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 CArray[Float]
 438         redef type NATIVE: NativeGLfloatArray
 439
 440         redef init(length)
 441         do
 442                 native_array = new NativeGLfloatArray(length)
 443         end
 444
 445         # Create with the content of `array`
 446         new from(array: Array[Float])
 447         do
 448                 var arr = new GLfloatArray(array.length)
 449                 arr.fill_from array
 450                 return arr
 451         end
 452
 453         # Fill with the content of `array`
 454         #
 455         # If `dst_offset` is set, the data is copied to the index `dst_offset`,
 456         # otherwise, it is copied the beginning of `self`.
 457         #
 458         # Require: `length >= array.length + dst_offset or else 0`
 459         fun fill_from(array: Array[Float], dst_offset: nullable Int)
 460         do
 461                 dst_offset = dst_offset or else 0
 462
 463                 assert length >= array.length + dst_offset
 464                 for k in [0..array.length[ do
 465                         self[dst_offset+k] = array[k]
 466                 end
 467         end
 468 end
 469
 470 # An array of `GLfloat` in C (`GLfloat*`)
 471 extern class NativeGLfloatArray `{ GLfloat* `}
 472         super NativeCArray
 473         redef type E: Float
 474
 475         new(size: Int) `{ return calloc(size, sizeof(GLfloat)); `}
 476
 477         redef fun [](index) `{ return self[index]; `}
 478         redef fun []=(index, val) `{ self[index] = val; `}
 479
 480         redef fun +(offset) `{ return self + offset; `}
 481 end
 482
 483 # General type for OpenGL enumerations
 484 extern class GLEnum `{ GLenum `}
 485
 486         redef fun hash `{ return self; `}
 487
 488         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 489 end
 490
 491 # Error information
 492 fun glGetError: GLError `{ return glGetError(); `}
 493
 494 # An OpenGL ES 2.0 error code
 495 extern class GLError
 496         super GLEnum
 497
 498         redef fun to_s
 499         do
 500                 if self == gl_NO_ERROR then return "No error"
 501                 if self == gl_INVALID_ENUM then return "Invalid enum"
 502                 if self == gl_INVALID_VALUE then return "Invalid value"
 503                 if self == gl_INVALID_OPERATION then return "Invalid operation"
 504                 if self == gl_INVALID_FRAMEBUFFER_OPERATION then return "invalid framebuffer operation"
 505                 if self == gl_OUT_OF_MEMORY then return "Out of memory"
 506                 return "Unknown error"
 507         end
 508 end
 509
 510 fun gl_NO_ERROR: GLError `{ return GL_NO_ERROR; `}
 511 fun gl_INVALID_ENUM: GLError `{ return GL_INVALID_ENUM; `}
 512 fun gl_INVALID_VALUE: GLError `{ return GL_INVALID_VALUE; `}
 513 fun gl_INVALID_OPERATION: GLError `{ return GL_INVALID_OPERATION; `}
 514 fun gl_INVALID_FRAMEBUFFER_OPERATION: GLError `{ return GL_INVALID_FRAMEBUFFER_OPERATION; `}
 515 fun gl_OUT_OF_MEMORY: GLError `{ return GL_OUT_OF_MEMORY; `}
 516
 517 fun assert_no_gl_error
 518 do
 519         var error = glGetError
 520         if not error == gl_NO_ERROR then
 521                 print "GL error: {error}"
 522                 abort
 523         end
 524 end
 525
 526 # Texture unit, the number of texture units is implementation dependent
 527 extern class GLTextureUnit
 528         super GLEnum
 529 end
 530
 531 fun gl_TEXTURE0: GLTextureUnit `{ return GL_TEXTURE0; `}
 532 fun gl_TEXTURE1: GLTextureUnit `{ return GL_TEXTURE1; `}
 533 fun gl_TEXTURE2: GLTextureUnit `{ return GL_TEXTURE2; `}
 534 fun gl_TEXTURE3: GLTextureUnit `{ return GL_TEXTURE3; `}
 535 fun gl_TEXTURE4: GLTextureUnit `{ return GL_TEXTURE4; `}
 536 fun gl_TEXTURE5: GLTextureUnit `{ return GL_TEXTURE5; `}
 537 fun gl_TEXTURE6: GLTextureUnit `{ return GL_TEXTURE6; `}
 538 fun gl_TEXTURE7: GLTextureUnit `{ return GL_TEXTURE7; `}
 539 fun gl_TEXTURE8: GLTextureUnit `{ return GL_TEXTURE8; `}
 540 fun gl_TEXTURE9: GLTextureUnit `{ return GL_TEXTURE9; `}
 541 fun gl_TEXTURE10: GLTextureUnit `{ return GL_TEXTURE10; `}
 542 fun gl_TEXTURE11: GLTextureUnit `{ return GL_TEXTURE11; `}
 543 fun gl_TEXTURE12: GLTextureUnit `{ return GL_TEXTURE12; `}
 544 fun gl_TEXTURE13: GLTextureUnit `{ return GL_TEXTURE13; `}
 545 fun gl_TEXTURE14: GLTextureUnit `{ return GL_TEXTURE14; `}
 546 fun gl_TEXTURE15: GLTextureUnit `{ return GL_TEXTURE15; `}
 547 fun gl_TEXTURE16: GLTextureUnit `{ return GL_TEXTURE16; `}
 548 fun gl_TEXTURE17: GLTextureUnit `{ return GL_TEXTURE17; `}
 549 fun gl_TEXTURE18: GLTextureUnit `{ return GL_TEXTURE18; `}
 550 fun gl_TEXTURE19: GLTextureUnit `{ return GL_TEXTURE19; `}
 551 fun gl_TEXTURE20: GLTextureUnit `{ return GL_TEXTURE20; `}
 552 fun gl_TEXTURE21: GLTextureUnit `{ return GL_TEXTURE21; `}
 553 fun gl_TEXTURE22: GLTextureUnit `{ return GL_TEXTURE22; `}
 554 fun gl_TEXTURE23: GLTextureUnit `{ return GL_TEXTURE23; `}
 555 fun gl_TEXTURE24: GLTextureUnit `{ return GL_TEXTURE24; `}
