Simulation::Simulation(std::string inputFile) {
tex = Texture2D::createFromFile(inputFile,Texture::RGBA,Texture::UNSIGNED_BYTE,Texture::RGBA8);
WIDTH = tex->getWidth();
HEIGHT = tex->getHeight();
Texture2D* tex2 = Texture2D::createEmpty(WIDTH,HEIGHT,Texture::RGBA8);
tex->setFilter(GL_NEAREST, GL_NEAREST);
tex2->setFilter(GL_NEAREST, GL_NEAREST);
RenderTarget* simTarget = new RenderTarget(WIDTH, HEIGHT);
simTarget->addCustomTexture(RenderTarget::COLOR0, tex2);
Model model;
model.mesh = Meshes.get("quad");
model.program = Programs.get("simulation");
model.program->uniform("width")->set(WIDTH);
model.program->uniform("height")->set(HEIGHT);
data = new unsigned char[WIDTH*HEIGHT*NUM_FRAMES*4];
//simulate
int current = 0;
RenderTarget* curr = RenderTarget::getCurrent();
RenderTarget::bind(simTarget);
GL_ASSERT(glBlendFunc(GL_ONE,GL_ONE));
GL_ASSERT(glClear(GL_COLOR_BUFFER_BIT));
for(int i = 0; i < NUM_FRAMES; ++i) {
current == 0? tex->bind() : tex2->bind();
GL_ASSERT(glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, &data[WIDTH*HEIGHT*4*(NUM_FRAMES-1-i)]));
model.program->uniform("input")->set(current==0?tex:tex2);
current = (current+1)%2;
simTarget->setCustomTexture(RenderTarget::COLOR0, current==0?tex:tex2);
GL_ASSERT(glClear(GL_COLOR_BUFFER_BIT));
model.draw();
}
RenderTarget::bind(curr);
//set at start
setFrame(0);
//clean up
delete simTarget;
delete tex2;
}
