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
11
12struct {
13   GLfloat pos[3];
14   GLubyte color[4];
15} verts[] =
16{
17   { {  0.9, -0.9, 0.0 },
18     { 0x00, 0x00, 0xff, 0x00 }
19   },
20
21   { {  0.9,  0.9, 0.0 },
22     { 0x00, 0xff, 0x00, 0x00 }
23   },
24
25   { { -0.9,  0.9, 0.0 },
26     { 0xff, 0x00, 0x00, 0x00 }
27   },
28
29   { { -0.9, -0.9, 0.0 },
30     { 0xff, 0xff, 0xff, 0x00 }
31   },
32};
33
34static void Init( void )
35{
36   GLint errnum;
37   GLuint prognum;
38
39   static const char *prog1 =
40      "!!ARBvp1.0\n"
41      "MOV  result.color, vertex.color;\n"
42      "MOV  result.position, vertex.position;\n"
43      "END\n";
44
45   glGenProgramsARB(1, &prognum);
46   glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
47   glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
48		      strlen(prog1), (const GLubyte *) prog1);
49
50   assert(glIsProgramARB(prognum));
51   errnum = glGetError();
52   printf("glGetError = %d\n", errnum);
53   if (errnum != GL_NO_ERROR)
54   {
55      GLint errorpos;
56
57      glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
58      printf("errorpos: %d\n", errorpos);
59      printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
60   }
61
62
63   glEnableClientState( GL_VERTEX_ARRAY );
64   glEnableClientState( GL_COLOR_ARRAY );
65
66   glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), verts[0].pos );
67   glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(verts[0]), verts[0].color );
68
69}
70
71
72
73static void Display( void )
74{
75   glClearColor(0.3, 0.3, 0.3, 1);
76   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
77
78   glEnable(GL_VERTEX_PROGRAM_ARB);
79
80   /* glDrawArrays( GL_TRIANGLES, 0, 3 ); */
81   glDrawArrays( GL_TRIANGLES, 1, 3 );
82
83   glFlush();
84}
85
86
87static void Reshape( int width, int height )
88{
89   glViewport( 0, 0, width, height );
90   glMatrixMode( GL_PROJECTION );
91   glLoadIdentity();
92   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
93   glMatrixMode( GL_MODELVIEW );
94   glLoadIdentity();
95   /*glTranslatef( 0.0, 0.0, -15.0 );*/
96}
97
98
99static void Key( unsigned char key, int x, int y )
100{
101   (void) x;
102   (void) y;
103   switch (key) {
104      case 27:
105         exit(0);
106         break;
107   }
108   glutPostRedisplay();
109}
110
111
112
113
114int main( int argc, char *argv[] )
115{
116   glutInit( &argc, argv );
117   glutInitWindowPosition( 0, 0 );
118   glutInitWindowSize( 250, 250 );
119   glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
120   glutCreateWindow(argv[0]);
121   glewInit();
122   glutReshapeFunc( Reshape );
123   glutKeyboardFunc( Key );
124   glutDisplayFunc( Display );
125   Init();
126   glutMainLoop();
127   return 0;
128}
129