webgl-tools

annotate sanegl.js @ 0:4fe036e28796

find changesets by author, revision, files, or words in the commit message
initial commit
author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 15 Jun 2011 20:04:49 +0300
parents
children 9eb4c37ce415
rev   line source
nuclear@0 1 /*
nuclear@0 2 SaneGL - a small library to bring back sanity to WebGL
nuclear@0 3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@0 4
nuclear@0 5 This program is free software: you can redistribute it and/or modify
nuclear@0 6 it under the terms of the GNU General Public License as published by
nuclear@0 7 the Free Software Foundation, either version 3 of the License, or
nuclear@0 8 (at your option) any later version.
nuclear@0 9
nuclear@0 10 This program is distributed in the hope that it will be useful,
nuclear@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@0 13 GNU General Public License for more details.
nuclear@0 14
nuclear@0 15 You should have received a copy of the GNU General Public License
nuclear@0 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@0 17 */
nuclear@0 18 const GL_MODELVIEW = 0;
nuclear@0 19 const GL_PROJECTION = 1;
nuclear@0 20 const GL_TEXTURE = 2;
nuclear@0 21
nuclear@0 22 const GL_POINTS = 1;
nuclear@0 23 const GL_LINES = 2;
nuclear@0 24 const GL_TRIANGLES = 3;
nuclear@0 25 const GL_QUADS = 4;
nuclear@0 26
nuclear@0 27 var gl_ident_val = [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
nuclear@0 28 var gl_mmode = GL_MODELVIEW;
nuclear@0 29 var gl_mat = new Array(
nuclear@0 30 [new Float32Array(gl_ident_val)],
nuclear@0 31 [new Float32Array(gl_ident_val)],
nuclear@0 32 [new Float32Array(gl_ident_val)]);
nuclear@0 33
nuclear@0 34 /* XXX change after debugging */
nuclear@0 35 const GL_MAX_VERTS = 32;
nuclear@0 36
nuclear@0 37 var gl_prim = 0;
nuclear@0 38 var gl_vbuf = null, gl_nbuf = null, gl_cbuf = null, gl_tbuf = null;
nuclear@0 39 var gl_vertex, gl_normal, gl_color, gl_texcoord;
nuclear@0 40 var gl_nverts, gl_vert_calls;
nuclear@0 41 var gl_curr_normal = new Float32Array(3);
nuclear@0 42 var gl_curr_color = new Float32Array(4);
nuclear@0 43 var gl_curr_texcoord = new Float32Array(2);
nuclear@0 44 var gl_vloc, gl_nloc, gl_cloc, gl_tloc;
nuclear@0 45 var gl_use_normal, gl_use_color, gl_use_texcoord;
nuclear@0 46
nuclear@0 47 function glMatrixMode(mode)
nuclear@0 48 {
nuclear@0 49 gl_mmode = mode;
nuclear@0 50 }
nuclear@0 51
nuclear@0 52 function glPushMatrix()
nuclear@0 53 {
nuclear@0 54 var mtop = gl_mat[gl_mmode].length - 1;
nuclear@0 55
nuclear@0 56 gl_mat[gl_mmode].push(new Float32Array(16));
