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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 Kicad Developers, see change_log.txt for contributors.
* Copyright (C) 2013 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
*/
#include <gal/opengl/opengl_gal.h>
#include <gal/definitions.h>
#include <wx/log.h>
#include <macros.h>
#ifdef __WXDEBUG__
#include <profile.h>
#endif /* __WXDEBUG__ */
#include <limits>
#include <boost/foreach.hpp>
#ifndef CALLBACK
#define CALLBACK
#endif
using namespace KiGfx;
// Prototypes
void InitTesselatorCallbacks( GLUtesselator* aTesselator );
const int glAttributes[] = { WX_GL_RGBA, WX_GL_DOUBLEBUFFER, WX_GL_DEPTH_SIZE, 16, 0 };
OPENGL_GAL::OPENGL_GAL( wxWindow* aParent, wxEvtHandler* aMouseListener,
wxEvtHandler* aPaintListener, const wxString& aName ) :
wxGLCanvas( aParent, wxID_ANY, (int*) glAttributes, wxDefaultPosition, wxDefaultSize,
wxEXPAND, aName ),
cachedManager( true ),
nonCachedManager( false ),
overlayManager( false )
{
// Create the OpenGL-Context
glContext = new wxGLContext( this );
parentWindow = aParent;
mouseListener = aMouseListener;
paintListener = aPaintListener;
// Set the cursor size
initCursor( 20 );
SetCursorColor( COLOR4D( 1.0, 1.0, 1.0, 1.0 ) );
// Initialize the flags
isGlewInitialized = false;
isFramebufferInitialized = false;
isShaderInitialized = false;
isGrouping = false;
wxSize parentSize = aParent->GetSize();
groupCounter = 0;
SetSize( parentSize );
screenSize.x = parentSize.x;
screenSize.y = parentSize.y;
// Set grid defaults
SetGridColor( COLOR4D( 0.3, 0.3, 0.3, 0.3 ) );
SetCoarseGrid( 10 );
SetGridLineWidth( 1.0 );
// 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_MOUSEWHEEL, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DOWN, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_UP, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DOWN, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_UP, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DOWN, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_UP, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
#if defined _WIN32 || defined _WIN64
Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler( OPENGL_GAL::skipMouseEvent ) );
#endif
// Tesselator initialization
tesselator = gluNewTess();
InitTesselatorCallbacks( tesselator );
gluTessProperty( tesselator, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_POSITIVE );
// Compute the unit circle vertices and store them in a buffer for faster drawing
computeCircle();
}
OPENGL_GAL::~OPENGL_GAL()
{
glFlush();
gluDeleteTess( tesselator );
ClearCache();
delete glContext;
}
void OPENGL_GAL::onPaint( wxPaintEvent& aEvent )
{
PostPaint();
}
void OPENGL_GAL::ResizeScreen( int aWidth, int aHeight )
{
screenSize = VECTOR2D( aWidth, aHeight );
// Resize framebuffers
compositor.Resize( aWidth, aHeight );
isFramebufferInitialized = false;
wxGLCanvas::SetSize( aWidth, aHeight );
}
void OPENGL_GAL::skipMouseEvent( wxMouseEvent& aEvent )
{
// Post the mouse event to the event listener registered in constructor, if any
if( mouseListener )
wxPostEvent( mouseListener, aEvent );
}
void OPENGL_GAL::SaveScreen()
{
wxASSERT_MSG( false, wxT( "Not implemented yet" ) );
}
void OPENGL_GAL::RestoreScreen()
{
wxASSERT_MSG( false, wxT( "Not implemented yet" ) );
}
void OPENGL_GAL::SetTarget( RenderTarget aTarget )
{
switch( aTarget )
{
default:
case TARGET_CACHED:
currentManager = &cachedManager;
break;
case TARGET_NONCACHED:
currentManager = &nonCachedManager;
