 810
 811 # Clear the `buffer`
 812 fun glClear(buffer: GLBuffer) `{ glClear(buffer); `}
 813
 814 # Enable and disable writing of frame buffer color components
 815 fun glColorMask(red, green, blue, alpha: Bool) `{ glColorMask(red, green, blue, alpha); `}
 816
 817 # Set the viewport
 818 fun glViewport(x, y, width, height: Int) `{ glViewport(x, y, width, height); `}
 819
 820 # Block until all GL execution is complete
 821 fun glFinish `{ glFinish(); `}
 822
 823 # Force execution of GL commands in finite time
 824 fun glFlush `{ glFlush(); `}
 825
 826 # Set texture parameters
 827 fun glTexParameteri(target: GLTextureTarget, pname: GLTexParameteriName, param: GLTexParameteri) `{
 828         glTexParameteri(target, pname, param);
 829 `}
 830
 831 # Name of parameters of textures
 832 extern class GLTexParameteriName
 833         super GLEnum
 834 end
 835
 836 fun gl_TEXTURE_MIN_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MIN_FILTER; `}
 837 fun gl_TEXTURE_MAG_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MAG_FILTER; `}
 838 fun gl_TEXTURE_WRAP_S: GLTexParameteriName `{ return GL_TEXTURE_WRAP_S; `}
 839 fun gl_TEXTURE_WRAP_T: GLTexParameteriName `{ return GL_TEXTURE_WRAP_T; `}
 840
 841 # Bind `framebuffer` to a framebuffer target
 842 #
 843 # In OpenGL ES 2.0, `target` must be `gl_FRAMEBUFFER`.
 844 fun glBindFramebuffer(target: GLFramebufferTarget, framebuffer: Int) `{
 845         glBindFramebuffer(target, framebuffer);
 846 `}
 847
 848 # Target of `glBindFramebuffer`
 849 extern class GLFramebufferTarget
 850         super GLEnum
 851 end
 852
 853 # Target both reading and writing on the framebuffer with `glBindFramebuffer`
 854 fun gl_FRAMEBUFFER: GLFramebufferTarget `{ return GL_FRAMEBUFFER; `}
 855
 856 # Bind `renderbuffer` to a renderbuffer target
 857 #
 858 # In OpenGL ES 2.0, `target` must be `gl_RENDERBUFFER`.
 859 fun glBindRenderbuffer(target: GLRenderbufferTarget, renderbuffer: Int) `{
 860         glBindRenderbuffer(target, renderbuffer);
 861 `}
 862
 863 # Target of `glBindRenderbuffer`
 864 extern class GLRenderbufferTarget
 865         super GLEnum
 866 end
 867
 868 # Target a renderbuffer with `glBindRenderbuffer`
 869 fun gl_RENDERBUFFER: GLRenderbufferTarget `{ return GL_RENDERBUFFER; `}
 870
 871 # Specify implementation specific hints
 872 fun glHint(target: GLHintTarget, mode: GLHintMode) `{
 873         glHint(target, mode);
 874 `}
 875
 876 # Generate and fill set of mipmaps for the texture object `target`
 877 fun glGenerateMipmap(target: GLTextureTarget) `{ glGenerateMipmap(target); `}
 878
 879 # Bind the named `buffer` object
 880 fun glBindBuffer(target: GLArrayBuffer, buffer: Int) `{ glBindBuffer(target, buffer); `}
 881
 882 # Target to which bind the buffer with `glBindBuffer`
 883 extern class GLArrayBuffer
 884         super GLEnum
 885 end
 886
 887 # Array buffer target
 888 fun gl_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ARRAY_BUFFER; `}
 889
 890 # Element array buffer
 891 fun gl_ELEMENT_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ELEMENT_ARRAY_BUFFER; `}
 892
 893 # Completeness status of a framebuffer object
 894 fun glCheckFramebufferStatus(target: GLFramebufferTarget): GLFramebufferStatus `{
 895         return glCheckFramebufferStatus(target);
 896 `}
 897
 898 # Return value of `glCheckFramebufferStatus`
 899 extern class GLFramebufferStatus
 900         super GLEnum
 901
 902         redef fun to_s
 903         do
 904                 if self == gl_FRAMEBUFFER_COMPLETE then return "complete"
 905                 if self == gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT then return "incomplete attachment"
 906                 if self == gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS then return "incomplete dimension"
