//
//  RenderableSphereEntityItem.cpp
//  interface/src
//
//  Created by Brad Hefta-Gaub on 8/6/14.
//  Copyright 2014 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#include <glm/gtx/quaternion.hpp>

#include <gpu/GPUConfig.h>

#include <DependencyManager.h>
#include <DeferredLightingEffect.h>
#include <PerfStat.h>

#include "RenderableSphereEntityItem.h"

EntityItem* RenderableSphereEntityItem::factory(const EntityItemID& entityID, const EntityItemProperties& properties) {
    return new RenderableSphereEntityItem(entityID, properties);
}

void RenderableSphereEntityItem::render(RenderArgs* args) {
    PerformanceTimer perfTimer("RenderableSphereEntityItem::render");
    assert(getType() == EntityTypes::Sphere);
    glm::vec3 position = getPosition();
    glm::vec3 center = getCenter();
    glm::vec3 dimensions = getDimensions();
    glm::quat rotation = getRotation();

    const float MAX_COLOR = 255.0f;
    glm::vec4 sphereColor(getColor()[RED_INDEX] / MAX_COLOR, getColor()[GREEN_INDEX] / MAX_COLOR,
                    getColor()[BLUE_INDEX] / MAX_COLOR, getLocalRenderAlpha());
                    
    glPushMatrix();
        glTranslatef(position.x, position.y, position.z);
        glm::vec3 axis = glm::axis(rotation);
        glRotatef(glm::degrees(glm::angle(rotation)), axis.x, axis.y, axis.z);
        
        
        glPushMatrix();
            glm::vec3 positionToCenter = center - position;
            glTranslatef(positionToCenter.x, positionToCenter.y, positionToCenter.z);

            glScalef(dimensions.x, dimensions.y, dimensions.z);
            
            // TODO: it would be cool to select different slices/stacks geometry based on the size of the sphere
            // and the distance to the viewer. This would allow us to reduce the triangle count for smaller spheres
            // that aren't close enough to see the tessellation and use larger triangle count for spheres that would
            // expose that effect
            const int SLICES = 15;
            const int STACKS = 15;
            DependencyManager::get<DeferredLightingEffect>()->renderSolidSphere(0.5f, SLICES, STACKS, sphereColor);
        glPopMatrix();
    glPopMatrix();
};