extra/gpu/state/state.factor

   1 ! (c)2009 Joe Groff bsd license
   2 USING: accessors alien.c-types arrays byte-arrays combinators gpu
   3 kernel literals math math.rectangles opengl opengl.gl sequences
   4 variants specialized-arrays.int specialized-arrays.float ;
   5 IN: gpu.state
   6
   7 UNION: ?rect rect POSTPONE: f ;
   8 UNION: ?float float POSTPONE: f ;
   9
  10 TUPLE: viewport-state
  11     { rect rect read-only } ;
  12 C: <viewport-state> viewport-state
  13
  14 TUPLE: scissor-state
  15     { rect ?rect read-only } ;
  16 C: <scissor-state> scissor-state
  17
  18 TUPLE: multisample-state
  19     { multisample? boolean read-only }
  20     { sample-alpha-to-coverage? boolean read-only }
  21     { sample-alpha-to-one? boolean read-only }
  22     { sample-coverage ?float read-only }
  23     { invert-sample-coverage? boolean read-only } ;
  24 C: <multisample-state> multisample-state
  25
  26 VARIANT: comparison
  27     cmp-never cmp-always
  28     cmp-less cmp-less-equal cmp-equal
  29     cmp-greater-equal cmp-greater cmp-not-equal ;
  30 VARIANT: stencil-op
  31     op-keep op-zero
  32     op-replace op-invert
  33     op-inc-sat op-dec-sat
  34     op-inc-wrap op-dec-wrap ;
  35
  36 UNION: ?comparison comparison POSTPONE: f ;
  37
  38 TUPLE: stencil-mode
  39     { value integer initial: 0 read-only }
  40     { mask integer initial: HEX: FFFFFFFF read-only }
  41     { comparison comparison initial: cmp-always read-only }
  42     { stencil-fail-op stencil-op initial: op-keep read-only }
  43     { depth-fail-op stencil-op initial: op-keep read-only }
  44     { depth-pass-op stencil-op initial: op-keep read-only } ;
  45 C: <stencil-mode> stencil-mode
  46
  47 UNION: ?stencil-mode stencil-mode POSTPONE: f ;
  48
  49 TUPLE: stencil-state
  50     { front-mode ?stencil-mode initial: f read-only }
  51     { back-mode ?stencil-mode initial: f read-only } ;
  52 C: <stencil-state> stencil-state
  53
  54 TUPLE: depth-range-state
  55     { near float initial: 0.0 read-only }
  56     { far  float initial: 1.0 read-only } ;
  57 C: <depth-range-state> depth-range-state
  58
  59 TUPLE: depth-state
  60     { comparison ?comparison initial: f read-only } ;
  61 C: <depth-state> depth-state
  62
  63 VARIANT: blend-equation
  64     eq-add eq-subtract eq-reverse-subtract eq-min eq-max ;
  65 VARIANT: blend-function
  66     func-zero func-one
  67     func-source func-one-minus-source
  68     func-dest func-one-minus-dest
  69     func-constant func-one-minus-constant
  70     func-source-alpha func-one-minus-source-alpha
  71     func-dest-alpha func-one-minus-dest-alpha
  72     func-constant-alpha func-one-minus-constant-alpha ;
  73
  74 VARIANT: source-only-blend-function
  75     func-source-alpha-saturate ;
  76
  77 UNION: source-blend-function blend-function source-only-blend-function ;
  78
  79 TUPLE: blend-mode
  80     { equation blend-equation initial: eq-add read-only }
  81     { source-function source-blend-function initial: func-source-alpha read-only }
  82     { dest-function blend-function initial: func-one-minus-source-alpha read-only } ;
  83 C: <blend-mode> blend-mode
  84
  85 UNION: ?blend-mode blend-mode POSTPONE: f ;
  86
  87 TUPLE: blend-state
  88     { constant-color sequence initial: f read-only }
  89     { rgb-mode ?blend-mode read-only }
  90     { alpha-mode ?blend-mode read-only } ;
  91 C: <blend-state> blend-state
  92
  93 TUPLE: mask-state
  94     { color sequence initial: { t t t t } read-only }
