Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
5564 | serge | 1 | /* |
2 | * Mesa 3-D graphics library |
||
3 | * |
||
4 | * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. |
||
5 | * |
||
6 | * Permission is hereby granted, free of charge, to any person obtaining a |
||
7 | * copy of this software and associated documentation files (the "Software"), |
||
8 | * to deal in the Software without restriction, including without limitation |
||
9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
||
10 | * and/or sell copies of the Software, and to permit persons to whom the |
||
11 | * Software is furnished to do so, subject to the following conditions: |
||
12 | * |
||
13 | * The above copyright notice and this permission notice shall be included |
||
14 | * in all copies or substantial portions of the Software. |
||
15 | * |
||
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
||
17 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
||
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
||
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
||
20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
||
21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
||
22 | * OTHER DEALINGS IN THE SOFTWARE. |
||
23 | */ |
||
24 | |||
25 | #include "main/glheader.h" |
||
26 | #include "main/macros.h" |
||
27 | #include "main/imports.h" |
||
28 | #include "main/format_pack.h" |
||
29 | |||
30 | #include "s_context.h" |
||
31 | #include "s_span.h" |
||
32 | #include "s_stencil.h" |
||
33 | #include "s_zoom.h" |
||
34 | |||
35 | |||
36 | /** |
||
37 | * Compute the bounds of the region resulting from zooming a pixel span. |
||
38 | * The resulting region will be entirely inside the window/scissor bounds |
||
39 | * so no additional clipping is needed. |
||
40 | * \param imageX, imageY position of the mage being drawn (gl WindowPos) |
||
41 | * \param spanX, spanY position of span being drawing |
||
42 | * \param width number of pixels in span |
||
43 | * \param x0, x1 returned X bounds of zoomed region [x0, x1) |
||
44 | * \param y0, y1 returned Y bounds of zoomed region [y0, y1) |
||
45 | * \return GL_TRUE if any zoomed pixels visible, GL_FALSE if totally clipped |
||
46 | */ |
||
47 | static GLboolean |
||
48 | compute_zoomed_bounds(struct gl_context *ctx, GLint imageX, GLint imageY, |
||
49 | GLint spanX, GLint spanY, GLint width, |
||
50 | GLint *x0, GLint *x1, GLint *y0, GLint *y1) |
||
51 | { |
||
52 | const struct gl_framebuffer *fb = ctx->DrawBuffer; |
||
53 | GLint c0, c1, r0, r1; |
||
54 | |||
55 | assert(spanX >= imageX); |
||
56 | assert(spanY >= imageY); |
||
57 | |||
58 | /* |
||
59 | * Compute destination columns: [c0, c1) |
||
60 | */ |
||
61 | c0 = imageX + (GLint) ((spanX - imageX) * ctx->Pixel.ZoomX); |
||
62 | c1 = imageX + (GLint) ((spanX + width - imageX) * ctx->Pixel.ZoomX); |
||
63 | if (c1 < c0) { |
||
64 | /* swap */ |
||
65 | GLint tmp = c1; |
||
66 | c1 = c0; |
||
67 | c0 = tmp; |
||
68 | } |
||
69 | c0 = CLAMP(c0, fb->_Xmin, fb->_Xmax); |
||
70 | c1 = CLAMP(c1, fb->_Xmin, fb->_Xmax); |
||
71 | if (c0 == c1) { |
||
72 | return GL_FALSE; /* no width */ |
||
73 | } |
||
74 | |||
75 | /* |
||
76 | * Compute destination rows: [r0, r1) |
||
77 | */ |
||
78 | r0 = imageY + (GLint) ((spanY - imageY) * ctx->Pixel.ZoomY); |
||
79 | r1 = imageY + (GLint) ((spanY + 1 - imageY) * ctx->Pixel.ZoomY); |
