void drawCube(float size, float x, float y, float z)
{
// Colour cube data.
int i;
const GLfloat cube_vertices [8][3] = {
/* +z */ {0.5f, 0.5f, 0.5f}, {0.5f, -0.5f, 0.5f}, {-0.5f, -0.5f, 0.5f}, {-0.5f, 0.5f, 0.5f},
/* -z */ {0.5f, 0.5f, -0.5f}, {0.5f, -0.5f, -0.5f}, {-0.5f, -0.5f, -0.5f}, {-0.5f, 0.5f, -0.5f} };
const GLubyte cube_vertex_colors [8][4] = {
{255, 255, 255, 255}, {255, 255, 0, 255}, {0, 255, 0, 255}, {0, 255, 255, 255},
{255, 0, 255, 255}, {255, 0, 0, 255}, {0, 0, 0, 255}, {0, 0, 255, 255} };
const GLushort cube_faces [6][4] = { /* ccw-winding */
/* +z */ {3, 2, 1, 0}, /* -y */ {2, 3, 7, 6}, /* +y */ {0, 1, 5, 4},
/* -x */ {3, 0, 4, 7}, /* +x */ {1, 2, 6, 5}, /* -z */ {4, 5, 6, 7} };
glPushMatrix(); // Save world coordinate system.
glTranslatef(x, y, z);
glScalef(size, size, size);
glStateCacheDisableLighting();
glStateCacheDisableTex2D();
glStateCacheDisableBlend();
glColorPointer(4, GL_UNSIGNED_BYTE, 0, cube_vertex_colors);
glVertexPointer(3, GL_FLOAT, 0, cube_vertices);
glStateCacheEnableClientStateVertexArray();
glEnableClientState(GL_COLOR_ARRAY);
for (i = 0; i < 6; i++) {
glDrawElements(GL_TRIANGLE_FAN, 4, GL_UNSIGNED_SHORT, &(cube_faces[i][0]));
}
glDisableClientState(GL_COLOR_ARRAY);
glColor4ub(0, 0, 0, 255);
for (i = 0; i < 6; i++) {
glDrawElements(GL_LINE_LOOP, 4, GL_UNSIGNED_SHORT, &(cube_faces[i][0]));
}
glPopMatrix(); // Restore world coordinate system.
}
void VirtualEnvironmentHandleARViewDrawPreCamera(void)
{
if (!VirtualEnvironment_AROSG)
return;
#ifdef USE_OPENGL_ES
// Set some state to OSG's expected values.
glStateCacheDisableLighting();
glStateCacheDisableTex2D();
glStateCacheDisableBlend();
glStateCacheEnableClientStateVertexArray();
glStateCacheEnableClientStateNormalArray();
glStateCacheEnableClientStateTexCoordArray();
#endif
// Save the projection and modelview state.
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// Draw the whole scenegraph.
arOSGDraw(VirtualEnvironment_AROSG);
// OSG modifies the viewport, so restore it.
// Also restore projection and modelview.
glViewport(viewPort[viewPortIndexLeft], viewPort[viewPortIndexBottom], viewPort[viewPortIndexWidth], viewPort[viewPortIndexHeight]);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
#ifdef USE_OPENGL_ES
// Flush the state cache and ensure depth testing is enabled.
glStateCacheFlush();
glStateCacheEnableDepthTest();
#else
// Ensure depth testing is re-enabled.
glEnable(GL_DEPTH_TEST);
#endif
}