  95     { depth boolean initial: t read-only }
  96     { stencil-front integer initial: HEX: FFFFFFFF read-only }
  97     { stencil-back integer initial: HEX: FFFFFFFF read-only } ;
  98 C: <mask-state> mask-state
  99
 100 VARIANT: triangle-face
 101     face-ccw face-cw ;
 102 VARIANT: triangle-cull
 103     cull-front cull-back cull-all ;
 104 VARIANT: triangle-mode
 105     triangle-points triangle-lines triangle-fill ;
 106
 107 UNION: ?triangle-cull triangle-cull POSTPONE: f ;
 108
 109 TUPLE: triangle-cull-state
 110     { front-face triangle-face initial: face-ccw read-only }
 111     { cull ?triangle-cull initial: f read-only } ;
 112 C: <triangle-cull-state> triangle-cull-state
 113
 114 TUPLE: triangle-state
 115     { front-mode triangle-mode initial: triangle-fill read-only }
 116     { back-mode triangle-mode initial: triangle-fill read-only }
 117     { antialias? boolean initial: f read-only } ;
 118 C: <triangle-state> triangle-state
 119
 120 VARIANT: point-sprite-origin
 121     origin-upper-left origin-lower-left ;
 122
 123 TUPLE: point-state
 124     { size ?float initial: 1.0 read-only }
 125     { sprite-origin point-sprite-origin initial: origin-upper-left read-only }
 126     { fade-threshold float initial: 1.0 read-only } ;
 127 C: <point-state> point-state
 128
 129 TUPLE: line-state
 130     { width float initial: 1.0 read-only }
 131     { antialias? boolean initial: f read-only } ;
 132 C: <line-state> line-state
 133
 134 UNION: gpu-state
 135     viewport-state
 136     triangle-cull-state
 137     triangle-state
 138     point-state
 139     line-state
 140     scissor-state
 141     multisample-state
 142     stencil-state
 143     depth-range-state
 144     depth-state
 145     blend-state
 146     mask-state ;
 147
 148 <PRIVATE
 149
 150 : gl-triangle-face ( triangle-face -- face )
 151     {
 152         { face-ccw [ GL_CCW ] }
 153         { face-cw  [ GL_CW  ] }
 154     } case ;
 155
 156 : gl-triangle-face> ( triangle-face -- face )
 157     {
 158         { $ GL_CCW [ face-ccw ] }
 159         { $ GL_CW  [ face-cw  ] }
 160     } case ;
 161
 162 : gl-triangle-cull ( triangle-cull -- cull )
 163     {
 164         { cull-front [ GL_FRONT          ] }
 165         { cull-back  [ GL_BACK           ] }
 166         { cull-all   [ GL_FRONT_AND_BACK ] }
 167     } case ;
 168
 169 : gl-triangle-cull> ( triangle-cull -- cull )
 170     {
 171         { $ GL_FRONT          [ cull-front ] }
 172         { $ GL_BACK           [ cull-back  ] }
 173         { $ GL_FRONT_AND_BACK [ cull-all   ] }
 174     } case ;
 175
 176 : gl-triangle-mode ( triangle-mode -- mode )
 177     {
 178         { triangle-points [ GL_POINT ] }
 179         { triangle-lines  [ GL_LINE  ] }
 180         { triangle-fill   [ GL_FILL  ] }
 181     } case ;
 182
 183 : gl-triangle-mode> ( triangle-mode -- mode )
 184     {
 185         { $ GL_POINT [ triangle-points ] }
 186         { $ GL_LINE  [ triangle-lines  ] }
 187         { $ GL_FILL  [ triangle-fill   ] }
 188     } case ;
 189
 190 : gl-point-sprite-origin ( point-sprite-origin -- sprite-origin )
 191     {
 192         { origin-upper-left [ GL_UPPER_LEFT ] }
 193         { origin-lower-left [ GL_LOWER_LEFT ] }
 194     } case ;
 195
 196 : gl-point-sprite-origin> ( point-sprite-origin -- sprite-origin )
 197     {
 198         { $ GL_UPPER_LEFT [ origin-upper-left ] }
 199         { $ GL_LOWER_LEFT [ origin-lower-left ] }
 200     } case ;
 201
 202 : gl-comparison ( comparison -- comparison )
