J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | #ifndef HEADLESS |
| 27 | |
| 28 | #include <jlong.h> |
| 29 | #include <string.h> |
| 30 | |
| 31 | #include "sun_java2d_SunGraphics2D.h" |
| 32 | #include "sun_java2d_pipe_BufferedPaints.h" |
| 33 | |
| 34 | #include "OGLPaints.h" |
| 35 | #include "OGLContext.h" |
| 36 | #include "OGLRenderQueue.h" |
| 37 | #include "OGLSurfaceData.h" |
| 38 | |
| 39 | void |
| 40 | OGLPaints_ResetPaint(OGLContext *oglc) |
| 41 | { |
| 42 | jubyte ea; |
| 43 | |
| 44 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_ResetPaint"); |
| 45 | |
| 46 | RETURN_IF_NULL(oglc); |
| 47 | J2dTraceLn1(J2D_TRACE_VERBOSE, " state=%d", oglc->paintState); |
| 48 | RESET_PREVIOUS_OP(); |
| 49 | |
| 50 | if (oglc->useMask) { |
| 51 | // switch to texture unit 1, where paint state is currently enabled |
| 52 | j2d_glActiveTextureARB(GL_TEXTURE1_ARB); |
| 53 | } |
| 54 | |
| 55 | switch (oglc->paintState) { |
| 56 | case sun_java2d_SunGraphics2D_PAINT_GRADIENT: |
| 57 | j2d_glDisable(GL_TEXTURE_1D); |
| 58 | j2d_glDisable(GL_TEXTURE_GEN_S); |
| 59 | break; |
| 60 | |
| 61 | case sun_java2d_SunGraphics2D_PAINT_TEXTURE: |
| 62 | // Note: The texture object used in SetTexturePaint() will |
| 63 | // still be bound at this point, so it is safe to call the following. |
| 64 | OGLSD_RESET_TEXTURE_WRAP(GL_TEXTURE_2D); |
| 65 | j2d_glDisable(GL_TEXTURE_2D); |
| 66 | j2d_glDisable(GL_TEXTURE_GEN_S); |
| 67 | j2d_glDisable(GL_TEXTURE_GEN_T); |
| 68 | break; |
| 69 | |
| 70 | case sun_java2d_SunGraphics2D_PAINT_LIN_GRADIENT: |
| 71 | case sun_java2d_SunGraphics2D_PAINT_RAD_GRADIENT: |
| 72 | j2d_glUseProgramObjectARB(0); |
| 73 | j2d_glDisable(GL_TEXTURE_1D); |
| 74 | break; |
| 75 | |
| 76 | case sun_java2d_SunGraphics2D_PAINT_ALPHACOLOR: |
| 77 | default: |
| 78 | break; |
| 79 | } |
| 80 | |
| 81 | if (oglc->useMask) { |
| 82 | // restore control to texture unit 0 |
| 83 | j2d_glActiveTextureARB(GL_TEXTURE0_ARB); |
| 84 | } |
| 85 | |
| 86 | // set each component of the current color state to the extra alpha |
| 87 | // value, which will effectively apply the extra alpha to each fragment |
| 88 | // in paint/texturing operations |
| 89 | ea = (jubyte)(oglc->extraAlpha * 0xff + 0.5f); |
| 90 | j2d_glColor4ub(ea, ea, ea, ea); |
| 91 | oglc->pixel = (ea << 24) | (ea << 16) | (ea << 8) | (ea << 0); |
| 92 | oglc->r = ea; |
| 93 | oglc->g = ea; |
| 94 | oglc->b = ea; |
| 95 | oglc->a = ea; |
| 96 | oglc->useMask = JNI_FALSE; |
| 97 | oglc->paintState = -1; |
| 98 | } |
| 99 | |
| 100 | void |
| 101 | OGLPaints_SetColor(OGLContext *oglc, jint pixel) |
| 102 | { |
| 103 | jubyte r, g, b, a; |
| 104 | |
| 105 | J2dTraceLn1(J2D_TRACE_INFO, "OGLPaints_SetColor: pixel=%08x", pixel); |
| 106 | |
| 107 | RETURN_IF_NULL(oglc); |
| 108 | |
| 109 | // glColor*() is allowed within glBegin()/glEnd() pairs, so |
| 110 | // no need to reset the current op state here unless the paint |
| 111 | // state really needs to be changed |
| 112 | if (oglc->paintState > sun_java2d_SunGraphics2D_PAINT_ALPHACOLOR) { |
| 113 | OGLPaints_ResetPaint(oglc); |
| 114 | } |
| 115 | |
| 116 | // store the raw (unmodified) pixel value, which may be used for |
| 117 | // special operations later |
| 118 | oglc->pixel = pixel; |
| 119 | |
| 120 | if (oglc->compState != sun_java2d_SunGraphics2D_COMP_XOR) { |
| 121 | r = (jubyte)(pixel >> 16); |
| 122 | g = (jubyte)(pixel >> 8); |
| 123 | b = (jubyte)(pixel >> 0); |
| 124 | a = (jubyte)(pixel >> 24); |
| 125 | |
| 126 | J2dTraceLn4(J2D_TRACE_VERBOSE, |
| 127 | " updating color: r=%02x g=%02x b=%02x a=%02x", |
| 128 | r, g, b, a); |
| 129 | } else { |
| 130 | pixel ^= oglc->xorPixel; |
| 131 | |
| 132 | r = (jubyte)(pixel >> 16); |
| 133 | g = (jubyte)(pixel >> 8); |
| 134 | b = (jubyte)(pixel >> 0); |
| 135 | a = 0xff; |
| 136 | |
| 137 | J2dTraceLn4(J2D_TRACE_VERBOSE, |
| 138 | " updating xor color: r=%02x g=%02x b=%02x xorpixel=%08x", |
| 139 | r, g, b, oglc->xorPixel); |
| 140 | } |
| 141 | |
| 142 | j2d_glColor4ub(r, g, b, a); |
| 143 | oglc->r = r; |
| 144 | oglc->g = g; |
| 145 | oglc->b = b; |
| 146 | oglc->a = a; |
| 147 | oglc->useMask = JNI_FALSE; |
| 148 | oglc->paintState = sun_java2d_SunGraphics2D_PAINT_ALPHACOLOR; |
| 149 | } |
| 150 | |
| 151 | /************************* GradientPaint support ****************************/ |
| 152 | |
| 153 | static GLuint gradientTexID = 0; |
| 154 | |
| 155 | static void |
| 156 | OGLPaints_InitGradientTexture() |
| 157 | { |
| 158 | GLclampf priority = 1.0f; |
| 159 | |
| 160 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_InitGradientTexture"); |
| 161 | |
| 162 | j2d_glGenTextures(1, &gradientTexID); |
