author | tdv |
Tue, 22 Jul 2008 11:24:32 -0700 | |
changeset 888 | c7009cf0001f |
parent 887 | 0aab8d3fa11a |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
2 | 1 |
/* |
888
c7009cf0001f
6728492: typo in copyrights in some files touched by the d3d pipeline port
tdv
parents:
887
diff
changeset
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* Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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||
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#ifndef HEADLESS |
|
27 |
||
28 |
#include <jlong.h> |
|
29 |
#include <jni_util.h> |
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887 | 30 |
#include <math.h> |
2 | 31 |
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32 |
#include "sun_java2d_opengl_OGLRenderer.h" |
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||
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#include "OGLRenderer.h" |
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#include "OGLRenderQueue.h" |
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#include "OGLSurfaceData.h" |
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37 |
||
38 |
/** |
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* Note: Some of the methods in this file apply a "magic number" |
|
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* translation to line segments. The OpenGL specification lays out the |
|
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* "diamond exit rule" for line rasterization, but it is loose enough to |
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* allow for a wide range of line rendering hardware. (It appears that |
|
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* some hardware, such as the Nvidia GeForce2 series, does not even meet |
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* the spec in all cases.) As such it is difficult to find a mapping |
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* between the Java2D and OpenGL line specs that works consistently across |
|
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* all hardware combinations. |
|
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* |
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* Therefore the "magic numbers" you see here have been empirically derived |
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* after testing on a variety of graphics hardware in order to find some |
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* reasonable middle ground between the two specifications. The general |
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* approach is to apply a fractional translation to vertices so that they |
|
52 |
* hit pixel centers and therefore touch the same pixels as in our other |
|
53 |
* pipelines. Emphasis was placed on finding values so that OGL lines with |
|
54 |
* a slope of +/- 1 hit all the same pixels as our other (software) loops. |
|
55 |
* The stepping in other diagonal lines rendered with OGL may deviate |
|
56 |
* slightly from those rendered with our software loops, but the most |
|
57 |
* important thing is that these magic numbers ensure that all OGL lines |
|
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* hit the same endpoints as our software loops. |
|
59 |
* |
|
60 |
* If you find it necessary to change any of these magic numbers in the |
|
61 |
* future, just be sure that you test the changes across a variety of |
|
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* hardware to ensure consistent rendering everywhere. |
|
63 |
*/ |
|
64 |
||
65 |
void |
|
66 |
OGLRenderer_DrawLine(OGLContext *oglc, jint x1, jint y1, jint x2, jint y2) |
|
67 |
{ |
|
68 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawLine"); |
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69 |
||
70 |
RETURN_IF_NULL(oglc); |
|
71 |
||
72 |
CHECK_PREVIOUS_OP(GL_LINES); |
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73 |
||
74 |
if (y1 == y2) { |
|
75 |
// horizontal |
|
76 |
GLfloat fx1 = (GLfloat)x1; |
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77 |
