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/* $Id: cva.c,v 1.8 2006/11/22 19:37:21 sroland 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>
#include <stddef.h> /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
#ifdef _WIN32
#include <windows.h>
#endif
#define GL_GLEXT_LEGACY
#include <GL/glut.h>
#include <GL/glext.h>
GLfloat verts[][4] = {
{ -0.5, -0.5, -2.0, 0.0 },
{ 0.5, -0.5, -2.0, 0.0 },
{ -0.5, 0.5, -2.0, 0.0 },
{ 0.5, 0.5, -2.0, 0.0 },
};
GLubyte color[][4] = {
{ 0xff, 0x00, 0x00, 0x00 },
{ 0x00, 0xff, 0x00, 0x00 },
{ 0x00, 0x00, 0xff, 0x00 },
{ 0xff, 0xff, 0xff, 0x00 },
};
GLuint indices[] = { 0, 1, 2, 3 };
GLboolean compiled = GL_TRUE;
GLboolean doubleBuffer = GL_TRUE;
void init( void )
{
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glShadeModel( GL_SMOOTH );
glFrontFace( GL_CCW );
glCullFace( GL_BACK );
glEnable( GL_CULL_FACE );
glEnable( GL_DEPTH_TEST );
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_COLOR_ARRAY );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 2.0, 10.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
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, 4 );
}
#endif
}
void display( void )
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, indices );
glFlush();
if ( doubleBuffer ) {
glutSwapBuffers();
}
}
void keyboard( unsigned char key, int x, int y )
{
switch ( key ) {
case 27:
exit( 0 );
break;
}
glutPostRedisplay();
}
GLboolean args( int argc, char **argv )
{
GLint i;
doubleBuffer = GL_TRUE;
for ( i = 1 ; i < argc ; i++ ) {
if ( strcmp( argv[i], "-sb" ) == 0 ) {
doubleBuffer = GL_FALSE;
} else if ( strcmp( argv[i], "-db" ) == 0 ) {
doubleBuffer = GL_TRUE;
} else {
fprintf( stderr, "%s (Bad option).\n", argv[i] );
return GL_FALSE;
}
}
return GL_TRUE;
}
int main( int argc, char **argv )
{
GLenum type;
char *string;
double version;
glutInit( &argc, argv );
if ( args( argc, argv ) == GL_FALSE ) {
exit( 1 );
}
type = GLUT_RGB | GLUT_DEPTH;
type |= ( doubleBuffer ) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode( type );
glutInitWindowSize( 250, 250 );
glutInitWindowPosition( 100, 100 );
glutCreateWindow( "CVA Test" );
/* Make sure the server supports GL 1.2 vertex arrays.
*/
string = (char *) glGetString( GL_VERSION );
version = atof(string);
if ( version < 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;
}
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