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Added tesselation of polygons for VBO based rendering (OpenGL GAL).

This commit is contained in:
Maciej Suminski 2013-05-27 09:37:49 +02:00
parent d45008a847
commit e8acd2919b
1 changed files with 42 additions and 14 deletions
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56
common/gal/opengl/opengl_gal.cpp
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@ -1404,10 +1404,19 @@ void OPENGL_GAL::DrawPolygon( const std::deque<VECTOR2D>& aPointList )
gluTessProperty( tesselator, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_POSITIVE );
glNormal3d( 0.0, 0.0, 1.0 );
glColor4d( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
color4( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
glShadeModel( GL_FLAT );
gluTessBeginPolygon( tesselator, NULL );
if( isGrouping )
{
// Store polygon triangles' coordinates to the current VBO item
gluTessBeginPolygon( tesselator, curVboItem );
}
else
{
// Display polygons directly
gluTessBeginPolygon( tesselator, NULL );
}
gluTessBeginContour( tesselator );
// use operator=( const POINTS& )
@ -1781,11 +1790,20 @@ void OPENGL_GAL::ComputeWorldScreenMatrix()
// Compare Redbook Chapter 11
void CALLBACK VertexCallback( GLvoid* aVertexPtr )
void CALLBACK VertexCallback( GLvoid* aVertexPtr, void* aData )
{
GLdouble* vertex = (GLdouble*) aVertexPtr;
GLdouble* vertex = static_cast<GLdouble*>( aVertexPtr );
glVertex3dv( vertex );
if( aData )
{
VBO_ITEM* vboItem = static_cast<VBO_ITEM*>( aData );
const GLfloat newVertex[] = { vertex[0], vertex[1], vertex[2] };
vboItem->PushVertex( newVertex );
}
else
{
glVertex3dv( vertex );
}
}
@ -1801,15 +1819,24 @@ void CALLBACK CombineCallback( GLdouble coords[3],
}
void CALLBACK BeginCallback( GLenum aWhich )
void CALLBACK EdgeCallback(void)
{
glBegin( aWhich );
// This callback is needed to force GLU tesselator to use triangles only
return;
}
void CALLBACK EndCallback()
void CALLBACK BeginCallback( GLenum aWhich, void* aData )
{
glEnd();
if( !aData )
glBegin( aWhich );
}
void CALLBACK EndCallback( void* aData )
{
if( !aData )
glEnd();
}
@ -1824,11 +1851,12 @@ void CALLBACK ErrorCallback( GLenum aErrorCode )
void InitTesselatorCallbacks( GLUtesselator* aTesselator )
{
gluTessCallback( aTesselator, GLU_TESS_VERTEX, ( void (CALLBACK*)() )VertexCallback );
gluTessCallback( aTesselator, GLU_TESS_COMBINE, ( void (CALLBACK*)() )CombineCallback );
gluTessCallback( aTesselator, GLU_TESS_BEGIN, ( void (CALLBACK*)() )BeginCallback );
gluTessCallback( aTesselator, GLU_TESS_END, ( void (CALLBACK*)() )EndCallback );
gluTessCallback( aTesselator, GLU_TESS_ERROR, ( void (CALLBACK*)() )ErrorCallback );
gluTessCallback( aTesselator, GLU_TESS_VERTEX_DATA, ( void (CALLBACK*)() )VertexCallback );
gluTessCallback( aTesselator, GLU_TESS_COMBINE, ( void (CALLBACK*)() )CombineCallback );
gluTessCallback( aTesselator, GLU_TESS_EDGE_FLAG, ( void (CALLBACK*)() )EdgeCallback );
gluTessCallback( aTesselator, GLU_TESS_BEGIN_DATA, ( void (CALLBACK*)() )BeginCallback );
gluTessCallback( aTesselator, GLU_TESS_END_DATA, ( void (CALLBACK*)() )EndCallback );
gluTessCallback( aTesselator, GLU_TESS_ERROR_DATA, ( void (CALLBACK*)() )ErrorCallback );
}