495 lines
18 KiB
C++
495 lines
18 KiB
C++
/*
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* This program source code file is part of KICAD, a free EDA CAD application.
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*
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* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
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* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
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* Copyright (C) 2013-2017 CERN
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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*
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* Graphics Abstraction Layer (GAL) for OpenGL
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef OPENGLGAL_H_
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#define OPENGLGAL_H_
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// GAL imports
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#include <gal/graphics_abstraction_layer.h>
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#include <gal/gal_display_options.h>
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#include <gal/opengl/shader.h>
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#include <gal/opengl/vertex_manager.h>
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#include <gal/opengl/vertex_item.h>
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#include <gal/opengl/cached_container.h>
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#include <gal/opengl/noncached_container.h>
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#include <gal/opengl/opengl_compositor.h>
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#include <gal/hidpi_gl_canvas.h>
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#include <unordered_map>
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#include <boost/smart_ptr/shared_array.hpp>
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#include <memory>
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#ifndef CALLBACK
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#define CALLBACK
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#endif
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struct bitmap_glyph;
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namespace KIGFX
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{
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class SHADER;
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class GL_BITMAP_CACHE;
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/**
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* @brief Class OpenGL_GAL is the OpenGL implementation of the Graphics Abstraction Layer.
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*
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* This is a direct OpenGL-implementation and uses low-level graphics primitives like triangles
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* and quads. The purpose is to provide a fast graphics interface, that takes advantage of modern
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* graphics card GPUs. All methods here benefit thus from the hardware acceleration.
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*/
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class OPENGL_GAL : public GAL, public HIDPI_GL_CANVAS
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{
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public:
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/**
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* @brief Constructor OPENGL_GAL
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*
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* @param aParent is the wxWidgets immediate wxWindow parent of this object.
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*
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* @param aMouseListener is the wxEvtHandler that should receive the mouse events,
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* this can be can be any wxWindow, but is often a wxFrame container.
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*
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* @param aPaintListener is the wxEvtHandler that should receive the paint
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* event. This can be any wxWindow, but is often a derived instance
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* of this class or a containing wxFrame. The "paint event" here is
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* a wxCommandEvent holding EVT_GAL_REDRAW, as sent by PostPaint().
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*
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* @param aName is the name of this window for use by wxWindow::FindWindowByName()
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*/
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OPENGL_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions, wxWindow* aParent,
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wxEvtHandler* aMouseListener = nullptr, wxEvtHandler* aPaintListener = nullptr,
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const wxString& aName = wxT( "GLCanvas" ) );
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virtual ~OPENGL_GAL();
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virtual bool IsOpenGlEngine() override { return true; }
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/// @copydoc GAL::IsInitialized()
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virtual bool IsInitialized() const override
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{
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// is*Initialized flags, but it is enough for OpenGL to show up
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return IsShownOnScreen() && !GetClientRect().IsEmpty();
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}
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///> @copydoc GAL::IsVisible()
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bool IsVisible() const override
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{
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return IsShownOnScreen() && !GetClientRect().IsEmpty();
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}
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// ---------------
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// Drawing methods
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// ---------------
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/// @copydoc GAL::DrawLine()
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virtual void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
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/// @copydoc GAL::DrawSegment()
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virtual void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
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double aWidth ) override;
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/// @copydoc GAL::DrawCircle()
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virtual void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius ) override;
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/// @copydoc GAL::DrawArc()
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virtual void DrawArc( const VECTOR2D& aCenterPoint, double aRadius,
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double aStartAngle, double aEndAngle ) override;
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/// @copydoc GAL::DrawArcSegment()
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virtual void DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius,
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double aStartAngle, double aEndAngle, double aWidth ) override;
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/// @copydoc GAL::DrawRectangle()
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virtual void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
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/// @copydoc GAL::DrawPolyline()
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virtual void DrawPolyline( const std::deque<VECTOR2D>& aPointList ) override;
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virtual void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) override;
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virtual void DrawPolyline( const SHAPE_LINE_CHAIN& aLineChain ) override;
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/// @copydoc GAL::DrawPolygon()
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virtual void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) override;
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virtual void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) override;
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virtual void DrawPolygon( const SHAPE_POLY_SET& aPolySet ) override;
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virtual void DrawPolygon( const SHAPE_LINE_CHAIN& aPolySet ) override;
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/// @copydoc GAL::DrawCurve()
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virtual void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
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const VECTOR2D& controlPointB, const VECTOR2D& endPoint ) override;
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/// @copydoc GAL::DrawBitmap()
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virtual void DrawBitmap( const BITMAP_BASE& aBitmap ) override;
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/// @copydoc GAL::BitmapText()
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virtual void BitmapText( const wxString& aText, const VECTOR2D& aPosition,
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double aRotationAngle ) override;
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/// @copydoc GAL::DrawGrid()
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virtual void DrawGrid() override;
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// --------------
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// Screen methods
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// --------------
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/// @brief Resizes the canvas.
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virtual void ResizeScreen( int aWidth, int aHeight ) override;
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/// @brief Shows/hides the GAL canvas
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virtual bool Show( bool aShow ) override;
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/// @copydoc GAL::Flush()
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virtual void Flush() override;
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/// @copydoc GAL::ClearScreen()
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virtual void ClearScreen( ) override;
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// --------------
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// Transformation
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// --------------
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/// @copydoc GAL::Transform()
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virtual void Transform( const MATRIX3x3D& aTransformation ) override;
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/// @copydoc GAL::Rotate()
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virtual void Rotate( double aAngle ) override;
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/// @copydoc GAL::Translate()
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virtual void Translate( const VECTOR2D& aTranslation ) override;
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/// @copydoc GAL::Scale()
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virtual void Scale( const VECTOR2D& aScale ) override;
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/// @copydoc GAL::Save()
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virtual void Save() override;
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/// @copydoc GAL::Restore()
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virtual void Restore() override;
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// --------------------------------------------
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// Group methods
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// ---------------------------------------------
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/// @copydoc GAL::BeginGroup()
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virtual int BeginGroup() override;
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/// @copydoc GAL::EndGroup()
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virtual void EndGroup() override;
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/// @copydoc GAL::DrawGroup()
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virtual void DrawGroup( int aGroupNumber ) override;
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/// @copydoc GAL::ChangeGroupColor()
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virtual void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor ) override;
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/// @copydoc GAL::ChangeGroupDepth()
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virtual void ChangeGroupDepth( int aGroupNumber, int aDepth ) override;
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/// @copydoc GAL::DeleteGroup()
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virtual void DeleteGroup( int aGroupNumber ) override;
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/// @copydoc GAL::ClearCache()
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virtual void ClearCache() override;
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// --------------------------------------------------------
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// Handling the world <-> screen transformation
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// --------------------------------------------------------
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/// @copydoc GAL::SaveScreen()
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virtual void SaveScreen() override;
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/// @copydoc GAL::RestoreScreen()
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virtual void RestoreScreen() override;
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/// @copydoc GAL::SetTarget()
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virtual void SetTarget( RENDER_TARGET aTarget ) override;
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/// @copydoc GAL::GetTarget()
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virtual RENDER_TARGET GetTarget() const override;
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/// @copydoc GAL::ClearTarget()
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virtual void ClearTarget( RENDER_TARGET aTarget ) override;
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/// @copydoc GAL::SetNegativeDrawMode()
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virtual void SetNegativeDrawMode( bool aSetting ) override {}
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virtual void ComputeWorldScreenMatrix() override;
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// -------
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// Cursor
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// -------
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/// @copydoc GAL::DrawCursor()
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virtual void DrawCursor( const VECTOR2D& aCursorPosition ) override;
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/**
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* @brief Function PostPaint
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* posts an event to m_paint_listener. A post is used so that the actual drawing
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* function can use a device context type that is not specific to the wxEVT_PAINT event.
