| 1 | // Created on: 2013-09-05 |
| 2 | // Created by: Anton POLETAEV |
| 3 | // Copyright (c) 2013-2014 OPEN CASCADE SAS |
| 4 | // |
| 5 | // This file is part of Open CASCADE Technology software library. |
| 6 | // |
| 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 |
| 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. |
| 12 | // |
| 13 | // Alternatively, this file may be used under the terms of Open CASCADE |
| 14 | // commercial license or contractual agreement. |
| 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 | #include <OpenGl_Structure.hxx> |
| 23 | |
| 24 | IMPLEMENT_STANDARD_HANDLE(OpenGl_CappingAlgoFilter, OpenGl_RenderFilter) |
| 25 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_CappingAlgoFilter, OpenGl_RenderFilter) |
| 26 | |
| 27 | Handle(OpenGl_RenderFilter) OpenGl_CappingAlgo::myRenderFilter; |
| 28 | OpenGl_AspectFace OpenGl_CappingAlgo::myFrontCulling; |
| 29 | OpenGl_AspectFace OpenGl_CappingAlgo::myNoneCulling; |
| 30 | Standard_Boolean OpenGl_CappingAlgo::myIsInit = Standard_False; |
| 31 | |
| 32 | namespace |
| 33 | { |
| 34 | static const OpenGl_Vec4 THE_CAPPING_PLN_VERTS[12] = |
| 35 | { OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 36 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f), |
| 37 | OpenGl_Vec4 ( 0.0f, 0.0f, 1.0f, 0.0f), |
| 38 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 39 | OpenGl_Vec4 ( 0.0f, 0.0f, 1.0f, 0.0f), |
| 40 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
| 41 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 42 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
| 43 | OpenGl_Vec4 ( 0.0f, 0.0f,-1.0f, 0.0f), |
| 44 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 45 | OpenGl_Vec4 ( 0.0f, 0.0f,-1.0f, 0.0f), |
| 46 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f) }; |
| 47 | |
| 48 | static const OpenGl_Vec4 THE_CAPPING_PLN_TCOORD[12] = |
| 49 | { OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 50 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f), |
| 51 | OpenGl_Vec4 ( 0.0f, 1.0f, 0.0f, 0.0f), |
| 52 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 53 | OpenGl_Vec4 ( 0.0f, 1.0f, 0.0f, 0.0f), |
| 54 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
| 55 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 56 | OpenGl_Vec4 (-1.0f, 0.0f, 0.0f, 0.0f), |
| 57 | OpenGl_Vec4 ( 0.0f,-1.0f, 0.0f, 0.0f), |
| 58 | OpenGl_Vec4 ( 0.0f, 0.0f, 0.0f, 1.0f), |
| 59 | OpenGl_Vec4 ( 0.0f,-1.0f, 0.0f, 0.0f), |
| 60 | OpenGl_Vec4 ( 1.0f, 0.0f, 0.0f, 0.0f) }; |
| 61 | }; |
| 62 | |
| 63 | // ======================================================================= |
| 64 | // function : RenderCapping |
| 65 | // purpose : |
| 66 | // ======================================================================= |
| 67 | void OpenGl_CappingAlgo::RenderCapping (const Handle(OpenGl_Workspace)& theWorkspace, |
| 68 | const Graphic3d_SequenceOfGroup& theGroups) |
| 69 | { |
| 70 | const Handle(OpenGl_Context)& aContext = theWorkspace->GetGlContext(); |
| 71 | |
| 72 | // check whether algorithm need to be performed |
| 73 | Standard_Boolean isCapping = Standard_False; |
| 74 | const Graphic3d_SequenceOfHClipPlane& aContextPlanes = aContext->Clipping().Planes(); |
| 75 | Graphic3d_SequenceOfHClipPlane::Iterator aCappingIt (aContextPlanes); |
| 76 | for (; aCappingIt.More(); aCappingIt.Next()) |
| 77 | { |
| 78 | const Handle(Graphic3d_ClipPlane)& aPlane = aCappingIt.Value(); |
| 79 | if (aPlane->IsCapping()) |
| 80 | { |
| 81 | isCapping = Standard_True; |
| 82 | break; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | // do not perform algorithm is there is nothing to render |
| 87 | if (!isCapping) |
| 88 | { |
| 89 | return; |
| 90 | } |
| 91 | |
| 92 | // init internal data |
| 93 | Init(); |
| 94 | |
| 95 | // remember current aspect face defined in workspace |
| 96 | const OpenGl_AspectFace* aFaceAsp = theWorkspace->AspectFace (Standard_False); |
| 97 | |
| 98 | // replace primitive groups rendering filter |
| 99 | static Handle(OpenGl_CappingAlgoFilter) aCappingFilter = new OpenGl_CappingAlgoFilter(); |
| 100 | Handle(OpenGl_RenderFilter) aRenderFilter = theWorkspace->GetRenderFilter(); |
| 101 | theWorkspace->SetRenderFilter (aCappingFilter); |
| 102 | |
| 103 | // prepare for rendering the clip planes |
| 104 | glEnable (GL_STENCIL_TEST); |
| 105 | |
| 106 | // generate capping for every clip plane |
| 107 | for (aCappingIt.Init (aContextPlanes); aCappingIt.More(); aCappingIt.Next()) |
| 108 | { |
| 109 | // get plane being rendered |
| 110 | const Handle(Graphic3d_ClipPlane)& aRenderPlane = aCappingIt.Value(); |
| 111 | if (!aRenderPlane->IsCapping()) |
| 112 | { |
| 113 | continue; |
| 114 | } |
| 115 | |
| 116 | // enable only the rendering plane to generate stencil mask |
| 117 | Graphic3d_SequenceOfHClipPlane::Iterator aPlaneIt (aContextPlanes); |
| 118 | for (; aPlaneIt.More(); aPlaneIt.Next()) |
| 119 | { |
| 120 | const Handle(Graphic3d_ClipPlane)& aPlane = aPlaneIt.Value(); |
| 121 | const Standard_Boolean isOn = (aPlane == aRenderPlane); |
| 122 | aContext->ChangeClipping().SetEnabled (aPlane, isOn); |
| 123 | } |
| 124 | |
| 125 | glClear (GL_STENCIL_BUFFER_BIT); |
| 126 | glColorMask (GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); |
| 127 | |
| 128 | // override aspects, disable culling |
| 129 | theWorkspace->SetAspectFace (NoneCulling()); |
| 130 | theWorkspace->AspectFace (Standard_True); |
| 131 | |
| 132 | // evaluate number of pair faces |
| 133 | glDisable (GL_DEPTH_TEST); |
| 134 | glDepthMask (GL_FALSE); |
| 135 | glStencilFunc (GL_ALWAYS, 1, 0x01); |
| 136 | glStencilOp (GL_KEEP, GL_INVERT, GL_INVERT); |
| 137 | |
| 138 | for (OpenGl_Structure::GroupIterator aGroupIt (theGroups); aGroupIt.More(); aGroupIt.Next()) |
| 139 | { |
| 140 | aGroupIt.Value()->Render (theWorkspace); |
| 141 | } |
| 142 | |
| 143 | // override material, cull back faces |
| 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 | |
| 227 | theWorkspace->SetStructureMatrix (aModelMatrix, true); |
| 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(); |
| 245 | myNoneCulling.ChangeCullingMode() = TelCullNone; |
| 246 | myNoneCulling.ChangeEdge() = 0; |
| 247 | |
| 248 | myFrontCulling.ChangeCullingMode() = TelCullBack; |
| 249 | myFrontCulling.ChangeEdge() = 0; |
| 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 | } |