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kicad/common/gal/opengl/opengl_gal.cpp

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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) 2012-2021 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
*/
// Apple, in their infinite wisdom, has decided to mark OpenGL as deprecated.
// Luckily we can silence warnings about its deprecation.
#ifdef __APPLE__
#define GL_SILENCE_DEPRECATION 1
#endif
#include <gl_utils.h>
#include <advanced_config.h>
#include <gal/opengl/opengl_gal.h>
#include <gal/opengl/utils.h>
#include <gal/definitions.h>
#include <gl_context_mgr.h>
#include <geometry/shape_poly_set.h>
#include <bitmap_base.h>
#include <bezier_curves.h>
#include <math/util.h> // for KiROUND
#include <trace_helpers.h>
#include <wx/frame.h>
#include <macros.h>
#include <geometry/geometry_utils.h>
#include <profile.h>
#include <trace_helpers.h>
#include <functional>
#include <limits>
#include <memory>
using namespace std::placeholders;
using namespace KIGFX;
// A ugly workaround to avoid serious issues (crashes) when using bitmaps cache
// to speedup redraw.
// issues arise when using bitmaps in page layout, when the page layout containd bitmaps,
// and is common to schematic and board editor,
// and the schematic is a hierarchy and when using cross-probing
// When the cross probing from pcbnew to eeschema switches to a sheet, the bitmaps cache
// becomes broken (in fact the associated texture).
// I hope (JPC) it will be fixed later, but a slightly slower refresh is better than a crash
#define DISABLE_BITMAP_CACHE
// The current font is "Ubuntu Mono" available under Ubuntu Font Licence 1.0
// (see ubuntu-font-licence-1.0.txt for details)
#include "gl_resources.h"
#include "gl_builtin_shaders.h"
using namespace KIGFX::BUILTIN_FONT;
static void InitTesselatorCallbacks( GLUtesselator* aTesselator );
static const int glAttributes[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_DEPTH_SIZE, 8, 0 };
wxGLContext* OPENGL_GAL::m_glMainContext = nullptr;
int OPENGL_GAL::m_instanceCounter = 0;
GLuint OPENGL_GAL::g_fontTexture = 0;
bool OPENGL_GAL::m_isBitmapFontLoaded = false;
namespace KIGFX
{
class GL_BITMAP_CACHE
{
public:
GL_BITMAP_CACHE() {}
~GL_BITMAP_CACHE();
GLuint RequestBitmap( const BITMAP_BASE* aBitmap );
private:
struct CACHED_BITMAP
{
GLuint id;
int w, h;
};
GLuint cacheBitmap( const BITMAP_BASE* aBitmap );
std::map<const BITMAP_BASE*, CACHED_BITMAP> m_bitmaps;
};
}; // namespace KIGFX
GL_BITMAP_CACHE::~GL_BITMAP_CACHE()
{
for( auto& bitmap : m_bitmaps )
glDeleteTextures( 1, &bitmap.second.id );
}
GLuint GL_BITMAP_CACHE::RequestBitmap( const BITMAP_BASE* aBitmap )
{
auto it = m_bitmaps.find( aBitmap );
if( it != m_bitmaps.end() )
{
// A bitmap is found in cache bitmap.
// Ensure the associated texture is still valid (can be destroyed somewhere)
if( glIsTexture( it->second.id ) )
return it->second.id;
// else if not valid, it will be recreated.
}
return cacheBitmap( aBitmap );
}
GLuint GL_BITMAP_CACHE::cacheBitmap( const BITMAP_BASE* aBitmap )
{
CACHED_BITMAP bmp;
bmp.w = aBitmap->GetSizePixels().x;
bmp.h = aBitmap->GetSizePixels().y;
// The bitmap size needs to be a multiple of 4.
// This is easiest to achieve by ensuring that each row
// has a multiple of 4 pixels
int extra_w = bmp.w % 4;
if( extra_w )
extra_w = 4 - extra_w;
GLuint textureID;
glGenTextures( 1, &textureID );
// make_unique initializes this to 0, so extra pixels are transparent
auto buf = std::make_unique<uint8_t[]>( ( bmp.w + extra_w ) * bmp.h * 4 );
const wxImage& imgData = *aBitmap->GetImageData();
for( int y = 0; y < bmp.h; y++ )
{
for( int x = 0; x < bmp.w; x++ )
{
uint8_t* p = buf.get() + ( ( bmp.w + extra_w ) * y + x ) * 4;
p[0] = imgData.GetRed( x, y );
p[1] = imgData.GetGreen( x, y );
p[2] = imgData.GetBlue( x, y );
if( imgData.HasAlpha() )
p[3] = imgData.GetAlpha( x, y );
else if( imgData.HasMask() && p[0] == imgData.GetMaskRed()
&& p[1] == imgData.GetMaskGreen() && p[2] == imgData.GetMaskBlue() )
p[3] = wxALPHA_TRANSPARENT;
else
p[3] = wxALPHA_OPAQUE;
}
}
glBindTexture( GL_TEXTURE_2D, textureID );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, bmp.w + extra_w, bmp.h, 0, GL_RGBA, GL_UNSIGNED_BYTE,
buf.get() );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
bmp.id = textureID;
#ifndef DISABLE_BITMAP_CACHE
m_bitmaps[aBitmap] = bmp;
#endif
return textureID;
}
OPENGL_GAL::OPENGL_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions, wxWindow* aParent,
wxEvtHandler* aMouseListener, wxEvtHandler* aPaintListener,
const wxString& aName ) :
GAL( aDisplayOptions ),
HIDPI_GL_CANVAS( aParent, wxID_ANY, (int*) glAttributes, wxDefaultPosition, wxDefaultSize,
wxEXPAND, aName ),
m_mouseListener( aMouseListener ),
m_paintListener( aPaintListener ),
m_currentManager( nullptr ),
m_cachedManager( nullptr ),
m_nonCachedManager( nullptr ),
m_overlayManager( nullptr ),
m_tempManager( nullptr ),
m_mainBuffer( 0 ),
m_overlayBuffer( 0 ),
m_tempBuffer( 0 ),
m_isContextLocked( false ),
m_lockClientCookie( 0 )
{
if( m_glMainContext == nullptr )
{
m_glMainContext = GL_CONTEXT_MANAGER::Get().CreateCtx( this );
m_glPrivContext = m_glMainContext;
}
else
{
m_glPrivContext = GL_CONTEXT_MANAGER::Get().CreateCtx( this, m_glMainContext );
}
m_shader = new SHADER();
++m_instanceCounter;
m_bitmapCache = std::make_unique<GL_BITMAP_CACHE>();
m_compositor = new OPENGL_COMPOSITOR;
m_compositor->SetAntialiasingMode( m_options.gl_antialiasing_mode );
// Initialize the flags
m_isFramebufferInitialized = false;
m_isBitmapFontInitialized = false;
m_isInitialized = false;
m_isGrouping = false;
m_groupCounter = 0;
// Connect the native cursor handler
Connect( wxEVT_SET_CURSOR, wxSetCursorEventHandler( OPENGL_GAL::onSetNativeCursor ), nullptr,
this );
// Connecting the event handlers
Connect( wxEVT_PAINT, wxPaintEventHandler( OPENGL_GAL::onPaint ) );
// Mouse events are skipped to the parent
Connect( wxEVT_MOTION, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DOWN, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_UP, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DCLICK, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DOWN, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_UP, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DCLICK, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DOWN, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_UP, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DCLICK, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_MOUSEWHEEL, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
#if wxCHECK_VERSION( 3, 1, 0 ) || defined( USE_OSX_MAGNIFY_EVENT )
Connect( wxEVT_MAGNIFY, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
#endif
#if defined _WIN32 || defined _WIN64
Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
#endif
SetSize( aParent->GetClientSize() );
m_screenSize = VECTOR2I( GetNativePixelSize() );
// Grid color settings are different in Cairo and OpenGL
SetGridColor( COLOR4D( 0.8, 0.8, 0.8, 0.1 ) );
SetAxesColor( COLOR4D( BLUE ) );
// Tesselator initialization
m_tesselator = gluNewTess();
InitTesselatorCallbacks( m_tesselator );
gluTessProperty( m_tesselator, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_POSITIVE );
SetTarget( TARGET_NONCACHED );
// Avoid uninitialized variables:
ufm_worldPixelSize = 1;
ufm_screenPixelSize = 1;
ufm_pixelSizeMultiplier = 1;
ufm_antialiasingOffset = 1;
}
OPENGL_GAL::~OPENGL_GAL()
{
GL_CONTEXT_MANAGER::Get().LockCtx( m_glPrivContext, this );
--m_instanceCounter;
glFlush();
gluDeleteTess( m_tesselator );
ClearCache();
delete m_compositor;
if( m_isInitialized )
{
delete m_cachedManager;
delete m_nonCachedManager;
delete m_overlayManager;
delete m_tempManager;
}
GL_CONTEXT_MANAGER::Get().UnlockCtx( m_glPrivContext );
// If it was the main context, then it will be deleted
// when the last OpenGL GAL instance is destroyed (a few lines below)
if( m_glPrivContext != m_glMainContext )
GL_CONTEXT_MANAGER::Get().DestroyCtx( m_glPrivContext );
delete m_shader;
// Are we destroying the last GAL instance?
