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kicad/include/gal/opengl/opengl_gal.h

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/*
* 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) 2020-2021 KiCad Developers, see AUTHORS.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 <gal/hidpi_gl_canvas.h>
#include <unordered_map>
#include <boost/smart_ptr/shared_array.hpp>
#include <memory>
#include <wx/event.h>
#ifndef CALLBACK
#define CALLBACK
#endif
///< The default number of points for circle approximation
#define SEG_PER_CIRCLE_COUNT 64
struct bitmap_glyph;
namespace KIGFX
{
class SHADER;
class GL_BITMAP_CACHE;
/**
* 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 HIDPI_GL_CANVAS
{
public:
/**
* @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" ) );
~OPENGL_GAL();
/**
* Checks OpenGL features.
*
* @param aOptions
* @return wxEmptyString if OpenGL 2.1 or greater is available, otherwise returns error message
*/
static wxString CheckFeatures( GAL_DISPLAY_OPTIONS& aOptions );
bool IsOpenGlEngine() override { return true; }
/// @copydoc GAL::IsInitialized()
bool IsInitialized() const override
{
// is*Initialized flags, but it is enough for OpenGL to show up
return IsShownOnScreen() && !GetClientRect().IsEmpty();
}
///< @copydoc GAL::IsVisible()
bool IsVisible() const override
{
return IsShownOnScreen() && !GetClientRect().IsEmpty();
}
// ---------------
// Drawing methods
// ---------------
/// @copydoc GAL::DrawLine()
void DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
/// @copydoc GAL::DrawSegment()
void DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
double aWidth ) override;
/// @copydoc GAL::DrawCircle()
void DrawCircle( const VECTOR2D& aCenterPoint, double aRadius ) override;
/// @copydoc GAL::DrawArc()
void DrawArc( const VECTOR2D& aCenterPoint, double aRadius,
double aStartAngle, double aEndAngle ) override;
/// @copydoc GAL::DrawArcSegment()
void DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius,
double aStartAngle, double aEndAngle, double aWidth,
double aMaxError ) override;
/// @copydoc GAL::DrawRectangle()
void DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint ) override;
/// @copydoc GAL::DrawPolyline()
void DrawPolyline( const std::deque<VECTOR2D>& aPointList ) override;
void DrawPolyline( const VECTOR2D aPointList[], int aListSize ) override;
void DrawPolyline( const SHAPE_LINE_CHAIN& aLineChain ) override;
/// @copydoc GAL::DrawPolygon()
void DrawPolygon( const std::deque<VECTOR2D>& aPointList ) override;
void DrawPolygon( const VECTOR2D aPointList[], int aListSize ) override;
void DrawPolygon( const SHAPE_POLY_SET& aPolySet, bool aStrokeTriangulation = false ) override;
void DrawPolygon( const SHAPE_LINE_CHAIN& aPolySet ) override;
/// @copydoc GAL::DrawCurve()
void DrawCurve( const VECTOR2D& startPoint, const VECTOR2D& controlPointA,
const VECTOR2D& controlPointB, const VECTOR2D& endPoint,
double aFilterValue = 0.0 ) override;
/// @copydoc GAL::DrawBitmap()
void DrawBitmap( const BITMAP_BASE& aBitmap ) override;
/// @copydoc GAL::BitmapText()
void BitmapText( const wxString& aText, const VECTOR2D& aPosition,
double aRotationAngle ) override;
/// @copydoc GAL::DrawGrid()
void DrawGrid() override;
// --------------
// Screen methods
// --------------
/// @brief Resizes the canvas.
