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         no_warning "missing-doc"
  35         new_annotation glsl_vertex_shader
  36         new_annotation glsl_fragment_shader
  37         ldflags("-lGLESv2")@android
  38 end
  39
  40 import android::aware
  41 intrude import c
  42
  43 in "C Header" `{
  44         #include <GLES2/gl2.h>
  45 `}
  46
  47 # OpenGL ES program to which we attach shaders
  48 extern class GLProgram `{GLuint`}
  49         # Create a new program
  50         #
  51         # The newly created instance should be checked using `is_ok`.
  52         new `{ return glCreateProgram(); `}
  53
  54         # Set the location for the attribute by `name`
  55         fun bind_attrib_location(index: Int, name: String) import String.to_cstring `{
  56                 GLchar *c_name = String_to_cstring(name);
  57                 glBindAttribLocation(self, index, c_name);
  58         `}
  59
  60         # Get the location of the attribute by `name`
  61         #
  62         # Returns `-1` if there is no active attribute named `name`.
  63         fun attrib_location(name: String): Int import String.to_cstring `{
  64                 GLchar *c_name = String_to_cstring(name);
  65                 return glGetAttribLocation(self, c_name);
  66         `}
  67
  68         # Get the location of the uniform by `name`
  69         #
  70         # Returns `-1` if there is no active uniform named `name`.
  71         fun uniform_location(name: String): Int import String.to_cstring `{
  72                 GLchar *c_name = String_to_cstring(name);
  73                 return glGetUniformLocation(self, c_name);
  74         `}
  75
  76         # Is this program linked?
  77         fun is_linked: Bool do return glGetProgramiv(self, gl_LINK_STATUS) != 0
  78
  79         # Has this program been deleted?
  80         fun is_deleted: Bool do return glGetProgramiv(self, gl_DELETE_STATUS) != 0
  81
  82         # Boolean result of `validate`, must be called after `validate`
  83         fun is_validated: Bool do return glGetProgramiv(self, gl_VALIDATE_STATUS) != 0
  84
  85         # Number of active uniform in this program
  86         #
  87         # This should be the number of uniforms declared in all shader, except
  88         # unused uniforms which may have been optimized out.
  89         fun n_active_uniforms: Int do return glGetProgramiv(self, gl_ACTIVE_UNIFORMS)
  90
  91         # Length of the longest uniform name in this program, including the null byte
  92         fun active_uniform_max_length: Int do return glGetProgramiv(self, gl_ACTIVE_UNIFORM_MAX_LENGTH)
  93
  94         # Number of active attributes in this program
  95         #
  96         # This should be the number of uniforms declared in all shader, except
  97         # unused uniforms which may have been optimized out.
  98         fun n_active_attributes: Int do return glGetProgramiv(self, gl_ACTIVE_ATTRIBUTES)
  99
 100         # Length of the longest attribute name in this program, including the null byte
 101         fun active_attribute_max_length: Int do return glGetProgramiv(self, gl_ACTIVE_ATTRIBUTE_MAX_LENGTH)
 102
 103         # Number of shaders attached to this program
 104         fun n_attached_shaders: Int do return glGetProgramiv(self, gl_ATTACHED_SHADERS)
 105
 106         # Name of the active attribute at `index`
 107         fun active_attrib_name(index: Int): String
 108         do
 109                 var max_size = active_attribute_max_length
 110                 var cname = new CString(max_size)
 111                 active_attrib_name_native(index, max_size, cname)
 112                 return cname.to_s
 113         end
 114
 115         private fun active_attrib_name_native(index, max_size: Int, name: CString) `{
 116                 // We get more values than we need, for compatibility. At least the
 117                 // NVidia driver tries to fill them even if NULL.
 118
 119                 int size;
 120                 GLenum type;
 121                 glGetActiveAttrib(self, index, max_size, NULL, &size, &type, name);
 122         `}
 123
 124         # Size of the active attribute at `index`
 125         fun active_attrib_size(index: Int): Int `{
 126                 int size;
 127                 GLenum type;
 128                 glGetActiveAttrib(self, index, 0, NULL, &size, &type, NULL);
 129                 return size;
 130         `}
 131
 132         # Type of the active attribute at `index`
 133         #
 134         # May only be float related data types (single float, vectors and matrix).
 135         fun active_attrib_type(index: Int): GLDataType `{
 136                 int size;
 137                 GLenum type;
 138                 glGetActiveAttrib(self, index, 0, NULL, &size, &type, NULL);
 139                 return type;
 140         `}
 141
 142         # Name of the active uniform at `index`
 143         fun active_uniform_name(index: Int): String
 144         do
 145                 var max_size = active_uniform_max_length
 146                 var cname = new CString(max_size)
 147                 active_uniform_name_native(index, max_size, cname)
 148                 return cname.to_s
 149         end
 150
 151         private fun active_uniform_name_native(index, max_size: Int, name: CString) `{
 152                 int size;
 153                 GLenum type;
 154                 glGetActiveUniform(self, index, max_size, NULL, &size, &type, name);
 155         `}
 156
 157         # Size of the active uniform at `index`
 158         fun active_uniform_size(index: Int): Int `{
 159                 int size;
 160                 GLenum type;
 161                 glGetActiveUniform(self, index, 0, NULL, &size, &type, NULL);
 162                 return size;
 163         `}
 164
 165         # Type of the active uniform at `index`
 166         #
 167         # May be any data type supported by OpenGL ES 2.0 shaders.
 168         fun active_uniform_type(index: Int): GLDataType `{
 169                 int size;
 170                 GLenum type = 0;
 171                 glGetActiveUniform(self, index, 0, NULL, &size, &type, NULL);
 172                 return type;
 173         `}
 174 end
 175
 176 # Create a program object
 177 fun glCreateProgram: GLProgram `{ return glCreateProgram(); `}
 178
 179 # Install the `program` as part of current rendering state
 180 fun glUseProgram(program: GLProgram) `{ glUseProgram(program); `}
 181
 182 # Link the `program` object
 183 fun glLinkProgram(program: GLProgram) `{ glLinkProgram(program); `}
 184
 185 # Validate the `program` object
 186 fun glValidateProgram(program: GLProgram) `{ glValidateProgram(program); `}
 187
 188 # Delete the `program` object
 189 fun glDeleteProgram(program: GLProgram) `{ glDeleteProgram(program); `}
 190
 191 # Does `name` corresponds to a program object?
 192 fun glIsProgram(name: GLProgram): Bool `{ return glIsProgram(name); `}
 193
 194 # Attach a `shader` to `program`
 195 fun glAttachShader(program: GLProgram, shader: GLShader) `{ glAttachShader(program, shader); `}
 196
 197 # Detach `shader` from `program`
 198 fun glDetachShader(program: GLProgram, shader: GLShader) `{ glDetachShader(program, shader); `}
 199
 200 # Parameter value from a `program` object
 201 fun glGetProgramiv(program: GLProgram, pname: GLGetParameterName): Int `{
 202         int value;
 203         glGetProgramiv(program, pname, &value);
 204         return value;
 205 `}
 206
 207 # The information log for the `program` object
 208 fun glGetProgramInfoLog(program: GLProgram): String
 209 do
 210         var size = glGetProgramiv(program, gl_INFO_LOG_LENGTH)
 211         var buf = new CString(size)
 212         native_glGetProgramInfoLog(program, size, buf)
 213         return buf.to_s_with_length(size)
 214 end
 215
 216 # Return the program information log in `buf`
 217 private fun native_glGetProgramInfoLog(program: GLProgram, buf_size: Int, buf: CString): Int `{
 218         int length;
 219         glGetProgramInfoLog(program, buf_size, &length, buf);
 220         return length;
 221 `}
 222
 223 # Abstract OpenGL ES shader object, implemented by `GLFragmentShader` and `GLVertexShader`
 224 extern class GLShader `{GLuint`}
 225
 226         # Source of the shader, if available
 227         #
 228         # Returns `null` if the source is not available, usually when the shader
 229         # was created from a binary file.
 230         fun source: nullable String
 231         do
 232                 var size = glGetShaderiv(self, gl_SHADER_SOURCE_LENGTH)
 233                 if size == 0 then return null
 234                 return source_native(size).to_s
 235         end
 236
 237         private fun source_native(size: Int): CString `{
 238                 GLchar *code = malloc(size);
 239                 glGetShaderSource(self, size, NULL, code);
 240                 return code;
 241         `}
 242
 243         # Has this shader been compiled?
 244         fun is_compiled: Bool do return glGetShaderiv(self, gl_COMPILE_STATUS) != 0
 245
 246         # Has this shader been deleted?
 247         fun is_deleted: Bool do return glGetShaderiv(self, gl_DELETE_STATUS) != 0
 248 end
 249
 250 # Get a parameter value from a `shader` object
 251 fun glGetShaderiv(shader: GLShader, pname: GLGetParameterName): Int `{
 252         int val;
 253         glGetShaderiv(shader, pname, &val);
 254         return val;
 255 `}
 256
 257 # Shader parameter
 258 extern class GLGetParameterName
 259         super GLEnum
 260 end
 261
 262 fun gl_INFO_LOG_LENGTH: GLGetParameterName `{ return GL_INFO_LOG_LENGTH; `}
 263 fun gl_DELETE_STATUS: GLGetParameterName `{ return GL_DELETE_STATUS; `}
 264
 265 fun gl_SHADER_TYPE: GLGetParameterName `{ return GL_SHADER_TYPE; `}
 266 fun gl_COMPILE_STATUS: GLGetParameterName `{ return GL_COMPILE_STATUS; `}
 267 fun gl_SHADER_SOURCE_LENGTH: GLGetParameterName `{ return GL_SHADER_SOURCE_LENGTH; `}
 268
 269 fun gl_ACTIVE_ATTRIBUTES: GLGetParameterName `{ return GL_ACTIVE_ATTRIBUTES; `}
 270 fun gl_ACTIVE_ATTRIBUTE_MAX_LENGTH: GLGetParameterName `{ return GL_ACTIVE_ATTRIBUTE_MAX_LENGTH; `}
 271 fun gl_ACTIVE_UNIFORMS: GLGetParameterName `{ return GL_ACTIVE_UNIFORMS; `}
 272 fun gl_ACTIVE_UNIFORM_MAX_LENGTH: GLGetParameterName `{ return GL_ACTIVE_UNIFORM_MAX_LENGTH; `}
 273 fun gl_ATTACHED_SHADERS: GLGetParameterName `{ return GL_ATTACHED_SHADERS; `}
 274 fun gl_LINK_STATUS: GLGetParameterName `{ return GL_LINK_STATUS; `}
 275 fun gl_VALIDATE_STATUS: GLGetParameterName `{ return GL_VALIDATE_STATUS; `}
 276
 277 # The information log for the `shader` object
 278 fun glGetShaderInfoLog(shader: GLShader): String
 279 do
 280         var size = glGetShaderiv(shader, gl_INFO_LOG_LENGTH)
 281         var buf = new CString(size)
 282         native_glGetShaderInfoLog(shader, size, buf)
 283         return buf.to_s_with_length(size)
 284 end
 285
 286 private fun native_glGetShaderInfoLog(shader: GLShader, buf_size: Int, buffer: CString): Int `{
 287         int length;
 288         glGetShaderInfoLog(shader, buf_size, &length, buffer);
 289         return length;
 290 `}
 291
 292 # Shader type
 293 extern class GLShaderType
 294         super GLEnum
 295 end
 296
 297 fun gl_VERTEX_SHADER: GLShaderType `{ return GL_VERTEX_SHADER; `}
 298 fun gl_FRAGMENT_SHADER: GLShaderType `{ return GL_FRAGMENT_SHADER; `}
 299
 300 # Create a shader object of the `shader_type`
 301 fun glCreateShader(shader_type: GLShaderType): GLShader `{
 302         return glCreateShader(shader_type);
 303 `}
 304
 305 # Replace the source code in the `shader` object with `code`
 306 fun glShaderSource(shader: GLShader, code: CString) `{
 307         glShaderSource(shader, 1, (GLchar const **)&code, NULL);
 308 `}
 309
 310 # Compile the `shader` object
 311 fun glCompileShader(shader: GLShader) `{ glCompileShader(shader); `}
 312
 313 # Delete the `shader` object
 314 fun glDeleteShader(shader: GLShader) `{ glDeleteShader(shader); `}
 315
 316 # Does `name` corresponds to a shader object?
 317 fun glIsShader(name: GLShader): Bool `{ return glIsShader(name); `}
 318
 319 # An OpenGL ES 2.0 fragment shader
 320 extern class GLFragmentShader
 321         super GLShader
 322
 323         # Create a new fragment shader
 324         #
 325         # The newly created instance should be checked using `is_ok`.
 326         new `{ return glCreateShader(GL_FRAGMENT_SHADER); `}
 327 end
 328
 329 # An OpenGL ES 2.0 vertex shader
 330 extern class GLVertexShader
 331         super GLShader
 332
 333         # Create a new fragment shader
 334         #
 335         # The newly created instance should be checked using `is_ok`.
 336         new `{ return glCreateShader(GL_VERTEX_SHADER); `}
 337 end
 338
 339 # An array of `Float` associated to a program variable
 340 class VertexArray
 341         var index: Int
 342
 343         # Number of data per vertex
 344         var count: Int
 345
 346         protected var glfloat_array: NativeGLfloatArray
 347
 348         init(index, count: Int, array: Array[Float])
 349         do
 350                 self.index = index
 351                 self.count = count
 352                 self.glfloat_array = new NativeGLfloatArray(array.length)
 353                 for k in [0..array.length[ do
 354                         glfloat_array[k] = array[k]
 355                 end
 356         end
 357
 358         fun attrib_pointer do attrib_pointer_intern(index, count, glfloat_array)
 359         private fun attrib_pointer_intern(index, count: Int, array: NativeGLfloatArray) `{
 360                 glVertexAttribPointer(index, count, GL_FLOAT, GL_FALSE, 0, array);
 361         `}
 362
 363         # Enable this vertex attribute array
 364         fun enable do glEnableVertexAttribArray(index)
 365
 366         # Disable this vertex attribute array
 367         fun disable do glDisableVertexAttribArray(index)
 368 end
 369
 370 # Enable the generic vertex attribute array at `index`
 371 fun glEnableVertexAttribArray(index: Int) `{ glEnableVertexAttribArray(index); `}
 372
 373 # Disable the generic vertex attribute array at `index`
 374 fun glDisableVertexAttribArray(index: Int) `{ glDisableVertexAttribArray(index); `}
 375
 376 # Render primitives from array data
 377 fun glDrawArrays(mode: GLDrawMode, from, count: Int) `{ glDrawArrays(mode, from, count); `}
 378
 379 # Render primitives from array data by their index listed in `indices`
 380 fun glDrawElements(mode: GLDrawMode, count: Int, typ: GLDataType, indices: Pointer) `{
 381         glDrawElements(mode, count, typ, indices);
 382 `}
 383
 384 # Render primitives from array data, at `offset` in the element buffer
 385 fun glDrawElementsi(mode: GLDrawMode, count: Int, typ: GLDataType, offset: Int) `{
 386         glDrawElements(mode, count, typ, (const GLvoid*)offset);
 387 `}
 388
 389 # Define an array of generic vertex attribute data
 390 fun glVertexAttribPointer(index, size: Int, typ: GLDataType, normalized: Bool, stride: Int, array: NativeGLfloatArray) `{
 391         glVertexAttribPointer(index, size, typ, normalized, stride, array);
 392 `}
 393
 394 # Define an array of generic vertex attribute data, at `offset` in the array buffer
 395 fun glVertexAttribPointeri(index, size: Int, typ: GLDataType, normalized: Bool, stride: Int, offset: Int) `{
 396         glVertexAttribPointer(index, size, typ, normalized, stride, (const GLvoid*)offset);
 397 `}
 398
 399 # Specify the value of a generic vertex attribute
 400 fun glVertexAttrib1f(index: Int, x: Float) `{ glVertexAttrib1f(index, x); `}
 401
 402 # Specify the value of a generic vertex attribute
 403 fun glVertexAttrib2f(index: Int, x, y: Float) `{ glVertexAttrib2f(index, x, y); `}
 404
 405 # Specify the value of a generic vertex attribute
 406 fun glVertexAttrib3f(index: Int, x, y, z: Float) `{ glVertexAttrib3f(index, x, y, z); `}
 407
 408 # Specify the value of a generic vertex attribute
 409 fun glVertexAttrib4f(index: Int, x, y, z, w: Float) `{ glVertexAttrib4f(index, x, y, z, w); `}
 410
 411 # Specify the value of a uniform variable for the current program object
 412 fun glUniform1i(index, x: Int) `{ glUniform1i(index, x); `}
 413
 414 # Specify the value of a uniform variable for the current program object
 415 fun glUniform2i(index, x, y: Int) `{ glUniform2i(index, x, y); `}
 416
 417 # Specify the value of a uniform variable for the current program object
 418 fun glUniform3i(index, x, y, z: Int) `{ glUniform3i(index, x, y, z); `}
 419
 420 # Specify the value of a uniform variable for the current program object
 421 fun glUniform4i(index, x, y, z, w: Int) `{ glUniform4i(index, x, y, z, w); `}
 422
 423 # Specify the value of a uniform variable for the current program object
 424 fun glUniform1f(index: Int, x: Float) `{ glUniform1f(index, x); `}
 425
 426 # Specify the value of a uniform variable for the current program object
 427 fun glUniform2f(index: Int, x, y: Float) `{ glUniform2f(index, x, y); `}
 428
 429 # Specify the value of a uniform variable for the current program object
 430 fun glUniform3f(index: Int, x, y, z: Float) `{ glUniform3f(index, x, y, z); `}
 431
 432 # Specify the value of a uniform variable for the current program object
 433 fun glUniform4f(index: Int, x, y, z, w: Float) `{ glUniform4f(index, x, y, z, w); `}
 434
 435 # Low level array of `Float`
 436 class GLfloatArray
 437         super FinalizableOnce
 438
 439         var length: Int
 440
 441         var native_array = new NativeGLfloatArray(length) is lateinit
 442
 443         fun [](index: Int): Float do return native_array[index]
 444
 445         fun []=(index: Int, val: Float) do native_array[index] = val
 446
 447         var add_index = 0
 448
 449         fun reset_add do add_index = 0
 450
 451         # Require: `add_index < length`
 452         fun add(value: Float)
 453         do
 454                 var index = add_index
 455                 assert index < length
 456                 native_array[index] = value
 457                 self.add_index = index + 1
 458         end
 459
 460         # Create with the content of `array`
 461         new from(array: Array[Float])
 462         do
 463                 var arr = new GLfloatArray(array.length)
 464                 arr.fill_from array
 465                 return arr
 466         end
 467
 468         # Fill with the content of `array`
 469         #
 470         # If `dst_offset` is set, the data is copied to the index `dst_offset`,
 471         # otherwise, it is copied the beginning of `self`.
 472         #
 473         # Require: `length >= array.length + dst_offset or else 0`
 474         fun fill_from(array: Array[Float], dst_offset: nullable Int)
 475         do
 476                 dst_offset = dst_offset or else add_index
 477
 478                 assert length >= array.length + dst_offset
 479                 for k in [0..array.length[ do
 480                         self[dst_offset+k] = array[k]
 481                 end
 482         end
 483
 484         redef fun finalize_once do native_array.free
 485 end
 486
 487 # An array of `GLfloat` in C (`GLfloat*`)
 488 extern class NativeGLfloatArray `{ GLfloat* `}
 489
 490         new(size: Int) `{ return calloc(size, sizeof(GLfloat)); `}
 491
 492         fun [](index: Int): Float `{ return self[index]; `}
 493
 494         fun []=(index: Int, val: Float) `{ self[index] = val; `}
 495
 496         fun +(offset: Int): NativeGLfloatArray `{ return self + offset; `}
 497 end
 498
 499 # General type for OpenGL enumerations
 500 extern class GLEnum `{ GLenum `}
 501
 502         redef fun hash `{ return self; `}
 503
 504         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 505 end
 506
 507 # Error information
 508 fun glGetError: GLError `{ return glGetError(); `}
 509
 510 # An OpenGL ES 2.0 error code
 511 extern class GLError
 512         super GLEnum
 513
 514         redef fun to_s
 515         do
 516                 if self == gl_NO_ERROR then return "No error"
 517                 if self == gl_INVALID_ENUM then return "Invalid enum"
 518                 if self == gl_INVALID_VALUE then return "Invalid value"
 519                 if self == gl_INVALID_OPERATION then return "Invalid operation"
 520                 if self == gl_INVALID_FRAMEBUFFER_OPERATION then return "invalid framebuffer operation"
 521                 if self == gl_OUT_OF_MEMORY then return "Out of memory"
 522                 return "Unknown error"
 523         end
 524 end
 525
 526 fun gl_NO_ERROR: GLError `{ return GL_NO_ERROR; `}
 527 fun gl_INVALID_ENUM: GLError `{ return GL_INVALID_ENUM; `}
 528 fun gl_INVALID_VALUE: GLError `{ return GL_INVALID_VALUE; `}
 529 fun gl_INVALID_OPERATION: GLError `{ return GL_INVALID_OPERATION; `}
 530 fun gl_INVALID_FRAMEBUFFER_OPERATION: GLError `{ return GL_INVALID_FRAMEBUFFER_OPERATION; `}
 531 fun gl_OUT_OF_MEMORY: GLError `{ return GL_OUT_OF_MEMORY; `}
 532
 533 fun assert_no_gl_error
 534 do
 535         var error = glGetError
 536         if not error == gl_NO_ERROR then
 537                 print "GL error: {error}"
 538                 abort
 539         end
 540 end
 541
 542 # Texture unit, the number of texture units is implementation dependent
 543 extern class GLTextureUnit
 544         super GLEnum
 545 end
 546
 547 fun gl_TEXTURE0: GLTextureUnit `{ return GL_TEXTURE0; `}
 548 fun gl_TEXTURE1: GLTextureUnit `{ return GL_TEXTURE1; `}
 549 fun gl_TEXTURE2: GLTextureUnit `{ return GL_TEXTURE2; `}
 550 fun gl_TEXTURE3: GLTextureUnit `{ return GL_TEXTURE3; `}
 551 fun gl_TEXTURE4: GLTextureUnit `{ return GL_TEXTURE4; `}
 552 fun gl_TEXTURE5: GLTextureUnit `{ return GL_TEXTURE5; `}
 553 fun gl_TEXTURE6: GLTextureUnit `{ return GL_TEXTURE6; `}
 554 fun gl_TEXTURE7: GLTextureUnit `{ return GL_TEXTURE7; `}
 555 fun gl_TEXTURE8: GLTextureUnit `{ return GL_TEXTURE8; `}
 556 fun gl_TEXTURE9: GLTextureUnit `{ return GL_TEXTURE9; `}
 557 fun gl_TEXTURE10: GLTextureUnit `{ return GL_TEXTURE10; `}
 558 fun gl_TEXTURE11: GLTextureUnit `{ return GL_TEXTURE11; `}
 559 fun gl_TEXTURE12: GLTextureUnit `{ return GL_TEXTURE12; `}
 560 fun gl_TEXTURE13: GLTextureUnit `{ return GL_TEXTURE13; `}
 561 fun gl_TEXTURE14: GLTextureUnit `{ return GL_TEXTURE14; `}
 562 fun gl_TEXTURE15: GLTextureUnit `{ return GL_TEXTURE15; `}
 563 fun gl_TEXTURE16: GLTextureUnit `{ return GL_TEXTURE16; `}
 564 fun gl_TEXTURE17: GLTextureUnit `{ return GL_TEXTURE17; `}
