kicad/include/gal/opengl/opengl_gal.h

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C++

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