GLfloat fx2 = (GLfloat)x2; |
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78 |
GLfloat fy = ((GLfloat)y1) + 0.2f; |
|
79 |
||
80 |
if (x1 > x2) { |
|
81 |
GLfloat t = fx1; fx1 = fx2; fx2 = t; |
|
82 |
} |
|
83 |
||
84 |
j2d_glVertex2f(fx1+0.2f, fy); |
|
85 |
j2d_glVertex2f(fx2+1.2f, fy); |
|
86 |
} else if (x1 == x2) { |
|
87 |
// vertical |
|
88 |
GLfloat fx = ((GLfloat)x1) + 0.2f; |
|
89 |
GLfloat fy1 = (GLfloat)y1; |
|
90 |
GLfloat fy2 = (GLfloat)y2; |
|
91 |
||
92 |
if (y1 > y2) { |
|
93 |
GLfloat t = fy1; fy1 = fy2; fy2 = t; |
|
94 |
} |
|
95 |
||
96 |
j2d_glVertex2f(fx, fy1+0.2f); |
|
97 |
j2d_glVertex2f(fx, fy2+1.2f); |
|
98 |
} else { |
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99 |
// diagonal |
|
100 |
GLfloat fx1 = (GLfloat)x1; |
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101 |
GLfloat fy1 = (GLfloat)y1; |
|
102 |
GLfloat fx2 = (GLfloat)x2; |
|
103 |
GLfloat fy2 = (GLfloat)y2; |
|
104 |
||
105 |
if (x1 < x2) { |
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106 |
fx1 += 0.2f; |
|
107 |
fx2 += 1.0f; |
|
108 |
} else { |
|
109 |
fx1 += 0.8f; |
|
110 |
fx2 -= 0.2f; |
|
111 |
} |
|
112 |
||
113 |
if (y1 < y2) { |
|
114 |
fy1 += 0.2f; |
|
115 |
fy2 += 1.0f; |
|
116 |
} else { |
|
117 |
fy1 += 0.8f; |
|
118 |
fy2 -= 0.2f; |
|
119 |
} |
|
120 |
||
121 |
j2d_glVertex2f(fx1, fy1); |
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122 |
j2d_glVertex2f(fx2, fy2); |
|
123 |
} |
|
124 |
} |
|
125 |
||
126 |
void |
|
127 |
OGLRenderer_DrawRect(OGLContext *oglc, jint x, jint y, jint w, jint h) |
|
128 |
{ |
|
129 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawRect"); |
|
130 |
||
131 |
if (w < 0 || h < 0) { |
|
132 |
return; |
|
133 |
} |
|
134 |
||
135 |
RETURN_IF_NULL(oglc); |
|
136 |
||
137 |
if (w < 2 || h < 2) { |
|
138 |
// If one dimension is less than 2 then there is no |
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139 |
// gap in the middle - draw a solid filled rectangle. |
|
140 |
CHECK_PREVIOUS_OP(GL_QUADS); |
|
141 |
GLRECT_BODY_XYWH(x, y, w+1, h+1); |
|
142 |
} else { |
|
143 |
GLfloat fx1 = ((GLfloat)x) + 0.2f; |
|
144 |
GLfloat fy1 = ((GLfloat)y) + 0.2f; |
|
145 |
GLfloat fx2 = fx1 + ((GLfloat)w); |
|
146 |
GLfloat fy2 = fy1 + ((GLfloat)h); |
|
147 |
||
148 |
// Avoid drawing the endpoints twice. |
|
149 |
// Also prefer including the endpoints in the |
|
150 |
// horizontal sections which draw pixels faster. |
|
151 |
||
152 |
CHECK_PREVIOUS_OP(GL_LINES); |
|
153 |
// top |
|
154 |
j2d_glVertex2f(fx1, fy1); |
|
155 |
j2d_glVertex2f(fx2+1.0f, fy1); |
|
156 |
// right |
|
157 |
j2d_glVertex2f(fx2, fy1+1.0f); |
|
158 |
j2d_glVertex2f(fx2, fy2); |
|
159 |
// bottom |
|
160 |
j2d_glVertex2f(fx1, fy2); |
|
161 |
j2d_glVertex2f(fx2+1.0f, fy2); |
|
162 |
// left |
|
163 |
j2d_glVertex2f(fx1, fy1+1.0f); |
|
164 |
j2d_glVertex2f(fx1, fy2); |
|
165 |
} |
|
166 |
} |
|
167 |
||
168 |
void |
|
169 |
OGLRenderer_DrawPoly(OGLContext *oglc, |
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170 |
jint nPoints, jint isClosed, |
|
171 |
jint transX, jint transY, |
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172 |
jint *xPoints, jint *yPoints) |
|
173 |
{ |
|
174 |
jboolean isEmpty = JNI_TRUE; |
|
175 |
jint mx, my; |
|
176 |
jint i; |
|
177 |
||
178 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawPoly"); |
|
179 |
||
180 |
if (xPoints == NULL || yPoints == NULL) { |
|
181 |
J2dRlsTraceLn(J2D_TRACE_ERROR, |
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182 |
"OGLRenderer_DrawPoly: points array is null"); |
|
183 |
return; |
|
184 |
} |
|
185 |
||
186 |
RETURN_IF_NULL(oglc); |
|
187 |
||
188 |
// Note that BufferedRenderPipe.drawPoly() has already rejected polys |
|
189 |
// with nPoints<2, so we can be certain here that we have nPoints>=2. |
|
190 |
||
191 |
mx = xPoints[0]; |
|
192 |
my = yPoints[0]; |
|
193 |
||
194 |
CHECK_PREVIOUS_OP(GL_LINE_STRIP); |
|
195 |
for (i = 0; i < nPoints; i++) { |
|
196 |
jint x = xPoints[i]; |
|
197 |
jint y = yPoints[i]; |
|
198 |
||
199 |
isEmpty = isEmpty && (x == mx && y == my); |
|
200 |
||
201 |
// Translate each vertex by a fraction so that we hit pixel centers. |
|
202 |
j2d_glVertex2f((GLfloat)(x + transX) + 0.5f, |
|
203 |
(GLfloat)(y + transY) + 0.5f); |
|
204 |
} |
|
205 |
||
206 |
if (isClosed && !isEmpty && |
|
207 |
(xPoints[nPoints-1] != mx || |
|
208 |
yPoints[nPoints-1] != my)) |
|
209 |
{ |
|
210 |
// In this case, the polyline's start and end positions are |
|
211 |
// different and need to be closed manually; we do this by adding |
|
212 |
// one more segment back to the starting position. Note that we |
|
213 |
// do not need to fill in the last pixel (as we do in the following |
|
214 |
// block) because we are returning to the starting pixel, which |
|
215 |
// has already been filled in. |
|
216 |
j2d_glVertex2f((GLfloat)(mx + transX) + 0.5f, |
|
217 |
(GLfloat)(my + transY) + 0.5f); |
|
218 |
RESET_PREVIOUS_OP(); // so that we don't leave the line strip open |
|
219 |
} else if (!isClosed || isEmpty) { |
|
220 |
// OpenGL omits the last pixel in a polyline, so we fix this by |
|
221 |
// adding a one-pixel segment at the end. Also, if the polyline |
|
222 |
// never went anywhere (isEmpty is true), we need to use this |
|
223 |
// workaround to ensure that a single pixel is touched. |
|
224 |
CHECK_PREVIOUS_OP(GL_LINES); // this closes the line strip first |
|
225 |
mx = xPoints[nPoints-1] + transX; |
|
226 |
my = yPoints[nPoints-1] + transY; |
|
227 |
j2d_glVertex2i(mx, my); |
|
228 |
j2d_glVertex2i(mx+1, my+1); |
|
229 |
// no need for RESET_PREVIOUS_OP, as the line strip is no longer open |
|
230 |
} else { |
|
231 |
RESET_PREVIOUS_OP(); // so that we don't leave the line strip open |
|
232 |
} |
|
233 |
} |
|
234 |
||
235 |
JNIEXPORT void JNICALL |
|
236 |
Java_sun_java2d_opengl_OGLRenderer_drawPoly |
|
237 |
(JNIEnv *env, jobject oglr, |
|
238 |
jintArray xpointsArray, jintArray ypointsArray, |
|
239 |
jint nPoints, jboolean isClosed, |
|
240 |
jint transX, jint transY) |
|
241 |
{ |
|
242 |
jint *xPoints, *yPoints; |
|
243 |
||
244 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_drawPoly"); |
|
245 |
||
246 |
xPoints = (jint *) |
|
247 |
(*env)->GetPrimitiveArrayCritical(env, xpointsArray, NULL); |
|
248 |
if (xPoints != NULL) { |
|
249 |
yPoints = (jint *) |
|
250 |
(*env)->GetPrimitiveArrayCritical(env, ypointsArray, NULL); |
|
251 |
if (yPoints != NULL) { |
|
252 |
OGLContext *oglc = OGLRenderQueue_GetCurrentContext(); |
|
253 |
||
254 |
OGLRenderer_DrawPoly(oglc, |
|
255 |
nPoints, isClosed, |
|
256 |
transX, transY, |
|
257 |
xPoints, yPoints); |
|
258 |
||
259 |
// 6358147: reset current state, and ensure rendering is |
|
260 |
// flushed to dest |
|
261 |
if (oglc != NULL) { |
|
262 |
RESET_PREVIOUS_OP(); |
|
263 |
j2d_glFlush(); |
|
264 |
} |
|
265 |
||
266 |
(*env)->ReleasePrimitiveArrayCritical(env, ypointsArray, yPoints, |
|
267 |
JNI_ABORT); |
|
268 |
} |
|
269 |
(*env)->ReleasePrimitiveArrayCritical(env, xpointsArray, xPoints, |
|
270 |
JNI_ABORT); |
|
271 |
} |
|
272 |
} |
|
273 |
||
274 |
void |
|
275 |
OGLRenderer_DrawScanlines(OGLContext *oglc, |
|
276 |
jint scanlineCount, jint *scanlines) |
|
277 |
{ |
|
278 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DrawScanlines"); |
|
279 |
||
280 |
RETURN_IF_NULL(oglc); |
|
281 |
RETURN_IF_NULL(scanlines); |
|
282 |
||
283 |
CHECK_PREVIOUS_OP(GL_LINES); |
|
284 |
while (scanlineCount > 0) { |
|
285 |
// Translate each vertex by a fraction so |
|
286 |
// that we hit pixel centers. |
|
287 |
GLfloat x1 = ((GLfloat)*(scanlines++)) + 0.2f; |
|
288 |
GLfloat x2 = ((GLfloat)*(scanlines++)) + 1.2f; |
|
289 |
GLfloat y = ((GLfloat)*(scanlines++)) + 0.5f; |
|
290 |
j2d_glVertex2f(x1, y); |
|
291 |
j2d_glVertex2f(x2, y); |
|
292 |
scanlineCount--; |
|
293 |
} |
|
294 |
} |
|
295 |
||
296 |
void |
|
297 |
OGLRenderer_FillRect(OGLContext *oglc, jint x, jint y, jint w, jint h) |
|
298 |
{ |
|
299 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_FillRect"); |
|
300 |
||
301 |
if (w <= 0 || h <= 0) { |
|
302 |
return; |
|
303 |
} |
|
304 |
||
305 |
RETURN_IF_NULL(oglc); |
|
306 |
||
307 |
CHECK_PREVIOUS_OP(GL_QUADS); |
|
308 |
GLRECT_BODY_XYWH(x, y, w, h); |
|
309 |
} |
|
310 |
||
311 |
void |
|
312 |
OGLRenderer_FillSpans(OGLContext *oglc, jint spanCount, jint *spans) |
|
313 |
{ |
|
314 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_FillSpans"); |
|
315 |
||
316 |
RETURN_IF_NULL(oglc); |
|
317 |
RETURN_IF_NULL(spans); |
|
318 |
||
319 |
CHECK_PREVIOUS_OP(GL_QUADS); |
|
320 |
while (spanCount > 0) { |
|
321 |
jint x1 = *(spans++); |
|
322 |
jint y1 = *(spans++); |
|
323 |
jint x2 = *(spans++); |
|
324 |
jint y2 = *(spans++); |
|
325 |
GLRECT_BODY_XYXY(x1, y1, x2, y2); |
|
326 |
spanCount--; |
|
327 |
} |
|
328 |
} |
|
329 |
||
887 | 330 |
#define FILL_PGRAM(fx11, fy11, dx21, dy21, dx12, dy12) \ |
331 |
do { \ |
|
332 |
j2d_glVertex2f(fx11, fy11); \ |
|
333 |
j2d_glVertex2f(fx11 + dx21, fy11 + dy21); \ |
|
334 |
j2d_glVertex2f(fx11 + dx21 + dx12, fy11 + dy21 + dy12); \ |
|
335 |
j2d_glVertex2f(fx11 + dx12, fy11 + dy12); \ |
|
336 |
} while (0) |
|
337 |
||
338 |
void |
|
339 |
OGLRenderer_FillParallelogram(OGLContext *oglc, |
|
340 |
jfloat fx11, jfloat fy11, |
|
341 |
jfloat dx21, jfloat dy21, |
|
342 |
jfloat dx12, jfloat dy12) |
|
343 |
{ |
|
344 |
J2dTraceLn6(J2D_TRACE_INFO, |
|
345 |
"OGLRenderer_FillParallelogram " |
|
346 |
"(x=%6.2f y=%6.2f " |
|
347 |
"dx1=%6.2f dy1=%6.2f " |
|
348 |
"dx2=%6.2f dy2=%6.2f)", |
|
349 |
fx11, fy11, |
|
350 |
dx21, dy21, |
|
351 |
dx12, dy12); |
|
352 |
||
353 |
RETURN_IF_NULL(oglc); |
|
354 |
||
355 |
CHECK_PREVIOUS_OP(GL_QUADS); |
|
356 |
||
357 |
FILL_PGRAM(fx11, fy11, dx21, dy21, dx12, dy12); |
|
358 |
} |
|
359 |
||
360 |
void |
|
361 |
OGLRenderer_DrawParallelogram(OGLContext *oglc, |
|
362 |
jfloat fx11, jfloat fy11, |
|
363 |
jfloat dx21, jfloat dy21, |
|
364 |
jfloat dx12, jfloat dy12, |
|
365 |
jfloat lwr21, jfloat lwr12) |
|
366 |
{ |
|
367 |
// dx,dy for line width in the "21" and "12" directions. |
|
368 |
jfloat ldx21 = dx21 * lwr21; |
|
369 |
jfloat ldy21 = dy21 * lwr21; |
|
370 |
jfloat ldx12 = dx12 * lwr12; |
|
371 |
jfloat ldy12 = dy12 * lwr12; |
|
372 |
||
373 |
// calculate origin of the outer parallelogram |
|
374 |
jfloat ox11 = fx11 - (ldx21 + ldx12) / 2.0f; |
|
375 |
jfloat oy11 = fy11 - (ldy21 + ldy12) / 2.0f; |
|
376 |
||
377 |
J2dTraceLn8(J2D_TRACE_INFO, |
|
378 |
"OGLRenderer_DrawParallelogram " |
|
379 |
"(x=%6.2f y=%6.2f " |
|
380 |
"dx1=%6.2f dy1=%6.2f lwr1=%6.2f " |
|
381 |
"dx2=%6.2f dy2=%6.2f lwr2=%6.2f)", |
|
382 |
fx11, fy11, |
|
383 |
dx21, dy21, lwr21, |
|
384 |
dx12, dy12, lwr12); |
|
385 |
||
386 |
RETURN_IF_NULL(oglc); |
|
387 |
||
388 |
CHECK_PREVIOUS_OP(GL_QUADS); |
|
389 |
||
390 |
// Only need to generate 4 quads if the interior still |
|
391 |
// has a hole in it (i.e. if the line width ratio was |
|
392 |
// less than 1.0) |
|
393 |
if (lwr21 < 1.0f && lwr12 < 1.0f) { |
|
394 |
// Note: "TOP", "BOTTOM", "LEFT" and "RIGHT" here are |
|
395 |
// relative to whether the dxNN variables are positive |
|
396 |
// and negative. The math works fine regardless of |
|
397 |
// their signs, but for conceptual simplicity the |
|
398 |
// comments will refer to the sides as if the dxNN |
|
399 |
// were all positive. "TOP" and "BOTTOM" segments |
|
400 |
// are defined by the dxy21 deltas. "LEFT" and "RIGHT" |
|
401 |
// segments are defined by the dxy12 deltas. |
|
402 |
||
403 |
// Each segment includes its starting corner and comes |
|
404 |
// to just short of the following corner. Thus, each |
|
405 |
// corner is included just once and the only lengths |
|
406 |
// needed are the original parallelogram delta lengths |
|
407 |
// and the "line width deltas". The sides will cover |
|
408 |
// the following relative territories: |
|
409 |
// |
|
410 |
// T T T T T R |
|
411 |
// L R |
|
412 |
// L R |
|
413 |
// L R |
|
414 |
// L R |
|
415 |
// L B B B B B |
|
416 |
||
417 |
// TOP segment, to left side of RIGHT edge |
|
418 |
// "width" of original pgram, "height" of hor. line size |
|
419 |
fx11 = ox11; |
|
420 |
fy11 = oy11; |
|
421 |
FILL_PGRAM(fx11, fy11, dx21, dy21, ldx12, ldy12); |
|
422 |
||
423 |
// RIGHT segment, to top of BOTTOM edge |
|
424 |
// "width" of vert. line size , "height" of original pgram |