||
80 | if (r1 < r0) { |
||
81 | /* swap */ |
||
82 | GLint tmp = r1; |
||
83 | r1 = r0; |
||
84 | r0 = tmp; |
||
85 | } |
||
86 | r0 = CLAMP(r0, fb->_Ymin, fb->_Ymax); |
||
87 | r1 = CLAMP(r1, fb->_Ymin, fb->_Ymax); |
||
88 | if (r0 == r1) { |
||
89 | return GL_FALSE; /* no height */ |
||
90 | } |
||
91 | |||
92 | *x0 = c0; |
||
93 | *x1 = c1; |
||
94 | *y0 = r0; |
||
95 | *y1 = r1; |
||
96 | |||
97 | return GL_TRUE; |
||
98 | } |
||
99 | |||
100 | |||
101 | /** |
||
102 | * Convert a zoomed x image coordinate back to an unzoomed x coord. |
||
103 | * 'zx' is screen position of a pixel in the zoomed image, who's left edge |
||
104 | * is at 'imageX'. |
||
105 | * return corresponding x coord in the original, unzoomed image. |
||
106 | * This can use this for unzooming X or Y values. |
||
107 | */ |
||
108 | static inline GLint |
||
109 | unzoom_x(GLfloat zoomX, GLint imageX, GLint zx) |
||
110 | { |
||
111 | /* |
||
112 | zx = imageX + (x - imageX) * zoomX; |
||
113 | zx - imageX = (x - imageX) * zoomX; |
||
114 | (zx - imageX) / zoomX = x - imageX; |
||
115 | */ |
||
116 | GLint x; |
||
117 | if (zoomX < 0.0) |
||
118 | zx++; |
||
119 | x = imageX + (GLint) ((zx - imageX) / zoomX); |
||
120 | return x; |
||
121 | } |
||
122 | |||
123 | |||
124 | |||
125 | /** |
||
126 | * Helper function called from _swrast_write_zoomed_rgba/rgb/ |
||
127 | * index/depth_span(). |
||
128 | */ |
||
129 | static void |
||
130 | zoom_span( struct gl_context *ctx, GLint imgX, GLint imgY, const SWspan *span, |
||
131 | const GLvoid *src, GLenum format ) |
||
132 | { |
||
133 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
||
134 | SWspan zoomed; |
||
135 | GLint x0, x1, y0, y1; |
||
136 | GLint zoomedWidth; |
||
137 | |||
138 | if (!compute_zoomed_bounds(ctx, imgX, imgY, span->x, span->y, span->end, |
||
139 | &x0, &x1, &y0, &y1)) { |
||
140 | return; /* totally clipped */ |
||
141 | } |
||
142 | |||
143 | if (!swrast->ZoomedArrays) { |
||
144 | /* allocate on demand */ |
||
145 | swrast->ZoomedArrays = (SWspanarrays *) calloc(1, sizeof(SWspanarrays)); |
||
146 | if (!swrast->ZoomedArrays) |
||
147 | return; |
||
148 | } |
||
149 | |||
150 | zoomedWidth = x1 - x0; |
||
151 | assert(zoomedWidth > 0); |
||
152 | assert(zoomedWidth <= SWRAST_MAX_WIDTH); |
||
153 | |||
154 | /* no pixel arrays! must be horizontal spans. */ |
||
155 | assert((span->arrayMask & SPAN_XY) == 0); |
||
156 | assert(span->primitive == GL_BITMAP); |
||
157 | |||
158 | INIT_SPAN(zoomed, GL_BITMAP); |
||
159 | zoomed.x = x0; |
||
160 | zoomed.end = zoomedWidth; |
||
161 | zoomed.array = swrast->ZoomedArrays; |
||
162 | zoomed.array->ChanType = span->array->ChanType; |
||
163 | if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) |
||
164 | zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba8; |
||
165 | else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) |
||
166 | zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->rgba16; |
||
167 | else |
||
168 | zoomed.array->rgba = (GLchan (*)[4]) zoomed.array->attribs[VARYING_SLOT_COL0]; |
||
169 | |||
170 | COPY_4V(zoomed.attrStart[VARYING_SLOT_POS], span->attrStart[VARYING_SLOT_POS]); |
||
171 | COPY_4V(zoomed.attrStepX[VARYING_SLOT_POS], span->attrStepX[VARYING_SLOT_POS]); |
||
172 | COPY_4V(zoomed.attrStepY[VARYING_SLOT_POS], span->attrStepY[VARYING_SLOT_POS]); |
