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
34GLuint arrayObj, elementObj;
35
36static void Init( void )
37{
38   GLint errnum;
39   GLuint prognum;
40
41   static const char *prog1 =
42      "!!ARBvp1.0\n"
43      "MOV  result.color, vertex.color;\n"
44      "MOV  result.position, vertex.position;\n"
45      "END\n";
46
47   glGenProgramsARB(1, &prognum);
48   glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
49   glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
50		      strlen(prog1), (const GLubyte *) prog1);
51
52   assert(glIsProgramARB(prognum));
53   errnum = glGetError();
54   printf("glGetError = %d\n", errnum);
55   if (errnum != GL_NO_ERROR)
56   {
57      GLint errorpos;
58
59      glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
60      printf("errorpos: %d\n", errorpos);
61      printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
62   }
63
64
65   glEnableClientState( GL_VERTEX_ARRAY );
66   glEnableClientState( GL_COLOR_ARRAY );
67
68   glGenBuffersARB(1, &arrayObj);
69   glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
70   glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), verts, GL_STATIC_DRAW_ARB);
71
72   glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), 0 );
73   glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(verts[0]), (void *)(3*sizeof(float)) );
74
75}
76
77
78
79static void Display( void )
80{
81   glClearColor(0.3, 0.3, 0.3, 1);
82   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
83
84   glEnable(GL_VERTEX_PROGRAM_ARB);
85
86   /* glDrawArrays( GL_TRIANGLES, 0, 3 ); */
87   glDrawArrays( GL_TRIANGLES, 1, 3 );
88
89   glFlush();
90}
91
92
93static void Reshape( int width, int height )
94{
95   glViewport( 0, 0, width, height );
96   glMatrixMode( GL_PROJECTION );
97   glLoadIdentity();
98   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
99   glMatrixMode( GL_MODELVIEW );
100   glLoadIdentity();
101   /*glTranslatef( 0.0, 0.0, -15.0 );*/
102}
103
104
105static void Key( unsigned char key, int x, int y )
106{
107   (void) x;
108   (void) y;
109   switch (key) {
110      case 27:
111         exit(0);
112         break;
113   }
114   glutPostRedisplay();
115}
116
117
118
119
120int main( int argc, char *argv[] )
121{
122   glutInit( &argc, argv );
123   glutInitWindowPosition( 0, 0 );
124   glutInitWindowSize( 250, 250 );
125   glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
126   glutCreateWindow(argv[0]);
127   glewInit();
128   glutReshapeFunc( Reshape );
129   glutKeyboardFunc( Key );
130   glutDisplayFunc( Display );
131   Init();
132   glutMainLoop();
133   return 0;
134}
135