break;
case TARGET_OVERLAY:
currentManager = &overlayManager;
break;
}
}
void OPENGL_GAL::initGlew()
{
// Initialize GLEW library
GLenum err = glewInit();
if( GLEW_OK != err )
{
wxLogError( wxString::FromUTF8( (char*) glewGetErrorString( err ) ) );
exit( 1 );
}
else
{
wxLogDebug( wxString( wxT( "Status: Using GLEW " ) ) +
FROM_UTF8( (char*) glewGetString( GLEW_VERSION ) ) );
}
// Check the OpenGL version (minimum 2.1 is required)
if( GLEW_VERSION_2_1 )
{
wxLogInfo( wxT( "OpenGL Version 2.1 supported." ) );
}
else
{
wxLogError( wxT( "OpenGL Version 2.1 is not supported!" ) );
exit( 1 );
}
// Framebuffers have to be supported
if( !GLEW_ARB_framebuffer_object )
{
wxLogError( wxT( "Framebuffer objects are not supported!" ) );
exit( 1 );
}
// Vertex buffer have to be supported
if( !GLEW_ARB_vertex_buffer_object )
{
wxLogError( wxT( "Vertex buffer objects are not supported!" ) );
exit( 1 );
}
isGlewInitialized = true;
}
void OPENGL_GAL::BeginDrawing()
{
SetCurrent( *glContext );
clientDC = new wxClientDC( this );
// Initialize GLEW, FBOs & VBOs
if( !isGlewInitialized )
initGlew();
if( !isFramebufferInitialized )
{
// Set up the view port
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glViewport( 0, 0, (GLsizei) screenSize.x, (GLsizei) screenSize.y );
// Create the screen transformation
glOrtho( 0, (GLint) screenSize.x, 0, (GLsizei) screenSize.y, -depthRange.x, -depthRange.y );
// Prepare rendering target buffers
compositor.Initialize();
mainBuffer = compositor.GetBuffer();
overlayBuffer = compositor.GetBuffer();
isFramebufferInitialized = true;
}
// Compile the shaders
if( !isShaderInitialized )
{
if( !shader.LoadBuiltinShader( 0, SHADER_TYPE_VERTEX ) )
wxLogFatalError( wxT( "Cannot compile vertex shader!" ) );
if( !shader.LoadBuiltinShader( 1, SHADER_TYPE_FRAGMENT ) )
wxLogFatalError( wxT( "Cannot compile fragment shader!" ) );
if( !shader.Link() )
wxLogFatalError( wxT( "Cannot link the shaders!" ) );
// Make VBOs use shaders
cachedManager.SetShader( shader );
nonCachedManager.SetShader( shader );
overlayManager.SetShader( shader );
isShaderInitialized = true;
}
// Disable 2D Textures
glDisable( GL_TEXTURE_2D );
// 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 );
// Enable smooth lines
glEnable( GL_LINE_SMOOTH );
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] = worldScreenMatrix.m_data[0][0];
matrixData[1] = worldScreenMatrix.m_data[1][0];
matrixData[2] = worldScreenMatrix.m_data[2][0];
matrixData[4] = worldScreenMatrix.m_data[0][1];
matrixData[5] = worldScreenMatrix.m_data[1][1];
matrixData[6] = worldScreenMatrix.m_data[2][1];
matrixData[12] = worldScreenMatrix.m_data[0][2];
matrixData[13] = worldScreenMatrix.m_data[1][2];
matrixData[14] = worldScreenMatrix.m_data[2][2];
glLoadMatrixd( matrixData );
// Set defaults
SetFillColor( fillColor );
SetStrokeColor( strokeColor );
// Prepare buffers for drawing
nonCachedManager.Clear();
overlayManager.Clear();
cachedManager.BeginDrawing();
nonCachedManager.BeginDrawing();
overlayManager.BeginDrawing();
}
void OPENGL_GAL::EndDrawing()
{
// Cached & non-cached containers are rendered to the same buffer
compositor.SetBuffer( mainBuffer );
compositor.ClearBuffer();
nonCachedManager.EndDrawing();
cachedManager.EndDrawing();
// Overlay container is rendered to a different buffer
compositor.SetBuffer( overlayBuffer );
compositor.ClearBuffer();
overlayManager.EndDrawing();
// Draw the remaining contents, blit the rendering targets to the screen, swap the buffers
glFlush();