| 163 | j2d_glBindTexture(GL_TEXTURE_1D, gradientTexID); |
| 164 | j2d_glPrioritizeTextures(1, &gradientTexID, &priority); |
| 165 | j2d_glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| 166 | j2d_glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| 167 | j2d_glTexImage1D(GL_TEXTURE_1D, 0, |
| 168 | GL_RGBA8, 2, 0, |
| 169 | GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL); |
| 170 | } |
| 171 | |
| 172 | void |
| 173 | OGLPaints_SetGradientPaint(OGLContext *oglc, |
| 174 | jboolean useMask, jboolean cyclic, |
| 175 | jdouble p0, jdouble p1, jdouble p3, |
| 176 | jint pixel1, jint pixel2) |
| 177 | { |
| 178 | GLdouble texParams[4]; |
| 179 | GLuint pixels[2]; |
| 180 | |
| 181 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_SetGradientPaint"); |
| 182 | |
| 183 | RETURN_IF_NULL(oglc); |
| 184 | OGLPaints_ResetPaint(oglc); |
| 185 | |
| 186 | texParams[0] = p0; |
| 187 | texParams[1] = p1; |
| 188 | texParams[2] = 0.0; |
| 189 | texParams[3] = p3; |
| 190 | |
| 191 | pixels[0] = pixel1; |
| 192 | pixels[1] = pixel2; |
| 193 | |
| 194 | if (useMask) { |
| 195 | // set up the paint on texture unit 1 (instead of the usual unit 0) |
| 196 | j2d_glActiveTextureARB(GL_TEXTURE1_ARB); |
| 197 | j2d_glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| 198 | } else { |
| 199 | // texture unit 0 is already active; we can use the helper macro here |
| 200 | OGLC_UPDATE_TEXTURE_FUNCTION(oglc, GL_MODULATE); |
| 201 | } |
| 202 | |
| 203 | if (gradientTexID == 0) { |
| 204 | OGLPaints_InitGradientTexture(); |
| 205 | } |
| 206 | |
| 207 | j2d_glEnable(GL_TEXTURE_1D); |
| 208 | j2d_glEnable(GL_TEXTURE_GEN_S); |
| 209 | j2d_glBindTexture(GL_TEXTURE_1D, gradientTexID); |
| 210 | j2d_glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, |
| 211 | cyclic ? GL_REPEAT : GL_CLAMP_TO_EDGE); |
| 212 | j2d_glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); |
| 213 | j2d_glTexGendv(GL_S, GL_OBJECT_PLANE, texParams); |
| 214 | |
| 215 | j2d_glTexSubImage1D(GL_TEXTURE_1D, 0, |
| 216 | 0, 2, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, pixels); |
| 217 | |
| 218 | if (useMask) { |
| 219 | // restore control to texture unit 0 |
| 220 | j2d_glActiveTextureARB(GL_TEXTURE0_ARB); |
| 221 | } |
| 222 | |
| 223 | // oglc->pixel has been set appropriately in OGLPaints_ResetPaint() |
| 224 | oglc->useMask = useMask; |
| 225 | oglc->paintState = sun_java2d_SunGraphics2D_PAINT_GRADIENT; |
| 226 | } |
| 227 | |
| 228 | /************************** TexturePaint support ****************************/ |
| 229 | |
| 230 | void |
| 231 | OGLPaints_SetTexturePaint(OGLContext *oglc, |
| 232 | jboolean useMask, |
| 233 | jlong pSrcOps, jboolean filter, |
| 234 | jdouble xp0, jdouble xp1, jdouble xp3, |
| 235 | jdouble yp0, jdouble yp1, jdouble yp3) |
| 236 | { |
| 237 | OGLSDOps *srcOps = (OGLSDOps *)jlong_to_ptr(pSrcOps); |
| 238 | GLdouble xParams[4]; |
| 239 | GLdouble yParams[4]; |
| 240 | GLint hint = (filter ? GL_LINEAR : GL_NEAREST); |
| 241 | |
| 242 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_SetTexturePaint"); |
| 243 | |
| 244 | RETURN_IF_NULL(srcOps); |
| 245 | RETURN_IF_NULL(oglc); |
| 246 | OGLPaints_ResetPaint(oglc); |
| 247 | |
| 248 | xParams[0] = xp0; |
| 249 | xParams[1] = xp1; |
| 250 | xParams[2] = 0.0; |
| 251 | xParams[3] = xp3; |
| 252 | |
| 253 | yParams[0] = yp0; |
| 254 | yParams[1] = yp1; |
| 255 | yParams[2] = 0.0; |
| 256 | yParams[3] = yp3; |
| 257 | |
| 258 | /* |
| 259 | * Note that we explicitly use GL_TEXTURE_2D below rather than using |
| 260 | * srcOps->textureTarget. This is because the texture wrap mode employed |
| 261 | * here (GL_REPEAT) is not available for GL_TEXTURE_RECTANGLE_ARB targets. |
| 262 | * The setup code in OGLPaints.Texture.isPaintValid() and in |
| 263 | * OGLSurfaceData.initTexture() ensures that we only get here for |
| 264 | * GL_TEXTURE_2D targets. |
| 265 | */ |
| 266 | |
| 267 | if (useMask) { |
| 268 | // set up the paint on texture unit 1 (instead of the usual unit 0) |
| 269 | j2d_glActiveTextureARB(GL_TEXTURE1_ARB); |
| 270 | j2d_glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| 271 | } else { |
| 272 | // texture unit 0 is already active; we can use the helper macro here |
| 273 | OGLC_UPDATE_TEXTURE_FUNCTION(oglc, GL_MODULATE); |
| 274 | } |
| 275 | |
| 276 | j2d_glEnable(GL_TEXTURE_2D); |
| 277 | j2d_glEnable(GL_TEXTURE_GEN_S); |
| 278 | j2d_glEnable(GL_TEXTURE_GEN_T); |
| 279 | j2d_glBindTexture(GL_TEXTURE_2D, srcOps->textureID); |
| 280 | OGLSD_UPDATE_TEXTURE_FILTER(srcOps, hint); |
| 281 | OGLSD_UPDATE_TEXTURE_WRAP(GL_TEXTURE_2D, GL_REPEAT); |
