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All doubles now GLdoubles (important for GLES later)

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Other general cleanup in prep for porting geometry code involving
circles.
no longer computing a larger circle table when only need half of it


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1192 7f0cb862-5218-0410-a997-914c9d46530a
This commit is contained in:
dcnieho 2012-03-18 10:02:54 +00:00
parent 3e21108d4f
commit c00c3d67a0
1 changed files with 71 additions and 66 deletions
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125
freeglut/freeglut/src/fg_geometry.c
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@ -566,6 +566,7 @@ static void fghSierpinskiSpongeGenerate ( int numLevels, GLdouble offset[3], GLd
/* -- Now the various shapes involving circles -- */
/*
* Compute lookup table of cos and sin values forming a circle
* (or half circle if halfCircle==TRUE)
*
* Notes:
* It is the responsibility of the caller to free these tables
@ -573,25 +574,21 @@ static void fghSierpinskiSpongeGenerate ( int numLevels, GLdouble offset[3], GLd
* The last entry is exactly the same as the first
* The sign of n can be flipped to get the reverse loop
*/
static void fghCircleTable(double **sint,double **cost,const int n)
static void fghCircleTable(GLdouble **sint, GLdouble **cost, const int n, const GLboolean halfCircle)
{
int i;
/* Table size, the sign of n flips the circle direction */
const int size = abs(n);
/* Determine the angle between samples */
const double angle = 2*M_PI/(double)( ( n == 0 ) ? 1 : n );
const GLdouble angle = (halfCircle?1:2)*M_PI/(GLdouble)( ( n == 0 ) ? 1 : n );
/* Allocate memory for n samples, plus duplicate of first entry at the end */
*sint = (double *) calloc(sizeof(double), size+1);
*cost = (double *) calloc(sizeof(double), size+1);
*sint = malloc(sizeof(GLdouble) * (size+1));
*cost = malloc(sizeof(GLdouble) * (size+1));
/* Bail out if memory allocation fails, fgError never returns */
if (!(*sint) || !(*cost))
{
free(*sint);
@ -600,7 +597,6 @@ static void fghCircleTable(double **sint,double **cost,const int n)
}
/* Compute cos and sin around the circle */
(*sint)[0] = 0.0;
(*cost)[0] = 1.0;
@ -610,11 +606,19 @@ static void fghCircleTable(double **sint,double **cost,const int n)
(*cost)[i] = cos(angle*i);
}
/* Last sample is duplicate of the first */
if (halfCircle)
{
(*sint)[size] = 0.0; /* sin PI */
(*cost)[size] = -1.0; /* cos PI */
}
else
{
/* Last sample is duplicate of the first (sin or cos of 2 PI) */
(*sint)[size] = (*sint)[0];
(*cost)[size] = (*cost)[0];
}
}
/* -- INTERNAL DRAWING functions --------------------------------------- */
@ -735,18 +739,18 @@ void FGAPIENTRY glutSolidSphere(GLdouble radius, GLint slices, GLint stacks)
/* Adjust z and radius as stacks are drawn. */
double z0,z1;
double r0,r1;
GLdouble z0,z1;
GLdouble r0,r1;
/* Pre-computed circle */
double *sint1,*cost1;
double *sint2,*cost2;
GLdouble *sint1,*cost1;
GLdouble *sint2,*cost2;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
fghCircleTable(&sint1,&cost1,-slices);
fghCircleTable(&sint2,&cost2,stacks*2);
fghCircleTable(&sint1,&cost1,-slices,FALSE);
fghCircleTable(&sint2,&cost2, stacks,TRUE);
/* The top stack is covered with a triangle fan */
@ -823,18 +827,18 @@ void FGAPIENTRY glutWireSphere(GLdouble radius, GLint slices, GLint stacks)
/* Adjust z and radius as stacks and slices are drawn. */
double r;
double x,y,z;
GLdouble r;
GLdouble x,y,z;
/* Pre-computed circle */
double *sint1,*cost1;
double *sint2,*cost2;
GLdouble *sint1,*cost1;
GLdouble *sint2,*cost2;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
fghCircleTable(&sint1,&cost1,-slices );
fghCircleTable(&sint2,&cost2, stacks*2);
fghCircleTable(&sint1,&cost1,-slices,FALSE);
fghCircleTable(&sint2,&cost2, stacks,TRUE);
/* Draw a line loop for each stack */
@ -868,6 +872,7 @@ void FGAPIENTRY glutWireSphere(GLdouble radius, GLint slices, GLint stacks)
x = cost1[i]*sint2[j];
y = sint1[i]*sint2[j];
z = cost2[j];
printf("j(%i):%1.3f\n",j,z);
glNormal3d(x,y,z);
glVertex3d(x*radius,y*radius,z*radius);
@ -893,24 +898,24 @@ void FGAPIENTRY glutSolidCone( GLdouble base, GLdouble height, GLint slices, GLi
/* Step in z and radius as stacks are drawn. */
double z0,z1;
double r0,r1;
GLdouble z0,z1;
GLdouble r0,r1;
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
const GLdouble zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
const GLdouble rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
/* Scaling factors for vertex normals */
