| /* |
| * To demo that specular color gets lost someplace after vertex |
| * program completion and fragment program startup |
| */ |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/glew.h> |
| #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, fprognum; |
| |
| static const char prog[] = |
| "!!ARBvp1.0\n" |
| "DP4 result.position.x, state.matrix.mvp.row[0], vertex.position ;\n" |
| "DP4 result.position.y, state.matrix.mvp.row[1], vertex.position ;\n" |
| "DP4 result.position.z, state.matrix.mvp.row[2], vertex.position ;\n" |
| "DP4 result.position.w, state.matrix.mvp.row[3], vertex.position ;\n" |
| "MOV result.color.front.primary, {.5, .5, .5, 1};\n" |
| "MOV result.color.front.secondary, {1, 1, 1, 1};\n" |
| "END"; |
| |
| static const char fprog[] = |
| "!!ARBfp1.0\n" |
| "MOV result.color, fragment.color.secondary;\n" |
| "END"; |
| |
| if (!glutExtensionSupported("GL_ARB_vertex_program")) { |
| printf("Sorry, this program requires GL_ARB_vertex_program"); |
| exit(1); |
| } |
| |
| if (!glutExtensionSupported("GL_ARB_fragment_program")) { |
| printf("Sorry, this program requires GL_ARB_fragment_program"); |
| exit(1); |
| } |
| |
| glGenProgramsARB(1, &prognum); |
| glGenProgramsARB(1, &fprognum); |
| |
| 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)); |
| } |
| |
| glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, fprognum); |
| glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, |
| strlen(fprog), (const GLubyte *) fprog); |
| 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)); |
| } |
| |
| glEnable(GL_VERTEX_PROGRAM_ARB); |
| glEnable(GL_FRAGMENT_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]); |
| glewInit(); |
| glutReshapeFunc( Reshape ); |
| glutKeyboardFunc( Key ); |
| glutSpecialFunc( SpecialKey ); |
| glutDisplayFunc( Display ); |
| if (Anim) |
| glutIdleFunc(Idle); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |