update readme

Reviewed-on: #3

.gitignore

@@ -41,3 +41,5 @@ debug
 build
 debug
 .cache
+tmp
+screenshot*

README.md

@@ -1,6 +1,6 @@
 # polypartiCL
 
-Naive photon simulator with SYCL and [raylib](https://raylib.com)
+Naive photon simulator using [SYCL](https://khronos.org/sycl/) and [raylib](https://raylib.com)
 
 This project uses the [raylib-cpp](https://robloach.github.io/raylib-cpp) wrapper library and is provided in the /include directory.
 raylib-cpp is licensed under an unmodified zlib/libpng license. A copy of this license is provided at /include/LICENSE.
@@ -8,12 +8,21 @@ raylib-cpp is licensed under an unmodified zlib/libpng license. A copy of this l
 cmake assumes icpx and the [Intel OneAPI](https://www.intel.com/content/www/us/en/developer/tools/oneapi/overview.html) environment is installed.
 You'll need these even if you don't compile with cmake until SYCL gets native LLVM support.
 
+All simulation code uses single-precision floating point arithmetic to ensure compatability with (integrated) graphics packages that do not support 64-bit floating point.
+
 polypartiCL is licensed with the 3-clause BSD license.
 
 ## Todo
+- Reduce corner escaping
+    - Ability limited by f32 precision
 - Rewrite & optimize simulation code, store all points/velocites in one array and submit once
     - Consider modelling each particle and all its relevant data points individually
     - Submit each relevant data point by pointer offset, size of struct is irrelevant as long as it is constant, only necessary data will be submitted to kernel
 - Add linear beams
 - Add environment objects / multiple rooms per screen
 - Add timed events
+- Add compile option for 64-bit floating point simulation
+
+![Screenshot 1](https://alexlardner.com/img/1.png)
+![Screenshot 2](https://alexlardner.com/img/2.png)
+![Screenshot 3](https://alexlardner.com/img/3.png)

src/main.cpp

@@ -67,6 +67,8 @@ int main(int argc, char* argv[]) {
     raylib::Vector2 mouse_i, mouse_f, mouse_d;
     raylib::Vector2 midpoint(screenWidth * 0.5, screenHeight * 0.5);
 
+    raylib::Image screenshot(screenWidth, screenHeight, WHITE);
+
 
     float dirH[2] = {1.0f, 0.0f};
     float dirV[2] = {0.0f, 1.0f};
@@ -89,6 +91,10 @@ int main(int argc, char* argv[]) {
         if (IsKeyPressed(KEY_B)) useShader = !useShader;
         if (IsKeyPressed(KEY_SPACE)) paused = !paused;
         if (IsKeyPressed(KEY_T)) sim.reverseInterval();
+        if (IsKeyPressed(KEY_S)) {
+            screenshot.LoadFromScreen();
+            screenshot.ExportAsCode("screenshot" + std::to_string(window.GetTime()));
+        }
 
         if (!paused) {
             sim.updateFields(window.GetTime());