 556 fun gl_TEXTURE25: GLTextureUnit `{ return GL_TEXTURE25; `}
 557 fun gl_TEXTURE26: GLTextureUnit `{ return GL_TEXTURE26; `}
 558 fun gl_TEXTURE27: GLTextureUnit `{ return GL_TEXTURE27; `}
 559 fun gl_TEXTURE28: GLTextureUnit `{ return GL_TEXTURE28; `}
 560 fun gl_TEXTURE29: GLTextureUnit `{ return GL_TEXTURE29; `}
 561 fun gl_TEXTURE30: GLTextureUnit `{ return GL_TEXTURE30; `}
 562 fun gl_TEXTURE31: GLTextureUnit `{ return GL_TEXTURE31; `}
 563
 564 # Texture unit at `offset` after `gl_TEXTURE0`
 565 fun gl_TEXTURE(offset: Int): GLTextureUnit `{ return GL_TEXTURE0 + offset; `}
 566
 567 # Generate `n` texture names
 568 fun glGenTextures(n: Int): Array[Int]
 569 do
 570         var array = new CIntArray(n)
 571         native_glGenTextures(n, array.native_array)
 572         var a = array.to_a
 573         array.destroy
 574         return a
 575 end
 576
 577 private fun native_glGenTextures(n: Int, textures: NativeCIntArray) `{
 578         glGenTextures(n, (GLuint*)textures);
 579 `}
 580
 581 # Select server-side active texture unit
 582 fun glActiveTexture(texture: GLTextureUnit) `{ glActiveTexture(texture); `}
 583
 584 # Bind the named `texture` to a `target`
 585 fun glBindTexture(target: GLTextureTarget, texture: Int) `{
 586         glBindTexture(target, texture);
 587 `}
 588
 589 # Delete named textures
 590 fun glDeleteTextures(textures: SequenceRead[Int])
 591 do
 592         var n = textures.length
 593         var array = new CIntArray.from(textures)
 594         native_glDeleteTextures(n, array.native_array)
 595         array.destroy
 596 end
 597
 598 private fun native_glDeleteTextures(n: Int, textures: NativeCIntArray) `{
 599         glDeleteTextures(n, (const GLuint *)textures);
 600 `}
 601
 602 # Does `name` corresponds to a texture?
 603 fun glIsTexture(name: Int): Bool `{ return glIsTexture(name); `}
 604
 605 # Set pixel storage modes
 606 fun glPixelStorei(parameter: GLPack, val: Int) `{ glPixelStorei(parameter, val); `}
 607
 608 # Symbolic name of the parameter to be set with `glPixelStorei`
 609 extern class GLPack
 610         super GLEnum
 611 end
 612
 613 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 614 fun gl_PACK_ALIGNEMENT: GLPack `{ return GL_PACK_ALIGNMENT; `}
 615
 616 # Parameter to specify the alignment requirements for the start of each pixel row in memory
 617 fun gl_UNPACK_ALIGNEMENT: GLPack `{ return GL_UNPACK_ALIGNMENT; `}
 618
 619 # TODO GL_PACK_ROW_LENGTH, GL_PACK_IMAGE_HEIGHT, GL_PACK_SKIP_PIXELS, GL_PACK_SKIP_ROWS, GL_PACK_SKIP_IMAGES
 620 # GL_UNPACK_ROW_LENGTH, GL_UNPACK_IMAGE_HEIGHT, GL_UNPACK_SKIP_PIXELS, GL_UNPACK_SKIP_ROWS, GL_UNPACK_SKIP_IMAGES
 621
 622 # Specify a two-dimensional texture image
 623 fun glTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 624                  width, height, border: Int,
 625                  format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 626         glTexImage2D(target, level, internalformat, width, height, border, format, typ, data);
 627 `}
 628
 629 # Specify a two-dimensional texture subimage
 630 fun glTexSubImage2D(target: GLTextureTarget,
 631                     level, xoffset, yoffset, width, height, border: Int,
 632                     format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 633         glTexSubImage2D(target, level, xoffset, yoffset, width, height, format, typ, data);
 634 `}
 635
 636 # Copy pixels into a 2D texture image
 637 fun glCopyTexImage2D(target: GLTextureTarget, level: Int, internalformat: GLPixelFormat,
 638                      x, y, width, height, border: Int) `{
 639         glCopyTexImage2D(target, level, internalformat, x, y, width, height, border);
 640 `}
 641
 642 # Copy a two-dimensional texture subimage
 643 fun glCopyTexSubImage2D(target: GLTextureTarget, level, xoffset, yoffset, x, y, width, height: Int) `{
 644         glCopyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
 645 `}
 646
 647 # Copy a block of pixels from the framebuffer of `fomat` and `typ` at `data`
 648 fun glReadPixels(x, y, width, height: Int, format: GLPixelFormat, typ: GLDataType, data: Pointer) `{
 649         glReadPixels(x, y, width, height, format, typ, data);
 650 `}
 651
 652 # Texture minifying and magnifying function
 653 extern class GLTexParameteri
 654         super GLEnum
 655 end
 656
 657 fun gl_NEAREST: GLTexParameteri `{ return GL_NEAREST; `}
 658 fun gl_LINEAR: GLTexParameteri `{ return GL_LINEAR; `}
 659 fun gl_NEAREST_MIPMAP_NEAREST: GLTexParameteri `{ return GL_NEAREST_MIPMAP_NEAREST; `}
 660 fun gl_LINEAR_MIPMAP_NEAREST: GLTexParameteri `{ return GL_LINEAR_MIPMAP_NEAREST; `}
 661 fun gl_NEAREST_MIPMAP_NINEAR: GLTexParameteri `{ return GL_NEAREST_MIPMAP_LINEAR; `}
 662 fun gl_LINEAR_MIPMAP_LINEAR: GLTexParameteri `{ return GL_LINEAR_MIPMAP_LINEAR; `}
 663 fun gl_CLAMP_TO_EDGE: GLTexParameteri `{ return GL_CLAMP_TO_EDGE; `}
 664 fun gl_MIRRORED_REPEAT: GLTexParameteri `{ return GL_MIRRORED_REPEAT; `}
 665 fun gl_REPEAT: GLTexParameteri `{ return GL_REPEAT; `}
 666
 667 # Target texture
