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#ifdef WIN32
#include <windows.h>
#endif
#ifdef __APPLE__
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif
#include "mgl2/opengl.h"
#include "mgl2/mgl_cf.h"
#include <algorithm>
//-----------------------------------------------------------------------------
/// Create mglGraph object in OpenGL mode.
HMGL MGL_EXPORT mgl_create_graph_gl()
{ return new mglCanvasGL; }
/// Create mglGraph object in OpenGL mode.
uintptr_t MGL_EXPORT mgl_create_graph_gl_()
{ return uintptr_t(new mglCanvasGL); }
//-----------------------------------------------------------------------------
mglCanvasGL::mglCanvasGL() : mglCanvas(1,1)
{ Clf(); Zoom(0,0,1,1); set(MGL_FULL_CURV); }
//-----------------------------------------------------------------------------
mglCanvasGL::~mglCanvasGL(){}
//-----------------------------------------------------------------------------
void set_pen(unsigned style, mreal width, mreal pos)
{
if(style==0) return;
unsigned long pdef = style*0x100010001;
pdef >>= long(32*pos)%32; // NOTE try to bypass OpenGL limitations
style = pdef & 0xffff;
width *= 20;
if(style!=0xffff)
{
glEnable(GL_LINE_STIPPLE);
glLineStipple(int(width+0.5),style);
}
else glDisable(GL_LINE_STIPPLE);
if(width>1) glLineWidth(width); // NOTE bypass bug on some drivers, where width>1 must be
else glLineWidth(1);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::Finish()
{
#if MGL_USE_DOUBLE
#define MGL_GL_TYPE GL_DOUBLE
#else
#define MGL_GL_TYPE GL_FLOAT
#endif
// Try to add smoothing
glEnable(GL_LINE_SMOOTH);
glEnable(GL_POLYGON_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
glEnable(GL_BLEND);
if((Flag&3)==1) glBlendFunc(GL_DST_COLOR, GL_ZERO);
else if((Flag&3)==2) glBlendFunc(GL_SRC_ALPHA, GL_ONE);
else glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if(Prm.size()>0)
{
PreparePrim(0);
/* glVertexPointer(3, MGL_GL_TYPE, sizeof(mglPnt), &(Pnt[0].x)); // something wrong with arrays
glNormalPointer(MGL_GL_TYPE, sizeof(mglPnt), &(Pnt[0].u));
glColorPointer(4, MGL_GL_TYPE, sizeof(mglPnt), &(Pnt[0].r));
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);*/
int pdef=PDef;
mreal ss=pPos, ww=PenWidth;
mglPrim p;
for(size_t i=0;i<Prm.size();i++)
{
p=GetPrm(i); PDef=p.n3; pPos=p.s; PenWidth=p.w;
long n1=p.n1, n2=p.n2, n3=p.n3, n4=p.n4;
mglDrawReg d; d.set(this,1,1,0);
switch(p.type)
{
/* case 0: mark_draw(Pnt[n1],n4,p.s,0); break;
case 1: line_draw(n1,n2); break;
case 2: trig_draw(n1,n2,n3); break;
case 3: quad_draw(n1,n2,n3,n4); break;*/
case 0: mark_draw(Pnt[n1],n4,p.s,&d); break;
case 1: line_draw(Pnt[n1],Pnt[n2],&d); break;
case 2: trig_draw(Pnt[n1],Pnt[n2],Pnt[n3],true,&d); break;
case 3: quad_draw(Pnt[n1],Pnt[n2],Pnt[n3],Pnt[n4],&d); break;
case 4: glyph_draw(p,&d); break;
}
}
PDef=pdef; pPos=ss; PenWidth=ww;
}
glFinish();
}
//-----------------------------------------------------------------------------
bool mglCanvasGL::Alpha(bool enable)
{
if(enable)
{
set(MGL_ENABLE_ALPHA);
glDisable(GL_DEPTH_TEST);
glEnable(GL_ALPHA_TEST);
glEnable(GL_BLEND);
