Added OpenGL implementation of fl_vertex calls. Compiling and linking, but functionality untested.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11035 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

5 files changed, 209 insertions, 48 deletions

diff --git a/src/Fl_Gl_Device_Plugin.cxx b/src/Fl_Gl_Device_Plugin.cxx
index 3ad9263ab..3e6144a35 100644
--- a/src/Fl_Gl_Device_Plugin.cxx
+++ b/src/Fl_Gl_Device_Plugin.cxx
@@ -54,6 +54,7 @@ const char *Fl_OpenGL_Display_Device::class_id = "Fl_OpenGL_Display_Device";
 // ------ end of separate file! ------------------------------------------------
 
 #include "cfg_gfx/opengl_rect.cxx"
+#include "cfg_gfx/opengl_vertex.cxx"
 
 
 
diff --git a/src/cfg_gfx/opengl.H b/src/cfg_gfx/opengl.H
index 86abea41a..dae36eb20 100644
--- a/src/cfg_gfx/opengl.H
+++ b/src/cfg_gfx/opengl.H
@@ -62,40 +62,30 @@ public:
   void pop_clip();
   void restore_clip();
   // --- implementation is in src/fl_vertex.cxx which includes src/cfg_gfx/xxx_rect.cxx
-//  void transformed_vertex0(COORD_T x, COORD_T y);
-//  void fixloop();
-//  void push_matrix();
-//  void pop_matrix();
-//  void mult_matrix(double a, double b, double c, double d, double x, double y);
-//  void rotate(double d);
-//  void begin_points();
-//  void begin_line();
-//  void begin_loop();
-//  void begin_polygon();
-//  void begin_complex_polygon();
-//  double transform_x(double x, double y);
-//  double transform_y(double x, double y);
-//  double transform_dx(double x, double y);
-//  double transform_dy(double x, double y);
-//  void transformed_vertex(double xf, double yf);
-//  void vertex(double x, double y);
-//  void end_points();
-//  void end_line();
-//  void end_loop();
-//  void end_polygon();
-//  void end_complex_polygon();
-//  void gap();
-//  void circle(double x, double y, double r);
-  void begin_complex_polygon() { }
-  void transformed_vertex(double xf, double yf) { }
-  void vertex(double x, double y) { }
-  void end_points() { }
-  void end_line() { }
-  void end_loop() { }
-  void end_polygon() { }
-  void end_complex_polygon() { }
-  void gap() { }
-  void circle(double x, double y, double r) { }
+  //  void push_matrix();
+  //  void pop_matrix();
+  //  void mult_matrix(double a, double b, double c, double d, double x, double y);
+  //  void rotate(double d);
+  //  double transform_x(double x, double y);
+  //  double transform_y(double x, double y);
+  //  double transform_dx(double x, double y);
+  //  double transform_dy(double x, double y);
+  void transformed_vertex0(COORD_T x, COORD_T y);
+  void transformed_vertex(double xf, double yf);
+  void vertex(double x, double y);
+  void begin_points();
+  void end_points();
+  void begin_line();
+  void end_line();
+  void begin_loop();
+  void end_loop();
+  void begin_polygon();
+  void end_polygon();
+  void begin_complex_polygon();
+  void gap();
+  void end_complex_polygon();
+  void fixloop();
+  void circle(double x, double y, double r);
 };
 