 565 fun gl_TEXTURE18: GLTextureUnit `{ return GL_TEXTURE18; `}
 566 fun gl_TEXTURE19: GLTextureUnit `{ return GL_TEXTURE19; `}
 567 fun gl_TEXTURE20: GLTextureUnit `{ return GL_TEXTURE20; `}
 568 fun gl_TEXTURE21: GLTextureUnit `{ return GL_TEXTURE21; `}
 569 fun gl_TEXTURE22: GLTextureUnit `{ return GL_TEXTURE22; `}
 570 fun gl_TEXTURE23: GLTextureUnit `{ return GL_TEXTURE23; `}
 571 fun gl_TEXTURE24: GLTextureUnit `{ return GL_TEXTURE24; `}
 572 fun gl_TEXTURE25: GLTextureUnit `{ return GL_TEXTURE25; `}
 573 fun gl_TEXTURE26: GLTextureUnit `{ return GL_TEXTURE26; `}
 574 fun gl_TEXTURE27: GLTextureUnit `{ return GL_TEXTURE27; `}
 575 fun gl_TEXTURE28: GLTextureUnit `{ return GL_TEXTURE28; `}
 576 fun gl_TEXTURE29: GLTextureUnit `{ return GL_TEXTURE29; `}
 577 fun gl_TEXTURE30: GLTextureUnit `{ return GL_TEXTURE30; `}
 578 fun gl_TEXTURE31: GLTextureUnit `{ return GL_TEXTURE31; `}
 579
 580 # Texture unit at `offset` after `gl_TEXTURE0`
 581 fun gl_TEXTURE(offset: Int): GLTextureUnit `{ return GL_TEXTURE0 + offset; `}
 582
 583 # Generate `n` texture names
 584 fun glGenTextures(n: Int): Array[Int]
 585 do
 586         var array = new CIntArray(n)
 587         native_glGenTextures(n, array.native_array)
 588         var a = array.to_a
 589         array.destroy
 590         return a
 591 end
 592
 593 private fun native_glGenTextures(n: Int, textures: NativeCIntArray) `{
 594         glGenTextures(n, (GLuint*)textures);
 595 `}
 596
 597 # Select server-side active texture unit
 598 fun glActiveTexture(texture: GLTextureUnit) `{ glActiveTexture(texture); `}
 599
 600 # Bind the named `texture` to a `target`
 601 fun glBindTexture(target: GLTextureTarget, texture: Int) `{
 602         glBindTexture(target, texture);
 603 `}
 604
 605 # Delete named textures
 606 fun glDeleteTextures(textures: SequenceRead[Int])
 607 do
 608         var n = textures.length
 609         var array = new CIntArray.from(textures)
 610         native_glDeleteTextures(n, array.native_array)
 611         array.destroy
 612 end
 613
 614 private fun native_glDeleteTextures(n: Int, textures: NativeCIntArray) `{
 615         glDeleteTextures(n, (const GLuint *)textures);
 616 `}
 617
 618 # Does `name` corresponds to a texture?
 619 fun glIsTexture(name: Int): Bool `{ return glIsTexture(name); `}
 620
 621 # Set pixel storage modes
 622 fun glPixelStorei(parameter: GLPack, val: Int) `{ glPixelStorei(parameter, val); `}
 623
 624 # Symbolic name of the parameter to be set with `glPixelStorei`
 625 extern class GLPack
 626         super GLEnum
 627 end
 628
 629 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 630 fun gl_PACK_ALIGNEMENT: GLPack `{ return GL_PACK_ALIGNMENT; `}
 631
 632 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 633 fun gl_UNPACK_ALIGNEMENT: GLPack `{ return GL_UNPACK_ALIGNMENT; `}
 634
 635 # TODO GL_PACK_ROW_LENGTH, GL_PACK_IMAGE_HEIGHT, GL_PACK_SKIP_PIXELS, GL_PACK_SKIP_ROWS, GL_PACK_SKIP_IMAGES
 636 # GL_UNPACK_ROW_LENGTH, GL_UNPACK_IMAGE_HEIGHT, GL_UNPACK_SKIP_PIXELS, GL_UNPACK_SKIP_ROWS, GL_UNPACK_SKIP_IMAGES
 637
 638 # Specify a two-dimensional texture image
 639 fun glTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 640                  width, height, border: Int,
 641                  format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 642         glTexImage2D(target, level, internalformat, width, height, border, format, typ, data);
 643 `}
 644
 645 # Specify a two-dimensional texture subimage
 646 fun glTexSubImage2D(target: GLTextureTarget,
 647                     level, xoffset, yoffset, width, height, border: Int,
 648                     format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 649         glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, typ, data);
 650 `}
 651
 652 # Copy pixels into a 2D texture image
 653 fun glCopyTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 654                      x, y, width, height, border: Int) `{
 655         glCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
 656 `}
 657
 658 # Copy a two-dimensional texture subimage
 659 fun glCopyTexSubImage2D(target: GLTextureTarget, level, xoffset, yoffset, x, y, width, height: Int) `{
 660         glCopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
 661 `}
 662
 663 # Copy a block of pixels from the framebuffer of `fomat` and `typ` at `data`
 664 fun glReadPixels(x, y, width, height: Int, format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 665         glReadPixels(x, y, width, height, format, typ, data);
 666 `}
 667
 668 # Texture minifying and magnifying function
 669 extern class GLTexParameteri
 670         super GLEnum
 671 end
 672
 673 fun gl_NEAREST: GLTexParameteri `{ return GL_NEAREST; `}
 674 fun gl_LINEAR: GLTexParameteri `{ return GL_LINEAR; `}
 675 fun gl_NEAREST_MIPMAP_NEAREST: GLTexParameteri `{ return GL_NEAREST_MIPMAP_NEAREST; `}
 676 fun gl_LINEAR_MIPMAP_NEAREST: GLTexParameteri `{ return GL_LINEAR_MIPMAP_NEAREST; `}
 677 fun gl_NEAREST_MIPMAP_NINEAR: GLTexParameteri `{ return GL_NEAREST_MIPMAP_LINEAR; `}
 678 fun gl_LINEAR_MIPMAP_LINEAR: GLTexParameteri `{ return GL_LINEAR_MIPMAP_LINEAR; `}
 679 fun gl_CLAMP_TO_EDGE: GLTexParameteri `{ return GL_CLAMP_TO_EDGE; `}
 680 fun gl_MIRRORED_REPEAT: GLTexParameteri `{ return GL_MIRRORED_REPEAT; `}
 681 fun gl_REPEAT: GLTexParameteri `{ return GL_REPEAT; `}
 682
 683 # Target texture
 684 extern class GLTextureTarget
 685         super GLEnum
 686 end
 687
 688 # Two-dimensional texture
 689 fun gl_TEXTURE_2D: GLTextureTarget `{ return GL_TEXTURE_2D; `}
 690
 691 # Cube map texture
 692 fun gl_TEXTURE_CUBE_MAP: GLTextureTarget `{ return GL_TEXTURE_CUBE_MAP; `}
 693
 694 # TODO GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 695 # GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
 696
 697 # A server-side capability
 698 class GLCap
 699
 700         # TODO private init
 701
 702         # Internal OpenGL integer for this capability
 703         private var val: Int
 704
 705         # Enable this server-side capability
 706         fun enable do enable_native(val)
 707         private fun enable_native(cap: Int) `{ glEnable(cap); `}
 708
 709         # Disable this server-side capability
 710         fun disable do disable_native(val)
 711         private fun disable_native(cap: Int) `{ glDisable(cap); `}
 712
 713         redef fun hash do return val
 714         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 715 end
 716
 717 # Generate `n` renderbuffer object names
 718 fun glGenRenderbuffers(n: Int): Array[Int]
 719 do
 720         var array = new CIntArray(n)
 721         native_glGenRenderbuffers(n, array.native_array)
 722         var a = array.to_a
 723         array.destroy
 724         return a
 725 end
 726
 727 private fun native_glGenRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 728         glGenRenderbuffers(n, (GLuint *)renderbuffers);
 729 `}
 730
 731 # Does `name` corresponds to a renderbuffer object?