if((Flag&3)==1) glBlendFunc(GL_DST_COLOR, GL_ZERO);
else if((Flag&3)==2) glBlendFunc(GL_SRC_ALPHA, GL_ONE);
else glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
else
{
clr(MGL_ENABLE_ALPHA);
glEnable(GL_DEPTH_TEST);
glDisable(GL_ALPHA_TEST);
// glDisable(GL_BLEND);
}
return mglCanvas::Alpha(enable);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::AddLight(int n,mglPoint r,mglPoint d,char cc, mreal br,mreal ap)
{
mglColor c(cc);
float amb[4],dif[4],spc[4], pos[4];
bool inf = mgl_isnan(r.x);
if(n<0 || n>7) { SetWarn(mglWarnLId,"AddLight"); return; }
if(c.Valid())
{
spc[0] = br*c.r; spc[1] = br*c.g; spc[2] = br*c.b;
amb[0] = AmbBr*c.r; amb[1] = AmbBr*c.g; amb[2] = AmbBr*c.b;
}
else
{
spc[0] = spc[1] = spc[2] = br;
amb[0] = amb[1] = amb[2] = AmbBr;
}
ap = 90-180*atan(fabs(ap))/M_PI;
dif[0] = dif[1] = dif[2] = DifBr;
dif[3] = amb[3] = spc[3] = 1.;
if(inf)
{ pos[0] = d.x; pos[1] = d.y; pos[2] = d.z; pos[3] = 0; }
else
{ pos[0] = r.x; pos[1] = r.y; pos[2] = r.z; pos[3] = 1; }
glShadeModel(GL_SMOOTH);
glLightfv(GL_LIGHT0+n, GL_AMBIENT, amb);
glLightfv(GL_LIGHT0+n, GL_DIFFUSE, dif);
glLightfv(GL_LIGHT0+n, GL_SPECULAR, spc);
glLightfv(GL_LIGHT0+n, GL_POSITION, pos);
if(!inf)
{
// float dir[4]={d.x, d.y, d.z, 0};
// glLightfv(GL_LIGHT0+n, GL_SPOT_DIRECTION, dir);
// glLightf(GL_LIGHT0+n, GL_SPOT_CUTOFF, ap);
}
glEnable(GL_LIGHT0+n);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::Light(int n, bool enable)
{
if(enable) glEnable(GL_LIGHT0+n);
else glDisable(GL_LIGHT0+n);
}
//-----------------------------------------------------------------------------
bool mglCanvasGL::Light(bool enable)
{
if(enable) { glEnable(GL_LIGHTING); glEnable(GL_NORMALIZE);}
else { glDisable(GL_LIGHTING); glDisable(GL_NORMALIZE); }
return mglCanvas::Light(enable);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::LightScale(const mglMatrix *M)
{
mglCanvas::LightScale(M);
GLenum ll[8] = {GL_LIGHT0,GL_LIGHT1,GL_LIGHT2,GL_LIGHT3,GL_LIGHT4,
GL_LIGHT5,GL_LIGHT6,GL_LIGHT7};
float pos[4]={0,0,0,0};
for(int i=0;i<8;i++) // NOTE only global light is used in OpenGL mode
{
pos[0] = light[i].p.x;
pos[1] = light[i].p.y;
pos[2] = light[i].p.z;
if(light[i].n) glLightfv(ll[i], GL_POSITION, pos);
}
}
//-----------------------------------------------------------------------------
void mglCanvasGL::Zoom(mreal x1, mreal y1, mreal x2, mreal y2)
{
glMatrixMode(GL_PROJECTION);//GL_PROJECTION GL_VIEWPORT GL_MODELVIEW
glLoadIdentity();
glScaled(x2-x1,y2-y1,1);
glTranslated((x1+x2-1)/2,(y1+y2-1)/2,0);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::View(mreal TetX,mreal TetY,mreal TetZ)
{
glMatrixMode(GL_PROJECTION);//GL_PROJECTION GL_VIEWPORT GL_MODELVIEW
glRotated(TetX,1.,0.,0.);
glRotated(TetY,0.,1.,0.);
glRotated(TetZ,0.,0.,1.);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::Fog(mreal d, mreal)
{
if(d>0)
{
float back[4]={BDef[0]/255.f,BDef[1]/255.f,BDef[2]/255.f,BDef[3]/255.f};
glFogf(GL_FOG_MODE,GL_EXP);
glFogf(GL_FOG_DENSITY,5*d);
glFogfv(GL_FOG_COLOR,back);
glEnable(GL_FOG);
}
else glDisable(GL_FOG);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::Clf(mglColor Back)