nuclear@0 57 m4_copy(gl_mat[gl_mmode][mtop + 1], gl_mat[gl_mmode][mtop]);
nuclear@0 58 }
nuclear@0 59
nuclear@0 60 function glPopMatrix()
nuclear@0 61 {
nuclear@0 62 if(gl_mat[gl_mmode].length <= 1) {
nuclear@0 63 alert('glPopMatrix underflow');
nuclear@0 64 }
nuclear@0 65 gl_mat[gl_mmode].pop();
nuclear@0 66 }
nuclear@0 67
nuclear@0 68 function glLoadIdentity()
nuclear@0 69 {
nuclear@0 70 var mtop = gl_mat[gl_mmode].length - 1;
nuclear@0 71 m4_identity(gl_mat[gl_mmode][mtop]);
nuclear@0 72 }
nuclear@0 73
nuclear@0 74 function glLoadMatrixf(mat)
nuclear@0 75 {
nuclear@0 76 var mtop = gl_mat[gl_mmode].length - 1;
nuclear@0 77 m4_copy(gl_mat[gl_mmode][mtop], mat);
nuclear@0 78 }
nuclear@0 79
nuclear@0 80 function glMultMatrixf(mat)
nuclear@0 81 {
nuclear@0 82 var mtop = gl_mat[gl_mmode].length - 1;
nuclear@0 83 m4_mul(gl_mat[gl_mmode][mtop], gl_mat[gl_mmode][mtop], mat);
nuclear@0 84 }
nuclear@0 85
nuclear@0 86 function glTranslatef(x, y, z)
nuclear@0 87 {
nuclear@0 88 var xform = new Float32Array(16);
nuclear@0 89 m4_translation(xform, x, y, z);
nuclear@0 90 glMultMatrixf(xform);
nuclear@0 91 }
nuclear@0 92
nuclear@0 93 function glRotatef(angle, x, y, z)
nuclear@0 94 {
nuclear@0 95 var angle_rads = Math.PI * angle / 180.0;
nuclear@0 96 var xform = new Float32Array(16);
nuclear@0 97 m4_rotation(xform, angle_rads, x, y, z);
nuclear@0 98 glMultMatrixf(xform);
nuclear@0 99 }
nuclear@0 100
nuclear@0 101 function glScalef(x, y, z)
nuclear@0 102 {
nuclear@0 103 var xform = new Float32Array(16);
nuclear@0 104 m4_scale(xform, x, y, z);
nuclear@0 105 glMultMatrixf(xform);
nuclear@0 106 }
nuclear@0 107
nuclear@0 108 function glOrtho(left, right, bottom, top, near, far)
nuclear@0 109 {
nuclear@0 110 var dx = right - left;
nuclear@0 111 var dy = top - bottom;
nuclear@0 112 var dz = far - near;
nuclear@0 113
nuclear@0 114 var tx = -(right + left) / dx;
nuclear@0 115 var ty = -(top + bottom) / dy;
nuclear@0 116 var tz = -(far + near) / dz;
nuclear@0 117
nuclear@0 118 var sx = 2.0 / dx;
nuclear@0 119 var sy = 2.0 / dy;
nuclear@0 120 var sz = -2.0 / dz;
nuclear@0 121
nuclear@0 122 var xform = new Float32Array(16);
nuclear@0 123 xform[0] = sx;
nuclear@0 124 xform[5] = sy;
nuclear@0 125 xform[10] = sz;
nuclear@0 126 xform[12] = tx;
nuclear@0 127 xform[13] = ty;
nuclear@0 128 xform[14] = tz;
nuclear@0 129 xform[15] = 1.0;
nuclear@0 130 xform[1] = xform[2] = xform[3] = xform[4] = xform[6] = xform[7] = xform[8] = xform[9] = 0.0;
nuclear@0 131
nuclear@0 132 glMultMatrixf(xform);
nuclear@0 133 }
nuclear@0 134
nuclear@0 135 function glFrustum(left, right, bottom, top, near, far)