compositor.DrawBuffer( mainBuffer );
compositor.DrawBuffer( overlayBuffer );
SwapBuffers();
delete clientDC;
}
inline void OPENGL_GAL::drawLineQuad( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
VECTOR2D startEndVector = aEndPoint - aStartPoint;
double lineLength = startEndVector.EuclideanNorm();
double scale = 0.5 * lineWidth / lineLength;
if( lineLength <= 0.0 )
return;
VECTOR2D perpendicularVector( -startEndVector.y * scale, startEndVector.x * scale );
glm::vec4 vector( perpendicularVector.x, perpendicularVector.y, 0.0, 0.0 );
// The perpendicular vector also needs transformations
vector = currentManager->GetTransformation() * vector;
// Line width is maintained by the vertex shader
currentManager->Shader( SHADER_LINE, vector.x, vector.y, lineWidth );
currentManager->Vertex( aStartPoint.x, aStartPoint.y, layerDepth ); // v0
currentManager->Shader( SHADER_LINE, -vector.x, -vector.y, lineWidth );
currentManager->Vertex( aStartPoint.x, aStartPoint.y, layerDepth ); // v1
currentManager->Shader( SHADER_LINE, -vector.x, -vector.y, lineWidth );
currentManager->Vertex( aEndPoint.x, aEndPoint.y, layerDepth ); // v3
currentManager->Shader( SHADER_LINE, vector.x, vector.y, lineWidth );
currentManager->Vertex( aStartPoint.x, aStartPoint.y, layerDepth ); // v0
currentManager->Shader( SHADER_LINE, -vector.x, -vector.y, lineWidth );
currentManager->Vertex( aEndPoint.x, aEndPoint.y, layerDepth ); // v3
currentManager->Shader( SHADER_LINE, vector.x, vector.y, lineWidth );
currentManager->Vertex( aEndPoint.x, aEndPoint.y, layerDepth ); // v2
}
void OPENGL_GAL::DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
double aWidth )
{
VECTOR2D startEndVector = aEndPoint - aStartPoint;
double lineAngle = startEndVector.Angle();
if( isFillEnabled )
{
// Filled tracks
currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
SetLineWidth( aWidth );
drawLineQuad( aStartPoint, aEndPoint );
// Draw line caps
drawFilledSemiCircle( aStartPoint, aWidth / 2, lineAngle + M_PI / 2 );
drawFilledSemiCircle( aEndPoint, aWidth / 2, lineAngle - M_PI / 2 );
}
else
{
// Outlined tracks
double lineLength = startEndVector.EuclideanNorm();
currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
Save();
currentManager->Translate( aStartPoint.x, aStartPoint.y, 0.0 );
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 + lineWidth ) / 2, M_PI / 2 );
drawStrokedSemiCircle( VECTOR2D( lineLength, 0.0 ),
( aWidth + lineWidth ) / 2, -M_PI / 2 );
Restore();
}
}
unsigned int OPENGL_GAL::getNewGroupNumber()
{
wxASSERT_MSG( groups.size() < std::numeric_limits<unsigned int>::max(),
wxT( "There are no free slots to store a group" ) );
while( groups.find( groupCounter ) != groups.end() )
{
groupCounter++;
}
return groupCounter++;
}
void OPENGL_GAL::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
const VECTOR2D startEndVector = aEndPoint - aStartPoint;
double lineAngle = startEndVector.Angle();
drawLineQuad( aStartPoint, aEndPoint );
// Line caps
drawFilledSemiCircle( aStartPoint, lineWidth / 2, lineAngle + M_PI / 2 );
drawFilledSemiCircle( aEndPoint, lineWidth / 2, lineAngle - M_PI / 2 );
}
void OPENGL_GAL::DrawPolyline( std::deque<VECTOR2D>& aPointList )
{
std::deque<VECTOR2D>::const_iterator it = aPointList.begin();
// Start from the second point
for( it++; it != aPointList.end(); it++ )
{
const VECTOR2D startEndVector = ( *it - *( it - 1 ) );
double lineAngle = startEndVector.Angle();
drawLineQuad( *( it - 1 ), *it );
// There is no need to draw line caps on both ends of polyline's segments
