1 /* libs/opengles/state.cpp 2 ** 3 ** Copyright 2006, The Android Open Source Project 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 18 #include <stdlib.h> 19 20 #include "context.h" 21 #include "fp.h" 22 #include "state.h" 23 #include "array.h" 24 #include "matrix.h" 25 #include "vertex.h" 26 #include "light.h" 27 #include "texture.h" 28 #include "BufferObjectManager.h" 29 #include "TextureObjectManager.h" 30 31 namespace android { 32 33 // ---------------------------------------------------------------------------- 34 35 static char const * const gVendorString = "Android"; 36 static char const * const gRendererString = "Android PixelFlinger 1.4"; 37 static char const * const gVersionString = "OpenGL ES-CM 1.0"; 38 static char const * const gExtensionsString = 39 "GL_OES_byte_coordinates " // OK 40 "GL_OES_fixed_point " // OK 41 "GL_OES_single_precision " // OK 42 "GL_OES_read_format " // OK 43 "GL_OES_compressed_paletted_texture " // OK 44 "GL_OES_draw_texture " // OK 45 "GL_OES_matrix_get " // OK 46 "GL_OES_query_matrix " // OK 47 // "GL_OES_point_size_array " // TODO 48 // "GL_OES_point_sprite " // TODO 49 "GL_OES_EGL_image " // OK 50 "GL_OES_EGL_sync " // OK 51 #ifdef GL_OES_compressed_ETC1_RGB8_texture 52 "GL_OES_compressed_ETC1_RGB8_texture " // OK 53 #endif 54 "GL_ARB_texture_compression " // OK 55 "GL_ARB_texture_non_power_of_two " // OK 56 "GL_ANDROID_user_clip_plane " // OK 57 "GL_ANDROID_vertex_buffer_object " // OK 58 "GL_ANDROID_generate_mipmap " // OK 59 ; 60 61 // ---------------------------------------------------------------------------- 62 #if 0 63 #pragma mark - 64 #endif 65 66 ogles_context_t *ogles_init(size_t extra) 67 { 68 void* const base = malloc(extra + sizeof(ogles_context_t) + 32); 69 if (!base) return 0; 70 71 ogles_context_t *c = 72 (ogles_context_t *)((ptrdiff_t(base) + extra + 31) & ~0x1FL); 73 memset(c, 0, sizeof(ogles_context_t)); 74 ggl_init_context(&(c->rasterizer)); 75 76 // XXX: this should be passed as an argument 77 sp<EGLSurfaceManager> smgr(new EGLSurfaceManager()); 78 c->surfaceManager = smgr.get(); 79 c->surfaceManager->incStrong(c); 80 81 sp<EGLBufferObjectManager> bomgr(new EGLBufferObjectManager()); 82 c->bufferObjectManager = bomgr.get(); 83 c->bufferObjectManager->incStrong(c); 84 85 ogles_init_array(c); 86 ogles_init_matrix(c); 87 ogles_init_vertex(c); 88 ogles_init_light(c); 89 ogles_init_texture(c); 90 91 c->rasterizer.base = base; 92 c->point.size = TRI_ONE; 93 c->line.width = TRI_ONE; 94 95 // in OpenGL, writing to the depth buffer is enabled by default. 96 c->rasterizer.procs.depthMask(c, 1); 97 98 // OpenGL enables dithering by default 99 c->rasterizer.procs.enable(c, GL_DITHER); 100 101 return c; 102 } 103 104 void ogles_uninit(ogles_context_t* c) 105 { 106 ogles_uninit_array(c); 107 ogles_uninit_matrix(c); 108 ogles_uninit_vertex(c); 109 ogles_uninit_light(c); 110 ogles_uninit_texture(c); 111 c->surfaceManager->decStrong(c); 112 c->bufferObjectManager->decStrong(c); 113 ggl_uninit_context(&(c->rasterizer)); 114 free(c->rasterizer.base); 115 } 116 117 void _ogles_error(ogles_context_t* c, GLenum error) 118 { 119 if (c->error == GL_NO_ERROR) 120 c->error = error; 121 } 122 123 static bool stencilop_valid(GLenum op) { 124 switch (op) { 125 case GL_KEEP: 126 case GL_ZERO: 