 668 extern class GLTextureTarget
 669         super GLEnum
 670 end
 671
 672 # Two-dimensional texture
 673 fun gl_TEXTURE_2D: GLTextureTarget `{ return GL_TEXTURE_2D; `}
 674
 675 # Cube map texture
 676 fun gl_TEXTURE_CUBE_MAP: GLTextureTarget `{ return GL_TEXTURE_CUBE_MAP; `}
 677
 678 # TODO GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
 679 # GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
 680
 681 # A server-side capability
 682 class GLCap
 683
 684         # TODO private init
 685
 686         # Internal OpenGL integer for this capability
 687         private var val: Int
 688
 689         # Enable this server-side capability
 690         fun enable do enable_native(val)
 691         private fun enable_native(cap: Int) `{ glEnable(cap); `}
 692
 693         # Disable this server-side capability
 694         fun disable do disable_native(val)
 695         private fun disable_native(cap: Int) `{ glDisable(cap); `}
 696
 697         redef fun hash do return val
 698         redef fun ==(o) do return o != null and is_same_type(o) and o.hash == self.hash
 699 end
 700
 701 # Generate `n` renderbuffer object names
 702 fun glGenRenderbuffers(n: Int): Array[Int]
 703 do
 704         var array = new CIntArray(n)
 705         native_glGenRenderbuffers(n, array.native_array)
 706         var a = array.to_a
 707         array.destroy
 708         return a
 709 end
 710
 711 private fun native_glGenRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 712         glGenRenderbuffers(n, (GLuint *)renderbuffers);
 713 `}
 714
 715 # Does `name` corresponds to a renderbuffer object?
 716 fun glIsRenderbuffer(name: Int): Bool `{
 717         return glIsRenderbuffer(name);
 718 `}
 719
 720 # Delete named renderbuffer objects
 721 fun glDeleteRenderbuffers(renderbuffers: SequenceRead[Int])
 722 do
 723         var n = renderbuffers.length
 724         var array = new CIntArray.from(renderbuffers)
 725         native_glDeleteRenderbuffers(n, array.native_array)
 726         array.destroy
 727 end
 728
 729 private fun native_glDeleteRenderbuffers(n: Int, renderbuffers: NativeCIntArray) `{
 730         return glDeleteRenderbuffers(n, (const GLuint *)renderbuffers);
 731 `}
 732
 733 # Attach a renderbuffer object to a framebuffer object
 734 fun glFramebufferRenderbuffer(target: GLFramebufferTarget, attachment: GLAttachment,
 735                               renderbuffertarget: GLRenderbufferTarget, renderbuffer: Int) `{
 736         glFramebufferRenderbuffer(target, attachment, renderbuffertarget, renderbuffer);
 737 `}
 738
 739 # Establish data storage, `format` and dimensions of the `target` renderbuffer object's image
 740 fun glRenderbufferStorage(target: GLRenderbufferTarget, format: GLRenderbufferFormat, width, height: Int) `{
 741         glRenderbufferStorage(GL_RENDERBUFFER, format, width, height);
 742 `}
 743
 744 # Format for a renderbuffer
 745 extern class GLRenderbufferFormat
 746         super GLEnum
 747 end
 748
 749 # 4 red, 4 green, 4 blue, 4 alpha bits format
 750 fun gl_RGBA4: GLRenderbufferFormat `{ return GL_RGBA4; `}
 751
 752 # 5 red, 6 green, 5 blue bits format
 753 fun gl_RGB565: GLRenderbufferFormat `{ return GL_RGB565; `}
 754
 755 # 5 red, 5 green, 5 blue, 1 alpha bits format
 756 fun gl_RGB5_A1: GLRenderbufferFormat `{ return GL_RGB5_A1; `}
 757
 758 # 16 depth bits format
 759 fun gl_DEPTH_COMPONENT16: GLRenderbufferFormat `{ return GL_DEPTH_COMPONENT16; `}
 760
 761 # 8 stencil bits format
 762 fun gl_STENCIL_INDEX8: GLRenderbufferFormat `{ return GL_STENCIL_INDEX8; `}
 763
 764 # Renderbuffer attachment point to a framebuffer
 765 extern class GLAttachment
 766         super GLEnum
 767 end
 768
 769 # First color attachment point
 770 fun gl_COLOR_ATTACHMENT0: GLAttachment `{ return GL_COLOR_ATTACHMENT0; `}
 771
 772 # Depth attachment point
 773 fun gl_DEPTH_ATTACHMENT: GLAttachment `{ return GL_DEPTH_ATTACHMENT; `}
 774
 775 # Stencil attachment
 776 fun gl_STENCIL_ATTACHMENT: GLAttachment `{ return GL_STENCIL_ATTACHMENT; `}
 777
 778 redef class Sys
 779         private var gles = new GLES is lazy
 780 end
 781
 782 # Entry points to OpenGL ES 2.0 services
 783 fun gl: GLES do return sys.gles
 784
 785 # OpenGL ES 2.0 services
 786 class GLES
 787
 788         # Query the boolean value at `key`
 789         private fun get_bool(key: Int): Bool `{
 790                 GLboolean val;
 791                 glGetBooleanv(key, &val);
 792                 return val == GL_TRUE;
 793         `}
 794
 795         # Query the floating point value at `key`
 796         private fun get_float(key: Int): Float `{
 797                 GLfloat val;
 798                 glGetFloatv(key, &val);
 799                 return val;
 800         `}
 801
 802         # Query the integer value at `key`
 803         private fun get_int(key: Int): Int `{
 804                 GLint val;
 805                 glGetIntegerv(key, &val);
 806                 return val;
 807         `}
 808
 809         # Does this driver support shader compilation?
 810         #
 811         # Should always return `true` in OpenGL ES 2.0 and 3.0.
 812         fun shader_compiler: Bool do return get_bool(0x8DFA)
 813
 814         # OpenGL server-side capabilities
 815         var capabilities = new GLCapabilities is lazy
 816 end
 817
 818 # Specify the clear values for the color buffer, default values are at 0.0
 819 fun glClearColor(red, green, blue, alpha: Float) `{
 820         glClearColor(red, green, blue, alpha);
 821 `}
 822
 823 # Specify the clear `value` for the depth buffer, default at 1.0
 824 fun glClearDepthf(value: Float) `{ glClearDepthf(value); `}
 825
 826 # Specify the clear `value` for the stencil buffer, default at 0
 827 fun glClearStencil(value: Int) `{ glClearStencil(value); `}
 828
 829 # Clear the `buffer`
 830 fun glClear(buffer: GLBuffer) `{ glClear(buffer); `}
 831
 832 # Enable and disable writing of frame buffer color components
 833 fun glColorMask(red, green, blue, alpha: Bool) `{ glColorMask(red, green, blue, alpha); `}
 834
 835 # Set the viewport
 836 fun glViewport(x, y, width, height: Int) `{ glViewport(x, y, width, height); `}
 837
 838 # Block until all GL execution is complete
 839 fun glFinish `{ glFinish(); `}
 840
 841 # Force execution of GL commands in finite time
 842 fun glFlush `{ glFlush(); `}
 843
 844 # Set texture parameters
 845 fun glTexParameteri(target: GLTextureTarget, pname: GLTexParameteriName, param: GLTexParameteri) `{
 846         glTexParameteri(target, pname, param);
 847 `}
 848
 849 # Name of parameters of textures
 850 extern class GLTexParameteriName
 851         super GLEnum
 852 end
 853
 854 fun gl_TEXTURE_MIN_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MIN_FILTER; `}
 855 fun gl_TEXTURE_MAG_FILTER: GLTexParameteriName `{ return GL_TEXTURE_MAG_FILTER; `}
 856 fun gl_TEXTURE_WRAP_S: GLTexParameteriName `{ return GL_TEXTURE_WRAP_S; `}
 857 fun gl_TEXTURE_WRAP_T: GLTexParameteriName `{ return GL_TEXTURE_WRAP_T; `}
 858
 859 # Bind `framebuffer` to a framebuffer target
 860 #
 861 # In OpenGL ES 2.0, `target` must be `gl_FRAMEBUFFER`.
 862 fun glBindFramebuffer(target: GLFramebufferTarget, framebuffer: Int) `{
 863         glBindFramebuffer(target, framebuffer);
 864 `}
 865
 866 # Target of `glBindFramebuffer`
 867 extern class GLFramebufferTarget
 868         super GLEnum
 869 end
 870
 871 # Target both reading and writing on the framebuffer with `glBindFramebuffer`
 872 fun gl_FRAMEBUFFER: GLFramebufferTarget `{ return GL_FRAMEBUFFER; `}
 873
 874 # Bind `renderbuffer` to a renderbuffer target
 875 #
 876 # In OpenGL ES 2.0, `target` must be `gl_RENDERBUFFER`.
 877 fun glBindRenderbuffer(target: GLRenderbufferTarget, renderbuffer: Int) `{
 878         glBindRenderbuffer(target, renderbuffer);
 879 `}
 880
 881 # Target of `glBindRenderbuffer`
 882 extern class GLRenderbufferTarget
 883         super GLEnum
 884 end
 885
 886 # Target a renderbuffer with `glBindRenderbuffer`
 887 fun gl_RENDERBUFFER: GLRenderbufferTarget `{ return GL_RENDERBUFFER; `}
 888
 889 # Specify implementation specific hints
 890 fun glHint(target: GLHintTarget, mode: GLHintMode) `{
 891         glHint(target, mode);
 892 `}
 893
 894 # Generate and fill set of mipmaps for the texture object `target`
 895 fun glGenerateMipmap(target: GLTextureTarget) `{ glGenerateMipmap(target); `}
 896
 897 # Generate `n` buffer names
 898 fun glGenBuffers(n: Int): Array[Int]
 899 do
 900         var array = new CIntArray(n)
 901         native_glGenBuffers(n, array.native_array)
 902         var a = array.to_a
 903         array.destroy
 904         return a
 905 end
 906
 907 private fun native_glGenBuffers(n: Int, buffers: NativeCIntArray) `{
 908         glGenBuffers(n, (GLuint *)buffers);
 909 `}
 910
 911 # Does `name` corresponds to a buffer object?