if( m_instanceCounter == 0 )
{
GL_CONTEXT_MANAGER::Get().LockCtx( m_glMainContext, this );
if( m_isBitmapFontLoaded )
{
glDeleteTextures( 1, &g_fontTexture );
m_isBitmapFontLoaded = false;
}
GL_CONTEXT_MANAGER::Get().UnlockCtx( m_glMainContext );
GL_CONTEXT_MANAGER::Get().DestroyCtx( m_glMainContext );
m_glMainContext = nullptr;
}
}
wxString OPENGL_GAL::CheckFeatures( GAL_DISPLAY_OPTIONS& aOptions )
{
wxString retVal = wxEmptyString;
wxFrame* testFrame = new wxFrame( nullptr, wxID_ANY, wxEmptyString, wxDefaultPosition,
wxSize( 1, 1 ), wxFRAME_TOOL_WINDOW | wxNO_BORDER );
KIGFX::OPENGL_GAL* opengl_gal = nullptr;
try
{
opengl_gal = new KIGFX::OPENGL_GAL( aOptions, testFrame );
testFrame->Raise();
testFrame->Show();
GAL_CONTEXT_LOCKER lock( opengl_gal );
opengl_gal->init();
}
catch( std::runtime_error& err )
{
//Test failed
retVal = wxString( err.what() );
}
delete opengl_gal;
delete testFrame;
return retVal;
}
void OPENGL_GAL::PostPaint( wxPaintEvent& aEvent )
{
// posts an event to m_paint_listener to ask for redraw the canvas.
if( m_paintListener )
wxPostEvent( m_paintListener, aEvent );
}
bool OPENGL_GAL::updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions )
{
GAL_CONTEXT_LOCKER lock( this );
bool refresh = false;
if( m_options.gl_antialiasing_mode != m_compositor->GetAntialiasingMode() )
{
m_compositor->SetAntialiasingMode( m_options.gl_antialiasing_mode );
m_isFramebufferInitialized = false;
refresh = true;
}
if( m_options.m_scaleFactor != GetScaleFactor() )
{
SetScaleFactor( m_options.m_scaleFactor );
refresh = true;
}
if( super::updatedGalDisplayOptions( aOptions ) || refresh )
{
Refresh();
refresh = true;
}
return refresh;
}
double OPENGL_GAL::getWorldPixelSize() const
{
MATRIX3x3D matrix = GetScreenWorldMatrix();
return std::min( std::abs( matrix.GetScale().x ), std::abs( matrix.GetScale().y ) );
}
VECTOR2D OPENGL_GAL::getScreenPixelSize() const
{
double sf = GetScaleFactor();
return VECTOR2D( 2.0 / (double) ( m_screenSize.x * sf ), 2.0 /
(double) ( m_screenSize.y * sf ) );
}
void OPENGL_GAL::BeginDrawing()
{
#ifdef KICAD_GAL_PROFILE
PROF_COUNTER totalRealTime( "OPENGL_GAL::beginDrawing()", true );
#endif /* KICAD_GAL_PROFILE */
wxASSERT_MSG( m_isContextLocked, "GAL_DRAWING_CONTEXT RAII object should have locked context. "
"Calling GAL::beginDrawing() directly is not allowed." );
wxASSERT_MSG( IsVisible(), "GAL::beginDrawing() must not be entered when GAL is not visible. "
"Other drawing routines will expect everything to be initialized "
"which will not be the case." );
if( !m_isInitialized )
init();
// Set up the view port
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
// Create the screen transformation (Do the RH-LH conversion here)
glOrtho( 0, (GLint) m_screenSize.x, (GLsizei) m_screenSize.y, 0,
-m_depthRange.x, -m_depthRange.y );
if( !m_isFramebufferInitialized )
{
// Prepare rendering target buffers
m_compositor->Initialize();
m_mainBuffer = m_compositor->CreateBuffer();
m_tempBuffer = m_compositor->CreateBuffer();
try
{
m_overlayBuffer = m_compositor->CreateBuffer();
}
catch( const std::runtime_error& )
{
wxLogVerbose( wxT( "Could not create a framebuffer for overlays.\n" ) );
m_overlayBuffer = 0;
}
m_isFramebufferInitialized = true;
}
m_compositor->Begin();
// Disable 2D Textures
glDisable( GL_TEXTURE_2D );
glShadeModel( GL_FLAT );
// Enable the depth buffer
glEnable( GL_DEPTH_TEST );
glDepthFunc( GL_LESS );
// Setup blending, required for transparent objects
glEnable( GL_BLEND );
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
glMatrixMode( GL_MODELVIEW );
// Set up the world <-> screen transformation
ComputeWorldScreenMatrix();
GLdouble matrixData[16] = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 };
matrixData[0] = m_worldScreenMatrix.m_data[0][0];
matrixData[1] = m_worldScreenMatrix.m_data[1][0];
matrixData[2] = m_worldScreenMatrix.m_data[2][0];
matrixData[4] = m_worldScreenMatrix.m_data[0][1];
matrixData[5] = m_worldScreenMatrix.m_data[1][1];
matrixData[6] = m_worldScreenMatrix.m_data[2][1];
matrixData[12] = m_worldScreenMatrix.m_data[0][2];
matrixData[13] = m_worldScreenMatrix.m_data[1][2];
matrixData[14] = m_worldScreenMatrix.m_data[2][2];
glLoadMatrixd( matrixData );
// Set defaults
SetFillColor( m_fillColor );
SetStrokeColor( m_strokeColor );
// Remove all previously stored items
m_nonCachedManager->Clear();
m_overlayManager->Clear();
m_tempManager->Clear();
m_cachedManager->BeginDrawing();
m_nonCachedManager->BeginDrawing();
m_overlayManager->BeginDrawing();
m_tempManager->BeginDrawing();
if( !m_isBitmapFontInitialized )
{
// Keep bitmap font texture always bound to the second texturing unit
const GLint FONT_TEXTURE_UNIT = 2;
// Either load the font atlas to video memory, or simply bind it to a texture unit
if( !m_isBitmapFontLoaded )
{
glActiveTexture( GL_TEXTURE0 + FONT_TEXTURE_UNIT );
glGenTextures( 1, &g_fontTexture );
glBindTexture( GL_TEXTURE_2D, g_fontTexture );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB8, font_image.width, font_image.height, 0, GL_RGB,
GL_UNSIGNED_BYTE, font_image.pixels );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
checkGlError( "loading bitmap font", __FILE__, __LINE__ );
glActiveTexture( GL_TEXTURE0 );
m_isBitmapFontLoaded = true;
}
else
{
glActiveTexture( GL_TEXTURE0 + FONT_TEXTURE_UNIT );
glBindTexture( GL_TEXTURE_2D, g_fontTexture );
glActiveTexture( GL_TEXTURE0 );
}
// Set shader parameter
GLint ufm_fontTexture = m_shader->AddParameter( "fontTexture" );
GLint ufm_fontTextureWidth = m_shader->AddParameter( "fontTextureWidth" );
ufm_worldPixelSize = m_shader->AddParameter( "worldPixelSize" );
ufm_screenPixelSize = m_shader->AddParameter( "screenPixelSize" );
ufm_pixelSizeMultiplier = m_shader->AddParameter( "pixelSizeMultiplier" );
ufm_antialiasingOffset = m_shader->AddParameter( "antialiasingOffset" );
m_shader->Use();
m_shader->SetParameter( ufm_fontTexture, (int) FONT_TEXTURE_UNIT );
m_shader->SetParameter( ufm_fontTextureWidth, (int) font_image.width );
m_shader->Deactivate();
checkGlError( "setting bitmap font sampler as shader parameter", __FILE__, __LINE__ );
m_isBitmapFontInitialized = true;
}
m_shader->Use();
m_shader->SetParameter( ufm_worldPixelSize,
(float) ( getWorldPixelSize() / GetScaleFactor() ) );
const VECTOR2D& screenPixelSize = getScreenPixelSize();
m_shader->SetParameter( ufm_screenPixelSize, screenPixelSize );
double pixelSizeMultiplier = m_compositor->GetAntialiasSupersamplingFactor();
m_shader->SetParameter( ufm_pixelSizeMultiplier, (float) pixelSizeMultiplier );
VECTOR2D renderingOffset = m_compositor->GetAntialiasRenderingOffset();
renderingOffset.x *= screenPixelSize.x;
renderingOffset.y *= screenPixelSize.y;
m_shader->SetParameter( ufm_antialiasingOffset, renderingOffset );
m_shader->Deactivate();
// Something betreen BeginDrawing and EndDrawing seems to depend on
// this texture unit being active, but it does not assure it itself.
glActiveTexture( GL_TEXTURE0 );
// Unbind buffers - set compositor for direct drawing
m_compositor->SetBuffer( OPENGL_COMPOSITOR::DIRECT_RENDERING );
#ifdef KICAD_GAL_PROFILE
totalRealTime.Stop();
wxLogTrace( traceGalProfile, wxT( "OPENGL_GAL::beginDrawing(): %.1f ms" ),
totalRealTime.msecs() );
#endif /* KICAD_GAL_PROFILE */
}
void OPENGL_GAL::EndDrawing()
{
wxASSERT_MSG( m_isContextLocked, wxT( "What happened to the context lock?" ) );
PROF_TIMER cntTotal("gl-end-total");
PROF_TIMER cntEndCached("gl-end-cached");
PROF_TIMER cntEndNoncached("gl-end-noncached");
PROF_TIMER cntEndOverlay("gl-end-overlay");
PROF_TIMER cntComposite("gl-composite");
PROF_TIMER cntSwap("gl-swap");
cntTotal.Start();
// Cached & non-cached containers are rendered to the same buffer
m_compositor->SetBuffer( m_mainBuffer );
cntEndNoncached.Start();
m_nonCachedManager->EndDrawing();
cntEndNoncached.Stop();
cntEndCached.Start();
m_cachedManager->EndDrawing();
cntEndCached.Stop();
cntEndOverlay.Start();
// Overlay container is rendered to a different buffer
if( m_overlayBuffer )
m_compositor->SetBuffer( m_overlayBuffer );
m_overlayManager->EndDrawing();
cntEndOverlay.Stop();
cntComposite.Start();
// Be sure that the framebuffer is not colorized (happens on specific GPU&drivers combinations)
glColor4d( 1.0, 1.0, 1.0, 1.0 );
// Draw the remaining contents, blit the rendering targets to the screen, swap the buffers
m_compositor->DrawBuffer( m_mainBuffer );
if( m_overlayBuffer )
m_compositor->DrawBuffer( m_overlayBuffer );
m_compositor->Present();
blitCursor();
cntComposite.Stop();
cntSwap.Start();
SwapBuffers();
cntSwap.Stop();
cntTotal.Stop();
KI_TRACE( traceGalProfile, wxT( "Timing: %s %s %s %s %s %s\n" ), cntTotal.to_string(),
cntEndCached.to_string(), cntEndNoncached.to_string(), cntEndOverlay.to_string(),
cntComposite.to_string(), cntSwap.to_string() );
}
void OPENGL_GAL::LockContext( int aClientCookie )
{
wxASSERT_MSG( !m_isContextLocked, wxT( "Context already locked." ) );
m_isContextLocked = true;
m_lockClientCookie = aClientCookie;
GL_CONTEXT_MANAGER::Get().LockCtx( m_glPrivContext, this );
}
void OPENGL_GAL::UnlockContext( int aClientCookie )
{
wxASSERT_MSG( m_isContextLocked, "Context not locked. A GAL_CONTEXT_LOCKER RAII object must "
"be stacked rather than making separate lock/unlock calls." );
wxASSERT_MSG( m_lockClientCookie == aClientCookie, "Context was locked by a different client. "
"Should not be possible with RAII objects." );
m_isContextLocked = false;
GL_CONTEXT_MANAGER::Get().UnlockCtx( m_glPrivContext );
}
void OPENGL_GAL::beginUpdate()
{
wxASSERT_MSG( m_isContextLocked, "GAL_UPDATE_CONTEXT RAII object should have locked context. "
"Calling this from anywhere else is not allowed." );
wxASSERT_MSG( IsVisible(), "GAL::beginUpdate() must not be entered when GAL is not visible. "
"Other update routines will expect everything to be initialized "
"which will not be the case." );
if( !m_isInitialized )
init();
m_cachedManager->Map();
}
void OPENGL_GAL::endUpdate()
{
if( !m_isInitialized )
return;
m_cachedManager->Unmap();
}
void OPENGL_GAL::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b, m_strokeColor.a );
drawLineQuad( aStartPoint, aEndPoint );
}
void OPENGL_GAL::DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
double aWidth )
{
VECTOR2D startEndVector = aEndPoint - aStartPoint;
double lineLength = startEndVector.EuclideanNorm();
float startx = aStartPoint.x;
float starty = aStartPoint.y;
float endx = aStartPoint.x + lineLength;
float endy = aStartPoint.y + lineLength;
// Be careful about floating point rounding. As we draw segments in larger and larger
// coordinates, the shader (which uses floats) will lose precision and stop drawing small
// segments. In this case, we need to draw a circle for the minimal segment.
if( startx == endx || starty == endy )
{
DrawCircle( aStartPoint, aWidth / 2 );
return;
}
if( m_isFillEnabled || aWidth == 1.0 )
{
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
SetLineWidth( aWidth );
drawLineQuad( aStartPoint, aEndPoint );
}
else
{
auto lineAngle = startEndVector.Angle();
// Outlined tracks
SetLineWidth( 1.0 );
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b,
m_strokeColor.a );
Save();
m_currentManager->Translate( aStartPoint.x, aStartPoint.y, 0.0 );
m_currentManager->Rotate( lineAngle, 0.0f, 0.0f, 1.0f );
drawLineQuad( VECTOR2D( 0.0, aWidth / 2.0 ), VECTOR2D( lineLength, aWidth / 2.0 ) );
drawLineQuad( VECTOR2D( 0.0, -aWidth / 2.0 ), VECTOR2D( lineLength, -aWidth / 2.0 ) );
// Draw line caps
drawStrokedSemiCircle( VECTOR2D( 0.0, 0.0 ), aWidth / 2, M_PI / 2 );
drawStrokedSemiCircle( VECTOR2D( lineLength, 0.0 ), aWidth / 2, -M_PI / 2 );
Restore();
}
}
void OPENGL_GAL::DrawCircle( const VECTOR2D& aCenterPoint, double aRadius )
{
if( m_isFillEnabled )
{
m_currentManager->Reserve( 3 );
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
/* Draw a triangle that contains the circle, then shade it leaving only the circle.
* Parameters given to Shader() are indices of the triangle's vertices
* (if you want to understand more, check the vertex shader source [shader.vert]).
* Shader uses this coordinates to determine if fragments are inside the circle or not.
* Does the calculations in the vertex shader now (pixel alignment)
* v2
* /\
* //\\
* v0 /_\/_\ v1
*/
m_currentManager->Shader( SHADER_FILLED_CIRCLE, 1.0, aRadius );
m_currentManager->Vertex( aCenterPoint.x, aCenterPoint.y, m_layerDepth );
m_currentManager->Shader( SHADER_FILLED_CIRCLE, 2.0, aRadius );
m_currentManager->Vertex( aCenterPoint.x, aCenterPoint.y, m_layerDepth );
m_currentManager->Shader( SHADER_FILLED_CIRCLE, 3.0, aRadius );
m_currentManager->Vertex( aCenterPoint.x, aCenterPoint.y, m_layerDepth );
}
if( m_isStrokeEnabled )
{
m_currentManager->Reserve( 3 );
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b,
m_strokeColor.a );
/* Draw a triangle that contains the circle, then shade it leaving only the circle.
* Parameters given to Shader() are indices of the triangle's vertices
* (if you want to understand more, check the vertex shader source [shader.vert]).
* and the line width. Shader uses this coordinates to determine if fragments are
* inside the circle or not.
* v2
* /\
* //\\
* v0 /_\/_\ v1
*/
m_currentManager->Shader( SHADER_STROKED_CIRCLE, 1.0, aRadius, m_lineWidth );
m_currentManager->Vertex( aCenterPoint.x, // v0
aCenterPoint.y, m_layerDepth );
m_currentManager->Shader( SHADER_STROKED_CIRCLE, 2.0, aRadius, m_lineWidth );
m_currentManager->Vertex( aCenterPoint.x, // v1
aCenterPoint.y, m_layerDepth );
m_currentManager->Shader( SHADER_STROKED_CIRCLE, 3.0, aRadius, m_lineWidth );
m_currentManager->Vertex( aCenterPoint.x, aCenterPoint.y, // v2
m_layerDepth );
}
}
void OPENGL_GAL::DrawArc( const VECTOR2D& aCenterPoint, double aRadius, double aStartAngle,
double aEndAngle )
{
if( aRadius <= 0 )
return;
// Swap the angles, if start angle is greater than end angle
SWAP( aStartAngle, >, aEndAngle );
const double alphaIncrement = calcAngleStep( aRadius );
Save();
m_currentManager->Translate( aCenterPoint.x, aCenterPoint.y, 0.0 );
if( m_isFillEnabled )
{
double alpha;
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
m_currentManager->Shader( SHADER_NONE );
// Triangle fan
for( alpha = aStartAngle; ( alpha + alphaIncrement ) < aEndAngle; )
{
m_currentManager->Reserve( 3 );
m_currentManager->Vertex( 0.0, 0.0, m_layerDepth );
m_currentManager->Vertex( cos( alpha ) * aRadius, sin( alpha ) * aRadius,
m_layerDepth );
alpha += alphaIncrement;
m_currentManager->Vertex( cos( alpha ) * aRadius, sin( alpha ) * aRadius,
m_layerDepth );
}
// The last missing triangle
const VECTOR2D endPoint( cos( aEndAngle ) * aRadius, sin( aEndAngle ) * aRadius );
m_currentManager->Reserve( 3 );
m_currentManager->Vertex( 0.0, 0.0, m_layerDepth );
m_currentManager->Vertex( cos( alpha ) * aRadius, sin( alpha ) * aRadius, m_layerDepth );
m_currentManager->Vertex( endPoint.x, endPoint.y, m_layerDepth );
}
if( m_isStrokeEnabled )
{
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b,
m_strokeColor.a );
VECTOR2D p( cos( aStartAngle ) * aRadius, sin( aStartAngle ) * aRadius );
double alpha;
for( alpha = aStartAngle + alphaIncrement; alpha <= aEndAngle; alpha += alphaIncrement )
{
VECTOR2D p_next( cos( alpha ) * aRadius, sin( alpha ) * aRadius );
DrawLine( p, p_next );
p = p_next;
}
// Draw the last missing part
if( alpha != aEndAngle )
{
VECTOR2D p_last( cos( aEndAngle ) * aRadius, sin( aEndAngle ) * aRadius );
DrawLine( p, p_last );
}
}
Restore();
}