drawFilledSemiCircle( *( it - 1 ), lineWidth / 2, lineAngle + M_PI / 2 );
}
// ..and now - draw the ending cap
const VECTOR2D startEndVector = ( *( it - 1 ) - *( it - 2 ) );
double lineAngle = startEndVector.Angle();
drawFilledSemiCircle( *( it - 1 ), lineWidth / 2, lineAngle - M_PI / 2 );
}
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 );
// Stroke the outline
if( isStrokeEnabled )
{
currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, 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 );
}
// Fill the rectangle
if( isFillEnabled )
{
currentManager->Shader( SHADER_NONE );
currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
currentManager->Vertex( aStartPoint.x, aStartPoint.y, layerDepth );
currentManager->Vertex( diagonalPointA.x, diagonalPointA.y, layerDepth );
currentManager->Vertex( aEndPoint.x, aEndPoint.y, layerDepth );
currentManager->Vertex( aStartPoint.x, aStartPoint.y, layerDepth );
currentManager->Vertex( aEndPoint.x, aEndPoint.y, layerDepth );
currentManager->Vertex( diagonalPointB.x, diagonalPointB.y, layerDepth );
}
}
void OPENGL_GAL::DrawCircle( const VECTOR2D& aCenterPoint, double aRadius )
{
if( isFillEnabled )
{
currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
/* Draw a triangle that contains the circle, then shade it leaving only the circle.
Parameters given to setShader 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.
v2
/\
//\\
v0 /_\/_\ v1
*/
currentManager->Shader( SHADER_FILLED_CIRCLE, 1.0 );
currentManager->Vertex( aCenterPoint.x - aRadius * sqrt( 3.0f ), // v0
aCenterPoint.y - aRadius, layerDepth );
currentManager->Shader( SHADER_FILLED_CIRCLE, 2.0 );
currentManager->Vertex( aCenterPoint.x + aRadius* sqrt( 3.0f ), // v1
aCenterPoint.y - aRadius, layerDepth );
currentManager->Shader( SHADER_FILLED_CIRCLE, 3.0 );
currentManager->Vertex( aCenterPoint.x, aCenterPoint.y + aRadius * 2.0f, // v2
layerDepth );
}
if( isStrokeEnabled )
{
currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
/* Draw a triangle that contains the circle, then shade it leaving only the circle.
Parameters given to setShader 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
*/
double outerRadius = aRadius + ( lineWidth / 2 );
currentManager->Shader( SHADER_STROKED_CIRCLE, 1.0, aRadius, lineWidth );
currentManager->Vertex( aCenterPoint.x - outerRadius * sqrt( 3.0f ), // v0
aCenterPoint.y - outerRadius, layerDepth );
currentManager->Shader( SHADER_STROKED_CIRCLE, 2.0, aRadius, lineWidth );
currentManager->Vertex( aCenterPoint.x + outerRadius * sqrt( 3.0f ), // v1
aCenterPoint.y - outerRadius, layerDepth );
currentManager->Shader( SHADER_STROKED_CIRCLE, 3.0, aRadius, lineWidth );
currentManager->Vertex( aCenterPoint.x, aCenterPoint.y + outerRadius * 2.0f, // v2
layerDepth );
}
}
void OPENGL_GAL::drawSemiCircle( const VECTOR2D& aCenterPoint, double aRadius, double aAngle )
{
if( isFillEnabled )
{
currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
drawFilledSemiCircle( aCenterPoint, aRadius, aAngle );
}
if( isStrokeEnabled )
{
currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
drawStrokedSemiCircle( aCenterPoint, aRadius, aAngle );
}
}
void OPENGL_GAL::drawFilledSemiCircle( const VECTOR2D& aCenterPoint, double aRadius,
double aAngle )
{
Save();
currentManager->Translate( aCenterPoint.x, aCenterPoint.y, 0.0f );
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 setShader 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 semicircle or not.
