--- libgender/shader.C	2004/10/24 02:13:43	1.12
+++ libgender/shader.C	2006/01/25 22:48:02	1.32
@@ -3,17 +3,20 @@
 #include "shader.h"
 #include "shader_vars.h"
 
+#include <sstream>
+#include <iomanip>
+
 namespace shader {
 
+  using namespace std;
+
   refcounted::~refcounted ()
   {
-#if 1
     if (refcnt)
       abort ();
-#endif
   }
 
-  void refcounted::refcnt_dec () const
+  void refcounted::refcnt_destroy () const
   {
     if (!--refcnt)
       delete this; // quite a bit of code...
@@ -39,119 +42,60 @@
 
   unsigned int var_i::next_id = 0;
 
-  var_i::var_i (const char *typestr)
-  : typestr (typestr)
+  var_i::var_i (const char *domainstr, const char *typestr)
+  : domainstr (domainstr), typestr (typestr)
   {
-    //param = cgCreateParameter (cg_context, cgtype);
   }
 
   var_i::~var_i ()
   {
-    //cgDestroyParameter (param);
   }
 
+#if 0
   stream_i::stream_i (const char *strtype)
   : var_i (strtype)
   {
-    sprintf (name, "V%lx_%d", ((long)this >> 4) & 0xfff, ++next_id);
+    sprintf (name, "V%d", ++next_id);
   }
+#endif
 
   temporary_i::temporary_i (const char *strtype)
-  : var_i (strtype)
+  : var_i (0, strtype)
   {
-    sprintf (name, "T%lx_%d", ((long)this >> 4) & 0xfff, ++next_id);
+    sprintf (name, "T%d", ++next_id);
   }
 
-  uniform_i::uniform_i (const char *strtype)
-  : var_i (strtype), dirty (true)
+  varying_i::varying_i (const char *strtype)
+  : var_i ("varying", strtype)
   {
-    sprintf (name, "U%lx_%d", ((long)this >> 4) & 0xfff, ++next_id);
+    sprintf (name, "V%d", ++next_id);
   }
 
-  fragment_string_i::~fragment_string_i ()
+  uniform_i::uniform_i (const char *strtype)
+  : var_i ("uniform", strtype)
   {
-    free (str);
+    sprintf (name, "U%d", ++next_id);
   }
 
   ////////////////////////////////////////////////////////////////////////////
 
-  void var_i::build_decl (ostringstream &b)
+  void var_i::operator ()() const
   {
-    b << typestr << ' ' << name;
-  }
-
-  void uniform_i::build_decl (ostringstream &b)
-  {
-    b << "uniform " << typestr << ' ' << name;
-  }
+    shader_builder::cur->code << name;
 
-  void stream_i::build_decl (ostringstream &b)
-  {
-    b << typestr << ' ' << name;
+    if (shader_builder::cur->first (this))
+      {
+        if (domainstr)
+          shader_builder::cur->global << domainstr << ' ' << typestr << ' ' << name << ";\n";
+        else
+          shader_builder::cur->local << "  " << typestr << ' ' << name << ";\n";
+      }
   }
 
   ////////////////////////////////////////////////////////////////////////////
 
-  void glvar_i::build (shader_builder &b)
-  {
-    b << name;
-  }
-
-  void var_i::build (shader_builder &b)
-  {
-    b << name;
-  }
-
-  void uniform_i::build (shader_builder &b)
-  {
-    var_i::build (b);
-
-    if (find (b.refs.begin (), b.refs.end (), uniform (*this)) == b.refs.end ())
-      b.refs.push_back (*this);
-  }
-
-  void stream_i::build (shader_builder &b)
-  {
-    var_i::build (b);
-
-    if (find (b.streams.begin (), b.streams.end (), var (*this)) == b.streams.end ())
-      b.streams.push_back (*this);
-  }
-
-  void temporary_i::build (shader_builder &b)
-  {
-    var_i::build (b);
-
-    if (find (b.temps.begin (), b.temps.end (), var (*this)) == b.temps.end ())
-      b.temps.push_back (*this);
-  }
-
-  void fragment_vector_i::build (shader_builder &b)
-  {
-    for (vector<fragment>::iterator i = begin (); i != end (); i++)
-      (*i)->build (b);
-  }
-
-  void fragment_const_string_i::build (shader_builder &b)
-  {
-    b << str;
-  }
-
-  void fragment_string_i::build (shader_builder &b)
-  {
-    b << str;
-  }
-
-#if 0
-  void statement_i::build (shader_builder &b)
-  {
-    b << "  ";
-    fragment_vector_i::build (b);
-    b << ";\n";
-  }
-#endif
-
-  ////////////////////////////////////////////////////////////////////////////
+  int texture_units::unit_count = 8;
+  int texture_units::units[8] = { 7, 6, 5, 4, 3, 2, 1, 0 };
 
   shader_object_i *cur = 0;
 