void OPENGL_GAL::DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius,
double aStartAngle, double aEndAngle,
double aWidth, double aMaxError )
{
if( aRadius <= 0 )
{
// Arcs of zero radius are a circle of aWidth diameter
if( aWidth > 0 )
DrawCircle( aCenterPoint, aWidth / 2.0 );
return;
}
// Swap the angles, if start angle is greater than end angle
SWAP( aStartAngle, >, aEndAngle );
// Calculate the seg count to approximate the arc with aMaxError or less
int segCount360 = GetArcToSegmentCount( aRadius, aMaxError, 360.0 );
segCount360 = std::max( SEG_PER_CIRCLE_COUNT, segCount360 );
double alphaIncrement = 2.0 * M_PI / segCount360;
// Refinement: Use a segment count multiple of 2, because we have a control point
// on the middle of the arc, and the look is better if it is on a segment junction
// because there is no approx error
int seg_count = KiROUND( ( aEndAngle - aStartAngle ) / alphaIncrement );
if( seg_count % 2 != 0 )
seg_count += 1;
// Recalculate alphaIncrement with a even integer number of segment
if( seg_count )
alphaIncrement = ( aEndAngle - aStartAngle ) / seg_count;
Save();
m_currentManager->Translate( aCenterPoint.x, aCenterPoint.y, 0.0 );
if( m_isStrokeEnabled )
{
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b,
m_strokeColor.a );
double width = aWidth / 2.0;
VECTOR2D startPoint( cos( aStartAngle ) * aRadius, sin( aStartAngle ) * aRadius );
VECTOR2D endPoint( cos( aEndAngle ) * aRadius, sin( aEndAngle ) * aRadius );
drawStrokedSemiCircle( startPoint, width, aStartAngle + M_PI );
drawStrokedSemiCircle( endPoint, width, aEndAngle );
VECTOR2D pOuter( cos( aStartAngle ) * ( aRadius + width ),
sin( aStartAngle ) * ( aRadius + width ) );
VECTOR2D pInner( cos( aStartAngle ) * ( aRadius - width ),
sin( aStartAngle ) * ( aRadius - width ) );
double alpha;
for( alpha = aStartAngle + alphaIncrement; alpha <= aEndAngle; alpha += alphaIncrement )
{
VECTOR2D pNextOuter( cos( alpha ) * ( aRadius + width ),
sin( alpha ) * ( aRadius + width ) );
VECTOR2D pNextInner( cos( alpha ) * ( aRadius - width ),
sin( alpha ) * ( aRadius - width ) );
DrawLine( pOuter, pNextOuter );
DrawLine( pInner, pNextInner );
pOuter = pNextOuter;
pInner = pNextInner;
}
// Draw the last missing part
if( alpha != aEndAngle )
{
VECTOR2D pLastOuter( cos( aEndAngle ) * ( aRadius + width ),
sin( aEndAngle ) * ( aRadius + width ) );
VECTOR2D pLastInner( cos( aEndAngle ) * ( aRadius - width ),
sin( aEndAngle ) * ( aRadius - width ) );
DrawLine( pOuter, pLastOuter );
DrawLine( pInner, pLastInner );
}
}
if( m_isFillEnabled )
{
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
SetLineWidth( aWidth );
VECTOR2D p( cos( aStartAngle ) * aRadius, sin( aStartAngle ) * aRadius );
double alpha;
for( alpha = aStartAngle + alphaIncrement; alpha <= aEndAngle; alpha += alphaIncrement )
{
VECTOR2D p_next( cos( alpha ) * aRadius, sin( alpha ) * aRadius );
DrawLine( p, p_next );
p = p_next;
}
// Draw the last missing part
if( alpha != aEndAngle )
{
VECTOR2D p_last( cos( aEndAngle ) * aRadius, sin( aEndAngle ) * aRadius );
DrawLine( p, p_last );
}
}
Restore();
}
void OPENGL_GAL::DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
// Compute the diagonal points of the rectangle
VECTOR2D diagonalPointA( aEndPoint.x, aStartPoint.y );
VECTOR2D diagonalPointB( aStartPoint.x, aEndPoint.y );
// Fill the rectangle
if( m_isFillEnabled )
{
m_currentManager->Reserve( 6 );
m_currentManager->Shader( SHADER_NONE );
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
m_currentManager->Vertex( aStartPoint.x, aStartPoint.y, m_layerDepth );
m_currentManager->Vertex( diagonalPointA.x, diagonalPointA.y, m_layerDepth );
m_currentManager->Vertex( aEndPoint.x, aEndPoint.y, m_layerDepth );
m_currentManager->Vertex( aStartPoint.x, aStartPoint.y, m_layerDepth );
m_currentManager->Vertex( aEndPoint.x, aEndPoint.y, m_layerDepth );
m_currentManager->Vertex( diagonalPointB.x, diagonalPointB.y, m_layerDepth );
}
// Stroke the outline
if( m_isStrokeEnabled )
{
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b,
m_strokeColor.a );
std::deque<VECTOR2D> pointList;
pointList.push_back( aStartPoint );
pointList.push_back( diagonalPointA );
pointList.push_back( aEndPoint );
pointList.push_back( diagonalPointB );
pointList.push_back( aStartPoint );
DrawPolyline( pointList );
}
}
void OPENGL_GAL::DrawPolyline( const std::deque<VECTOR2D>& aPointList )
{
drawPolyline(
[&]( int idx )
{
return aPointList[idx];
},
aPointList.size() );
}
void OPENGL_GAL::DrawPolyline( const VECTOR2D aPointList[], int aListSize )
{
drawPolyline(
[&]( int idx )
{
return aPointList[idx];
},
aListSize );
}
void OPENGL_GAL::DrawPolyline( const SHAPE_LINE_CHAIN& aLineChain )
{
auto numPoints = aLineChain.PointCount();
if( aLineChain.IsClosed() )
numPoints += 1;
drawPolyline(
[&]( int idx )
{
return aLineChain.CPoint( idx );
},
numPoints );
}
void OPENGL_GAL::DrawPolygon( const std::deque<VECTOR2D>& aPointList )
{
wxCHECK( aPointList.size() >= 2, /* void */ );
auto points = std::unique_ptr<GLdouble[]>( new GLdouble[3 * aPointList.size()] );
GLdouble* ptr = points.get();
for( const VECTOR2D& p : aPointList )
{
*ptr++ = p.x;
*ptr++ = p.y;
*ptr++ = m_layerDepth;
}
drawPolygon( points.get(), aPointList.size() );
}
void OPENGL_GAL::DrawPolygon( const VECTOR2D aPointList[], int aListSize )
{
wxCHECK( aListSize >= 2, /* void */ );
auto points = std::unique_ptr<GLdouble[]>( new GLdouble[3 * aListSize] );
GLdouble* target = points.get();
const VECTOR2D* src = aPointList;
for( int i = 0; i < aListSize; ++i )
{
*target++ = src->x;
*target++ = src->y;
*target++ = m_layerDepth;
++src;
}
drawPolygon( points.get(), aListSize );
}
void OPENGL_GAL::drawTriangulatedPolyset( const SHAPE_POLY_SET& aPolySet,
bool aStrokeTriangulation )
{
m_currentManager->Shader( SHADER_NONE );
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
if( m_isFillEnabled )
{
for( unsigned int j = 0; j < aPolySet.TriangulatedPolyCount(); ++j )
{
auto triPoly = aPolySet.TriangulatedPolygon( j );
for( size_t i = 0; i < triPoly->GetTriangleCount(); i++ )
{
VECTOR2I a, b, c;
triPoly->GetTriangle( i, a, b, c );
m_currentManager->Vertex( a.x, a.y, m_layerDepth );
m_currentManager->Vertex( b.x, b.y, m_layerDepth );
m_currentManager->Vertex( c.x, c.y, m_layerDepth );
}
}
}
if( m_isStrokeEnabled )
{
for( int j = 0; j < aPolySet.OutlineCount(); ++j )
{
const auto& poly = aPolySet.Polygon( j );
for( const auto& lc : poly )
{
DrawPolyline( lc );
}
}
}
if( ADVANCED_CFG::GetCfg().m_DrawTriangulationOutlines )
{
aStrokeTriangulation = true;
SetStrokeColor( COLOR4D( 0.0, 1.0, 0.2, 1.0 ) );
}
if( aStrokeTriangulation )
{
COLOR4D oldStrokeColor = m_strokeColor;
double oldLayerDepth = m_layerDepth;
SetLayerDepth( m_layerDepth - 1 );
for( unsigned int j = 0; j < aPolySet.TriangulatedPolyCount(); ++j )
{
auto triPoly = aPolySet.TriangulatedPolygon( j );
for( size_t i = 0; i < triPoly->GetTriangleCount(); i++ )
{
VECTOR2I a, b, c;
triPoly->GetTriangle( i, a, b, c );
DrawLine( a, b );
DrawLine( b, c );
DrawLine( c, a );
}
}
SetStrokeColor( oldStrokeColor );
SetLayerDepth( oldLayerDepth );
}
}
void OPENGL_GAL::DrawPolygon( const SHAPE_POLY_SET& aPolySet, bool aStrokeTriangulation )
{
if( aPolySet.IsTriangulationUpToDate() )
{
drawTriangulatedPolyset( aPolySet, aStrokeTriangulation );
return;
}
for( int j = 0; j < aPolySet.OutlineCount(); ++j )
{
const SHAPE_LINE_CHAIN& outline = aPolySet.COutline( j );
DrawPolygon( outline );
}
}
void OPENGL_GAL::DrawPolygon( const SHAPE_LINE_CHAIN& aPolygon )
{
wxCHECK( aPolygon.PointCount() >= 2, /* void */ );
const int pointCount = aPolygon.SegmentCount() + 1;
std::unique_ptr<GLdouble[]> points( new GLdouble[3 * pointCount] );
GLdouble* ptr = points.get();
for( int i = 0; i < pointCount; ++i )
{
const VECTOR2I& p = aPolygon.CPoint( i );
*ptr++ = p.x;
*ptr++ = p.y;
*ptr++ = m_layerDepth;
}
drawPolygon( points.get(), pointCount );
}
void OPENGL_GAL::DrawCurve( const VECTOR2D& aStartPoint, const VECTOR2D& aControlPointA,
const VECTOR2D& aControlPointB, const VECTOR2D& aEndPoint,
double aFilterValue )
{
std::vector<VECTOR2D> output;
std::vector<VECTOR2D> pointCtrl;
pointCtrl.push_back( aStartPoint );
pointCtrl.push_back( aControlPointA );
pointCtrl.push_back( aControlPointB );
pointCtrl.push_back( aEndPoint );
BEZIER_POLY converter( pointCtrl );
converter.GetPoly( output, aFilterValue );
DrawPolyline( &output[0], output.size() );
}
void OPENGL_GAL::DrawBitmap( const BITMAP_BASE& aBitmap )
{
// We have to calculate the pixel size in users units to draw the image.
// m_worldUnitLength is a factor used for converting IU to inches
double scale = 1.0 / ( aBitmap.GetPPI() * m_worldUnitLength );
double w = (double) aBitmap.GetSizePixels().x * scale;
double h = (double) aBitmap.GetSizePixels().y * scale;
auto xform = m_currentManager->GetTransformation();
glm::vec4 v0 = xform * glm::vec4( -w / 2, -h / 2, 0.0, 0.0 );
glm::vec4 v1 = xform * glm::vec4( w / 2, h / 2, 0.0, 0.0 );
glm::vec4 trans = xform[3];
auto texture_id = m_bitmapCache->RequestBitmap( &aBitmap );
if( !glIsTexture( texture_id ) ) // ensure the bitmap texture is still valid
return;
auto oldTarget = GetTarget();
glPushMatrix();
glTranslated( trans.x, trans.y, trans.z );
SetTarget( TARGET_NONCACHED );
glEnable( GL_TEXTURE_2D );
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_2D, texture_id );
glBegin( GL_QUADS );
glColor4f( 1.0, 1.0, 1.0, 1.0 );
glTexCoord2f( 0.0, 0.0 );
glVertex3f( v0.x, v0.y, m_layerDepth );
glColor4f( 1.0, 1.0, 1.0, 1.0 );
glTexCoord2f( 1.0, 0.0 );
glVertex3f( v1.x, v0.y, m_layerDepth );
glColor4f( 1.0, 1.0, 1.0, 1.0 );
glTexCoord2f( 1.0, 1.0 );
glVertex3f( v1.x, v1.y, m_layerDepth );
glColor4f( 1.0, 1.0, 1.0, 1.0 );
glTexCoord2f( 0.0, 1.0 );
glVertex3f( v0.x, v1.y, m_layerDepth );
glEnd();
SetTarget( oldTarget );
glBindTexture( GL_TEXTURE_2D, 0 );
#ifdef DISABLE_BITMAP_CACHE
glDeleteTextures( 1, &texture_id );
#endif
glPopMatrix();
}
void OPENGL_GAL::BitmapText( const wxString& aText, const VECTOR2D& aPosition,
double aRotationAngle )
{
// Fallback to generic impl (which uses the stroke font) on cases we don't handle
if( IsTextMirrored() || aText.Contains( wxT( "^{" ) ) || aText.Contains( wxT( "_{" ) ) )
return GAL::BitmapText( aText, aPosition, aRotationAngle );
const UTF8 text( aText );
VECTOR2D textSize;
float commonOffset;
std::tie( textSize, commonOffset ) = computeBitmapTextSize( text );
const double SCALE = 1.4 * GetGlyphSize().y / textSize.y;
int overbarLength = 0;
double overbarHeight = textSize.y;
Save();
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b, m_strokeColor.a );
m_currentManager->Translate( aPosition.x, aPosition.y, m_layerDepth );
m_currentManager->Rotate( aRotationAngle, 0.0f, 0.0f, -1.0f );
double sx = SCALE * ( m_globalFlipX ? -1.0 : 1.0 );
double sy = SCALE * ( m_globalFlipY ? -1.0 : 1.0 );
m_currentManager->Scale( sx, sy, 0 );
m_currentManager->Translate( 0, -commonOffset, 0 );
switch( GetHorizontalJustify() )
{
case GR_TEXT_HJUSTIFY_CENTER:
Translate( VECTOR2D( -textSize.x / 2.0, 0 ) );
break;
case GR_TEXT_HJUSTIFY_RIGHT:
//if( !IsTextMirrored() )
Translate( VECTOR2D( -textSize.x, 0 ) );
break;
case GR_TEXT_HJUSTIFY_LEFT:
//if( IsTextMirrored() )
//Translate( VECTOR2D( -textSize.x, 0 ) );
break;
}
switch( GetVerticalJustify() )
{
case GR_TEXT_VJUSTIFY_TOP:
Translate( VECTOR2D( 0, -textSize.y ) );
overbarHeight = -textSize.y / 2.0;
break;
case GR_TEXT_VJUSTIFY_CENTER:
Translate( VECTOR2D( 0, -textSize.y / 2.0 ) );
overbarHeight = 0;
break;
case GR_TEXT_VJUSTIFY_BOTTOM:
break;
}
int overbarDepth = -1;
int braceNesting = 0;
for( UTF8::uni_iter chIt = text.ubegin(), end = text.uend(); chIt < end; ++chIt )
{
wxASSERT_MSG( *chIt != '\n' && *chIt != '\r',
wxT( "No support for multiline bitmap text yet" ) );
if( *chIt == '~' && overbarDepth == -1 )
{
UTF8::uni_iter lookahead = chIt;
if( ++lookahead != end && *lookahead == '{' )
{
chIt = lookahead;
overbarDepth = braceNesting;
braceNesting++;
continue;
}
}
else if( *chIt == '{' )
{
braceNesting++;
}
else if( *chIt == '}' )
{
if( braceNesting > 0 )
braceNesting--;
if( braceNesting == overbarDepth )
{
drawBitmapOverbar( overbarLength, overbarHeight );
overbarLength = 0;
overbarDepth = -1;
continue;
}
}
if( overbarDepth != -1 )
overbarLength += drawBitmapChar( *chIt );
else
drawBitmapChar( *chIt );
}
// Handle the case when overbar is active till the end of the drawn text
m_currentManager->Translate( 0, commonOffset, 0 );
if( overbarDepth != -1 && overbarLength > 0 )
drawBitmapOverbar( overbarLength, overbarHeight );
Restore();
}
void OPENGL_GAL::DrawGrid()
{
SetTarget( TARGET_NONCACHED );
m_compositor->SetBuffer( m_mainBuffer );
m_nonCachedManager->EnableDepthTest( false );
// sub-pixel lines all render the same
float minorLineWidth = std::fmax( 1.0f,
m_gridLineWidth ) * getWorldPixelSize() / GetScaleFactor();
float majorLineWidth = minorLineWidth * 2.0f;
// Draw the axis and grid
// For the drawing the start points, end points and increments have
// to be calculated in world coordinates
VECTOR2D worldStartPoint = m_screenWorldMatrix * VECTOR2D( 0.0, 0.0 );
VECTOR2D worldEndPoint = m_screenWorldMatrix * VECTOR2D( m_screenSize );
// Draw axes if desired
if( m_axesEnabled )
{
SetLineWidth( minorLineWidth );
SetStrokeColor( m_axesColor );
DrawLine( VECTOR2D( worldStartPoint.x, 0 ), VECTOR2D( worldEndPoint.x, 0 ) );
DrawLine( VECTOR2D( 0, worldStartPoint.y ), VECTOR2D( 0, worldEndPoint.y ) );
}
// force flush
m_nonCachedManager->EndDrawing();
if( !m_gridVisibility || m_gridSize.x == 0 || m_gridSize.y == 0 )
return;
VECTOR2D gridScreenSize( m_gridSize );
double gridThreshold = computeMinGridSpacing() / m_worldScale;
if( m_gridStyle == GRID_STYLE::SMALL_CROSS )
gridThreshold *= 2.0;
// If we cannot display the grid density, scale down by a tick size and
// try again. Eventually, we get some representation of the grid
while( std::min( gridScreenSize.x, gridScreenSize.y ) <= gridThreshold )
{
gridScreenSize = gridScreenSize * static_cast<double>( m_gridTick );
}
// Compute grid starting and ending indexes to draw grid points on the
// visible screen area
// Note: later any point coordinate will be offsetted by m_gridOrigin
int gridStartX = KiROUND( ( worldStartPoint.x - m_gridOrigin.x ) / gridScreenSize.x );
int gridEndX = KiROUND( ( worldEndPoint.x - m_gridOrigin.x ) / gridScreenSize.x );
int gridStartY = KiROUND( ( worldStartPoint.y - m_gridOrigin.y ) / gridScreenSize.y );
int gridEndY = KiROUND( ( worldEndPoint.y - m_gridOrigin.y ) / gridScreenSize.y );
// Ensure start coordinate > end coordinate
SWAP( gridStartX, >, gridEndX );
SWAP( gridStartY, >, gridEndY );
// Ensure the grid fills the screen
--gridStartX;
++gridEndX;
--gridStartY;
++gridEndY;
glDisable( GL_DEPTH_TEST );
glDisable( GL_TEXTURE_2D );
if( m_gridStyle == GRID_STYLE::DOTS )
{
glEnable( GL_STENCIL_TEST );
glStencilFunc( GL_ALWAYS, 1, 1 );
glStencilOp( GL_KEEP, GL_KEEP, GL_INCR );
glColor4d( 0.0, 0.0, 0.0, 0.0 );
SetStrokeColor( COLOR4D( 0.0, 0.0, 0.0, 0.0 ) );
}
else
{
glColor4d( m_gridColor.r, m_gridColor.g, m_gridColor.b, m_gridColor.a );
SetStrokeColor( m_gridColor );
}
if( m_gridStyle == GRID_STYLE::SMALL_CROSS )
{
// Vertical positions
for( int j = gridStartY; j <= gridEndY; j++ )
{
bool tickY = ( j % m_gridTick == 0 );
const double posY = j * gridScreenSize.y + m_gridOrigin.y;
// Horizontal positions
for( int i = gridStartX; i <= gridEndX; i++ )
{
bool tickX = ( i % m_gridTick == 0 );
SetLineWidth( ( ( tickX && tickY ) ? majorLineWidth : minorLineWidth ) );
auto lineLen = 2.0 * GetLineWidth();
auto posX = i * gridScreenSize.x + m_gridOrigin.x;
DrawLine( VECTOR2D( posX - lineLen, posY ), VECTOR2D( posX + lineLen, posY ) );
DrawLine( VECTOR2D( posX, posY - lineLen ), VECTOR2D( posX, posY + lineLen ) );
}
}
m_nonCachedManager->EndDrawing();
}
else
{
// Vertical lines
for( int j = gridStartY; j <= gridEndY; j++ )
{
const double y = j * gridScreenSize.y + m_gridOrigin.y;
// If axes are drawn, skip the lines that would cover them
if( m_axesEnabled && y == 0.0 )
continue;
SetLineWidth( ( j % m_gridTick == 0 ) ? majorLineWidth : minorLineWidth );
VECTOR2D a( gridStartX * gridScreenSize.x + m_gridOrigin.x, y );
VECTOR2D b( gridEndX * gridScreenSize.x + m_gridOrigin.x, y );
DrawLine( a, b );
}
m_nonCachedManager->EndDrawing();
if( m_gridStyle == GRID_STYLE::DOTS )
{
glStencilFunc( GL_NOTEQUAL, 0, 1 );
glColor4d( m_gridColor.r, m_gridColor.g, m_gridColor.b, m_gridColor.a );
SetStrokeColor( m_gridColor );
}
// Horizontal lines
for( int i = gridStartX; i <= gridEndX; i++ )
{
const double x = i * gridScreenSize.x + m_gridOrigin.x;
// If axes are drawn, skip the lines that would cover them
if( m_axesEnabled && x == 0.0 )
continue;
