tentacle3d.cpp

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#include <algorithm>
#include <cstdlib>
 
#include "v3d.h"
#include "surf3d.h"
#include "goom_core.h"
#include "goom_tools.h"
#include "goomconfig.h"
#include "tentacle3d.h"
 
static constexpr float  D { 256.0F };
 
static constexpr size_t nbgrid      {  6 };
static constexpr int8_t definitionx { 15 };
static constexpr int8_t definitionz { 45 };
 
static float cycle = 0.0F;
static std::array<grid3d *,nbgrid> grille;
static float *vals;
 
void tentacle_free (void) {
        free (vals);
        for (auto & tmp : grille) {
                grid3d_free(&tmp);
        }
}
 
void tentacle_new (void) {
        v3d center = {0,-17.0,0};
        vals = (float*)malloc ((definitionx+20)*sizeof(float));
        
        for (auto & tmp : grille) {
                int z = 45+(goom_rand()%30);
                int x = 85+(goom_rand()%5);
                center.z = z;
                tmp = grid3d_new (x,definitionx,z,definitionz+(goom_rand()%10),center);
                center.y += 8;
        }
}
 
static inline unsigned char
lighten (unsigned char value, float power)
{
        int     val = value;
        float   t = (float) val * log10f(power) / 2.0F;
 
        if (t > 0) {
                val = (int) t; // (32.0F * log (t));
                return std::min(val, 255);
        }
        return 0;
}
 
static void
lightencolor (int *col, float power)
{
        auto *color = (unsigned char *) col;
        *color = lighten (*color, power);
        color++;
        *color = lighten (*color, power);
        color++;
        *color = lighten (*color, power);
        color++;
        *color = lighten (*color, power);
}
 
// retourne x>>s , en testant le signe de x
static inline int ShiftRight(int x,int s) {return (x<0) ? -((-x)>>s) : (x>>s); }
 
static
int evolutecolor (unsigned int src,unsigned int dest, unsigned int mask, unsigned int incr) {
        int color = src & (~mask);
        src &= mask;
        dest &= mask;
 
        if ((src!=mask)
                        &&(src<dest))
                src += incr;
 
        if (src>dest)
                src -= incr;
        return (src&mask)|color;
}
 
static void pretty_move (float lcycle, float *dist,float *dist2, float *rotangle) {
        static float s_distT = 10.0F;
        static float s_distT2 = 0.0F;
        static float s_rot = 0.0F; // entre 0 et 2 * M_PI
        static int s_happens = 0;
        static int s_lock = 0;
 
        if (s_happens)
                s_happens -= 1;
        else if (s_lock == 0) {
                s_happens = iRAND(200)?0:100+iRAND(60);
                s_lock = s_happens * 3 / 2;
        }
        else {
                s_lock --;
        }
//      happens = 1;
        
        float tmp = s_happens?8.0F:0;
        *dist2 = s_distT2 = (tmp + 15.0F*s_distT2)/16.0F;
 
        tmp = 30+D-(90.0F*(1.0F+sinf(lcycle*19/20)));
        if (s_happens)
                tmp *= 0.6F;
 
        *dist = s_distT = (tmp + 3.0F*s_distT)/4.0F;
 
        if (!s_happens){
                tmp = (M_PI_F*sinf(lcycle)/32)+(3*M_PI_F/2);
        }
        else {
                static int s_rotation {0};
                s_rotation = iRAND(500)?s_rotation:iRAND(2);
                if (s_rotation)
                        lcycle *= 2.0F*M_PI_F;
                else
                        lcycle *= -1.0F*M_PI_F;
                tmp = lcycle - ((M_PI_F*2.0F) * floorf(lcycle/(M_PI_F*2.0F)));
        }
        
        if (fabsf(tmp-s_rot) > fabsf(tmp-(s_rot+2.0F*M_PI_F))) {
                s_rot = (tmp + 15.0F*(s_rot+2*M_PI_F)) / 16.0F;
                if (s_rot>2.0F*M_PI_F)
                        s_rot -= 2.0F*M_PI_F;
                *rotangle = s_rot;
        }
        else if (fabsf(tmp-s_rot) > fabsf(tmp-(s_rot-2.0F*M_PI_F))) {
                s_rot = (tmp + 15.0F*(s_rot-2.0F*M_PI_F)) / 16.0F;
                if (s_rot<0.0F)
                        s_rot += 2.0F*M_PI_F;
                *rotangle = s_rot;
        }
        else {
                *rotangle = s_rot = (tmp + 15.0F*s_rot) / 16.0F;
        }
}
 
void tentacle_update(int *buf, int *back, int W, int H, GoomDualData& data, float rapport, int drawit) {
        static std::array<int,3> s_colors {
                (0x18<<(ROUGE*8))|(0x4c<<(VERT*8))|(0x2f<<(BLEU*8)),
                (0x48<<(ROUGE*8))|(0x2c<<(VERT*8))|(0x6f<<(BLEU*8)),
                (0x58<<(ROUGE*8))|(0x3c<<(VERT*8))|(0x0f<<(BLEU*8))};
        
        static float s_lig = 1.15F;
        static float s_ligs = 0.1F;
 
        float dist = NAN;
        float dist2 = NAN;
        float rotangle = NAN;
 
        if ((!drawit) && (s_ligs>0.0F))
                s_ligs = -s_ligs;
 
        s_lig += s_ligs;
 
        if (s_lig > 1.01F) {
                if ((s_lig>10.0F) || (s_lig<1.1F))
                    s_ligs = -s_ligs;
                
                static int s_col = (0x28<<(ROUGE*8))|(0x2c<<(VERT*8))|(0x5f<<(BLEU*8));
                static int s_dstCol = 0;
 
                if ((s_lig<6.3F)&&(iRAND(30)==0))
                        s_dstCol=iRAND(3);
 
                s_col = evolutecolor(s_col,s_colors[s_dstCol],0xff,0x01);
                s_col = evolutecolor(s_col,s_colors[s_dstCol],0xff00,0x0100);
                s_col = evolutecolor(s_col,s_colors[s_dstCol],0xff0000,0x010000);
                s_col = evolutecolor(s_col,s_colors[s_dstCol],0xff000000,0x01000000);
                
                int color = s_col;
                int colorlow = s_col;
                
                lightencolor(&color,(s_lig * 2.0F) + 2.0F);
                lightencolor(&colorlow,(s_lig/3.0F)+0.67F);
 
                rapport = 1.0F + (2.0F * (rapport - 1.0F));
                rapport *= 1.2F;
                rapport = std::min(rapport, 1.12F);
                
                pretty_move (cycle,&dist,&dist2,&rotangle);
 
                for (auto & tmp : grille) {
                        for (int tmp2=0;tmp2<definitionx;tmp2++) {
                                float val = (float)(ShiftRight(data[0][iRAND(511)],10)) * rapport;
                                vals[tmp2] = val;
                        }
                        
                        grid3d_update (tmp,rotangle, vals, dist2);
                }
                cycle+=0.01F;
                for (auto & tmp : grille)
                        grid3d_draw (tmp,color,colorlow,dist,buf,back,W,H);
        }
        else {
                s_lig = 1.05F;
                if (s_ligs < 0.0F)
                        s_ligs = -s_ligs;
                pretty_move (cycle,&dist,&dist2,&rotangle);
                cycle+=0.1F;
                if (cycle > 1000)
                        cycle = 0;
        }
}