WebGl Fragment Shader pass array
我对OpenGL或WebGL知之甚少。 我想知道是否可以向片段着色器传递参数。 具体来说，我想将其传递给多维数组，并为每个像素设置颜色，例如：
1 | [0][0][0] = 1 |
将是(0，0)处像素的红色分量。
执行此操作的标准方法是使用纹理而不是传递数组。
西蒙的答案是正确的。 但是我花了大约6个小时才真正开始工作，这是我完整的工作代码(HTML文件)。 希望它将使您免于我今晚经历的所有麻烦。
使用方法：在画布上单击任意位置以设置或删除图块。
在以下环境中测试：Chrome，IE，Edge：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 | <!DOCTYPE HTML > <html lang="en"> <head> <meta charset="UTF-8"> TEXTURE AS TILEMAP <!-- AUTHOR: John Mark Isaac Madison --> <!-- EMAIL : J4M4I5M7@hotmail.com --> <!-- SSSSSSSSS SHADER_SECTION START SSSSSSSSS --> <!-- SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS --> <!-- SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS --> <style> p{ font-size:12pt;} h3,p,input,button,br{ padding:0px; margin:0px; font-family:"Andale Mono"; } button,input{ padding:10px; } </style> <script id="VERT_SHADER" type="NOT_JAVASCRIPT"> precision highp float; attribute vec2 a_position; void main() { gl_Position = vec4(a_position, 0, 1); } <!-- Simpler shader for when you need to --> <!-- simplify and hunt down a problem --> <script id="FRAG_SHADER_SIMPLE" type="NOT_JAVASCRIPT"> #ifdef GL_FRAGMENT_PRECISION_HIGH precision highp float; precision highp int; #else precision mediump float; precision mediump int; #endif uniform int HAS_TEXTURE_BEEN_PUSHED_FROM_JAVASCRIPT; uniform sampler2D u_texture; //<--"uSampler" here: https://www.john-smith.me/hassles-with-array-access-in-webgl-and-a-couple-of-workarounds.html void main(){ gl_FragColor = vec4( 0.5, 0.5, 0.5, 1.0); } <script id="FRAG_SHADER" type="NOT_JAVASCRIPT"> //Must declare precision before declaring //any uniforms: //////////////////////////////////////////////// #ifdef GL_FRAGMENT_PRECISION_HIGH precision highp float; precision highp int; #else precision mediump float; precision mediump int; #endif //////////////////////////////////////////////// //:Width and height of tilemap in TILES: uniform int CMAP_WID; uniform int CMAP_HIG; //SOURCE: https://stackoverflow.com/questions/36324295/webgl-access-buffer-from-shader //: QUOTE[ //: Make sure your texture filtering //: is set to gl.NEAREST. //: ]QUOTE //SDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSD// uniform int HAS_TEXTURE_BEEN_PUSHED_FROM_JAVASCRIPT; uniform sampler2D u_texture; //<--"uSampler" here: https://www.john-smith.me/hassles-with-array-access-in-webgl-and-a-couple-of-workarounds.html vec2 textureSize = vec2(128.0, 128.0); vec4 getValueFromTexture(float index) { float column = mod(index, textureSize.x); float row = floor(index / textureSize.x); vec2 uv = vec2( (column + 0.5) / textureSize.x, (row + 0.5) / textureSize.y); return texture2D(u_texture, uv); } //Integer version of function: vec4 TVi( int index_i ){ return getValueFromTexture( float(index_i) ); } //SDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSDSD// #define CANVAS_WID 640.0 #define CANVAS_HIG 480.0 #define TIL_WID 64.0 #define TIL_HIG 64.0 //Uniforms exposed to HTML/JAVASCRIPT: uniform float TIL_WID_EDIT; uniform float TIL_HIG_EDIT; //Time modulates between 0 and 1: uniform float TIME_TICKER; //Matches iTime of shadertoy website; uniform float TIME_UPUP; //Hard code to support a 16x16 tilemap: uniform float TIL_MAP[256]; //uniform float TIL_MAP[8]; float til_wid; float til_hig; //TFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTFTF// vec2 RenderTileBase(){ vec2 OUT_DATA; //Don't render until tile-map size in tiles //has been set by javascript: if(CMAP_WID == 0){ return OUT_DATA; } if(CMAP_HIG == 0){ return OUT_DATA; } //If uniforms have not set by user, //use the default values set by the #define(s) //==========================================// if(TIL_WID_EDIT > 0.0){ til_wid = TIL_WID_EDIT; }else{ til_wid = TIL_WID; } if(TIL_HIG_EDIT > 0.0){ til_hig = TIL_HIG_EDIT; }else{ til_hig = TIL_HIG; } //==========================================// //NOTE: on"gl_FragCoord" range: //******************************************// //web-gl: In terms of pixel/canvas coords. // X-AXIS: 0 to canvas.width - 1 // Y-AXIS: 0 to canvas.height- 1 //OpenGL: In terms of 0 to 1. //******************************************// //:Calculate number of tiles shown on screen: //:This may be fractional: float NUM_TIL_X = CANVAS_WID / til_wid; float NUM_TIL_Y = CANVAS_HIG / til_hig; //DETERMINE WHAT tile you are on: float TC_X; //tile coordinate X float TC_Y; //tile coordinate Y TC_X = floor( gl_FragCoord.x / til_wid ); TC_Y = floor( gl_FragCoord.y / til_hig ); int i_X = int( TC_X ); //integer version of TC_X int i_Y = int( TC_Y ); //integer version of TC_Y int DEX = (i_Y * CMAP_WID) + i_X; vec2 FC_MOD; FC_MOD.x = gl_FragCoord.x; FC_MOD.y = gl_FragCoord.y; //You want all tiles to have the full range //of colors, so you always modulate by //CANVAS_WID and CANVAS_HIG, You scale by the //# of tiles on each axis which means the //gradient becomes steeper as the # of tiles //increases. FC_MOD.x = mod( gl_FragCoord.x*NUM_TIL_X, CANVAS_WID ); FC_MOD.y = mod( gl_FragCoord.y*NUM_TIL_Y, CANVAS_HIG ); //[N]ormalize values into range 0 to 1: //NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN// float norm_X = (FC_MOD.x) / CANVAS_WID; float norm_Y = (FC_MOD.y) / CANVAS_HIG; float NMAP_X; // norm_X value mapped. float NMAP_Y; // norm_Y value mapped. //NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN// //Use [B]lue channel because why not? //BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB// float GRAD_X = gl_FragCoord.x / CANVAS_WID; float GRAD_Y = gl_FragCoord.y / CANVAS_HIG; if(GRAD_X > 1.0 || GRAD_X < 0.0){ return OUT_DATA; } if(GRAD_Y > 1.0 || GRAD_Y < 0.0){ return OUT_DATA; } float tile_value; float DEX_F = float(DEX); vec4 V4 ; //tile_RGBA if( HAS_TEXTURE_BEEN_PUSHED_FROM_JAVASCRIPT > 0 ){ V4 = getValueFromTexture( DEX_F ); tile_value = V4.x; } if( tile_value==0.0 ){ NMAP_X = 0.0; NMAP_Y = 0.0; }else{ NMAP_X = TIME_TICKER; NMAP_Y = 1.0-TIME_TICKER; } //BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB// OUT_DATA.x = NMAP_X; OUT_DATA.y = NMAP_Y; return OUT_DATA; } void main() { vec2 uv = RenderTileBase(); gl_FragColor = vec4( uv.x, uv.y, 0, 1.0); return; } <!-- SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS --> <!-- SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS --> <!-- SSSSSSSSSS SHADER_SECTION END SSSSSSSSSS --> <!-- SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS --> <script id="BOILER_PLATE_CODE" type="text/javascript"> function ON_LOADED_FUNCTION(){ console.log("[ON_LOADED_FUNCTION]"); main(); } //SOURCE:https://www.john-smith.me/hassles-with-array-access-in-webgl-and-a-couple-of-workarounds.html var HACK_CANVAS = document.createElement('canvas'); HACK_CANVAS.width = 128*128; HACK_CANVAS.height= 1; //Global Array Container: var GLOBAL_GAC; var TIME_UPUP = 0; var TIME_0255 = 0; var TIME_2PI = 0.0; var TIME_TICKER = 0.0; function UPDATE_TIMER(){ TIME_UPUP = TIME_UPUP + 0.01; TIME_0255 += 0.75; if(TIME_0255 > 255){ TIME_0255 = 0; } TIME_2PI = (TIME_0255 / 255) * (Math.PI * 2); //Use cos to modulate value between 0 and 1: //To do so, need to offset by 1 and divide //by two to transform [-1, 1] range //into [0, 1] range. TIME_TICKER = ( Math.cos(TIME_2PI) + 1) / 2; //console.log( TIME_TICKER); SET_ATTR("TIME_TICKER", TIME_TICKER); SET_ATTR("TIME_UPUP" , TIME_UPUP ); } //:Takes the gl context object, if the input //:is null, we likely failed to get the //:context. function HAS_OPEN_GL_CHECK(gl){ // Only continue if WebGL is // available and working if (!gl) { var msg =""; msg +="[Unable to initialize WebGL.]"; msg +="[your browser or machine may]"; msg += "[not support it.]" alert( msg ); return; } } function GET_INPUT_BOX_VALUE( elem_id ){ var box; //DOM input box var val; //Value in input box. box = document.getElementById( elem_id ); val = box.value; return (0 + val); //cast to number. } function PUT_WID(){ assert_program_and_gl_exist(); var val = GET_INPUT_BOX_VALUE("INPUT_WID"); var res = SET_ATTR_UI("TIL_WID_EDIT", val); //For click listener on canvas: if(res){ GLOBAL_TIL_WID = val; } } function PUT_HIG(){ assert_program_and_gl_exist(); var val = GET_INPUT_BOX_VALUE("INPUT_HIG"); var res = SET_ATTR_UI("TIL_HIG_EDIT", val); //For click listener on canvas: if(res){ GLOBAL_TIL_HIG = val; } } //Integer Version of set-attribute helper: function SET_ATTR_INT(gl_var_name, val){ var loc; //<--location of variable loc = gl.getUniformLocation( program, gl_var_name ); gl.useProgram(program); gl.uniform1i(loc, val ); } //Returns TRUE if successful: function SET_ATTR(gl_var_name, val){ var loc; //<--location of variable. loc = gl.getUniformLocation( program , gl_var_name ); gl.useProgram(program); gl.uniform1f(loc, val); return true; } //Version of SET_ATTR used for the //User Interface (UI): function SET_ATTR_UI(gl_var_name, val){ if(val < 0 || val > 256 ){ alert("choose value between 0 to 256"); //Call was ignored, so return false: return false; } return SET_ATTR(gl_var_name, val); } function assert_program_and_gl_exist(){ if(!program){慌("[NO_PROGRAM_EXISTS]");} if(!gl ){慌("[NO_GL_EXISTS]");} } //慌:"disconcerted, be confused, lose one's head" //慌: In Code: ~Panic~ function 慌( panic_message ){ console.log( panic_message ); alert ( panic_message ); throw ( panic_message ); } function makeOpenGlContextUsingCanvas(c){ //:Try what works in chrome and all the //:respectable browsers first: gl = c.getContext("webgl"); if(!gl){ console.log("[Probably_In_IE]"); gl = c.getContext("experimental-webgl"); }else{ console.log("[Probably_NOT_IE]"); } HAS_OPEN_GL_CHECK( gl ); return gl; } function CANVAS_CLICK_FUNCTION(event){ var mp = getMousePos(canvas,event); //Correct to match openGL orientation: mp.y = canvas.height - mp.y; console.log( mp ); //Determine tile clicked on: var tx = mp.x / GLOBAL_TIL_WID; var ty = mp.y / GLOBAL_TIL_HIG; tx = Math.floor(tx); ty = Math.floor(ty); console.log("tx:", tx,"ty:", ty); //Convert to index: var dex; dex = (GLOBAL_GAC.WID * ty) + tx; val = GLOBAL_GAC.Get_R( dex ); if(val!=0){ val = 0; }else{ val = 1; } GLOBAL_GAC.Put_R( dex , val ); //Update The Shader With New TileMap: GLOBAL_GAC.pushToGL(); } function getMousePos(GMP_canvas, evt) { var rect = GMP_canvas.getBoundingClientRect(); return { x: evt.clientX - rect.left, y: evt.clientY - rect.top }; } //: No"var" prefix, making them global: function initGlobals(){ //The width and height in PIXELS of a //single tile on our tile-map: GLOBAL_TIL_WID = 64; GLOBAL_TIL_HIG = 64; canvas = document.querySelector("#glCanvas"); if(!canvas){ alert("FAILED_TO_GET_CANVAS"); }else{ console.log("[GOT_CANVAS]"); } //Add listener to canvas: canvas.addEventListener('click',CANVAS_CLICK_FUNCTION); gl = makeOpenGlContextUsingCanvas(canvas); //These dimensions are hard-coded into //fragment shader code, so be careful //about changing them: canvas.width = 640; canvas.height= 480; buffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, buffer); gl.bufferData( gl.ARRAY_BUFFER, new Float32Array([ -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0]), gl.STATIC_DRAW ); //G == Global Container. //To fix problems with rendering in I.E. //(Internet Explorer) //GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG// var G = {}; G.canvas = canvas; G.gl = gl; G.buffer = buffer; if( ! G.canvas || ! G.gl || ! G.buffer ){ 慌("[Global_Container_Broken]"); } return G; //GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG// } function main(){ G = initGlobals(); HAS_OPEN_GL_CHECK( G ); gl.viewport(0,0,gl.drawingBufferWidth , gl.drawingBufferHeight); setup(); render(); SETUP_TILE_MAP_DATA(); } //Need texture/buffer container: 斗 var GLArrayContainer = function(){ var _self = this; //web-gl texture handle: this.TEX = null; //Pixel Array: this.PIX = null; //Number of pixels in Pixel Array: this.PIX_NUM = 0; this.WID = 0; //width in pixels. this.HIG = 0; //height in pixels. Sure pixels? //Publically Exposed Functions: //PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP// this.setPixelByIndex = _setPixelByIndex; this.makePattern = _makePattern ; this.solidFill = _solidFill ; this.pushToGL = _pushToGL ; this.Get_R = _get_R; this.Put_R = _put_R; //PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP// //: i == index. function _get_R( i ){ var RED_INDEX = 0; var r = _self.PIX[(i*4) + RED_INDEX]; return r; } //: i == index. function _put_R( i, val){ var RED_INDEX = 0; _self.PIX[(i*4) + RED_INDEX] = val; } function _setPixelByIndex(i, r,g,b, a){ //Multiply by 4 to get address //of first component of pixel [i] //Because each pixel is 4-bytes: var b = i*4; //RGBA (alpha last) (NOT : argb) _self.PIX[ b + 0 ] = r; _self.PIX[ b + 1 ] = g; _self.PIX[ b + 2 ] = b; _self.PIX[ b + 3 ] = a; } function _solidFill(){ if(_self.PIX_NUM <= 0){慌("[BAD_PIX_NUM]");} var r,g,b; for(var i = 0; i < _self.PIX_NUM; i++){ _setPixelByIndex(i,225,22,64,255); } } //Make a checker pattern: function _makePattern(){ var EVERY_OTHER = false; var i_r = 0; var i_g = 0; var i_b = 0; for(var i = 0; i < _self.PIX_NUM; i++){ EVERY_OTHER = (!EVERY_OTHER); if( EVERY_OTHER ){ i_r = 255; i_g = 255; i_b = 255; }else{ //alert("HEY"); i_r = 0; i_g = 0; i_b = 0; } _setPixelByIndex( i,i_r,i_g,i_b,255 ); } } //Push changes to Web-GL so fragment //shader can use the values: function _pushToGL(){ if(!_self.TEX){慌("[TEX_PROBLEM]");} console.log("[push_to_gl]"); gl.activeTexture( gl.TEXTURE1 ); gl.bindTexture( gl.TEXTURE_2D, _self.TEX ); //Will get error: //[ WebGL: INVALID_OPERATION: ] //[ texParameter: no texture bound to target ] //If no texture is bound to active slot before doing this. //:SOURCE:https://stackoverflow.com/questions/42358462/no-texture-bound-to-the-unit-0 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE); //:will also throw error if no texture //in active texture slot: gl.texImage2D( gl.TEXTURE_2D , 0 , //LEVEL gl.RGBA , //internalFormat, _self.WID , _self.HIG , 0 , //border gl.RGBA , //srcFormat gl.UNSIGNED_BYTE , //srcType _self.PIX //<--ArrayBufferView object ); SET_ATTR_INT( "HAS_TEXTURE_BEEN_PUSHED_FROM_JAVASCRIPT", 1 ); //Let shader know tile-map width and height: SET_ATTR_INT("CMAP_WID", _self.WID); SET_ATTR_INT("CMAP_HIG", _self.HIG); } } TILE_MAP_HAS_BEEN_SETUP = false; function SETUP_TILE_MAP_DATA(){ if(TILE_MAP_HAS_BEEN_SETUP){ alert("[MAP_ALREADY_SETUP]"); return; } TILE_MAP_HAS_BEEN_SETUP = true; //Decided on 128x128: //Because it is maximum dimensions of //a project I am working on. const WID = 128; const HIG = 128; //4 components/bytes in 1 ARGB pixel: const NUM_COM_ARGB = 4; //4; const ARRAY_LENGTH = WID*HIG*NUM_COM_ARGB; const pixel = new Uint8Array( ARRAY_LENGTH ); //Create Texure slot at TEXTURE1 because //seems to be bug"there is no texture bound to unit 0" //in chrome. gl.activeTexture(gl.TEXTURE1); const texture = gl.createTexture(); if(!texture){慌("[NOT_TEXTURE]");} //Our texture sampler needs to be bound to //the same texture slot. Hence the"1" //https://www.john-smith.me/hassles-with-array-access-in-webgl-and-a-couple-of-workarounds.html gl.uniform1i( gl.getUniformLocation( program , "u_texture" //<--Sampler2D's Name. ), 1 //<--Texture Slot To Bind To. ); //Our pixel array is 4-component, so we //can use alignment 4. An alignment of //1 will also work. //SOURCE: https://webglfundamentals.org/webgl/lessons/webgl-data-textures.html const alignment = 4; gl.pixelStorei(gl.UNPACK_ALIGNMENT, alignment); //Populate our helper container: //PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP// GLOBAL_GAC = new GLArrayContainer(); GLOBAL_GAC.PIX = pixel; GLOBAL_GAC.TEX = texture; GLOBAL_GAC.PIX_NUM = WID*HIG; GLOBAL_GAC.WID = WID; GLOBAL_GAC.HIG = HIG; GLOBAL_GAC.makePattern(); GLOBAL_GAC.pushToGL(); //setTimeout( 1, GLOBAL_GAC.pushToGL() ); //PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP// } function setup(){ var frag_dom = document.getElementById("FRAG_SHADER"); var frag_src = frag_dom.text; console.log( frag_src ); F = createShader( gl,gl.FRAGMENT_SHADER, frag_src ); var vert_dom = document.getElementById("VERT_SHADER"); var vert_src = vert_dom.text; console.log( vert_src ); V = createShader( gl, gl.VERTEX_SHADER, vert_src ); //**** MAKE"program" a GLOBAL VAR ****// program = createProgram(gl,V,F); gl.useProgram( program ); if(!program){ 慌("[PROGRAM_IS_NULL]");} } function render(){ window.requestAnimationFrame(render,canvas); // Set clear color to black, fully opaque gl.clearColor(0.0, 0.0, 0.5, 1.0); // Clear the color buffer with specified clear color gl.clear(gl.COLOR_BUFFER_BIT); //Directly before call to gl.drawArrays: positionLocation = gl.getAttribLocation(program,"a_position"); gl.enableVertexAttribArray( positionLocation ); gl.vertexAttribPointer(positionLocation, 2, gl.FLOAT, false, 0, 0); UPDATE_TIMER(); gl.drawArrays(gl.TRIANGLES, 0, 6); } function createShader(gl,type,source){ //:Error Check For Bad Inputs: if(!gl ){慌("[NULL_GL]");} if(!type ){慌("[NULL_TY]");} if(!source){慌("[NULL_SR]");} var shader = gl.createShader(type); gl.shaderSource(shader, source); gl.compileShader(shader); var res = gl.getShaderParameter(shader, gl.COMPILE_STATUS); if( res ){ console.log("[SHADER_COMPILED!]"); return shader; } console.log(gl.getShaderInfoLog(shader)); gl.deleteShader(shader); 慌("[FAILED_TO_COMPILE_SHADER]"); } //:gl : openGL context : //:vert: vertex shader : //:frag: fragment shader: function createProgram(gl,vert, frag){ var program = gl.createProgram(); gl.attachShader(program, vert); gl.attachShader(program, frag); gl.linkProgram (program); var res = gl.getProgramParameter(program, gl.LINK_STATUS); if( res ){ console.log("[PROGRAM_CREATED!]"); return program; } console.log(gl.getProgramInfoLog(program)); gl.deleteProgram(program); } <!-- SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS --> </head> <!-- HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH --> <!-- BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB --> <body onloadx="ON_LOADED_FUNCTION()"> <!-- BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB --> Web-GL: Texture As Tilemap <p> Author: John Mark Isaac Madison <p><center>[wp_ad_camp_3]</center></p><p> <p> Email : J4M4I5M7@hotmail.com <p> <canvas id="glCanvas"></canvas> </br> <button onClick="PUT_WID();">TILE_WIDTH__IN_PIXELS</button> <input type="text" id="INPUT_WID" value="32"> </br> </br> <button onClick="PUT_HIG();">TILE_HEIGHT_IN_PIXELS</button> <input type="text" id="INPUT_HIG" value="32"> </br> <!-- BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB --> </body> </html> |