X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Ffg_geometry.c;h=c74cac4837f66bad264d69ce7ea1ba76935c8bac;hb=ee7bbd68f288bee1bf90734568422cb15cb7723e;hp=a1d683df490d3a9f075af0b0c0503d0619ae64ae;hpb=acdc3f42c8e4ffb6d9a9296ff8391e8338432a93;p=freeglut diff --git a/src/fg_geometry.c b/src/fg_geometry.c index a1d683d..c74cac4 100644 --- a/src/fg_geometry.c +++ b/src/fg_geometry.c @@ -29,140 +29,449 @@ #include "fg_internal.h" /* - * TODO BEFORE THE STABLE RELEASE: - * - * See fghTetrahedron - * - * Following functions have been contributed by Andreas Umbach. - * - * glutWireCube() -- looks OK - * glutSolidCube() -- OK - * - * Those functions have been implemented by John Fay. - * - * glutWireTorus() -- looks OK - * glutSolidTorus() -- looks OK - * glutWireDodecahedron() -- looks OK - * glutSolidDodecahedron() -- looks OK - * glutWireOctahedron() -- looks OK - * glutSolidOctahedron() -- looks OK - * glutWireTetrahedron() -- looks OK - * glutSolidTetrahedron() -- looks OK - * glutWireIcosahedron() -- looks OK - * glutSolidIcosahedron() -- looks OK - * - * The Following functions have been updated by Nigel Stewart, based - * on FreeGLUT 2.0.0 implementations: - * - * glutWireSphere() -- looks OK - * glutSolidSphere() -- looks OK - * glutWireCone() -- looks OK - * glutSolidCone() -- looks OK + * Need more types of polyhedra? See CPolyhedron in MRPT */ -/* General function for drawing geometry. As for all geometry we have no - * redundancy (or hardly any in the case of cones and cylinders) in terms - * of the vertex/normal combinations, we just use glDrawArrays. - * useWireMode controls the drawing of solids (false) or wire frame - * versions (TRUE) of the geometry you pass +/* General functions for drawing geometry + * Solids are drawn by glDrawArrays if composed of triangles, or by + * glDrawElements if consisting of squares or pentagons that were + * decomposed into triangles (some vertices are repeated in that case). + * WireFrame drawing will have to be done per face, using GL_LINE_LOOP and + * issuing one draw call per face. Always use glDrawArrays as no triangle + * decomposition needed. We use the "first" parameter in glDrawArrays to go + * from face to face. */ -static void fghDrawGeometry(GLenum vertexMode, double* vertices, double* normals, GLsizei numVertices, GLboolean useWireMode) +static void fghDrawGeometryWire(GLdouble *vertices, GLdouble *normals, GLsizei numFaces, GLsizei numEdgePerFace) { - if (useWireMode) - { - glPushAttrib(GL_POLYGON_BIT); - glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); - } + int i; + + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_NORMAL_ARRAY); + glVertexPointer(3, GL_DOUBLE, 0, vertices); + glNormalPointer(GL_DOUBLE, 0, normals); + + /* Draw per face (TODO: could use glMultiDrawArrays if available) */ + for (i=0; i 0 ) { GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */ - unsigned int stride = ipow(4,--numLevels)*TETR_VERT_ELEM_PER_TETR; + unsigned int stride = ipow(4,--numLevels)*TETRAHEDRON_VERT_ELEM_PER_OBJ; scale /= 2.0 ; - for ( i = 0 ; i < TETR_NUM_FACES ; i++ ) + for ( i = 0 ; i < TETRAHEDRON_NUM_FACES ; i++ ) { - local_offset[0] = offset[0] + scale * tet_r[i][0]; - local_offset[1] = offset[1] + scale * tet_r[i][1]; - local_offset[2] = offset[2] + scale * tet_r[i][2]; + int idx = i*3; + local_offset[0] = offset[0] + scale * tetrahedron_v[idx ]; + local_offset[1] = offset[1] + scale * tetrahedron_v[idx+1]; + local_offset[2] = offset[2] + scale * tetrahedron_v[idx+2]; fghSierpinskiSpongeGenerate ( numLevels, local_offset, scale, vertices+i*stride, normals+i*stride ); } } @@ -271,7 +565,8 @@ 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 cirle + * 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 @@ -279,25 +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); @@ -306,7 +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; @@ -316,61 +606,121 @@ static void fghCircleTable(double **sint,double **cost,const int n) (*cost)[i] = cos(angle*i); } - /* Last sample is duplicate of the first */ - - (*sint)[size] = (*sint)[0]; - (*cost)[size] = (*cost)[0]; + + 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 to avoid code duplication ------------- */ +/* -- INTERNAL DRAWING functions --------------------------------------- */ +#define _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,vertIdxs)\ + static void fgh##nameICaps( GLboolean useWireMode )\ + {\ + if (!name##Cached)\ + {\ + fgh##nameICaps##Generate();\ + name##Cached = GL_TRUE;\ + }\ + \ + if (useWireMode)\ + {\ + fghDrawGeometryWire (name##_verts,name##_norms,\ + nameCaps##_NUM_FACES,nameCaps##_NUM_EDGE_PER_FACE);\ + }\ + else\ + {\ + fghDrawGeometrySolid(name##_verts,name##_norms,vertIdxs,\ + nameCaps##_VERT_PER_OBJ_TRI, nameCaps##_NUM_EDGE_PER_FACE);\ + }\ + } +#define DECLARE_INTERNAL_DRAW(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,NULL) +#define DECLARE_INTERNAL_DRAW_DECOMPOSED_TO_TRIANGLE(name,nameICaps,nameCaps) _DECLARE_INTERNAL_DRAW_DO_DECLARE(name,nameICaps,nameCaps,name##_vertIdxs) static void fghCube( GLdouble dSize, GLboolean useWireMode ) { + GLdouble *vertices; + if (!cubeCached) { fghCubeGenerate(); - cubeCached = TRUE; + cubeCached = GL_TRUE; } if (dSize!=1.) { - /* Need to build new */ - fghDrawGeometry(GL_QUADS,cube_verts,cube_norms,CUBE_VERT_PER_TETR,useWireMode); + /* Need to build new vertex list containing vertices for cube of different size */ + int i; + + vertices = malloc(CUBE_VERT_ELEM_PER_OBJ * sizeof(GLdouble)); + + /* Bail out if memory allocation fails, fgError never returns */ + if (!vertices) + { + free(vertices); + fgError("Failed to allocate memory in fghCube"); + } + + for (i=0; i 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... */ @@ -634,24 +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... */ @@ -702,16 +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 */ @@ -766,16 +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... */ @@ -821,10 +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" ); @@ -832,13 +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