comparison: gldraw.cpp
gldraw.cpp
- changeset 134
- 7fd0784471df
- parent 133
- 5a8073d713a3
- child 135
- c243df39913e
equal
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inserted
replaced
| 133:5a8073d713a3 | 134:7fd0784471df |
|---|---|
| 556 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // | 556 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // |
| 557 // ========================================================================= // | 557 // ========================================================================= // |
| 558 void GLRenderer::pick (uint mx, uint my, bool add) { | 558 void GLRenderer::pick (uint mx, uint my, bool add) { |
| 559 GLint viewport[4]; | 559 GLint viewport[4]; |
| 560 | 560 |
| 561 // Clear the selection if we do not wish to add to it. | |
| 561 if (add == false) { | 562 if (add == false) { |
| 562 // Clear the selection if we don't wish to add to it. | |
| 563 std::vector<LDObject*> paOldSelection = g_ForgeWindow->paSelection; | 563 std::vector<LDObject*> paOldSelection = g_ForgeWindow->paSelection; |
| 564 g_ForgeWindow->paSelection.clear (); | 564 g_ForgeWindow->paSelection.clear (); |
| 565 | 565 |
| 566 // Recompile the prior selection to remove the highlight color | 566 // Recompile the prior selection to remove the highlight color |
| 567 for (LDObject* obj : paOldSelection) | 567 for (LDObject* obj : paOldSelection) |
| 579 | 579 |
| 580 short x0 = mx, | 580 short x0 = mx, |
| 581 y0 = my; | 581 y0 = my; |
| 582 short x1, y1; | 582 short x1, y1; |
| 583 | 583 |
| 584 // Determine how big an area to read - with range picking, we pick by | |
| 585 // the area given, with single pixel picking, we use an 1 x 1 area. | |
| 584 if (rangepick) { | 586 if (rangepick) { |
| 585 x1 = rangeStart.x (); | 587 x1 = rangeStart.x (); |
| 586 y1 = rangeStart.y (); | 588 y1 = rangeStart.y (); |
| 587 } else { | 589 } else { |
| 588 x1 = x0 + 1; | 590 x1 = x0 + 1; |
| 589 y1 = y0 + 1; | 591 y1 = y0 + 1; |
| 590 } | 592 } |
| 591 | 593 |
| 594 // x0 and y0 must be less than x1 and y1, respectively. | |
| 592 if (x0 > x1) | 595 if (x0 > x1) |
| 593 dataswap (x0, x1); | 596 dataswap (x0, x1); |
| 594 | 597 |
| 595 if (y0 > y1) | 598 if (y0 > y1) |
| 596 dataswap (y0, y1); | 599 dataswap (y0, y1); |
| 599 x0 = max<short> (0, x0); | 602 x0 = max<short> (0, x0); |
| 600 y0 = max<short> (0, y0); | 603 y0 = max<short> (0, y0); |
| 601 x1 = min<short> (x1, width); | 604 x1 = min<short> (x1, width); |
| 602 y1 = min<short> (y1, height); | 605 y1 = min<short> (y1, height); |
| 603 | 606 |
| 604 short areawidth = (x1 - x0); | 607 const short areawidth = (x1 - x0); |
| 605 short areaheight = (y1 - y0); | 608 const short areaheight = (y1 - y0); |
| 606 | |
| 607 const long numpixels = areawidth * areaheight; | 609 const long numpixels = areawidth * areaheight; |
| 610 | |
| 611 // Allocate space for the pixel data. | |
| 608 uchar* const pixeldata = new uchar[4 * numpixels]; | 612 uchar* const pixeldata = new uchar[4 * numpixels]; |
| 609 uchar* pixelptr = &pixeldata[0]; | 613 uchar* pixelptr = &pixeldata[0]; |
| 610 | 614 |
| 611 assert (viewport[3] == height); | 615 assert (viewport[3] == height); |
| 612 | 616 |
| 617 // Read pixels from the color buffer. | |
| 613 glReadPixels (x0, viewport[3] - y1, areawidth, areaheight, GL_RGBA, GL_UNSIGNED_BYTE, pixeldata); | 618 glReadPixels (x0, viewport[3] - y1, areawidth, areaheight, GL_RGBA, GL_UNSIGNED_BYTE, pixeldata); |
| 614 | 619 |
| 620 // Go through each pixel read and add them to the selection. | |
| 615 for (long i = 0; i < numpixels; ++i) { | 621 for (long i = 0; i < numpixels; ++i) { |
| 616 uint32 idx = | 622 uint32 idx = |
| 617 (*(pixelptr) * 0x10000) + | 623 (*(pixelptr) * 0x10000) + |
| 618 (*(pixelptr + 1) * 0x00100) + | 624 (*(pixelptr + 1) * 0x00100) + |
| 619 (*(pixelptr + 2) * 0x00001); | 625 (*(pixelptr + 2) * 0x00001); |
| 626 g_ForgeWindow->paSelection.push_back (obj); | 632 g_ForgeWindow->paSelection.push_back (obj); |
| 627 } | 633 } |
| 628 | 634 |
| 629 delete[] pixeldata; | 635 delete[] pixeldata; |
| 630 | 636 |
| 637 // Remove duplicate entries. For this to be effective, the vector must be | |
| 638 // sorted first. | |
| 631 std::vector<LDObject*>& sel = g_ForgeWindow->paSelection; | 639 std::vector<LDObject*>& sel = g_ForgeWindow->paSelection; |
| 632 std::sort (sel.begin(), sel.end ()); | 640 std::sort (sel.begin(), sel.end ()); |
| 633 std::vector<LDObject*>::iterator pos = std::unique (sel.begin (), sel.end ()); | 641 std::vector<LDObject*>::iterator pos = std::unique (sel.begin (), sel.end ()); |
| 634 sel.resize (std::distance (sel.begin (), pos)); | 642 sel.resize (std::distance (sel.begin (), pos)); |
| 635 | 643 |
| 644 // Update everything now. | |
| 636 g_ForgeWindow->buildObjList (); | 645 g_ForgeWindow->buildObjList (); |
| 637 | 646 |
| 638 picking = false; | 647 picking = false; |
| 639 rangepick = false; | 648 rangepick = false; |
| 640 glEnable (GL_DITHER); | 649 glEnable (GL_DITHER); |