 732 fun glIsRenderbuffer(name: Int): Bool `{
 733         return glIsRenderbuffer(name);
 734 `}
 735
 736 # Delete named renderbuffer objects
 737 fun glDeleteRenderbuffers(renderbuffers: SequenceRead[Int])
 738 do
 739         var n = renderbuffers.length
 740         var array = new CIntArray.from(renderbuffers)
 741         native_glDeleteRenderbuffers(n, array.native_array)
 742         array.destroy
 743 end
 744
 745 private fun native_glDeleteRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 746         return glDeleteRenderbuffers(n, (const GLuint *)renderbuffers);
 747 `}
 748
 749 # Attach a renderbuffer object to a framebuffer object
 750 fun glFramebufferRenderbuffer(target: GLFramebufferTarget, attachment: GLAttachment,
 751                               renderbuffertarget: GLRenderbufferTarget, renderbuffer: Int) `{
 752         glFramebufferRenderbuffer(target, attachment, renderbuffertarget, renderbuffer);
 753 `}
 754
 755 # Establish data storage, `format` and dimensions of the `target` renderbuffer object's image
 756 fun glRenderbufferStorage(target: GLRenderbufferTarget, format: GLRenderbufferFormat, width, height: Int) `{
 757         glRenderbufferStorage(GL_RENDERBUFFER, format, width, height);
 758 `}
 759
 760 # Format for a renderbuffer
 761 extern class GLRenderbufferFormat
 762         super GLEnum
 763 end
 764
 765 # 4 red, 4 green, 4 blue, 4 alpha bits format
 766 fun gl_RGBA4: GLRenderbufferFormat `{ return GL_RGBA4; `}
 767
 768 # 5 red, 6 green, 5 blue bits format
 769 fun gl_RGB565: GLRenderbufferFormat `{ return GL_RGB565; `}
 770
 771 # 5 red, 5 green, 5 blue, 1 alpha bits format
 772 fun gl_RGB5_A1: GLRenderbufferFormat `{ return GL_RGB5_A1; `}
 773
 774 # 16 depth bits format
 775 fun gl_DEPTH_COMPONENT16: GLRenderbufferFormat `{ return GL_DEPTH_COMPONENT16; `}
 776
 777 # 8 stencil bits format
 778 fun gl_STENCIL_INDEX8: GLRenderbufferFormat `{ return GL_STENCIL_INDEX8; `}
 779
 780 # Renderbuffer attachment point to a framebuffer
 781 extern class GLAttachment
 782         super GLEnum
 783 end
 784
 785 # First color attachment point
 786 fun gl_COLOR_ATTACHMENT0: GLAttachment `{ return GL_COLOR_ATTACHMENT0; `}
 787
 788 # Depth attachment point
 789 fun gl_DEPTH_ATTACHMENT: GLAttachment `{ return GL_DEPTH_ATTACHMENT; `}
 790
 791 # Stencil attachment
 792 fun gl_STENCIL_ATTACHMENT: GLAttachment `{ return GL_STENCIL_ATTACHMENT; `}
 793
 794 redef class Sys
 795         private var gles = new GLES is lazy
 796 end
 797
 798 # Entry points to OpenGL ES 2.0 services
 799 fun gl: GLES do return sys.gles
 800
 801 # OpenGL ES 2.0 services
 802 class GLES
 803
 804         # Query the boolean value at `key`
 805         private fun get_bool(key: Int): Bool `{
 806                 GLboolean val;
 807                 glGetBooleanv(key, &val);
 808                 return val == GL_TRUE;
 809         `}
 810
 811         # Query the floating point value at `key`
 812         private fun get_float(key: Int): Float `{
 813                 GLfloat val;
 814                 glGetFloatv(key, &val);
 815                 return val;
 816         `}
 817
 818         # Query the integer value at `key`
 819         private fun get_int(key: Int): Int `{
 820                 GLint val;
 821                 glGetIntegerv(key, &val);
 822                 return val;
 823         `}
 824
 825         # Does this driver support shader compilation?
 826         #
 827         # Should always return `true` in OpenGL ES 2.0 and 3.0.
 828         fun shader_compiler: Bool do return get_bool(0x8DFA)
 829
 830         # OpenGL server-side capabilities
 831         var capabilities = new GLCapabilities is lazy
 832 end
 833
 834 # Specify the clear values for the color buffer, default values are at 0.0
 835 fun glClearColor(red, green, blue, alpha: Float) `{
 836         glClearColor(red, green, blue, alpha);
 837 `}
 838
 839 # Specify the clear `value` for the depth buffer, default at 1.0
 840 fun glClearDepthf(value: Float) `{ glClearDepthf(value); `}
 841
 842 # Specify the clear `value` for the stencil buffer, default at 0
 843 fun glClearStencil(value: Int) `{ glClearStencil(value); `}
 844
 845 # Clear the `buffer`
 846 fun glClear(buffer: GLBuffer) `{ glClear(buffer); `}
 847
 848 # Enable and disable writing of frame buffer color components
 849 fun glColorMask(red, green, blue, alpha: Bool) `{ glColorMask(red, green, blue, alpha); `}
 850
 851 # Set the viewport
 852 fun glViewport(x, y, width, height: Int) `{ glViewport(x, y, width, height); `}
 853
 854 # Block until all GL execution is complete
 855 fun glFinish `{ glFinish(); `}
 856
 857 # Force execution of GL commands in finite time
 858 fun glFlush `{ glFlush(); `}
 859
 860 # Set texture parameters
 861 fun glTexParameteri(target: GLTextureTarget, pname: GLTexParameteriName, param: GLTexParameteri) `{
 862         glTexParameteri(target, pname, param);
 863 `}
 864
 865 # Name of parameters of textures
 866 extern class GLTexParameteriName
 867         super GLEnum
 868 end
 869
 870 fun gl_TEXTURE_MIN_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MIN_FILTER; `}
 871 fun gl_TEXTURE_MAG_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MAG_FILTER; `}
 872 fun gl_TEXTURE_WRAP_S: GLTexParameteriName `{ return GL_TEXTURE_WRAP_S; `}
 873 fun gl_TEXTURE_WRAP_T: GLTexParameteriName `{ return GL_TEXTURE_WRAP_T; `}
 874
 875 # Bind `framebuffer` to a framebuffer target
 876 #
 877 # In OpenGL ES 2.0, `target` must be `gl_FRAMEBUFFER`.
 878 fun glBindFramebuffer(target: GLFramebufferTarget, framebuffer: Int) `{
 879         glBindFramebuffer(target, framebuffer);
 880 `}
 881
 882 # Target of `glBindFramebuffer`
 883 extern class GLFramebufferTarget
 884         super GLEnum
 885 end
 886
 887 # Target both reading and writing on the framebuffer with `glBindFramebuffer`
 888 fun gl_FRAMEBUFFER: GLFramebufferTarget `{ return GL_FRAMEBUFFER; `}
 889
 890 # Bind `renderbuffer` to a renderbuffer target
 891 #
 892 # In OpenGL ES 2.0, `target` must be `gl_RENDERBUFFER`.
