KlassischeKeplerKriege/game/renderer_polygon_3d/renderer_polygon_3d.cpp

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#include "renderer_polygon_3d.hpp"
#include <iostream>
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#include <glm/gtc/type_ptr.hpp>
#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtx/euler_angles.hpp>
#include <glm/gtc/random.hpp>
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namespace endofthejedi {
void RendererPolygon3d::setup()
{
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m_lastTime = -1.0;
std::cout<<"setup polygon 3d" << std::endl;
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m_shader.init();
#if 0
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std::string vss_simple = "../data/shader/simple.vert";
std::string fss_simple = "../data/shader/simple.frag";
m_shader.loadFile(vss_simple, GL_VERTEX_SHADER);
m_shader.loadFile(fss_simple, GL_FRAGMENT_SHADER);
#else
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std::string vss_game_objects = "../data/shader/gameobjects.vert";
std::string fss_game_objects = "../data/shader/gameobjects.frag";
m_shader.loadFile(vss_game_objects, GL_VERTEX_SHADER);
m_shader.loadFile(fss_game_objects, GL_FRAGMENT_SHADER);
#endif
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addModel("../data/mesh/small_atomic_bomb.stl", &m_missileModel);
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addModel("../data/mesh/planet_12.stl", &m_planetModel);
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addModel("../data/mesh/ship_ufo.stl", &m_shipModel);
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}
void RendererPolygon3d::render(const game::State *state)
{
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if (m_lastTime == -1.0) {
m_lastTime = state->timestamp();
}
float dt = state->timestamp() - m_lastTime;
if (dt < 0.0) {
dt = 0.0;
}
m_state = state;
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advanceGraphicObjects(dt);
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// TODO: add stars (texture)
// TODO: add dust particles
// TODO: add little rocks flying around
glClearColor(0.0, 0.0, 0.0, 1.0);
//float s = 0.1;
//glClearColor(s, s, s, 1.0);
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m_shader.bind();
// TODO: add ONE sun planet
// TODO: add lights for explosions
glm::vec3 c = glm::vec3(1.0, 1.0, 0.8);
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glUniform3f(m_shader.location("lightColor"), c.x, c.y, c.z);
glm::vec3 p = glm::vec3(0.3f, 0.4f, 0.0f);
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glUniform3f(m_shader.location("lightPosition"), p.x, p.y, p.z);
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renderPlanets();
renderShips();
renderMissiles();
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renderParticles();
renderTraces();
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//glColor3f(1.0, 0.0, 0.0);
//glBegin(GL_QUADS);
//glVertex2f(-1.0f, -1.0f);
//glVertex2f(1.0f, -1.0f);
//glVertex2f(1.0f, 1.0f);
//glVertex2f(-1.0f, 1.0f);
//glEnd();
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m_lastTime = state->timestamp();
}
void RendererPolygon3d::renderParticles()
{
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for (ParticleBatch *batch : m_particles) {
batch->bind();
batch->render();
}
}
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void RendererPolygon3d::addExplosionEffect(size_t id, const glm::vec2 &pos, size_t n, float duration)
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{
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//float particleRadius = 0.005;
//float particleRadius = 0.003;
float particleRadius = 0.005;
// TODO: use this as shader input too and make the area 2x around this
// so that it stays hot/yellow for 2/3 of the time
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float explCoreSize = 0.02f;
float maxVelocity = 0.4f;
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ParticleBatch *batch = new ParticleBatch(id, n, particleRadius, duration);
batch->setCenter(glm::vec3(pos, 0.0));
batch->setMaxVelocity(maxVelocity);
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for (size_t i=0; i<n; i++) {
// distribute in a circle
//float t = 2.0 * M_PI * i / (float) n;
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//t += 0.2*util::randf_m1_1();
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// with random velocities
// this is 3d because it looks better if some particles leave/enter
// the space and they are not all on one plane.
// especially in 3d this would look bad without 3d velocity vector.