||
173 | |||
174 | zoomed.attrStart[VARYING_SLOT_FOGC][0] = span->attrStart[VARYING_SLOT_FOGC][0]; |
||
175 | zoomed.attrStepX[VARYING_SLOT_FOGC][0] = span->attrStepX[VARYING_SLOT_FOGC][0]; |
||
176 | zoomed.attrStepY[VARYING_SLOT_FOGC][0] = span->attrStepY[VARYING_SLOT_FOGC][0]; |
||
177 | |||
178 | if (format == GL_RGBA || format == GL_RGB) { |
||
179 | /* copy Z info */ |
||
180 | zoomed.z = span->z; |
||
181 | zoomed.zStep = span->zStep; |
||
182 | /* we'll generate an array of colorss */ |
||
183 | zoomed.interpMask = span->interpMask & ~SPAN_RGBA; |
||
184 | zoomed.arrayMask |= SPAN_RGBA; |
||
185 | zoomed.arrayAttribs |= VARYING_BIT_COL0; /* we'll produce these values */ |
||
186 | assert(span->arrayMask & SPAN_RGBA); |
||
187 | } |
||
188 | else if (format == GL_DEPTH_COMPONENT) { |
||
189 | /* Copy color info */ |
||
190 | zoomed.red = span->red; |
||
191 | zoomed.green = span->green; |
||
192 | zoomed.blue = span->blue; |
||
193 | zoomed.alpha = span->alpha; |
||
194 | zoomed.redStep = span->redStep; |
||
195 | zoomed.greenStep = span->greenStep; |
||
196 | zoomed.blueStep = span->blueStep; |
||
197 | zoomed.alphaStep = span->alphaStep; |
||
198 | /* we'll generate an array of depth values */ |
||
199 | zoomed.interpMask = span->interpMask & ~SPAN_Z; |
||
200 | zoomed.arrayMask |= SPAN_Z; |
||
201 | assert(span->arrayMask & SPAN_Z); |
||
202 | } |
||
203 | else { |
||
204 | _mesa_problem(ctx, "Bad format in zoom_span"); |
||
205 | return; |
||
206 | } |
||
207 | |||
208 | /* zoom the span horizontally */ |
||
209 | if (format == GL_RGBA) { |
||
210 | if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) { |
||
211 | const GLubyte (*rgba)[4] = (const GLubyte (*)[4]) src; |
||
212 | GLint i; |
||
213 | for (i = 0; i < zoomedWidth; i++) { |
||
214 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
215 | assert(j >= 0); |
||
216 | assert(j < (GLint) span->end); |
||
217 | COPY_4UBV(zoomed.array->rgba8[i], rgba[j]); |
||
218 | } |
||
219 | } |
||
220 | else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) { |
||
221 | const GLushort (*rgba)[4] = (const GLushort (*)[4]) src; |
||
222 | GLint i; |
||
223 | for (i = 0; i < zoomedWidth; i++) { |
||
224 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
225 | assert(j >= 0); |
||
226 | assert(j < (GLint) span->end); |
||
227 | COPY_4V(zoomed.array->rgba16[i], rgba[j]); |
||
228 | } |
||
229 | } |
||
230 | else { |
||
231 | const GLfloat (*rgba)[4] = (const GLfloat (*)[4]) src; |
||
232 | GLint i; |
||
233 | for (i = 0; i < zoomedWidth; i++) { |
||
234 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
235 | assert(j >= 0); |
||
236 | assert(j < (GLint) span->end); |
||
237 | COPY_4V(zoomed.array->attribs[VARYING_SLOT_COL0][i], rgba[j]); |
||
238 | } |
||
239 | } |
||
240 | } |
||
241 | else if (format == GL_RGB) { |
||
242 | if (zoomed.array->ChanType == GL_UNSIGNED_BYTE) { |
||
243 | const GLubyte (*rgb)[3] = (const GLubyte (*)[3]) src; |
||
244 | GLint i; |
||
245 | for (i = 0; i < zoomedWidth; i++) { |
||
246 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
247 | assert(j >= 0); |
||
248 | assert(j < (GLint) span->end); |
||
249 | zoomed.array->rgba8[i][0] = rgb[j][0]; |
||
250 | zoomed.array->rgba8[i][1] = rgb[j][1]; |
||
251 | zoomed.array->rgba8[i][2] = rgb[j][2]; |
||
252 | zoomed.array->rgba8[i][3] = 0xff; |
