| /* |
| * A lit, rotating torus via vertex program |
| */ |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #define GL_GLEXT_PROTOTYPES |
| #include <GL/glut.h> |
| |
| static float Xrot = 0.0, Yrot = 0.0, Zrot = 0.0; |
| static GLboolean Anim = GL_TRUE; |
| |
| |
| static void Idle( void ) |
| { |
| Xrot += .3; |
| Yrot += .4; |
| Zrot += .2; |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Display( void ) |
| { |
| glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); |
| |
| glPushMatrix(); |
| glRotatef(Xrot, 1, 0, 0); |
| glRotatef(Yrot, 0, 1, 0); |
| glRotatef(Zrot, 0, 0, 1); |
| glutSolidTorus(0.75, 2.0, 10, 20); |
| glPopMatrix(); |
| |
| glutSwapBuffers(); |
| } |
| |
| |
| static void Reshape( int width, int height ) |
| { |
| glViewport( 0, 0, width, height ); |
| glMatrixMode( GL_PROJECTION ); |
| glLoadIdentity(); |
| glFrustum( -2.0, 2.0, -2.0, 2.0, 5.0, 25.0 ); |
| glMatrixMode( GL_MODELVIEW ); |
| glLoadIdentity(); |
| glTranslatef( 0.0, 0.0, -12.0 ); |
| } |
| |
| |
| static void Key( unsigned char key, int x, int y ) |
| { |
| (void) x; |
| (void) y; |
| switch (key) { |
| case ' ': |
| Xrot = Yrot = Zrot = 0; |
| break; |
| case 'a': |
| Anim = !Anim; |
| if (Anim) |
| glutIdleFunc(Idle); |
| else |
| glutIdleFunc(NULL); |
| break; |
| case 'z': |
| Zrot -= 5.0; |
| break; |
| case 'Z': |
| Zrot += 5.0; |
| break; |
| case 27: |
| exit(0); |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void SpecialKey( int key, int x, int y ) |
| { |
| const GLfloat step = 3.0; |
| (void) x; |
| (void) y; |
| switch (key) { |
| case GLUT_KEY_UP: |
| Xrot -= step; |
| break; |
| case GLUT_KEY_DOWN: |
| Xrot += step; |
| break; |
| case GLUT_KEY_LEFT: |
| Yrot -= step; |
| break; |
| case GLUT_KEY_RIGHT: |
| Yrot += step; |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void Init( void ) |
| { |
| GLint errno; |
| GLuint prognum; |
| |
| /* borrowed from an nvidia demo: |
| * c[0..3] = modelview matrix |
| * c[4..7] = invtrans modelview matrix |
| * c[32] = light pos |
| * c[35] = diffuse color |
| */ |
| static const char prog[] = |
| "!!ARBvp1.0\n" |
| "OPTION ARB_position_invariant ;" |
| "TEMP R0, R1; \n" |
| |
| "# normal x MV-1T -> lighting normal\n" |
| "DP3 R1.x, state.matrix.modelview.invtrans.row[0], vertex.normal ;\n" |
| "DP3 R1.y, state.matrix.modelview.invtrans.row[1], vertex.normal;\n" |
| "DP3 R1.z, state.matrix.modelview.invtrans.row[2], vertex.normal;\n" |
| |
| "DP3 R0, program.local[32], R1; # L.N\n" |
| #if 0 |
| "MUL result.color.xyz, R0, program.local[35] ; # col = L.N * diffuse\n" |
| #else |
| "MUL result.color.primary.xyz, R0, program.local[35] ; # col = L.N * diffuse\n" |
| #endif |
| "MOV result.texcoord, vertex.texcoord;\n" |
| "END"; |
| |
| if (!glutExtensionSupported("GL_ARB_vertex_program")) { |
| printf("Sorry, this program requires GL_ARB_vertex_program"); |
| exit(1); |
| } |
| |
| |
| glGenProgramsARB(1, &prognum); |
| |
| glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum); |
| glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, |
| strlen(prog), (const GLubyte *) prog); |
| |
| assert(glIsProgramARB(prognum)); |
| errno = glGetError(); |
| printf("glGetError = %d\n", errno); |
| if (errno != GL_NO_ERROR) |
| { |
| GLint errorpos; |
| |
| glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos); |
| printf("errorpos: %d\n", errorpos); |
| printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB)); |
| } |
| |
| /* Light position */ |
| glProgramLocalParameter4fARB(GL_VERTEX_PROGRAM_ARB, 32, 2, 2, 4, 1); |
| /* Diffuse material color */ |
| glProgramLocalParameter4fARB(GL_VERTEX_PROGRAM_ARB, 35, 0.25, 0, 0.25, 1); |
| |
| glEnable(GL_VERTEX_PROGRAM_ARB); |
| glEnable(GL_DEPTH_TEST); |
| glClearColor(0.3, 0.3, 0.3, 1); |
| } |
| |
| |
| int main( int argc, char *argv[] ) |
| { |
| glutInit( &argc, argv ); |
| glutInitWindowPosition( 0, 0 ); |
| glutInitWindowSize( 250, 250 ); |
| glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); |
| glutCreateWindow(argv[0]); |
| glutReshapeFunc( Reshape ); |
| glutKeyboardFunc( Key ); |
| glutSpecialFunc( SpecialKey ); |
| glutDisplayFunc( Display ); |
| if (Anim) |
| glutIdleFunc(Idle); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |