821 lines
25 KiB
C++
821 lines
25 KiB
C++
//-----------------------------------------------------------------------------
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// Helper functions that ultimately draw stuff with gl.
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//
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// Copyright 2008-2013 Jonathan Westhues.
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//-----------------------------------------------------------------------------
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#include "solvespace.h"
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namespace SolveSpace {
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static bool ColorLocked;
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static bool DepthOffsetLocked;
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void ssglLineWidth(GLfloat width) {
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// Intel GPUs with Mesa on *nix render thin lines poorly.
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static bool workaroundChecked, workaroundEnabled;
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if(!workaroundChecked) {
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// ssglLineWidth can be called before GL is initialized
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if(glGetString(GL_VENDOR)) {
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workaroundChecked = true;
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if(!strcmp((char*)glGetString(GL_VENDOR), "Intel Open Source Technology Center"))
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workaroundEnabled = true;
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}
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}
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if(workaroundEnabled && width < 1.6f)
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width = 1.6f;
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glLineWidth(width);
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}
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static void LineDrawCallback(void *fndata, Vector a, Vector b)
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{
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ssglLineWidth(1);
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glBegin(GL_LINES);
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ssglVertex3v(a);
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ssglVertex3v(b);
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glEnd();
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}
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void ssglVertex3v(Vector u)
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{
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glVertex3f((GLfloat)u.x, (GLfloat)u.y, (GLfloat)u.z);
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}
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void ssglAxisAlignedQuad(double l, double r, double t, double b, bool lone)
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{
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if(lone) glBegin(GL_QUADS);
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glVertex2d(l, t);
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glVertex2d(l, b);
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glVertex2d(r, b);
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glVertex2d(r, t);
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if(lone) glEnd();
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}
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void ssglAxisAlignedLineLoop(double l, double r, double t, double b)
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{
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glBegin(GL_LINE_LOOP);
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glVertex2d(l, t);
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glVertex2d(l, b);
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glVertex2d(r, b);
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glVertex2d(r, t);
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glEnd();
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}
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static void FatLineEndcap(Vector p, Vector u, Vector v)
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{
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// A table of cos and sin of (pi*i/10 + pi/2), as i goes from 0 to 10
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static const double Circle[11][2] = {
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{ 0.0000, 1.0000 },
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{ -0.3090, 0.9511 },
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{ -0.5878, 0.8090 },
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{ -0.8090, 0.5878 },
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{ -0.9511, 0.3090 },
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{ -1.0000, 0.0000 },
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{ -0.9511, -0.3090 },
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{ -0.8090, -0.5878 },
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{ -0.5878, -0.8090 },
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{ -0.3090, -0.9511 },
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{ 0.0000, -1.0000 },
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};
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glBegin(GL_TRIANGLE_FAN);
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for(int i = 0; i <= 10; i++) {
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double c = Circle[i][0], s = Circle[i][1];
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ssglVertex3v(p.Plus(u.ScaledBy(c)).Plus(v.ScaledBy(s)));
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}
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glEnd();
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}
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void ssglLine(const Vector &a, const Vector &b, double pixelWidth, bool maybeFat) {
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if(!maybeFat || pixelWidth <= 3.0) {
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glBegin(GL_LINES);
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ssglVertex3v(a);
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ssglVertex3v(b);
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glEnd();
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} else {
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ssglFatLine(a, b, pixelWidth / SS.GW.scale);
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}
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}
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void ssglPoint(Vector p, double pixelSize)
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{
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if(/*!maybeFat || */pixelSize <= 3.0) {
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glBegin(GL_LINES);
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Vector u = SS.GW.projRight.WithMagnitude(pixelSize / SS.GW.scale / 2.0);
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ssglVertex3v(p.Minus(u));
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ssglVertex3v(p.Plus(u));
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glEnd();
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} else {
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Vector u = SS.GW.projRight.WithMagnitude(pixelSize / SS.GW.scale / 2.0);