v2
/\
/__\
v0 //__\\ v1
*/
currentManager->Shader( SHADER_FILLED_CIRCLE, 4.0f );
currentManager->Vertex( -aRadius * 3.0f / sqrt( 3.0f ), 0.0f, layerDepth ); // v0
currentManager->Shader( SHADER_FILLED_CIRCLE, 5.0f );
currentManager->Vertex( aRadius * 3.0f / sqrt( 3.0f ), 0.0f, layerDepth ); // v1
currentManager->Shader( SHADER_FILLED_CIRCLE, 6.0f );
currentManager->Vertex( 0.0f, aRadius * 2.0f, layerDepth ); // v2
Restore();
}
void OPENGL_GAL::drawStrokedSemiCircle( const VECTOR2D& aCenterPoint, double aRadius,
double aAngle )
{
double outerRadius = aRadius + ( lineWidth / 2 );
Save();
currentManager->Translate( aCenterPoint.x, aCenterPoint.y, 0.0f );
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 setShader 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 this coordinates to determine if fragments are
inside the semicircle or not.
v2
/\
/__\
v0 //__\\ v1
*/
currentManager->Shader( SHADER_STROKED_CIRCLE, 4.0f, aRadius, lineWidth );
currentManager->Vertex( -outerRadius * 3.0f / sqrt( 3.0f ), 0.0f, layerDepth ); // v0
currentManager->Shader( SHADER_STROKED_CIRCLE, 5.0f, aRadius, lineWidth );
currentManager->Vertex( outerRadius * 3.0f / sqrt( 3.0f ), 0.0f, layerDepth ); // v1
currentManager->Shader( SHADER_STROKED_CIRCLE, 6.0f, aRadius, lineWidth );
currentManager->Vertex( 0.0f, outerRadius * 2.0f, layerDepth ); // v2
Restore();
}
// FIXME Optimize
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 );
VECTOR2D startPoint( cos( aStartAngle ), sin( aStartAngle ) );
VECTOR2D endPoint( cos( aEndAngle ), sin( aEndAngle ) );
VECTOR2D startEndPoint = startPoint + endPoint;
VECTOR2D middlePoint = 0.5 * startEndPoint;
Save();
currentManager->Translate( aCenterPoint.x, aCenterPoint.y, layerDepth );
if( isStrokeEnabled )
{
double alphaIncrement = 2.0 * M_PI / CIRCLE_POINTS;
currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, 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 );
}
}
if( isFillEnabled )
{
double alphaIncrement = 2 * M_PI / CIRCLE_POINTS;
double alpha;
currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
for( alpha = aStartAngle; ( alpha + alphaIncrement ) < aEndAngle; )
{
currentManager->Vertex( middlePoint.x, middlePoint.y, 0.0 );
currentManager->Vertex( cos( alpha ), sin( alpha ), 0.0 );
alpha += alphaIncrement;
currentManager->Vertex( cos( alpha ), sin( alpha ), 0.0 );
}
currentManager->Vertex( middlePoint.x, middlePoint.y, 0.0 );
currentManager->Vertex( cos( alpha ), sin( alpha ), 0.0 );
currentManager->Vertex( endPoint.x, endPoint.y, 0.0 );
}
Restore();
}
struct OGLPOINT
{
OGLPOINT() :
x( 0.0 ), y( 0.0 ), z( 0.0 )
{}
OGLPOINT( const char* fastest )
{
// do nothing for fastest speed, and keep inline
}
OGLPOINT( const VECTOR2D& aPoint ) :
x( aPoint.x ), y( aPoint.y ), z( 0.0 )
{}
OGLPOINT& operator=( const VECTOR2D& aPoint )
{
x = aPoint.x;
y = aPoint.y;
z = 0.0;
return *this;
}
GLdouble x;
GLdouble y;
GLdouble z;
};
void OPENGL_GAL::DrawPolygon( const std::deque<VECTOR2D>& aPointList )
{
// Any non convex polygon needs to be tesselated
// for this purpose the GLU standard functions are used
currentManager->Shader( SHADER_NONE );
typedef std::vector<OGLPOINT> OGLPOINTS;
// Do only one heap allocation, can do because we know size in advance.