void ResizeScreen( int aWidth, int aHeight ) override;
/// @brief Shows/hides the GAL canvas
bool Show( bool aShow ) override;
/// @copydoc GAL::Flush()
void Flush() override;
/// @copydoc GAL::ClearScreen()
void ClearScreen( ) override;
// --------------
// Transformation
// --------------
/// @copydoc GAL::Transform()
void Transform( const MATRIX3x3D& aTransformation ) override;
/// @copydoc GAL::Rotate()
void Rotate( double aAngle ) override;
/// @copydoc GAL::Translate()
void Translate( const VECTOR2D& aTranslation ) override;
/// @copydoc GAL::Scale()
void Scale( const VECTOR2D& aScale ) override;
/// @copydoc GAL::Save()
void Save() override;
/// @copydoc GAL::Restore()
void Restore() override;
// --------------------------------------------
// Group methods
// ---------------------------------------------
/// @copydoc GAL::BeginGroup()
int BeginGroup() override;
/// @copydoc GAL::EndGroup()
void EndGroup() override;
/// @copydoc GAL::DrawGroup()
void DrawGroup( int aGroupNumber ) override;
/// @copydoc GAL::ChangeGroupColor()
void ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor ) override;
/// @copydoc GAL::ChangeGroupDepth()
void ChangeGroupDepth( int aGroupNumber, int aDepth ) override;
/// @copydoc GAL::DeleteGroup()
void DeleteGroup( int aGroupNumber ) override;
/// @copydoc GAL::ClearCache()
void ClearCache() override;
// --------------------------------------------------------
// Handling the world <-> screen transformation
// --------------------------------------------------------
/// @copydoc GAL::SetTarget()
void SetTarget( RENDER_TARGET aTarget ) override;
/// @copydoc GAL::GetTarget()
RENDER_TARGET GetTarget() const override;
/// @copydoc GAL::ClearTarget()
void ClearTarget( RENDER_TARGET aTarget ) override;
/// @copydoc GAL::HasTarget()
virtual bool HasTarget( RENDER_TARGET aTarget ) override;
/// @copydoc GAL::SetNegativeDrawMode()
void SetNegativeDrawMode( bool aSetting ) override {}
/// @copydoc GAL::StartDiffLayer()
void StartDiffLayer() override;
//
/// @copydoc GAL::EndDiffLayer()
void EndDiffLayer() override;
void ComputeWorldScreenMatrix() override;
// -------
// Cursor
// -------
/// @copydoc GAL::SetNativeCursorStyle()
bool SetNativeCursorStyle( KICURSOR aCursor ) override;
/// @copydoc GAL::DrawCursor()
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,
* just by changing the PostPaint code.
*/
void PostPaint( wxPaintEvent& aEvent );
void SetMouseListener( wxEvtHandler* aMouseListener )
{
m_mouseListener = aMouseListener;
}
void SetPaintListener( wxEvtHandler* aPaintListener )
{
m_paintListener = aPaintListener;
}
void EnableDepthTest( bool aEnabled = false ) override;
bool IsContextLocked() override
{
return m_isContextLocked;
}
void LockContext( int aClientCookie ) override;
void UnlockContext( int aClientCookie ) override;
/// @copydoc GAL::BeginDrawing()
void BeginDrawing() override;
/// @copydoc GAL::EndDrawing()
void EndDrawing() override;
///< Parameters passed to the GLU tesselator
struct TessParams
{
/// 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;
};
private:
/// Super class definition
typedef GAL super;
static wxGLContext* m_glMainContext; ///< Parent OpenGL context
wxGLContext* m_glPrivContext; ///< Canvas-specific OpenGL context
static int m_instanceCounter; ///< GL GAL instance counter
wxEvtHandler* m_mouseListener;
wxEvtHandler* m_paintListener;
static GLuint g_fontTexture; ///< Bitmap font texture handle (shared)
// Vertex buffer objects related fields
typedef std::unordered_map< unsigned int, std::shared_ptr<VERTEX_ITEM> > GROUPS_MAP;
GROUPS_MAP m_groups; ///< Stores information about VBO objects (groups)
unsigned int m_groupCounter; ///< Counter used for generating keys for groups
VERTEX_MANAGER* m_currentManager; ///< Currently used VERTEX_MANAGER (for storing
///< VERTEX_ITEMs).