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Vector v = SS.GW.projUp.WithMagnitude(pixelSize / SS.GW.scale / 2.0);
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FatLineEndcap(p, u, v);
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FatLineEndcap(p, u.ScaledBy(-1.0), v);
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}
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}
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void ssglStippledLine(Vector a, Vector b, double width,
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int stippleType, double stippleScale, bool maybeFat)
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{
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const char *stipplePattern;
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switch(stippleType) {
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case Style::STIPPLE_CONTINUOUS: ssglLine(a, b, width, maybeFat); return;
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case Style::STIPPLE_DASH: stipplePattern = "- "; break;
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case Style::STIPPLE_LONG_DASH: stipplePattern = "_ "; break;
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case Style::STIPPLE_DASH_DOT: stipplePattern = "-."; break;
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case Style::STIPPLE_DASH_DOT_DOT: stipplePattern = "-.."; break;
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case Style::STIPPLE_DOT: stipplePattern = "."; break;
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case Style::STIPPLE_FREEHAND: stipplePattern = "~"; break;
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case Style::STIPPLE_ZIGZAG: stipplePattern = "~__"; break;
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default: ssassert(false, "Unexpected stipple pattern");
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}
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ssglStippledLine(a, b, width, stipplePattern, stippleScale, maybeFat);
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}
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void ssglStippledLine(Vector a, Vector b, double width,
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const char *stipplePattern, double stippleScale, bool maybeFat)
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{
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ssassert(stipplePattern != NULL, "Unexpected stipple pattern");
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Vector dir = b.Minus(a);
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double len = dir.Magnitude();
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dir = dir.WithMagnitude(1.0);
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const char *si = stipplePattern;
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double end = len;
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double ss = stippleScale / 2.0;
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do {
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double start = end;
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switch(*si) {
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case ' ':
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end -= 1.0 * ss;
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break;
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case '-':
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start = max(start - 0.5 * ss, 0.0);
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end = max(start - 2.0 * ss, 0.0);
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if(start == end) break;
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ssglLine(a.Plus(dir.ScaledBy(start)), a.Plus(dir.ScaledBy(end)), width, maybeFat);
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end = max(end - 0.5 * ss, 0.0);
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break;
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case '_':
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end = max(end - 4.0 * ss, 0.0);
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ssglLine(a.Plus(dir.ScaledBy(start)), a.Plus(dir.ScaledBy(end)), width, maybeFat);
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break;
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case '.':
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end = max(end - 0.5 * ss, 0.0);
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if(end == 0.0) break;
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ssglPoint(a.Plus(dir.ScaledBy(end)), width);
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end = max(end - 0.5 * ss, 0.0);
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break;
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case '~': {
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Vector ab = b.Minus(a);
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Vector gn = (SS.GW.projRight).Cross(SS.GW.projUp);
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Vector abn = (ab.Cross(gn)).WithMagnitude(1);
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abn = abn.Minus(gn.ScaledBy(gn.Dot(abn)));
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double pws = 2.0 * width / SS.GW.scale;
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end = max(end - 0.5 * ss, 0.0);
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Vector aa = a.Plus(dir.ScaledBy(start));
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Vector bb = a.Plus(dir.ScaledBy(end))
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.Plus(abn.ScaledBy(pws * (start - end) / (0.5 * ss)));
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ssglLine(aa, bb, width, maybeFat);
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if(end == 0.0) break;
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start = end;
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end = max(end - 1.0 * ss, 0.0);
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aa = a.Plus(dir.ScaledBy(end))
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.Plus(abn.ScaledBy(pws))
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.Minus(abn.ScaledBy(2.0 * pws * (start - end) / ss));
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ssglLine(bb, aa, width, maybeFat);
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if(end == 0.0) break;
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start = end;
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end = max(end - 0.5 * ss, 0.0);
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bb = a.Plus(dir.ScaledBy(end))
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.Minus(abn.ScaledBy(pws))
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.Plus(abn.ScaledBy(pws * (start - end) / (0.5 * ss)));
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ssglLine(aa, bb, width, maybeFat);
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break;
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}
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default: ssassert(false, "Unexpected stipple pattern element");
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}
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if(*(++si) == 0) si = stipplePattern;
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} while(end > 0.0);
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}
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void ssglFatLine(Vector a, Vector b, double width)
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{
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if(a.EqualsExactly(b)) return;
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// The half-width of the line we're drawing.