 203     {
 204         { cmp-never         [ GL_NEVER    ] }
 205         { cmp-always        [ GL_ALWAYS   ] }
 206         { cmp-less          [ GL_LESS     ] }
 207         { cmp-less-equal    [ GL_LEQUAL   ] }
 208         { cmp-equal         [ GL_EQUAL    ] }
 209         { cmp-greater-equal [ GL_GEQUAL   ] }
 210         { cmp-greater       [ GL_GREATER  ] }
 211         { cmp-not-equal     [ GL_NOTEQUAL ] }
 212     } case ;
 213
 214 : gl-comparison> ( comparison -- comparison )
 215     {
 216         { $ GL_NEVER    [ cmp-never         ] }
 217         { $ GL_ALWAYS   [ cmp-always        ] }
 218         { $ GL_LESS     [ cmp-less          ] }
 219         { $ GL_LEQUAL   [ cmp-less-equal    ] }
 220         { $ GL_EQUAL    [ cmp-equal         ] }
 221         { $ GL_GEQUAL   [ cmp-greater-equal ] }
 222         { $ GL_GREATER  [ cmp-greater       ] }
 223         { $ GL_NOTEQUAL [ cmp-not-equal     ] }
 224     } case ;
 225
 226 : gl-stencil-op ( stencil-op -- op )
 227     {
 228         { op-keep [ GL_KEEP ] }
 229         { op-zero [ GL_ZERO ] }
 230         { op-replace [ GL_REPLACE ] }
 231         { op-invert [ GL_INVERT ] }
 232         { op-inc-sat [ GL_INCR ] }
 233         { op-dec-sat [ GL_DECR ] }
 234         { op-inc-wrap [ GL_INCR_WRAP ] }
 235         { op-dec-wrap [ GL_DECR_WRAP ] }
 236     } case ;
 237
 238 : gl-stencil-op> ( op -- op )
 239     {
 240         { $ GL_KEEP      [ op-keep     ] }
 241         { $ GL_ZERO      [ op-zero     ] }
 242         { $ GL_REPLACE   [ op-replace  ] }
 243         { $ GL_INVERT    [ op-invert   ] }
 244         { $ GL_INCR      [ op-inc-sat  ] }
 245         { $ GL_DECR      [ op-dec-sat  ] }
 246         { $ GL_INCR_WRAP [ op-inc-wrap ] }
 247         { $ GL_DECR_WRAP [ op-dec-wrap ] }
 248     } case ;
 249
 250 : (set-stencil-mode) ( gl-face stencil-mode -- )
 251     {
 252         [ [ comparison>> gl-comparison ] [ value>> ] [ mask>> ] tri glStencilFuncSeparate ]
 253         [
 254             [ stencil-fail-op>> ] [ depth-fail-op>> ] [ depth-pass-op>> ] tri
 255             [ gl-stencil-op ] tri@ glStencilOpSeparate
 256         ]
 257     } 2cleave ;
 258
 259 : gl-blend-equation ( blend-equation -- blend-equation )
 260     {
 261         { eq-add              [ GL_FUNC_ADD              ] }
 262         { eq-subtract         [ GL_FUNC_SUBTRACT         ] }
 263         { eq-reverse-subtract [ GL_FUNC_REVERSE_SUBTRACT ] }
 264         { eq-min              [ GL_MIN                   ] }
 265         { eq-max              [ GL_MAX                   ] }
 266     } case ;
 267
 268 : gl-blend-equation> ( blend-equation -- blend-equation )
 269     {
 270         { $ GL_FUNC_ADD              [ eq-add              ] }
 271         { $ GL_FUNC_SUBTRACT         [ eq-subtract         ] }
 272         { $ GL_FUNC_REVERSE_SUBTRACT [ eq-reverse-subtract ] }
 273         { $ GL_MIN                   [ eq-min              ] }
 274         { $ GL_MAX                   [ eq-max              ] }
 275     } case ;
 276
 277 : gl-blend-function ( blend-function -- blend-function )
 278     {
 279         { func-zero                     [ GL_ZERO                     ] }
 280         { func-one                      [ GL_ONE                      ] }
 281         { func-source                   [ GL_SRC_COLOR                ] }
 282         { func-one-minus-source         [ GL_ONE_MINUS_SRC_COLOR      ] }
 283         { func-dest                     [ GL_DST_COLOR                ] }
