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POOpenGL: retrieve raw vertex and index buffer from displayed objects in OpenGL
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  1. POOpenGL: retrieve raw vertex and index buffer from displayed objects in OpenGL
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    copied!<p>My apologies for the long code sample. Here is my sample code:</p> <pre><code>#include &lt;iostream&gt; #include &lt;cstdlib&gt; #include &lt;GL/glut.h&gt; using namespace std; //#include "glutint.h" /* Rim, body, lid, and bottom data must be reflected in x and y; handle and spout data across the y axis only. */ static int patchdata[][16] = { /* rim */ {102, 103, 104, 105, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}, /* body */ {12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27}, {24, 25, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40}, /* lid */ {96, 96, 96, 96, 97, 98, 99, 100, 101, 101, 101, 101, 0, 1, 2, 3,}, {0, 1, 2, 3, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117}, /* bottom */ {118, 118, 118, 118, 124, 122, 119, 121, 123, 126, 125, 120, 40, 39, 38, 37}, /* handle */ {41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56}, {53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 28, 65, 66, 67}, /* spout */ {68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83}, {80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95} }; /* *INDENT-OFF* */ static float cpdata[][3] = { {0.2, 0, 2.7}, {0.2, -0.112, 2.7}, {0.112, -0.2, 2.7}, {0, -0.2, 2.7}, {1.3375, 0, 2.53125}, {1.3375, -0.749, 2.53125}, {0.749, -1.3375, 2.53125}, {0, -1.3375, 2.53125}, {1.4375, 0, 2.53125}, {1.4375, -0.805, 2.53125}, {0.805, -1.4375, 2.53125}, {0, -1.4375, 2.53125}, {1.5, 0, 2.4}, {1.5, -0.84, 2.4}, {0.84, -1.5, 2.4}, {0, -1.5, 2.4}, {1.75, 0, 1.875}, {1.75, -0.98, 1.875}, {0.98, -1.75, 1.875}, {0, -1.75, 1.875}, {2, 0, 1.35}, {2, -1.12, 1.35}, {1.12, -2, 1.35}, {0, -2, 1.35}, {2, 0, 0.9}, {2, -1.12, 0.9}, {1.12, -2, 0.9}, {0, -2, 0.9}, {-2, 0, 0.9}, {2, 0, 0.45}, {2, -1.12, 0.45}, {1.12, -2, 0.45}, {0, -2, 0.45}, {1.5, 0, 0.225}, {1.5, -0.84, 0.225}, {0.84, -1.5, 0.225}, {0, -1.5, 0.225}, {1.5, 0, 0.15}, {1.5, -0.84, 0.15}, {0.84, -1.5, 0.15}, {0, -1.5, 0.15}, {-1.6, 0, 2.025}, {-1.6, -0.3, 2.025}, {-1.5, -0.3, 2.25}, {-1.5, 0, 2.25}, {-2.3, 0, 2.025}, {-2.3, -0.3, 2.025}, {-2.5, -0.3, 2.25}, {-2.5, 0, 2.25}, {-2.7, 0, 2.025}, {-2.7, -0.3, 2.025}, {-3, -0.3, 2.25}, {-3, 0, 2.25}, {-2.7, 0, 1.8}, {-2.7, -0.3, 1.8}, {-3, -0.3, 1.8}, {-3, 0, 1.8}, {-2.7, 0, 1.575}, {-2.7, -0.3, 1.575}, {-3, -0.3, 1.35}, {-3, 0, 1.35}, {-2.5, 0, 1.125}, {-2.5, -0.3, 1.125}, {-2.65, -0.3, 0.9375}, {-2.65, 0, 0.9375}, {-2, -0.3, 0.9}, {-1.9, -0.3, 0.6}, {-1.9, 0, 0.6}, {1.7, 0, 1.425}, {1.7, -0.66, 1.425}, {1.7, -0.66, 0.6}, {1.7, 0, 0.6}, {2.6, 0, 1.425}, {2.6, -0.66, 1.425}, {3.1, -0.66, 0.825}, {3.1, 0, 0.825}, {2.3, 0, 2.1}, {2.3, -0.25, 2.1}, {2.4, -0.25, 2.025}, {2.4, 0, 2.025}, {2.7, 0, 2.4}, {2.7, -0.25, 2.4}, {3.3, -0.25, 2.4}, {3.3, 0, 2.4}, {2.8, 0, 2.475}, {2.8, -0.25, 2.475}, {3.525, -0.25, 2.49375}, {3.525, 0, 2.49375}, {2.9, 0, 2.475}, {2.9, -0.15, 2.475}, {3.45, -0.15, 2.5125}, {3.45, 0, 2.5125}, {2.8, 0, 2.4}, {2.8, -0.15, 2.4}, {3.2, -0.15, 2.4}, {3.2, 0, 2.4}, {0, 0, 3.15}, {0.8, 0, 3.15}, {0.8, -0.45, 3.15}, {0.45, -0.8, 3.15}, {0, -0.8, 3.15}, {0, 0, 2.85}, {1.4, 0, 2.4}, {1.4, -0.784, 2.4}, {0.784, -1.4, 2.4}, {0, -1.4, 2.4}, {0.4, 0, 2.55}, {0.4, -0.224, 2.55}, {0.224, -0.4, 2.55}, {0, -0.4, 2.55}, {1.3, 0, 2.55}, {1.3, -0.728, 2.55}, {0.728, -1.3, 2.55}, {0, -1.3, 2.55}, {1.3, 0, 2.4}, {1.3, -0.728, 2.4}, {0.728, -1.3, 2.4}, {0, -1.3, 2.4}, {0, 0, 0}, {1.425, -0.798, 0}, {1.5, 0, 0.075}, {1.425, 0, 0}, {0.798, -1.425, 0}, {0, -1.5, 0.075}, {0, -1.425, 0}, {1.5, -0.84, 0.075}, {0.84, -1.5, 0.075} }; static float tex[2][2][2] = { { {0, 0}, {1, 0}}, { {0, 1}, {1, 1}} }; /* *INDENT-ON* */ static void teapot(GLint