1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.renderscript; 18 19 20 /** 21 * @hide 22 * <p>ProgramStore contains a set of parameters that control how 23 * the graphics hardware handles writes to the framebuffer. 24 * It could be used to:</p> 25 * <ul> 26 * <li>enable/disable depth testing</li> 27 * <li>specify wheather depth writes are performed</li> 28 * <li>setup various blending modes for use in effects like 29 * transparency</li> 30 * <li>define write masks for color components written into the 31 * framebuffer</li> 32 * </ul> 33 * 34 **/ 35 public class ProgramStore extends BaseObj { 36 /** 37 * Specifies the function used to determine whether a fragment 38 * will be drawn during the depth testing stage in the rendering 39 * pipeline by comparing its value with that already in the depth 40 * buffer. DepthFunc is only valid when depth buffer is present 41 * and depth testing is enabled 42 */ 43 public enum DepthFunc { 44 45 /** 46 * Always drawn 47 */ 48 ALWAYS (0), 49 /** 50 * Drawn if the incoming depth value is less than that in the 51 * depth buffer 52 */ 53 LESS (1), 54 /** 55 * Drawn if the incoming depth value is less or equal to that in 56 * the depth buffer 57 */ 58 LESS_OR_EQUAL (2), 59 /** 60 * Drawn if the incoming depth value is greater than that in the 61 * depth buffer 62 */ 63 GREATER (3), 64 /** 65 * Drawn if the incoming depth value is greater or equal to that 66 * in the depth buffer 67 */ 68 GREATER_OR_EQUAL (4), 69 /** 70 * Drawn if the incoming depth value is equal to that in the 71 * depth buffer 72 */ 73 EQUAL (5), 74 /** 75 * Drawn if the incoming depth value is not equal to that in the 76 * depth buffer 77 */ 78 NOT_EQUAL (6); 79 80 int mID; 81 DepthFunc(int id) { 82 mID = id; 83 } 84 } 85 86 /** 87 * Specifies the functions used to combine incoming pixels with 88 * those already in the frame buffer. 89 * 90 * BlendSrcFunc describes how the coefficient used to scale the 91 * source pixels during the blending operation is computed 92 * 93 */ 94 public enum BlendSrcFunc { 95 ZERO (0), 96 ONE (1), 97 DST_COLOR (2), 98 ONE_MINUS_DST_COLOR (3), 99 SRC_ALPHA (4), 100 ONE_MINUS_SRC_ALPHA (5), 101 DST_ALPHA (6), 102 ONE_MINUS_DST_ALPHA (7), 103 SRC_ALPHA_SATURATE (8); 104 105 int mID; 106 BlendSrcFunc(int id) { 107 mID = id; 108 } 109 } 110 111 /** 112 * Specifies the functions used to combine incoming pixels with 113 * those already in the frame buffer. 114 * 115 * BlendDstFunc describes how the coefficient used to scale the 116 * pixels already in the framebuffer is computed during the 117 * blending operation 118 * 119 */ 120 public enum BlendDstFunc { 121 ZERO (0), 122 ONE (1), 123 SRC_COLOR (2), 124 ONE_MINUS_SRC_COLOR (3), 125 SRC_ALPHA (4), 126 ONE_MINUS_SRC_ALPHA (5), 127 DST_ALPHA (6), 128 ONE_MINUS_DST_ALPHA (7); 129 130 int mID; 131 BlendDstFunc(int id) { 132 mID = id; 133 } 134 } 135 136 DepthFunc mDepthFunc; 137 boolean mDepthMask; 138 boolean mColorMaskR; 139 boolean mColorMaskG; 140 boolean mColorMaskB; 141 boolean mColorMaskA; 142 BlendSrcFunc mBlendSrc; 143 BlendDstFunc mBlendDst; 144 boolean mDither; 145 146 ProgramStore(long id, RenderScript rs) { 147 super(id, rs); 148 } 149 150 /** 151 * Returns the function used to test writing into the depth 152 * buffer 153 * @return depth function 154 */ 155 public DepthFunc getDepthFunc() { 156 return mDepthFunc; 157 } 158 159 /** 160 * Queries whether writes are enabled into the depth buffer 161 * @return depth mask 162 */ 163 public boolean isDepthMaskEnabled() { 164 return mDepthMask; 165 } 166 167 /** 168 * Queries whether red channel is written 169 * @return red color channel mask 170 */ 171 public boolean isColorMaskRedEnabled() { 172 return mColorMaskR; 173 } 174 175 /** 176 * Queries whether green channel is written 177 * @return green color channel mask 178 */ 179 public boolean isColorMaskGreenEnabled() { 180 return mColorMaskG; 181 } 182 183 /** 184 * Queries whether blue channel is written 185 * @return blue color channel mask 186 */ 187 public boolean