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31 \**************************************************************************/
32
33 /*!
34 \class SoGLDrawStyleElement Inventor/elements/SoGLDrawStyleElement.h
35 \brief The SoGLDrawStyleElement updates the current draw style in OpenGL.
36
37 \ingroup elements
38 */
39
40 #include <Inventor/elements/SoGLDrawStyleElement.h>
41 #include "coindefs.h"
42
43 #ifdef HAVE_CONFIG_H
44 #include <config.h>
45 #endif // HAVE_CONFIG_H
46
47 #include <Inventor/system/gl.h>
48
49 #include <cassert>
50
51 SO_ELEMENT_SOURCE(SoGLDrawStyleElement);
52
53 // doc in superclass
54 void
initClass(void)55 SoGLDrawStyleElement::initClass(void)
56 {
57 SO_ELEMENT_INIT_CLASS(SoGLDrawStyleElement, inherited);
58 }
59
~SoGLDrawStyleElement(void)60 SoGLDrawStyleElement::~SoGLDrawStyleElement(void)
61 {
62 }
63
64 // doc in superclass
65 void
init(SoState * state)66 SoGLDrawStyleElement::init(SoState * state)
67 {
68 inherited::init(state);
69 }
70
71 // doc in superclass
72 void
push(SoState * state)73 SoGLDrawStyleElement::push(SoState * state)
74 {
75 SoGLDrawStyleElement * prev = (SoGLDrawStyleElement*)
76 this->getNextInStack();
77 // copy data to avoid unessesary GL calls
78 this->data = prev->data;
79 // capture previous element since we might or might not change the
80 // GL state in set/pop
81 prev->capture(state);
82 }
83
84 // doc in superclass
85 void
pop(SoState * COIN_UNUSED_ARG (state),const SoElement * prevTopElement)86 SoGLDrawStyleElement::pop(SoState * COIN_UNUSED_ARG(state),
87 const SoElement * prevTopElement)
88 {
89 SoGLDrawStyleElement * prev = (SoGLDrawStyleElement*) prevTopElement;
90 if (this->data != prev->data) this->updategl();
91 }
92
93 // doc in superclass
94 void
setElt(int32_t style)95 SoGLDrawStyleElement::setElt(int32_t style)
96 {
97 if (style != this->data) {
98 this->data = (int32_t)style;
99 this->updategl();
100 }
101 }
102
103 void
updategl(void)104 SoGLDrawStyleElement::updategl(void)
105 {
106 switch ((Style)this->data) {
107 case SoDrawStyleElement::FILLED:
108 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
109 break;
110 case SoDrawStyleElement::LINES:
111 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
112 break;
113 case SoDrawStyleElement::POINTS:
114 glPolygonMode(GL_FRONT_AND_BACK, GL_POINT);
115 break;
116 case SoDrawStyleElement::INVISIBLE:
117 // handled in SoShape::shouldGLRender()
118 break;
119 default:
120 assert(0 && "unsupported switch case");
121 break;
122 }
123 }
124