{
mglCanvas::Clf(Back);
if(Back==NC) Back.Set(BDef[0]/255.,BDef[1]/255.,BDef[2]/255.);
gl_clf(Back);
}
//-----------------------------------------------------------------------------
void mglCanvasGL::Clf(const char *col)
{
mglCanvas::Clf(col);
gl_clf(mglColor(BDef[0]/255.,BDef[1]/255.,BDef[2]/255.));
}
//-----------------------------------------------------------------------------
void mglCanvasGL::gl_clf(mglColor Back)
{
if(Back==NC) Back = WC;
// glDepthFunc(GL_LESS);
glDepthFunc(GL_GREATER);
glClearColor(Back.r,Back.g,Back.b,1.);
glClearDepth(-10.);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_COLOR_MATERIAL);
glMatrixMode(GL_MODELVIEW);//GL_MODELVIEW GL_VIEWPORT GL_PROJECTION
glLoadIdentity();
glScaled(2,2,2);
glTranslated(-0.5,-0.5,-0.5);
// float dif[4]={DifBr,DifBr,DifBr,1};
// glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, dif);
float spc[4]={1,1,1,1};
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, spc);
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, DifBr);
}
//-----------------------------------------------------------------------------
/*void mglCanvasGL::EndFrame()
{
// mglGraph::EndFrame();
glEndList();
}
//-----------------------------------------------------------------------------
int mglCanvasGL::NewFrame()
{
Clf(); Identity();
glNewList(CurFrameId,GL_COMPILE);
CurFrameId++;
return CurFrameId-1;
}*/
//-----------------------------------------------------------------------------
unsigned char **mglCanvasGL::GetRGBLines(long &width, long &height, unsigned char *&f, bool alpha)
{
long x, y, d = alpha ? 4:3;
GLint w[4];
glGetIntegerv(GL_VIEWPORT,w);
x=w[0]; y=w[1]; width=w[2]; height=w[3];
unsigned char **p;
p = (unsigned char **)malloc(height * sizeof(unsigned char *));
f = (unsigned char *) malloc(width*height * sizeof(unsigned char)*d);
for(long i=0;i<height;i++) p[i] = f+d*width*(height-1-i);
glReadBuffer(GL_FRONT);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(x, y, width, height, alpha ? GL_RGBA : GL_RGB, GL_UNSIGNED_BYTE, f);
return p;
}
//-----------------------------------------------------------------------------
void mglCanvasGL::quad_draw(long k1, long k2, long k3, long k4)
{
glBegin(GL_QUADS);
glArrayElement(k1); glArrayElement(k2);
glArrayElement(k4); glArrayElement(k3);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::trig_draw(long k1, long k2, long k3)
{
glBegin(GL_TRIANGLES);
glArrayElement(k1); glArrayElement(k2); glArrayElement(k3);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::line_draw(long k1, long k2)
{
if(PDef==0) return;
set_pen(PDef,PenWidth, pPos);
glBegin(GL_LINES);
glArrayElement(k1); glArrayElement(k2);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::quad_draw(const mglPnt &p1, const mglPnt &p2, const mglPnt &p3, const mglPnt &p4, const mglDrawReg *)
{
glBegin(GL_QUADS);
glNormal3f(p1.u,p1.v,p1.w); glColor4f(p1.r,p1.g,p1.b,p1.a); glVertex3f(p1.x,p1.y,p1.z);
glNormal3f(p2.u,p2.v,p2.w); glColor4f(p2.r,p2.g,p2.b,p2.a); glVertex3f(p2.x,p2.y,p2.z);