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double hw = width / 2;
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Vector ab = b.Minus(a);
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Vector gn = (SS.GW.projRight).Cross(SS.GW.projUp);
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Vector abn = (ab.Cross(gn)).WithMagnitude(1);
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abn = abn.Minus(gn.ScaledBy(gn.Dot(abn)));
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// So now abn is normal to the projection of ab into the screen, so the
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// line will always have constant thickness as the view is rotated.
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abn = abn.WithMagnitude(hw);
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ab = gn.Cross(abn);
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ab = ab. WithMagnitude(hw);
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// The body of a line is a quad
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glBegin(GL_QUADS);
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ssglVertex3v(a.Minus(abn));
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ssglVertex3v(b.Minus(abn));
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ssglVertex3v(b.Plus (abn));
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ssglVertex3v(a.Plus (abn));
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glEnd();
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// And the line has two semi-circular end caps.
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FatLineEndcap(a, ab, abn);
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FatLineEndcap(b, ab.ScaledBy(-1), abn);
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}
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void ssglLockColorTo(RgbaColor rgb)
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{
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ColorLocked = false;
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glColor3d(rgb.redF(), rgb.greenF(), rgb.blueF());
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ColorLocked = true;
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}
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void ssglUnlockColor()
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{
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ColorLocked = false;
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}
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void ssglColorRGB(RgbaColor rgb)
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{
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// Is there a bug in some graphics drivers where this is not equivalent
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// to glColor3d? There seems to be...
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ssglColorRGBa(rgb, 1.0);
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}
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void ssglColorRGBa(RgbaColor rgb, double a)
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{
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if(!ColorLocked) glColor4d(rgb.redF(), rgb.greenF(), rgb.blueF(), a);
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}
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static void Stipple(bool forSel)
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{
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static bool Init;
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const int BYTES = (32*32)/8;
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static GLubyte HoverMask[BYTES];
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static GLubyte SelMask[BYTES];
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if(!Init) {
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int x, y;
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for(x = 0; x < 32; x++) {
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for(y = 0; y < 32; y++) {
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int i = y*4 + x/8, b = x % 8;
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int ym = y % 4, xm = x % 4;
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for(int k = 0; k < 2; k++) {
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if(xm >= 1 && xm <= 2 && ym >= 1 && ym <= 2) {
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(k == 0 ? SelMask : HoverMask)[i] |= (0x80 >> b);
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}
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ym = (ym + 2) % 4; xm = (xm + 2) % 4;
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}
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}
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}
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Init = true;
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}
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glEnable(GL_POLYGON_STIPPLE);
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if(forSel) {
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glPolygonStipple(SelMask);
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} else {
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glPolygonStipple(HoverMask);
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}
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}
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static void StippleTriangle(STriangle *tr, bool s, RgbaColor rgb)
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{
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glEnd();
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glDisable(GL_LIGHTING);
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ssglColorRGB(rgb);
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Stipple(s);
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glBegin(GL_TRIANGLES);
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ssglVertex3v(tr->a);
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ssglVertex3v(tr->b);
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ssglVertex3v(tr->c);
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glEnd();
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glEnable(GL_LIGHTING);
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glDisable(GL_POLYGON_STIPPLE);
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glBegin(GL_TRIANGLES);
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}
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void ssglFillMesh(bool useSpecColor, RgbaColor specColor,
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SMesh *m, uint32_t h, uint32_t s1, uint32_t s2)
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{