// std::vector is then fastest
OGLPOINTS vertexList( aPointList.size(), OGLPOINT( "fastest" ) );
glNormal3d( 0.0, 0.0, 1.0 );
currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );
glShadeModel( GL_FLAT );
TessParams params = { currentManager, tessIntersects };
gluTessBeginPolygon( tesselator, &params );
gluTessBeginContour( tesselator );
// use operator=( const POINTS& )
copy( aPointList.begin(), aPointList.end(), vertexList.begin() );
for( OGLPOINTS::iterator it = vertexList.begin(); it != vertexList.end(); it++ )
{
it->z = layerDepth;
gluTessVertex( tesselator, &it->x, &it->x );
}
gluTessEndContour( tesselator );
gluTessEndPolygon( tesselator );
// Free allocated intersecting points
std::vector<GLdouble*>::iterator it, it_end;
for( it = tessIntersects.begin(), it_end = tessIntersects.end(); it < it_end; ++it )
{
delete[] *it;
}
tessIntersects.clear();
// vertexList destroyed here
}
void OPENGL_GAL::DrawCurve( const VECTOR2D& aStartPoint, const VECTOR2D& aControlPointA,
const VECTOR2D& aControlPointB, const VECTOR2D& aEndPoint )
{
// FIXME The drawing quality needs to be improved
// FIXME Perhaps choose a quad/triangle strip instead?
// FIXME Brute force method, use a better (recursive?) algorithm
std::deque<VECTOR2D> pointList;
double t = 0.0;
double dt = 1.0 / (double) CURVE_POINTS;
for( int i = 0; i <= CURVE_POINTS; i++ )
{
double omt = 1.0 - t;
double omt2 = omt * omt;
double omt3 = omt * omt2;
double t2 = t * t;
double t3 = t * t2;
VECTOR2D vertex = omt3 * aStartPoint + 3.0 * t * omt2 * aControlPointA
+ 3.0 * t2 * omt * aControlPointB + t3 * aEndPoint;
pointList.push_back( vertex );
t += dt;
}
DrawPolyline( pointList );
}
void OPENGL_GAL::SetStrokeColor( const COLOR4D& aColor )
{
isSetAttributes = true;
strokeColor = aColor;
// This is the default drawing color
currentManager->Color( aColor.r, aColor.g, aColor.b, aColor.a );
}
void OPENGL_GAL::SetFillColor( const COLOR4D& aColor )
{
isSetAttributes = true;
fillColor = aColor;
}
void OPENGL_GAL::SetBackgroundColor( const COLOR4D& aColor )
{
isSetAttributes = true;
backgroundColor = aColor;
}
void OPENGL_GAL::SetLineWidth( double aLineWidth )
{
isSetAttributes = true;
lineWidth = aLineWidth;
}
void OPENGL_GAL::ClearScreen()
{
// Clear screen
glClearColor( backgroundColor.r, backgroundColor.g, backgroundColor.b, backgroundColor.a );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
}
void OPENGL_GAL::Transform( 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 )
{
currentManager->Rotate( aAngle, 0.0f, 0.0f, 1.0f );
}
void OPENGL_GAL::Translate( const VECTOR2D& aVector )
{
currentManager->Translate( aVector.x, aVector.y, 0.0f );
}
void OPENGL_GAL::Scale( const VECTOR2D& aScale )
{
currentManager->Scale( aScale.x, aScale.y, 0.0f );
}
void OPENGL_GAL::Flush()
{
glFlush();
}
void OPENGL_GAL::Save()
{
currentManager->PushMatrix();
}
void OPENGL_GAL::Restore()
{
currentManager->PopMatrix();
}
int OPENGL_GAL::BeginGroup()
{
isGrouping = true;
boost::shared_ptr<VERTEX_ITEM> newItem( new VERTEX_ITEM( cachedManager ) );
int groupNumber = getNewGroupNumber();
groups.insert( std::make_pair( groupNumber, newItem ) );
