| Keith Whitwell | 5f2569a | 2009-04-30 12:35:59 +0100 | [diff] [blame] | 1 | /* Basic VBO */ |
| 2 | |
| 3 | #include <assert.h> |
| 4 | #include <string.h> |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <math.h> |
| 8 | #include <GL/glew.h> |
| 9 | #include <GL/glut.h> |
| 10 | |
| 11 | |
| 12 | struct { |
| 13 | GLfloat pos[4][4]; |
| 14 | GLfloat col[4][4]; |
| 15 | } verts = |
| 16 | { |
| 17 | /* Position: a quad |
| 18 | */ |
| 19 | { |
| 20 | { 0.9, -0.9, 0.0, 1.0 }, |
| 21 | { 0.9, 0.9, 0.0, 1.0 }, |
| 22 | { -0.9, 0.9, 0.0, 1.0 }, |
| 23 | { -0.9, -0.9, 0.0, 1.0 }, |
| 24 | }, |
| 25 | |
| 26 | /* Color: all red |
| 27 | */ |
| 28 | { |
| 29 | { 1.0, 0.0, 0.0, 1.0 }, |
| 30 | { 1.0, 0.0, 0.0, 1.0 }, |
| 31 | { 1.0, 0.0, 0.0, 1.0 }, |
| 32 | { 1.0, 0.0, 0.0, 1.0 }, |
| 33 | }, |
| 34 | |
| 35 | |
| 36 | }; |
| 37 | |
| 38 | GLuint arrayObj, elementObj; |
| 39 | |
| 40 | static void Init( void ) |
| 41 | { |
| 42 | GLint errno; |
| 43 | GLuint prognum; |
| 44 | |
| 45 | static const char *prog1 = |
| 46 | "!!ARBvp1.0\n" |
| 47 | "MOV result.color, vertex.color;\n" |
| 48 | "MOV result.position, vertex.position;\n" |
| 49 | "END\n"; |
| 50 | |
| 51 | glGenProgramsARB(1, &prognum); |
| 52 | glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum); |
| 53 | glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, |
| 54 | strlen(prog1), (const GLubyte *) prog1); |
| 55 | |
| 56 | assert(glIsProgramARB(prognum)); |
| 57 | errno = glGetError(); |
| 58 | printf("glGetError = %d\n", errno); |
| 59 | if (errno != GL_NO_ERROR) |
| 60 | { |
| 61 | GLint errorpos; |
| 62 | |
| 63 | glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos); |
| 64 | printf("errorpos: %d\n", errorpos); |
| 65 | printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB)); |
| 66 | } |
| 67 | |
| 68 | |
| 69 | glEnableClientState( GL_VERTEX_ARRAY ); |
| 70 | glEnableClientState( GL_COLOR_ARRAY ); |
| 71 | |
| 72 | glGenBuffersARB(1, &arrayObj); |
| 73 | glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj); |
| 74 | glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), &verts, GL_STATIC_DRAW_ARB); |
| 75 | |
| 76 | glVertexPointer( 4, GL_FLOAT, sizeof(verts.pos[0]), 0 ); |
| 77 | glColorPointer( 4, GL_FLOAT, sizeof(verts.col[0]), (void *)(4*4*sizeof(float)) ); |
| 78 | |
| 79 | } |
| 80 | |
| 81 | |
| 82 | |
| 83 | static void Display( void ) |
| 84 | { |
| 85 | glClearColor(0.3, 0.3, 0.3, 1); |
| 86 | glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); |
| 87 | |
| 88 | glEnable(GL_VERTEX_PROGRAM_ARB); |
| 89 | |
| 90 | // glDrawArrays( GL_TRIANGLES, 0, 3 ); |
| 91 | // glDrawArrays( GL_TRIANGLES, 1, 3 ); |
| 92 | glDrawArrays( GL_QUADS, 0, 4 ); |
| 93 | |
| 94 | glFlush(); |
| 95 | } |
| 96 | |
| 97 | |
| 98 | static void Reshape( int width, int height ) |
| 99 | { |
| 100 | glViewport( 0, 0, width, height ); |
| 101 | glMatrixMode( GL_PROJECTION ); |
| 102 | glLoadIdentity(); |
| 103 | glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); |
| 104 | glMatrixMode( GL_MODELVIEW ); |
| 105 | glLoadIdentity(); |
| 106 | /*glTranslatef( 0.0, 0.0, -15.0 );*/ |
| 107 | } |
| 108 | |
| 109 | |
| 110 | static void Key( unsigned char key, int x, int y ) |
| 111 | { |
| 112 | (void) x; |
| 113 | (void) y; |
| 114 | switch (key) { |
| 115 | case 27: |
| 116 | exit(0); |
| 117 | break; |
| 118 | } |
| 119 | glutPostRedisplay(); |
| 120 | } |
| 121 | |
| 122 | |
| 123 | |
| 124 | |
| 125 | int main( int argc, char *argv[] ) |
| 126 | { |
| 127 | glutInit( &argc, argv ); |
| 128 | glutInitWindowPosition( 0, 0 ); |
| 129 | glutInitWindowSize( 250, 250 ); |
| 130 | glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH ); |
| 131 | glutCreateWindow(argv[0]); |
| 132 | glewInit(); |
| 133 | glutReshapeFunc( Reshape ); |
| 134 | glutKeyboardFunc( Key ); |
| 135 | glutDisplayFunc( Display ); |
| 136 | Init(); |
| 137 | glutMainLoop(); |
| 138 | return 0; |
| 139 | } |