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 "glut_wrap.h"
10
11GLfloat pos[][3] =
12   { {  0.9, -0.9, 0.0 },
13     {  0.9,  0.9, 0.0 },
14     { -0.9,  0.9, 0.0 },
15     { -0.9, -0.9, 0.0 } };
16
17GLubyte color[][4] =
18{ { 0x00, 0x00, 0xff, 0x00 },
19  { 0x00, 0xff, 0x00, 0x00 },
20  { 0xff, 0x00, 0x00, 0x00 },
21  { 0xff, 0xff, 0xff, 0x00 } };
22
23static void Init( void )
24{
25   GLint errnum;
26   GLuint prognum;
27
28   static const char *prog1 =
29      "!!ARBvp1.0\n"
30      "MOV  result.color, vertex.color;\n"
31      "MOV  result.position, vertex.position;\n"
32      "END\n";
33
34   glGenProgramsARB(1, &prognum);
35   glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
36   glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
37		      strlen(prog1), (const GLubyte *) prog1);
38
39   assert(glIsProgramARB(prognum));
40   errnum = glGetError();
41   printf("glGetError = %d\n", errnum);
42   if (errnum != GL_NO_ERROR)
43   {
44      GLint errorpos;
45
46      glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
47      printf("errorpos: %d\n", errorpos);
48      printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
49   }
50
51
52   glEnableClientState( GL_VERTEX_ARRAY );
53   glEnableClientState( GL_COLOR_ARRAY );
54
55   glVertexPointer( 3, GL_FLOAT, sizeof(pos[0]), pos );
56   glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(color[0]), color );
57
58}
59
60
61
62static void Display( void )
63{
64   glClearColor(0.3, 0.3, 0.3, 1);
65   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
66
67   glEnable(GL_VERTEX_PROGRAM_ARB);
68
69   /* glDrawArrays( GL_TRIANGLES, 0, 3 ); */
70   glDrawArrays( GL_TRIANGLES, 1, 3 );
71
72   glFlush();
73}
74
75
76static void Reshape( int width, int height )
77{
78   glViewport( 0, 0, width, height );
79   glMatrixMode( GL_PROJECTION );
80   glLoadIdentity();
81   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
82   glMatrixMode( GL_MODELVIEW );
83   glLoadIdentity();
84   /*glTranslatef( 0.0, 0.0, -15.0 );*/
85}
86
87
88static void Key( unsigned char key, int x, int y )
89{
90   (void) x;
91   (void) y;
92   switch (key) {
93      case 27:
94         exit(0);
95         break;
96   }
97   glutPostRedisplay();
98}
99
100
101
102
103int main( int argc, char *argv[] )
104{
105   glutInit( &argc, argv );
106   glutInitWindowPosition( 0, 0 );
107   glutInitWindowSize( 250, 250 );
108   glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
109   glutCreateWindow(argv[0]);
110   glewInit();
111   glutReshapeFunc( Reshape );
112   glutKeyboardFunc( Key );
113   glutDisplayFunc( Display );
114   Init();
115   glutMainLoop();
116   return 0;
117}
118