SetLineWidth( ( i % m_gridTick == 0 ) ? majorLineWidth : minorLineWidth );
VECTOR2D a( x, gridStartY * gridScreenSize.y + m_gridOrigin.y );
VECTOR2D b( x, gridEndY * gridScreenSize.y + m_gridOrigin.y );
DrawLine( a, b );
}
m_nonCachedManager->EndDrawing();
if( m_gridStyle == GRID_STYLE::DOTS )
glDisable( GL_STENCIL_TEST );
}
glEnable( GL_DEPTH_TEST );
glEnable( GL_TEXTURE_2D );
}
void OPENGL_GAL::ResizeScreen( int aWidth, int aHeight )
{
m_screenSize = VECTOR2I( aWidth, aHeight );
// Resize framebuffers
const float scaleFactor = GetScaleFactor();
m_compositor->Resize( aWidth * scaleFactor, aHeight * scaleFactor );
m_isFramebufferInitialized = false;
wxGLCanvas::SetSize( aWidth, aHeight );
}
bool OPENGL_GAL::Show( bool aShow )
{
bool s = wxGLCanvas::Show( aShow );
if( aShow )
wxGLCanvas::Raise();
return s;
}
void OPENGL_GAL::Flush()
{
glFlush();
}
void OPENGL_GAL::ClearScreen()
{
// Clear screen
m_compositor->SetBuffer( OPENGL_COMPOSITOR::DIRECT_RENDERING );
// NOTE: Black used here instead of m_clearColor; it will be composited later
glClearColor( 0, 0, 0, 1 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
}
void OPENGL_GAL::Transform( const MATRIX3x3D& aTransformation )
{
GLdouble matrixData[16] = { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 };
matrixData[0] = aTransformation.m_data[0][0];
matrixData[1] = aTransformation.m_data[1][0];
matrixData[2] = aTransformation.m_data[2][0];
matrixData[4] = aTransformation.m_data[0][1];
matrixData[5] = aTransformation.m_data[1][1];
matrixData[6] = aTransformation.m_data[2][1];
matrixData[12] = aTransformation.m_data[0][2];
matrixData[13] = aTransformation.m_data[1][2];
matrixData[14] = aTransformation.m_data[2][2];
glMultMatrixd( matrixData );
}
void OPENGL_GAL::Rotate( double aAngle )
{
m_currentManager->Rotate( aAngle, 0.0f, 0.0f, 1.0f );
}
void OPENGL_GAL::Translate( const VECTOR2D& aVector )
{
m_currentManager->Translate( aVector.x, aVector.y, 0.0f );
}
void OPENGL_GAL::Scale( const VECTOR2D& aScale )
{
m_currentManager->Scale( aScale.x, aScale.y, 0.0f );
}
void OPENGL_GAL::Save()
{
m_currentManager->PushMatrix();
}
void OPENGL_GAL::Restore()
{
m_currentManager->PopMatrix();
}
int OPENGL_GAL::BeginGroup()
{
m_isGrouping = true;
std::shared_ptr<VERTEX_ITEM> newItem = std::make_shared<VERTEX_ITEM>( *m_cachedManager );
int groupNumber = getNewGroupNumber();
m_groups.insert( std::make_pair( groupNumber, newItem ) );
return groupNumber;
}
void OPENGL_GAL::EndGroup()
{
m_cachedManager->FinishItem();
m_isGrouping = false;
}
void OPENGL_GAL::DrawGroup( int aGroupNumber )
{
auto group = m_groups.find( aGroupNumber );
if( group != m_groups.end() )
m_cachedManager->DrawItem( *group->second );
}
void OPENGL_GAL::ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor )
{
auto group = m_groups.find( aGroupNumber );
if( group != m_groups.end() )
m_cachedManager->ChangeItemColor( *group->second, aNewColor );
}
void OPENGL_GAL::ChangeGroupDepth( int aGroupNumber, int aDepth )
{
auto group = m_groups.find( aGroupNumber );
if( group != m_groups.end() )
m_cachedManager->ChangeItemDepth( *group->second, aDepth );
}
void OPENGL_GAL::DeleteGroup( int aGroupNumber )
{
// Frees memory in the container as well
m_groups.erase( aGroupNumber );
}
void OPENGL_GAL::ClearCache()
{
m_bitmapCache = std::make_unique<GL_BITMAP_CACHE>();
m_groups.clear();
if( m_isInitialized )
m_cachedManager->Clear();
}
void OPENGL_GAL::SetTarget( RENDER_TARGET aTarget )
{
switch( aTarget )
{
default:
case TARGET_CACHED: m_currentManager = m_cachedManager; break;
case TARGET_NONCACHED: m_currentManager = m_nonCachedManager; break;
case TARGET_OVERLAY: m_currentManager = m_overlayManager; break;
case TARGET_TEMP: m_currentManager = m_tempManager; break;
}
m_currentTarget = aTarget;
}
RENDER_TARGET OPENGL_GAL::GetTarget() const
{
return m_currentTarget;
}
void OPENGL_GAL::ClearTarget( RENDER_TARGET aTarget )
{
// Save the current state
unsigned int oldTarget = m_compositor->GetBuffer();
switch( aTarget )
{
// Cached and noncached items are rendered to the same buffer
default:
case TARGET_CACHED:
case TARGET_NONCACHED:
m_compositor->SetBuffer( m_mainBuffer );
break;
case TARGET_TEMP:
m_compositor->SetBuffer( m_tempBuffer );
break;
case TARGET_OVERLAY:
if( m_overlayBuffer )
m_compositor->SetBuffer( m_overlayBuffer );
break;
}
if( aTarget != TARGET_OVERLAY )
m_compositor->ClearBuffer( m_clearColor );
else if( m_overlayBuffer )
m_compositor->ClearBuffer( COLOR4D::BLACK );
// Restore the previous state
m_compositor->SetBuffer( oldTarget );
}
bool OPENGL_GAL::HasTarget( RENDER_TARGET aTarget )
{
switch( aTarget )
{
default:
case TARGET_TEMP:
case TARGET_CACHED:
case TARGET_NONCACHED: return true;
case TARGET_OVERLAY: return ( m_overlayBuffer != 0 );
}
}
void OPENGL_GAL::StartDiffLayer()
{
m_currentManager->EndDrawing();
SetTarget( TARGET_TEMP );
ClearTarget( TARGET_TEMP );
}
void OPENGL_GAL::EndDiffLayer()
{
glBlendEquation( GL_MAX );
m_currentManager->EndDrawing();
glBlendEquation( GL_FUNC_ADD );
m_compositor->DrawBuffer( m_tempBuffer, m_mainBuffer );
}
bool OPENGL_GAL::SetNativeCursorStyle( KICURSOR aCursor )
{
// Store the current cursor type and get the wxCursor for it
if( !GAL::SetNativeCursorStyle( aCursor ) )
return false;
m_currentwxCursor = CURSOR_STORE::GetCursor( m_currentNativeCursor );
// Update the cursor in the wx control
HIDPI_GL_CANVAS::SetCursor( m_currentwxCursor );
return true;
}
void OPENGL_GAL::onSetNativeCursor( wxSetCursorEvent& aEvent )
{
aEvent.SetCursor( m_currentwxCursor );
}
void OPENGL_GAL::DrawCursor( const VECTOR2D& aCursorPosition )
{
// Now we should only store the position of the mouse cursor
// The real drawing routines are in blitCursor()
//VECTOR2D screenCursor = m_worldScreenMatrix * aCursorPosition;
//m_cursorPosition = m_screenWorldMatrix * VECTOR2D( screenCursor.x, screenCursor.y );
m_cursorPosition = aCursorPosition;
}
void OPENGL_GAL::drawLineQuad( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
/* Helper drawing: ____--- v3 ^
* ____---- ... \ \
* ____---- ... \ end \
* v1 ____---- ... ____---- \ width
* ---- ...___---- \ \
* \ ___...-- \ v
* \ ____----... ____---- v2
* ---- ... ____----
* start \ ... ____----
* \... ____----
* ----
* v0
* dots mark triangles' hypotenuses
*/
auto v1 = m_currentManager->GetTransformation()
* glm::vec4( aStartPoint.x, aStartPoint.y, 0.0, 0.0 );
auto v2 = m_currentManager->GetTransformation()
* glm::vec4( aEndPoint.x, aEndPoint.y, 0.0, 0.0 );
VECTOR2D vs( v2.x - v1.x, v2.y - v1.y );
m_currentManager->Reserve( 6 );
// Line width is maintained by the vertex shader
m_currentManager->Shader( SHADER_LINE_A, m_lineWidth, vs.x, vs.y );
m_currentManager->Vertex( aStartPoint, m_layerDepth );
m_currentManager->Shader( SHADER_LINE_B, m_lineWidth, vs.x, vs.y );
m_currentManager->Vertex( aStartPoint, m_layerDepth );
m_currentManager->Shader( SHADER_LINE_C, m_lineWidth, vs.x, vs.y );
m_currentManager->Vertex( aEndPoint, m_layerDepth );
m_currentManager->Shader( SHADER_LINE_D, m_lineWidth, vs.x, vs.y );
m_currentManager->Vertex( aEndPoint, m_layerDepth );
m_currentManager->Shader( SHADER_LINE_E, m_lineWidth, vs.x, vs.y );
m_currentManager->Vertex( aEndPoint, m_layerDepth );
m_currentManager->Shader( SHADER_LINE_F, m_lineWidth, vs.x, vs.y );
m_currentManager->Vertex( aStartPoint, m_layerDepth );
}
void OPENGL_GAL::drawSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle )
{
if( m_isFillEnabled )
{
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
drawFilledSemiCircle( aCenterPoint, aRadius, aAngle );
}
if( m_isStrokeEnabled )
{
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b,
m_strokeColor.a );
drawStrokedSemiCircle( aCenterPoint, aRadius, aAngle );
}
}
void OPENGL_GAL::drawFilledSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle )
{
Save();
m_currentManager->Reserve( 3 );
m_currentManager->Translate( aCenterPoint.x, aCenterPoint.y, 0.0f );
m_currentManager->Rotate( aAngle, 0.0f, 0.0f, 1.0f );
/* Draw a triangle that contains the semicircle, then shade it to leave only
* the semicircle. Parameters given to Shader() are indices of the triangle's vertices
* (if you want to understand more, check the vertex shader source [shader.vert]).