 893 fun glBindRenderbuffer(target: GLRenderbufferTarget, renderbuffer: Int) `{
 894         glBindRenderbuffer(target, renderbuffer);
 895 `}
 896
 897 # Target of `glBindRenderbuffer`
 898 extern class GLRenderbufferTarget
 899         super GLEnum
 900 end
 901
 902 # Target a renderbuffer with `glBindRenderbuffer`
 903 fun gl_RENDERBUFFER: GLRenderbufferTarget `{ return GL_RENDERBUFFER; `}
 904
 905 # Specify implementation specific hints
 906 fun glHint(target: GLHintTarget, mode: GLHintMode) `{
 907         glHint(target, mode);
 908 `}
 909
 910 # Generate and fill set of mipmaps for the texture object `target`
 911 fun glGenerateMipmap(target: GLTextureTarget) `{ glGenerateMipmap(target); `}
 912
 913 # Generate `n` buffer names
 914 fun glGenBuffers(n: Int): Array[Int]
 915 do
 916         var array = new CIntArray(n)
 917         native_glGenBuffers(n, array.native_array)
 918         var a = array.to_a
 919         array.destroy
 920         return a
 921 end
 922
 923 private fun native_glGenBuffers(n: Int, buffers: NativeCIntArray) `{
 924         glGenBuffers(n, (GLuint *)buffers);
 925 `}
 926
 927 # Does `name` corresponds to a buffer object?
 928 fun glIsBuffer(name: Int): Bool `{
 929         return glIsBuffer(name);
 930 `}
 931
 932 # Delete named buffer objects
 933 fun glDeleteBuffers(buffers: SequenceRead[Int])
 934 do
 935         var n = buffers.length
 936         var array = new CIntArray.from(buffers)
 937         native_glDeleteBuffers(n, array.native_array)
 938         array.destroy
 939 end
 940
 941 private fun native_glDeleteBuffers(n: Int, buffers: NativeCIntArray) `{
 942         return glDeleteBuffers(n, (const GLuint *)buffers);
 943 `}
 944
 945 # Create and initialize a buffer object's data store
 946 fun glBufferData(target: GLArrayBuffer, size: Int, data: Pointer, usage: GLBufferUsage) `{
 947         glBufferData(target, size, data, usage);
 948 `}
 949
 950 # Update a subset of a buffer object's data store
 951 fun glBufferSubData(target: GLArrayBuffer, offset, size: Int, data: Pointer) `{
 952         glBufferSubData(target, offset, size, data);
 953 `}
 954
 955 # Expected usage of a buffer
 956 extern class GLBufferUsage
 957         super GLEnum
 958 end
 959
 960 # Data will be modified once and used a few times
 961 fun gl_STREAM_DRAW: GLBufferUsage `{ return GL_STREAM_DRAW; `}
 962
 963 # Data will be modified once and used many times
 964 fun gl_STATIC_DRAW: GLBufferUsage `{ return GL_STATIC_DRAW; `}
 965
 966 # Data will be modified repeatedly and used many times
 967 fun gl_DYNAMIC_DRAW: GLBufferUsage `{ return GL_DYNAMIC_DRAW; `}
 968
 969 # Bind the named `buffer` object
 970 fun glBindBuffer(target: GLArrayBuffer, buffer: Int) `{ glBindBuffer(target, buffer); `}
 971
 972 # Target to which bind the buffer with `glBindBuffer`
 973 extern class GLArrayBuffer
 974         super GLEnum
 975 end
 976
 977 # Array buffer target
 978 fun gl_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ARRAY_BUFFER; `}
 979
 980 # Element array buffer
 981 fun gl_ELEMENT_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ELEMENT_ARRAY_BUFFER; `}
 982
 983 # Completeness status of a framebuffer object
 984 fun glCheckFramebufferStatus(target: GLFramebufferTarget): GLFramebufferStatus `{
 985         return glCheckFramebufferStatus(target);
 986 `}
 987
 988 # Return value of `glCheckFramebufferStatus`
 989 extern class GLFramebufferStatus
 990         super GLEnum
 991
 992         redef fun to_s
 993         do
 994                 if self == gl_FRAMEBUFFER_COMPLETE then return "complete"
 995                 if self == gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT then return "incomplete attachment"
 996                 if self == gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS then return "incomplete dimension"
 997                 if self == gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT then return "incomplete missing attachment"
 998                 if self == gl_FRAMEBUFFER_UNSUPPORTED then return "unsupported"
 999                 return "unknown"
1000         end
1001 end
1002
1003 # The framebuffer is complete
1004 fun gl_FRAMEBUFFER_COMPLETE: GLFramebufferStatus `{
1005         return GL_FRAMEBUFFER_COMPLETE;
1006 `}
1007
1008 # Not all framebuffer attachment points are framebuffer attachment complete
1009 fun gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: GLFramebufferStatus `{
1010         return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
1011 `}
1012
1013 # Not all attached images have the same width and height
1014 fun gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: GLFramebufferStatus `{
1015         return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
1016 `}
1017
1018 # No images are attached to the framebuffer
1019 fun gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: GLFramebufferStatus `{
1020         return GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
1021 `}
1022
1023 # The combination of internal formats of the attached images violates an implementation-dependent set of restrictions
1024 fun gl_FRAMEBUFFER_UNSUPPORTED: GLFramebufferStatus `{
1025         return GL_FRAMEBUFFER_UNSUPPORTED;
1026 `}
1027
1028 # Hint target for `glHint`
1029 extern class GLHintTarget
1030         super GLEnum
1031 end
1032
1033 # Indicates the quality of filtering when generating mipmap images
1034 fun gl_GENERATE_MIPMAP_HINT: GLHintTarget `{ return GL_GENERATE_MIPMAP_HINT; `}
1035
1036 # Hint mode for `glHint`
1037 extern class GLHintMode
1038         super GLEnum
1039 end
1040
1041 # The most efficient option should be chosen
1042 fun gl_FASTEST: GLHintMode `{ return GL_FASTEST; `}
1043
1044 # The most correct, or highest quality, option should be chosen
1045 fun gl_NICEST: GLHintMode `{ return GL_NICEST; `}
1046
1047 # No preference
1048 fun gl_DONT_CARE: GLHintMode `{ return GL_DONT_CARE; `}
1049
1050 # Generate `n` framebuffer object names
1051 fun glGenFramebuffers(n: Int): Array[Int]
1052 do
1053         var array = new CIntArray(n)
1054         native_glGenFramebuffers(n, array.native_array)
1055         var a = array.to_a
1056         array.destroy
1057         return a
1058 end
1059
1060 private fun native_glGenFramebuffers(n: Int, framebuffers: NativeCIntArray) `{
1061         glGenFramebuffers(n, (GLuint *)framebuffers);
1062 `}
1063
1064 # Does `name` corresponds to a framebuffer object?