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RgbaColor rgbHovered = Style::Color(Style::HOVERED),
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rgbSelected = Style::Color(Style::SELECTED);
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glEnable(GL_NORMALIZE);
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bool hasMaterial = false;
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RgbaColor prevColor;
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glBegin(GL_TRIANGLES);
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for(int i = 0; i < m->l.n; i++) {
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STriangle *tr = &(m->l.elem[i]);
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RgbaColor color;
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if(useSpecColor) {
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color = specColor;
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} else {
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color = tr->meta.color;
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}
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if(!hasMaterial || !color.Equals(prevColor)) {
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GLfloat mpf[] = { color.redF(), color.greenF(), color.blueF(), color.alphaF() };
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glEnd();
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, mpf);
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prevColor = color;
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hasMaterial = true;
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glBegin(GL_TRIANGLES);
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}
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if(tr->an.EqualsExactly(Vector::From(0, 0, 0))) {
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// Compute the normal from the vertices
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Vector n = tr->Normal();
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glNormal3d(n.x, n.y, n.z);
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ssglVertex3v(tr->a);
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ssglVertex3v(tr->b);
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ssglVertex3v(tr->c);
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} else {
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// Use the exact normals that are specified
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glNormal3d((tr->an).x, (tr->an).y, (tr->an).z);
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ssglVertex3v(tr->a);
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glNormal3d((tr->bn).x, (tr->bn).y, (tr->bn).z);
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ssglVertex3v(tr->b);
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glNormal3d((tr->cn).x, (tr->cn).y, (tr->cn).z);
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ssglVertex3v(tr->c);
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}
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if((s1 != 0 && tr->meta.face == s1) ||
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(s2 != 0 && tr->meta.face == s2))
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{
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StippleTriangle(tr, true, rgbSelected);
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}
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if(h != 0 && tr->meta.face == h) {
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StippleTriangle(tr, false, rgbHovered);
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}
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}
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glEnd();
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}
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static void SSGL_CALLBACK Vertex(Vector *p)
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{
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ssglVertex3v(*p);
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}
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void ssglFillPolygon(SPolygon *p)
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{
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GLUtesselator *gt = gluNewTess();
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gluTessCallback(gt, GLU_TESS_BEGIN, (ssglCallbackFptr *)glBegin);
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gluTessCallback(gt, GLU_TESS_END, (ssglCallbackFptr *)glEnd);
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gluTessCallback(gt, GLU_TESS_VERTEX, (ssglCallbackFptr *)Vertex);
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ssglTesselatePolygon(gt, p);
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gluDeleteTess(gt);
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}
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static void SSGL_CALLBACK Combine(double coords[3], void *vertexData[4],
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float weight[4], void **outData)
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{
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Vector *n = (Vector *)AllocTemporary(sizeof(Vector));
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n->x = coords[0];
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n->y = coords[1];
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n->z = coords[2];
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*outData = n;
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}
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void ssglTesselatePolygon(GLUtesselator *gt, SPolygon *p)
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{
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int i, j;
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gluTessCallback(gt, GLU_TESS_COMBINE, (ssglCallbackFptr *)Combine);
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gluTessProperty(gt, GLU_TESS_WINDING_RULE, GLU_TESS_WINDING_ODD);
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Vector normal = p->normal;
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glNormal3d(normal.x, normal.y, normal.z);
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gluTessNormal(gt, normal.x, normal.y, normal.z);
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gluTessBeginPolygon(gt, NULL);
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for(i = 0; i < p->l.n; i++) {
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SContour *sc = &(p->l.elem[i]);
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gluTessBeginContour(gt);
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for(j = 0; j < (sc->l.n-1); j++) {
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SPoint *sp = &(sc->l.elem[j]);
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double ap[3];
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ap[0] = sp->p.x;
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ap[1] = sp->p.y;
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ap[2] = sp->p.z;
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gluTessVertex(gt, ap, &(sp->p));
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}
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gluTessEndContour(gt);
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}
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gluTessEndPolygon(gt);
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}
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void ssglDebugPolygon(SPolygon *p)
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{
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int i, j;
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ssglLineWidth(2);
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glPointSize(7);
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glDisable(GL_DEPTH_TEST);
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for(i = 0; i < p->l.n; i++) {
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SContour *sc = &(p->l.elem[i]);
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for(j = 0; j < (sc->l.n-1); j++) {
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Vector a = (sc->l.elem[j]).p;
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Vector b = (sc->l.elem[j+1]).p;
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ssglLockColorTo(RGBi(0, 0, 255));
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Vector d = (a.Minus(b)).WithMagnitude(-0);
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glBegin(GL_LINES);
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ssglVertex3v(a.Plus(d));
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ssglVertex3v(b.Minus(d));
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glEnd();
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ssglLockColorTo(RGBi(255, 0, 0));
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glBegin(GL_POINTS);
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ssglVertex3v(a.Plus(d));
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ssglVertex3v(b.Minus(d));
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glEnd();
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}
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}
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}
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void ssglDrawEdges(SEdgeList *el, bool endpointsToo, hStyle hs)
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{
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double lineWidth = Style::Width(hs);
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int stippleType = Style::PatternType(hs);
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double stippleScale = Style::StippleScaleMm(hs);
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ssglLineWidth(float(lineWidth));
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ssglColorRGB(Style::Color(hs));
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SEdge *se;
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for(se = el->l.First(); se; se = el->l.NextAfter(se)) {
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ssglStippledLine(se->a, se->b, lineWidth, stippleType, stippleScale,
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/*maybeFat=*/true);
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}
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if(endpointsToo) {
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glPointSize(12);
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glBegin(GL_POINTS);
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for(se = el->l.First(); se; se = el->l.NextAfter(se)) {
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ssglVertex3v(se->a);
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ssglVertex3v(se->b);
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}
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glEnd();
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}
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}
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void ssglDrawOutlines(SOutlineList *sol, Vector projDir, hStyle hs)
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{
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double lineWidth = Style::Width(hs);
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int stippleType = Style::PatternType(hs);
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double stippleScale = Style::StippleScaleMm(hs);
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ssglLineWidth((float)lineWidth);
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ssglColorRGB(Style::Color(hs));
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|
|
for(SOutline *so = sol->l.First(); so; so = sol->l.NextAfter(so)) {
|
|
if(!so->IsVisible(projDir)) continue;
|
|
ssglStippledLine(so->a, so->b, lineWidth, stippleType, stippleScale,
|
|
/*maybeFat=*/true);
|
|
}
|
|
}
|
|
|
|
void ssglDebugMesh(SMesh *m)
|
|
{
|
|
int i;
|
|
ssglLineWidth(1);
|
|
glPointSize(7);
|
|
ssglDepthRangeOffset(1);
|
|
ssglUnlockColor();
|
|
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
|
|
ssglColorRGBa(RGBi(0, 255, 0), 1.0);
|
|
glBegin(GL_TRIANGLES);
|
|
for(i = 0; i < m->l.n; i++) {
|
|
STriangle *t = &(m->l.elem[i]);
|
|
if(t->tag) continue;
|
|
|
|
ssglVertex3v(t->a);
|
|
ssglVertex3v(t->b);
|
|
ssglVertex3v(t->c);
|
|
}
|
|
glEnd();
|
|
ssglDepthRangeOffset(0);
|
|
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
|
|
}
|
|
|
|
void ssglMarkPolygonNormal(SPolygon *p)
|
|
{
|
|
Vector tail = Vector::From(0, 0, 0);
|
|
int i, j, cnt = 0;
|
|
// Choose some reasonable center point.
|
|
for(i = 0; i < p->l.n; i++) {
|
|
SContour *sc = &(p->l.elem[i]);
|
|
for(j = 0; j < (sc->l.n-1); j++) {
|
|
SPoint *sp = &(sc->l.elem[j]);
|
|
tail = tail.Plus(sp->p);
|
|
cnt++;
|
|
}
|
|
}
|
|
if(cnt == 0) return;
|
|
tail = tail.ScaledBy(1.0/cnt);
|
|
|
|
Vector gn = SS.GW.projRight.Cross(SS.GW.projUp);
|
|
Vector tip = tail.Plus((p->normal).WithMagnitude(40/SS.GW.scale));
|
|
Vector arrow = (p->normal).WithMagnitude(15/SS.GW.scale);
|
|
|
|
glColor3d(1, 1, 0);
|
|
glBegin(GL_LINES);
|
|
ssglVertex3v(tail);
|
|
ssglVertex3v(tip);
|
|
ssglVertex3v(tip);
|
|
ssglVertex3v(tip.Minus(arrow.RotatedAbout(gn, 0.6)));
|
|
ssglVertex3v(tip);
|
|
ssglVertex3v(tip.Minus(arrow.RotatedAbout(gn, -0.6)));
|
|
glEnd();
|
|
glEnable(GL_LIGHTING);
|
|
}
|
|
|
|
void ssglDepthRangeOffset(int units)
|
|
{
|
|
if(!DepthOffsetLocked) {
|
|
// The size of this step depends on the resolution of the Z buffer; for
|
|
// a 16-bit buffer, this should be fine.