 
diff --git a/src/cfg_gfx/opengl_vertex.cxx b/src/cfg_gfx/opengl_vertex.cxx
new file mode 100644
index 000000000..cfc5df15b
--- /dev/null
+++ b/src/cfg_gfx/opengl_vertex.cxx
@@ -0,0 +1,143 @@
+//
+// "$Id$"
+//
+// Portable drawing routines for the Fast Light Tool Kit (FLTK).
+//
+// Copyright 1998-2016 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     http://www.fltk.org/COPYING.php
+//
+// Please report all bugs and problems on the following page:
+//
+//     http://www.fltk.org/str.php
+//
+
+#ifndef FL_CFG_GFX_OPENGL_VERTEX_CXX
+#define FL_CFG_GFX_OPENGL_VERTEX_CXX
+
+/**
+  \file opengl_vertex.cxx
+  \brief  Portable drawing code for drawing arbitrary shapes with
+          simple 2D transformations, implemented for OpenGL.
+*/
+
+#include "opengl.H"
+
+#include <FL/fl_draw.H>
+#include <FL/x.h>
+#include <FL/gl.h>
+#include <FL/math.h>
+
+
+// Event though there are faster versions of the functions in OpenGL,
+// we use the default FLTK implementation for compatibility in the
+// following functions.
+
+// void Fl_OpenGL_Graphics_Driver::push_matrix()
+// void Fl_OpenGL_Graphics_Driver::pop_matrix()
+// void Fl_OpenGL_Graphics_Driver::mult_matrix(double a, double b, double c, double d, double x, double y)
+// void Fl_OpenGL_Graphics_Driver::rotate(double d)
+// double Fl_OpenGL_Graphics_Driver::transform_x(double x, double y)
+// double Fl_OpenGL_Graphics_Driver::transform_y(double x, double y)
+// double Fl_OpenGL_Graphics_Driver::transform_dx(double x, double y)
+// double Fl_OpenGL_Graphics_Driver::transform_dy(double x, double y)
+
+void Fl_OpenGL_Graphics_Driver::begin_points() {
+  glBegin(GL_POINTS);
+}
+
+void Fl_OpenGL_Graphics_Driver::end_points() {
+  glEnd();
+}
+
+void Fl_OpenGL_Graphics_Driver::begin_line() {
+  glBegin(GL_LINE_STRIP);
+}
+
+void Fl_OpenGL_Graphics_Driver::end_line() {
+  glEnd();
+}
+
+void Fl_OpenGL_Graphics_Driver::begin_loop() {
+  glBegin(GL_LINE_LOOP);
+}
+
+void Fl_OpenGL_Graphics_Driver::end_loop() {
+  glEnd();
+}
+
+void Fl_OpenGL_Graphics_Driver::begin_polygon() {
+  glBegin(GL_POLYGON);
+}
+
+void Fl_OpenGL_Graphics_Driver::end_polygon() {
+  glEnd();
+}
+
+void Fl_OpenGL_Graphics_Driver::begin_complex_polygon() {
+  glBegin(GL_POLYGON);
+}
+
+void Fl_OpenGL_Graphics_Driver::gap() {
+  glEnd();
+  glBegin(GL_POLYGON);
+}
+
+// FXIME: non-convex polygons are not supported yet
+// use gluTess* functions to do this; search for gluBeginPolygon
+void Fl_OpenGL_Graphics_Driver::end_complex_polygon() {
+  glEnd();
+}
+
+// remove equal points from closed path
+void Fl_OpenGL_Graphics_Driver::fixloop() { }
+
+void Fl_OpenGL_Graphics_Driver::transformed_vertex(double xf, double yf) {
+  glVertex2d(xf, yf);
+}
+
+void Fl_OpenGL_Graphics_Driver::transformed_vertex0(COORD_T x, COORD_T y) {
+  glVertex2d(x, y);
+}
+
+void Fl_OpenGL_Graphics_Driver::vertex(double x,double y) {
+  transformed_vertex0(x*m.a + y*m.c + m.x, x*m.b + y*m.d + m.y);
+}
+
+void Fl_OpenGL_Graphics_Driver::circle(double cx, double cy, double r) {
+  double rx = r * (m.c ? sqrt(m.a*m.a+m.c*m.c) : fabs(m.a));
+  double ry = r * (m.b ? sqrt(m.b*m.b+m.d*m.d) : fabs(m.d));
+  double rMax;
+  if (ry>rx) rMax = ry; else rMax = rx;
+
+  // from http://slabode.exofire.net/circle_draw.shtml and many other places
+  int num_segments = (int)(10 * sqrt(rMax))+1;
+  double theta = 2 * M_PI / float(num_segments);
+  double tangetial_factor = tan(theta);
+  double radial_factor = cosf(theta);//calculate the radial factor
+  double x = r; //we start at angle = 0
+  double y = 0;
+
+  glBegin(GL_LINE_LOOP);
+  for(int ii = 0; ii < num_segments; ii++) {
+    vertex(x + cx, y + cy); // output vertex
+    double tx = -y;
+    double ty = x;
+    x += tx * tangetial_factor;
+    y += ty * tangetial_factor;
+    x *= radial_factor;
+    y *= radial_factor;
+  } 
+  glEnd(); 
+
+}
+
+#endif // FL_CFG_GFX_OPENGL_VERTEX_CXX
+
+//
+// End of "$Id$".
+//
diff --git a/src/fl_arc.cxx b/src/fl_arc.cxx
index 3895ca50a..a37e24ff8 100644
--- a/src/fl_arc.cxx
+++ b/src/fl_arc.cxx
@@ -71,12 +71,6 @@ void Fl_Graphics_Driver::arc(double x, double y, double r, double start, double
   }
 }
 