|
425 |
fx11 = ox11 + dx21; |
|
426 |
fy11 = oy11 + dy21; |
|
427 |
FILL_PGRAM(fx11, fy11, ldx21, ldy21, dx12, dy12); |
|
428 |
||
429 |
// BOTTOM segment, from right side of LEFT edge |
|
430 |
// "width" of original pgram, "height" of hor. line size |
|
431 |
fx11 = ox11 + dx12 + ldx21; |
|
432 |
fy11 = oy11 + dy12 + ldy21; |
|
433 |
FILL_PGRAM(fx11, fy11, dx21, dy21, ldx12, ldy12); |
|
434 |
||
435 |
// LEFT segment, from bottom of TOP edge |
|
436 |
// "width" of vert. line size , "height" of inner pgram |
|
437 |
fx11 = ox11 + ldx12; |
|
438 |
fy11 = oy11 + ldy12; |
|
439 |
FILL_PGRAM(fx11, fy11, ldx21, ldy21, dx12, dy12); |
|
440 |
} else { |
|
441 |
// The line width ratios were large enough to consume |
|
442 |
// the entire hole in the middle of the parallelogram |
|
443 |
// so we can just issue one large quad for the outer |
|
444 |
// parallelogram. |
|
445 |
dx21 += ldx21; |
|
446 |
dy21 += ldy21; |
|
447 |
dx12 += ldx12; |
|
448 |
dy12 += ldy12; |
|
449 |
FILL_PGRAM(ox11, oy11, dx21, dy21, dx12, dy12); |
|
450 |
} |
|
451 |
} |
|
452 |
||
453 |
static GLhandleARB aaPgramProgram = 0; |
|
454 |
||
455 |
/* |
|
456 |
* This shader fills the space between an outer and inner parallelogram. |
|
457 |
* It can be used to draw an outline by specifying both inner and outer |
|
458 |
* values. It fills pixels by estimating what portion falls inside the |
|
459 |
* outer shape, and subtracting an estimate of what portion falls inside |
|
460 |
* the inner shape. Specifying both inner and outer values produces a |
|
461 |
* standard "wide outline". Specifying an inner shape that falls far |
|
462 |
* outside the outer shape allows the same shader to fill the outer |
|
463 |
* shape entirely since pixels that fall within the outer shape are never |
|
464 |
* inside the inner shape and so they are filled based solely on their |
|
465 |
* coverage of the outer shape. |
|
466 |
* |
|
467 |
* The setup code renders this shader over the bounds of the outer |
|
468 |
* shape (or the only shape in the case of a fill operation) and |
|
469 |
* sets the texture 0 coordinates so that 0,0=>0,1=>1,1=>1,0 in those |
|
470 |
* texture coordinates map to the four corners of the parallelogram. |
|
471 |
* Similarly the texture 1 coordinates map the inner shape to the |
|
472 |
* unit square as well, but in a different coordinate system. |
|
473 |
* |
|
474 |
* When viewed in the texture coordinate systems the parallelograms |
|
475 |
* we are filling are unit squares, but the pixels have then become |
|
476 |
* tiny parallelograms themselves. Both of the texture coordinate |
|
477 |
* systems are affine transforms so the rate of change in X and Y |
|
478 |
* of the texture coordinates are essentially constants and happen |
|
479 |
* to correspond to the size and direction of the slanted sides of |
|
480 |
* the distorted pixels relative to the "square mapped" boundary |
|
481 |
* of the parallelograms. |
|
482 |
* |
|
483 |
* The shader uses the dFdx() and dFdy() functions to measure the "rate |
|
484 |
* of change" of these texture coordinates and thus gets an accurate |
|
485 |
* measure of the size and shape of a pixel relative to the two |
|
486 |
* parallelograms. It then uses the bounds of the size and shape |
|
487 |
* of a pixel to intersect with the unit square to estimate the |
|
488 |
* coverage of the pixel. Unfortunately, without a lot more work |
|
489 |
* to calculate the exact area of intersection between a unit |
|
490 |
* square (the original parallelogram) and a parallelogram (the |
|
491 |
* distorted pixel), this shader only approximates the pixel |
|
492 |
* coverage, but emperically the estimate is very useful and |
|
493 |
* produces visually pleasing results, if not theoretically accurate. |
|
494 |
*/ |
|
495 |
static const char *aaPgramShaderSource = |
|
496 |
"void main() {" |
|
497 |
// Calculate the vectors for the "legs" of the pixel parallelogram |
|
498 |
// for the outer parallelogram. |
|
499 |
" vec2 oleg1 = dFdx(gl_TexCoord[0].st);" |
|
500 |
" vec2 oleg2 = dFdy(gl_TexCoord[0].st);" |
|
501 |