 912 fun glIsBuffer(name: Int): Bool `{
 913         return glIsBuffer(name);
 914 `}
 915
 916 # Delete named buffer objects
 917 fun glDeleteBuffers(buffers: SequenceRead[Int])
 918 do
 919         var n = buffers.length
 920         var array = new CIntArray.from(buffers)
 921         native_glDeleteBuffers(n, array.native_array)
 922         array.destroy
 923 end
 924
 925 private fun native_glDeleteBuffers(n: Int, buffers: NativeCIntArray) `{
 926         return glDeleteBuffers(n, (const GLuint *)buffers);
 927 `}
 928
 929 # Create and initialize a buffer object's data store
 930 fun glBufferData(target: GLArrayBuffer, size: Int, data: Pointer, usage: GLBufferUsage) `{
 931         glBufferData(target, size, data, usage);
 932 `}
 933
 934 # Update a subset of a buffer object's data store
 935 fun glBufferSubData(target: GLArrayBuffer, offset, size: Int, data: Pointer) `{
 936         glBufferSubData(target, offset, size, data);
 937 `}
 938
 939 # Expected usage of a buffer
 940 extern class GLBufferUsage
 941         super GLEnum
 942 end
 943
 944 # Data will be modified once and used a few times
 945 fun gl_STREAM_DRAW: GLBufferUsage `{ return GL_STREAM_DRAW; `}
 946
 947 # Data will be modified once and used many times
 948 fun gl_STATIC_DRAW: GLBufferUsage `{ return GL_STATIC_DRAW; `}
 949
 950 # Data will be modified repeatedly and used many times
 951 fun gl_DYNAMIC_DRAW: GLBufferUsage `{ return GL_DYNAMIC_DRAW; `}
 952
 953 # Bind the named `buffer` object
 954 fun glBindBuffer(target: GLArrayBuffer, buffer: Int) `{ glBindBuffer(target, buffer); `}
 955
 956 # Target to which bind the buffer with `glBindBuffer`
 957 extern class GLArrayBuffer
 958         super GLEnum
 959 end
 960
 961 # Array buffer target
 962 fun gl_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ARRAY_BUFFER; `}
 963
 964 # Element array buffer
 965 fun gl_ELEMENT_ARRAY_BUFFER: GLArrayBuffer `{ return GL_ELEMENT_ARRAY_BUFFER; `}
 966
 967 # Completeness status of a framebuffer object
 968 fun glCheckFramebufferStatus(target: GLFramebufferTarget): GLFramebufferStatus `{
 969         return glCheckFramebufferStatus(target);
 970 `}
 971
 972 # Return value of `glCheckFramebufferStatus`
 973 extern class GLFramebufferStatus
 974         super GLEnum
 975
 976         redef fun to_s
 977         do
 978                 if self == gl_FRAMEBUFFER_COMPLETE then return "complete"
 979                 if self == gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT then return "incomplete attachment"
 980                 if self == gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS then return "incomplete dimension"
 981                 if self == gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT then return "incomplete missing attachment"
 982                 if self == gl_FRAMEBUFFER_UNSUPPORTED then return "unsupported"
 983                 return "unknown"
 984         end
 985 end
 986
 987 # The framebuffer is complete
 988 fun gl_FRAMEBUFFER_COMPLETE: GLFramebufferStatus `{
 989         return GL_FRAMEBUFFER_COMPLETE;
 990 `}
 991
 992 # Not all framebuffer attachment points are framebuffer attachment complete
 993 fun gl_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: GLFramebufferStatus `{
 994         return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
 995 `}
 996
 997 # Not all attached images have the same width and height
 998 fun gl_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: GLFramebufferStatus `{
 999         return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
1000 `}
1001
1002 # No images are attached to the framebuffer
1003 fun gl_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: GLFramebufferStatus `{
1004         return GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
1005 `}
1006
1007 # The combination of internal formats of the attached images violates an implementation-dependent set of restrictions
1008 fun gl_FRAMEBUFFER_UNSUPPORTED: GLFramebufferStatus `{
1009         return GL_FRAMEBUFFER_UNSUPPORTED;
1010 `}
1011
1012 # Hint target for `glHint`
1013 extern class GLHintTarget
1014         super GLEnum
1015 end
1016
1017 # Indicates the quality of filtering when generating mipmap images
1018 fun gl_GENERATE_MIPMAP_HINT: GLHintTarget `{ return GL_GENERATE_MIPMAP_HINT; `}
1019
1020 # Hint mode for `glHint`
1021 extern class GLHintMode
1022         super GLEnum
1023 end
1024
1025 # The most efficient option should be chosen
1026 fun gl_FASTEST: GLHintMode `{ return GL_FASTEST; `}
1027
1028 # The most correct, or highest quality, option should be chosen
1029 fun gl_NICEST: GLHintMode `{ return GL_NICEST; `}
1030
1031 # No preference
1032 fun gl_DONT_CARE: GLHintMode `{ return GL_DONT_CARE; `}
1033
1034 # Generate `n` framebuffer object names
1035 fun glGenFramebuffers(n: Int): Array[Int]
1036 do
1037         var array = new CIntArray(n)
1038         native_glGenFramebuffers(n, array.native_array)
1039         var a = array.to_a
1040         array.destroy
1041         return a
1042 end
1043
1044 private fun native_glGenFramebuffers(n: Int, framebuffers: NativeCIntArray) `{
1045         glGenFramebuffers(n, (GLuint *)framebuffers);
1046 `}
1047
1048 # Does `name` corresponds to a framebuffer object?
