lines.c

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/*
 *  lines.c
 */

#include "lines.h"
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include "goom_tools.h"
#include "drawmethods.h"

extern unsigned int resolx, c_resoly;

static inline unsigned char
lighten (unsigned char value, float power)
{
        int     val = value;
        float   t = (float) val * log10(power) / 2.0;

        if (t > 0) {
                val = (int) t; // (32.0f * log (t));
                if (val > 255)
                        val = 255;
                if (val < 0)
                        val = 0;
                return val;
        }
        else {
                return 0;
        }
}

static void
lightencolor (int *col, float power)
{
        unsigned char *color;

        color = (unsigned char *) col;
        *color = lighten (*color, power);
        color++;
        *color = lighten (*color, power);
        color++;
        *color = lighten (*color, power);
        color++;
        *color = lighten (*color, power);
}

static void
genline (int id, float param, GMUnitPointer * l, int rx, int ry)
{
        int     i;

        switch (id) {
        case GML_HLINE:
                for (i = 0; i < 512; i++) {
                        l[i].x = ((float) i * rx) / 512.0f;
                        l[i].y = param;
                        l[i].angle = M_PI / 2.0f;
                }
                return;
        case GML_VLINE:
                for (i = 0; i < 512; i++) {
                        l[i].y = ((float) i * ry) / 512.0f;
                        l[i].x = param;
                        l[i].angle = 0.0f;
                }
                return;
        case GML_CIRCLE:
                for (i = 0; i < 512; i++) {
                        float   cosa, sina;

                        l[i].angle = 2.0f * M_PI * (float) i / 512.0f;
                        cosa = param * cos (l[i].angle);
                        sina = param * sin (l[i].angle);
                        l[i].x = ((float) rx / 2.0f) + cosa;
                        l[i].y = (float) ry / 2.0f + sina;
                }
                return;
        }
}

static guint32 getcouleur (int mode)
{
        switch (mode) {
        case GML_RED:
                return (230 << (ROUGE * 8)) | (120 << (VERT * 8)) | (10 << (BLEU * 8));
        case GML_ORANGE_J:
                return (120 << (VERT * 8)) | (252 << (ROUGE * 8)) | (10 << (BLEU * 8));
        case GML_ORANGE_V:
                return (160 << (VERT * 8)) | (236 << (ROUGE * 8)) | (40 << (BLEU * 8));
        case GML_BLEUBLANC:
                return (40 << (BLEU * 8)) | (220 << (ROUGE * 8)) | (140 << (VERT * 8));
        case GML_VERT:
                return (200 << (VERT * 8)) | (80 << (ROUGE * 8)) | (10 << (BLEU * 8));
        case GML_BLEU:
                return (250 << (BLEU * 8)) | (30 << (VERT * 8)) | (80 << (ROUGE * 8));
        case GML_BLACK:
                return 0x5 << (BLEU * 8);
        }
        return 0;
}

void
goom_lines_set_res (GMLine * gml, int rx, int ry)
{
        if (gml != NULL) {
                //int     i;

                gml->screenX = rx;
                gml->screenY = ry;

                genline (gml->IDdest, gml->param, gml->points2, rx, ry);
        }
}


static void
goom_lines_move (GMLine * l)
{
        int     i;
        unsigned char *c1, *c2;

        for (i = 0; i < 512; i++) {
                l->points[i].x = (l->points2[i].x + 39.0f * l->points[i].x) / 40.0f;
                l->points[i].y = (l->points2[i].y + 39.0f * l->points[i].y) / 40.0f;
                l->points[i].angle =
                        (l->points2[i].angle + 39.0f * l->points[i].angle) / 40.0f;
        }

        c1 = (unsigned char *) &l->color;
        c2 = (unsigned char *) &l->color2;
        for (i = 0; i < 4; i++) {
                int     cc1, cc2;

                cc1 = *c1;
                cc2 = *c2;
                *c1 = (unsigned char) ((cc1 * 63 + cc2) >> 6);
                ++c1;
                ++c2;
        }

        l->power += l->powinc;
        if (l->power < 1.1f) {
                l->power = 1.1f;
                l->powinc = (float) (iRAND (20) + 10) / 300.0f;
        }
        if (l->power > 17.5f) {
                l->power = 17.5f;
                l->powinc = -(float) (iRAND (20) + 10) / 300.0f;
        }

        l->amplitude = (99.0f * l->amplitude + l->amplitudeF) / 100.0f;
}

void
goom_lines_switch_to (GMLine * gml, int IDdest,
                                                                                        float param, float amplitude, int col)
{
        genline (IDdest, param, gml->points2, gml->screenX, gml->screenY);
        gml->IDdest = IDdest;
        gml->param = param;
        gml->amplitudeF = amplitude;
        gml->color2 = getcouleur (col);
//  printf ("couleur %d : %x\n",col,gml->color2);
}

GMLine *
goom_lines_init (int rx, int ry,
                                                                 int IDsrc, float paramS, int coulS,
                                                                 int IDdest, float paramD, int coulD)
{
        //int     i;
        //unsigned char *color;
        //unsigned char power = 4;

        GMLine *l = (GMLine *) malloc (sizeof (GMLine));

        l->points = (GMUnitPointer *) malloc (512 * sizeof (GMUnitPointer));
        l->points2 = (GMUnitPointer *) malloc (512 * sizeof (GMUnitPointer));
        l->nbPoints = 512;

        l->IDdest = IDdest;
        l->param = paramD;
        
        l->amplitude = l->amplitudeF = 1.0f;

        genline (IDsrc, paramS, l->points, rx, ry);
        genline (IDdest, paramD, l->points2, rx, ry);

        l->color = getcouleur (coulS);
        l->color2 = getcouleur (coulD);

        l->screenX = rx;
        l->screenY = ry;

        l->power = 0.0f;
        l->powinc = 0.01f;

        goom_lines_switch_to (l, IDdest, paramD, 1.0f, coulD);

        return l;
}

void
goom_lines_free (GMLine ** l)
{
        free ((*l)->points);
        free ((*l)->points2);
        free (*l);
        l = NULL;
}

void
goom_lines_draw (GMLine * line, gint16 data[512], unsigned int *p)
{
        if (line != NULL) {
                int     i, x1, y1;
                guint32 color = line->color;
                GMUnitPointer *pt = &(line->points[0]);

                float   cosa = cos (pt->angle) / 1000.0f;
                float   sina = sin (pt->angle) / 1000.0f;

                lightencolor ((int *)&color, line->power);

                x1 = (int) (pt->x + cosa * line->amplitude * data[0]);
                y1 = (int) (pt->y + sina * line->amplitude * data[0]);

                for (i = 1; i < 512; i++) {
                        int     x2, y2;
                        GMUnitPointer *pt = &(line->points[i]);

                        float   cosa = cos (pt->angle) / 1000.0f;
                        float   sina = sin (pt->angle) / 1000.0f;

                        x2 = (int) (pt->x + cosa * line->amplitude * data[i]);
                        y2 = (int) (pt->y + sina * line->amplitude * data[i]);

                        draw_line ((int *)p, x1, y1, x2, y2, color, line->screenX, line->screenY);
                        DRAWMETHOD_DONE ();

                        x1 = x2;
                        y1 = y2;
                }
                goom_lines_move (line);
        }
}

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