1065 fun glIsFramebuffer(name: Int): Bool `{
1066         return glIsFramebuffer(name);
1067 `}
1068
1069 # Delete named framebuffer objects
1070 fun glDeleteFramebuffers(framebuffers: SequenceRead[Int])
1071 do
1072         var n = framebuffers.length
1073         var array = new CIntArray.from(framebuffers)
1074         native_glDeleteFramebuffers(n, array.native_array)
1075         array.destroy
1076 end
1077
1078 private fun native_glDeleteFramebuffers(n: Int, framebuffers: NativeCIntArray) `{
1079         return glDeleteFramebuffers(n, (const GLuint *)framebuffers);
1080 `}
1081
1082 # Attach a level of a texture object as a logical buffer to the currently bound framebuffer object
1083 fun glFramebufferTexture2D(target: GLFramebufferTarget, attachment: GLAttachment,
1084                            texture_target: GLTextureTarget,  texture, level: Int) `{
1085         glFramebufferTexture2D(target, attachment, texture_target, texture, level);
1086 `}
1087
1088 # Entry point to OpenGL server-side capabilities
1089 class GLCapabilities
1090
1091         # GL capability: blend the computed fragment color values
1092         #
1093         # Foreign: GL_BLEND
1094         var blend: GLCap is lazy do return new GLCap(0x0BE2)
1095
1096         # GL capability: cull polygons based of their winding in window coordinates
1097         #
1098         # Foreign: GL_CULL_FACE
1099         var cull_face: GLCap is lazy do return new GLCap(0x0B44)
1100
1101         # GL capability: do depth comparisons and update the depth buffer
1102         #
1103         # Foreign: GL_DEPTH_TEST
1104         var depth_test: GLCap is lazy do return new GLCap(0x0B71)
1105
1106         # GL capability: dither color components or indices before they are written to the color buffer
1107         #
1108         # Foreign: GL_DITHER
1109         var dither: GLCap is lazy do return new GLCap(0x0BE2)
1110
1111         # GL capability: add an offset to depth values of a polygon fragment before depth test
1112         #
1113         # Foreign: GL_POLYGON_OFFSET_FILL
1114         var polygon_offset_fill: GLCap is lazy do return new GLCap(0x8037)
1115
1116         # GL capability: compute a temporary coverage value where each bit is determined by the alpha value at the corresponding location
1117         #
1118         # Foreign: GL_SAMPLE_ALPHA_TO_COVERAGE
1119         var sample_alpha_to_coverage: GLCap is lazy do return new GLCap(0x809E)
1120
1121         # GL capability: AND the fragment coverage with the temporary coverage value
1122         #
1123         # Foreign: GL_SAMPLE_COVERAGE
1124         var sample_coverage: GLCap is lazy do return new GLCap(0x80A0)
1125
1126         # GL capability: discard fragments that are outside the scissor rectangle
1127         #
1128         # Foreign: GL_SCISSOR_TEST
1129         var scissor_test: GLCap is lazy do return new GLCap(0x0C11)
1130
1131         # GL capability: do stencil testing and update the stencil buffer
1132         #
1133         # Foreign: GL_STENCIL_TEST
1134         var stencil_test: GLCap is lazy do return new GLCap(0x0B90)
1135 end
1136
1137 # All data types of OpenGL ES 2.0 shaders
1138 #
1139 # These types can be used by shader uniforms, as seen with
1140 # `GLProgram::active_uniform_type`.
1141 extern class GLDataType
1142         super GLEnum
1143 end
1144
1145 fun gl_FLOAT: GLDataType `{ return GL_FLOAT; `}
1146 fun gl_FLOAT_VEC2: GLDataType `{ return GL_FLOAT_VEC2; `}
1147 fun gl_FLOAT_VEC3: GLDataType `{ return GL_FLOAT_VEC3; `}
1148 fun gl_FLOAT_VEC4: GLDataType `{ return GL_FLOAT_VEC4; `}
1149 fun gl_FLOAT_MAT2: GLDataType `{ return GL_FLOAT_MAT2; `}
1150 fun gl_FLOAT_MAT3: GLDataType `{ return GL_FLOAT_MAT3; `}
1151 fun gl_FLOAT_MAT4: GLDataType `{ return GL_FLOAT_MAT4; `}
1152
1153 fun gl_BYTE: GLDataType `{ return GL_BYTE; `}
1154 fun gl_UNSIGNED_BYTE: GLDataType `{ return GL_UNSIGNED_BYTE; `}
1155 fun gl_SHORT: GLDataType `{ return GL_SHORT; `}
1156 fun gl_UNSIGNED_SHORT: GLDataType `{ return GL_UNSIGNED_SHORT; `}
1157 fun gl_INT: GLDataType `{ return GL_INT; `}
1158 fun gl_UNSIGNED_INT: GLDataType `{ return GL_UNSIGNED_INT; `}
1159 fun gl_FIXED: GLDataType `{ return GL_FIXED; `}
1160 fun gl_INT_VEC2: GLDataType `{ return GL_INT_VEC2; `}
1161 fun gl_INT_VEC3: GLDataType `{ return GL_INT_VEC3; `}
1162 fun gl_INT_VEC4: GLDataType `{ return GL_INT_VEC4; `}
1163 fun gl_BOOL: GLDataType `{ return GL_BOOL; `}
1164 fun gl_BOOL_VEC2: GLDataType `{ return GL_BOOL_VEC2; `}
1165 fun gl_BOOL_VEC3: GLDataType `{ return GL_BOOL_VEC3; `}
1166 fun gl_BOOL_VEC4: GLDataType `{ return GL_BOOL_VEC4; `}
1167 fun gl_SAMPLER_2D: GLDataType `{ return GL_SAMPLER_2D; `}
1168 fun gl_SAMPLER_CUBE: GLDataType `{ return GL_SAMPLER_CUBE; `}
1169
1170 fun gl_UNSIGNED_SHORT_5_6_5: GLDataType `{ return GL_UNSIGNED_SHORT_5_6_5; `}
1171 fun gl_UNSIGNED_SHORT_4_4_4_4: GLDataType `{ return GL_UNSIGNED_SHORT_4_4_4_4; `}
1172 fun gl_UNSIGNED_SHORT_5_5_5_1: GLDataType `{ return GL_UNSIGNED_SHORT_5_5_5_1; `}
1173
1174 # Kind of primitives to render
1175 extern class GLDrawMode
1176         super GLEnum
1177 end
1178
1179 fun gl_POINTS: GLDrawMode `{ return GL_POINTS; `}
1180 fun gl_LINES: GLDrawMode `{ return GL_LINES; `}
1181 fun gl_LINE_LOOP: GLDrawMode `{ return GL_LINE_LOOP; `}
1182 fun gl_LINE_STRIP: GLDrawMode `{ return GL_LINE_STRIP; `}
1183 fun gl_TRIANGLES: GLDrawMode `{ return GL_TRIANGLES; `}
1184 fun gl_TRIANGLE_STRIP: GLDrawMode `{ return GL_TRIANGLE_STRIP; `}
1185 fun gl_TRIANGLE_FAN: GLDrawMode `{ return GL_TRIANGLE_FAN; `}
1186
1187 # Pixel arithmetic for blending operations
1188 extern class GLBlendFactor
1189         super GLEnum
1190 end
1191
1192 fun gl_ZERO: GLBlendFactor `{ return GL_ZERO; `}
1193 fun gl_ONE: GLBlendFactor `{ return GL_ONE; `}
1194 fun gl_SRC_COLOR: GLBlendFactor `{ return GL_SRC_COLOR; `}
1195 fun gl_ONE_MINUS_SRC_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_SRC_COLOR; `}
1196 fun gl_SRC_ALPHA: GLBlendFactor `{ return GL_SRC_ALPHA; `}
1197 fun gl_ONE_MINUS_SRC_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_SRC_ALPHA; `}
1198 fun gl_DST_ALPHA: GLBlendFactor `{ return GL_DST_ALPHA; `}
1199 fun gl_ONE_MINUS_DST_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_DST_ALPHA; `}
1200 fun gl_DST_COLOR: GLBlendFactor `{ return GL_DST_COLOR; `}
1201 fun gl_ONE_MINUS_DST_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_DST_COLOR; `}
1202 fun gl_SRC_ALPHA_SATURATE: GLBlendFactor `{ return GL_SRC_ALPHA_SATURATE; `}
1203
1204 # Condition under which a pixel will be drawn