VERTEX_MANAGER* m_cachedManager; ///< Container for storing cached VERTEX_ITEMs
VERTEX_MANAGER* m_nonCachedManager; ///< Container for storing non-cached VERTEX_ITEMs
VERTEX_MANAGER* m_overlayManager; ///< Container for storing overlaid VERTEX_ITEMs
VERTEX_MANAGER* m_tempManager; ///< Container for storing temp (diff mode) VERTEX_ITEMs
// Framebuffer & compositing
OPENGL_COMPOSITOR* m_compositor; ///< Handles multiple rendering targets
unsigned int m_mainBuffer; ///< Main rendering target
unsigned int m_overlayBuffer; ///< Auxiliary rendering target (for menus etc.)
unsigned int m_tempBuffer; ///< Temporary rendering target (for diffing etc.)
RENDER_TARGET m_currentTarget; ///< Current rendering target
// Shader
SHADER* m_shader; ///< There is only one shader used for different
///< objects.
// Internal flags
bool m_isFramebufferInitialized; ///< Are the framebuffers initialized?
static bool m_isBitmapFontLoaded; ///< Is the bitmap font texture loaded?
bool m_isBitmapFontInitialized; ///< Is the shader set to use bitmap fonts?
bool m_isInitialized; ///< Basic initialization flag, has to be
///< done when the window is visible
bool m_isGrouping; ///< Was a group started?
bool m_isContextLocked; ///< Used for assertion checking
int m_lockClientCookie;
GLint ufm_worldPixelSize;
GLint ufm_screenPixelSize;
GLint ufm_pixelSizeMultiplier;
GLint ufm_antialiasingOffset;
wxCursor m_currentwxCursor; ///< wxCursor showing the current native cursor
std::unique_ptr<GL_BITMAP_CACHE> m_bitmapCache;
// Polygon tesselation
GLUtesselator* m_tesselator;
std::deque< boost::shared_array<GLdouble> > m_tessIntersects;
/// @copydoc GAL::BeginUpdate()
void beginUpdate() override;
/// @copydoc GAL::EndUpdate()
void endUpdate() override;
///< Update handler for OpenGL settings
bool updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions ) override;
/**
* @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 );
/**
* Draw a semicircle.
*
* Depending on settings (m_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 );
/**
*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 );
/**
* 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 );
/**
* 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( const std::function<VECTOR2D (int)>& aPointGetter, int aPointCount );
/**
* Draw 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 );
/**
* Draw a set of polygons with a cached triangulation. Way faster than drawPolygon.
*
* @param aStrokeTriangulation indicates the triangulation should be stroked rather than
* filled. Used for debugging.
*/
void drawTriangulatedPolyset( const SHAPE_POLY_SET& aPoly, bool aStrokeTriangulation );
/**
* Draw a single character using bitmap font.
*
* Its main purpose is to be used in BitmapText() function.
*
* @param aChar is the character to be drawn.
* @return Width of the drawn glyph.
*/
int drawBitmapChar( unsigned long aChar );
/**
* Draw 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 );
/**
* Compute 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 UTF8& aText ) const;
// Event handling
/**
* This is the OnPaint event handler.
*
* @param aEvent is the OnPaint event.
*/
void onPaint( wxPaintEvent& aEvent );
/**
* Skip the mouse event to the parent.
*
* @param aEvent is the mouse event.
*/
void skipMouseEvent( wxMouseEvent& aEvent );
/**
* Give the correct cursor image when the native widget asks for it.
*
* @param aEvent is the cursor event to plac the cursor into.
*/
void onSetNativeCursor( wxSetCursorEvent& aEvent );
/**
* Blit cursor into the current screen.
*/
void blitCursor();
/**
* Return 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();
/**
* 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 / SEG_PER_CIRCLE_COUNT );
}
double getWorldPixelSize() const;
VECTOR2D getScreenPixelSize() const;
/**
* Basic OpenGL initialization and feature checks.
*
* @throw std::runtime_error if any of the OpenGL feature checks failed
*/
void init();
};
} // namespace KIGFX
#endif // OPENGLGAL_H_
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