||
253 | } |
||
254 | } |
||
255 | else if (zoomed.array->ChanType == GL_UNSIGNED_SHORT) { |
||
256 | const GLushort (*rgb)[3] = (const GLushort (*)[3]) src; |
||
257 | GLint i; |
||
258 | for (i = 0; i < zoomedWidth; i++) { |
||
259 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
260 | assert(j >= 0); |
||
261 | assert(j < (GLint) span->end); |
||
262 | zoomed.array->rgba16[i][0] = rgb[j][0]; |
||
263 | zoomed.array->rgba16[i][1] = rgb[j][1]; |
||
264 | zoomed.array->rgba16[i][2] = rgb[j][2]; |
||
265 | zoomed.array->rgba16[i][3] = 0xffff; |
||
266 | } |
||
267 | } |
||
268 | else { |
||
269 | const GLfloat (*rgb)[3] = (const GLfloat (*)[3]) src; |
||
270 | GLint i; |
||
271 | for (i = 0; i < zoomedWidth; i++) { |
||
272 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
273 | assert(j >= 0); |
||
274 | assert(j < (GLint) span->end); |
||
275 | zoomed.array->attribs[VARYING_SLOT_COL0][i][0] = rgb[j][0]; |
||
276 | zoomed.array->attribs[VARYING_SLOT_COL0][i][1] = rgb[j][1]; |
||
277 | zoomed.array->attribs[VARYING_SLOT_COL0][i][2] = rgb[j][2]; |
||
278 | zoomed.array->attribs[VARYING_SLOT_COL0][i][3] = 1.0F; |
||
279 | } |
||
280 | } |
||
281 | } |
||
282 | else if (format == GL_DEPTH_COMPONENT) { |
||
283 | const GLuint *zValues = (const GLuint *) src; |
||
284 | GLint i; |
||
285 | for (i = 0; i < zoomedWidth; i++) { |
||
286 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - span->x; |
||
287 | assert(j >= 0); |
||
288 | assert(j < (GLint) span->end); |
||
289 | zoomed.array->z[i] = zValues[j]; |
||
290 | } |
||
291 | /* Now, fall into the RGB path below */ |
||
292 | format = GL_RGBA; |
||
293 | } |
||
294 | |||
295 | /* write the span in rows [r0, r1) */ |
||
296 | if (format == GL_RGBA || format == GL_RGB) { |
||
297 | /* Writing the span may modify the colors, so make a backup now if we're |
||
298 | * going to call _swrast_write_zoomed_span() more than once. |
||
299 | * Also, clipping may change the span end value, so store it as well. |
||
300 | */ |
||
301 | const GLint end = zoomed.end; /* save */ |
||
302 | void *rgbaSave; |
||
303 | const GLint pixelSize = |
||
304 | (zoomed.array->ChanType == GL_UNSIGNED_BYTE) ? 4 * sizeof(GLubyte) : |
||
305 | ((zoomed.array->ChanType == GL_UNSIGNED_SHORT) ? 4 * sizeof(GLushort) |
||
306 | : 4 * sizeof(GLfloat)); |
||
307 | |||
308 | rgbaSave = malloc(zoomed.end * pixelSize); |
||
309 | if (!rgbaSave) { |
||
310 | return; |
||
311 | } |
||
312 | |||
313 | if (y1 - y0 > 1) { |
||
314 | memcpy(rgbaSave, zoomed.array->rgba, zoomed.end * pixelSize); |
||
315 | } |
||
316 | for (zoomed.y = y0; zoomed.y < y1; zoomed.y++) { |
||
317 | _swrast_write_rgba_span(ctx, &zoomed); |
||
318 | zoomed.end = end; /* restore */ |
||
319 | if (y1 - y0 > 1) { |
||
320 | /* restore the colors */ |
||
321 | memcpy(zoomed.array->rgba, rgbaSave, zoomed.end * pixelSize); |
||
322 | } |
||
323 | } |
||
324 | |||
325 | free(rgbaSave); |
||
326 | } |
||
327 | } |
||
328 | |||
329 | |||
330 | void |
||
331 | _swrast_write_zoomed_rgba_span(struct gl_context *ctx, GLint imgX, GLint imgY, |
||
332 | const SWspan *span, const GLvoid *rgba) |
||
333 | { |
||
334 | zoom_span(ctx, imgX, imgY, span, rgba, GL_RGBA); |
||
335 | } |
||
336 | |||
337 | |||
338 | void |
||
339 | _swrast_write_zoomed_rgb_span(struct gl_context *ctx, GLint imgX, GLint imgY, |
||