| 282 | j2d_glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); |
| 283 | j2d_glTexGendv(GL_S, GL_OBJECT_PLANE, xParams); |
| 284 | j2d_glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); |
| 285 | j2d_glTexGendv(GL_T, GL_OBJECT_PLANE, yParams); |
| 286 | |
| 287 | if (useMask) { |
| 288 | // restore control to texture unit 0 |
| 289 | j2d_glActiveTextureARB(GL_TEXTURE0_ARB); |
| 290 | } |
| 291 | |
| 292 | // oglc->pixel has been set appropriately in OGLPaints_ResetPaint() |
| 293 | oglc->useMask = useMask; |
| 294 | oglc->paintState = sun_java2d_SunGraphics2D_PAINT_TEXTURE; |
| 295 | } |
| 296 | |
| 297 | /****************** Shared MultipleGradientPaint support ********************/ |
| 298 | |
| 299 | /** |
| 300 | * These constants are identical to those defined in the |
| 301 | * MultipleGradientPaint.CycleMethod enum; they are copied here for |
| 302 | * convenience (ideally we would pull them directly from the Java level, |
| 303 | * but that entails more hassle than it is worth). |
| 304 | */ |
| 305 | #define CYCLE_NONE 0 |
| 306 | #define CYCLE_REFLECT 1 |
| 307 | #define CYCLE_REPEAT 2 |
| 308 | |
| 309 | /** |
| 310 | * The following constants are flags that can be bitwise-or'ed together |
| 311 | * to control how the MultipleGradientPaint shader source code is generated: |
| 312 | * |
| 313 | * MULTI_CYCLE_METHOD |
| 314 | * Placeholder for the CycleMethod enum constant. |
| 315 | * |
| 316 | * MULTI_LARGE |
| 317 | * If set, use the (slower) shader that supports a larger number of |
| 318 | * gradient colors; otherwise, use the optimized codepath. See |
| 319 | * the MAX_FRACTIONS_SMALL/LARGE constants below for more details. |
| 320 | * |
| 321 | * MULTI_USE_MASK |
| 322 | * If set, apply the alpha mask value from texture unit 0 to the |
| 323 | * final color result (only used in the MaskFill case). |
| 324 | * |
| 325 | * MULTI_LINEAR_RGB |
| 326 | * If set, convert the linear RGB result back into the sRGB color space. |
| 327 | */ |
| 328 | #define MULTI_CYCLE_METHOD (3 << 0) |
| 329 | #define MULTI_LARGE (1 << 2) |
| 330 | #define MULTI_USE_MASK (1 << 3) |
| 331 | #define MULTI_LINEAR_RGB (1 << 4) |
| 332 | |
| 333 | /** |
| 334 | * This value determines the size of the array of programs for each |
| 335 | * MultipleGradientPaint type. This value reflects the maximum value that |
| 336 | * can be represented by performing a bitwise-or of all the MULTI_* |
| 337 | * constants defined above. |
| 338 | */ |
| 339 | #define MAX_PROGRAMS 32 |
| 340 | |
| 341 | /** Evaluates to true if the given bit is set on the local flags variable. */ |
| 342 | #define IS_SET(flagbit) \ |
| 343 | (((flags) & (flagbit)) != 0) |
| 344 | |
| 345 | /** Composes the given parameters as flags into the given flags variable.*/ |
| 346 | #define COMPOSE_FLAGS(flags, cycleMethod, large, useMask, linear) \ |
| 347 | do { \ |
| 348 | flags |= ((cycleMethod) & MULTI_CYCLE_METHOD); \ |
| 349 | if (large) flags |= MULTI_LARGE; \ |
| 350 | if (useMask) flags |= MULTI_USE_MASK; \ |
| 351 | if (linear) flags |= MULTI_LINEAR_RGB; \ |
| 352 | } while (0) |
| 353 | |
| 354 | /** Extracts the CycleMethod enum value from the given flags variable. */ |
| 355 | #define EXTRACT_CYCLE_METHOD(flags) \ |
| 356 | ((flags) & MULTI_CYCLE_METHOD) |
| 357 | |
| 358 | /** |
| 359 | * The maximum number of gradient "stops" supported by the fragment shader |
| 360 | * and related code. When the MULTI_LARGE flag is set, we will use |
| 361 | * MAX_FRACTIONS_LARGE; otherwise, we use MAX_FRACTIONS_SMALL. By having |
| 362 | * two separate values, we can have one highly optimized shader (SMALL) that |
| 363 | * supports only a few fractions/colors, and then another, less optimal |
| 364 | * shader that supports more stops. |
| 365 | */ |
| 366 | #define MAX_FRACTIONS sun_java2d_pipe_BufferedPaints_MULTI_MAX_FRACTIONS |
| 367 | #define MAX_FRACTIONS_LARGE MAX_FRACTIONS |
| 368 | #define MAX_FRACTIONS_SMALL 4 |
| 369 | |
| 370 | /** |
| 371 | * The maximum number of gradient colors supported by all of the gradient |
| 372 | * fragment shaders. Note that this value must be a power of two, as it |
| 373 | * determines the size of the 1D texture created below. It also must be |
| 374 | * greater than or equal to MAX_FRACTIONS (there is no strict requirement |
| 375 | * that the two values be equal). |
| 376 | */ |
| 377 | #define MAX_COLORS 16 |
| 378 | |
| 379 | /** |
| 380 | * The handle to the gradient color table texture object used by the shaders. |
| 381 | */ |
| 382 | static GLuint multiGradientTexID = 0; |
| 383 | |
| 384 | /** |
| 385 | * This is essentially a template of the shader source code that can be used |
