--- /dev/null
+/*
+ * Test GL_ARB_vertex_buffer_object
+ *
+ * Brian Paul
+ * 16 Sep 2003
+ */
+
+
+#define GL_GLEXT_PROTOTYPES
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+#define NUM_OBJECTS 10
+
+struct object
+{
+ GLuint BufferID;
+ GLuint NumVerts;
+ GLuint VertexOffset;
+ GLuint ColorOffset;
+};
+
+static struct object Objects[NUM_OBJECTS];
+static GLuint NumObjects;
+
+static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
+static GLboolean Anim = GL_TRUE;
+
+
+static void CheckError(int line)
+{
+ GLenum err = glGetError();
+ if (err) {
+ printf("GL Error %d at line %d\n", (int) err, line);
+ }
+}
+
+
+static void DrawObject( const struct object *obj )
+{
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glVertexPointer(3, GL_FLOAT, 0, (void *) obj->VertexOffset);
+ glEnable(GL_VERTEX_ARRAY);
+ glColorPointer(3, GL_FLOAT, 0, (void *) obj->ColorOffset);
+ glEnable(GL_COLOR_ARRAY);
+ glDrawArrays(GL_LINE_LOOP, 0, obj->NumVerts);
+}
+
+
+static void Idle( void )
+{
+ Zrot = 0.05 * glutGet(GLUT_ELAPSED_TIME);
+ glutPostRedisplay();
+}
+
+
+static void Display( void )
+{
+ int i;
+
+ glClear( GL_COLOR_BUFFER_BIT );
+
+ for (i = 0; i < NumObjects; i++) {
+ float x = 5.0 * ((float) i / (NumObjects-1) - 0.5);
+ glPushMatrix();
+ glTranslatef(x, 0, 0);
+ glRotatef(Xrot, 1, 0, 0);
+ glRotatef(Yrot, 0, 1, 0);
+ glRotatef(Zrot, 0, 0, 1);
+
+ DrawObject(Objects + i);
+
+ glPopMatrix();
+ }
+
+ CheckError(__LINE__);
+ glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+ float ar = (float) width / (float) height;
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+ glTranslatef( 0.0, 0.0, -15.0 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+ const GLfloat step = 3.0;
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 'a':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc(Idle);
+ else
+ glutIdleFunc(NULL);
+ break;
+ case 'z':
+ Zrot -= step;
+ break;
+ case 'Z':
+ Zrot += step;
+ break;
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void SpecialKey( int key, int x, int y )
+{
+ const GLfloat step = 3.0;
+ (void) x;
+ (void) y;
+ switch (key) {
+ case GLUT_KEY_UP:
+ Xrot -= step;
+ break;
+ case GLUT_KEY_DOWN:
+ Xrot += step;
+ break;
+ case GLUT_KEY_LEFT:
+ Yrot -= step;
+ break;
+ case GLUT_KEY_RIGHT:
+ Yrot += step;
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+
+static void MakeObject1(struct object *obj)
+{
+ GLfloat *v, *c;
+
+ glGenBuffersARB(1, &obj->BufferID);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, NULL, GL_STATIC_DRAW_ARB);
+ v = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_READ_WRITE_ARB);
+
+ /* Make rectangle */
+ v[0] = -1; v[1] = -1; v[2] = 0;
+ v[3] = 1; v[4] = -1; v[5] = 0;
+ v[6] = 1; v[7] = 1; v[8] = 0;
+ v[9] = -1; v[10] = 1; v[11] = 0;
+ c = v + 12;
+ c[0] = 1; c[1] = 0; c[2] = 0;
+ c[3] = 1; c[4] = 0; c[5] = 0;
+ c[6] = 1; c[7] = 0; c[8] = 1;
+ c[9] = 1; c[10] = 0; c[11] = 1;
+ obj->NumVerts = 4;
+ obj->VertexOffset = 0;
+ obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+
+ glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
+}
+
+
+static void MakeObject2(struct object *obj)
+{
+ GLfloat *v, *c;
+
+ glGenBuffersARB(1, &obj->BufferID);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, NULL, GL_STATIC_DRAW_ARB);
+ v = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_READ_WRITE_ARB);
+
+ /* Make triangle */
+ v[0] = -1; v[1] = -1; v[2] = 0;
+ v[3] = 1; v[4] = -1; v[5] = 0;
+ v[6] = 0; v[7] = 1; v[8] = 0;
+ c = v + 9;
+ c[0] = 0; c[1] = 1; c[2] = 0;
+ c[3] = 0; c[4] = 1; c[5] = 0;
+ c[6] = 1; c[7] = 1; c[8] = 0;
+ obj->NumVerts = 3;
+ obj->VertexOffset = 0;
+ obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+
+ glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
+}
+
+
+static void MakeObject3(struct object *obj)
+{
+ GLfloat *v, *c;
+
+ glGenBuffersARB(1, &obj->BufferID);
+ glBindBufferARB(GL_ARRAY_BUFFER_ARB, obj->BufferID);
+ glBufferDataARB(GL_ARRAY_BUFFER_ARB, 1000, NULL, GL_STATIC_DRAW_ARB);
+ v = (GLfloat *) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_READ_WRITE_ARB);
+
+ /* Make rectangle */
+ v[0] = -1; v[1] = -0.5; v[2] = 0;
+ v[3] = 1; v[4] = -0.5; v[5] = 0;
+ v[6] = 1; v[7] = 0.5; v[8] = 0;
+ v[9] = -1; v[10] = 0.5; v[11] = 0;
+ c = v + 12;
+ c[0] = 0; c[1] = 0; c[2] = 1;
+ c[3] = 0; c[4] = 0; c[5] = 1;
+ c[6] = 0; c[7] = 1; c[8] = 1;
+ c[9] = 0; c[10] = 1; c[11] = 1;
+ obj->NumVerts = 4;
+ obj->VertexOffset = 0;
+ obj->ColorOffset = 3 * sizeof(GLfloat) * obj->NumVerts;
+
+ glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
+}
+
+
+
+static void Init( void )
+{
+ if (!glutExtensionSupported("GL_ARB_vertex_buffer_object")) {
+ printf("GL_ARB_vertex_buffer_object not found!\n");
+ exit(0);
+ }
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+
+ MakeObject1(Objects + 0);
+ MakeObject2(Objects + 1);
+ MakeObject3(Objects + 2);
+ NumObjects = 3;
+}
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 600, 300 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutSpecialFunc( SpecialKey );
+ glutDisplayFunc( Display );
+ if (Anim)
+ glutIdleFunc(Idle);
+ Init();
+ glutMainLoop();
+ return 0;
+}
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