csgfx/shaderexp.h

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00001 /*
00002     Copyright (C) 2003 by Andrew Topp <designa@users.sourceforge.net>
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public
00015     License along with this library; if not, write to the Free
00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_GFX_SHADEREXP_H__
00020 #define __CS_GFX_SHADEREXP_H__
00021 
00026 #include "csextern.h"
00027 
00028 #include "csutil/strhash.h"
00029 #include "csutil/array.h"
00030 #include "csutil/leakguard.h"
00031 #include "csgeom/vector4.h"
00032 #include "csgfx/shadervarnameparser.h"
00033 #include "ivideo/shader/shader.h"
00034 
00035 struct iObjectRegistry;
00036 class csShaderVariable;
00037 struct iShaderVariableContext;
00038 struct iStringSet;
00039 struct iDocumentNode;
00040 struct cons;
00041 
00045 class CS_CRYSTALSPACE_EXPORT csShaderExpression 
00046 {
00047 public:
00048   CS_LEAKGUARD_DECLARE (csShaderExpression);
00049 
00050   struct oper_arg 
00051   { 
00052     uint8 type;
00053     
00054     struct SvVarValue
00055     {
00056       CS::StringIDValue id;
00057       size_t* indices;
00058     };
00059     union 
00060     {
00061       float num;
00062       SvVarValue var;
00063       
00064       // Illegal outside of a cons cell
00065       int oper;
00066       cons* cell;
00067 
00068       // Special internal values
00069       int acc;
00070     };
00071     
00072     csVector4 vec4;
00073     CS::Math::Matrix4 matrix;
00074 
00075     uint GetHash() const;
00076   };
00077 
00078   struct oper 
00079   {
00080     uint8 opcode, acc;
00081     oper_arg arg1, arg2, arg3;
00082 
00083     uint GetHash() const;
00084   };
00085 
00086   typedef csArray<oper> oper_array;
00087   typedef csArray<oper_arg> arg_array;
00088 
00089 private:
00090   iObjectRegistry* obj_reg;
00092   csShaderVariableStack* stack;
00094   csRef<iShaderVarStringSet> strset;
00096   csMemoryPool svIndicesScratch;
00098   oper_array opcodes;
00103   int accstack_max;
00109   arg_array accstack;
00110 
00112   bool parse_xml (cons*, iDocumentNode*);
00114   bool parse_xml_atom (oper_arg&, csStringID, const char*, const char*);
00116   bool parse_sexp (cons*, iDocumentNode*);
00119   bool parse_sexp_form (const char*& text, cons*);
00121   bool parse_sexp_atom (const char*& text, cons*);
00123   bool parse_num_atom (const char*& text, oper_arg&);
00124 
00126   bool compile_cons (const cons*, int& acc_top);
00128   bool compile_make_vector (const cons*, int& acc_top, int acc);
00130   bool compile_if (const cons*, int& acc_top, int acc);
00131 
00134 
00135   bool eval_const (cons*&);
00140   bool optimize_cse (oper_array&);
00143 
00144   bool resolve_arg (oper_arg& arg);
00146   bool eval_oper (int oper, oper_arg arg1, oper_arg arg2, oper_arg arg3, oper_arg& output);
00148   bool eval_oper (int oper, oper_arg arg1, oper_arg arg2, oper_arg& output);
00150   bool eval_oper (int oper, oper_arg arg1, oper_arg& output);
00152   bool eval_oper (int oper, oper_arg& output);
00153 
00155   bool eval_add (const oper_arg& arg1, const oper_arg& arg2,
00156         oper_arg& output) const;
00158   bool eval_sub (const oper_arg& arg1, const oper_arg& arg2,
00159         oper_arg& output) const;
00161   bool eval_mul (const oper_arg& arg1, const oper_arg& arg2,
00162         oper_arg& output) const;
00164   bool eval_div (const oper_arg& arg1, const oper_arg& arg2,
00165         oper_arg& output) const;
00166   
00168   bool eval_elt1 (const oper_arg& arg1, oper_arg& output) const;
00170   bool eval_elt2 (const oper_arg& arg1, oper_arg& output) const;
00172   bool eval_elt3 (const oper_arg& arg1, oper_arg& output) const;
00174   bool eval_elt4 (const oper_arg& arg1, oper_arg& output) const;
00175 
00177   bool eval_sin (const oper_arg& arg1, oper_arg& output) const;
00179   bool eval_cos (const oper_arg& arg1, oper_arg& output) const;
00181   bool eval_tan (const oper_arg& arg1, oper_arg& output) const;
00182 
00183   bool eval_arcsin (const oper_arg& arg1, oper_arg& output) const;
00184   bool eval_arccos (const oper_arg& arg1, oper_arg& output) const;
00185   bool eval_arctan (const oper_arg& arg1, oper_arg& output) const;
00186 
00187   bool eval_dot (const oper_arg& arg1, const oper_arg& arg2,
00188         oper_arg& output) const;
00189   bool eval_cross (const oper_arg& arg1, const oper_arg& arg2,
00190         oper_arg& output) const;
00191   bool eval_vec_len (const oper_arg& arg1, oper_arg& output) const;
00192   bool eval_normal (const oper_arg& arg1, oper_arg& output) const;
00194   bool eval_floor (const oper_arg& arg1, oper_arg& output) const;
00195 
00196   bool eval_pow (const oper_arg& arg1, const oper_arg& arg2,
00197         oper_arg& output) const;
00198   bool eval_min (const oper_arg& arg1, const oper_arg& arg2,
00199         oper_arg& output) const;
00200   bool eval_max (const oper_arg& arg1, const oper_arg& arg2,
00201         oper_arg& output) const;
00202 
00204   bool eval_time (oper_arg& output) const;
00206   bool eval_frame (oper_arg& output) const;
00207 
00208   template<typename Comparator>
00209   bool eval_compare (const Comparator& cmp, const oper_arg& arg1,
00210     const oper_arg& arg2, oper_arg& output) const;
00211     
00213   bool eval_and (const oper_arg& arg1, const oper_arg& arg2,
00214         oper_arg& output) const;
00216   bool eval_or (const oper_arg& arg1, const oper_arg& arg2,
00217         oper_arg& output) const;
00219   bool eval_not (const oper_arg& arg, oper_arg& output) const;
00220         
00221   bool eval_matrix_column (const oper_arg& arg1, const oper_arg& arg2,
00222         oper_arg& output) const;
00223   bool eval_matrix_row (const oper_arg& arg1, const oper_arg& arg2,
00224         oper_arg& output) const;
00225   bool eval_matrix2gl (const oper_arg& arg1, oper_arg& output) const;
00226   bool eval_matrix_transp (const oper_arg& arg1, oper_arg& output) const;
00227   bool eval_matrix_inv (const oper_arg& arg1, oper_arg& output) const;
00228         
00230   bool eval_selt12 (const oper_arg& arg1, const oper_arg& arg2,
00231         oper_arg & output) const;
00233   bool eval_selt3 (const oper_arg & arg1, const oper_arg & arg2,
00234     oper_arg& output) const;
00236   bool eval_selt34 (const oper_arg & arg1, const oper_arg & arg2,
00237         const oper_arg & arg3, oper_arg& output) const;
00239   bool eval_load (const oper_arg& arg1, oper_arg& output) const;
00241   bool eval_select (const oper_arg& arg1, const oper_arg& arg2,
00242     const oper_arg& arg3, oper_arg& output) const;
00243 
00245   bool eval_variable (csShaderVariable*, oper_arg& out);
00247   bool eval_argument (const oper_arg&, csShaderVariable*);
00248 
00250   void destruct_cons (cons*) const;
00252   void print_cons (const cons*) const;
00254   void print_ops (const oper_array&) const;
00256   const char* oper_arg_str (const oper_arg&) const;
00258   void print_result (const oper_arg&) const;
00259 
00260   /*inline*/static const char* GetTypeName (unsigned int id)/* const*/;
00261   /*{
00262     return xmltypes.Request(id);
00263   }*/
00264   static const char* GetOperName (unsigned int id);
00265   static csStringID GetCommonTokenOp (const char* token);
00266   static csStringID GetXmlTokenOp (const char* token);
00267   static csStringID GetSexpTokenOp (const char* token);
00268   static csStringID GetXmlType (const char* token);
00269 
00271   size_t* AllocSVIndices (const CS::Graphics::ShaderVarNameParser& parser);
00272   csShaderVariable* ResolveVar (const oper_arg::SvVarValue& var);
00273 
00274   mutable csString errorMsg;
00275   void ParseError (const char* message, ...) const;
00276   void EvalError (const char* message, ...) const;
00277 
00278   mutable csString* tmpOperArgStr;
00279 public:
00280   csShaderExpression (iObjectRegistry*);
00281   ~csShaderExpression ();
00282 
00284   bool Parse (iDocumentNode*);
00286 
00290   bool Evaluate (csShaderVariable*, csShaderVariableStack& stacks);
00292 
00294   const char* GetError () const { return errorMsg; }
00295 };
00296 
00297 #endif
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	Public API Reference
Public API Reference

csgfx/shaderexp.h