nuclear@0 136 {
nuclear@0 137 var dx = right - left;
nuclear@0 138 var dy = top - bottom;
nuclear@0 139 var dz = far - near;
nuclear@0 140
nuclear@0 141 var a = (right + left) / dx;
nuclear@0 142 var b = (top + bottom) / dy;
nuclear@0 143 var c = -(far + near) / dz;
nuclear@0 144 var d = -2.0 * far * near / dz;
nuclear@0 145
nuclear@0 146 var xform = new Float32Array(16);
nuclear@0 147 xform[0] = 2.0 * near / dx;
nuclear@0 148 xform[5] = 2.0 * near / dy;
nuclear@0 149 xform[8] = a;
nuclear@0 150 xform[9] = b;
nuclear@0 151 xform[10] = c;
nuclear@0 152 xform[11] = -1.0;
nuclear@0 153 xform[14] = d;
nuclear@0 154 xform[1] = xform[2] = xform[3] = xform[4] = xform[6] = xform[7] = xform[12] = xform[13] = xform[15] = 0.0;
nuclear@0 155
nuclear@0 156 glMultMatrixf(xform);
nuclear@0 157 }
nuclear@0 158
nuclear@0 159 function gl_apply_xform(prog)
nuclear@0 160 {
nuclear@0 161 var mvtop = gl_mat[GL_MODELVIEW].length - 1;
nuclear@0 162 var ptop = gl_mat[GL_PROJECTION].length - 1;
nuclear@0 163 var ttop = gl_mat[GL_TEXTURE].length - 1;
nuclear@0 164
nuclear@0 165 var loc = gl.getUniformLocation(prog, "mvmat");
nuclear@0 166 if(loc != -1) {
nuclear@0 167 gl.uniformMatrix4fv(loc, gl.FALSE, gl_mat[GL_MODELVIEW][mvtop]);
nuclear@0 168 }
nuclear@0 169
nuclear@0 170 loc = gl.getUniformLocation(prog, "projmat");
nuclear@0 171 if(loc != -1) {
nuclear@0 172 gl.uniformMatrix4fv(loc, gl.FALSE, gl_mat[GL_PROJECTION][ptop]);
nuclear@0 173 }
nuclear@0 174
nuclear@0 175 loc = gl.getUniformLocation(prog, "texmat");
nuclear@0 176 if(loc != -1) {
nuclear@0 177 gl.uniformMatrix4fv(loc, gl.FALSE, gl_mat[GL_TEXTURE][ttop]);
nuclear@0 178 }
nuclear@0 179 }
nuclear@0 180
nuclear@0 181 function glBegin(prim)
nuclear@0 182 {
nuclear@0 183 gl_vertex = new Float32Array(GL_MAX_VERTS * 4);
nuclear@0 184 gl_normal = new Float32Array(GL_MAX_VERTS * 3);
nuclear@0 185 gl_color = new Float32Array(GL_MAX_VERTS * 4);
nuclear@0 186 gl_texcoord = new Float32Array(GL_MAX_VERTS * 4);
nuclear@0 187
nuclear@0 188 if(gl_vbuf == null) {
nuclear@0 189 gl_vbuf = gl.createBuffer();
nuclear@0 190 gl.bindBuffer(gl.ARRAY_BUFFER, gl_vbuf);
nuclear@0 191 gl.bufferData(gl.ARRAY_BUFFER, GL_MAX_VERTS * 4 * Float32Array.BYTES_PER_ELEMENT, gl.STREAM_DRAW);
nuclear@0 192 logmsg("vertex buffer size: " + gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE) + "\n");
nuclear@0 193
nuclear@0 194 gl_nbuf = gl.createBuffer();
nuclear@0 195 gl.bindBuffer(gl.ARRAY_BUFFER, gl_nbuf);
nuclear@0 196 gl.bufferData(gl.ARRAY_BUFFER, GL_MAX_VERTS * 3 * Float32Array.BYTES_PER_ELEMENT, gl.STREAM_DRAW);
