now using one function to generate geometry from the lists of vertices,
normals and vertex indices Geometry lists now stored in 1D arrays git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1149 7f0cb862-5218-0410-a997-914c9d46530a
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dcnieho
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@ -91,6 +91,35 @@ static void fghDrawGeometry(GLenum vertexMode, double* vertices, double* normals
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}
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}
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static void fghGenerateGeometry(int numFaces, int numVertPerFace, GLdouble *vertices, GLubyte* vertIndices, GLdouble *normals, GLdouble *vertOut, GLdouble *normOut)
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{
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int i,j;
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/*
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* Build array with vertices from vertex coordinates and vertex indices
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* Do same for normals.
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* Need to do this because of different normals at shared vertices
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* (and because normals' coordinates need to be negated).
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*/
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for (i=0; i<numFaces; i++)
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{
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int normIdx = i*3;
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int faceIdxVertIdx = i*numVertPerFace;
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for (j=0; j<numVertPerFace; j++)
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{
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int outIdx = i*numVertPerFace*3+j*3;
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int vertIdx = vertIndices[faceIdxVertIdx+j]*3;
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vertOut[outIdx ] = vertices[vertIdx ];
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vertOut[outIdx+1] = vertices[vertIdx+1];
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vertOut[outIdx+2] = vertices[vertIdx+2];
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normOut[outIdx ] = normals [normIdx ];
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normOut[outIdx+1] = normals [normIdx+1];
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normOut[outIdx+2] = normals [normIdx+2];
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}
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}
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}
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/* -- INTERNAL SETUP OF GEOMETRY --------------------------------------- */
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static unsigned int ipow (int x, unsigned int y)
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@ -112,32 +141,37 @@ static unsigned int ipow (int x, unsigned int y)
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#define CUBE_VERT_PER_TETR CUBE_NUM_FACES*CUBE_NUM_VERT_PER_FACE
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#define CUBE_VERT_ELEM_PER_TETR CUBE_VERT_PER_TETR*3
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/* Vertex Coordinates */
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static GLdouble cube_v[CUBE_NUM_VERT][3] =
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static GLdouble cube_v[CUBE_NUM_VERT*3] =
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{
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{ .5, .5, .5},
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{-.5, .5, .5},
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{-.5,-.5, .5},
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{ .5,-.5, .5},
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{ .5,-.5,-.5},
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{ .5, .5,-.5},
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{-.5, .5,-.5},
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{-.5,-.5,-.5}
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.5, .5, .5,
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-.5, .5, .5,
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-.5,-.5, .5,
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.5,-.5, .5,
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.5,-.5,-.5,
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.5, .5,-.5,
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-.5, .5,-.5,
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-.5,-.5,-.5
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};
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/* Normal Vectors */
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static GLdouble cube_n[CUBE_NUM_FACES][3] =
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static GLdouble cube_n[CUBE_NUM_FACES*3] =
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{
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{ 0.0, 0.0, 1.0},
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{ 1.0, 0.0, 0.0},
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{ 0.0, 1.0, 0.0},
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{-1.0, 0.0, 0.0},
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{ 0.0,-1.0, 0.0},
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{ 0.0, 0.0,-1.0}
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0.0, 0.0, 1.0,
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1.0, 0.0, 0.0,
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0.0, 1.0, 0.0,
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-1.0, 0.0, 0.0,
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0.0,-1.0, 0.0,
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0.0, 0.0,-1.0
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};
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/* Vertex indices */
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static GLubyte cube_vi[CUBE_NUM_FACES][CUBE_NUM_VERT_PER_FACE] =
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static GLubyte cube_vi[CUBE_NUM_FACES*CUBE_NUM_VERT_PER_FACE] =
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{
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{0,1,2,3}, {0,3,4,5}, {0,5,6,1}, {1,6,7,2}, {7,4,3,2}, {4,7,6,5}
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0,1,2,3,
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0,3,4,5,
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0,5,6,1,
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1,6,7,2,
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7,4,3,2,
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4,7,6,5
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};
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/* Cache of input to glDrawArrays */
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@ -147,21 +181,7 @@ static double cube_norms[CUBE_VERT_ELEM_PER_TETR];
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static void fghCubeGenerate()
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{
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int i,j;
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for (i=0; i<CUBE_NUM_FACES; i++)
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{
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for (j=0; j<CUBE_NUM_VERT_PER_FACE; j++)
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{
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int idx = i*CUBE_NUM_VERT_PER_FACE*3+j*3;
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cube_verts[idx ] = cube_v[cube_vi[i][j]][0];
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cube_verts[idx+1] = cube_v[cube_vi[i][j]][1];
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cube_verts[idx+2] = cube_v[cube_vi[i][j]][2];
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cube_norms[idx ] = cube_n[i][0];
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cube_norms[idx+1] = cube_n[i][1];
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cube_norms[idx+2] = cube_n[i][2];
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}
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}
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fghGenerateGeometry(CUBE_NUM_FACES, CUBE_NUM_VERT_PER_FACE, cube_v, cube_vi, cube_n, cube_verts, cube_norms);
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}
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/* -- Tetrahedron -- */
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@ -181,26 +201,29 @@ static void fghCubeGenerate()
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#define TETR_VERT_ELEM_PER_TETR TETR_VERT_PER_TETR*3
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/* Vertex Coordinates */