@@ -167,91 +111,55 @@
     glDeleteObjectARB (id);
   }
 
-  void shader_object_i::start ()
-  {
-    clear ();
-    cur = this;
-  }
-
-  void shader_object_i::stop ()
-  {
-    cur = 0;
-  }
-
-  string shader_object_i::source ()
+  static string linify (const string &s)
   {
-    shader_builder b;
-    build (b);
-    ostringstream os;
-
-    for (vector<uniform>::iterator i = b.refs.begin (); i != b.refs.end (); i++)
-      {
-        (*i)->build_decl (os);
-        os << ";\n";
-      }
-
-    // not neccessary right now, as GLSL is rich on predefinitions
-    for (vector<var>::iterator i = b.streams.begin (); i != b.streams.end (); i++)
-      {
-        os << "attribute ";
-        (*i)->build_decl (os);
-        os << ";\n";
-      }
+    ostringstream o;
 
-    os << "\nvoid main (void)\n{\n";
+    int b = 0, e;
+    int l = 1;
+    do {
+      o << setw (3) << l << ": ";
+      e = s.find ('\n', b);
+      if (e == string::npos)
+        e = s.size ();
+
+      o << s.substr (b, e - b + 1);
+      b = e + 1;
+      l++;
+    } while (b < s.size ());
 
-    for (vector<var>::iterator i = b.temps.begin (); i != b.temps.end (); i++)
-      {
-        os << "  ";
-        (*i)->build_decl (os);
-        os << ";\n";
-      }
-
-    os << "\n";
-    os << b.source.str ();
-    os << "}\n";
-
-    return os.str ();
+    return o.str ();
   }
 
-  void shader_object_i::compile ()
+  ////////////////////////////////////////////////////////////////////////////
+  
+  GLint uniform_i::location ()
   {
-    string src = source ();
-    const char *sptr = src.data ();
-    const int slen = src.size ();
+    assert (program_object_i::cur);
 
-    printf ("SOURCE<%s>\n", src.c_str ());
-    glShaderSourceARB (id, 1, &sptr, &slen);
-    glCompileShaderARB (id);
+    GLint &rid = program_object_i::cur->uloc[this];
 
-    GLint compiled;
-    glGetObjectParameterivARB (id, GL_OBJECT_COMPILE_STATUS_ARB, &compiled);
+    if (!rid)
+      rid = glGetUniformLocationARB (program_object_i::cur->id, name);
 
-    if (!compiled)
-      {
-        char infolog[8192];
-        glGetInfoLogARB (id, 8192, NULL, infolog);
-        printf ("SOURCE<%s>\n", src.c_str ());
-        printf ("INFOLOG<%s>\n", infolog);
-        abort ();
-      }
+    return rid;
   }
 
-  program_object::program_object ()
+  program_object_i *program_object_i::cur;
+
+  program_object_i::program_object_i ()
   {
     id = glCreateProgramObjectARB ();
     assert (id);
   }
 
-  program_object::~program_object ()
+  program_object_i::~program_object_i ()
   {
     glDeleteProgramsARB (1, &id);
   }
 
-  void program_object::link ()
+  void program_object_i::link ()
   {
-    glAttachObjectARB (id, vsh->id);
-    glAttachObjectARB (id, fsh->id);
     glLinkProgramARB (id);
         
     GLint linked;
@@ -264,121 +172,139 @@
         printf ("LINK-INFOLOG<%s>\n", infolog);
         abort ();
       }
-  }
 
-  void sl_func0::begin () const
-  {
-    cur->append_string (name_par);
+    uloc.clear ();
   }
 
-  void sl_func0::comma () const
+  void program_object_i::enable ()
   {
-    cur->append (str_comma);
+    if (this != cur)
+      {
+        glUseProgramObjectARB (id);
+        //TODO: set samplers here?
+        cur = this;
+      }
   }
 
-  void sl_func0::end () const
+  void program_object_i::disable ()
   {
-    str_rpar ();
+    //TODO: clear samplers here?
+    glUseProgramObjectARB (0);
+    cur = 0;
   }
 
-  void sl_float::operator ()() const
+  static map<string, program_object> progcache;
+
+  program_object get_program (const string &vsh, const string &fsh)
   {
-    char s[20];
-    sprintf (s, "%g", c);
-    cur->append_string (s);
+    string idx = vsh + "\0" + fsh;
+
+    map<string, program_object>::iterator i = progcache.find (idx);
+
+    if (i != progcache.end ())
+      return i->second;
+
+    program_object p;
+
+    if (vsh.size ())
+      {
+        vertex_shader sh;
+        p->attach (sh);
+        sh->compile (vsh);
+      }
+
+    if (fsh.size ())
+      {
+        fragment_shader sh;
+        p->attach (sh);
+        sh->compile (fsh);
+      }
+
+    p->link ();
+
+    progcache.insert (pair<string, program_object> (idx, p));
+
+    return p;
   }
 