1049 fun glIsFramebuffer(name: Int): Bool `{
1050         return glIsFramebuffer(name);
1051 `}
1052
1053 # Delete named framebuffer objects
1054 fun glDeleteFramebuffers(framebuffers: SequenceRead[Int])
1055 do
1056         var n = framebuffers.length
1057         var array = new CIntArray.from(framebuffers)
1058         native_glDeleteFramebuffers(n, array.native_array)
1059         array.destroy
1060 end
1061
1062 private fun native_glDeleteFramebuffers(n: Int, framebuffers: NativeCIntArray) `{
1063         return glDeleteFramebuffers(n, (const GLuint *)framebuffers);
1064 `}
1065
1066 # Attach a level of a texture object as a logical buffer to the currently bound framebuffer object
1067 fun glFramebufferTexture2D(target: GLFramebufferTarget, attachment: GLAttachment,
1068                            texture_target: GLTextureTarget,  texture, level: Int) `{
1069         glFramebufferTexture2D(target, attachment, texture_target, texture, level);
1070 `}
1071
1072 # Entry point to OpenGL server-side capabilities
1073 class GLCapabilities
1074
1075         # GL capability: blend the computed fragment color values
1076         #
1077         # Foreign: GL_BLEND
1078         var blend: GLCap is lazy do return new GLCap(0x0BE2)
1079
1080         # GL capability: cull polygons based of their winding in window coordinates
1081         #
1082         # Foreign: GL_CULL_FACE
1083         var cull_face: GLCap is lazy do return new GLCap(0x0B44)
1084
1085         # GL capability: do depth comparisons and update the depth buffer
1086         #
1087         # Foreign: GL_DEPTH_TEST
1088         var depth_test: GLCap is lazy do return new GLCap(0x0B71)
1089
1090         # GL capability: dither color components or indices before they are written to the color buffer
1091         #
1092         # Foreign: GL_DITHER
1093         var dither: GLCap is lazy do return new GLCap(0x0BE2)
1094
1095         # GL capability: add an offset to depth values of a polygon fragment before depth test
1096         #
1097         # Foreign: GL_POLYGON_OFFSET_FILL
1098         var polygon_offset_fill: GLCap is lazy do return new GLCap(0x8037)
1099
1100         # GL capability: compute a temporary coverage value where each bit is determined by the alpha value at the corresponding location
1101         #
1102         # Foreign: GL_SAMPLE_ALPHA_TO_COVERAGE
1103         var sample_alpha_to_coverage: GLCap is lazy do return new GLCap(0x809E)
1104
1105         # GL capability: AND the fragment coverage with the temporary coverage value
1106         #
1107         # Foreign: GL_SAMPLE_COVERAGE
1108         var sample_coverage: GLCap is lazy do return new GLCap(0x80A0)
1109
1110         # GL capability: discard fragments that are outside the scissor rectangle
1111         #
1112         # Foreign: GL_SCISSOR_TEST
1113         var scissor_test: GLCap is lazy do return new GLCap(0x0C11)
1114
1115         # GL capability: do stencil testing and update the stencil buffer
1116         #
1117         # Foreign: GL_STENCIL_TEST
1118         var stencil_test: GLCap is lazy do return new GLCap(0x0B90)
1119 end
1120
1121 # All data types of OpenGL ES 2.0 shaders
1122 #
1123 # These types can be used by shader uniforms, as seen with
1124 # `GLProgram::active_uniform_type`.
1125 extern class GLDataType
1126         super GLEnum
1127 end
1128
1129 fun gl_FLOAT: GLDataType `{ return GL_FLOAT; `}
1130 fun gl_FLOAT_VEC2: GLDataType `{ return GL_FLOAT_VEC2; `}
1131 fun gl_FLOAT_VEC3: GLDataType `{ return GL_FLOAT_VEC3; `}
1132 fun gl_FLOAT_VEC4: GLDataType `{ return GL_FLOAT_VEC4; `}
1133 fun gl_FLOAT_MAT2: GLDataType `{ return GL_FLOAT_MAT2; `}
1134 fun gl_FLOAT_MAT3: GLDataType `{ return GL_FLOAT_MAT3; `}
1135 fun gl_FLOAT_MAT4: GLDataType `{ return GL_FLOAT_MAT4; `}
1136
1137 fun gl_BYTE: GLDataType `{ return GL_BYTE; `}
1138 fun gl_UNSIGNED_BYTE: GLDataType `{ return GL_UNSIGNED_BYTE; `}
1139 fun gl_SHORT: GLDataType `{ return GL_SHORT; `}
1140 fun gl_UNSIGNED_SHORT: GLDataType `{ return GL_UNSIGNED_SHORT; `}
1141 fun gl_INT: GLDataType `{ return GL_INT; `}
1142 fun gl_UNSIGNED_INT: GLDataType `{ return GL_UNSIGNED_INT; `}
1143 fun gl_FIXED: GLDataType `{ return GL_FIXED; `}
1144 fun gl_INT_VEC2: GLDataType `{ return GL_INT_VEC2; `}
1145 fun gl_INT_VEC3: GLDataType `{ return GL_INT_VEC3; `}
1146 fun gl_INT_VEC4: GLDataType `{ return GL_INT_VEC4; `}