 284         { func-one-minus-dest           [ GL_ONE_MINUS_DST_COLOR      ] }
 285         { func-constant                 [ GL_CONSTANT_COLOR           ] }
 286         { func-one-minus-constant       [ GL_ONE_MINUS_CONSTANT_COLOR ] }
 287         { func-source-alpha             [ GL_SRC_ALPHA                ] }
 288         { func-one-minus-source-alpha   [ GL_ONE_MINUS_SRC_ALPHA      ] }
 289         { func-dest-alpha               [ GL_DST_ALPHA                ] }
 290         { func-one-minus-dest-alpha     [ GL_ONE_MINUS_DST_ALPHA      ] }
 291         { func-constant-alpha           [ GL_CONSTANT_ALPHA           ] }
 292         { func-one-minus-constant-alpha [ GL_ONE_MINUS_CONSTANT_ALPHA ] }
 293         { func-source-alpha-saturate    [ GL_SRC_ALPHA_SATURATE       ] }
 294     } case ;
 295
 296 : gl-blend-function> ( blend-function -- blend-function )
 297     {
 298         { $ GL_ZERO                     [ func-zero                     ] }
 299         { $ GL_ONE                      [ func-one                      ] }
 300         { $ GL_SRC_COLOR                [ func-source                   ] }
 301         { $ GL_ONE_MINUS_SRC_COLOR      [ func-one-minus-source         ] }
 302         { $ GL_DST_COLOR                [ func-dest                     ] }
 303         { $ GL_ONE_MINUS_DST_COLOR      [ func-one-minus-dest           ] }
 304         { $ GL_CONSTANT_COLOR           [ func-constant                 ] }
 305         { $ GL_ONE_MINUS_CONSTANT_COLOR [ func-one-minus-constant       ] }
 306         { $ GL_SRC_ALPHA                [ func-source-alpha             ] }
 307         { $ GL_ONE_MINUS_SRC_ALPHA      [ func-one-minus-source-alpha   ] }
 308         { $ GL_DST_ALPHA                [ func-dest-alpha               ] }
 309         { $ GL_ONE_MINUS_DST_ALPHA      [ func-one-minus-dest-alpha     ] }
 310         { $ GL_CONSTANT_ALPHA           [ func-constant-alpha           ] }
 311         { $ GL_ONE_MINUS_CONSTANT_ALPHA [ func-one-minus-constant-alpha ] }
 312         { $ GL_SRC_ALPHA_SATURATE       [ func-source-alpha-saturate    ] }
 313     } case ;
 314
 315 PRIVATE>
 316
 317 GENERIC: set-gpu-state* ( state -- )
 318
 319 M: viewport-state set-gpu-state*
 320     rect>> [ loc>> first2 ] [ dim>> first2 ] bi glViewport ;
 321
 322 M: triangle-cull-state set-gpu-state*
 323     {
 324         [ front-face>> gl-triangle-face glFrontFace ]
 325         [ GL_CULL_FACE swap cull>> [ gl-triangle-cull glCullFace glEnable ] [ glDisable ] if* ]
 326     } cleave ;
 327
 328 M: triangle-state set-gpu-state*
 329     {
 330         [ GL_FRONT swap front-mode>> gl-triangle-mode glPolygonMode ]
 331         [ GL_BACK swap back-mode>> gl-triangle-mode glPolygonMode ]
 332         [ GL_POLYGON_SMOOTH swap antialias?>> [ glEnable ] [ glDisable ] if ]
 333     } cleave ;
 334
 335 M: point-state set-gpu-state*
 336     {
 337         [ GL_VERTEX_PROGRAM_POINT_SIZE swap size>> [ glPointSize glDisable ] [ glEnable ] if* ]
 338         [ GL_POINT_SPRITE_COORD_ORIGIN swap sprite-origin>> gl-point-sprite-origin glPointParameteri ]
 339         [ GL_POINT_FADE_THRESHOLD_SIZE swap fade-threshold>> glPointParameterf ]
 340     } cleave ;
 341
 342 M: line-state set-gpu-state*
 343     {
 344         [ width>> glLineWidth ]
 345         [ GL_LINE_SMOOTH swap antialias?>> [ glEnable ] [ glDisable ] if ]
 346     } cleave ;
 347
 348 M: scissor-state set-gpu-state*
 349     GL_SCISSOR_TEST swap rect>>
 350     [ [ loc>> first2 ] [ dim>> first2 ] bi glViewport glEnable ]