-  const sl_convert< ::vec2 >::T sl_convert< ::vec2 >::convert (const ::vec2 &v)
+  const sl_expr< sl_string<60> > sl_convert< ::vec2 >::convert (const ::vec2 &v)
   {
     sl_string<60> s;
-    sprintf (s.str, "vec2 (%g, %g)", v.x, v.y);
+    sprintf (s.str, "vec2 (%e, %e)", v.x, v.y);
     return s;
   }
 
-  const sl_convert< ::vec3 >::T sl_convert< ::vec3 >::convert (const ::vec3 &v)
+  const sl_expr< sl_string<80> > sl_convert< ::vec3 >::convert (const ::vec3 &v)
   {
     sl_string<80> s;
-    sprintf (s.str, "vec3 (%g, %g, %g)", v.x, v.y, v.z);
+    sprintf (s.str, "vec3 (%e, %e, %e)", v.x, v.y, v.z);
     return s;
   }
 
-  const sl_convert< ::vec4 >::T sl_convert< ::vec4 >::convert (const ::vec4 &v)
+  const sl_expr< sl_string<100> > sl_convert< ::vec4 >::convert (const ::vec4 &v)
   {
     sl_string<100> s;
-    sprintf (s.str, "vec4 (%g, %g, %g, %g)", v.x, v.y, v.z, v.w);
+    sprintf (s.str, "vec4 (%e, %e, %e, %e)", v.x, v.y, v.z, v.w);
     return s;
   }
 
-  const fragment_const_string str_2sp    ("  ");
-  const fragment_const_string str_equal  (" = ");
-  const fragment_const_string str_comma  (", ");
-  const fragment_const_string str_endl   (";\n");
+  shader_builder *shader_builder::cur = 0;
 
-  const sl_append_const_string str_plus  (" + "); 
-  const sl_append_const_string str_minus (" - "); 
-  const sl_append_const_string str_mul   (" * "); 
-  const sl_append_const_string str_div   (" / "); 
-  const sl_append_const_string str_mod   (" % "); 
-
-  const sl_append_const_string str_lpar  ("(");
-  const sl_append_const_string str_rpar  (")");
-
-  void swizzle_mask (sl_string<7> &s, int mask)
+  bool shader_builder::first (const void *p)
   {
-    static const char channel[4] = { 'x', 'y', 'z', 'w' };
-
-    char *str = s.str;
-
-    *str++ = ')';
-    *str++ = '.';
-
-    while (mask)
+    if (seen.find (p) == seen.end ())
       {
-        int c = mask % 5;
-        mask /= 5;
-
-        if (c)
-          *str++ = channel[c - 1];
+        seen.insert (p);
+        return true;
       }
 
-    *str++ = 0;
+    return false;
   }
 
-
-  void debdebdebdebug ()//D
+  void shader_builder::start ()
   {
-    vertex_shader vsh;
-
-    vsh->start ();
-
-    temp_4f lightpos;
-    temp_3f wpos;
+    cur = new shader_builder;
+    cur->code << scientific;
+  }
 
-    lightpos = vec4 (10, -10, 0, 1);
-    wpos = xyz (gl.model_view_matrix * vin.vertex);
-    vout.position = gl.model_view_matrix_inverse_transpose * vin.vertex;
-    vout.tex_coord[0] = vin.tex_coord[0];
-    vout.tex_coord[1] = normalize (lightpos - wpos);
-    vout.tex_coord[2] = normalize (wpos);
-    vout.tex_coord[3] = normalize (xyz (gl.model_view_matrix_inverse_transpose) * vin.normal);
-    vout.tex_coord[4] = normalize (xyz (gl.projection_matrix_inverse_transpose) - wpos);
+  string shader_builder::stop ()
+  {
+    ostringstream os;
 
-    vsh->end ();
-    //vsh->compile ();
+    os << cur->global.str ()
+       << "\nvoid main (void)\n"
+       << "{\n"
+       << cur->local.str ()
+       << "\n"
+       << cur->code.str ()
+       << "}\n";
 
-    fragment_shader fsh;
+    delete cur;
+    cur = 0;
 
-    fsh->start ();
+    return os.str ();
+  }
 
-    xyz (fout.frag_color) = noise3 (x (fin.frag_coord) * y (fin.frag_coord));
+  void shader_object_i::compile (const string &source)
+  {
+    const char *sptr = source.data ();
+    const int slen = source.size ();
 
-    temp_1f spec_expon;
-    spec_expon = 200;
+    printf ("%s\n", linify (source).c_str ());
+    glShaderSourceARB (id, 1, &sptr, &slen);
+    glCompileShaderARB (id);
 
-    fsh->end ();
-    fsh->compile ();
+    GLint compiled;
+    glGetObjectParameterivARB (id, GL_OBJECT_COMPILE_STATUS_ARB, &compiled);
 
-    //abort ();
+    if (!compiled)
+      {
+        char infolog[8192];
+        glGetInfoLogARB (id, 8192, NULL, infolog);
+        printf ("%s\n", linify (source).c_str ());
+        printf ("%s\n", infolog);
+        abort ();
+      }
   }
 
 }