340 | const SWspan *span, const GLvoid *rgb) |
||
341 | { |
||
342 | zoom_span(ctx, imgX, imgY, span, rgb, GL_RGB); |
||
343 | } |
||
344 | |||
345 | |||
346 | void |
||
347 | _swrast_write_zoomed_depth_span(struct gl_context *ctx, GLint imgX, GLint imgY, |
||
348 | const SWspan *span) |
||
349 | { |
||
350 | zoom_span(ctx, imgX, imgY, span, |
||
351 | (const GLvoid *) span->array->z, GL_DEPTH_COMPONENT); |
||
352 | } |
||
353 | |||
354 | |||
355 | /** |
||
356 | * Zoom/write stencil values. |
||
357 | * No per-fragment operations are applied. |
||
358 | */ |
||
359 | void |
||
360 | _swrast_write_zoomed_stencil_span(struct gl_context *ctx, GLint imgX, GLint imgY, |
||
361 | GLint width, GLint spanX, GLint spanY, |
||
362 | const GLubyte stencil[]) |
||
363 | { |
||
364 | GLubyte *zoomedVals; |
||
365 | GLint x0, x1, y0, y1, y; |
||
366 | GLint i, zoomedWidth; |
||
367 | |||
368 | if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width, |
||
369 | &x0, &x1, &y0, &y1)) { |
||
370 | return; /* totally clipped */ |
||
371 | } |
||
372 | |||
373 | zoomedWidth = x1 - x0; |
||
374 | assert(zoomedWidth > 0); |
||
375 | assert(zoomedWidth <= SWRAST_MAX_WIDTH); |
||
376 | |||
377 | zoomedVals = malloc(zoomedWidth * sizeof(GLubyte)); |
||
378 | if (!zoomedVals) |
||
379 | return; |
||
380 | |||
381 | /* zoom the span horizontally */ |
||
382 | for (i = 0; i < zoomedWidth; i++) { |
||
383 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX; |
||
384 | assert(j >= 0); |
||
385 | assert(j < width); |
||
386 | zoomedVals[i] = stencil[j]; |
||
387 | } |
||
388 | |||
389 | /* write the zoomed spans */ |
||
390 | for (y = y0; y < y1; y++) { |
||
391 | _swrast_write_stencil_span(ctx, zoomedWidth, x0, y, zoomedVals); |
||
392 | } |
||
393 | |||
394 | free(zoomedVals); |
||
395 | } |
||
396 | |||
397 | |||
398 | /** |
||
399 | * Zoom/write 32-bit Z values. |
||
400 | * No per-fragment operations are applied. |
||
401 | */ |
||
402 | void |
||
403 | _swrast_write_zoomed_z_span(struct gl_context *ctx, GLint imgX, GLint imgY, |
||
404 | GLint width, GLint spanX, GLint spanY, |
||
405 | const GLuint *zVals) |
||
406 | { |
||
407 | struct gl_renderbuffer *rb = |
||
408 | ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer; |
||
409 | GLuint *zoomedVals; |
||
410 | GLint x0, x1, y0, y1, y; |
||
411 | GLint i, zoomedWidth; |
||
412 | |||
413 | if (!compute_zoomed_bounds(ctx, imgX, imgY, spanX, spanY, width, |
||
414 | &x0, &x1, &y0, &y1)) { |
||
415 | return; /* totally clipped */ |
||
416 | } |
||
417 | |||
418 | zoomedWidth = x1 - x0; |
||
419 | assert(zoomedWidth > 0); |
||
420 | assert(zoomedWidth <= SWRAST_MAX_WIDTH); |
||
421 | |||
422 | zoomedVals = malloc(zoomedWidth * sizeof(GLuint)); |
||
423 | if (!zoomedVals) |
||
424 | return; |
||
425 | |||
426 | /* zoom the span horizontally */ |
||
427 | for (i = 0; i < zoomedWidth; i++) { |
||
428 | GLint j = unzoom_x(ctx->Pixel.ZoomX, imgX, x0 + i) - spanX; |
||
429 | assert(j >= 0); |
||
430 | assert(j < width); |
||
431 | zoomedVals[i] = zVals[j]; |
||
432 | } |
||
433 | |||
434 | /* write the zoomed spans */ |
||
435 | for (y = y0; y < y1; y++) { |
||
436 | GLubyte *dst = _swrast_pixel_address(rb, x0, y); |
||
437 | _mesa_pack_uint_z_row(rb->Format, zoomedWidth, zoomedVals, dst); |
||
438 | } |
||
439 | |||
440 | free(zoomedVals); |
||
441 | }>>>=>>>>=>>>>>>>>>>>>>>>>=>>>> |