OpenGL new naming scheme.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11055 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 151 insertions, 0 deletions

diff --git a/src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_font.cxx b/src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_font.cxx
new file mode 100644
index 000000000..24a5fe51b
--- /dev/null
+++ b/src/drivers/OpenGL/Fl_OpenGL_Graphics_Driver_font.cxx
@@ -0,0 +1,151 @@
+//
+// "$Id$"
+//
+// Standard X11 font selection code 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
+//
+
+/*
+ This module implements a lowest-common-denominator font for OpenGL.
+ It will always work, even if the main graphics library does not support
+ rendering text into a texture buffer.
+ 
+ The font is limited to a single face and ASCII characters. It is drawn using
+ lines which makes it arbitrarily scalable. I am trying to keep font data really
+ compact.
+ */
+
+
+#include <FL/gl.h>
+
+// FIXME: check out FreeGlut:
+// FIXME: implement font-to-RGBA in the main graphics driver
+
+#if 1
+
+/*
+  |01234567|
+ -+--------+
+ 0|        |____
+ 1|++++++++|font
+ 2|++++++++|
+ 3|++++++++|
+ 4|++++++++|
+ 5|++++++++|____
+ 6|        |descent
+ 7|        |
+ -+--------+
+ */
+
+
+static const char *font_data[128] = {
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+
+  0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, /*T*/"\11\71\100\41\45", 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+
+  0, 0, 0, 0, 0, /*e*/"\55\25\14\13\22\52\63\64\14", 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, /*s*/"\62\22\13\64\55\15", /*t*/"\41\44\55\65\100\22\62", 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+
+double Fl_OpenGL_Graphics_Driver::width(const char *str, int n) {
+  return size_*n*0.5;
+}
+
+int Fl_OpenGL_Graphics_Driver::descent() {
+  return (int)(size_ - size_*0.8);
+}
+
+int Fl_OpenGL_Graphics_Driver::height() {
+  return (int)(size_*0.8);
+}
+
+void Fl_OpenGL_Graphics_Driver::text_extents(const char *str, int n, int& dx, int& dy, int& w, int& h)
+{
+  dx = 0;
+  dy = descent();
+  w = width(str, n);
+  h = size_;
+}
+
+void Fl_OpenGL_Graphics_Driver::draw(const char *str, int n, int x, int y)
+{
+  int i;
+  for (i=0; i<n; i++) {
+    char c = str[i] & 0x7f;
+    const char *fd = font_data[(int)c];
+    if (fd) {
+      char rendering = 0;
+      float px, py;
+      for (;;) {
+        char cmd = *fd++;
+        if (cmd==0) {
+          if (rendering) {
+            glEnd();
+            glBegin(GL_POINTS); glVertex2f(px, py); glEnd();
+            rendering = 0;
+          }
+          break;
+        } else if (cmd>63) {
+          if (cmd=='\100' && rendering) {
+            glEnd();
+            glBegin(GL_POINTS); glVertex2f(px, py); glEnd();
+            rendering = 0;
+          }
+        } else {
+          if (!rendering) { glBegin(GL_LINE_STRIP); rendering = 1; }
+          int vx = (cmd & '\70')>>3;
+          int vy = (cmd & '\07');
+          px = 0.5+x+vx*size_*0.5/8.0;
+          py = 0.5+y+vy*size_/8.0-0.8*size_;
+          glVertex2f(px, py);
+        }
+      }
+    }
+    x += size_*0.5;
+  }
+}
+
+#elif 0
+
+/*
+extern FL_EXPORT Fl_Glut_StrokeFont glutStrokeRoman;
+extern FL_EXPORT Fl_Glut_StrokeFont glutStrokeMonoRoman;
+#  define GLUT_STROKE_ROMAN             (&glutStrokeRoman)
+#  define GLUT_STROKE_MONO_ROMAN        (&glutStrokeMonoRoman)
+
+FL_EXPORT void glutStrokeCharacter(void *font, int character);
+FL_EXPORT GLfloat glutStrokeHeight(void *font);
+FL_EXPORT int glutStrokeLength(void *font, const unsigned char *string);
+FL_EXPORT void glutStrokeString(void *font, const unsigned char *string);
+FL_EXPORT int glutStrokeWidth(void *font, int character);
+*/
+
+#else
+
+void Fl_OpenGL_Graphics_Driver::draw(const char* str, int n, int x, int y) {
+  gl_draw(str, n, x, y);
+}
+
+#endif
+
+
+//
+// End of "$Id$".
+//