//glm::vec3 v = 0.5f*glm::vec3(sin(t), cos(t), util::randf_m1_1());
glm::vec3 v = glm::ballRand(maxVelocity);
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v *= util::randf_0_1() * util::randf_0_1() * util::randf_0_1();
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batch->setParticle(i, glm::vec3(pos, 0.0) + glm::ballRand(explCoreSize), v);
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}
batch->upload();
m_particles.push_back(batch);
}
void RendererPolygon3d::advanceGraphicObjects(float dt)
{
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for (const game::Explosion *expl : m_state->explosions) {
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bool gotIt = false;
for (ParticleBatch *batch : m_particles) {
if (batch->id() == expl->id) {
gotIt = true;
break;
}
}
if (!gotIt) {
addExplosionEffect(expl->id, expl->position, 1000, 1.0);
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}
}
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//if (m_particles.size() == 0) {
// addExplosionEffect(0, glm::vec2(0.0, 0.0), 1000, 2.0);
//}
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std::vector<ParticleBatch*> rm;
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for (ParticleBatch *batch : m_particles) {
batch->tick(dt);
if (batch->done()) {
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rm.push_back(batch);
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}
}
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for (ParticleBatch *batch : rm) {
m_particles.remove(batch);
delete(batch);
}
}
void RendererPolygon3d::renderPlanets()
{
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m_planetModel->bind();
for (const game::Planet *planet : m_state->planets) {
glm::mat4 model = computeModelMatrix(planet);
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glUniformMatrix4fv(m_shader.location("model"), 1, GL_FALSE, glm::value_ptr(model));
glm::vec3 c = planet->getColor();
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glUniform3f(m_shader.location("materialColor"), c.x, c.y, c.z);
glUniform3f(m_shader.location("color"), c.x, c.y, c.z);
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m_planetModel->render();
}
}
void RendererPolygon3d::renderMissiles()
{
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m_missileModel->bind();
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for (const game::Player *player : m_state->players) {
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for (const game::Missile *missile : player->missiles) {
glm::vec3 c = glm::vec3(1.0, 1.0, 0.3);
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glUniform3f(m_shader.location("materialColor"), c.x, c.y, c.z);
glm::mat4 model = computeModelMatrix(missile);
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glUniformMatrix4fv(m_shader.location("model"), 1, GL_FALSE, glm::value_ptr(model));
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m_missileModel->render();
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}
}
}
void RendererPolygon3d::renderShips()
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{
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m_shipModel->bind();
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for (const game::Ship *ship : m_state->ships) {
glm::mat4 model = computeModelMatrix(ship);
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glUniformMatrix4fv(m_shader.location("model"), 1, GL_FALSE, glm::value_ptr(model));
glm::vec3 c = glm::vec3(0.1, 1.0, 0.2);
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glUniform3f(m_shader.location("materialColor"), c.x, c.y, c.z);
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m_shipModel->render();
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}
}
void RendererPolygon3d::addModel(const std::string &filename, PolygonModel **dest)
{
//std::cout<<"adding a model: " << filename << std::endl;
*dest = new PolygonModel(filename);
if (!(*dest)->import()) {
std::cout<<"error: failed to load needed model!!!" << std::endl << std::endl;
exit(-1);
}
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(*dest)->setup(&m_shader);
(*dest)->uploadToOpenGl();
m_models.push_back(*dest);
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}
glm::mat4 RendererPolygon3d::computeModelMatrix(const game::Planet *planet)
{
return computeModelMatrix(planet->position, planet->radius);
}
glm::mat4 RendererPolygon3d::computeModelMatrix(const game::Missile *missile)
{
glm::vec2 vn = glm::normalize(missile->velocity);
float a = std::atan2(vn.y, vn.x);
// TODO: which visual size has the rocket? in game its just a point with
// no size because all others have size.
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return computeModelMatrix(missile->position, 0.03f, a);
}
glm::mat4 RendererPolygon3d::computeModelMatrix(const game::Ship *ship)
{
// TODO: rotate them before shooting, that looks better
glm::mat4 mat = computeModelMatrix(ship->position, m_state->shipRadius());
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// XXX model is flipped
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//glm::mat4 mat = computeModelMatrix(ship->position, 0.3);
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mat = glm::rotate(mat, (float) M_PI, glm::vec3(0.0f, 1.0f, 0.0f));
return mat;
}
glm::mat4 RendererPolygon3d::computeModelMatrix(const glm::vec2 &pos, float scale, float angle)
{
// init as identity matrix
glm::mat4 model;
model = glm::translate(model, glm::vec3(pos, 0.0));
if (scale != 1.0) {
model = glm::scale(model, glm::vec3(scale));
}
if (angle != 0.0) {
model = glm::rotate(model, angle, glm::vec3(0.0f, 0.0f, 1.0f));
}
return model;
}
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void RendererPolygon3d::renderTraces()
{
// revert to default
glUseProgram(0);
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// TODO dont use line mode. make that with own quads
glPolygonMode(GL_FRONT, GL_LINE);
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for (const game::Trace *trace : m_state->traces) {
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float fade_out = 1.0;
if (trace->missile == nullptr) {
fade_out = 1.0 - (trace->age / trace->maxAge);
}
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glColor3f(0.0, 0.5*fade_out, 0.5*fade_out);
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glBegin(GL_LINE_STRIP);
for (const game::Trace::TracePoint &tp : trace->points) {
glVertex2f(tp.position.x, tp.position.y);
}
glEnd();
}
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glPolygonMode(GL_FRONT, GL_FILL);
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}
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}