CrystalSpace

Public API Reference

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 "ivideo/shader/shader.h"
00033 
00034 struct iObjectRegistry;
00035 class csShaderVariable;
00036 struct iShaderVariableContext;
00037 struct iStringSet;
00038 struct iDocumentNode;
00039 struct cons;
00040 
00044 class CS_CRYSTALSPACE_EXPORT csShaderExpression 
00045 {
00046 public:
00047   CS_LEAKGUARD_DECLARE (csShaderExpression);
00048 
00049   struct oper_arg 
00050   { 
00051     uint8 type;
00052     
00053     union 
00054     {
00055       float num;
00056       csStringID var;
00057       
00058       // Illegal outside of a cons cell
00059       int oper;
00060       cons * cell;
00061 
00062       // Special internal values
00063       int acc;
00064     };
00065     
00066     csVector4 vec4;
00067   };
00068 
00069   struct oper 
00070   {
00071     uint8 opcode, acc;
00072     oper_arg arg1, arg2;
00073   };
00074 
00075   typedef csArray<oper> oper_array;
00076   typedef csArray<oper_arg> arg_array;
00077 
00078 private:
00079   iObjectRegistry * obj_reg;
00081   csRef<iShaderVarStack> stacks;
00083   csRef<iStringSet> strset;
00085   oper_array opcodes;
00090   int accstack_max;
00096   arg_array accstack;
00097 
00099   bool parse_xml(cons *, iDocumentNode *);
00101   bool parse_xml_atom(oper_arg &, csStringID, const char *, const char *);
00103   bool parse_sexp(cons *, iDocumentNode *);
00106   bool parse_sexp_form(const char *& text, cons *);
00108   bool parse_sexp_atom(const char *& text, cons *);
00110   bool parse_num_atom(const char *& text, oper_arg &);
00111 
00113   bool compile_cons(const cons *, int & acc_top);
00115   bool compile_make_vector(const cons *, int & acc_top, int acc);
00116 
00118   bool eval_const(cons *&);
00119 
00121   bool eval_oper(int oper, oper_arg arg1, oper_arg arg2, oper_arg & output);
00123   bool eval_oper(int oper, oper_arg arg1, oper_arg & output);
00125   bool eval_oper(int oper, oper_arg & output);
00126 
00128   bool eval_add(const oper_arg & arg1, const oper_arg & arg2,
00129         oper_arg & output) const;
00131   bool eval_sub(const oper_arg & arg1, const oper_arg & arg2,
00132         oper_arg & output) const;
00134   bool eval_mul(const oper_arg & arg1, const oper_arg & arg2,
00135         oper_arg & output) const;
00137   bool eval_div(const oper_arg & arg1, const oper_arg & arg2,
00138         oper_arg & output) const;
00139   
00141   bool eval_elt1(const oper_arg & arg1, oper_arg & output) const;
00143   bool eval_elt2(const oper_arg & arg1, oper_arg & output) const;
00145   bool eval_elt3(const oper_arg & arg1, oper_arg & output) const;
00147   bool eval_elt4(const oper_arg & arg1, oper_arg & output) const;
00148 
00150   bool eval_sin(const oper_arg & arg1, oper_arg & output) const;
00152   bool eval_cos(const oper_arg & arg1, oper_arg & output) const;
00154   bool eval_tan(const oper_arg & arg1, oper_arg & output) const;
00155 
00156   bool eval_arcsin(const oper_arg & arg1, oper_arg & output) const;
00157   bool eval_arccos(const oper_arg & arg1, oper_arg & output) const;
00158   bool eval_arctan(const oper_arg & arg1, oper_arg & output) const;
00159 
00160   bool eval_dot(const oper_arg & arg1, const oper_arg & arg2,
00161         oper_arg & output) const;
00162   bool eval_cross(const oper_arg & arg1, const oper_arg & arg2,
00163         oper_arg & output) const;
00164   bool eval_vec_len(const oper_arg & arg1, oper_arg & output) const;
00165   bool eval_normal(const oper_arg & arg1, oper_arg & output) const;
00167   bool eval_floor(const oper_arg & arg1, oper_arg & output) const;
00168 
00169   bool eval_pow(const oper_arg & arg1, const oper_arg & arg2,
00170         oper_arg & output) const;
00171   bool eval_min(const oper_arg & arg1, const oper_arg & arg2,
00172         oper_arg & output) const;
00173   bool eval_max(const oper_arg & arg1, const oper_arg & arg2,
00174         oper_arg & output) const;
00175 
00177   bool eval_time(oper_arg & output) const;
00179   bool eval_frame(oper_arg & output) const;
00180 
00182   bool eval_selt12(const oper_arg & arg1, const oper_arg & arg2,
00183         oper_arg & output) const;
00185   bool eval_selt34(const oper_arg & arg1, const oper_arg & arg2,
00186         oper_arg & output) const;
00188   bool eval_load(const oper_arg & arg1, oper_arg & output) const;
00189 
00191   bool eval_variable(csShaderVariable *, oper_arg & out);
00193   bool eval_argument(const oper_arg &, csShaderVariable *);
00194 
00196   void destruct_cons(cons *) const;
00198   void print_cons(const cons *) const;
00200   void print_ops(const oper_array &) const;
00202   void print_result(const oper_arg &) const;
00203 
00204   /*inline*/static const char * GetTypeName (csStringID id)/* const*/;
00205   /*{
00206     return xmltypes.Request(id);
00207   }*/
00208   static const char* GetOperName (csStringID id);
00209   static csStringID GetCommonTokenOp (const char* token);
00210   static csStringID GetXmlTokenOp (const char* token);
00211   static csStringID GetSexpTokenOp (const char* token);
00212   static csStringID GetXmlType (const char* token);
00213 
00214   csShaderVariable* ResolveVar (csStringID name);
00215 
00216   mutable csString errorMsg;
00217   void ParseError (const char* message, ...) const;
00218   void EvalError (const char* message, ...) const;
00219 public:
00220   csShaderExpression(iObjectRegistry *);
00221   ~csShaderExpression();
00222 
00224   bool Parse(iDocumentNode *);
00226 
00230   bool Evaluate(csShaderVariable *, csShaderVarStack& stacks);
00231   bool Evaluate(csShaderVariable *, iShaderVarStack* stacks);
00233 
00235   const char* GetError() const { return errorMsg; }
00236 };
00237 
00238 #endif

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