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static GLdouble tet_r[TETR_NUM_VERT][3] =
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static GLdouble tetr_v[TETR_NUM_VERT*3] =
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{
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{ 1.0, 0.0, 0.0 },
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{ -0.333333333333, 0.942809041582, 0.0 },
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{ -0.333333333333, -0.471404520791, 0.816496580928 },
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{ -0.333333333333, -0.471404520791, -0.816496580928 }
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1.0, 0.0, 0.0,
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-0.333333333333, 0.942809041582, 0.0,
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-0.333333333333, -0.471404520791, 0.816496580928,
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-0.333333333333, -0.471404520791, -0.816496580928
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};
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/* Normal Vectors */
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static GLdouble tet_n[CUBE_NUM_FACES][3] =
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static GLdouble tetr_n[CUBE_NUM_FACES*3] =
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{
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{ - 1.0, 0.0, 0.0 },
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{ 0.333333333333, -0.942809041582, 0.0 },
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{ 0.333333333333, 0.471404520791, -0.816496580928 },
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{ 0.333333333333, 0.471404520791, 0.816496580928 }
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- 1.0, 0.0, 0.0,
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0.333333333333, -0.942809041582, 0.0,
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0.333333333333, 0.471404520791, -0.816496580928,
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0.333333333333, 0.471404520791, 0.816496580928
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};
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/* Vertex indices */
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static GLubyte tet_i[TETR_NUM_FACES][TETR_NUM_VERT_PER_FACE] =
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static GLubyte tetr_vi[TETR_NUM_FACES*TETR_NUM_VERT_PER_FACE] =
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{
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{ 1, 3, 2 }, { 0, 2, 3 }, { 0, 3, 1 }, { 0, 1, 2 }
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1, 3, 2,
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0, 2, 3,
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0, 3, 1,
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0, 1, 2
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};
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/* Cache of input to glDrawArrays */
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@ -210,27 +233,7 @@ static double tetr_norms[TETR_VERT_ELEM_PER_TETR];
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static void fghTetrahedronGenerate()
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{
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int i,j;
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/*
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* Build array with vertices from vertex coordinates and vertex indices
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* Do same for normals.
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* Need to do this because of different normals at shared vertices
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* (and because normals' coordinates need to be negated).
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*/
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for (i=0; i<TETR_NUM_FACES; i++)
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{
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for (j=0; j<TETR_NUM_VERT_PER_FACE; j++)
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{
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int idx = i*TETR_NUM_VERT_PER_FACE*3+j*3;
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tetr_verts[idx ] = tet_r[tet_i[i][j]][0];
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tetr_verts[idx+1] = tet_r[tet_i[i][j]][1];
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tetr_verts[idx+2] = tet_r[tet_i[i][j]][2];
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tetr_norms[idx ] = tet_n[i][0];
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tetr_norms[idx+1] = tet_n[i][1];
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tetr_norms[idx+2] = tet_n[i][2];
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}
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}
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fghGenerateGeometry(TETR_NUM_FACES, TETR_NUM_VERT_PER_FACE, tetr_v, tetr_vi, tetr_n, tetr_verts, tetr_norms);
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}
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/* -- Sierpinski Sponge -- */
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@ -241,16 +244,20 @@ static void fghSierpinskiSpongeGenerate ( int numLevels, GLdouble offset[3], GLd
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{
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for (i=0; i<TETR_NUM_FACES; i++)
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{
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int normIdx = i*3;
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int faceIdxVertIdx = i*TETR_NUM_VERT_PER_FACE;
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for (j=0; j<TETR_NUM_VERT_PER_FACE; j++)
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{
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int idx = i*TETR_NUM_VERT_PER_FACE*3+j*3;
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vertices[idx ] = offset[0] + scale * tet_r[tet_i[i][j]][0];
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vertices[idx+1] = offset[1] + scale * tet_r[tet_i[i][j]][1];
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vertices[idx+2] = offset[2] + scale * tet_r[tet_i[i][j]][2];
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int outIdx = i*TETR_NUM_VERT_PER_FACE*3+j*3;
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int vertIdx = tetr_vi[faceIdxVertIdx+j]*3;
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normals [idx ] = -tet_r[i][0];
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normals [idx+1] = -tet_r[i][1];
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normals [idx+2] = -tet_r[i][2];
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vertices[outIdx ] = offset[0] + scale * tetr_v[vertIdx ];
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vertices[outIdx+1] = offset[1] + scale * tetr_v[vertIdx+1];
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vertices[outIdx+2] = offset[2] + scale * tetr_v[vertIdx+2];
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normals [outIdx ] = tetr_n[normIdx ];
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normals [outIdx+1] = tetr_n[normIdx+1];
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normals [outIdx+2] = tetr_n[normIdx+2];
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}
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}
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}
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@ -261,9 +268,10 @@ static void fghSierpinskiSpongeGenerate ( int numLevels, GLdouble offset[3], GLd
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scale /= 2.0 ;
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for ( i = 0 ; i < TETR_NUM_FACES ; i++ )
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{
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local_offset[0] = offset[0] + scale * tet_r[i][0];
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local_offset[1] = offset[1] + scale * tet_r[i][1];
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local_offset[2] = offset[2] + scale * tet_r[i][2];
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int idx = i*3;
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local_offset[0] = offset[0] + scale * tetr_v[idx ];
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local_offset[1] = offset[1] + scale * tetr_v[idx+1];
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local_offset[2] = offset[2] + scale * tetr_v[idx+2];
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fghSierpinskiSpongeGenerate ( numLevels, local_offset, scale, vertices+i*stride, normals+i*stride );
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}
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}
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