// Calculate the bounds of the distorted pixel parallelogram. |
|
502 |
" vec2 corner = gl_TexCoord[0].st - (oleg1+oleg2)/2.0;" |
|
503 |
" vec2 omin = min(corner, corner+oleg1);" |
|
504 |
" omin = min(omin, corner+oleg2);" |
|
505 |
" omin = min(omin, corner+oleg1+oleg2);" |
|
506 |
" vec2 omax = max(corner, corner+oleg1);" |
|
507 |
" omax = max(omax, corner+oleg2);" |
|
508 |
" omax = max(omax, corner+oleg1+oleg2);" |
|
509 |
// Calculate the vectors for the "legs" of the pixel parallelogram |
|
510 |
// for the inner parallelogram. |
|
511 |
" vec2 ileg1 = dFdx(gl_TexCoord[1].st);" |
|
512 |
" vec2 ileg2 = dFdy(gl_TexCoord[1].st);" |
|
513 |
// Calculate the bounds of the distorted pixel parallelogram. |
|
514 |
" corner = gl_TexCoord[1].st - (ileg1+ileg2)/2.0;" |
|
515 |
" vec2 imin = min(corner, corner+ileg1);" |
|
516 |
" imin = min(imin, corner+ileg2);" |
|
517 |
" imin = min(imin, corner+ileg1+ileg2);" |
|
518 |
" vec2 imax = max(corner, corner+ileg1);" |
|
519 |
" imax = max(imax, corner+ileg2);" |
|
520 |
" imax = max(imax, corner+ileg1+ileg2);" |
|
521 |
// Clamp the bounds of the parallelograms to the unit square to |
|
522 |
// estimate the intersection of the pixel parallelogram with |
|
523 |
// the unit square. The ratio of the 2 rectangle areas is a |
|
524 |
// reasonable estimate of the proportion of coverage. |
|
525 |
" vec2 o1 = clamp(omin, 0.0, 1.0);" |
|
526 |
" vec2 o2 = clamp(omax, 0.0, 1.0);" |
|
527 |
" float oint = (o2.y-o1.y)*(o2.x-o1.x);" |
|
528 |
" float oarea = (omax.y-omin.y)*(omax.x-omin.x);" |
|
529 |
" vec2 i1 = clamp(imin, 0.0, 1.0);" |
|
530 |
" vec2 i2 = clamp(imax, 0.0, 1.0);" |
|
531 |
" float iint = (i2.y-i1.y)*(i2.x-i1.x);" |
|
532 |
" float iarea = (imax.y-imin.y)*(imax.x-imin.x);" |
|
533 |
// Proportion of pixel in outer shape minus the proportion |
|
534 |
// of pixel in the inner shape == the coverage of the pixel |
|
535 |
// in the area between the two. |
|
536 |
" float coverage = oint/oarea - iint / iarea;" |
|
537 |
" gl_FragColor = gl_Color * coverage;" |
|
538 |
"}"; |
|
539 |
||
540 |
#define ADJUST_PGRAM(V1, DV, V2) \ |
|
541 |
do { \ |
|
542 |
if ((DV) >= 0) { \ |
|
543 |
(V2) += (DV); \ |
|
544 |
} else { \ |
|
545 |
(V1) += (DV); \ |
|
546 |
} \ |
|
547 |
} while (0) |
|
548 |
||
549 |
// Invert the following transform: |
|
550 |
// DeltaT(0, 0) == (0, 0) |
|
551 |
// DeltaT(1, 0) == (DX1, DY1) |
|
552 |
// DeltaT(0, 1) == (DX2, DY2) |
|
553 |
// DeltaT(1, 1) == (DX1+DX2, DY1+DY2) |
|
554 |
// TM00 = DX1, TM01 = DX2, (TM02 = X11) |
|
555 |
// TM10 = DY1, TM11 = DY2, (TM12 = Y11) |
|
556 |
// Determinant = TM00*TM11 - TM01*TM10 |
|
557 |
// = DX1*DY2 - DX2*DY1 |
|
558 |
// Inverse is: |
|
559 |
// IM00 = TM11/det, IM01 = -TM01/det |
|
560 |
// IM10 = -TM10/det, IM11 = TM00/det |
|
561 |
// IM02 = (TM01 * TM12 - TM11 * TM02) / det, |
|
562 |
// IM12 = (TM10 * TM02 - TM00 * TM12) / det, |
|
563 |
||
564 |
#define DECLARE_MATRIX(MAT) \ |
|
565 |
jfloat MAT ## 00, MAT ## 01, MAT ## 02, MAT ## 10, MAT ## 11, MAT ## 12 |
|
566 |
||
567 |
#define GET_INVERTED_MATRIX(MAT, X11, Y11, DX1, DY1, DX2, DY2, RET_CODE) \ |
|
568 |
do { \ |
|
569 |
jfloat det = DX1*DY2 - DX2*DY1; \ |
|
570 |
if (det == 0) { \ |
|
571 |
RET_CODE; \ |
|
572 |
} \ |
|
573 |
MAT ## 00 = DY2/det; \ |
|
574 |
MAT ## 01 = -DX2/det; \ |
|
575 |
MAT ## 10 = -DY1/det; \ |
|
576 |
MAT ## 11 = DX1/det; \ |
|
577 |
MAT ## 02 = (DX2 * Y11 - DY2 * X11) / det; \ |
|
578 |
MAT ## 12 = (DY1 * X11 - DX1 * Y11) / det; \ |
|
579 |
} while (0) |
|
580 |
||
581 |
#define TRANSFORM(MAT, TX, TY, X, Y) \ |
|
582 |
do { \ |
|
583 |
TX = (X) * MAT ## 00 + (Y) * MAT ## 01 + MAT ## 02; \ |
|
584 |
TY = (X) * MAT ## 10 + (Y) * MAT ## 11 + MAT ## 12; \ |
|
585 |
} while (0) |
|
586 |
||
587 |
void |
|
588 |
OGLRenderer_FillAAParallelogram(OGLContext *oglc, OGLSDOps *dstOps, |
|
589 |
jfloat fx11, jfloat fy11, |
|
590 |
jfloat dx21, jfloat dy21, |
|
591 |
jfloat dx12, jfloat dy12) |
|
592 |
{ |
|
593 |
DECLARE_MATRIX(om); |
|
594 |
// parameters for parallelogram bounding box |
|
595 |
jfloat bx11, by11, bx22, by22; |
|
596 |