127 case GL_REPLACE: 128 case GL_INCR: 129 case GL_DECR: 130 case GL_INVERT: 131 return true; 132 } 133 return false; 134 } 135 136 static void enable_disable(ogles_context_t* c, GLenum cap, int enabled) 137 { 138 if ((cap >= GL_LIGHT0) && (cap<GL_LIGHT0+OGLES_MAX_LIGHTS)) { 139 c->lighting.lights[cap-GL_LIGHT0].enable = enabled; 140 c->lighting.enabledLights &= ~(1<<(cap-GL_LIGHT0)); 141 c->lighting.enabledLights |= (enabled<<(cap-GL_LIGHT0)); 142 return; 143 } 144 145 switch (cap) { 146 case GL_POINT_SMOOTH: 147 c->point.smooth = enabled; 148 break; 149 case GL_LINE_SMOOTH: 150 c->line.smooth = enabled; 151 break; 152 case GL_POLYGON_OFFSET_FILL: 153 c->polygonOffset.enable = enabled; 154 break; 155 case GL_CULL_FACE: 156 c->cull.enable = enabled; 157 break; 158 case GL_LIGHTING: 159 c->lighting.enable = enabled; 160 break; 161 case GL_COLOR_MATERIAL: 162 c->lighting.colorMaterial.enable = enabled; 163 break; 164 case GL_NORMALIZE: 165 case GL_RESCALE_NORMAL: 166 c->transforms.rescaleNormals = enabled ? cap : 0; 167 // XXX: invalidate mvit 168 break; 169 170 case GL_CLIP_PLANE0: 171 case GL_CLIP_PLANE1: 172 case GL_CLIP_PLANE2: 173 case GL_CLIP_PLANE3: 174 case GL_CLIP_PLANE4: 175 case GL_CLIP_PLANE5: 176 c->clipPlanes.enable &= ~(1<<(cap-GL_CLIP_PLANE0)); 177 c->clipPlanes.enable |= (enabled<<(cap-GL_CLIP_PLANE0)); 178 ogles_invalidate_perspective(c); 179 break; 180 181 case GL_FOG: 182 case GL_DEPTH_TEST: 183 ogles_invalidate_perspective(c); 184 // fall-through... 185 case GL_BLEND: 186 case GL_SCISSOR_TEST: 187 case GL_ALPHA_TEST: 188 case GL_COLOR_LOGIC_OP: 189 case GL_DITHER: 190 case GL_STENCIL_TEST: 191 case GL_TEXTURE_2D: 192 // these need to fall through into the rasterizer 193 c->rasterizer.procs.enableDisable(c, cap, enabled); 194 break; 195 case GL_TEXTURE_EXTERNAL_OES: 196 c->rasterizer.procs.enableDisable(c, GL_TEXTURE_2D, enabled); 197 break; 198 199 case GL_MULTISAMPLE: 200 case GL_SAMPLE_ALPHA_TO_COVERAGE: 201 case GL_SAMPLE_ALPHA_TO_ONE: 202 case GL_SAMPLE_COVERAGE: 203 // not supported in this implementation 204 break; 205 206 default: 207 ogles_error(c, GL_INVALID_ENUM); 208 return; 209 } 210 } 211 212 // ---------------------------------------------------------------------------- 213 }; // namespace android 214 // ---------------------------------------------------------------------------- 215 using namespace android; 216 217 #if 0 218 #pragma mark - 219 #endif 220 221 // These ones are super-easy, we're not supporting those features! 222 void glSampleCoverage(GLclampf value, GLboolean invert) { 223 } 224 void glSampleCoveragex(GLclampx value, GLboolean invert) { 225 } 226 void glStencilFunc(GLenum func, GLint ref, GLuint mask) { 227 ogles_context_t* c = ogles_context_t::get(); 228 if (func < GL_NEVER || func > GL_ALWAYS) { 229 ogles_error(c, GL_INVALID_ENUM); 230 return; 231 } 232 // from OpenGL|ES 1.0 sepcification: 233 // If there is no stencil buffer, no stencil modification can occur 234 // and it is as if the stencil test always passes. 235 } 236 237 void glStencilOp(GLenum fail, GLenum zfail, GLenum zpass) { 238 ogles_context_t* c = ogles_context_t::get(); 239 if ((stencilop_valid(fail) & 240 stencilop_valid(zfail) & 241 stencilop_valid(zpass)) == 0) { 242 ogles_error(c, GL_INVALID_ENUM); 243 return; 244 } 245 } 246 247 // ---------------------------------------------------------------------------- 248 249 void glAlphaFunc(GLenum func, GLclampf ref) 250 { 251 glAlphaFuncx(func, gglFloatToFixed(ref)); 252 } 253 254 void glCullFace(GLenum mode) 255 { 256 ogles_context_t* c = ogles_context_t::get(); 257 switch (mode) { 258 case GL_FRONT: 259 case GL_BACK: 260 case GL_FRONT_AND_BACK: 261 break; 262 default: 263 ogles_error(c, GL_INVALID_ENUM); 264 } 265 c->cull.cullFace = mode; 266 } 267 268 void glFrontFace(GLenum mode) 269 { 270 ogles_context_t* c = ogles_context_t::get(); 271 switch (mode) { 272 case GL_CW: 273 case GL_CCW: 274 break; 275 default: 276 ogles_error(c, GL_INVALID_ENUM); 277 return; 278 } 279 c->cull.frontFace = mode; 280 } 281 282 void glHint(GLenum target, GLenum mode) 283 { 284 ogles_context_t* c = ogles_context_t::get(); 285 switch (target) { 286 case GL_FOG_HINT: 287 case GL_GENERATE_MIPMAP_HINT: 288 case GL_LINE_SMOOTH_HINT: 289 break; 290 case GL_POINT_SMOOTH_HINT: 291 c->rasterizer.procs.enableDisable(c, 292 GGL_POINT_SMOOTH_NICE, mode==GL_NICEST); 293 break; 294 case GL_PERSPECTIVE_CORRECTION_HINT: 295 c->perspective = (mode == GL_NICEST) ? 1 : 0; 296 break; 297 default: 298 ogles_error(c, GL_INVALID_ENUM); 299 } 300 } 301 302 void glEnable(GLenum cap) { 303 ogles_context_t* c = ogles_context_t::get(); 304 enable_disable(c, cap, 1); 305 } 306 void glDisable(GLenum cap) { 307 ogles_context_t* c = ogles_context_t::get(); 308 enable_disable(c, cap, 0); 309 } 310 311 void glFinish() 312 { // nothing to do for our software implementation 313 } 314 315 void glFlush() 316 { // nothing to do for our software implementation 317 } 318 319 GLenum glGetError() 320 { 321 // From OpenGL|ES 1.0 specification: 322 // If more than one flag has recorded an error, glGetError returns 323 // and clears an arbitrary error flag value. Thus, glGetError should 324 // always be called in a loop, until it returns GL_NO_ERROR, 325 // if all error flags are to be reset. 326 327 ogles_context_t* c = ogles_context_t::get(); 328 if (c->error) { 329 const GLenum ret(c->error); 330 c->error = 0; 331 return ret; 332 } 333 334 if (c->rasterizer.error) { 335 const GLenum ret(c->rasterizer.error); 336 c->rasterizer.error = 0; 337 return ret; 338 } 339 340 return GL_NO_ERROR; 341 } 342 343 const GLubyte* glGetString(GLenum string) 344 { 345 switch (string) { 346 case GL_VENDOR: return (const GLubyte*)gVendorString; 347 case GL_RENDERER: return (const GLubyte*)gRendererString; 348 case GL_VERSION: return (const GLubyte*)gVersionString; 349 case GL_EXTENSIONS: return (const GLubyte*)gExtensionsString; 350 } 351 ogles_context_t* c = ogles_context_t::get(); 352 ogles_error(c, GL_INVALID_ENUM); 353 return 0; 354 } 355 356 void glGetIntegerv(GLenum pname, GLint *params) 357 { 358 int i; 359 ogles_context_t* c = ogles_context_t::get(); 360 switch (pname) { 361 case GL_ALIASED_POINT_SIZE_RANGE: 362 params[0] = 0; 363 params[1] = GGL_MAX_ALIASED_POINT_SIZE; 364 break; 365 case GL_ALIASED_LINE_WIDTH_RANGE: 366 params[0] = 0; 367 params[1] = GGL_MAX_ALIASED_POINT_SIZE; 368 break; 369 case GL_ALPHA_BITS: { 370 int index = c->rasterizer.state.buffers.color.format; 371 GGLFormat const * formats = gglGetPixelFormatTable(); 372 params[0] = formats[index].ah - formats[index].al; 