 351     [ glDisable ] if* ;
 352
 353 M: multisample-state set-gpu-state*
 354     dup multisample?>> [
 355         GL_MULTISAMPLE glEnable
 356         {
 357             [ GL_SAMPLE_ALPHA_TO_COVERAGE swap sample-alpha-to-coverage?>>
 358                 [ glEnable ] [ glDisable ] if
 359             ]
 360             [ GL_SAMPLE_ALPHA_TO_ONE swap sample-alpha-to-one?>>
 361                 [ glEnable ] [ glDisable ] if
 362             ]
 363             [ GL_SAMPLE_COVERAGE swap [ invert-sample-coverage?>> >c-bool ] [ sample-coverage>> ] bi
 364                 [ swap glSampleCoverage glEnable ] [ drop glDisable ] if*
 365             ]
 366         } cleave
 367     ] [ drop GL_MULTISAMPLE glDisable ] if ;
 368
 369 M: stencil-state set-gpu-state*
 370     [ ] [ front-mode>> ] [ back-mode>> ] tri or
 371     [
 372         GL_STENCIL_TEST glEnable
 373         [ front-mode>> GL_FRONT swap (set-stencil-mode) ]
 374         [ back-mode>> GL_BACK swap (set-stencil-mode) ] bi
 375     ] [ drop GL_STENCIL_TEST glDisable ] if ;
 376
 377 M: depth-range-state set-gpu-state*
 378     [ near>> ] [ far>> ] bi glDepthRange ;
 379
 380 M: depth-state set-gpu-state*
 381     GL_DEPTH_TEST swap comparison>> [ gl-comparison glDepthFunc glEnable ] [ glDisable ] if* ;
 382
 383 M: blend-state set-gpu-state*
 384     [ ] [ rgb-mode>> ] [ alpha-mode>> ] tri or
 385     [
 386         GL_BLEND glEnable
 387         [ constant-color>> [ first4 glBlendColor ] when* ]
 388         [
 389             [ rgb-mode>> ] [ alpha-mode>> ] bi {
 390                 [ [ equation>> gl-blend-equation ] bi@ glBlendEquationSeparate ]
 391                 [
 392                     [
 393                         [ source-function>> gl-blend-function ]
 394                         [ dest-function>> gl-blend-function ] bi
 395                     ] bi@ glBlendFuncSeparate
 396                 ]
 397             } 2cleave
 398         ] bi
 399     ] [ drop GL_BLEND glDisable ] if ;
 400
 401 M: mask-state set-gpu-state*
 402     {
 403         [ color>> [ >c-bool ] map first4 glColorMask ]
 404         [ depth>> >c-bool glDepthMask ]
 405         [ GL_FRONT swap stencil-front>> glStencilMaskSeparate ]
 406         [ GL_BACK  swap stencil-back>> glStencilMaskSeparate ]
 407     } cleave ;
 408
 409 : set-gpu-state ( states -- )
 410     dup sequence?
 411     [ [ set-gpu-state* ] each ]
 412     [ set-gpu-state* ] if ; inline
 413
 414 <PRIVATE
 415
 416 : get-gl-bool ( enum -- value )
 417     0 <uchar> [ glGetBooleanv ] keep *uchar c-bool> ;
 418 : get-gl-int ( enum -- value )
 419     0 <int> [ glGetIntegerv ] keep *int ;
 420 : get-gl-float ( enum -- value )
 421     0 <float> [ glGetFloatv ] keep *float ;
 422
 423 : get-gl-bools ( enum count -- value )
 424     <byte-array> [ glGetBooleanv ] keep [ c-bool> ] { } map-as ;
 425 : get-gl-ints ( enum count -- value )
 426     <int-array> [ glGetIntegerv ] keep ;
 427 : get-gl-floats ( enum count -- value )
 428     <float-array> [ glGetFloatv ] keep ;
 429
 430 : get-gl-rect ( enum -- value )
 431     4 get-gl-ints first4 [ 2array ] 2bi@ <rect> ;
 432
 433 : gl-enabled? ( enum -- ? )
 434     glIsEnabled c-bool> ;
 435
 436 PRIVATE>
 437
 438 : get-viewport-state ( -- viewport-state )
 439     GL_VIEWPORT get-gl-rect <viewport-state> ;
 440
 441 : get-scissor-state ( -- scissor-state )
 442     GL_SCISSOR_TEST get-gl-bool
 443     [ GL_SCISSOR_BOX get-gl-rect ] [ f ] if
 444     <scissor-state> ;
 445
 446 : get-multisample-state ( -- multisample-state )
 447     GL_MULTISAMPLE gl-enabled?
 448     GL_SAMPLE_ALPHA_TO_COVERAGE gl-enabled?
 449     GL_SAMPLE_ALPHA_TO_ONE gl-enabled?
 450     GL_SAMPLE_COVERAGE gl-enabled? [
 451         GL_SAMPLE_COVERAGE_VALUE get-gl-float
 452         GL_SAMPLE_COVERAGE_INVERT get-gl-bool
 453     ] [ f f ] if
 454     <multisample-state> ;
 455
 456 : get-stencil-state ( -- stencil-state )
 457     GL_STENCIL_TEST gl-enabled? [
 458         GL_STENCIL_REF get-gl-int
 459         GL_STENCIL_VALUE_MASK get-gl-int
 460         GL_STENCIL_FUNC get-gl-int gl-comparison>
 461         GL_STENCIL_FAIL get-gl-int gl-stencil-op>
 462         GL_STENCIL_PASS_DEPTH_FAIL get-gl-int gl-stencil-op>
 463         GL_STENCIL_PASS_DEPTH_PASS get-gl-int gl-stencil-op>
 464         <stencil-mode>
 465
 466         GL_STENCIL_BACK_REF get-gl-int
 467         GL_STENCIL_BACK_VALUE_MASK get-gl-int
 468         GL_STENCIL_BACK_FUNC get-gl-int gl-comparison>
 469         GL_STENCIL_BACK_FAIL get-gl-int gl-stencil-op>
 470         GL_STENCIL_BACK_PASS_DEPTH_FAIL get-gl-int gl-stencil-op>
 471         GL_STENCIL_BACK_PASS_DEPTH_PASS get-gl-int gl-stencil-op>
 472         <stencil-mode>
 473     ] [ f f ] if
 474     <stencil-state> ;
 475
 476 : get-depth-range-state ( -- depth-range-state )
 477     GL_DEPTH_RANGE 2 get-gl-floats first2 <depth-range-state> ;
 478
 479 : get-depth-state ( -- depth-state )
 480     GL_DEPTH_TEST gl-enabled?
 481     [ GL_DEPTH_FUNC get-gl-int gl-comparison> ] [ f ] if
 482     <depth-state> ;
 483
 484 : get-blend-state ( -- blend-state )
 485     GL_BLEND gl-enabled? [
 486         GL_BLEND_COLOR 4 get-gl-floats
 487
 488         GL_BLEND_EQUATION_RGB get-gl-int gl-blend-equation>
 489         GL_BLEND_SRC_RGB get-gl-int gl-blend-function>
 490         GL_BLEND_DST_RGB get-gl-int gl-blend-function>
 491         <blend-mode>
 492
 493         GL_BLEND_EQUATION_ALPHA get-gl-int gl-blend-equation>
 494         GL_BLEND_SRC_ALPHA get-gl-int gl-blend-function>
 495         GL_BLEND_DST_ALPHA get-gl-int gl-blend-function>
 496         <blend-mode>
 497     ] [ f f f ] if
 498     <blend-state> ;
 499
 500 : get-mask-state ( -- mask-state )
 501     GL_COLOR_WRITEMASK 4 get-gl-bools
 502     GL_DEPTH_WRITEMASK get-gl-bool
 503     GL_STENCIL_WRITEMASK get-gl-int
 504     GL_STENCIL_BACK_WRITEMASK get-gl-int
 505     <mask-state> ;
 506
 507 : get-triangle-cull-state ( -- triangle-cull-state )
 508     GL_FRONT_FACE get-gl-int gl-triangle-face>
 509     GL_CULL_FACE gl-enabled?
 510     [ GL_CULL_FACE_MODE get-gl-int gl-triangle-cull> ]
 511     [ f ] if
 512     <triangle-cull-state> ;
 513
 514 : get-triangle-state ( -- triangle-state )
 515     GL_POLYGON_MODE 2 get-gl-ints
 516     first2 [ gl-triangle-mode> ] bi@
 517     GL_POLYGON_SMOOTH gl-enabled?
 518     <triangle-state> ;
 519
 520 : get-point-state ( -- point-state )
 521     GL_VERTEX_PROGRAM_POINT_SIZE gl-enabled?
 522     [ f ] [ GL_POINT_SIZE get-gl-float ] if
 523     GL_POINT_SPRITE_COORD_ORIGIN get-gl-int gl-point-sprite-origin>
 524     GL_POINT_FADE_THRESHOLD_SIZE get-gl-float
 525     <point-state> ;
 526
 527 : get-line-state ( -- line-state )
 528     GL_LINE_WIDTH get-gl-float
 529     GL_LINE_SMOOTH gl-enabled?
 530     <line-state> ;