glNormal3f(p4.u,p4.v,p4.w); glColor4f(p4.r,p4.g,p4.b,p4.a); glVertex3f(p4.x,p4.y,p4.z);
glNormal3f(p3.u,p3.v,p3.w); glColor4f(p3.r,p3.g,p3.b,p3.a); glVertex3f(p3.x,p3.y,p3.z);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::trig_draw(const mglPnt &p1, const mglPnt &p2, const mglPnt &p3, bool, const mglDrawReg *)
{
glBegin(GL_TRIANGLES);
glNormal3f(p1.u,p1.v,p1.w); glColor4f(p1.r,p1.g,p1.b,p1.a); glVertex3f(p1.x,p1.y,p1.z);
glNormal3f(p2.u,p2.v,p2.w); glColor4f(p2.r,p2.g,p2.b,p2.a); glVertex3f(p2.x,p2.y,p2.z);
glNormal3f(p3.u,p3.v,p3.w); glColor4f(p3.r,p3.g,p3.b,p3.a); glVertex3f(p3.x,p3.y,p3.z);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::line_draw(const mglPnt &p1, const mglPnt &p2, const mglDrawReg *)
{
if(PDef==0) return;
set_pen(PDef,PenWidth, pPos);
glBegin(GL_LINES);
glColor4f(p1.r,p1.g,p1.b,p1.a); glVertex3f(p1.x,p1.y,p1.z);
glColor4f(p2.r,p2.g,p2.b,p2.a); glVertex3f(p2.x,p2.y,p2.z);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::pnt_draw(const mglPnt &p1, const mglDrawReg *)
{
glBegin(GL_POINTS);
glColor4f(p1.r,p1.g,p1.b,p1.a); glVertex3f(p1.x,p1.y,p1.z);
glEnd();
}
//-----------------------------------------------------------------------------
void mglCanvasGL::mark_draw(const mglPnt &q, char type, mreal size, mglDrawReg *d)
{
mglPnt p0=q,p1=q,p2=q,p3=q;
mreal ss=fabs(size);
if(type=='.' || ss==0)
{
if(d) d->PenWidth = ss?ss:sqrt(font_factor/400);
pnt_draw(q,d);
}
else
{
if(d)
{
d->PDef = MGL_SOLID_MASK; d->angle = 0;
d->PenWidth*=fabs(50*size);
if(d->PenWidth<1) d->PenWidth=1;
}
if(!strchr("xsSoO",type)) ss *= 1.1;
switch(type)
{
case 'P':
p0.x = q.x-ss; p0.y = q.y-ss; p1.x = q.x+ss; p1.y = q.y-ss;
p2.x = q.x+ss; p2.y = q.y+ss; p3.x = q.x-ss; p3.y = q.y+ss;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p3,d); line_draw(p3,p0,d);
case '+':
p0.x = q.x-ss; p0.y = q.y; p1.x = q.x+ss; p1.y = q.y; line_draw(p0,p1,d);
p2.x = q.x; p2.y = q.y-ss; p3.x = q.x; p3.y = q.y+ss; line_draw(p2,p3,d);
break;
case 'X':
p0.x = q.x-ss; p0.y = q.y-ss; p1.x = q.x+ss; p1.y = q.y-ss;
p2.x = q.x+ss; p2.y = q.y+ss; p3.x = q.x-ss; p3.y = q.y+ss;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p3,d); line_draw(p3,p0,d);
case 'x':
p0.x = q.x-ss; p0.y = q.y-ss; p1.x = q.x+ss; p1.y = q.y+ss; line_draw(p0,p1,d);
p2.x = q.x+ss; p2.y = q.y-ss; p3.x = q.x-ss; p3.y = q.y+ss; line_draw(p2,p3,d);
break;
case 'S':
p0.x = q.x-ss; p0.y = q.y-ss; p1.x = q.x-ss; p1.y = q.y+ss;
p2.x= q.x+ss; p2.y= q.y+ss; p3.x = q.x+ss; p3.y = q.y-ss;
quad_draw(p0,p1,p3,p2,d);
case 's':
p0.x = q.x-ss; p0.y = q.y-ss; p1.x = q.x+ss; p1.y = q.y-ss;
p2.x = q.x+ss; p2.y = q.y+ss; p3.x = q.x-ss; p3.y = q.y+ss;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p3,d); line_draw(p3,p0,d);
break;
case 'D':
p0.x = q.x; p0.y = q.y-ss; p1.x = q.x+ss; p1.y = q.y;
p2.x= q.x; p2.y= q.y+ss; p3.x = q.x-ss; p3.y = q.y;
quad_draw(p0,p1,p3,p2,d);
case 'd':
p0.x = q.x; p0.y = q.y-ss; p1.x = q.x+ss; p1.y = q.y;
p2.x = q.x; p2.y = q.y+ss; p3.x = q.x-ss; p3.y = q.y;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p3,d); line_draw(p3,p0,d);
break;
case 'Y':
p1.x = q.x; p1.y = q.y-ss; line_draw(q,p1,d);