return groupNumber;
}
void OPENGL_GAL::EndGroup()
{
isGrouping = false;
}
void OPENGL_GAL::ClearCache()
{
groups.clear();
cachedManager.Clear();
}
void OPENGL_GAL::DeleteGroup( int aGroupNumber )
{
groups.erase( aGroupNumber );
}
void OPENGL_GAL::DrawGroup( int aGroupNumber )
{
cachedManager.DrawItem( *groups[aGroupNumber] );
}
void OPENGL_GAL::ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor )
{
cachedManager.ChangeItemColor( *groups[aGroupNumber], aNewColor );
}
void OPENGL_GAL::ChangeGroupDepth( int aGroupNumber, int aDepth )
{
cachedManager.ChangeItemDepth( *groups[aGroupNumber], aDepth );
}
void OPENGL_GAL::computeCircle()
{
VERTEX* vertex = circleContainer.Allocate( CIRCLE_POINTS );
// Compute the circle points for a given number of segments
for( int i = 0; i < CIRCLE_POINTS; ++i )
{
vertex->x = 0.0f;
vertex->y = 0.0f;
vertex->z = 0.0f;
vertex++;
vertex->x = cos( 2.0 * M_PI / CIRCLE_POINTS * i );
vertex->y = sin( 2.0 * M_PI / CIRCLE_POINTS * i );
vertex->z = 0.0f;
vertex++;
vertex->x = cos( 2.0 * M_PI / CIRCLE_POINTS * ( i + 1 ) );
vertex->y = sin( 2.0 * M_PI / CIRCLE_POINTS * ( i + 1 ) );
vertex->z = 0.0f;
vertex++;
}
}
void OPENGL_GAL::ComputeWorldScreenMatrix()
{
ComputeWorldScale();
worldScreenMatrix.SetIdentity();
MATRIX3x3D translation;
translation.SetIdentity();
translation.SetTranslation( 0.5 * screenSize );
MATRIX3x3D scale;
scale.SetIdentity();
scale.SetScale( VECTOR2D( worldScale, worldScale ) );
MATRIX3x3D flip;
flip.SetIdentity();
flip.SetScale( VECTOR2D( 1.0, 1.0 ) );
MATRIX3x3D lookat;
lookat.SetIdentity();
lookat.SetTranslation( -lookAtPoint );
worldScreenMatrix = translation * flip * scale * lookat * worldScreenMatrix;
}
// -------------------------------------
// 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;
if( 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.push_back( vertex );
memcpy( vertex, coords, 3 * sizeof(GLdouble) );
*dataOut = vertex;
}
void CALLBACK EdgeCallback(void)
{
// This callback is needed to force GLU tesselator to use triangles only
}
void CALLBACK ErrorCallback( GLenum aErrorCode )
{
const GLubyte* estring;
estring = gluErrorString( aErrorCode );
wxLogError( wxT( "Tessellation Error: %s" ), (char*) estring );
}
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_DATA, ( void (CALLBACK*)() )ErrorCallback );
}
// ---------------
// Cursor handling
// ---------------
void OPENGL_GAL::initCursor( int aCursorSize )
{
cursorSize = aCursorSize;
}
VECTOR2D OPENGL_GAL::ComputeCursorToWorld( const VECTOR2D& aCursorPosition )
{
VECTOR2D cursorPosition = aCursorPosition;
cursorPosition.y = screenSize.y - aCursorPosition.y;
MATRIX3x3D inverseMatrix = worldScreenMatrix.Inverse();
VECTOR2D cursorPositionWorld = inverseMatrix * cursorPosition;
return cursorPositionWorld;
}
void OPENGL_GAL::DrawCursor( VECTOR2D aCursorPosition )
{
wxLogWarning( wxT( "Not tested ") );
SetCurrent( *glContext );
// Draw the cursor on the surface
VECTOR2D cursorPositionWorld = ComputeCursorToWorld( aCursorPosition );
cursorPositionWorld.x = round( cursorPositionWorld.x / gridSize.x ) * gridSize.x;
cursorPositionWorld.y = round( cursorPositionWorld.y / gridSize.y ) * gridSize.y;