nuclear@0 197 logmsg("normal buffer size: " + gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE) + "\n");
nuclear@0 198
nuclear@0 199 gl_cbuf = gl.createBuffer();
nuclear@0 200 gl.bindBuffer(gl.ARRAY_BUFFER, gl_cbuf);
nuclear@0 201 gl.bufferData(gl.ARRAY_BUFFER, GL_MAX_VERTS * 4 * Float32Array.BYTES_PER_ELEMENT, gl.STREAM_DRAW);
nuclear@0 202 logmsg("color buffer size: " + gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE) + "\n");
nuclear@0 203
nuclear@0 204 gl_tbuf = gl.createBuffer();
nuclear@0 205 gl.bindBuffer(gl.ARRAY_BUFFER, gl_tbuf);
nuclear@0 206 gl.bufferData(gl.ARRAY_BUFFER, GL_MAX_VERTS * 4 * Float32Array.BYTES_PER_ELEMENT, gl.STREAM_DRAW);
nuclear@0 207 logmsg("texcoord buffer size: " + gl.getBufferParameter(gl.ARRAY_BUFFER, gl.BUFFER_SIZE) + "\n");
nuclear@0 208 }
nuclear@0 209
nuclear@0 210 gl_prim = prim;
nuclear@0 211 gl_nverts = gl_vert_calls = 0;
nuclear@0 212
nuclear@0 213 gl_prog = gl.getParameter(gl.CURRENT_PROGRAM);
nuclear@0 214 if(gl_prog != null) {
nuclear@0 215 gl_apply_xform(gl_prog);
nuclear@0 216
nuclear@0 217 gl_vloc = gl.getAttribLocation(gl_prog, "attr_vertex");
nuclear@0 218 gl_nloc = gl.getAttribLocation(gl_prog, "attr_normal");
nuclear@0 219 gl_cloc = gl.getAttribLocation(gl_prog, "attr_color");
nuclear@0 220 gl_tloc = gl.getAttribLocation(gl_prog, "attr_texcoord");
nuclear@0 221 } else {
nuclear@0 222 logmsg("no program currently bound\n");
nuclear@0 223 gl_vloc = gl_nloc = gl_cloc = gl_tloc = -1;
nuclear@0 224 }
nuclear@0 225
nuclear@0 226 if(gl_vloc == -1) {
nuclear@0 227 logmsg("attr_vertex not found in currently bound program: " + prog + "\n");
nuclear@0 228 }
nuclear@0 229
nuclear@0 230 gl_use_normal = gl_nloc != -1;
nuclear@0 231 gl_use_color = gl_cloc != -1;
nuclear@0 232 gl_use_texcoord = gl_tloc != -1;
nuclear@0 233 }
nuclear@0 234
nuclear@0 235 function glEnd()
nuclear@0 236 {
nuclear@0 237 if(gl_nverts > 0) {
nuclear@0 238 gl_draw_immediate();
nuclear@0 239 }
nuclear@0 240 }
nuclear@0 241
nuclear@0 242 function gl_draw_immediate()
nuclear@0 243 {
nuclear@0 244 var gles_prim;
nuclear@0 245
nuclear@0 246 if(gl_vloc == -1) {
nuclear@0 247 return;
nuclear@0 248 }
nuclear@0 249
nuclear@0 250 switch(gl_prim) {
nuclear@0 251 case GL_POINTS:
nuclear@0 252 gles_prim = gl.POINTS;
nuclear@0 253 break;
nuclear@0 254 case GL_LINES:
nuclear@0 255 gles_prim = gl.LINES;
nuclear@0 256 break;
nuclear@0 257 case GL_TRIANGLES:
nuclear@0 258 case GL_QUADS:
nuclear@0 259 gles_prim = gl.TRIANGLES;
nuclear@0 260 break;
nuclear@0 261 default:
nuclear@0 262 }
nuclear@0 263