373 break; 374 } 375 case GL_RED_BITS: { 376 int index = c->rasterizer.state.buffers.color.format; 377 GGLFormat const * formats = gglGetPixelFormatTable(); 378 params[0] = formats[index].rh - formats[index].rl; 379 break; 380 } 381 case GL_GREEN_BITS: { 382 int index = c->rasterizer.state.buffers.color.format; 383 GGLFormat const * formats = gglGetPixelFormatTable(); 384 params[0] = formats[index].gh - formats[index].gl; 385 break; 386 } 387 case GL_BLUE_BITS: { 388 int index = c->rasterizer.state.buffers.color.format; 389 GGLFormat const * formats = gglGetPixelFormatTable(); 390 params[0] = formats[index].bh - formats[index].bl; 391 break; 392 } 393 case GL_COMPRESSED_TEXTURE_FORMATS: 394 params[ 0] = GL_PALETTE4_RGB8_OES; 395 params[ 1] = GL_PALETTE4_RGBA8_OES; 396 params[ 2] = GL_PALETTE4_R5_G6_B5_OES; 397 params[ 3] = GL_PALETTE4_RGBA4_OES; 398 params[ 4] = GL_PALETTE4_RGB5_A1_OES; 399 params[ 5] = GL_PALETTE8_RGB8_OES; 400 params[ 6] = GL_PALETTE8_RGBA8_OES; 401 params[ 7] = GL_PALETTE8_R5_G6_B5_OES; 402 params[ 8] = GL_PALETTE8_RGBA4_OES; 403 params[ 9] = GL_PALETTE8_RGB5_A1_OES; 404 i = 10; 405 #ifdef GL_OES_compressed_ETC1_RGB8_texture 406 params[i++] = GL_ETC1_RGB8_OES; 407 #endif 408 break; 409 case GL_DEPTH_BITS: 410 params[0] = c->rasterizer.state.buffers.depth.format ? 0 : 16; 411 break; 412 case GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES: 413 params[0] = GL_RGB; 414 break; 415 case GL_IMPLEMENTATION_COLOR_READ_TYPE_OES: 416 params[0] = GL_UNSIGNED_SHORT_5_6_5; 417 break; 418 case GL_MAX_LIGHTS: 419 params[0] = OGLES_MAX_LIGHTS; 420 break; 421 case GL_MAX_CLIP_PLANES: 422 params[0] = OGLES_MAX_CLIP_PLANES; 423 break; 424 case GL_MAX_MODELVIEW_STACK_DEPTH: 425 params[0] = OGLES_MODELVIEW_STACK_DEPTH; 426 break; 427 case GL_MAX_PROJECTION_STACK_DEPTH: 428 params[0] = OGLES_PROJECTION_STACK_DEPTH; 429 break; 430 case GL_MAX_TEXTURE_STACK_DEPTH: 431 params[0] = OGLES_TEXTURE_STACK_DEPTH; 432 break; 433 case GL_MAX_TEXTURE_SIZE: 434 params[0] = GGL_MAX_TEXTURE_SIZE; 435 break; 436 case GL_MAX_TEXTURE_UNITS: 437 params[0] = GGL_TEXTURE_UNIT_COUNT; 438 break; 439 case GL_MAX_VIEWPORT_DIMS: 440 params[0] = GGL_MAX_VIEWPORT_DIMS; 441 params[1] = GGL_MAX_VIEWPORT_DIMS; 442 break; 443 case GL_NUM_COMPRESSED_TEXTURE_FORMATS: 444 params[0] = OGLES_NUM_COMPRESSED_TEXTURE_FORMATS; 445 break; 446 case GL_SMOOTH_LINE_WIDTH_RANGE: 447 params[0] = 0; 448 params[1] = GGL_MAX_SMOOTH_LINE_WIDTH; 449 break; 450 case GL_SMOOTH_POINT_SIZE_RANGE: 451 params[0] = 0; 452 params[1] = GGL_MAX_SMOOTH_POINT_SIZE; 453 break; 454 case GL_STENCIL_BITS: 455 params[0] = 0; 456 break; 457 case GL_SUBPIXEL_BITS: 458 params[0] = GGL_SUBPIXEL_BITS; 459 break; 460 461 case GL_MODELVIEW_MATRIX_FLOAT_AS_INT_BITS_OES: 462 memcpy( params, 463 c->transforms.modelview.top().elements(), 464 16*sizeof(GLint)); 465 break; 466 case GL_PROJECTION_MATRIX_FLOAT_AS_INT_BITS_OES: 467 memcpy( params, 468 c->transforms.projection.top().elements(), 469 16*sizeof(GLint)); 470 break; 471 case GL_TEXTURE_MATRIX_FLOAT_AS_INT_BITS_OES: 472 memcpy( params, 473 c->transforms.texture[c->textures.active].top().elements(), 474 16*sizeof(GLint)); 475 break; 476 477 default: 478 ogles_error(c, GL_INVALID_ENUM); 479 break; 480 } 481 } 482 483 // ---------------------------------------------------------------------------- 484 485 void glPointSize(GLfloat size) 486 { 487 ogles_context_t* c = ogles_context_t::get(); 488 if (size <= 0) { 489 ogles_error(c, GL_INVALID_ENUM); 490 return; 491 } 492 c->point.size = TRI_FROM_FIXED(gglFloatToFixed(size)); 493 } 494 495 void glPointSizex(GLfixed size) 496 { 497 ogles_context_t* c = ogles_context_t::get(); 498 if (size <= 0) { 499 ogles_error(c, GL_INVALID_ENUM); 500 return; 501 } 502 c->point.size = TRI_FROM_FIXED(size); 503 } 504 505 // ---------------------------------------------------------------------------- 506 507 void glLineWidth(GLfloat width) 508 { 509 ogles_context_t* c = ogles_context_t::get(); 510 if (width <= 0) { 511 ogles_error(c, GL_INVALID_ENUM); 512 return; 513 } 514 c->line.width = TRI_FROM_FIXED(gglFloatToFixed(width)); 515 } 516 517 void glLineWidthx(GLfixed width) 518 { 519 ogles_context_t* c = ogles_context_t::get(); 520 if (width <= 0) { 521 ogles_error(c, GL_INVALID_ENUM); 522 return; 523 } 524 c->line.width = TRI_FROM_FIXED(width); 525 } 526 527 // ---------------------------------------------------------------------------- 528 529 void glColorMask(GLboolean r, GLboolean g, GLboolean b, GLboolean a) { 530 ogles_context_t* c = ogles_context_t::get(); 531 c->rasterizer.procs.colorMask(c, r, g, b, a); 532 } 533 534 void glDepthMask(GLboolean flag) { 535 ogles_context_t* c = ogles_context_t::get(); 536 c->rasterizer.procs.depthMask(c, flag); 537 } 538 539 void glStencilMask(GLuint mask) { 540 ogles_context_t* c = ogles_context_t::get(); 541 c->rasterizer.procs.stencilMask(c, mask); 542 } 543 544 void glDepthFunc(GLenum func) { 545 ogles_context_t* c = ogles_context_t::get(); 546 c->rasterizer.procs.depthFunc(c, func); 547 } 548 549 void glLogicOp(GLenum opcode) { 550 ogles_context_t* c = ogles_context_t::get(); 551 c->rasterizer.procs.logicOp(c, opcode); 552 } 553 554 void glAlphaFuncx(GLenum func, GLclampx ref) { 555 ogles_context_t* c = ogles_context_t::get(); 556 c->rasterizer.procs.alphaFuncx(c, func, ref); 557 } 558 559 void glBlendFunc(GLenum sfactor, GLenum dfactor) { 560 ogles_context_t* c = ogles_context_t::get(); 561 c->rasterizer.procs.blendFunc(c, sfactor, dfactor); 562 } 563 564 void glClear(GLbitfield mask) { 565 ogles_context_t* c = ogles_context_t::get(); 566 c->rasterizer.procs.clear(c, mask); 567 } 568 569 void glClearColorx(GLclampx red, GLclampx green, GLclampx blue, GLclampx alpha) { 570 ogles_context_t* c = ogles_context_t::get(); 571 c->rasterizer.procs.clearColorx(c, red, green, blue, alpha); 572 } 573 574 void glClearColor(GLclampf r, GLclampf g, GLclampf b, GLclampf a) 575 { 576 ogles_context_t* c = ogles_context_t::get(); 577 c->rasterizer.procs.clearColorx(c, 578 gglFloatToFixed(r), 579 gglFloatToFixed(g), 580 gglFloatToFixed(b), 581 gglFloatToFixed(a)); 582 } 583 584 void glClearDepthx(GLclampx depth) { 585 ogles_context_t* c = ogles_context_t::get(); 586 c->rasterizer.procs.clearDepthx(c, depth); 587 } 588 589 void glClearDepthf(GLclampf depth) 590 { 591 ogles_context_t* c = ogles_context_t::get(); 592 c->rasterizer.procs.clearDepthx(c, gglFloatToFixed(depth)); 593 } 594 595 void glClearStencil(GLint s) { 596 ogles_context_t* c = ogles_context_t::get(); 597 c->rasterizer.procs.clearStencil(c, s); 598 } 599