 907                 if self == gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT then return "incomplete missing attachment"
 908                 if self == gl_FRAMEBUFFER_UNSUPPORTED then return "unsupported"
 909                 return "unknown"
 910         end
 911 end
 912
 913 # The framebuffer is complete
 914 fun gl_FRAMEBUFFER_COMPLETE: GLFramebufferStatus `{
 915         return GL_FRAMEBUFFER_COMPLETE;
 916 `}
 917
 918 # Not all framebuffer attachment points are framebuffer attachment complete
 919 fun gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: GLFramebufferStatus `{
 920         return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
 921 `}
 922
 923 # Not all attached images have the same width and height
 924 fun gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: GLFramebufferStatus `{
 925         return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
 926 `}
 927
 928 # No images are attached to the framebuffer
 929 fun gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: GLFramebufferStatus `{
 930         return GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
 931 `}
 932
 933 # The combination of internal formats of the attached images violates an implementation-dependent set of restrictions
 934 fun gl_FRAMEBUFFER_UNSUPPORTED: GLFramebufferStatus `{
 935         return GL_FRAMEBUFFER_UNSUPPORTED;
 936 `}
 937
 938 # Hint target for `glHint`
 939 extern class GLHintTarget
 940         super GLEnum
 941 end
 942
 943 # Indicates the quality of filtering when generating mipmap images
 944 fun gl_GENERATE_MIPMAP_HINT: GLHintTarget `{ return GL_GENERATE_MIPMAP_HINT; `}
 945
 946 # Hint mode for `glHint`
 947 extern class GLHintMode
 948         super GLEnum
 949 end
 950
 951 # The most efficient option should be chosen
 952 fun gl_FASTEST: GLHintMode `{ return GL_FASTEST; `}
 953
 954 # The most correct, or highest quality, option should be chosen
 955 fun gl_NICEST: GLHintMode `{ return GL_NICEST; `}
 956
 957 # No preference
 958 fun gl_DONT_CARE: GLHintMode `{ return GL_DONT_CARE; `}
 959
 960 # Generate `n` framebuffer object names
 961 fun glGenFramebuffers(n: Int): Array[Int]
 962 do
 963         var array = new CIntArray(n)
 964         native_glGenFramebuffers(n, array.native_array)
 965         var a = array.to_a
 966         array.destroy
 967         return a
 968 end
 969
 970 private fun native_glGenFramebuffers(n: Int, textures: NativeCIntArray) `{
 971         glGenFramebuffers(n, (GLuint *)textures);
 972 `}
 973
 974 # Determine if `name` corresponds to a framebuffer object
 975 fun glIsFramebuffer(name: Int): Bool `{
 976         return glIsFramebuffer(name);
 977 `}
 978
 979 # Delete named framebuffer objects
 980 fun glDeleteFramebuffers(framebuffers: SequenceRead[Int])
 981 do
 982         var n = framebuffers.length
 983         var array = new CIntArray.from(framebuffers)
 984         native_glDeleteFramebuffers(n, array.native_array)
 985         array.destroy
 986 end
 987
 988 private fun native_glDeleteFramebuffers(n: Int, framebuffers: NativeCIntArray) `{
 989         return glDeleteFramebuffers(n, (const GLuint *)framebuffers);
 990 `}
 991
 992 # Attach a level of a texture object as a logical buffer to the currently bound framebuffer object
 993 fun glFramebufferTexture2D(target: GLFramebufferTarget, attachment: GLAttachment,
 994                            texture_target: GLTextureTarget,  texture, level: Int) `{
 995         glFramebufferTexture2D(target, attachment, texture_target, texture, level);
 996 `}
 997
 998 # Entry point to OpenGL server-side capabilities
 999 class GLCapabilities
1000
1001         # GL capability: blend the computed fragment color values
1002         #
1003         # Foreign: GL_BLEND
