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test experimental perspective correction feature

This commit is contained in:
Milang 2019-08-16 17:35:32 +02:00
parent 9f401b35b8
commit 1cce870987
1 changed files with 9 additions and 34 deletions
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43
src/FxEngine/face.c
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@ -95,14 +95,6 @@ void FE_draw_face(FE_face const * face)
const int fact_1=(10000*yAC)/diviseur_commun, fact_2=(10000*xAC)/diviseur_commun;
const int fact_3=(10000*xAB)/diviseur_commun, fact_4=(10000*yAB)/diviseur_commun;
const int r_xAB=face->s2->rotated.x-face->s1->rotated.x, r_yAB=face->s2->rotated.y-face->s1->rotated.y;
const int r_xAC=face->s3->rotated.x-face->s1->rotated.x, r_yAC=face->s3->rotated.y-face->s1->rotated.y;
const int r_diviseur_commun=(r_xAB*r_yAC-r_yAB*r_xAC);
const int r_fact_1=(10000*r_yAC)/r_diviseur_commun, r_fact_2=(10000*r_xAC)/r_diviseur_commun;
const int r_fact_3=(10000*r_xAB)/r_diviseur_commun, r_fact_4=(10000*r_yAB)/r_diviseur_commun;
for (int y=ymin; y<=ymax; y++)
{
// détermination du xmin et du xmax de la ligne
@ -115,37 +107,20 @@ void FE_draw_face(FE_face const * face)
for (int x=txmin; x<=txmax; x++)
{
int xcalc,ycalc,vx,vy,vz,z,rx,ry;
// initialisation des variables temporaires au calcul de vx, vy
xcalc=x-face->s1->translated.x;
ycalc=y-face->s1->translated.y;
// calcul de vx,vy, et vz sans la déformation
double vx, vy, z;
// calcul de vx, vy
vx=(xcalc*fact_1-ycalc*fact_2); // 0 <vx< 10_000
vy=(ycalc*fact_3-xcalc*fact_4); // idem
z=face->s1->translated.z + (vx*zAB+vy*zAC)/10000;
vx/=10000;
vy/=10000;
vz=face->s1->translated.z + (vx*zAB+vy*zAC)/10000;
// transformation
rx=x-63; // on determine le centre de l'écran comme le point X(63,31)
ry=y-31;
rx*=vz; // on annule la perspective
ry*=vz;
// deuxieme processus de calcul (avec déformation)
xcalc=rx-face->s1->rotated.x;
ycalc=ry-face->s1->rotated.y;
vx=(xcalc*r_fact_1-ycalc*r_fact_2);
vy=(ycalc*r_fact_3-xcalc*r_fact_4);
z=face->s1->translated.z + (vx*zAB+vy*zAC)/10000;
vx /= (double)face->s2->translated.z / ((1-vx) / face->s1->translated.z + vx / (double)face->s2->translated.z);
vy /= (double)face->s3->translated.z / ((1-vy) / face->s1->translated.z + vy / (double)face->s3->translated.z);
// Affichage du point
if (FE_zbuffer_set_dist(x,y,z))
dpixel(x, y, 3*FE_get_pixel(face->texturenum,vx/1250,vy/1250)); // 3* means cast to black and white, and vx,and vy casted between 0 and 7
dpixel(x, y, 3*FE_get_pixel(face->texturenum, 8*vx, 8*vy)); // 3* means cast to black and white, and vx,and vy casted between 0 and 7
}
}