nuclear@0 264 gl.bindBuffer(gl.ARRAY_BUFFER, gl_vbuf);
nuclear@0 265 gl.bufferSubData(gl.ARRAY_BUFFER, 0, gl_vertex);
nuclear@0 266 gl.vertexAttribPointer(gl_vloc, 4, gl.FLOAT, false, 0, 0);
nuclear@0 267 gl.enableVertexAttribArray(gl_vloc);
nuclear@0 268
nuclear@0 269 if(gl_use_normal) {
nuclear@0 270 gl.bindBuffer(gl.ARRAY_BUFFER, gl_nbuf);
nuclear@0 271 gl.bufferSubData(gl.ARRAY_BUFFER, 0, gl_normal);
nuclear@0 272 gl.vertexAttribPointer(gl_nloc, 3, gl.FLOAT, false, 0, 0);
nuclear@0 273 gl.enableVertexAttribArray(gl_nloc);
nuclear@0 274 }
nuclear@0 275
nuclear@0 276 if(gl_use_color) {
nuclear@0 277 gl.bindBuffer(gl.ARRAY_BUFFER, gl_cbuf);
nuclear@0 278 gl.bufferSubData(gl.ARRAY_BUFFER, 0, gl_color);
nuclear@0 279 gl.vertexAttribPointer(gl_cloc, 4, gl.FLOAT, true, 0, 0);
nuclear@0 280 gl.enableVertexAttribArray(gl_cloc);
nuclear@0 281 }
nuclear@0 282
nuclear@0 283 if(gl_use_texcoord) {
nuclear@0 284 gl.bindBuffer(gl.ARRAY_BUFFER, gl_tbuf);
nuclear@0 285 gl.bufferSubData(gl.ARRAY_BUFFER, 0, gl_texcoord);
nuclear@0 286 gl.vertexAttribPointer(gl_tloc, 4, gl.FLOAT, false, 0, 0);
nuclear@0 287 gl.enableVertexAttribArray(gl_tloc);
nuclear@0 288 }
nuclear@0 289
nuclear@0 290 gl.drawArrays(gles_prim, 0, gl_nverts);
nuclear@0 291
nuclear@0 292 gl.disableVertexAttribArray(gl_vloc);
nuclear@0 293 if(gl_use_normal) {
nuclear@0 294 gl.disableVertexAttribArray(gl_nloc);
nuclear@0 295 }
nuclear@0 296 if(gl_use_color) {
nuclear@0 297 gl.disableVertexAttribArray(gl_cloc);
nuclear@0 298 }
nuclear@0 299 if(gl_use_texcoord) {
nuclear@0 300 gl.disableVertexAttribArray(gl_tloc);
nuclear@0 301 }
nuclear@0 302 }
nuclear@0 303
nuclear@0 304
nuclear@0 305 function glVertex2f(x, y)
nuclear@0 306 {
nuclear@0 307 glVertex3f(x, y, 0.0);
nuclear@0 308 }
nuclear@0 309
nuclear@0 310 function glVertex3f(x, y, z)
nuclear@0 311 {
nuclear@0 312 var i = 0;
nuclear@0 313 var vidx = gl_nverts * 4;
nuclear@0 314 var nidx = gl_nverts * 3;
nuclear@0 315
nuclear@0 316 if(gl_prim == GL_QUADS && gl_vert_calls % 4 == 3) {
nuclear@0 317 var v = vidx - 12;
nuclear@0 318 var n = nidx - 9;
nuclear@0 319
nuclear@0 320 for(i=0; i<4; i++) {
nuclear@0 321 if(gl_use_color) {
nuclear@0 322 gl_color[vidx] = gl_color[v];
nuclear@0 323 }
nuclear@0 324 if(gl_use_texcoord) {
nuclear@0 325 gl_texcoord[vidx] = gl_texcoord[v];
nuclear@0 326 }
nuclear@0 327 gl_vertex[vidx++] = gl_vertex[v++];
nuclear@0 328
nuclear@0 329 if(gl_use_normal && i < 3) {
nuclear@0 330 gl_normal[nidx++] = gl_normal[n++];
nuclear@0 331 }
nuclear@0 332 }
nuclear@0 333 v += 4;
nuclear@0 334 n += 3;
nuclear@0 335 for(i=0; i<4; i++) {
