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/* $Id: ml_glutess.c,v 1.7 2008-02-25 01:52:20 garrigue Exp $ */
/* Code contributed by Jon Harrop */
#include <stdio.h>
#include <stdlib.h>
#ifdef _WIN32
#include <wtypes.h>
#endif
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
#include <caml/mlvalues.h>
#include <caml/callback.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include "gl_tags.h"
#include "glu_tags.h"
#include "ml_gl.h"
#include "ml_glu.h"
#ifndef GLU_VERSION_1_2
#define ML_fail(cname) \
CAMLprim value ml_##cname (value any) \
{ ml_raise_gl ("Function not available: "#cname); }
ML_fail (gluTesselate)
ML_fail (gluTesselateAndReturn)
#else
/* Apparently this is used under Windows, according to the Red Book. */
#ifndef CALLBACK
#define CALLBACK
#endif
#define AS_CB (GLvoid(CALLBACK *)())
static void CALLBACK errorCallback(GLenum error)
{
ml_raise_gl((char*)gluErrorString(error));
}
typedef struct chunklist
{
struct chunklist *next;
int current;
int size;
GLdouble data[32][3];
} chunklist;
static chunklist *rootchunk=NULL;
static GLdouble *new_vertex(GLdouble x, GLdouble y, GLdouble z)
{
GLdouble *vert;
if (rootchunk == NULL || rootchunk->current >= rootchunk->size) {
chunklist *tmp = rootchunk;
rootchunk = (chunklist*)malloc(sizeof(chunklist));
rootchunk->next = tmp;
rootchunk->current = 0;
rootchunk->size = 32;
}
vert = rootchunk->data[rootchunk->current++];
vert[0] = x;
vert[1] = y;
vert[2] = z;
return vert;
}
static void free_chunks()
{
while (rootchunk != NULL) {
chunklist *next = rootchunk->next;
free(rootchunk);
rootchunk = next;
}
}
static void CALLBACK combineCallback(GLdouble coords[3],
GLdouble *vertex_data[4],
GLfloat weight[4],
GLdouble **data)
{
*data = new_vertex(coords[0],coords[1],coords[2]);
}
/* prim is only valid during callbacks */
static value *prim;
static int kind = 0;
static void push_vert(value root, double x, double y, double z)
{
CAMLparam1(root);
CAMLlocal4(vert, xx, yy, zz);
value cons;
xx = copy_double(x); yy = copy_double(y); zz = copy_double(z);
vert = alloc_tuple(3);
Field(vert,0) = xx;
Field(vert,1) = yy;
Field(vert,2) = zz;
cons = alloc_tuple(2);
Field(cons, 0) = vert;
Field(cons, 1) = Field(root,0);
modify(&Field(root,0), cons);
CAMLreturn0;
}
static void push_list()
{
value cons = alloc_tuple(2);
Field(cons,0) = Val_unit;
Field(cons,1) = Field(*prim,kind);
modify(&Field(*prim,kind), cons);
}
static void CALLBACK beginCallback(GLenum type)
{
switch (type)
{
case GL_TRIANGLES : kind = 0; break;
case GL_TRIANGLE_FAN : kind = 1; break;
case GL_TRIANGLE_STRIP : kind = 2; break;
default: {
char msg[80];
sprintf(msg, "Unknown primitive format %d in tesselation.\n", (int)type);
ml_raise_gl(msg);
}
}
push_list();
}
static void CALLBACK vertexCallback(void *vertex_data)
{
GLdouble *verts=(GLdouble *)vertex_data;
push_vert(Field(*prim,kind), verts[0], verts[1], verts[2]);
}
static void CALLBACK endCallback()
{
kind = 0;
}
static GLUtesselator *tobj=NULL;
static void iniTesselator(value winding, value by_only, value tolerance)
{
if (!tobj) {
tobj=gluNewTess();
if (!tobj) ml_raise_gl("Failed to initialise the GLU tesselator.");
}
gluTessNormal(tobj, 0.0, 0.0, 1.0);
gluTessProperty(tobj, GLU_TESS_WINDING_RULE,
(winding != Val_unit ? GLUenum_val(Field(winding,0))
: GLU_TESS_WINDING_ODD));
gluTessProperty(tobj, GLU_TESS_BOUNDARY_ONLY,
(by_only != Val_unit && Field(by_only,0) != Val_unit));
gluTessProperty(tobj, GLU_TESS_TOLERANCE,
(tolerance != Val_unit ? Float_val(Field(by_only,0)) : 0));
}
static void runTesselator(value contours)
{
CAMLparam1(contours);
gluTessBeginPolygon(tobj, NULL);
while (contours != Val_int(0)) {
value contour=Field(contours, 0);
gluTessBeginContour(tobj);
while (contour != Val_int(0)) {
value v=Field(contour, 0);
GLdouble *r =
new_vertex(Double_val(Field(v, 0)),
Double_val(Field(v, 1)),
Double_val(Field(v, 2)));
gluTessVertex(tobj, r, (void *)r);
contour = Field(contour, 1);
}
contours = Field(contours, 1);
gluTessEndContour(tobj);
}
gluTessEndPolygon(tobj);
gluDeleteTess(tobj);
tobj = NULL;
free_chunks();
CAMLreturn0;
}
CAMLprim value ml_gluTesselateAndReturn(value winding, value tolerance,
value contours)
{
CAMLparam1(contours);
CAMLlocal1(res);
res = alloc_tuple(3);
Field(res,0) = Field(res,1) = Field(res,2) = Val_unit;
prim = &res;
iniTesselator(winding, Val_unit, tolerance);
gluTessCallback(tobj, GLU_TESS_BEGIN, AS_CB beginCallback);
gluTessCallback(tobj, GLU_TESS_VERTEX, AS_CB vertexCallback);
gluTessCallback(tobj, GLU_TESS_END, AS_CB endCallback);
gluTessCallback(tobj, GLU_TESS_ERROR, AS_CB errorCallback);
gluTessCallback(tobj, GLU_TESS_COMBINE, AS_CB combineCallback);
runTesselator(contours);
CAMLreturn (res);
}
CAMLprim value ml_gluTesselate (value winding, value by_only,
value tolerance, value contours)
{
iniTesselator(winding, by_only, tolerance);
gluTessCallback(tobj, GLU_TESS_BEGIN, AS_CB glBegin);
gluTessCallback(tobj, GLU_TESS_VERTEX, AS_CB glVertex3dv);
gluTessCallback(tobj, GLU_TESS_END, AS_CB glEnd);
gluTessCallback(tobj, GLU_TESS_ERROR, AS_CB errorCallback);
gluTessCallback(tobj, GLU_TESS_COMBINE, AS_CB combineCallback);
runTesselator(contours);
return Val_unit;
}
#endif
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