removed unnecessary imgui install

src/gui/MainWindow.cpp

@@ -10,6 +10,21 @@
 #include "cuda_error.h"
 
 
+void Window::saveImage() {
+  unsigned char* pixels = new unsigned char[this->w * this->h * 3];
+  glReadPixels(0, 0, this->w, this->h, GL_RGB, GL_UNSIGNED_BYTE, pixels);
+  const char* filename = "output.ppm"; // TODO: make this the current time
+
+  std::ofstream imageFile(filename, std::ios::out | std::ios::binary);
+  imageFile << "P6\n" << this->w << " " << this->h << "\n255\n";
+  for (int i = 0; i < this->w * this->h * 3; i++) {
+      imageFile << pixels[i];
+  }
+  imageFile.close();
+
+  delete[] pixels;
+}
+
 Window::Window(unsigned int w, unsigned int h) {
   this->w = w;
   this->h = h;
@@ -111,6 +126,10 @@ void Window::tick() {
     // TODO: Load new date file here
     this->widget->dateChanged = false;
   }
+  if (this->widget->saveImage) {
+    saveImage();
+    this->widget->saveImage = false;
+  }
   
   // tick render
 	glBindFramebuffer(GL_FRAMEBUFFER, 0);

src/gui/MainWindow.h

@@ -22,6 +22,7 @@ public:
   int init(float* data);
   void free(float* data);
   void resize(unsigned int w, unsigned int h);
+  void saveImage();
 
 private:
   GLFWwindow* window;

src/gui/input/Widget.cpp

@@ -58,6 +58,7 @@ Widget::Widget(GLFWwindow* window) :
   dateChanged(false),
   paused(true),
   renderOnce(false),
+  saveImage(false),
   bgColor(Color3::init(0.1f, 0.1f, 0.1f)),
   date(301),
   samplesPerPixel(1),
@@ -171,6 +172,7 @@ void Widget::tick(double fps) {
   ImGui::SameLine();
   ImGui::Text(this->dateString);
   ImGui::DragInt("Samples per pixel", &this->samplesPerPixel, 1, 1, 16, "%d", ImGuiSliderFlags_AlwaysClamp);
+  if (ImGui::Button("Save render")) this->saveImage = true;
   ImGui::End();
 
 

src/gui/input/Widget.h

@@ -12,6 +12,7 @@ class Widget {
 public:
   bool paused;
   bool dateChanged;
+  bool saveImage;
   int date;
 
   void tick(double fps);