1004         var blend: GLCap is lazy do return new GLCap(0x0BE2)
1005
1006         # GL capability: cull polygons based of their winding in window coordinates
1007         #
1008         # Foreign: GL_CULL_FACE
1009         var cull_face: GLCap is lazy do return new GLCap(0x0B44)
1010
1011         # GL capability: do depth comparisons and update the depth buffer
1012         #
1013         # Foreign: GL_DEPTH_TEST
1014         var depth_test: GLCap is lazy do return new GLCap(0x0B71)
1015
1016         # GL capability: dither color components or indices before they are written to the color buffer
1017         #
1018         # Foreign: GL_DITHER
1019         var dither: GLCap is lazy do return new GLCap(0x0BE2)
1020
1021         # GL capability: add an offset to depth values of a polygon fragment before depth test
1022         #
1023         # Foreign: GL_POLYGON_OFFSET_FILL
1024         var polygon_offset_fill: GLCap is lazy do return new GLCap(0x8037)
1025
1026         # GL capability: compute a temporary coverage value where each bit is determined by the alpha value at the corresponding location
1027         #
1028         # Foreign: GL_SAMPLE_ALPHA_TO_COVERAGE
1029         var sample_alpha_to_coverage: GLCap is lazy do return new GLCap(0x809E)
1030
1031         # GL capability: AND the fragment coverage with the temporary coverage value
1032         #
1033         # Foreign: GL_SAMPLE_COVERAGE
1034         var sample_coverage: GLCap is lazy do return new GLCap(0x80A0)
1035
1036         # GL capability: discard fragments that are outside the scissor rectangle
1037         #
1038         # Foreign: GL_SCISSOR_TEST
1039         var scissor_test: GLCap is lazy do return new GLCap(0x0C11)
1040
1041         # GL capability: do stencil testing and update the stencil buffer
1042         #
1043         # Foreign: GL_STENCIL_TEST
1044         var stencil_test: GLCap is lazy do return new GLCap(0x0B90)
1045 end
1046
1047 # All data types of OpenGL ES 2.0 shaders
1048 #
1049 # These types can be used by shader uniforms, as seen with
1050 # `GLProgram::active_uniform_type`.
1051 extern class GLDataType
1052         super GLEnum
1053 end
1054
1055 fun gl_FLOAT: GLDataType `{ return GL_FLOAT; `}
1056 fun gl_FLOAT_VEC2: GLDataType `{ return GL_FLOAT_VEC2; `}
1057 fun gl_FLOAT_VEC3: GLDataType `{ return GL_FLOAT_VEC3; `}
1058 fun gl_FLOAT_VEC4: GLDataType `{ return GL_FLOAT_VEC4; `}
1059 fun gl_FLOAT_MAT2: GLDataType `{ return GL_FLOAT_MAT2; `}
1060 fun gl_FLOAT_MAT3: GLDataType `{ return GL_FLOAT_MAT3; `}
1061 fun gl_FLOAT_MAT4: GLDataType `{ return GL_FLOAT_MAT4; `}
1062
1063 fun gl_BYTE: GLDataType `{ return GL_BYTE; `}
1064 fun gl_UNSIGNED_BYTE: GLDataType `{ return GL_UNSIGNED_BYTE; `}
1065 fun gl_SHORT: GLDataType `{ return GL_SHORT; `}
1066 fun gl_UNSIGNED_SHORT: GLDataType `{ return GL_UNSIGNED_SHORT; `}
1067 fun gl_INT: GLDataType `{ return GL_INT; `}
1068 fun gl_UNSIGNED_INT: GLDataType `{ return GL_UNSIGNED_INT; `}
1069 fun gl_FIXED: GLDataType `{ return GL_FIXED; `}
1070 fun gl_INT_VEC2: GLDataType `{ return GL_INT_VEC2; `}
1071 fun gl_INT_VEC3: GLDataType `{ return GL_INT_VEC3; `}
1072 fun gl_INT_VEC4: GLDataType `{ return GL_INT_VEC4; `}
1073 fun gl_BOOL: GLDataType `{ return GL_BOOL; `}
1074 fun gl_BOOL_VEC2: GLDataType `{ return GL_BOOL_VEC2; `}
1075 fun gl_BOOL_VEC3: GLDataType `{ return GL_BOOL_VEC3; `}
1076 fun gl_BOOL_VEC4: GLDataType `{ return GL_BOOL_VEC4; `}
1077 fun gl_SAMPLER_2D: GLDataType `{ return GL_SAMPLER_2D; `}
1078 fun gl_SAMPLER_CUBE: GLDataType `{ return GL_SAMPLER_CUBE; `}
1079
1080 fun gl_UNSIGNED_SHORT_5_6_5: GLDataType `{ return GL_UNSIGNED_SHORT_5_6_5; `}
1081 fun gl_UNSIGNED_SHORT_4_4_4_4: GLDataType `{ return GL_UNSIGNED_SHORT_4_4_4_4; `}