grid, GLdouble scale, GLenum type) { float p[4][4][3], q[4][4][3], r[4][4][3], s[4][4][3]; long i, j, k, l; glPushAttrib(GL_ENABLE_BIT | GL_EVAL_BIT); glEnable(GL_AUTO_NORMAL); glEnable(GL_NORMALIZE); glEnable(GL_MAP2_VERTEX_3); glEnable(GL_MAP2_TEXTURE_COORD_2); glPushMatrix(); glRotatef(270.0, 1.0, 0.0, 0.0); glScalef(0.5 * scale, 0.5 * scale, 0.5 * scale); glTranslatef(0.0, 0.0, -1.5); for (i = 0; i &lt; 10; i++) { for (j = 0; j &lt; 4; j++) { for (k = 0; k &lt; 4; k++) { for (l = 0; l &lt; 3; l++) { p[j][k][l] = cpdata[patchdata[i][j * 4 + k]][l]; q[j][k][l] = cpdata[patchdata[i][j * 4 + (3 - k)]][l]; if (l == 1) q[j][k][l] *= -1.0; if (i &lt; 6) { r[j][k][l] = cpdata[patchdata[i][j * 4 + (3 - k)]][l]; if (l == 0) r[j][k][l] *= -1.0; s[j][k][l] = cpdata[patchdata[i][j * 4 + k]][l]; if (l == 0) s[j][k][l] *= -1.0; if (l == 1) s[j][k][l] *= -1.0; } } } } glMap2f(GL_MAP2_TEXTURE_COORD_2, 0, 1, 2, 2, 0, 1, 4, 2, &amp;tex[0][0][0]); glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &amp;p[0][0][0]); glMapGrid2f(grid, 0.0, 1.0, grid, 0.0, 1.0); glEvalMesh2(type, 0, grid, 0, grid); glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &amp;q[0][0][0]); glEvalMesh2(type, 0, grid, 0, grid); if (i &lt; 6) { glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &amp;r[0][0][0]); glEvalMesh2(type, 0, grid, 0, grid); glMap2f(GL_MAP2_VERTEX_3, 0, 1, 3, 4, 0, 1, 12, 4, &amp;s[0][0][0]); glEvalMesh2(type, 0, grid, 0, grid); } } glPopMatrix(); glPopAttrib(); } /* CENTRY */ void APIENTRY _glutSolidTeapot(GLdouble scale) { teapot(14, scale, GL_FILL); } void APIENTRY _glutWireTeapot(GLdouble scale) { teapot(10, scale, GL_LINE); } // function prototypes void disp(void); void keyb(unsigned char key, int x, int y); // window identifier static int win; int main(int argc, char **argv){ ////////// // INIT // ////////// // initialize glut glutInit(&amp;argc, argv); // specify the display mode to be RGB and single buffering // we use single buffering since this will be non animated glutInitDisplayMode(GLUT_RGBA | GLUT_SINGLE); // define the size glutInitWindowSize(500,500); // the position where the window will appear glutInitWindowPosition(100,100); // if we would want fullscreen: // glutFullScreen(); // create the window, set the title and keep the // window identifier. win = glutCreateWindow("Yet another teapot"); ////////////// // CALLBACK // ////////////// glutDisplayFunc(disp); glutKeyboardFunc(keyb); //////////// // OPENGL // //////////// // define the color we use to clearscreen glClearColor(0.0,0.0,0.0,0.0); // enter the main loop glutMainLoop(); return 0; } void disp(void){ // do a clearscreen glClear(GL_COLOR_BUFFER_BIT); // draw something _glutWireTeapot(0.5); // glutSolidTeapot(0.5); // glutWireSphere(0.5,100,100); // glutSolidSphere(0.5,100,100); // glutWireTorus(0.3,0.5,100,100); // glutSolidTorus(0.3,0.5,100,100); // glutWireIcosahedron(); // glutSolidIcosahedron(); // glutWireDodecahedron(); // glutSolidDodecahedron(); // glutWireCone(0.5,0.5,100,100); // glutSolidCone(0.5,0.5,100,100); // glutWireCube(0.5); // glutSolidCube(0.5); } void keyb(unsigned char key, int x, int y){ cout &lt;&lt; "Pressed key " &lt;&lt; key &lt;&lt; " on coordinates (" &lt;&lt; x &lt;&lt; "," &lt;&lt; y &lt;&lt; ")"; cout &lt;&lt; endl; if(key == 'q'){ cout &lt;&lt; "Got q,so quitting " &lt;&lt; endl; glutDestroyWindow(win); exit(0); } } </code></pre> <p><a href="http://mindfuck.de-brauwer.be/articles/glut/" rel="nofollow noreferrer">http://mindfuck.de-brauwer.be/articles/glut/</a></p> <p><a href="http://www.it.freebsd.org/pub/Unix/NetBSD/NetBSD-current/xsrc/external/mit/MesaGLUT/dist/src/glut/beos/glut_teapot.c" rel="nofollow noreferrer">http://www.it.freebsd.org/pub/Unix/NetBSD/NetBSD-current/xsrc/external/mit/MesaGLUT/dist/src/glut/beos/glut_teapot.c</a></p> <p>Are relevant references.</p> <p>Thank you Misha Koshelev</p>
 

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