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