// parameters for uv texture coordinates of parallelogram corners |
|
597 |
jfloat u11, v11, u12, v12, u21, v21, u22, v22; |
|
598 |
||
599 |
J2dTraceLn6(J2D_TRACE_INFO, |
|
600 |
"OGLRenderer_FillAAParallelogram " |
|
601 |
"(x=%6.2f y=%6.2f " |
|
602 |
"dx1=%6.2f dy1=%6.2f " |
|
603 |
"dx2=%6.2f dy2=%6.2f)", |
|
604 |
fx11, fy11, |
|
605 |
dx21, dy21, |
|
606 |
dx12, dy12); |
|
607 |
||
608 |
RETURN_IF_NULL(oglc); |
|
609 |
RETURN_IF_NULL(dstOps); |
|
610 |
||
611 |
GET_INVERTED_MATRIX(om, fx11, fy11, dx21, dy21, dx12, dy12, |
|
612 |
return); |
|
613 |
||
614 |
CHECK_PREVIOUS_OP(OGL_STATE_PGRAM_OP); |
|
615 |
||
616 |
bx11 = bx22 = fx11; |
|
617 |
by11 = by22 = fy11; |
|
618 |
ADJUST_PGRAM(bx11, dx21, bx22); |
|
619 |
ADJUST_PGRAM(by11, dy21, by22); |
|
620 |
ADJUST_PGRAM(bx11, dx12, bx22); |
|
621 |
ADJUST_PGRAM(by11, dy12, by22); |
|
622 |
bx11 = (jfloat) floor(bx11); |
|
623 |
by11 = (jfloat) floor(by11); |
|
624 |
bx22 = (jfloat) ceil(bx22); |
|
625 |
by22 = (jfloat) ceil(by22); |
|
626 |
||
627 |
TRANSFORM(om, u11, v11, bx11, by11); |
|
628 |
TRANSFORM(om, u21, v21, bx22, by11); |
|
629 |
TRANSFORM(om, u12, v12, bx11, by22); |
|
630 |
TRANSFORM(om, u22, v22, bx22, by22); |
|
631 |
||
632 |
j2d_glBegin(GL_QUADS); |
|
633 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u11, v11); |
|
634 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 5.f, 5.f); |
|
635 |
j2d_glVertex2f(bx11, by11); |
|
636 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u21, v21); |
|
637 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 6.f, 5.f); |
|
638 |
j2d_glVertex2f(bx22, by11); |
|
639 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u22, v22); |
|
640 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 6.f, 6.f); |
|
641 |
j2d_glVertex2f(bx22, by22); |
|
642 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u12, v12); |
|
643 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 5.f, 6.f); |
|
644 |
j2d_glVertex2f(bx11, by22); |
|
645 |
j2d_glEnd(); |
|
646 |
} |
|
647 |
||
648 |
void |
|
649 |
OGLRenderer_FillAAParallelogramInnerOuter(OGLContext *oglc, OGLSDOps *dstOps, |
|
650 |
jfloat ox11, jfloat oy11, |
|
651 |
jfloat ox21, jfloat oy21, |
|
652 |
jfloat ox12, jfloat oy12, |
|
653 |
jfloat ix11, jfloat iy11, |
|
654 |
jfloat ix21, jfloat iy21, |
|
655 |
jfloat ix12, jfloat iy12) |
|
656 |
{ |
|
657 |
DECLARE_MATRIX(om); |
|
658 |
DECLARE_MATRIX(im); |
|
659 |
// parameters for parallelogram bounding box |
|
660 |
jfloat bx11, by11, bx22, by22; |
|
661 |
// parameters for uv texture coordinates of outer parallelogram corners |
|
662 |
jfloat ou11, ov11, ou12, ov12, ou21, ov21, ou22, ov22; |
|
663 |
// parameters for uv texture coordinates of inner parallelogram corners |
|
664 |
jfloat iu11, iv11, iu12, iv12, iu21, iv21, iu22, iv22; |
|
665 |
||
666 |
RETURN_IF_NULL(oglc); |
|
667 |
RETURN_IF_NULL(dstOps); |
|
668 |
||
669 |
GET_INVERTED_MATRIX(im, ix11, iy11, ix21, iy21, ix12, iy12, |
|
670 |
// inner parallelogram is degenerate |
|
671 |
// therefore it encloses no area |
|
672 |
// fill outer |
|
673 |
OGLRenderer_FillAAParallelogram(oglc, dstOps, |
|
674 |
ox11, oy11, |
|
675 |
ox21, oy21, |
|
676 |
ox12, oy12); |
|
677 |
return); |
|
678 |
GET_INVERTED_MATRIX(om, ox11, oy11, ox21, oy21, ox12, oy12, |
|
679 |
return); |
|
680 |
||
681 |
CHECK_PREVIOUS_OP(OGL_STATE_PGRAM_OP); |
|
682 |
||
683 |
bx11 = bx22 = ox11; |
|
684 |
by11 = by22 = oy11; |
|
685 |
ADJUST_PGRAM(bx11, ox21, bx22); |
|
686 |
ADJUST_PGRAM(by11, oy21, by22); |
|
687 |
ADJUST_PGRAM(bx11, ox12, bx22); |
|
688 |
ADJUST_PGRAM(by11, oy12, by22); |
|
689 |
bx11 = (jfloat) floor(bx11); |
|
690 |
by11 = (jfloat) floor(by11); |
|
691 |
bx22 = (jfloat) ceil(bx22); |
|
692 |
by22 = (jfloat) ceil(by22); |
|
693 |
||
694 |
TRANSFORM(om, ou11, ov11, bx11, by11); |
|
695 |
TRANSFORM(om, ou21, ov21, bx22, by11); |
|
696 |
TRANSFORM(om, ou12, ov12, bx11, by22); |
|
697 |
TRANSFORM(om, ou22, ov22, bx22, by22); |
|
698 |
||
699 |
TRANSFORM(im, iu11, iv11, bx11, by11); |
|
700 |
TRANSFORM(im, iu21, iv21, bx22, by11); |
|
701 |
TRANSFORM(im, iu12, iv12, bx11, by22); |
|
702 |
