mirror of
https://github.com/clementine-player/Clementine
synced 2024-12-24 16:51:59 +01:00
376 lines
8.2 KiB
C++
Executable File
376 lines
8.2 KiB
C++
Executable File
/**
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* projectM -- Milkdrop-esque visualisation SDK
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* Copyright (C)2003-2004 projectM Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* See 'LICENSE.txt' included within this release
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*
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*/
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#include "wipemalloc.h"
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#include "Expr.hpp"
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#include <cassert>
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#include <iostream>
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#include "Eval.hpp"
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float GenExpr::eval_gen_expr ( int mesh_i, int mesh_j )
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{
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float l;
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assert ( item );
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switch ( this->type )
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{
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case VAL_T:
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return ( ( ValExpr* ) item )->eval_val_expr ( mesh_i, mesh_j );
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case PREFUN_T:
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l = ( ( PrefunExpr * ) item )->eval_prefun_expr ( mesh_i, mesh_j );
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//if (EVAL_DEBUG) DWRITE( "eval_gen_expr: prefix function return value: %f\n", l);
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return l;
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case TREE_T:
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return ( ( TreeExpr* ) ( item ) )->eval_tree_expr ( mesh_i, mesh_j );
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default:
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return EVAL_ERROR;
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}
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}
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/* Evaluates functions in prefix form */
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float PrefunExpr::eval_prefun_expr ( int mesh_i, int mesh_j )
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{
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assert ( func_ptr );
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float * arg_list = new float[this->num_args];
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assert(arg_list);
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//printf("numargs %d", num_args);
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/* Evaluate each argument before calling the function itself */
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for ( int i = 0; i < num_args; i++ )
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{
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arg_list[i] = expr_list[i]->eval_gen_expr ( mesh_i, mesh_j );
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//printf("numargs %x", arg_list[i]);
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}
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/* Now we call the function, passing a list of
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floats as its argument */
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const float value = ( func_ptr ) ( arg_list );
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delete[](arg_list);
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return value;
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}
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/* Evaluates a value expression */
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float ValExpr::eval_val_expr ( int mesh_i, int mesh_j )
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{
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/* Value is a constant, return the float value */
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if ( type == CONSTANT_TERM_T )
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{
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return ( term.constant );
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}
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/* Value is variable, dereference it */
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if ( type == PARAM_TERM_T )
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{
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switch ( term.param->type )
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{
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case P_TYPE_BOOL:
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return ( float ) ( * ( ( bool* ) ( term.param->engine_val ) ) );
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case P_TYPE_INT:
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return ( float ) ( * ( ( int* ) ( term.param->engine_val ) ) );
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case P_TYPE_DOUBLE:
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if ( term.param->matrix_flag | ( term.param->flags & P_FLAG_ALWAYS_MATRIX ) )
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{
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/* Sanity check the matrix is there... */
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assert ( term.param->matrix != NULL );
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/// @slow boolean check could be expensive in this critical (and common) step of evaluation
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if ( mesh_i >= 0 )
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{
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if ( mesh_j >= 0 )
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{
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return ( ( ( float** ) term.param->matrix ) [mesh_i][mesh_j] );
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}
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else
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{
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return ( ( ( float* ) term.param->matrix ) [mesh_i] );
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}
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}
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//assert(mesh_i >=0);
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}
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//std::cout << term.param->name << ": " << (*((float*)term.param->engine_val)) << std::endl;
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return * ( ( float* ) ( term.param->engine_val ) );
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default:
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return EVAL_ERROR;
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}
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}
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/* Unknown type, return failure */
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return PROJECTM_FAILURE;
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}
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/* Evaluates an expression tree */
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float TreeExpr::eval_tree_expr ( int mesh_i, int mesh_j )
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{
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float left_arg, right_arg;
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/* A leaf node, evaluate the general expression. If the expression is null as well, return zero */
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if ( infix_op == NULL )
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{
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if ( gen_expr == NULL )
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return 0;
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else
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return gen_expr->eval_gen_expr ( mesh_i, mesh_j );
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}
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/* Otherwise, this node is an infix operator. Evaluate
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accordingly */
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assert(left);
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left_arg = left->eval_tree_expr ( mesh_i, mesh_j );
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assert(right);
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right_arg = right->eval_tree_expr ( mesh_i, mesh_j );
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switch ( infix_op->type )
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{
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case INFIX_ADD:
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return ( left_arg + right_arg );
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case INFIX_MINUS:
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return ( left_arg - right_arg );
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case INFIX_MULT:
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return ( left_arg * right_arg );
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case INFIX_MOD:
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if ( ( int ) right_arg == 0 )
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{
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return PROJECTM_DIV_BY_ZERO;
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}
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return ( ( int ) left_arg % ( int ) right_arg );
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case INFIX_OR:
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return ( ( int ) left_arg | ( int ) right_arg );
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case INFIX_AND:
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return ( ( int ) left_arg & ( int ) right_arg );
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case INFIX_DIV:
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if ( right_arg == 0 )
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{
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return MAX_DOUBLE_SIZE;
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}
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return ( left_arg / right_arg );
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default:
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return EVAL_ERROR;
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}
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return EVAL_ERROR;
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}
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/* Converts a float value to a general expression */
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GenExpr * GenExpr::const_to_expr ( float val )
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{
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GenExpr * gen_expr;
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ValExpr * val_expr;
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Term term;
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term.constant = val;
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if ( ( val_expr = new ValExpr ( CONSTANT_TERM_T, &term ) ) == NULL )
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return NULL;
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gen_expr = new GenExpr ( VAL_T, ( void* ) val_expr );
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if ( gen_expr == NULL )
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{
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delete val_expr;
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}
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return gen_expr;
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}
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/* Converts a regular parameter to an expression */
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GenExpr * GenExpr::param_to_expr ( Param * param )
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{
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GenExpr * gen_expr = NULL;
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ValExpr * val_expr = NULL;
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Term term;
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if ( param == NULL )
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return NULL;
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/* This code is still a work in progress. We need
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to figure out if the initial condition is used for
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each per frame equation or not. I am guessing that
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it isn't, and it is thusly implemented this way */
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/* Current guess of true behavior (08/01/03) note from carm
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First try to use the per_pixel_expr (with cloning)
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If it is null however, use the engine variable instead. */
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/* 08/20/03 : Presets are now objects, as well as per pixel equations. This ends up
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making the parser handle the case where parameters are essentially per pixel equation
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substitutions */
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term.param = param;
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if ( ( val_expr = new ValExpr ( PARAM_TERM_T, &term ) ) == NULL )
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return NULL;
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if ( ( gen_expr = new GenExpr ( VAL_T, ( void* ) val_expr ) ) == NULL )
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{
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delete val_expr;
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return NULL;
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}
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return gen_expr;
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}
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/* Converts a prefix function to an expression */
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GenExpr * GenExpr::prefun_to_expr ( float ( *func_ptr ) ( void * ), GenExpr ** expr_list, int num_args )
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{
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GenExpr * gen_expr;
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PrefunExpr * prefun_expr;
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prefun_expr = new PrefunExpr();
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if ( prefun_expr == NULL )
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return NULL;
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prefun_expr->num_args = num_args;
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prefun_expr->func_ptr = ( float ( * ) ( void* ) ) func_ptr;
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prefun_expr->expr_list = expr_list;
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gen_expr = new GenExpr ( PREFUN_T, ( void* ) prefun_expr );
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if ( gen_expr == NULL )
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delete prefun_expr;
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return gen_expr;
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}
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/* Creates a new tree expression */
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TreeExpr::TreeExpr ( InfixOp * _infix_op, GenExpr * _gen_expr, TreeExpr * _left, TreeExpr * _right ) :
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infix_op ( _infix_op ), gen_expr ( _gen_expr ),
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left ( _left ), right ( _right ) {}
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/* Creates a new value expression */
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ValExpr::ValExpr ( int _type, Term * _term ) :type ( _type )
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{
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//val_expr->type = _type;
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term.constant = _term->constant;
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term.param = _term->param;
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//return val_expr;
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}
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/* Creates a new general expression */
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GenExpr::GenExpr ( int _type, void * _item ) :type ( _type ), item ( _item ) {}
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/* Frees a general expression */
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GenExpr::~GenExpr()
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{
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switch ( type )
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{
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case VAL_T:
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delete ( ( ValExpr* ) item );
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break;
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case PREFUN_T:
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delete ( ( PrefunExpr* ) item );
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break;
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case TREE_T:
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delete ( ( TreeExpr* ) item );
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break;
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}
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}
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/* Frees a function in prefix notation */
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PrefunExpr::~PrefunExpr()
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{
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int i;
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/* Free every element in expression list */
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for ( i = 0 ; i < num_args; i++ )
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{
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delete expr_list[i];
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}
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free ( expr_list );
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}
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/* Frees values of type VARIABLE and CONSTANT */
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ValExpr::~ValExpr()
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{}
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/* Frees a tree expression */
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TreeExpr::~TreeExpr()
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{
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/* free left tree */
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if ( left != NULL )
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{
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delete left;
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}
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/* free general expression object */
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if ( gen_expr != NULL )
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{
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delete gen_expr;
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}
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/* Note that infix operators are always
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stored in memory unless the program
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exits, so we don't remove them here */
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/* free right tree */
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if ( right != NULL )
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{
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delete right;
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}
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}
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/* Initializes an infix operator */
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InfixOp::InfixOp ( int type, int precedence )
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{
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this->type = type;
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this->precedence = precedence;
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}
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PrefunExpr::PrefunExpr() {}
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