p2.x = q.x-0.8*ss; p2.y = q.y+0.6*ss; line_draw(q,p2,d);
p3.x = q.x+0.8*ss; p3.y = q.y+0.6*ss; line_draw(q,p3,d);
break;
case '*':
p0.x = q.x-ss; p0.y = q.y;
p1.x = q.x+ss; p1.y = q.y; line_draw(p0,p1,d);
p0.x = q.x-0.6*ss; p0.y = q.y-0.8*ss;
p1.x = q.x+0.6*ss; p1.y = q.y+0.8*ss; line_draw(p0,p1,d);
p0.x = q.x-0.6*ss; p0.y = q.y+0.8*ss;
p1.x = q.x+0.6*ss; p1.y = q.y-0.8*ss; line_draw(p0,p1,d);
break;
case 'T':
p0.x = q.x-ss; p0.y = q.y-ss/2;
p1.x = q.x+ss; p1.y = q.y-ss/2;
p2.x= q.x; p2.y= q.y+ss;
trig_draw(p0,p1,p2,false,d);
case '^':
p0.x = q.x-ss; p0.y = q.y-ss/2;
p1.x = q.x+ss; p1.y = q.y-ss/2;
p2.x= q.x; p2.y= q.y+ss;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p0,d); break;
case 'V':
p0.x = q.x-ss; p0.y = q.y+ss/2;
p1.x = q.x+ss; p1.y = q.y+ss/2;
p2.x= q.x; p2.y= q.y-ss;
trig_draw(p0,p1,p2,false,d);
case 'v':
p0.x = q.x-ss; p0.y = q.y+ss/2;
p1.x = q.x+ss; p1.y = q.y+ss/2;
p2.x= q.x; p2.y= q.y-ss;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p0,d); break;
case 'L':
p0.x = q.x+ss/2; p0.y = q.y+ss;
p1.x = q.x+ss/2; p1.y = q.y-ss;
p2.x= q.x-ss; p2.y= q.y;
trig_draw(p0,p1,p2,false,d);
case '<':
p0.x = q.x+ss/2; p0.y = q.y+ss;
p1.x = q.x+ss/2; p1.y = q.y-ss;
p2.x= q.x-ss; p2.y= q.y;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p0,d); break;
case 'R':
p0.x = q.x-ss/2; p0.y = q.y+ss;
p1.x = q.x-ss/2; p1.y = q.y-ss;
p2.x= q.x+ss; p2.y= q.y;
trig_draw(p0,p1,p2,false,d);
case '>':
p0.x = q.x-ss/2; p0.y = q.y+ss;
p1.x = q.x-ss/2; p1.y = q.y-ss;
p2.x= q.x+ss; p2.y= q.y;
line_draw(p0,p1,d); line_draw(p1,p2,d);
line_draw(p2,p0,d); break;
case 'O':
/* for(long j=long(-ss);j<=long(ss);j++) for(long i=long(-ss);i<=long(ss);i++)
{
long x=long(q.x)+i, y=long(q.y)+j;
if(i*i+j*j>=ss*ss || !d || x<d->x1 || x>d->x2 || y<d->y1 || y>d->y2) continue;
if(cs[3]) pnt_plot(x,y,q.z+1,cs,d->ObjId);
}*/
case 'o':
for(long i=0;i<=20;i++) // TODO copy from mark_pix()?!
{
p0 = p1; p1.x = q.x+ss*cos(i*M_PI/10); p1.y = q.y+ss*sin(i*M_PI/10);
if(i>0) line_draw(p0,p1,d);
}
break;
case 'C':
pnt_draw(q,d);
for(long i=0;i<=20;i++)
{
p0 = p1; p1.x = q.x+ss*cos(i*M_PI/10); p1.y = q.y+ss*sin(i*M_PI/10);
if(i>0) line_draw(p0,p1,d);
}
break;
}
}
}
//-----------------------------------------------------------------------------
void mglCanvasGL::glyph_fill(mreal phi, const mglPnt &pp, mreal f, const mglGlyph &g, const mglDrawReg *d)
{
if(!g.trig || g.nt<=0) return;
const mreal co=cos(phi*M_PI/180), si=sin(phi*M_PI/180);
mglPnt q0=pp, q1=pp, q2=pp;
q0.u=q0.v=q1.u=q1.v=q2.u=q2.v=NAN;
for(long ik=0;ik<g.nt;ik++)
{
long ii = 6*ik; mreal x, y;
x = pp.u+g.trig[ii]*f; y = pp.v+g.trig[ii+1]*f;
q0.x = pp.x+(x*co+y*si)/2; q0.y = pp.y+(y*co-x*si)/2; ii+=2;
x = pp.u+g.trig[ii]*f; y = pp.v+g.trig[ii+1]*f;
q1.x = pp.x+(x*co+y*si)/2; q1.y = pp.y+(y*co-x*si)/2; ii+=2;
x = pp.u+g.trig[ii]*f; y = pp.v+g.trig[ii+1]*f;
q2.x = pp.x+(x*co+y*si)/2; q2.y = pp.y+(y*co-x*si)/2;
trig_draw(q0,q1,q2,false,d);
}
}
//-----------------------------------------------------------------------------
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