1082 fun gl_UNSIGNED_SHORT_5_5_5_1: GLDataType `{ return GL_UNSIGNED_SHORT_5_5_5_1; `}
1083
1084 # Kind of primitives to render
1085 extern class GLDrawMode
1086         super GLEnum
1087 end
1088
1089 fun gl_POINTS: GLDrawMode `{ return GL_POINTS; `}
1090 fun gl_LINES: GLDrawMode `{ return GL_LINES; `}
1091 fun gl_LINE_LOOP: GLDrawMode `{ return GL_LINE_LOOP; `}
1092 fun gl_LINE_STRIP: GLDrawMode `{ return GL_LINE_STRIP; `}
1093 fun gl_TRIANGLES: GLDrawMode `{ return GL_TRIANGLES; `}
1094 fun gl_TRIANGLE_STRIP: GLDrawMode `{ return GL_TRIANGLE_STRIP; `}
1095 fun gl_TRIANGLE_FAN: GLDrawMode `{ return GL_TRIANGLE_FAN; `}
1096
1097 # Pixel arithmetic for blending operations
1098 extern class GLBlendFactor
1099         super GLEnum
1100 end
1101
1102 fun gl_ZERO: GLBlendFactor `{ return GL_ZERO; `}
1103 fun gl_ONE: GLBlendFactor `{ return GL_ONE; `}
1104 fun gl_SRC_COLOR: GLBlendFactor `{ return GL_SRC_COLOR; `}
1105 fun gl_ONE_MINUS_SRC_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_SRC_COLOR; `}
1106 fun gl_SRC_ALPHA: GLBlendFactor `{ return GL_SRC_ALPHA; `}
1107 fun gl_ONE_MINUS_SRC_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_SRC_ALPHA; `}
1108 fun gl_DST_ALPHA: GLBlendFactor `{ return GL_DST_ALPHA; `}
1109 fun gl_ONE_MINUS_DST_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_DST_ALPHA; `}
1110 fun gl_DST_COLOR: GLBlendFactor `{ return GL_DST_COLOR; `}
1111 fun gl_ONE_MINUS_DST_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_DST_COLOR; `}
1112 fun gl_SRC_ALPHA_SATURATE: GLBlendFactor `{ return GL_SRC_ALPHA_SATURATE; `}
1113
1114 # Condition under which a pixel will be drawn
1115 extern class GLDepthFunc
1116         super GLEnum
1117 end
1118
1119 fun gl_NEVER: GLDepthFunc `{ return GL_NEVER; `}
1120 fun gl_LESS: GLDepthFunc `{ return GL_LESS; `}
1121 fun gl_EQUAL: GLDepthFunc `{ return GL_EQUAL; `}
1122 fun gl_LEQUAL: GLDepthFunc `{ return GL_LEQUAL; `}
1123 fun gl_GREATER: GLDepthFunc `{ return GL_GREATER; `}
1124 fun gl_NOTEQUAL: GLDepthFunc `{ return GL_NOTEQUAL; `}
1125 fun gl_GEQUAL: GLDepthFunc `{ return GL_GEQUAL; `}
1126 fun gl_ALWAYS: GLDepthFunc `{ return GL_ALWAYS; `}
1127
1128 # Format of pixel data
1129 extern class GLPixelFormat
1130         super GLEnum
1131 end
1132
1133 fun gl_ALPHA: GLPixelFormat `{ return GL_ALPHA; `}
1134 fun gl_RGB: GLPixelFormat `{ return GL_RGB; `}
1135 fun gl_RGBA: GLPixelFormat `{ return GL_RGBA; `}
1136
1137 # Set of buffers as a bitwise OR mask
1138 extern class GLBuffer `{ GLbitfield `}
1139         # Bitwise OR with `other`
1140         fun |(other: GLBuffer): GLBuffer `{ return self | other; `}
1141 end
1142
1143 fun gl_DEPTH_BUFFER_BIT: GLBuffer `{ return GL_DEPTH_BUFFER_BIT; `}
1144 fun gl_STENCIL_BUFFER_BIT: GLBuffer `{ return GL_STENCIL_BUFFER_BIT; `}
1145 fun gl_COLOR_BUFFER_BIT: GLBuffer `{ return GL_COLOR_BUFFER_BIT; `}
1146
1147 # Define front- and back-facing polygons, `gc_CCW` by default
1148 fun glFrontFace(mode: GLFrontFaceMode) `{ glFrontFace(mode); `}
1149
1150 # Orientation of front-facing polygons
1151 extern class GLFrontFaceMode
1152         super GLEnum
1153 end
1154
1155 fun gl_CW: GLFrontFaceMode `{ return GL_CW; `}
1156 fun gl_CCW: GLFrontFaceMode `{ return GL_CCW; `}
1157
1158 # Specify whether front- or back-facing polygons can be culled, default is `back` only
1159 fun glCullFace(mode: GLCullFaceMode) `{ glCullFace(mode); `}
1160
1161 # Candidates for culling
1162 extern class GLCullFaceMode
1163         super GLEnum
1164 end
1165
1166 fun gl_FRONT: GLCullFaceMode `{ return GL_FRONT; `}
1167 fun gl_BACK: GLCullFaceMode `{ return GL_BACK; `}
1168 fun gl_FRONT_AND_BACK: GLCullFaceMode `{ return GL_FRONT_AND_BACK; `}
1169
1170 # Specify mapping of depth values from normalized device coordinates to window coordinates
1171 #
1172 # Default at 0.0, 1.0.
