/** Rotate random slices of the Rubik's cube */
void randomRotations(int numRotations) {
for (int i=0; i<numRotations; i++) {
int r = rand() % NUM_PLANES;
rotateSlice(positions,r/3,r%3,rand()%2);
rotationProgress = 1.0f;
updateRotationProgress();
}
}
void GameCamera::update(
const glm::vec3 & position,
const glm::vec3 & direction,
float seconds,
float normalizedCaveDistance)
{
updateRotationProgress(seconds);
updateLookAt(position, direction, normalizedCaveDistance);
}
void display() {
glClearColor(0.5, 0.5, 0.5, 1.0);
glClearDepth(1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glBindVertexArray(vao);
// Pass info about the rotation/scale of the entire Rubik's cube
glUniformMatrix4fv(uRotationMat, 1, 0, rotationMat);
glUniform1f(uScale,scale);
updateRotationProgress();
// Let the vertex shader handle all the angle calculations
glUniform1f(uRotationProgress,rotationProgress);
// Draw 27 cubes based on initial cube
glClearStencil(0);
glStencilMask(0xFF);
glEnable(GL_STENCIL_TEST);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
for (int i=0; i<NUM_CUBES; i++) {
// Stencil buffer:
// http://en.wikibooks.org/wiki/OpenGL_Programming/Object_selection
glStencilFunc(GL_ALWAYS, i+1, 0xFF); // i+1 because 0 is used for background
glUniform1i(uCubeId,i);
glUniform1i(uPositions,positions[i]);
glUniform1iv(uColors,FACES_PER_CUBE,colors[i]);
glUniform1i(uRotationAxes,rotationAxes[i]);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glDrawElements(GL_TRIANGLES, VERT_PER_CUBE, GL_UNSIGNED_SHORT, 0);
}
glBindVertexArray(0);
glutSwapBuffers();
}