|
|
double d = units/60000.0;
|
|
glDepthRange(0.1-d, 1-d);
|
|
}
|
|
}
|
|
|
|
void ssglDepthRangeLockToFront(bool yes)
|
|
{
|
|
if(yes) {
|
|
DepthOffsetLocked = true;
|
|
glDepthRange(0, 0);
|
|
} else {
|
|
DepthOffsetLocked = false;
|
|
ssglDepthRangeOffset(0);
|
|
}
|
|
}
|
|
|
|
void ssglDrawPixmap(const Pixmap &pixmap, bool flip) {
|
|
glBindTexture(GL_TEXTURE_2D, TEXTURE_DRAW_PIXELS);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
|
|
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
|
|
|
int format = pixmap.hasAlpha ? GL_RGBA : GL_RGB;
|
|
glTexImage2D(GL_TEXTURE_2D, 0, format, pixmap.width, pixmap.height, 0,
|
|
format, GL_UNSIGNED_BYTE, &pixmap.data[0]);
|
|
|
|
glEnable(GL_TEXTURE_2D);
|
|
glBegin(GL_QUADS);
|
|
glTexCoord2d(0.0, flip ? 0.0 : 1.0);
|
|
glVertex2d(0.0, (double)pixmap.height);
|
|
|
|
glTexCoord2d(1.0, flip ? 0.0 : 1.0);
|
|
glVertex2d((double)pixmap.width, (double)pixmap.height);
|
|
|
|
glTexCoord2d(1.0, flip ? 1.0 : 0.0);
|
|
glVertex2d((double)pixmap.width, 0.0);
|
|
|
|
glTexCoord2d(0.0, flip ? 1.0 : 0.0);
|
|
glVertex2d(0.0, 0.0);
|
|
glEnd();
|
|
glDisable(GL_TEXTURE_2D);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Bitmap font rendering
|
|
//-----------------------------------------------------------------------------
|
|
|
|
static BitmapFont BuiltinBitmapFont;
|
|
static void LoadBitmapFont() {
|
|
if(!BuiltinBitmapFont.IsEmpty()) return;
|
|
|
|
BuiltinBitmapFont = BitmapFont::From(LoadStringFromGzip("fonts/unifont.hex.gz"));
|
|
BuiltinBitmapFont.AddGlyph(0xE000, LoadPNG("fonts/private/0-check-false.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE001, LoadPNG("fonts/private/1-check-true.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE002, LoadPNG("fonts/private/2-radio-false.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE003, LoadPNG("fonts/private/3-radio-true.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE004, LoadPNG("fonts/private/4-stipple-dot.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE005, LoadPNG("fonts/private/5-stipple-dash-long.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE006, LoadPNG("fonts/private/6-stipple-dash.png"));
|
|
BuiltinBitmapFont.AddGlyph(0xE007, LoadPNG("fonts/private/7-stipple-zigzag.png"));
|
|
// Unifont doesn't have a glyph for U+0020.