1173 fun glDepthRangef(near, far: Float) `{ glDepthRangef(near, far); `}
1174
1175 # Enable or disable writing into the depth buffer
1176 fun glDepthMask(value: Bool) `{ glDepthMask(value); `}
1177
1178 # Specify the value used for depth buffer comparisons
1179 #
1180 # Default value is `gl_LESS`
1181 fun glDepthFunc(func: GLDepthFunc) `{ glDepthFunc(func); `}
1182
1183 # Set the pixel arithmetic for the blending operations
1184 #
1185 # Default values:
1186 # * `src_factor`: `gl_ONE`
1187 # * `dst_factor`: `gl_ZERO`
1188 fun glBlendFunc(src_factor, dst_factor: GLBlendFactor) `{
1189         glBlendFunc(src_factor, dst_factor);
1190 `}
1191
1192 # Set the scale and units used to calculate depth values
1193 fun glPolygonOffset(factor, units: Float) `{ glPolygonOffset(factor, units); `}
1194
1195 # Specify the width of rasterized lines
1196 fun glLineWidth(width: Float) `{ glLineWidth(width); `}
1197
1198 # Get the value of the parameter `pname` at `offset`
1199 fun glGetBooleanv(pname: GLGetParameterName, offset: Int): Bool `{
1200         GLboolean v[4];
1201         glGetBooleanv(pname, v);
1202         return v[offset];
1203 `}
1204
1205 # Get the value of the parameter `pname` at `offset`
1206 fun glGetFloatv(pname: GLGetParameterName, offset: Int): Float `{
1207         GLfloat v[4];
1208         glGetFloatv(pname, v);
1209         return v[offset];
1210 `}
1211
1212 # Get the value of the parameter `pname` at `offset`
1213 fun glGetIntegerv(pname: GLGetParameterName, offset: Int): Int `{
1214         GLint v[4];
1215         glGetIntegerv(pname, v);
1216         return v[offset];
1217 `}
1218
1219 fun gl_COLOR_CLEAR_VALUE: GLGetParameterName `{ return GL_COLOR_CLEAR_VALUE; `}
1220
1221 fun gl_MAX_TEXTURE_SIZE: GLGetParameterName `{ return GL_MAX_TEXTURE_SIZE; `}
1222 fun gl_MAX_VIEWPORT_DIMS: GLGetParameterName `{ return GL_MAX_VIEWPORT_DIMS; `}
1223 fun gl_MAX_VERTEX_ATTRIBS: GLGetParameterName `{ return GL_MAX_VERTEX_ATTRIBS; `}
1224 fun gl_MAX_VERTEX_UNIFORM_VECTORS: GLGetParameterName `{ return GL_MAX_VERTEX_UNIFORM_VECTORS; `}
1225 fun gl_MAX_VARYING_VECTORS: GLGetParameterName `{ return GL_MAX_VARYING_VECTORS; `}
1226 fun gl_MAX_COMBINED_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS; `}
1227 fun gl_MAX_VERTEX_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS; `}
1228 fun gl_MAX_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_TEXTURE_IMAGE_UNITS; `}
1229 fun gl_MAX_FRAGMENT_UNIFORM_VECTORS: GLGetParameterName `{ return GL_MAX_FRAGMENT_UNIFORM_VECTORS; `}