TRANSFORM(im, iu22, iv22, bx22, by22); |
|
703 |
||
704 |
j2d_glBegin(GL_QUADS); |
|
705 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou11, ov11); |
|
706 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu11, iv11); |
|
707 |
j2d_glVertex2f(bx11, by11); |
|
708 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou21, ov21); |
|
709 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu21, iv21); |
|
710 |
j2d_glVertex2f(bx22, by11); |
|
711 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou22, ov22); |
|
712 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu22, iv22); |
|
713 |
j2d_glVertex2f(bx22, by22); |
|
714 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE0_ARB, ou12, ov12); |
|
715 |
j2d_glMultiTexCoord2fARB(GL_TEXTURE1_ARB, iu12, iv12); |
|
716 |
j2d_glVertex2f(bx11, by22); |
|
717 |
j2d_glEnd(); |
|
718 |
} |
|
719 |
||
720 |
void |
|
721 |
OGLRenderer_DrawAAParallelogram(OGLContext *oglc, OGLSDOps *dstOps, |
|
722 |
jfloat fx11, jfloat fy11, |
|
723 |
jfloat dx21, jfloat dy21, |
|
724 |
jfloat dx12, jfloat dy12, |
|
725 |
jfloat lwr21, jfloat lwr12) |
|
726 |
{ |
|
727 |
// dx,dy for line width in the "21" and "12" directions. |
|
728 |
jfloat ldx21, ldy21, ldx12, ldy12; |
|
729 |
// parameters for "outer" parallelogram |
|
730 |
jfloat ofx11, ofy11, odx21, ody21, odx12, ody12; |
|
731 |
// parameters for "inner" parallelogram |
|
732 |
jfloat ifx11, ify11, idx21, idy21, idx12, idy12; |
|
733 |
||
734 |
J2dTraceLn8(J2D_TRACE_INFO, |
|
735 |
"OGLRenderer_DrawAAParallelogram " |
|
736 |
"(x=%6.2f y=%6.2f " |
|
737 |
"dx1=%6.2f dy1=%6.2f lwr1=%6.2f " |
|
738 |
"dx2=%6.2f dy2=%6.2f lwr2=%6.2f)", |
|
739 |
fx11, fy11, |
|
740 |
dx21, dy21, lwr21, |
|
741 |
dx12, dy12, lwr12); |
|
742 |
||
743 |
RETURN_IF_NULL(oglc); |
|
744 |
RETURN_IF_NULL(dstOps); |
|
745 |
||
746 |
// calculate true dx,dy for line widths from the "line width ratios" |
|
747 |
ldx21 = dx21 * lwr21; |
|
748 |
ldy21 = dy21 * lwr21; |
|
749 |
ldx12 = dx12 * lwr12; |
|
750 |
ldy12 = dy12 * lwr12; |
|
751 |
||
752 |
// calculate coordinates of the outer parallelogram |
|
753 |
ofx11 = fx11 - (ldx21 + ldx12) / 2.0f; |
|
754 |
ofy11 = fy11 - (ldy21 + ldy12) / 2.0f; |
|
755 |
odx21 = dx21 + ldx21; |
|
756 |
ody21 = dy21 + ldy21; |
|
757 |
odx12 = dx12 + ldx12; |
|
758 |
ody12 = dy12 + ldy12; |
|
759 |
||
760 |
// Only process the inner parallelogram if the line width ratio |
|
761 |
// did not consume the entire interior of the parallelogram |
|
762 |
// (i.e. if the width ratio was less than 1.0) |
|
763 |
if (lwr21 < 1.0f && lwr12 < 1.0f) { |
|
764 |
// calculate coordinates of the inner parallelogram |
|
765 |
ifx11 = fx11 + (ldx21 + ldx12) / 2.0f; |
|
766 |
ify11 = fy11 + (ldy21 + ldy12) / 2.0f; |
|
767 |
idx21 = dx21 - ldx21; |
|
768 |
idy21 = dy21 - ldy21; |
|
769 |
idx12 = dx12 - ldx12; |
|
770 |
idy12 = dy12 - ldy12; |
|
771 |
||
772 |
OGLRenderer_FillAAParallelogramInnerOuter(oglc, dstOps, |
|
773 |
ofx11, ofy11, |
|
774 |
odx21, ody21, |
|
775 |
odx12, ody12, |
|
776 |
ifx11, ify11, |
|
777 |
idx21, idy21, |
|
778 |
idx12, idy12); |
|
779 |
} else { |
|
780 |
OGLRenderer_FillAAParallelogram(oglc, dstOps, |
|
781 |
ofx11, ofy11, |
|
782 |
odx21, ody21, |
|
783 |
odx12, ody12); |
|
784 |
} |
|
785 |
} |
|
786 |
||
787 |
void |
|
788 |
OGLRenderer_EnableAAParallelogramProgram() |
|
789 |
{ |
|
790 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_EnableAAParallelogramProgram"); |
|
791 |
||
792 |
if (aaPgramProgram == 0) { |
|
793 |
aaPgramProgram = OGLContext_CreateFragmentProgram(aaPgramShaderSource); |
|
794 |
if (aaPgramProgram == 0) { |
|
795 |
J2dRlsTraceLn(J2D_TRACE_ERROR, |
|
796 |
"OGLRenderer_EnableAAParallelogramProgram: " |
|
797 |
"error creating program"); |
|
798 |
return; |
|
799 |
} |
|
800 |
} |
|
801 |
j2d_glUseProgramObjectARB(aaPgramProgram); |
|
802 |
} |
|
803 |
||
804 |
void |
|
805 |
OGLRenderer_DisableAAParallelogramProgram() |
|
806 |
{ |
|
807 |
J2dTraceLn(J2D_TRACE_INFO, "OGLRenderer_DisableAAParallelogramProgram"); |
|
808 |
||
809 |
j2d_glUseProgramObjectARB(0); |
|
810 |
} |
|
811 |
||
2 | 812 |
#endif /* !HEADLESS */ |