* Shader uses these coordinates to determine if fragments are inside the semicircle or not.
* v2
* /\
* /__\
* v0 //__\\ v1
*/
m_currentManager->Shader( SHADER_FILLED_CIRCLE, 4.0f );
m_currentManager->Vertex( -aRadius * 3.0f / sqrt( 3.0f ), 0.0f, m_layerDepth ); // v0
m_currentManager->Shader( SHADER_FILLED_CIRCLE, 5.0f );
m_currentManager->Vertex( aRadius * 3.0f / sqrt( 3.0f ), 0.0f, m_layerDepth ); // v1
m_currentManager->Shader( SHADER_FILLED_CIRCLE, 6.0f );
m_currentManager->Vertex( 0.0f, aRadius * 2.0f, m_layerDepth ); // v2
Restore();
}
void OPENGL_GAL::drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRadius,
double aAngle )
{
double outerRadius = aRadius + ( m_lineWidth / 2 );
Save();
m_currentManager->Reserve( 3 );
m_currentManager->Translate( aCenterPoint.x, aCenterPoint.y, 0.0f );
m_currentManager->Rotate( aAngle, 0.0f, 0.0f, 1.0f );
/* Draw a triangle that contains the semicircle, then shade it to leave only
* the semicircle. Parameters given to Shader() are indices of the triangle's vertices
* (if you want to understand more, check the vertex shader source [shader.vert]), the
* radius and the line width. Shader uses these coordinates to determine if fragments are
* inside the semicircle or not.
* v2
* /\
* /__\
* v0 //__\\ v1
*/
m_currentManager->Shader( SHADER_STROKED_CIRCLE, 4.0f, aRadius, m_lineWidth );
m_currentManager->Vertex( -outerRadius * 3.0f / sqrt( 3.0f ), 0.0f, m_layerDepth ); // v0
m_currentManager->Shader( SHADER_STROKED_CIRCLE, 5.0f, aRadius, m_lineWidth );
m_currentManager->Vertex( outerRadius * 3.0f / sqrt( 3.0f ), 0.0f, m_layerDepth ); // v1
m_currentManager->Shader( SHADER_STROKED_CIRCLE, 6.0f, aRadius, m_lineWidth );
m_currentManager->Vertex( 0.0f, outerRadius * 2.0f, m_layerDepth ); // v2
Restore();
}
void OPENGL_GAL::drawPolygon( GLdouble* aPoints, int aPointCount )
{
if( m_isFillEnabled )
{
m_currentManager->Shader( SHADER_NONE );
m_currentManager->Color( m_fillColor.r, m_fillColor.g, m_fillColor.b, m_fillColor.a );
// Any non convex polygon needs to be tesselated
// for this purpose the GLU standard functions are used
TessParams params = { m_currentManager, m_tessIntersects };
gluTessBeginPolygon( m_tesselator, &params );
gluTessBeginContour( m_tesselator );
GLdouble* point = aPoints;
for( int i = 0; i < aPointCount; ++i )
{
gluTessVertex( m_tesselator, point, point );
point += 3; // 3 coordinates
}
gluTessEndContour( m_tesselator );
gluTessEndPolygon( m_tesselator );
// Free allocated intersecting points
m_tessIntersects.clear();
}
if( m_isStrokeEnabled )
{
drawPolyline(
[&]( int idx )
{
return VECTOR2D( aPoints[idx * 3], aPoints[idx * 3 + 1] );
},
aPointCount );
}
}
void OPENGL_GAL::drawPolyline( const std::function<VECTOR2D( int )>& aPointGetter, int aPointCount )
{
wxCHECK( aPointCount >= 2, /* return */ );
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b, m_strokeColor.a );
int i;
for( i = 1; i < aPointCount; ++i )
{
auto start = aPointGetter( i - 1 );
auto end = aPointGetter( i );
drawLineQuad( start, end );
}
}
int OPENGL_GAL::drawBitmapChar( unsigned long aChar )
{
const float TEX_X = font_image.width;
const float TEX_Y = font_image.height;
// handle space
if( aChar == ' ' )
{
const FONT_GLYPH_TYPE* g = LookupGlyph( 'x' );
wxASSERT( g );
if( !g ) // Should not happen.
return 0;
Translate( VECTOR2D( g->advance, 0 ) );
return g->advance;
}
const FONT_GLYPH_TYPE* glyph = LookupGlyph( aChar );
// If the glyph is not found (happens for many esoteric unicode chars)
// shows a '?' instead.
if( !glyph )
glyph = LookupGlyph( '?' );
if( !glyph ) // Should not happen.
return 0;
const float X = glyph->atlas_x + font_information.smooth_pixels;
const float Y = glyph->atlas_y + font_information.smooth_pixels;
const float XOFF = glyph->minx;
// adjust for height rounding
const float round_adjust = ( glyph->maxy - glyph->miny )
- float( glyph->atlas_h - font_information.smooth_pixels * 2 );
const float top_adjust = font_information.max_y - glyph->maxy;
const float YOFF = round_adjust + top_adjust;
const float W = glyph->atlas_w - font_information.smooth_pixels * 2;
const float H = glyph->atlas_h - font_information.smooth_pixels * 2;
const float B = 0;
m_currentManager->Reserve( 6 );
Translate( VECTOR2D( XOFF, YOFF ) );
/* Glyph:
* v0 v1
* +--+
* | /|
* |/ |
* +--+
* v2 v3
*/
m_currentManager->Shader( SHADER_FONT, X / TEX_X, ( Y + H ) / TEX_Y );
m_currentManager->Vertex( -B, -B, 0 ); // v0
m_currentManager->Shader( SHADER_FONT, ( X + W ) / TEX_X, ( Y + H ) / TEX_Y );
m_currentManager->Vertex( W + B, -B, 0 ); // v1
m_currentManager->Shader( SHADER_FONT, X / TEX_X, Y / TEX_Y );
m_currentManager->Vertex( -B, H + B, 0 ); // v2
m_currentManager->Shader( SHADER_FONT, ( X + W ) / TEX_X, ( Y + H ) / TEX_Y );
m_currentManager->Vertex( W + B, -B, 0 ); // v1
m_currentManager->Shader( SHADER_FONT, X / TEX_X, Y / TEX_Y );
m_currentManager->Vertex( -B, H + B, 0 ); // v2
m_currentManager->Shader( SHADER_FONT, ( X + W ) / TEX_X, Y / TEX_Y );
m_currentManager->Vertex( W + B, H + B, 0 ); // v3
Translate( VECTOR2D( -XOFF + glyph->advance, -YOFF ) );
return glyph->advance;
}
void OPENGL_GAL::drawBitmapOverbar( double aLength, double aHeight )
{
// To draw an overbar, simply draw an overbar
const FONT_GLYPH_TYPE* glyph = LookupGlyph( '_' );
wxCHECK( glyph, /* void */ );
const float H = glyph->maxy - glyph->miny;
Save();
Translate( VECTOR2D( -aLength, -aHeight ) );
m_currentManager->Reserve( 6 );
m_currentManager->Color( m_strokeColor.r, m_strokeColor.g, m_strokeColor.b, m_strokeColor.a );
m_currentManager->Shader( 0 );
m_currentManager->Vertex( 0, 0, 0 ); // v0
m_currentManager->Vertex( aLength, 0, 0 ); // v1
m_currentManager->Vertex( 0, H, 0 ); // v2
m_currentManager->Vertex( aLength, 0, 0 ); // v1
m_currentManager->Vertex( 0, H, 0 ); // v2
m_currentManager->Vertex( aLength, H, 0 ); // v3
Restore();
}
std::pair<VECTOR2D, float> OPENGL_GAL::computeBitmapTextSize( const UTF8& aText ) const
{
static const FONT_GLYPH_TYPE* defaultGlyph = LookupGlyph( '(' ); // for strange chars
VECTOR2D textSize( 0, 0 );
float commonOffset = std::numeric_limits<float>::max();
float charHeight = font_information.max_y - defaultGlyph->miny;
int overbarDepth = -1;
int braceNesting = 0;
for( UTF8::uni_iter chIt = aText.ubegin(), end = aText.uend(); chIt < end; ++chIt )
{
if( *chIt == '~' && overbarDepth == -1 )
{
UTF8::uni_iter lookahead = chIt;
if( ++lookahead != end && *lookahead == '{' )
{
chIt = lookahead;
overbarDepth = braceNesting;
braceNesting++;
continue;
}
}
else if( *chIt == '{' )
{
braceNesting++;
}
else if( *chIt == '}' )
{
if( braceNesting > 0 )
braceNesting--;
if( braceNesting == overbarDepth )
{
overbarDepth = -1;
continue;
}
}
const FONT_GLYPH_TYPE* glyph = LookupGlyph( *chIt );
if( !glyph // Not coded in font
|| *chIt == '-' || *chIt == '_' ) // Strange size of these 2 chars
{
glyph = defaultGlyph;
}
if( glyph )
textSize.x += glyph->advance;
}
textSize.y = std::max<float>( textSize.y, charHeight );
