1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/* $Id: cva.c,v 1.1 2000/11/01 03:14:12 gareth Exp $ */
/*
* Trivial CVA test, good for testing driver fastpaths (especially
* indexed vertex buffers if they are supported).
*
* Gareth Hughes
* November 2000
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define GL_GLEXT_LEGACY
#include <GL/glut.h>
GLfloat verts[][4] = {
{ 0.25, 0.25, 0.0, 0.0 },
{ 0.75, 0.25, 0.0, 0.0 },
{ 0.25, 0.75, 0.0, 0.0 },
};
GLubyte color[][4] = {
{ 0xff, 0x00, 0x00, 0x00 },
{ 0x00, 0xff, 0x00, 0x00 },
{ 0x00, 0x00, 0xff, 0x00 },
};
GLuint indices[] = { 0, 1, 2 };
GLboolean compiled = GL_TRUE;
void init( void )
{
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glShadeModel( GL_SMOOTH );
glEnable( GL_DEPTH_TEST );
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_COLOR_ARRAY );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( 0.0, 1.0, 0.0, 1.0, -1.0, 1.0 );
glMatrixMode( GL_MODELVIEW );
glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), verts );
glColorPointer( 4, GL_UNSIGNED_BYTE, 0, color );
#ifdef GL_EXT_compiled_vertex_array
if ( compiled ) {
glLockArraysEXT( 0, 3 );
}
#endif
}
void display( void )
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, indices );
glFlush();
}
void keyboard( unsigned char key, int x, int y )
{
switch ( key ) {
case 27:
exit( 0 );
break;
}
}
int main( int argc, char **argv )
{
char *string;
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH );
glutInitWindowSize( 250, 250 );
glutInitWindowPosition( 100, 100 );
glutCreateWindow( "CVA Test" );
/* Make sure the server supports GL 1.2 vertex arrays.
*/
string = (char *) glGetString( GL_VERSION );
if ( !strstr( string, "1.2" ) ) {
fprintf( stderr, "This program requires OpenGL 1.2 vertex arrays.\n" );
exit( -1 );
}
/* See if the server supports compiled vertex arrays.
*/
string = (char *) glGetString( GL_EXTENSIONS );
if ( !strstr( string, "GL_EXT_compiled_vertex_array" ) ) {
fprintf( stderr, "Compiled vertex arrays not supported by this renderer.\n" );
compiled = GL_FALSE;
}
init();
glutDisplayFunc( display );
glutKeyboardFunc( keyboard );
glutMainLoop();
return 0;
}
|