|
|
BuiltinBitmapFont.AddGlyph(0x20, Pixmap({ 8, 16, 8*3, false, std::vector<uint8_t>(8*16*3) }));
|
|
}
|
|
|
|
void ssglInitializeBitmapFont()
|
|
{
|
|
LoadBitmapFont();
|
|
|
|
glBindTexture(GL_TEXTURE_2D, TEXTURE_BITMAP_FONT);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
|
|
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA,
|
|
BitmapFont::TEXTURE_DIM, BitmapFont::TEXTURE_DIM,
|
|
0, GL_ALPHA, GL_UNSIGNED_BYTE, &BuiltinBitmapFont.texture[0]);
|
|
}
|
|
|
|
int ssglBitmapCharWidth(char32_t codepoint) {
|
|
if(codepoint >= 0xe000 && codepoint <= 0xefff) {
|
|
// These are special-cased because checkboxes predate support for 2 cell wide
|
|
// characters; and so all Printf() calls pad them with spaces.
|
|
return 1;
|
|
}
|
|
|
|
LoadBitmapFont();
|
|
return BuiltinBitmapFont.GetGlyph(codepoint).advanceCells;
|
|
}
|
|
|
|
double ssglBitmapCharQuad(char32_t codepoint, double x, double y)
|
|
{
|
|
double s0, t0, s1, t1;
|
|
size_t w, h;
|
|
if(BuiltinBitmapFont.LocateGlyph(codepoint, &s0, &t0, &s1, &t1, &w, &h)) {
|
|
// LocateGlyph modified the texture, reload it.
|
|
glEnd();
|
|
ssglInitializeBitmapFont();
|
|
glBegin(GL_QUADS);
|
|
}
|
|
|
|
if(codepoint >= 0xe000 && codepoint <= 0xefff) {
|
|
// Special character, like a checkbox or a radio button
|
|
x -= 3;
|
|
}
|
|
|
|
glTexCoord2d(s0, t0);
|
|
glVertex2d(x, y - h);
|
|
|
|
glTexCoord2d(s0, t1);
|
|
glVertex2d(x, y);
|
|
|
|
glTexCoord2d(s1, t1);
|
|
glVertex2d(x + w, y);
|
|
|
|
glTexCoord2d(s1, t0);
|
|
glVertex2d(x + w, y - h);
|
|
|
|
return w;
|
|
}
|
|
|
|
void ssglBitmapText(const std::string &str, Vector p)
|
|
{
|
|
glEnable(GL_TEXTURE_2D);
|
|
glBegin(GL_QUADS);
|
|
for(char32_t codepoint : ReadUTF8(str)) {
|
|
p.x += ssglBitmapCharQuad(codepoint, p.x, p.y);
|
|
}
|
|
glEnd();
|
|
glDisable(GL_TEXTURE_2D);
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Bitmap font rendering
|
|
//-----------------------------------------------------------------------------
|
|
|
|
static VectorFont BuiltinVectorFont;
|
|
static void LoadVectorFont() {
|
|
if(!BuiltinVectorFont.IsEmpty()) return;
|
|
|
|
BuiltinVectorFont = VectorFont::From(LoadStringFromGzip("fonts/unicode.lff.gz"));
|
|
}
|
|
|
|
// Internally and in the UI, the vector font is sized using cap height.
|
|
#define FONT_SCALE(h) ((h)/(double)BuiltinVectorFont.capHeight)
|
|
|
|
double ssglStrCapHeight(double h)
|
|
{
|
|
return BuiltinVectorFont.capHeight *
|
|
FONT_SCALE(h) / SS.GW.scale;
|
|
}
|
|
|
|
double ssglStrFontSize(double h)
|
|
{
|
|
return (BuiltinVectorFont.ascender - BuiltinVectorFont.descender) *
|
|
FONT_SCALE(h) / SS.GW.scale;
|
|
}
|
|
|
|
double ssglStrWidth(const std::string &str, double h)
|
|
{
|
|
LoadVectorFont();
|
|
|
|
double width = 0;
|
|
for(char32_t codepoint : ReadUTF8(str)) {
|
|
width += BuiltinVectorFont.GetGlyph(codepoint).advanceWidth;
|
|
}
|
|
return width * FONT_SCALE(h) / SS.GW.scale;
|
|
}
|
|
|
|
static Vector PixelAlign(Vector v) {
|
|
v = SS.GW.ProjectPoint3(v);
|
|
v.x = floor(v.x) + 0.5;
|
|
v.y = floor(v.y) + 0.5;
|
|
v = SS.GW.UnProjectPoint3(v);
|
|
return v;
|
|
}
|
|
|
|
static double DrawCharacter(const VectorFont::Glyph &glyph, Vector t, Vector o, Vector u, Vector v,
|
|
double scale, ssglLineFn *fn, void *fndata, bool gridFit) {
|
|
double advanceWidth = glyph.advanceWidth;
|
|
|
|
double actualWidth, offsetX;
|
|
if(gridFit) {
|
|
o.x += glyph.leftSideBearing;
|
|
offsetX = glyph.leftSideBearing;
|
|
actualWidth = glyph.boundingWidth;
|
|
if(actualWidth == 0) {
|
|
// Dot, "i", etc.