| 386 | * for either LinearGradientPaint or RadialGradientPaint. It includes the |
| 387 | * structure and some variables that are common to each; the remaining |
| 388 | * code snippets (for CycleMethod, ColorSpaceType, and mask modulation) |
| 389 | * are filled in prior to compiling the shader at runtime depending on the |
| 390 | * paint parameters. See OGLPaints_CreateMultiGradProgram() for more details. |
| 391 | */ |
| 392 | static const char *multiGradientShaderSource = |
| 393 | // gradient texture size (in texels) |
| 394 | "const int TEXTURE_SIZE = %d;" |
| 395 | // maximum number of fractions/colors supported by this shader |
| 396 | "const int MAX_FRACTIONS = %d;" |
| 397 | // size of a single texel |
| 398 | "const float FULL_TEXEL = (1.0 / float(TEXTURE_SIZE));" |
| 399 | // size of half of a single texel |
| 400 | "const float HALF_TEXEL = (FULL_TEXEL / 2.0);" |
| 401 | // texture containing the gradient colors |
| 402 | "uniform sampler1D colors;" |
| 403 | // array of gradient stops/fractions |
| 404 | "uniform float fractions[MAX_FRACTIONS];" |
| 405 | // array of scale factors (one for each interval) |
| 406 | "uniform float scaleFactors[MAX_FRACTIONS-1];" |
| 407 | // (placeholder for mask variable) |
| 408 | "%s" |
| 409 | // (placeholder for Linear/RadialGP-specific variables) |
| 410 | "%s" |
| 411 | "" |
| 412 | "void main(void)" |
| 413 | "{" |
| 414 | " float dist;" |
| 415 | // (placeholder for Linear/RadialGradientPaint-specific code) |
| 416 | " %s" |
| 417 | "" |
| 418 | " float tc;" |
| 419 | // (placeholder for CycleMethod-specific code) |
| 420 | " %s" |
| 421 | "" |
| 422 | // calculate interpolated color |
| 423 | " vec4 result = texture1D(colors, tc);" |
| 424 | "" |
| 425 | // (placeholder for ColorSpace conversion code) |
| 426 | " %s" |
| 427 | "" |
| 428 | // (placeholder for mask modulation code) |
| 429 | " %s" |
| 430 | "" |
| 431 | // modulate with gl_Color in order to apply extra alpha |
| 432 | " gl_FragColor = result * gl_Color;" |
| 433 | "}"; |
| 434 | |
| 435 | /** |
| 436 | * This code takes a "dist" value as input (as calculated earlier by the |
| 437 | * LGP/RGP-specific code) in the range [0,1] and produces a texture |
| 438 | * coordinate value "tc" that represents the position of the chosen color |
| 439 | * in the one-dimensional gradient texture (also in the range [0,1]). |
| 440 | * |
| 441 | * One naive way to implement this would be to iterate through the fractions |
| 442 | * to figure out in which interval "dist" falls, and then compute the |
| 443 | * relative distance between the two nearest stops. This approach would |
| 444 | * require an "if" check on every iteration, and it is best to avoid |
| 445 | * conditionals in fragment shaders for performance reasons. Also, one might |
| 446 | * be tempted to use a break statement to jump out of the loop once the |
| 447 | * interval was found, but break statements (and non-constant loop bounds) |
| 448 | * are not natively available on most graphics hardware today, so that is |
| 449 | * a non-starter. |
| 450 | * |
| 451 | * The more optimal approach used here avoids these issues entirely by using |
| 452 | * an accumulation function that is equivalent to the process described above. |
| 453 | * The scaleFactors array is pre-initialized at enable time as follows: |
| 454 | * scaleFactors[i] = 1.0 / (fractions[i+1] - fractions[i]); |
| 455 | * |
| 456 | * For each iteration, we subtract fractions[i] from dist and then multiply |
| 457 | * that value by scaleFactors[i]. If we are within the target interval, |
| 458 | * this value will be a fraction in the range [0,1] indicating the relative |
| 459 | * distance between fraction[i] and fraction[i+1]. If we are below the |
| 460 | * target interval, this value will be negative, so we clamp it to zero |
| 461 | * to avoid accumulating any value. If we are above the target interval, |
| 462 | * the value will be greater than one, so we clamp it to one. Upon exiting |
| 463 | * the loop, we will have accumulated zero or more 1.0's and a single |
| 464 | * fractional value. This accumulated value tells us the position of the |
| 465 | * fragment color in the one-dimensional gradient texture, i.e., the |
| 466 | * texcoord called "tc". |
| 467 | */ |
| 468 | static const char *texCoordCalcCode = |
| 469 | "int i;" |
| 470 | "float relFraction = 0.0;" |
| 471 | "for (i = 0; i < MAX_FRACTIONS-1; i++) {" |
| 472 | " relFraction +=" |
| 473 | " clamp((dist - fractions[i]) * scaleFactors[i], 0.0, 1.0);" |
| 474 | "}" |
| 475 | // we offset by half a texel so that we find the linearly interpolated |
