/* Basic VBO */ #include <assert.h> #include <string.h> #include <stdio.h> #include <stdlib.h> #include <math.h> #include <GL/glew.h> #include <GL/glut.h> struct { GLfloat pos[3]; GLubyte color[4]; } verts[] = { { { 0.9, -0.9, 0.0 }, { 0x00, 0x00, 0xff, 0x00 } }, { { 0.9, 0.9, 0.0 }, { 0x00, 0xff, 0x00, 0x00 } }, { { -0.9, 0.9, 0.0 }, { 0xff, 0x00, 0x00, 0x00 } }, { { -0.9, -0.9, 0.0 }, { 0xff, 0xff, 0xff, 0x00 } }, }; GLuint arrayObj, elementObj; static void Init( void ) { GLint errno; GLuint prognum; static const char *prog1 = "!!ARBvp1.0\n" "MOV result.color, vertex.color;\n" "MOV result.position, vertex.position;\n" "END\n"; glGenProgramsARB(1, &prognum); glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum); glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, strlen(prog1), (const GLubyte *) prog1); 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)); } glEnableClientState( GL_VERTEX_ARRAY ); glEnableClientState( GL_COLOR_ARRAY ); glGenBuffersARB(1, &arrayObj); glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj); glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts, GL_STATIC_DRAW_ARB); glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), 0 ); glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(verts[0]), (void *)(3*sizeof(float)) ); } static void Display( void ) { glClearColor(0.3, 0.3, 0.3, 1); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glEnable(GL_VERTEX_PROGRAM_ARB); /* glDrawArrays( GL_TRIANGLES, 0, 3 ); */ glDrawArrays( GL_TRIANGLES, 1, 3 ); glFlush(); } static void Reshape( int width, int height ) { glViewport( 0, 0, width, height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); /*glTranslatef( 0.0, 0.0, -15.0 );*/ } static void Key( unsigned char key, int x, int y ) { (void) x; (void) y; switch (key) { case 27: exit(0); break; } glutPostRedisplay(); } int main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitWindowPosition( 0, 0 ); glutInitWindowSize( 250, 250 ); glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH ); glutCreateWindow(argv[0]); glewInit(); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutDisplayFunc( Display ); Init(); glutMainLoop(); return 0; }