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1 | // Created on: 2013-09-05 |
2 | // Created by: Anton POLETAEV |
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3 | // Copyright (c) 2013-2014 OPEN CASCADE SAS |
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4 | // |
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5 | // This file is part of Open CASCADE Technology software library. |
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6 | // |
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7 | // This library is free software; you can redistribute it and/or modify it under |
8 | // the terms of the GNU Lesser General Public License version 2.1 as published |
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9 | // by the Free Software Foundation, with special exception defined in the file |
10 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
11 | // distribution for complete text of the license and disclaimer of any warranty. |
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12 | // |
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13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
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15 | |
16 | #include <OpenGl_CappingAlgo.hxx> |
17 | #include <OpenGl_Workspace.hxx> |
18 | #include <OpenGl_Context.hxx> |
19 | #include <OpenGl_PrimitiveArray.hxx> |
20 | #include <OpenGl_CappingPlaneResource.hxx> |
21 | #include <OpenGl_Vec.hxx> |
22 | |
23 | IMPLEMENT_STANDARD_HANDLE(OpenGl_CappingAlgoFilter, OpenGl_RenderFilter) |
24 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_CappingAlgoFilter, OpenGl_RenderFilter) |
25 | |
26 | Handle(OpenGl_RenderFilter) OpenGl_CappingAlgo::myRenderFilter; |
27 | OpenGl_AspectFace OpenGl_CappingAlgo::myFrontCulling; |
28 | OpenGl_AspectFace OpenGl_CappingAlgo::myNoneCulling; |
29 | Standard_Boolean OpenGl_CappingAlgo::myIsInit = Standard_False; |
30 | |
31 | namespace |
32 | { |
33 | static const OpenGl_Vec4 THE_CAPPING_PLN_VERTS[12] = |
34 | { OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
35 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f), |
36 | OpenGl_Vec4 ( 0.0f, 0.0f, 1.0f, 0.0f), |
37 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
38 | OpenGl_Vec4 ( 0.0f, 0.0f, 1.0f, 0.0f), |
39 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
40 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
41 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
42 | OpenGl_Vec4 ( 0.0f, 0.0f,-1.0f, 0.0f), |
43 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
44 | OpenGl_Vec4 ( 0.0f, 0.0f,-1.0f, 0.0f), |
45 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f) }; |
46 | |
47 | static const OpenGl_Vec4 THE_CAPPING_PLN_TCOORD[12] = |
48 | { OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
49 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f), |
50 | OpenGl_Vec4 ( 0.0f, 1.0f, 0.0f, 0.0f), |
51 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
52 | OpenGl_Vec4 ( 0.0f, 1.0f, 0.0f, 0.0f), |
53 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
54 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
55 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
56 | OpenGl_Vec4 ( 0.0f,-1.0f, 0.0f, 0.0f), |
57 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
58 | OpenGl_Vec4 ( 0.0f,-1.0f, 0.0f, 0.0f), |
59 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f) }; |
60 | }; |
61 | |
62 | // ======================================================================= |
63 | // function : RenderCapping |
64 | // purpose : |
65 | // ======================================================================= |
66 | void OpenGl_CappingAlgo::RenderCapping (const Handle(OpenGl_Workspace)& theWorkspace, |
67 | const OpenGl_ListOfGroup& theGroups) |
68 | { |
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69 | const Handle(OpenGl_Context)& aContext = theWorkspace->GetGlContext(); |
70 | |
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71 | // check whether algorithm need to be performed |
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72 | Standard_Boolean isCapping = Standard_False; |
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73 | const Graphic3d_SequenceOfHClipPlane& aContextPlanes = aContext->Clipping().Planes(); |
74 | Graphic3d_SequenceOfHClipPlane::Iterator aCappingIt (aContextPlanes); |
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75 | for (; aCappingIt.More(); aCappingIt.Next()) |
76 | { |
77 | const Handle(Graphic3d_ClipPlane)& aPlane = aCappingIt.Value(); |
78 | if (aPlane->IsCapping()) |
79 | { |
80 | isCapping = Standard_True; |
81 | break; |
82 | } |
83 | } |
84 | |
85 | // do not perform algorithm is there is nothing to render |
86 | if (!isCapping) |
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87 | { |
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88 | return; |
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89 | } |
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90 | |
91 | // init internal data |
92 | Init(); |
93 | |
94 | // remember current aspect face defined in workspace |
95 | const OpenGl_AspectFace* aFaceAsp = theWorkspace->AspectFace (Standard_False); |
96 | |
97 | // replace primitive groups rendering filter |
98 | static Handle(OpenGl_CappingAlgoFilter) aCappingFilter = new OpenGl_CappingAlgoFilter(); |
99 | Handle(OpenGl_RenderFilter) aRenderFilter = theWorkspace->GetRenderFilter(); |
100 | theWorkspace->SetRenderFilter (aCappingFilter); |
101 | |
102 | // prepare for rendering the clip planes |
103 | glEnable (GL_STENCIL_TEST); |
104 | |
105 | // generate capping for every clip plane |
106 | for (aCappingIt.Init (aContextPlanes); aCappingIt.More(); aCappingIt.Next()) |
107 | { |
108 | // get plane being rendered |
109 | const Handle(Graphic3d_ClipPlane)& aRenderPlane = aCappingIt.Value(); |
110 | if (!aRenderPlane->IsCapping()) |
111 | { |
112 | continue; |
113 | } |
114 | |
115 | // enable only the rendering plane to generate stencil mask |
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116 | Graphic3d_SequenceOfHClipPlane::Iterator aPlaneIt (aContextPlanes); |
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117 | for (; aPlaneIt.More(); aPlaneIt.Next()) |
118 | { |
119 | const Handle(Graphic3d_ClipPlane)& aPlane = aPlaneIt.Value(); |
120 | const Standard_Boolean isOn = (aPlane == aRenderPlane); |
121 | aContext->ChangeClipping().SetEnabled (aPlane, isOn); |
122 | } |
123 | |
124 | glClear (GL_STENCIL_BUFFER_BIT); |
125 | glColorMask (GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); |
126 | |
127 | // override aspects, disable culling |
128 | theWorkspace->SetAspectFace (NoneCulling()); |
129 | theWorkspace->AspectFace (Standard_True); |
130 | |
131 | // evaluate number of pair faces |
132 | glDisable (GL_DEPTH_TEST); |
133 | glDepthMask (GL_FALSE); |
134 | glStencilFunc (GL_ALWAYS, 1, 0x01); |
135 | glStencilOp (GL_KEEP, GL_INVERT, GL_INVERT); |
136 | |
137 | OpenGl_ListOfGroup::Iterator aGroupIt (theGroups); |
138 | for (; aGroupIt.More(); aGroupIt.Next()) |
139 | { |
140 | aGroupIt.Value()->Render (theWorkspace); |
141 | } |
142 | |
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143 | // override material, cull back faces |
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144 | theWorkspace->SetAspectFace (FrontCulling()); |
145 | theWorkspace->AspectFace (Standard_True); |
146 | |
147 | // enable all clip plane except the rendered one |
148 | for (aPlaneIt.Init (aContextPlanes); aPlaneIt.More(); aPlaneIt.Next()) |
149 | { |
150 | const Handle(Graphic3d_ClipPlane)& aPlane = aPlaneIt.Value(); |
151 | const Standard_Boolean isOn = (aPlane != aRenderPlane); |
152 | aContext->ChangeClipping().SetEnabled (aPlane, isOn); |
153 | } |
154 | |
155 | // render capping plane using the generated stencil mask |
156 | glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); |
157 | glDepthMask (GL_TRUE); |
158 | glDepthFunc (GL_LESS); |
159 | glStencilFunc (GL_EQUAL, 1, 0x01); |
160 | glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP); |
161 | glEnable (GL_DEPTH_TEST); |
162 | |
163 | RenderPlane (theWorkspace, aRenderPlane); |
164 | } |
165 | |
166 | // restore previous application state |
167 | glClear (GL_STENCIL_BUFFER_BIT); |
168 | glStencilFunc (GL_ALWAYS, 0, 0xFF); |
169 | glDisable (GL_STENCIL_TEST); |
170 | |
171 | // enable clipping |
172 | for (aCappingIt.Init (aContextPlanes); aCappingIt.More(); aCappingIt.Next()) |
173 | { |
174 | aContext->ChangeClipping().SetEnabled (aCappingIt.Value(), Standard_True); |
175 | } |
176 | |
177 | // restore rendering aspects |
178 | theWorkspace->SetAspectFace (aFaceAsp); |
179 | theWorkspace->SetRenderFilter (aRenderFilter); |
180 | } |
181 | |
182 | // ======================================================================= |
183 | // function : RenderPlane |
184 | // purpose : |
185 | // ======================================================================= |
186 | void OpenGl_CappingAlgo::RenderPlane (const Handle(OpenGl_Workspace)& theWorkspace, |
187 | const Handle(Graphic3d_ClipPlane)& thePlane) |
188 | { |
189 | const Handle(OpenGl_Context)& aContext = theWorkspace->GetGlContext(); |
190 | |
191 | // get resource for the plane |
192 | TCollection_AsciiString aResId = thePlane->GetId(); |
193 | |
194 | Handle(OpenGl_CappingPlaneResource) aPlaneRes; |
195 | if (!aContext->GetResource (aResId, aPlaneRes)) |
196 | { |
197 | // share and register for release once the resource is no longer used |
198 | aPlaneRes = new OpenGl_CappingPlaneResource (thePlane); |
199 | aContext->ShareResource (aResId, aPlaneRes); |
200 | } |
201 | |
202 | aPlaneRes->Update (aContext); |
203 | |
204 | const OpenGl_AspectFace* aFaceAspect = theWorkspace->AspectFace (Standard_False); |
205 | const OpenGl_AspectFace* aPlaneAspect = aPlaneRes->AspectFace(); |
206 | if (aPlaneAspect != NULL) |
207 | { |
208 | theWorkspace->SetAspectFace (aPlaneAspect); |
209 | } |
210 | |
211 | // apply aspect for rendering |
212 | theWorkspace->AspectFace (Standard_True); |
213 | |
214 | // set identity model matrix |
215 | const OpenGl_Matrix* aModelMatrix = theWorkspace->SetStructureMatrix (&OpenGl_IdentityMatrix); |
216 | |
217 | glMultMatrixf ((const GLfloat*)aPlaneRes->Orientation()); |
218 | glNormal3f (0.0f, 1.0f, 0.0f); |
219 | glEnableClientState (GL_VERTEX_ARRAY); |
220 | glVertexPointer (4, GL_FLOAT, 0, (GLfloat* )&THE_CAPPING_PLN_VERTS); |
221 | glEnableClientState (GL_TEXTURE_COORD_ARRAY); |
222 | glTexCoordPointer (4, GL_FLOAT, 0, (GLfloat*)&THE_CAPPING_PLN_TCOORD); |
223 | glDrawArrays (GL_TRIANGLES, 0, 12); |
224 | glDisableClientState (GL_VERTEX_ARRAY); |
225 | glDisableClientState (GL_TEXTURE_COORD_ARRAY); |
226 | |
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227 | theWorkspace->SetStructureMatrix (aModelMatrix, true); |
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228 | theWorkspace->SetAspectFace (aFaceAspect); |
229 | |
230 | // set delayed resource release |
231 | aPlaneRes.Nullify(); |
232 | aContext->ReleaseResource (aResId, Standard_True); |
233 | } |
234 | |
235 | // ======================================================================= |
236 | // function : Init |
237 | // purpose : |
238 | // ======================================================================= |
239 | void OpenGl_CappingAlgo::Init() |
240 | { |
241 | if (myIsInit) |
242 | return; |
243 | |
244 | myRenderFilter = new OpenGl_CappingAlgoFilter(); |
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245 | myNoneCulling.ChangeCullingMode() = TelCullNone; |
246 | myNoneCulling.ChangeEdge() = 0; |
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247 | |
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248 | myFrontCulling.ChangeCullingMode() = TelCullBack; |
249 | myFrontCulling.ChangeEdge() = 0; |
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250 | |
251 | myIsInit = Standard_True; |
252 | } |
253 | |
254 | // ======================================================================= |
255 | // function : CanRender |
256 | // purpose : |
257 | // ======================================================================= |
258 | Standard_Boolean OpenGl_CappingAlgoFilter::CanRender (const OpenGl_Element* theElement) |
259 | { |
260 | const OpenGl_PrimitiveArray* aPArray = |
261 | dynamic_cast<const OpenGl_PrimitiveArray*> (theElement); |
262 | if (!aPArray) |
263 | return Standard_False; |
264 | |
265 | switch (aPArray->PArray()->type) |
266 | { |
267 | case TelPolygonsArrayType : |
268 | case TelTrianglesArrayType : |
269 | case TelQuadranglesArrayType : |
270 | case TelTriangleStripsArrayType : |
271 | case TelQuadrangleStripsArrayType : |
272 | case TelTriangleFansArrayType : |
273 | return Standard_True; |
274 | |
275 | default: |
276 | return Standard_False; |
277 | } |
278 | } |