-#if 0 // portable version.  X-specific one in fl_vertex.cxx
-void fl_circle(double x,double y,double r) {
-  _fl_arc(x, y, r, r, 0, 360);
-}
-#endif
-
 //
 // End of "$Id$".
 //
diff --git a/src/fl_vertex.cxx b/src/fl_vertex.cxx
index ae65fa5d4..16f0a501f 100644
--- a/src/fl_vertex.cxx
+++ b/src/fl_vertex.cxx
@@ -42,6 +42,7 @@
 #include <FL/math.h>
 #include <stdlib.h>
 
+
 void Fl_Graphics_Driver::push_matrix() {
   if (sptr==matrix_stack_size)
     Fl::error("fl_push_matrix(): matrix stack overflow.");
@@ -79,21 +80,53 @@ void Fl_Graphics_Driver::rotate(double d) {
   }
 }
 
-void Fl_Graphics_Driver::begin_points() {n = 0; what = POINT_;}
+void Fl_Graphics_Driver::scale(double x, double y) {
+  mult_matrix(x,0,0,y,0,0);
+}
 
-void Fl_Graphics_Driver::begin_line() {n = 0; what = LINE;}
+void Fl_Graphics_Driver::scale(double x) {
+  mult_matrix(x,0,0,x,0,0);
+}
 
-void Fl_Graphics_Driver::begin_loop() {n = 0; what = LOOP;}
+void Fl_Graphics_Driver::translate(double x,double y) {
+  mult_matrix(1,0,0,1,x,y);
+}
 
-void Fl_Graphics_Driver::begin_polygon() {n = 0; what = POLYGON;}
+void Fl_Graphics_Driver::begin_points() {
+  n = 0;
+  what = POINT_;
+}
 
-double Fl_Graphics_Driver::transform_x(double x, double y) {return x*m.a + y*m.c + m.x;}
+void Fl_Graphics_Driver::begin_line() {
+  n = 0;
+  what = LINE;
+}
 
-double Fl_Graphics_Driver::transform_y(double x, double y) {return x*m.b + y*m.d + m.y;}
+void Fl_Graphics_Driver::begin_loop() {
+  n = 0;
+  what = LOOP;
+}
 
-double Fl_Graphics_Driver::transform_dx(double x, double y) {return x*m.a + y*m.c;}
+void Fl_Graphics_Driver::begin_polygon() {
+  n = 0;
+  what = POLYGON;
+}
 
-double Fl_Graphics_Driver::transform_dy(double x, double y) {return x*m.b + y*m.d;}
+double Fl_Graphics_Driver::transform_x(double x, double y) {
+  return x*m.a + y*m.c + m.x;
+}
+
+double Fl_Graphics_Driver::transform_y(double x, double y) {
+  return x*m.b + y*m.d + m.y;
+}
+
+double Fl_Graphics_Driver::transform_dx(double x, double y) {
+  return x*m.a + y*m.c;
+}
+
+double Fl_Graphics_Driver::transform_dy(double x, double y) {
+  return x*m.b + y*m.d;
+}
 
 void Fl_Graphics_Driver::transformed_vertex0(COORD_T x, COORD_T y) {
   if (!n || x != p[n-1].x || y != p[n-1].y) {