165 lines
3.4 KiB
C
165 lines
3.4 KiB
C
/* $Id: cva.c,v 1.8 2006/11/22 19:37:21 sroland Exp $ */
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/*
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* Trivial CVA test, good for testing driver fastpaths (especially
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* indexed vertex buffers if they are supported).
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*
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* Gareth Hughes
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* November 2000
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef __VMS
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# include <stddef.h> /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
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#else
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# include <malloc.h> /* for ptrdiff_t, referenced by GL.h when GL_GLEXT_LEGACY defined */
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#define GL_GLEXT_LEGACY
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#include <GL/glut.h>
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GLfloat verts[][4] = {
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{ -0.5, -0.5, -2.0, 0.0 },
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{ 0.5, -0.5, -2.0, 0.0 },
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{ -0.5, 0.5, -2.0, 0.0 },
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{ 0.5, 0.5, -2.0, 0.0 },
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};
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GLubyte color[][4] = {
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{ 0xff, 0x00, 0x00, 0x00 },
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{ 0x00, 0xff, 0x00, 0x00 },
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{ 0x00, 0x00, 0xff, 0x00 },
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{ 0xff, 0xff, 0xff, 0x00 },
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};
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GLuint indices[] = { 0, 1, 2, 3 };
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GLboolean compiled = GL_TRUE;
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GLboolean doubleBuffer = GL_TRUE;
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void init( void )
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{
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glClearColor( 0.0, 0.0, 0.0, 0.0 );
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glShadeModel( GL_SMOOTH );
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glFrontFace( GL_CCW );
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glCullFace( GL_BACK );
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glEnable( GL_CULL_FACE );
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glEnable( GL_DEPTH_TEST );
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glEnableClientState( GL_VERTEX_ARRAY );
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glEnableClientState( GL_COLOR_ARRAY );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glFrustum( -1.0, 1.0, -1.0, 1.0, 2.0, 10.0 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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glVertexPointer( 3, GL_FLOAT, sizeof(verts[0]), verts );
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glColorPointer( 4, GL_UNSIGNED_BYTE, 0, color );
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#ifdef GL_EXT_compiled_vertex_array
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if ( compiled ) {
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glLockArraysEXT( 0, 4 );
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}
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#endif
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}
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void display( void )
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{
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, indices );
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glFlush();
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if ( doubleBuffer ) {
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glutSwapBuffers();
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}
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}
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void keyboard( unsigned char key, int x, int y )
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{
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switch ( key ) {
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case 27:
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exit( 0 );
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break;
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}
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glutPostRedisplay();
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}
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GLboolean args( int argc, char **argv )
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{
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GLint i;
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doubleBuffer = GL_TRUE;
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for ( i = 1 ; i < argc ; i++ ) {
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if ( strcmp( argv[i], "-sb" ) == 0 ) {
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doubleBuffer = GL_FALSE;
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} else if ( strcmp( argv[i], "-db" ) == 0 ) {
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doubleBuffer = GL_TRUE;
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} else {
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fprintf( stderr, "%s (Bad option).\n", argv[i] );
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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int main( int argc, char **argv )
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{
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GLenum type;
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char *string;
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double version;
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glutInit( &argc, argv );
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if ( args( argc, argv ) == GL_FALSE ) {
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exit( 1 );
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}
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type = GLUT_RGB | GLUT_DEPTH;
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type |= ( doubleBuffer ) ? GLUT_DOUBLE : GLUT_SINGLE;
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glutInitDisplayMode( type );
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glutInitWindowSize( 250, 250 );
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glutInitWindowPosition( 100, 100 );
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glutCreateWindow( "CVA Test" );
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/* Make sure the server supports GL 1.2 vertex arrays.
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*/
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string = (char *) glGetString( GL_VERSION );
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version = atof(string);
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if ( version < 1.2 ) {
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fprintf( stderr, "This program requires OpenGL 1.2 vertex arrays.\n" );
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exit( -1 );
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}
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/* See if the server supports compiled vertex arrays.
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*/
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string = (char *) glGetString( GL_EXTENSIONS );
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if ( !strstr( string, "GL_EXT_compiled_vertex_array" ) ) {
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fprintf( stderr, "Compiled vertex arrays not supported by this renderer.\n" );
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compiled = GL_FALSE;
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}
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init();
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glutDisplayFunc( display );
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glutKeyboardFunc( keyboard );
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glutMainLoop();
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return 0;
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}
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