aCursorPosition = worldScreenMatrix * cursorPositionWorld;
// Switch to the main framebuffer and blit the scene
//glBindFramebuffer( GL_FRAMEBUFFER, 0 );
//glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glLoadIdentity();
glDisable( GL_TEXTURE_2D );
glColor4d( cursorColor.r, cursorColor.g, cursorColor.b, cursorColor.a );
glBegin( GL_TRIANGLES );
glVertex3f( (int) ( aCursorPosition.x - cursorSize / 2 ) + 1,
(int) ( aCursorPosition.y ), depthRange.x );
glVertex3f( (int) ( aCursorPosition.x + cursorSize / 2 ) + 1,
(int) ( aCursorPosition.y ), depthRange.x );
glVertex3f( (int) ( aCursorPosition.x + cursorSize / 2 ) + 1,
(int) ( aCursorPosition.y + 1 ), depthRange.x );
glVertex3f( (int) ( aCursorPosition.x - cursorSize / 2 ) + 1,
(int) ( aCursorPosition.y ), depthRange.x );
glVertex3f( (int) ( aCursorPosition.x - cursorSize / 2 ) + 1,
(int) ( aCursorPosition.y + 1), depthRange.x );
glVertex3f( (int) ( aCursorPosition.x + cursorSize / 2 ) + 1,
(int) ( aCursorPosition.y + 1 ), depthRange.x );
glVertex3f( (int) ( aCursorPosition.x ),
(int) ( aCursorPosition.y - cursorSize / 2 ) + 1, depthRange.x );
glVertex3f( (int) ( aCursorPosition.x ),
(int) ( aCursorPosition.y + cursorSize / 2 ) + 1, depthRange.x );
glVertex3f( (int) ( aCursorPosition.x ) + 1,
(int) ( aCursorPosition.y + cursorSize / 2 ) + 1, depthRange.x );
glVertex3f( (int) ( aCursorPosition.x ),
(int) ( aCursorPosition.y - cursorSize / 2 ) + 1, depthRange.x );
glVertex3f( (int) ( aCursorPosition.x ) + 1,
(int) ( aCursorPosition.y - cursorSize / 2 ) + 1, depthRange.x );
glVertex3f( (int) ( aCursorPosition.x ) + 1,
(int) ( aCursorPosition.y + cursorSize / 2 ) + 1, depthRange.x );
glEnd();
// Blit the current screen contents
SwapBuffers();
}
void OPENGL_GAL::DrawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
// TODO change to simple drawline
// We check, if we got a horizontal or a vertical grid line and compute the offset
VECTOR2D perpendicularVector;
if( aStartPoint.x == aEndPoint.x )
{
// Vertical grid line
perpendicularVector = VECTOR2D( 0.5 * lineWidth, 0 );
}
else
{
// Horizontal grid line
perpendicularVector = VECTOR2D( 0, 0.5 * lineWidth );
}
// Now we compute the edge points of the quad
VECTOR2D point1 = aStartPoint + perpendicularVector;
VECTOR2D point2 = aStartPoint - perpendicularVector;
VECTOR2D point3 = aEndPoint + perpendicularVector;
VECTOR2D point4 = aEndPoint - perpendicularVector;
currentManager->Color( gridColor.r, gridColor.g, gridColor.b, gridColor.a );
currentManager->Shader( SHADER_NONE );
// Draw the quad for the grid line
double gridDepth = depthRange.y * 0.75;
currentManager->Vertex( point1.x, point1.y, gridDepth );
currentManager->Vertex( point2.x, point2.y, gridDepth );
currentManager->Vertex( point4.x, point4.y, gridDepth );
currentManager->Vertex( point1.x, point1.y, gridDepth );
currentManager->Vertex( point4.x, point4.y, gridDepth );
currentManager->Vertex( point3.x, point3.y, gridDepth );
}
bool OPENGL_GAL::Show( bool aShow )
{
bool s = wxGLCanvas::Show( aShow );
if( aShow )
wxGLCanvas::Raise();
return s;
}
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