begin fixed point integer test

recon/screen_tests_c/main.c

@@ -0,0 +1,108 @@
+#include <stdio.h>
+#include <raylib.h>
+#include <raymath.h>
+
+#define RES_X 160
+#define RES_Y 80
+#define DEFAULT_CENTER_X 0
+#define DEFAULT_CENTER_Y 0
+#define MOUSE_BUTTON 0
+#define STEP_SIZE .25
+#define ZOOM_SIZE .25
+
+#define INFTY 4
+#define INFTY_SQR INFTY * INFTY
+#define ITERS 8
+
+struct camera {
+  double min_r, min_i, max_r, max_i;
+};
+
+//god damb maybe I shoulda made a vector class
+void shift_cam(struct camera *cam, double step_r, double step_i) {
+  double i_offset = (cam->max_i - cam->min_i) * step_i;
+  double r_offset = (cam->max_r - cam->min_r) * step_r;
+  cam->min_i += i_offset;
+  cam->max_i += i_offset;
+  cam->min_r += r_offset;
+  cam->max_r += r_offset;
+}
+
+void zoom_cam(struct camera *cam, double zoom) {
+  double i_scale = (cam->max_i - cam->min_i) * zoom;
+  double r_scale = (cam->max_r - cam->min_r) * zoom;
+  cam->min_i += i_scale;
+  cam->max_i -= i_scale;
+  cam->min_r += r_scale;
+  cam->max_r -= r_scale;
+}
+
+int main() {
+  int key_pressed;
+  struct camera cam = {
+    .min_r = -1,
+    .max_r = 1,
+    .min_i = -1,
+    .max_i = 1
+  };
+  InitWindow(160, 80, "mandelbrot fixed point test");
+
+  Image img = GenImageColor(RES_X, RES_Y, BLUE);
+  Texture tex = LoadTextureFromImage(img);
+
+  SetTargetFPS(30);
+  while(!WindowShouldClose()) {
+    if(key_pressed = GetKeyPressed()) {
+      switch(key_pressed) {
+        case KEY_UP:
+          shift_cam(&cam, 0, STEP_SIZE);
+          break;
+        case KEY_DOWN:
+          shift_cam(&cam, 0, -STEP_SIZE);
+          break;
+        case KEY_RIGHT:
+          shift_cam(&cam, STEP_SIZE, 0);
+          break;
+        case KEY_LEFT:
+          shift_cam(&cam, -STEP_SIZE, 0);
+          break;
+        case KEY_W:
+          printf("a\n");
+          zoom_cam(&cam, ZOOM_SIZE);
+          break;
+        case KEY_S:
+          zoom_cam(&cam, -ZOOM_SIZE);
+          break;
+        default:
+          break;
+      }
+      printf("(%f, %f) - (%f, %f)\n", cam.min_r, cam.min_i, cam.max_r, cam.max_i);
+    }
+    {
+      double scale_i = (cam.max_i - cam.min_i) / (double)GetScreenHeight();
+      double scale_r = (cam.max_r - cam.min_r) / (double)GetScreenWidth();
+      double c_i = cam.min_i;
+      double c_r = cam.min_r;
+      double z_i = 0;
+      double z_r = 0;
+      for(int y = 0; y < RES_Y; y++) {
+        for(int x = 0; x < RES_Y; x++) {
+          for(int i = 0; i < ITERS; i++) {
+
+            if(pow(c_i, 2) + pow(c_r, 2) >= INFTY_SQR) {
+              break;
+            }
+          }
+          c_r += scale_r;
+        }
+        c_i += scale_i;
+      }
+    }
+
+    BeginDrawing();
+    DrawTexture(tex, 0, 0, WHITE);
+    EndDrawing();
+  }
+
+  return 0;
+}

recon/screen_tests_c/makefile

@@ -0,0 +1,6 @@
+.default: make
+make:
+	gcc main.c -o mandelbrot -lraylib
+
+clean:
+	rm -f mandelbrot