commonOffset = std::min<float>( font_information.max_y - defaultGlyph->maxy, commonOffset );
textSize.y -= commonOffset;
return std::make_pair( textSize, commonOffset );
}
void OPENGL_GAL::onPaint( wxPaintEvent& aEvent )
{
PostPaint( aEvent );
}
void OPENGL_GAL::skipMouseEvent( wxMouseEvent& aEvent )
{
// Post the mouse event to the event listener registered in constructor, if any
if( m_mouseListener )
wxPostEvent( m_mouseListener, aEvent );
}
void OPENGL_GAL::blitCursor()
{
if( !IsCursorEnabled() )
return;
m_compositor->SetBuffer( OPENGL_COMPOSITOR::DIRECT_RENDERING );
const int cursorSize = m_fullscreenCursor ? 8000 : 80;
VECTOR2D cursorBegin = m_cursorPosition - cursorSize / ( 2 * m_worldScale );
VECTOR2D cursorEnd = m_cursorPosition + cursorSize / ( 2 * m_worldScale );
VECTOR2D cursorCenter = ( cursorBegin + cursorEnd ) / 2;
const COLOR4D cColor = getCursorColor();
const COLOR4D color( cColor.r * cColor.a, cColor.g * cColor.a, cColor.b * cColor.a, 1.0 );
glActiveTexture( GL_TEXTURE0 );
glDisable( GL_TEXTURE_2D );
glLineWidth( 1.0 );
glColor4d( color.r, color.g, color.b, color.a );
glBegin( GL_LINES );
glVertex2d( cursorCenter.x, cursorBegin.y );
glVertex2d( cursorCenter.x, cursorEnd.y );
glVertex2d( cursorBegin.x, cursorCenter.y );
glVertex2d( cursorEnd.x, cursorCenter.y );
glEnd();
}
unsigned int OPENGL_GAL::getNewGroupNumber()
{
wxASSERT_MSG( m_groups.size() < std::numeric_limits<unsigned int>::max(),
wxT( "There are no free slots to store a group" ) );
while( m_groups.find( m_groupCounter ) != m_groups.end() )
m_groupCounter++;
return m_groupCounter++;
}
void OPENGL_GAL::init()
{
wxASSERT( IsShownOnScreen() );
wxASSERT_MSG( m_isContextLocked, wxT( "This should only be called from within a locked context." ) );
// IsDisplayAttr() handles WX_GL_{MAJOR,MINOR}_VERSION correctly only in 3.0.4
// starting with 3.1.0 one should use wxGLContext::IsOk() (done by GL_CONTEXT_MANAGER)
#if wxCHECK_VERSION( 3, 0, 3 ) and !wxCHECK_VERSION( 3, 1, 0 )
const int attr[] = { WX_GL_MAJOR_VERSION, 2, WX_GL_MINOR_VERSION, 1, 0 };
if( !IsDisplaySupported( attr ) )
throw std::runtime_error( "OpenGL 2.1 or higher is required!" );
#endif /* wxCHECK_VERSION( 3, 0, 3 ) */
// Check correct initialization from the constructor
if( !m_glMainContext )
throw std::runtime_error( "Could not create the main OpenGL context" );
if( !m_glPrivContext )
throw std::runtime_error( "Could not create a private OpenGL context" );
if( m_tesselator == nullptr )
throw std::runtime_error( "Could not create the m_tesselator" );
// End initialization checks
GLenum err = glewInit();
if( GLEW_OK != err )
throw std::runtime_error( (const char*) glewGetErrorString( err ) );
// Check the OpenGL version (minimum 2.1 is required)
if( !GLEW_VERSION_2_1 )
throw std::runtime_error( "OpenGL 2.1 or higher is required!" );
#if defined( __LINUX__ ) // calling enableGlDebug crashes opengl on some OS (OSX and some Windows)
#ifdef DEBUG
if( GLEW_ARB_debug_output )
enableGlDebug( true );
#endif
#endif
// Framebuffers have to be supported
if( !GLEW_EXT_framebuffer_object )
throw std::runtime_error( "Framebuffer objects are not supported!" );
// Vertex buffer has to be supported
if( !GLEW_ARB_vertex_buffer_object )
throw std::runtime_error( "Vertex buffer objects are not supported!" );
// Prepare shaders
if( !m_shader->IsLinked()
&& !m_shader->LoadShaderFromStrings( SHADER_TYPE_VERTEX,
BUILTIN_SHADERS::kicad_vertex_shader ) )
{
throw std::runtime_error( "Cannot compile vertex shader!" );
}
if( !m_shader->IsLinked()
&& !m_shader->LoadShaderFromStrings( SHADER_TYPE_FRAGMENT,
BUILTIN_SHADERS::kicad_fragment_shader ) )
{
throw std::runtime_error( "Cannot compile fragment shader!" );
}
if( !m_shader->IsLinked() && !m_shader->Link() )
throw std::runtime_error( "Cannot link the shaders!" );
// Check if video card supports textures big enough to fit the font atlas
int maxTextureSize;
glGetIntegerv( GL_MAX_TEXTURE_SIZE, &maxTextureSize );
if( maxTextureSize < (int) font_image.width || maxTextureSize < (int) font_image.height )
{
// TODO implement software texture scaling
// for bitmap fonts and use a higher resolution texture?
throw std::runtime_error( "Requested texture size is not supported" );
}
GL_UTILS::SetSwapInterval( -1 );
m_cachedManager = new VERTEX_MANAGER( true );
m_nonCachedManager = new VERTEX_MANAGER( false );
m_overlayManager = new VERTEX_MANAGER( false );
m_tempManager = new VERTEX_MANAGER( false );
// Make VBOs use shaders
m_cachedManager->SetShader( *m_shader );
m_nonCachedManager->SetShader( *m_shader );
m_overlayManager->SetShader( *m_shader );
m_tempManager->SetShader( *m_shader );
m_isInitialized = true;
}
// Callback functions for the tesselator. Compare Redbook Chapter 11.
void CALLBACK VertexCallback( GLvoid* aVertexPtr, void* aData )
{
GLdouble* vertex = static_cast<GLdouble*>( aVertexPtr );
OPENGL_GAL::TessParams* param = static_cast<OPENGL_GAL::TessParams*>( aData );
VERTEX_MANAGER* vboManager = param->vboManager;
assert( vboManager );
vboManager->Vertex( vertex[0], vertex[1], vertex[2] );
}
void CALLBACK CombineCallback( GLdouble coords[3], GLdouble* vertex_data[4], GLfloat weight[4],
GLdouble** dataOut, void* aData )
{
GLdouble* vertex = new GLdouble[3];
OPENGL_GAL::TessParams* param = static_cast<OPENGL_GAL::TessParams*>( aData );
// Save the pointer so we can delete it later
param->intersectPoints.emplace_back( vertex );
memcpy( vertex, coords, 3 * sizeof( GLdouble ) );
*dataOut = vertex;
}
void CALLBACK EdgeCallback( GLboolean aEdgeFlag )
{
// This callback is needed to force GLU tesselator to use triangles only
}
void CALLBACK ErrorCallback( GLenum aErrorCode )
{
//throw std::runtime_error( std::string( "Tessellation error: " ) +
//std::string( (const char*) gluErrorString( aErrorCode ) );
}
static void InitTesselatorCallbacks( GLUtesselator* aTesselator )
{
gluTessCallback( aTesselator, GLU_TESS_VERTEX_DATA, (void( CALLBACK* )()) VertexCallback );
gluTessCallback( aTesselator, GLU_TESS_COMBINE_DATA, (void( CALLBACK* )()) CombineCallback );
gluTessCallback( aTesselator, GLU_TESS_EDGE_FLAG, (void( CALLBACK* )()) EdgeCallback );
gluTessCallback( aTesselator, GLU_TESS_ERROR, (void( CALLBACK* )()) ErrorCallback );
}
void OPENGL_GAL::EnableDepthTest( bool aEnabled )
{
m_cachedManager->EnableDepthTest( aEnabled );
m_nonCachedManager->EnableDepthTest( aEnabled );
m_overlayManager->EnableDepthTest( aEnabled );
}
inline double round_to_half_pixel( double f, double r )
{
return ( ceil( f / r ) - 0.5 ) * r;
}
void OPENGL_GAL::ComputeWorldScreenMatrix()
{
computeWorldScale();
auto pixelSize = m_worldScale;
// we need -m_lookAtPoint == -k * pixelSize + 0.5 * pixelSize for OpenGL
// meaning m_lookAtPoint = (k-0.5)*pixelSize with integer k
m_lookAtPoint.x = round_to_half_pixel( m_lookAtPoint.x, pixelSize );
m_lookAtPoint.y = round_to_half_pixel( m_lookAtPoint.y, pixelSize );
GAL::ComputeWorldScreenMatrix();
}
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