|
|
actualWidth = 1;
|
|
}
|
|
} else {
|
|
offsetX = 0;
|
|
actualWidth = advanceWidth;
|
|
}
|
|
|
|
Vector tt = t;
|
|
tt = tt.Plus(u.ScaledBy(o.x * scale));
|
|
tt = tt.Plus(v.ScaledBy(o.y * scale));
|
|
|
|
Vector tu = tt;
|
|
tu = tu.Plus(u.ScaledBy(actualWidth * scale));
|
|
|
|
Vector tv = tt;
|
|
tv = tv.Plus(v.ScaledBy(BuiltinVectorFont.capHeight * scale));
|
|
|
|
if(gridFit) {
|
|
tt = PixelAlign(tt);
|
|
tu = PixelAlign(tu);
|
|
tv = PixelAlign(tv);
|
|
}
|
|
|
|
tu = tu.Minus(tt).ScaledBy(1.0 / actualWidth);
|
|
tv = tv.Minus(tt).ScaledBy(1.0 / BuiltinVectorFont.capHeight);
|
|
|
|
for(const VectorFont::Contour &contour : glyph.contours) {
|
|
Vector prevp;
|
|
bool penUp = true;
|
|
for(const Point2d &pt : contour.points) {
|
|
Vector p = tt;
|
|
p = p.Plus(tu.ScaledBy(pt.x - offsetX));
|
|
p = p.Plus(tv.ScaledBy(pt.y));
|
|
if(!penUp) fn(fndata, prevp, p);
|
|
prevp = p;
|
|
penUp = false;
|
|
}
|
|
}
|
|
|
|
return advanceWidth;
|
|
}
|
|
|
|
void ssglWriteText(const std::string &str, double h, Vector t, Vector u, Vector v,
|
|
ssglLineFn *fn, void *fndata)
|
|
{
|
|
LoadVectorFont();
|
|
|
|
if(!fn) fn = LineDrawCallback;
|
|
u = u.WithMagnitude(1);
|
|
v = v.WithMagnitude(1);
|
|
|
|
// Perform grid-fitting only when the text is parallel to the view plane.
|
|
bool gridFit = !SS.exportMode && u.Equals(SS.GW.projRight) && v.Equals(SS.GW.projUp);
|
|
|
|
double scale = FONT_SCALE(h) / SS.GW.scale;
|
|
Vector o = {};
|
|
for(char32_t codepoint : ReadUTF8(str)) {
|
|
o.x += DrawCharacter(BuiltinVectorFont.GetGlyph(codepoint),
|
|
t, o, u, v, scale, fn, fndata, gridFit);
|
|
}
|
|
}
|
|
|
|
void ssglWriteTextRefCenter(const std::string &str, double h, Vector t, Vector u, Vector v,
|
|
ssglLineFn *fn, void *fndata)
|
|
{
|
|
LoadVectorFont();
|
|
|
|
u = u.WithMagnitude(1);
|
|
v = v.WithMagnitude(1);
|
|
|
|
double fh = ssglStrCapHeight(h);
|
|
double fw = ssglStrWidth(str, h);
|
|
|
|
t = t.Plus(u.ScaledBy(-fw/2));
|
|
t = t.Plus(v.ScaledBy(-fh/2));
|
|
|
|
ssglWriteText(str, h, t, u, v, fn, fndata);
|
|
}
|
|
|
|
};
|