1147 fun gl_BOOL: GLDataType `{ return GL_BOOL; `}
1148 fun gl_BOOL_VEC2: GLDataType `{ return GL_BOOL_VEC2; `}
1149 fun gl_BOOL_VEC3: GLDataType `{ return GL_BOOL_VEC3; `}
1150 fun gl_BOOL_VEC4: GLDataType `{ return GL_BOOL_VEC4; `}
1151 fun gl_SAMPLER_2D: GLDataType `{ return GL_SAMPLER_2D; `}
1152 fun gl_SAMPLER_CUBE: GLDataType `{ return GL_SAMPLER_CUBE; `}
1153
1154 fun gl_UNSIGNED_SHORT_5_6_5: GLDataType `{ return GL_UNSIGNED_SHORT_5_6_5; `}
1155 fun gl_UNSIGNED_SHORT_4_4_4_4: GLDataType `{ return GL_UNSIGNED_SHORT_4_4_4_4; `}
1156 fun gl_UNSIGNED_SHORT_5_5_5_1: GLDataType `{ return GL_UNSIGNED_SHORT_5_5_5_1; `}
1157
1158 # Kind of primitives to render
1159 extern class GLDrawMode
1160         super GLEnum
1161 end
1162
1163 fun gl_POINTS: GLDrawMode `{ return GL_POINTS; `}
1164 fun gl_LINES: GLDrawMode `{ return GL_LINES; `}
1165 fun gl_LINE_LOOP: GLDrawMode `{ return GL_LINE_LOOP; `}
1166 fun gl_LINE_STRIP: GLDrawMode `{ return GL_LINE_STRIP; `}
1167 fun gl_TRIANGLES: GLDrawMode `{ return GL_TRIANGLES; `}
1168 fun gl_TRIANGLE_STRIP: GLDrawMode `{ return GL_TRIANGLE_STRIP; `}
1169 fun gl_TRIANGLE_FAN: GLDrawMode `{ return GL_TRIANGLE_FAN; `}
1170
1171 # Pixel arithmetic for blending operations
1172 extern class GLBlendFactor
1173         super GLEnum
1174 end
1175
1176 fun gl_ZERO: GLBlendFactor `{ return GL_ZERO; `}
1177 fun gl_ONE: GLBlendFactor `{ return GL_ONE; `}
1178 fun gl_SRC_COLOR: GLBlendFactor `{ return GL_SRC_COLOR; `}
1179 fun gl_ONE_MINUS_SRC_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_SRC_COLOR; `}
1180 fun gl_SRC_ALPHA: GLBlendFactor `{ return GL_SRC_ALPHA; `}
1181 fun gl_ONE_MINUS_SRC_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_SRC_ALPHA; `}
1182 fun gl_DST_ALPHA: GLBlendFactor `{ return GL_DST_ALPHA; `}
1183 fun gl_ONE_MINUS_DST_ALPHA: GLBlendFactor `{ return GL_ONE_MINUS_DST_ALPHA; `}
1184 fun gl_DST_COLOR: GLBlendFactor `{ return GL_DST_COLOR; `}
1185 fun gl_ONE_MINUS_DST_COLOR: GLBlendFactor `{ return GL_ONE_MINUS_DST_COLOR; `}
1186 fun gl_SRC_ALPHA_SATURATE: GLBlendFactor `{ return GL_SRC_ALPHA_SATURATE; `}
1187
1188 # Condition under which a pixel will be drawn
1189 extern class GLDepthFunc
1190         super GLEnum
1191 end
1192
1193 fun gl_NEVER: GLDepthFunc `{ return GL_NEVER; `}
1194 fun gl_LESS: GLDepthFunc `{ return GL_LESS; `}
1195 fun gl_EQUAL: GLDepthFunc `{ return GL_EQUAL; `}
1196 fun gl_LEQUAL: GLDepthFunc `{ return GL_LEQUAL; `}
1197 fun gl_GREATER: GLDepthFunc `{ return GL_GREATER; `}
1198 fun gl_NOTEQUAL: GLDepthFunc `{ return GL_NOTEQUAL; `}
1199 fun gl_GEQUAL: GLDepthFunc `{ return GL_GEQUAL; `}
1200 fun gl_ALWAYS: GLDepthFunc `{ return GL_ALWAYS; `}
1201
1202 # Format of pixel data
1203 extern class GLPixelFormat
1204         super GLEnum
1205 end
1206
1207 fun gl_ALPHA: GLPixelFormat `{ return GL_ALPHA; `}
1208 fun gl_RGB: GLPixelFormat `{ return GL_RGB; `}
1209 fun gl_RGBA: GLPixelFormat `{ return GL_RGBA; `}
1210 fun gl_DEPTH_COMPONENT: GLPixelFormat `{ return GL_DEPTH_COMPONENT; `}
1211
1212 # Set of buffers as a bitwise OR mask
1213 extern class GLBuffer `{ GLbitfield `}
1214         # Bitwise OR with `other`
1215         fun |(other: GLBuffer): GLBuffer `{ return self | other; `}
1216 end
1217
1218 fun gl_DEPTH_BUFFER_BIT: GLBuffer `{ return GL_DEPTH_BUFFER_BIT; `}
1219 fun gl_STENCIL_BUFFER_BIT: GLBuffer `{ return GL_STENCIL_BUFFER_BIT; `}
1220 fun gl_COLOR_BUFFER_BIT: GLBuffer `{ return GL_COLOR_BUFFER_BIT; `}
1221
1222 # Define front- and back-facing polygons, `gc_CCW` by default
1223 fun glFrontFace(mode: GLFrontFaceMode) `{ glFrontFace(mode); `}
1224
1225 # Orientation of front-facing polygons
1226 extern class GLFrontFaceMode
1227         super GLEnum
1228 end
1229
1230 fun gl_CW: GLFrontFaceMode `{ return GL_CW; `}
1231 fun gl_CCW: GLFrontFaceMode `{ return GL_CCW; `}
1232
1233 # Specify whether front- or back-facing polygons can be culled, default is `back` only
1234 fun glCullFace(mode: GLCullFaceMode) `{ glCullFace(mode); `}
1235
1236 # Candidates for culling
1237 extern class GLCullFaceMode
1238         super GLEnum
1239 end
1240
1241 fun gl_FRONT: GLCullFaceMode `{ return GL_FRONT; `}
1242 fun gl_BACK: GLCullFaceMode `{ return GL_BACK; `}
1243 fun gl_FRONT_AND_BACK: GLCullFaceMode `{ return GL_FRONT_AND_BACK; `}
1244
1245 # Specify mapping of depth values from normalized device coordinates to window coordinates
1246 #
1247 # Default at 0.0, 1.0.
1248 fun glDepthRangef(near, far: Float) `{ glDepthRangef(near, far); `}
1249
1250 # Enable or disable writing into the depth buffer
1251 fun glDepthMask(value: Bool) `{ glDepthMask(value); `}
1252
1253 # Specify the value used for depth buffer comparisons
1254 #
1255 # Default value is `gl_LESS`
1256 fun glDepthFunc(func: GLDepthFunc) `{ glDepthFunc(func); `}
1257
1258 # Set the pixel arithmetic for the blending operations
1259 #
1260 # Default values:
1261 # * `src_factor`: `gl_ONE`
1262 # * `dst_factor`: `gl_ZERO`
1263 fun glBlendFunc(src_factor, dst_factor: GLBlendFactor) `{
1264         glBlendFunc(src_factor, dst_factor);
1265 `}
1266
1267 # Set the scale and units used to calculate depth values
1268 fun glPolygonOffset(factor, units: Float) `{ glPolygonOffset(factor, units); `}
1269
1270 # Specify the width of rasterized lines
1271 fun glLineWidth(width: Float) `{ glLineWidth(width); `}
1272
1273 # Get the value of the parameter `pname` at `offset`
1274 fun glGetBooleanv(pname: GLGetParameterName, offset: Int): Bool `{
1275         GLboolean v[4];
1276         glGetBooleanv(pname, v);
1277         return v[offset];
1278 `}
1279
1280 # Get the value of the parameter `pname` at `offset`
1281 fun glGetFloatv(pname: GLGetParameterName, offset: Int): Float `{
1282         GLfloat v[4];
1283         glGetFloatv(pname, v);
1284         return v[offset];
1285 `}
1286
1287 # Get the value of the parameter `pname` at `offset`
1288 fun glGetIntegerv(pname: GLGetParameterName, offset: Int): Int `{
1289         GLint v[4];
1290         glGetIntegerv(pname, v);
1291         return v[offset];
1292 `}
1293
1294 fun gl_COLOR_CLEAR_VALUE: GLGetParameterName `{ return GL_COLOR_CLEAR_VALUE; `}
1295
1296 fun gl_MAX_TEXTURE_SIZE: GLGetParameterName `{ return GL_MAX_TEXTURE_SIZE; `}
1297 fun gl_MAX_VIEWPORT_DIMS: GLGetParameterName `{ return GL_MAX_VIEWPORT_DIMS; `}
1298 fun gl_MAX_VERTEX_ATTRIBS: GLGetParameterName `{ return GL_MAX_VERTEX_ATTRIBS; `}
1299 fun gl_MAX_VERTEX_UNIFORM_VECTORS: GLGetParameterName `{ return GL_MAX_VERTEX_UNIFORM_VECTORS; `}
1300 fun gl_MAX_VARYING_VECTORS: GLGetParameterName `{ return GL_MAX_VARYING_VECTORS; `}
1301 fun gl_MAX_COMBINED_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS; `}
1302 fun gl_MAX_VERTEX_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS; `}
1303 fun gl_MAX_TEXTURE_IMAGE_UNITS: GLGetParameterName `{ return GL_MAX_TEXTURE_IMAGE_UNITS; `}
1304 fun gl_MAX_FRAGMENT_UNIFORM_VECTORS: GLGetParameterName `{ return GL_MAX_FRAGMENT_UNIFORM_VECTORS; `}
1305
1306 fun gl_ARRAY_BUFFER_BINDING: GLGetParameterName `{ return GL_ARRAY_BUFFER_BINDING; `}
1307 fun gl_ELEMENT_ARRAY_BUFFER_BINDING: GLGetParameterName `{ return GL_ELEMENT_ARRAY_BUFFER_BINDING; `}
1308 fun gl_TEXTURE_BINDING_2D: GLGetParameterName `{ return GL_TEXTURE_BINDING_2D; `}
1309 fun gl_TEXTURE_BINDING_CUBE_MAP: GLGetParameterName `{ return GL_TEXTURE_BINDING_CUBE_MAP; `}
1310 fun gl_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING: GLGetParameterName `{ return GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING; `}
1311 fun gl_FRAMEBUFFER_BINDING: GLGetParameterName `{ return GL_FRAMEBUFFER_BINDING; `}
1312 fun gl_RENDERBUFFER_BINDING: GLGetParameterName `{ return GL_RENDERBUFFER_BINDING; `}
1313
1314 # Return a string describing the current GL configuration
1315 fun glGetString(name: GLEnum): String do return glGetString_native(name).to_s
1316 private fun glGetString_native(name: GLEnum): CString `{ return (char*)glGetString(name); `}
1317
1318 # Company responsible for this GL implementation
1319 fun gl_VENDOR: GLEnum `{ return GL_VENDOR; `}
1320
1321 # Name of the renderer, typically specific to a particular configuration of the hardware platform
1322 fun gl_RENDERER: GLEnum `{ return GL_RENDERER; `}
1323
1324 # Version or release number
1325 fun gl_VERSION: GLEnum `{ return GL_VERSION; `}
1326
1327 # Version or release number for the shading language of the form
1328 fun gl_SHADING_LANGUAGE_VERSION: GLEnum `{ return GL_SHADING_LANGUAGE_VERSION; `}
1329
1330 # Space-separated list of supported extensions to GL
1331 fun gl_EXTENSIONS: GLEnum `{ return GL_EXTENSIONS; `}