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*/
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void PostPaint()
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{
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if( paintListener )
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{
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wxPaintEvent redrawEvent;
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wxPostEvent( paintListener, redrawEvent );
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}
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}
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void SetMouseListener( wxEvtHandler* aMouseListener )
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{
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mouseListener = aMouseListener;
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}
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void SetPaintListener( wxEvtHandler* aPaintListener )
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{
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paintListener = aPaintListener;
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}
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virtual void EnableDepthTest( bool aEnabled = false ) override;
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///< Parameters passed to the GLU tesselator
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typedef struct
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{
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/// Manager used for storing new vertices
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VERTEX_MANAGER* vboManager;
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/// Intersect points, that have to be freed after tessellation
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std::deque< boost::shared_array<GLdouble> >& intersectPoints;
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} TessParams;
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private:
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/// Super class definition
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typedef GAL super;
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static const int CIRCLE_POINTS = 64; ///< The number of points for circle approximation
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static const int CURVE_POINTS = 32; ///< The number of points for curve approximation
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static wxGLContext* glMainContext; ///< Parent OpenGL context
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wxGLContext* glPrivContext; ///< Canvas-specific OpenGL context
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static int instanceCounter; ///< GL GAL instance counter
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wxEvtHandler* mouseListener;
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wxEvtHandler* paintListener;
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static GLuint fontTexture; ///< Bitmap font texture handle (shared)
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// Vertex buffer objects related fields
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typedef std::unordered_map< unsigned int, std::shared_ptr<VERTEX_ITEM> > GROUPS_MAP;
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GROUPS_MAP groups; ///< Stores informations about VBO objects (groups)
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unsigned int groupCounter; ///< Counter used for generating keys for groups
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VERTEX_MANAGER* currentManager; ///< Currently used VERTEX_MANAGER (for storing VERTEX_ITEMs)
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VERTEX_MANAGER* cachedManager; ///< Container for storing cached VERTEX_ITEMs
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VERTEX_MANAGER* nonCachedManager; ///< Container for storing non-cached VERTEX_ITEMs
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VERTEX_MANAGER* overlayManager; ///< Container for storing overlaid VERTEX_ITEMs
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// Framebuffer & compositing
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OPENGL_COMPOSITOR* compositor; ///< Handles multiple rendering targets
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unsigned int mainBuffer; ///< Main rendering target
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unsigned int overlayBuffer; ///< Auxiliary rendering target (for menus etc.)
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RENDER_TARGET currentTarget; ///< Current rendering target
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// Shader
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SHADER* shader; ///< There is only one shader used for different objects
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// Internal flags
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bool isFramebufferInitialized; ///< Are the framebuffers initialized?
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static bool isBitmapFontLoaded; ///< Is the bitmap font texture loaded?
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bool isBitmapFontInitialized; ///< Is the shader set to use bitmap fonts?
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bool isInitialized; ///< Basic initialization flag, has to be done
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///< when the window is visible
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bool isGrouping; ///< Was a group started?
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bool isContextLocked; ///< Used for assertion checking
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int lockClientCookie;
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GLint ufm_worldPixelSize;
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GLint ufm_screenPixelSize;
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GLint ufm_pixelSizeMultiplier;
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std::unique_ptr<GL_BITMAP_CACHE> bitmapCache;
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void lockContext( int aClientCookie ) override;
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void unlockContext( int aClientCookie ) override;
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/// @copydoc GAL::BeginUpdate()
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virtual void beginUpdate() override;
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/// @copydoc GAL::EndUpdate()
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virtual void endUpdate() override;
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/// @copydoc GAL::BeginDrawing()
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virtual void beginDrawing() override;
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/// @copydoc GAL::EndDrawing()
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virtual void endDrawing() override;
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///< Update handler for OpenGL settings
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bool updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions ) override;
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// Polygon tesselation
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/// The tessellator
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GLUtesselator* tesselator;
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/// Storage for intersecting points
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std::deque< boost::shared_array<GLdouble> > tessIntersects;
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/**
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* @brief Draw a quad for the line.
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*
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* @param aStartPoint is the start point of the line.
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* @param aEndPoint is the end point of the line.
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*/
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void drawLineQuad( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
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/**
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* @brief Draw a semicircle. Depending on settings (isStrokeEnabled & isFilledEnabled) it runs
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* the proper function (drawStrokedSemiCircle or drawFilledSemiCircle).
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*
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* @param aCenterPoint is the center point.
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* @param aRadius is the radius of the semicircle.
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* @param aAngle is the angle of the semicircle.
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*
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*/
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void drawSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle );
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/**
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* @brief Draw a filled semicircle.
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*
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* @param aCenterPoint is the center point.
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* @param aRadius is the radius of the semicircle.
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* @param aAngle is the angle of the semicircle.
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*
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*/
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void drawFilledSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle );
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/**
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* @brief Draw a stroked semicircle.
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*
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* @param aCenterPoint is the center point.
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* @param aRadius is the radius of the semicircle.
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* @param aAngle is the angle of the semicircle.
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*
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*/
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void drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle );
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/**
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* @brief Generic way of drawing a polyline stored in different containers.
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* @param aPointGetter is a function to obtain coordinates of n-th vertex.
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* @param aPointCount is the number of points to be drawn.
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*/
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void drawPolyline( const std::function<VECTOR2D (int)>& aPointGetter, int aPointCount );
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/**
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* @brief Draws a filled polygon. It does not need the last point to have the same coordinates
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* as the first one.
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* @param aPoints is the vertices data (3 coordinates: x, y, z).
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* @param aPointCount is the number of points.
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*/
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void drawPolygon( GLdouble* aPoints, int aPointCount );
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/**
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* @brief Draws a set of polygons with a cached triangulation. Way faster than drawPolygon.
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*/
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void drawTriangulatedPolyset( const SHAPE_POLY_SET& aPoly );
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/**
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* @brief Draws a single character using bitmap font.
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* Its main purpose is to be used in BitmapText() function.
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*
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* @param aChar is the character to be drawn.
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* @return Width of the drawn glyph.
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*/
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int drawBitmapChar( unsigned long aChar );
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/**
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* @brief Draws an overbar over the currently drawn text.
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* Its main purpose is to be used in BitmapText() function.
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* This method requires appropriate scaling to be applied (as is done in BitmapText() function).
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* The current X coordinate will be the overbar ending.
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*
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* @param aLength is the width of the overbar.
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* @param aHeight is the height for the overbar.
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*/
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void drawBitmapOverbar( double aLength, double aHeight );
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/**
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* @brief Computes a size of text drawn using bitmap font with current text setting applied.
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*
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* @param aText is the text to be drawn.
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* @return Pair containing text bounding box and common Y axis offset. The values are expressed
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* as a number of pixels on the bitmap font texture and need to be scaled before drawing.
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*/
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std::pair<VECTOR2D, float> computeBitmapTextSize( const UTF8& aText ) const;
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// Event handling
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/**
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* @brief This is the OnPaint event handler.
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*
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* @param aEvent is the OnPaint event.
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*/
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void onPaint( wxPaintEvent& aEvent );
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/**
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* @brief Skip the mouse event to the parent.
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*
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* @param aEvent is the mouse event.
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*/
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void skipMouseEvent( wxMouseEvent& aEvent );
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/**
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* @brief Blits cursor into the current screen.
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*/
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void blitCursor();
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/**
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* @brief Returns a valid key that can be used as a new group number.
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*
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* @return An unique group number that is not used by any other group.
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*/
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unsigned int getNewGroupNumber();
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/**
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* @brief Compute the angle step when drawing arcs/circles approximated with lines.
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*/
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double calcAngleStep( double aRadius ) const
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{
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// Bigger arcs need smaller alpha increment to make them look smooth
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return std::min( 1e6 / aRadius, 2.0 * M_PI / CIRCLE_POINTS );
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}
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double getWorldPixelSize() const;
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VECTOR2D getScreenPixelSize() const;
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/**
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* @brief Basic OpenGL initialization.
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*/
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void init();
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};
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} // namespace KIGFX
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#endif // OPENGLGAL_H_
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