1205 extern class GLDepthFunc
1206         super GLEnum
1207 end
1208
1209 fun gl_NEVER: GLDepthFunc `{ return GL_NEVER; `}
1210 fun gl_LESS: GLDepthFunc `{ return GL_LESS; `}
1211 fun gl_EQUAL: GLDepthFunc `{ return GL_EQUAL; `}
1212 fun gl_LEQUAL: GLDepthFunc `{ return GL_LEQUAL; `}
1213 fun gl_GREATER: GLDepthFunc `{ return GL_GREATER; `}
1214 fun gl_NOTEQUAL: GLDepthFunc `{ return GL_NOTEQUAL; `}
1215 fun gl_GEQUAL: GLDepthFunc `{ return GL_GEQUAL; `}
1216 fun gl_ALWAYS: GLDepthFunc `{ return GL_ALWAYS; `}
1217
1218 # Format of pixel data
1219 extern class GLPixelFormat
1220         super GLEnum
1221 end
1222
1223 fun gl_ALPHA: GLPixelFormat `{ return GL_ALPHA; `}
1224 fun gl_RGB: GLPixelFormat `{ return GL_RGB; `}
1225 fun gl_RGBA: GLPixelFormat `{ return GL_RGBA; `}
1226 fun gl_DEPTH_COMPONENT: GLPixelFormat `{ return GL_DEPTH_COMPONENT; `}
1227
1228 # Set of buffers as a bitwise OR mask
1229 extern class GLBuffer `{ GLbitfield `}
1230         # Bitwise OR with `other`
1231         fun |(other: GLBuffer): GLBuffer `{ return self | other; `}
1232 end
1233
1234 fun gl_DEPTH_BUFFER_BIT: GLBuffer `{ return GL_DEPTH_BUFFER_BIT; `}
1235 fun gl_STENCIL_BUFFER_BIT: GLBuffer `{ return GL_STENCIL_BUFFER_BIT; `}
1236 fun gl_COLOR_BUFFER_BIT: GLBuffer `{ return GL_COLOR_BUFFER_BIT; `}
1237
1238 # Define front- and back-facing polygons, `gc_CCW` by default
1239 fun glFrontFace(mode: GLFrontFaceMode) `{ glFrontFace(mode); `}
1240
1241 # Orientation of front-facing polygons
1242 extern class GLFrontFaceMode
1243         super GLEnum
1244 end
1245
1246 fun gl_CW: GLFrontFaceMode `{ return GL_CW; `}
1247 fun gl_CCW: GLFrontFaceMode `{ return GL_CCW; `}
1248
1249 # Specify whether front- or back-facing polygons can be culled, default is `back` only
1250 fun glCullFace(mode: GLCullFaceMode) `{ glCullFace(mode); `}
1251
1252 # Candidates for culling
1253 extern class GLCullFaceMode
1254         super GLEnum
1255 end
1256
1257 fun gl_FRONT: GLCullFaceMode `{ return GL_FRONT; `}
1258 fun gl_BACK: GLCullFaceMode `{ return GL_BACK; `}
1259 fun gl_FRONT_AND_BACK: GLCullFaceMode `{ return GL_FRONT_AND_BACK; `}
1260
1261 # Specify mapping of depth values from normalized device coordinates to window coordinates
1262 #
1263 # Default at 0.0, 1.0.
1264 fun glDepthRangef(near, far: Float) `{ glDepthRangef(near, far); `}
1265
1266 # Enable or disable writing into the depth buffer
1267 fun glDepthMask(value: Bool) `{ glDepthMask(value); `}
1268
1269 # Specify the value used for depth buffer comparisons
1270 #
1271 # Default value is `gl_LESS`
1272 fun glDepthFunc(func: GLDepthFunc) `{ glDepthFunc(func); `}
1273
1274 # Set the pixel arithmetic for the blending operations
1275 #
1276 # Default values:
1277 # * `src_factor`: `gl_ONE`
1278 # * `dst_factor`: `gl_ZERO`
1279 fun glBlendFunc(src_factor, dst_factor: GLBlendFactor) `{
1280         glBlendFunc(src_factor, dst_factor);
1281 `}
1282
1283 # Set the scale and units used to calculate depth values
1284 fun glPolygonOffset(factor, units: Float) `{ glPolygonOffset(factor, units); `}
1285
1286 # Specify the width of rasterized lines
1287 fun glLineWidth(width: Float) `{ glLineWidth(width); `}
1288
1289 # Get the value of the parameter `pname` at `offset`
1290 fun glGetBooleanv(pname: GLGetParameterName, offset: Int): Bool `{
1291         GLboolean v[4];
1292         glGetBooleanv(pname, v);
1293         return v[offset];
1294 `}
1295
1296 # Get the value of the parameter `pname` at `offset`
1297 fun glGetFloatv(pname: GLGetParameterName, offset: Int): Float `{
1298         GLfloat v[4];
1299         glGetFloatv(pname, v);
1300         return v[offset];
1301 `}
1302
1303 # Get the value of the parameter `pname` at `offset`
1304 fun glGetIntegerv(pname: GLGetParameterName, offset: Int): Int `{
1305         GLint v[4];
1306         glGetIntegerv(pname, v);
1307         return v[offset];
1308 `}
1309
1310 fun gl_COLOR_CLEAR_VALUE: GLGetParameterName `{ return GL_COLOR_CLEAR_VALUE; `}
1311
1312 fun gl_MAX_TEXTURE_SIZE: GLGetParameterName `{ return GL_MAX_TEXTURE_SIZE; `}
1313 fun gl_MAX_VIEWPORT_DIMS: GLGetParameterName `{ return GL_MAX_VIEWPORT_DIMS; `}
1314 fun gl_MAX_VERTEX_ATTRIBS: GLGetParameterName `{ return GL_MAX_VERTEX_ATTRIBS; `}
1315 fun gl_MAX_VERTEX_UNIFORM_VECTORS: GLGetParameterName `{ return GL_MAX_VERTEX_UNIFORM_VECTORS; `}
1316 fun gl_MAX_VARYING_VECTORS: GLGetParameterName `{ return GL_MAX_VARYING_VECTORS; `}
1317 fun gl_MAX_COMBINED_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS; `}
1318 fun gl_MAX_VERTEX_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS; `}
1319 fun gl_MAX_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_TEXTURE_IMAGE_UNITS; `}
1320 fun gl_MAX_FRAGMENT_UNIFORM_VECTORS: GLGetParameterName `{ return GL_MAX_FRAGMENT_UNIFORM_VECTORS; `}
1321
1322 fun gl_ARRAY_BUFFER_BINDING: GLGetParameterName `{ return GL_ARRAY_BUFFER_BINDING; `}
1323 fun gl_ELEMENT_ARRAY_BUFFER_BINDING: GLGetParameterName `{ return GL_ELEMENT_ARRAY_BUFFER_BINDING; `}
1324 fun gl_TEXTURE_BINDING_2D: GLGetParameterName `{ return GL_TEXTURE_BINDING_2D; `}
1325 fun gl_TEXTURE_BINDING_CUBE_MAP: GLGetParameterName `{ return GL_TEXTURE_BINDING_CUBE_MAP; `}
1326 fun gl_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: GLGetParameterName `{ return GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING; `}
1327 fun gl_FRAMEBUFFER_BINDING: GLGetParameterName `{ return GL_FRAMEBUFFER_BINDING; `}
1328 fun gl_RENDERBUFFER_BINDING: GLGetParameterName `{ return GL_RENDERBUFFER_BINDING; `}
1329
1330 # Return a string describing the current GL configuration
1331 fun glGetString(name: GLEnum): String
1332 do
1333         var cstr = glGetString_native(name)
1334         assert not cstr.address_is_null
1335         return cstr.to_s
1336 end
1337
1338 private fun glGetString_native(name: GLEnum): CString `{ return (char*)glGetString(name); `}
1339
1340 # Company responsible for this GL implementation
1341 fun gl_VENDOR: GLEnum `{ return GL_VENDOR; `}
1342
1343 # Name of the renderer, typically specific to a particular configuration of the hardware platform
1344 fun gl_RENDERER: GLEnum `{ return GL_RENDERER; `}
1345
1346 # Version or release number
1347 fun gl_VERSION: GLEnum `{ return GL_VERSION; `}
1348
1349 # Version or release number for the shading language of the form
1350 fun gl_SHADING_LANGUAGE_VERSION: GLEnum `{ return GL_SHADING_LANGUAGE_VERSION; `}
1351
1352 # Space-separated list of supported extensions to GL
1353 fun gl_EXTENSIONS: GLEnum `{ return GL_EXTENSIONS; `}