| 476 | // color between the two texel centers of interest |
| 477 | "tc = HALF_TEXEL + (FULL_TEXEL * relFraction);"; |
| 478 | |
| 479 | /** Code for NO_CYCLE that gets plugged into the CycleMethod placeholder. */ |
| 480 | static const char *noCycleCode = |
| 481 | "if (dist <= 0.0) {" |
| 482 | " tc = 0.0;" |
| 483 | "} else if (dist >= 1.0) {" |
| 484 | " tc = 1.0;" |
| 485 | "} else {" |
| 486 | // (placeholder for texcoord calculation) |
| 487 | " %s" |
| 488 | "}"; |
| 489 | |
| 490 | /** Code for REFLECT that gets plugged into the CycleMethod placeholder. */ |
| 491 | static const char *reflectCode = |
| 492 | "dist = 1.0 - (abs(fract(dist * 0.5) - 0.5) * 2.0);" |
| 493 | // (placeholder for texcoord calculation) |
| 494 | "%s"; |
| 495 | |
| 496 | /** Code for REPEAT that gets plugged into the CycleMethod placeholder. */ |
| 497 | static const char *repeatCode = |
| 498 | "dist = fract(dist);" |
| 499 | // (placeholder for texcoord calculation) |
| 500 | "%s"; |
| 501 | |
| 502 | static void |
| 503 | OGLPaints_InitMultiGradientTexture() |
| 504 | { |
| 505 | GLclampf priority = 1.0f; |
| 506 | |
| 507 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_InitMultiGradientTexture"); |
| 508 | |
| 509 | j2d_glGenTextures(1, &multiGradientTexID); |
| 510 | j2d_glBindTexture(GL_TEXTURE_1D, multiGradientTexID); |
| 511 | j2d_glPrioritizeTextures(1, &multiGradientTexID, &priority); |
| 512 | j2d_glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| 513 | j2d_glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| 514 | j2d_glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
| 515 | j2d_glTexImage1D(GL_TEXTURE_1D, 0, |
| 516 | GL_RGBA8, MAX_COLORS, 0, |
| 517 | GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, NULL); |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * Compiles and links the MultipleGradientPaint shader program. If |
| 522 | * successful, this function returns a handle to the newly created |
| 523 | * shader program; otherwise returns 0. |
| 524 | */ |
| 525 | static GLhandleARB |
| 526 | OGLPaints_CreateMultiGradProgram(jint flags, |
| 527 | char *paintVars, char *distCode) |
| 528 | { |
| 529 | GLhandleARB multiGradProgram; |
| 530 | GLint loc; |
| 531 | char *maskVars = ""; |
| 532 | char *maskCode = ""; |
| 533 | char *colorSpaceCode = ""; |
| 534 | char cycleCode[1500]; |
| 535 | char finalSource[3000]; |
| 536 | jint cycleMethod = EXTRACT_CYCLE_METHOD(flags); |
| 537 | jint maxFractions = IS_SET(MULTI_LARGE) ? |
| 538 | MAX_FRACTIONS_LARGE : MAX_FRACTIONS_SMALL; |
| 539 | |
| 540 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_CreateMultiGradProgram"); |
| 541 | |
| 542 | if (IS_SET(MULTI_USE_MASK)) { |
| 543 | /* |
| 544 | * This code modulates the calculated result color with the |
| 545 | * corresponding alpha value from the alpha mask texture active |
| 546 | * on texture unit 0. Only needed when useMask is true (i.e., only |
| 547 | * for MaskFill operations). |
| 548 | */ |
| 549 | maskVars = "uniform sampler2D mask;"; |
| 550 | maskCode = "result *= texture2D(mask, gl_TexCoord[0].st);"; |
| 551 | } else { |
| 552 | /* |
| 553 | * REMIND: This is really wacky, but the gradient shaders will |
| 554 | * produce completely incorrect results on ATI hardware (at least |
| 555 | * on first-gen (R300-based) boards) if the shader program does not |
| 556 | * try to access texture coordinates by using a gl_TexCoord[*] |
| 557 | * variable. This problem really should be addressed by ATI, but |
| 558 | * in the meantime it seems we can workaround the issue by inserting |
| 559 | * a benign operation that accesses gl_TexCoord[0]. Note that we |
| 560 | * only need to do this for ATI boards and only in the !useMask case, |
| 561 | * because the useMask case already does access gl_TexCoord[1] and |
| 562 | * is therefore not affected by this driver bug. |
| 563 | */ |
| 564 | const char *vendor = (const char *)j2d_glGetString(GL_VENDOR); |
| 565 | if (vendor != NULL && strncmp(vendor, "ATI", 3) == 0) { |
| 566 | maskCode = "dist = gl_TexCoord[0].s;"; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | if (IS_SET(MULTI_LINEAR_RGB)) { |
| 571 | /* |
| 572 | * This code converts a single pixel in linear RGB space back |
| 573 | * into sRGB (note: this code was adapted from the |
| 574 | * MultipleGradientPaintContext.convertLinearRGBtoSRGB() method). |
| 575 | */ |
| 576 | colorSpaceCode = |
| 577 | "result.rgb = 1.055 * pow(result.rgb, vec3(0.416667)) - 0.055;"; |
| 578 | } |
| 579 | |
| 580 | if (cycleMethod == CYCLE_NONE) { |
| 581 | sprintf(cycleCode, noCycleCode, texCoordCalcCode); |
| 582 | } else if (cycleMethod == CYCLE_REFLECT) { |
| 583 | sprintf(cycleCode, reflectCode, texCoordCalcCode); |
| 584 | } else { // (cycleMethod == CYCLE_REPEAT) |
| 585 | sprintf(cycleCode, repeatCode, texCoordCalcCode); |
| 586 | } |
| 587 | |
| 588 | // compose the final source code string from the various pieces |
| 589 | sprintf(finalSource, multiGradientShaderSource, |
| 590 | MAX_COLORS, maxFractions, |
| 591 | maskVars, paintVars, distCode, |
| 592 | cycleCode, colorSpaceCode, maskCode); |
| 593 | |
| 594 | multiGradProgram = OGLContext_CreateFragmentProgram(finalSource); |
| 595 | if (multiGradProgram == 0) { |
| 596 | J2dRlsTraceLn(J2D_TRACE_ERROR, |
| 597 | "OGLPaints_CreateMultiGradProgram: error creating program"); |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | // "use" the program object temporarily so that we can set the uniforms |
| 602 | j2d_glUseProgramObjectARB(multiGradProgram); |
| 603 | |
| 604 | // set the "uniform" texture unit bindings |
| 605 | if (IS_SET(MULTI_USE_MASK)) { |
| 606 | loc = j2d_glGetUniformLocationARB(multiGradProgram, "mask"); |
| 607 | j2d_glUniform1iARB(loc, 0); // texture unit 0 |
| 608 | loc = j2d_glGetUniformLocationARB(multiGradProgram, "colors"); |
| 609 | j2d_glUniform1iARB(loc, 1); // texture unit 1 |
| 610 | } else { |
| 611 | loc = j2d_glGetUniformLocationARB(multiGradProgram, "colors"); |
| 612 | j2d_glUniform1iARB(loc, 0); // texture unit 0 |
| 613 | } |
| 614 | |
| 615 | // "unuse" the program object; it will be re-bound later as needed |
| 616 | j2d_glUseProgramObjectARB(0); |
| 617 | |
| 618 | if (multiGradientTexID == 0) { |
| 619 | OGLPaints_InitMultiGradientTexture(); |
| 620 | } |
| 621 | |
| 622 | return multiGradProgram; |
| 623 | } |
| 624 | |
| 625 | /** |
| 626 | * Called from the OGLPaints_SetLinear/RadialGradientPaint() methods |
| 627 | * in order to setup the fraction/color values that are common to both. |
| 628 | */ |
| 629 | static void |
| 630 | OGLPaints_SetMultiGradientPaint(GLhandleARB multiGradProgram, |
| 631 | jint numStops, |
| 632 | void *pFractions, void *pPixels) |
| 633 | { |
| 634 | jint maxFractions = (numStops > MAX_FRACTIONS_SMALL) ? |
| 635 | MAX_FRACTIONS_LARGE : MAX_FRACTIONS_SMALL; |
| 636 | GLfloat scaleFactors[MAX_FRACTIONS-1]; |
| 637 | GLfloat *fractions = (GLfloat *)pFractions; |
| 638 | GLint *pixels = (GLint *)pPixels; |
| 639 | GLint loc; |
| 640 | int i; |
| 641 | |
| 642 | // enable the MultipleGradientPaint shader |
| 643 | j2d_glUseProgramObjectARB(multiGradProgram); |
| 644 | |
| 645 | // update the "uniform" fraction values |
| 646 | loc = j2d_glGetUniformLocationARB(multiGradProgram, "fractions"); |
| 647 | if (numStops < maxFractions) { |
| 648 | // fill the remainder of the fractions array with all zeros to |
| 649 | // prevent using garbage values from previous paints |
| 650 | GLfloat allZeros[MAX_FRACTIONS]; |
| 651 | memset(allZeros, 0, sizeof(GLfloat)*MAX_FRACTIONS); |
| 652 | j2d_glUniform1fvARB(loc, maxFractions, allZeros); |
| 653 | } |
| 654 | j2d_glUniform1fvARB(loc, numStops, fractions); |
| 655 | |
| 656 | // update the "uniform" scale values |
| 657 | loc = j2d_glGetUniformLocationARB(multiGradProgram, "scaleFactors"); |
| 658 | for (i = 0; i < numStops-1; i++) { |
| 659 | // calculate a scale factor for each interval |
| 660 | scaleFactors[i] = 1.0f / (fractions[i+1] - fractions[i]); |
| 661 | } |
| 662 | for (; i < maxFractions-1; i++) { |
| 663 | // fill remaining scale factors with zero |
| 664 | scaleFactors[i] = 0.0f; |
| 665 | } |
| 666 | j2d_glUniform1fvARB(loc, maxFractions-1, scaleFactors); |
| 667 | |
| 668 | // update the texture containing the gradient colors |
| 669 | j2d_glEnable(GL_TEXTURE_1D); |
| 670 | j2d_glBindTexture(GL_TEXTURE_1D, multiGradientTexID); |
| 671 | j2d_glTexSubImage1D(GL_TEXTURE_1D, 0, |
| 672 | 0, numStops, |
| 673 | GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, |
| 674 | pixels); |
| 675 | if (numStops < MAX_COLORS) { |
| 676 | // when we don't have enough colors to fill the entire color gradient, |
| 677 | // we have to replicate the last color in the right-most texel for |
| 678 | // the NO_CYCLE case where the texcoord is sometimes forced to 1.0 |
| 679 | j2d_glTexSubImage1D(GL_TEXTURE_1D, 0, |
| 680 | MAX_COLORS-1, 1, |
| 681 | GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, |
| 682 | pixels+(numStops-1)); |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | /********************** LinearGradientPaint support *************************/ |
| 687 | |
| 688 | /** |
| 689 | * The handles to the LinearGradientPaint fragment program objects. The |
| 690 | * index to the array should be a bitwise-or'ing of the MULTI_* flags defined |
| 691 | * above. Note that most applications will likely need to initialize one |
| 692 | * or two of these elements, so the array is usually sparsely populated. |
| 693 | */ |
| 694 | static GLhandleARB linearGradPrograms[MAX_PROGRAMS]; |
| 695 | |
| 696 | /** |
| 697 | * Compiles and links the LinearGradientPaint shader program. If successful, |
| 698 | * this function returns a handle to the newly created shader program; |
| 699 | * otherwise returns 0. |
| 700 | */ |
| 701 | static GLhandleARB |
| 702 | OGLPaints_CreateLinearGradProgram(jint flags) |
| 703 | { |
| 704 | char *paintVars; |
| 705 | char *distCode; |
| 706 | |
| 707 | J2dTraceLn1(J2D_TRACE_INFO, |
| 708 | "OGLPaints_CreateLinearGradProgram", |
| 709 | flags); |
| 710 | |
| 711 | /* |
| 712 | * To simplify the code and to make it easier to upload a number of |
| 713 | * uniform values at once, we pack a bunch of scalar (float) values |
| 714 | * into vec3 values below. Here's how the values are related: |
| 715 | * |
| 716 | * params.x = p0 |
| 717 | * params.y = p1 |
| 718 | * params.z = p3 |
| 719 | * |
| 720 | * yoff = dstOps->yOffset + dstOps->height |
| 721 | */ |
| 722 | paintVars = |
| 723 | "uniform vec3 params;" |
| 724 | "uniform float yoff;"; |
| 725 | distCode = |
| 726 | // note that gl_FragCoord is in window space relative to the |
| 727 | // lower-left corner, so we have to flip the y-coordinate here |
| 728 | "vec3 fragCoord = vec3(gl_FragCoord.x, yoff-gl_FragCoord.y, 1.0);" |
| 729 | "dist = dot(params, fragCoord);"; |
| 730 | |
| 731 | return OGLPaints_CreateMultiGradProgram(flags, paintVars, distCode); |
| 732 | } |
| 733 | |
| 734 | void |
| 735 | OGLPaints_SetLinearGradientPaint(OGLContext *oglc, OGLSDOps *dstOps, |
| 736 | jboolean useMask, jboolean linear, |
| 737 | jint cycleMethod, jint numStops, |
| 738 | jfloat p0, jfloat p1, jfloat p3, |
| 739 | void *fractions, void *pixels) |
| 740 | { |
| 741 | GLhandleARB linearGradProgram; |
| 742 | GLint loc; |
| 743 | jboolean large = (numStops > MAX_FRACTIONS_SMALL); |
| 744 | jint flags = 0; |
| 745 | |
| 746 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_SetLinearGradientPaint"); |
| 747 | |
| 748 | RETURN_IF_NULL(oglc); |
| 749 | RETURN_IF_NULL(dstOps); |
| 750 | OGLPaints_ResetPaint(oglc); |
| 751 | |
| 752 | COMPOSE_FLAGS(flags, cycleMethod, large, useMask, linear); |
| 753 | |
| 754 | if (useMask) { |
| 755 | // set up the paint on texture unit 1 (instead of the usual unit 0) |
| 756 | j2d_glActiveTextureARB(GL_TEXTURE1_ARB); |
| 757 | } |
| 758 | // no need to set GL_MODULATE here (it is ignored when shader is enabled) |
| 759 | |
| 760 | // locate/initialize the shader program for the given flags |
| 761 | if (linearGradPrograms[flags] == 0) { |
| 762 | linearGradPrograms[flags] = OGLPaints_CreateLinearGradProgram(flags); |
| 763 | if (linearGradPrograms[flags] == 0) { |
| 764 | // shouldn't happen, but just in case... |
| 765 | return; |
| 766 | } |
| 767 | } |
| 768 | linearGradProgram = linearGradPrograms[flags]; |
| 769 | |
| 770 | // update the common "uniform" values (fractions and colors) |
| 771 | OGLPaints_SetMultiGradientPaint(linearGradProgram, |
| 772 | numStops, fractions, pixels); |
| 773 | |
| 774 | // update the other "uniform" values |
| 775 | loc = j2d_glGetUniformLocationARB(linearGradProgram, "params"); |
| 776 | j2d_glUniform3fARB(loc, p0, p1, p3); |
| 777 | loc = j2d_glGetUniformLocationARB(linearGradProgram, "yoff"); |
| 778 | j2d_glUniform1fARB(loc, (GLfloat)(dstOps->yOffset + dstOps->height)); |
| 779 | |
| 780 | if (useMask) { |
| 781 | // restore control to texture unit 0 |
| 782 | j2d_glActiveTextureARB(GL_TEXTURE0_ARB); |
| 783 | } |
| 784 | |
| 785 | // oglc->pixel has been set appropriately in OGLPaints_ResetPaint() |
| 786 | oglc->useMask = useMask; |
| 787 | oglc->paintState = sun_java2d_SunGraphics2D_PAINT_LIN_GRADIENT; |
| 788 | } |
| 789 | |
| 790 | /********************** RadialGradientPaint support *************************/ |
| 791 | |
| 792 | /** |
| 793 | * The handles to the RadialGradientPaint fragment program objects. The |
| 794 | * index to the array should be a bitwise-or'ing of the MULTI_* flags defined |
| 795 | * above. Note that most applications will likely need to initialize one |
| 796 | * or two of these elements, so the array is usually sparsely populated. |
| 797 | */ |
| 798 | static GLhandleARB radialGradPrograms[MAX_PROGRAMS]; |
| 799 | |
| 800 | /** |
| 801 | * Compiles and links the RadialGradientPaint shader program. If successful, |
| 802 | * this function returns a handle to the newly created shader program; |
| 803 | * otherwise returns 0. |
| 804 | */ |
