1 /* $Id: cva.c,v 1.8 2006/11/22 19:37:21 sroland Exp $ */
4 * Trivial CVA test, good for testing driver fastpaths (especially
5 * indexed vertex buffers if they are supported).
14 #include <stddef.h> /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
18 #define GL_GLEXT_LEGACY
22 GLfloat verts
[][4] = {
23 { -0.5, -0.5, -2.0, 0.0 },
24 { 0.5, -0.5, -2.0, 0.0 },
25 { -0.5, 0.5, -2.0, 0.0 },
26 { 0.5, 0.5, -2.0, 0.0 },
29 GLubyte color
[][4] = {
30 { 0xff, 0x00, 0x00, 0x00 },
31 { 0x00, 0xff, 0x00, 0x00 },
32 { 0x00, 0x00, 0xff, 0x00 },
33 { 0xff, 0xff, 0xff, 0x00 },
36 GLuint indices
[] = { 0, 1, 2, 3 };
38 GLboolean compiled
= GL_TRUE
;
39 GLboolean doubleBuffer
= GL_TRUE
;
44 glClearColor( 0.0, 0.0, 0.0, 0.0 );
45 glShadeModel( GL_SMOOTH
);
47 glFrontFace( GL_CCW
);
48 glCullFace( GL_BACK
);
49 glEnable( GL_CULL_FACE
);
51 glEnable( GL_DEPTH_TEST
);
53 glEnableClientState( GL_VERTEX_ARRAY
);
54 glEnableClientState( GL_COLOR_ARRAY
);
56 glMatrixMode( GL_PROJECTION
);
58 glFrustum( -1.0, 1.0, -1.0, 1.0, 2.0, 10.0 );
59 glMatrixMode( GL_MODELVIEW
);
62 glVertexPointer( 3, GL_FLOAT
, sizeof(verts
[0]), verts
);
63 glColorPointer( 4, GL_UNSIGNED_BYTE
, 0, color
);
65 #ifdef GL_EXT_compiled_vertex_array
67 glLockArraysEXT( 0, 4 );
74 glClear( GL_COLOR_BUFFER_BIT
| GL_DEPTH_BUFFER_BIT
);
76 glDrawElements( GL_TRIANGLES
, 3, GL_UNSIGNED_INT
, indices
);
84 void keyboard( unsigned char key
, int x
, int y
)
95 GLboolean
args( int argc
, char **argv
)
99 doubleBuffer
= GL_TRUE
;
101 for ( i
= 1 ; i
< argc
; i
++ ) {
102 if ( strcmp( argv
[i
], "-sb" ) == 0 ) {
103 doubleBuffer
= GL_FALSE
;
104 } else if ( strcmp( argv
[i
], "-db" ) == 0 ) {
105 doubleBuffer
= GL_TRUE
;
107 fprintf( stderr
, "%s (Bad option).\n", argv
[i
] );
114 int main( int argc
, char **argv
)
120 glutInit( &argc
, argv
);
122 if ( args( argc
, argv
) == GL_FALSE
) {
126 type
= GLUT_RGB
| GLUT_DEPTH
;
127 type
|= ( doubleBuffer
) ? GLUT_DOUBLE
: GLUT_SINGLE
;
129 glutInitDisplayMode( type
);
130 glutInitWindowSize( 250, 250 );
131 glutInitWindowPosition( 100, 100 );
132 glutCreateWindow( "CVA Test" );
134 /* Make sure the server supports GL 1.2 vertex arrays.
136 string
= (char *) glGetString( GL_VERSION
);
138 version
= atof(string
);
139 if ( version
< 1.2 ) {
140 fprintf( stderr
, "This program requires OpenGL 1.2 vertex arrays.\n" );
144 /* See if the server supports compiled vertex arrays.
146 string
= (char *) glGetString( GL_EXTENSIONS
);
148 if ( !strstr( string
, "GL_EXT_compiled_vertex_array" ) ) {
149 fprintf( stderr
, "Compiled vertex arrays not supported by this renderer.\n" );
155 glutDisplayFunc( display
);
156 glutKeyboardFunc( keyboard
);