nuclear@0 336 if(gl_use_color) {
nuclear@0 337 gl_color[vidx] = gl_color[v];
nuclear@0 338 }
nuclear@0 339 if(gl_use_texcoord) {
nuclear@0 340 gl_texcoord[vidx] = gl_texcoord[v];
nuclear@0 341 }
nuclear@0 342 gl_vertex[vidx++] = gl_vertex[v++];
nuclear@0 343
nuclear@0 344 if(gl_use_normal && i < 3) {
nuclear@0 345 gl_normal[nidx++] = gl_normal[n++];
nuclear@0 346 }
nuclear@0 347 }
nuclear@0 348
nuclear@0 349 gl_nverts += 2;
nuclear@0 350 }
nuclear@0 351
nuclear@0 352 gl_vertex[vidx] = x;
nuclear@0 353 gl_vertex[vidx + 1] = y;
nuclear@0 354 gl_vertex[vidx + 2] = z;
nuclear@0 355 gl_vertex[vidx + 3] = 1.0;
nuclear@0 356
nuclear@0 357 if(gl_use_color) {
nuclear@0 358 gl_color[vidx] = gl_curr_color[0];
nuclear@0 359 gl_color[vidx + 1] = gl_curr_color[1];
nuclear@0 360 gl_color[vidx + 2] = gl_curr_color[2];
nuclear@0 361 gl_color[vidx + 3] = gl_curr_color[3];
nuclear@0 362 }
nuclear@0 363
nuclear@0 364 if(gl_use_normal) {
nuclear@0 365 gl_normal[nidx] = gl_curr_normal[0];
nuclear@0 366 gl_normal[nidx + 1] = gl_curr_normal[1];
nuclear@0 367 gl_normal[nidx + 2] = gl_curr_normal[2];
nuclear@0 368 }
nuclear@0 369
nuclear@0 370 if(gl_use_texcoord) {
nuclear@0 371 gl_texcoord[vidx] = gl_curr_texcoord[0];
nuclear@0 372 gl_texcoord[vidx + 1] = gl_curr_texcoord[1];
nuclear@0 373 gl_texcoord[vidx + 2] = gl_texcoord[vidx + 3] = 0.0;
nuclear@0 374 }
nuclear@0 375
nuclear@0 376 gl_vert_calls++;
nuclear@0 377 if(++gl_nverts >= GL_MAX_VERTS) {
nuclear@0 378 gl_draw_immediate();
nuclear@0 379 glBegin(gl_prim); /* reset everything */
nuclear@0 380 }
nuclear@0 381 }
nuclear@0 382
nuclear@0 383 function glNormal3f(x, y, z)
nuclear@0 384 {
nuclear@0 385 gl_curr_normal[0] = x;
nuclear@0 386 gl_curr_normal[1] = y;
nuclear@0 387 gl_curr_normal[3] = z;
nuclear@0 388 }
nuclear@0 389
nuclear@0 390 function glColor3f(r, g, b)
nuclear@0 391 {
nuclear@0 392 gl_curr_color[0] = r;
nuclear@0 393 gl_curr_color[1] = g;
nuclear@0 394 gl_curr_color[2] = b;
nuclear@0 395 gl_curr_color[3] = 1.0;
nuclear@0 396 }
nuclear@0 397
nuclear@0 398 function glColor4f(r, g, b, a)
nuclear@0 399 {
nuclear@0 400 gl_curr_color[0] = r;
nuclear@0 401 gl_curr_color[1] = g;
nuclear@0 402 gl_curr_color[2] = b;
nuclear@0 403 gl_curr_color[3] = a;
nuclear@0 404 }
nuclear@0 405
nuclear@0 406 function glTexCoord1f(s)
nuclear@0 407 {
nuclear@0 408 gl_curr_texcoord[0] = s;
nuclear@0 409 gl_curr_texcoord[1] = 0.0;
nuclear@0 410 }
nuclear@0 411
nuclear@0 412 function glTexCoord2f(s, t)
nuclear@0 413 {
nuclear@0 414 gl_curr_texcoord[0] = s;
nuclear@0 415 gl_curr_texcoord[1] = t;
nuclear@0 416 }