| 805 | static GLhandleARB |
| 806 | OGLPaints_CreateRadialGradProgram(jint flags) |
| 807 | { |
| 808 | char *paintVars; |
| 809 | char *distCode; |
| 810 | |
| 811 | J2dTraceLn1(J2D_TRACE_INFO, |
| 812 | "OGLPaints_CreateRadialGradProgram", |
| 813 | flags); |
| 814 | |
| 815 | /* |
| 816 | * To simplify the code and to make it easier to upload a number of |
| 817 | * uniform values at once, we pack a bunch of scalar (float) values |
| 818 | * into vec3 and vec4 values below. Here's how the values are related: |
| 819 | * |
| 820 | * m0.x = m00 |
| 821 | * m0.y = m01 |
| 822 | * m0.z = m02 |
| 823 | * |
| 824 | * m1.x = m10 |
| 825 | * m1.y = m11 |
| 826 | * m1.z = m12 |
| 827 | * |
| 828 | * precalc.x = focusX |
| 829 | * precalc.y = yoff = dstOps->yOffset + dstOps->height |
| 830 | * precalc.z = 1.0 - (focusX * focusX) |
| 831 | * precalc.w = 1.0 / precalc.z |
| 832 | */ |
| 833 | paintVars = |
| 834 | "uniform vec3 m0;" |
| 835 | "uniform vec3 m1;" |
| 836 | "uniform vec4 precalc;"; |
| 837 | |
| 838 | /* |
| 839 | * The following code is derived from Daniel Rice's whitepaper on |
| 840 | * radial gradient performance (attached to the bug report for 6521533). |
| 841 | * Refer to that document as well as the setup code in the Java-level |
| 842 | * BufferedPaints.setRadialGradientPaint() method for more details. |
| 843 | */ |
| 844 | distCode = |
| 845 | // note that gl_FragCoord is in window space relative to the |
| 846 | // lower-left corner, so we have to flip the y-coordinate here |
| 847 | "vec3 fragCoord =" |
| 848 | " vec3(gl_FragCoord.x, precalc.y - gl_FragCoord.y, 1.0);" |
| 849 | "float x = dot(fragCoord, m0);" |
| 850 | "float y = dot(fragCoord, m1);" |
| 851 | "float xfx = x - precalc.x;" |
| 852 | "dist = (precalc.x*xfx + sqrt(xfx*xfx + y*y*precalc.z))*precalc.w;"; |
| 853 | |
| 854 | return OGLPaints_CreateMultiGradProgram(flags, paintVars, distCode); |
| 855 | } |
| 856 | |
| 857 | void |
| 858 | OGLPaints_SetRadialGradientPaint(OGLContext *oglc, OGLSDOps *dstOps, |
| 859 | jboolean useMask, jboolean linear, |
| 860 | jint cycleMethod, jint numStops, |
| 861 | jfloat m00, jfloat m01, jfloat m02, |
| 862 | jfloat m10, jfloat m11, jfloat m12, |
| 863 | jfloat focusX, |
| 864 | void *fractions, void *pixels) |
| 865 | { |
| 866 | GLhandleARB radialGradProgram; |
| 867 | GLint loc; |
| 868 | GLfloat yoff, denom, inv_denom; |
| 869 | jboolean large = (numStops > MAX_FRACTIONS_SMALL); |
| 870 | jint flags = 0; |
| 871 | |
| 872 | J2dTraceLn(J2D_TRACE_INFO, "OGLPaints_SetRadialGradientPaint"); |
| 873 | |
| 874 | RETURN_IF_NULL(oglc); |
| 875 | RETURN_IF_NULL(dstOps); |
| 876 | OGLPaints_ResetPaint(oglc); |
| 877 | |
| 878 | COMPOSE_FLAGS(flags, cycleMethod, large, useMask, linear); |
| 879 | |
| 880 | if (useMask) { |
| 881 | // set up the paint on texture unit 1 (instead of the usual unit 0) |
| 882 | j2d_glActiveTextureARB(GL_TEXTURE1_ARB); |
| 883 | } |
| 884 | // no need to set GL_MODULATE here (it is ignored when shader is enabled) |
| 885 | |
| 886 | // locate/initialize the shader program for the given flags |
| 887 | if (radialGradPrograms[flags] == 0) { |
| 888 | radialGradPrograms[flags] = OGLPaints_CreateRadialGradProgram(flags); |
| 889 | if (radialGradPrograms[flags] == 0) { |
| 890 | // shouldn't happen, but just in case... |
| 891 | return; |
| 892 | } |
| 893 | } |
| 894 | radialGradProgram = radialGradPrograms[flags]; |
| 895 | |
| 896 | // update the common "uniform" values (fractions and colors) |
| 897 | OGLPaints_SetMultiGradientPaint(radialGradProgram, |
| 898 | numStops, fractions, pixels); |
| 899 | |
| 900 | // update the other "uniform" values |
| 901 | loc = j2d_glGetUniformLocationARB(radialGradProgram, "m0"); |
| 902 | j2d_glUniform3fARB(loc, m00, m01, m02); |
| 903 | loc = j2d_glGetUniformLocationARB(radialGradProgram, "m1"); |
| 904 | j2d_glUniform3fARB(loc, m10, m11, m12); |
| 905 | |
| 906 | // pack a few unrelated, precalculated values into a single vec4 |
| 907 | yoff = (GLfloat)(dstOps->yOffset + dstOps->height); |
| 908 | denom = 1.0f - (focusX * focusX); |
| 909 | inv_denom = 1.0f / denom; |
| 910 | loc = j2d_glGetUniformLocationARB(radialGradProgram, "precalc"); |
| 911 | j2d_glUniform4fARB(loc, focusX, yoff, denom, inv_denom); |
| 912 | |
| 913 | if (useMask) { |
| 914 | // restore control to texture unit 0 |
| 915 | j2d_glActiveTextureARB(GL_TEXTURE0_ARB); |
| 916 | } |
| 917 | |
| 918 | // oglc->pixel has been set appropriately in OGLPaints_ResetPaint() |
| 919 | oglc->useMask = useMask; |
| 920 | oglc->paintState = sun_java2d_SunGraphics2D_PAINT_RAD_GRADIENT; |
| 921 | } |
| 922 | |
| 923 | #endif /* !HEADLESS */ |