isColorMaskBlueEnabled() { 188 return mColorMaskB; 189 } 190 191 /** 192 * Queries whether alpha channel is written 193 * @return alpha channel mask 194 */ 195 public boolean isColorMaskAlphaEnabled() { 196 return mColorMaskA; 197 } 198 199 /** 200 * Specifies how the source blending factor is computed 201 * @return source blend function 202 */ 203 public BlendSrcFunc getBlendSrcFunc() { 204 return mBlendSrc; 205 } 206 207 /** 208 * Specifies how the destination blending factor is computed 209 * @return destination blend function 210 */ 211 public BlendDstFunc getBlendDstFunc() { 212 return mBlendDst; 213 } 214 215 /** 216 * Specifies whether colors are dithered before writing into the 217 * framebuffer 218 * @return whether dither is enabled 219 */ 220 public boolean isDitherEnabled() { 221 return mDither; 222 } 223 224 /** 225 * Returns a pre-defined program store object with the following 226 * characteristics: 227 * - incoming pixels are drawn if their depth value is less than 228 * the stored value in the depth buffer. If the pixel is 229 * drawn, its value is also stored in the depth buffer 230 * - incoming pixels override the value stored in the color 231 * buffer if it passes the depth test 232 * 233 * @param rs Context to which the program will belong. 234 **/ 235 public static ProgramStore BLEND_NONE_DEPTH_TEST(RenderScript rs) { 236 if(rs.mProgramStore_BLEND_NONE_DEPTH_TEST == null) { 237 ProgramStore.Builder builder = new ProgramStore.Builder(rs); 238 builder.setDepthFunc(ProgramStore.DepthFunc.LESS); 239 builder.setBlendFunc(BlendSrcFunc.ONE, BlendDstFunc.ZERO); 240 builder.setDitherEnabled(false); 241 builder.setDepthMaskEnabled(true); 242 rs.mProgramStore_BLEND_NONE_DEPTH_TEST = builder.create(); 243 } 244 return rs.mProgramStore_BLEND_NONE_DEPTH_TEST; 245 } 246 /** 247 * Returns a pre-defined program store object with the following 248 * characteristics: 249 * - incoming pixels always pass the depth test and their value 250 * is not stored in the depth buffer 251 * - incoming pixels override the value stored in the color 252 * buffer 253 * 254 * @param rs Context to which the program will belong. 255 **/ 256 public static ProgramStore BLEND_NONE_DEPTH_NONE(RenderScript rs) { 257 if(rs.mProgramStore_BLEND_NONE_DEPTH_NO_DEPTH == null) { 258 ProgramStore.Builder builder = new ProgramStore.Builder(rs); 259 builder.setDepthFunc(ProgramStore.DepthFunc.ALWAYS); 260 builder.setBlendFunc(BlendSrcFunc.ONE, BlendDstFunc.ZERO); 261 builder.setDitherEnabled(false); 262 builder.setDepthMaskEnabled(false); 263 rs.mProgramStore_BLEND_NONE_DEPTH_NO_DEPTH = builder.create(); 264 } 265 return rs.mProgramStore_BLEND_NONE_DEPTH_NO_DEPTH; 266 } 267 /** 268 * Returns a pre-defined program store object with the following 269 * characteristics: 270 * - incoming pixels are drawn if their depth value is less than 271 * the stored value in the depth buffer. If the pixel is 272 * drawn, its value is also stored in the depth buffer 273 * - if the incoming (Source) pixel passes depth test, its value 274 * is combined with the stored color (Dest) using the 275 * following formula 276 * Final.RGB = Source.RGB * Source.A + Dest.RGB * (1 - Source.A) 277 * 278 * @param rs Context to which the program will belong. 279 **/ 280 public static ProgramStore BLEND_ALPHA_DEPTH_TEST(RenderScript rs) { 281 if(rs.mProgramStore_BLEND_ALPHA_DEPTH_TEST == null) { 282 ProgramStore.Builder builder = new ProgramStore.Builder(rs); 283 builder.setDepthFunc(ProgramStore.DepthFunc.LESS); 284 builder.setBlendFunc(BlendSrcFunc.SRC_ALPHA, BlendDstFunc.ONE_MINUS_SRC_ALPHA); 285 builder.setDitherEnabled(false); 286 builder.setDepthMaskEnabled(true); 287 rs.mProgramStore_BLEND_ALPHA_DEPTH_TEST = builder.create(); 288 } 289 return rs.mProgramStore_BLEND_ALPHA_DEPTH_TEST; 290 } 291 /** 292 * Returns a pre-defined program store object with the following 293 * characteristics: 294 * - incoming pixels always pass the depth test and their value 295 * is not stored in the depth buffer 296 * - incoming pixel's value is combined with the stored color 297 * (Dest) using the following formula 298 * Final.RGB = Source.RGB * Source.A + Dest.RGB * (1 - Source.A) 299 * 300 * @param rs Context to which the program will belong. 301 **/ 302 public static ProgramStore BLEND_ALPHA_DEPTH_NONE(RenderScript rs) { 303 if(rs.mProgramStore_BLEND_ALPHA_DEPTH_NO_DEPTH == null) { 304 ProgramStore.Builder builder = new ProgramStore.Builder(rs); 305 builder.setDepthFunc(ProgramStore.DepthFunc.ALWAYS); 306 builder.setBlendFunc(BlendSrcFunc.SRC_ALPHA, BlendDstFunc.ONE_MINUS_SRC_ALPHA); 307 builder.setDitherEnabled(false); 308 builder.setDepthMaskEnabled(false); 309 rs.mProgramStore_BLEND_ALPHA_DEPTH_NO_DEPTH = builder.create(); 310 } 311 return rs.mProgramStore_BLEND_ALPHA_DEPTH_NO_DEPTH; 312 } 313 314 /** 315 * Builder class for ProgramStore object. If the builder is left 316 * empty, the equivalent of BLEND_NONE_DEPTH_NONE would be 317 * returned 318 */ 319 public static class Builder { 320 RenderScript mRS; 321 DepthFunc mDepthFunc; 322 boolean mDepthMask; 323 boolean mColorMaskR; 324 boolean mColorMaskG; 325 boolean mColorMaskB; 326 boolean mColorMaskA; 327 BlendSrcFunc mBlendSrc; 328 BlendDstFunc mBlendDst; 329 boolean mDither; 330 331 public Builder(RenderScript rs) { 332 mRS = rs; 333 mDepthFunc = DepthFunc.ALWAYS; 334 mDepthMask = false; 335 mColorMaskR = true; 336 mColorMaskG = true; 337 mColorMaskB = true; 338 mColorMaskA = true; 339 mBlendSrc = BlendSrcFunc.ONE; 340 mBlendDst = BlendDstFunc.ZERO; 341 } 342 343 /** 344 * Specifies the depth testing behavior 345 * 346 * @param func function used for depth testing 347 * 348 * @return this 349 */ 350 public Builder setDepthFunc(DepthFunc func) { 351 mDepthFunc = func; 352 return this; 353 } 354 355 /** 356 * Enables writes into the depth buffer 357 * 358 * @param enable specifies whether depth writes are 359 * enabled or disabled 360 * 361 * @return this 362 */ 363 public Builder setDepthMaskEnabled(boolean enable) { 364 mDepthMask = enable; 365 return this; 366 } 367 368 /** 369 * Enables writes into the color buffer 370 * 371 * @param r specifies whether red channel is written 372 * @param g specifies whether green channel is written 373 * @param b specifies whether blue channel is written 374 * @param a specifies whether alpha channel is written 375 * 376 * @return this 377 */ 378 public Builder setColorMaskEnabled(boolean r, boolean g, boolean b, boolean a) { 379 mColorMaskR = r; 380 mColorMaskG = g; 381 mColorMaskB = b; 382 mColorMaskA = a; 383 return this; 384 } 385 386 /** 387 * Specifies how incoming pixels are combined with the pixels 388 * stored in the framebuffer 389 * 390 * @param src specifies how the source blending factor is 391 * computed 392 * @param dst specifies how the destination blending factor is 393 * computed 394 * 395 * @return this 396 */ 397 public Builder setBlendFunc(BlendSrcFunc src, BlendDstFunc dst) { 398 mBlendSrc = src; 399 mBlendDst = dst; 400 return this; 401 } 402 403 /** 404 * Enables dithering 405 * 406 * @param enable specifies whether dithering is enabled or 407 * disabled 408 * 409 * @return this 410 */ 411 public Builder setDitherEnabled(boolean enable) { 412 mDither = enable; 413 return this; 414 } 415 416 /** 417 * Creates a program store from the current state of the builder 418 */ 419 public ProgramStore create() { 420 mRS.validate(); 421 long id = mRS.nProgramStoreCreate(mColorMaskR, mColorMaskG, mColorMaskB, mColorMaskA, 422 mDepthMask, mDither, 423 mBlendSrc.mID, mBlendDst.mID, mDepthFunc.mID); 424 ProgramStore programStore = new ProgramStore(id, mRS); 425 programStore.mDepthFunc = mDepthFunc; 426 programStore.mDepthMask = mDepthMask; 427 programStore.mColorMaskR = mColorMaskR; 428 programStore.mColorMaskG = mColorMaskG; 429 programStore.mColorMaskB = mColorMaskB; 430 programStore.mColorMaskA = mColorMaskA; 431 programStore.mBlendSrc = mBlendSrc; 432 programStore.mBlendDst = mBlendDst; 433 programStore.mDither = mDither; 434 return programStore; 435 } 436 } 437 438 } 439 440 441 442 443