const double cosn = ( height / sqrt ( height * height + base * base ));
const double sinn = ( base / sqrt ( height * height + base * base ));
const GLdouble cosn = ( height / sqrt ( height * height + base * base ));
const GLdouble sinn = ( base / sqrt ( height * height + base * base ));
/* Pre-computed circle */
double *sint,*cost;
GLdouble *sint,*cost;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
fghCircleTable(&sint,&cost,-slices);
fghCircleTable(&sint,&cost,-slices,FALSE);
/* Cover the circular base with a triangle fan... */
@ -980,24 +985,24 @@ void FGAPIENTRY glutWireCone( GLdouble base, GLdouble height, GLint slices, GLin
/* Step in z and radius as stacks are drawn. */
double z = 0.0;
double r = base;
GLdouble z = 0.0;
GLdouble r = base;
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
const GLdouble zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
const GLdouble rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
/* Scaling factors for vertex normals */
const double cosn = ( height / sqrt ( height * height + base * base ));
const double sinn = ( base / sqrt ( height * height + base * base ));
const GLdouble cosn = ( height / sqrt ( height * height + base * base ));
const GLdouble sinn = ( base / sqrt ( height * height + base * base ));
/* Pre-computed circle */
double *sint,*cost;
GLdouble *sint,*cost;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
fghCircleTable(&sint,&cost,-slices);
fghCircleTable(&sint,&cost,-slices,FALSE);
/* Draw the stacks... */
@ -1048,16 +1053,16 @@ void FGAPIENTRY glutSolidCylinder(GLdouble radius, GLdouble height, GLint slices
/* Step in z and radius as stacks are drawn. */
double z0,z1;
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
GLdouble z0,z1;
const GLdouble zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
/* Pre-computed circle */
double *sint,*cost;
GLdouble *sint,*cost;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
fghCircleTable(&sint,&cost,-slices);
fghCircleTable(&sint,&cost,-slices,FALSE);
/* Cover the base and top */
@ -1112,16 +1117,16 @@ void FGAPIENTRY glutWireCylinder(GLdouble radius, GLdouble height, GLint slices,
/* Step in z and radius as stacks are drawn. */
double z = 0.0;
const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
GLdouble z = 0.0;
const GLdouble zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
/* Pre-computed circle */
double *sint,*cost;
GLdouble *sint,*cost;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
fghCircleTable(&sint,&cost,-slices);
fghCircleTable(&sint,&cost,-slices,FALSE);
/* Draw the stacks... */
@ -1167,10 +1172,10 @@ void FGAPIENTRY glutWireCylinder(GLdouble radius, GLdouble height, GLint slices,
*/
void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
{
double iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
double *vertex, *normal;
GLdouble iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
GLdouble *vertex, *normal;
int i, j;
double spsi, cpsi, sphi, cphi ;
GLdouble spsi, cpsi, sphi, cphi ;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
@ -1178,13 +1183,13 @@ void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLi
if ( nRings < 1 ) nRings = 1;
/* Allocate the vertices array */
vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
vertex = (GLdouble *)calloc( sizeof(GLdouble), 3 * nSides * nRings );
normal = (GLdouble *)calloc( sizeof(GLdouble), 3 * nSides * nRings );
glPushMatrix();
dpsi = 2.0 * M_PI / (double)nRings ;
dphi = -2.0 * M_PI / (double)nSides ;
dpsi = 2.0 * M_PI / (GLdouble)nRings ;
dphi = -2.0 * M_PI / (GLdouble)nSides ;
psi = 0.0;
for( j=0; j<nRings; j++ )
@ -1248,10 +1253,10 @@ void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLi
*/
void FGAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
{
double iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
double *vertex, *normal;
GLdouble iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
GLdouble *vertex, *normal;
int i, j;
double spsi, cpsi, sphi, cphi ;
GLdouble spsi, cpsi, sphi, cphi ;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
@ -1263,13 +1268,13 @@ void FGAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GL
nRings ++ ;
/* Allocate the vertices array */
vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
vertex = (GLdouble *)calloc( sizeof(GLdouble), 3 * nSides * nRings );
normal = (GLdouble *)calloc( sizeof(GLdouble), 3 * nSides * nRings );
glPushMatrix();
dpsi = 2.0 * M_PI / (double)(nRings - 1) ;
dphi = -2.0 * M_PI / (double)(nSides - 1) ;
dpsi = 2.0 * M_PI / (GLdouble)(nRings - 1) ;
dphi = -2.0 * M_PI / (GLdouble)(nSides - 1) ;
psi = 0.0;
for( j=0; j<nRings; j++ )