Remove compile_commands.json

.gitignore

@@ -1,2 +1,4 @@
 main
+result.m4v
 .cache
+compile_commands.json

compile_commands.json

@@ -1,81 +0,0 @@
-[
-  {
-    "arguments": [
-      "/usr/bin/clang",
-      "-c",
-      "-g",
-      "-o",
-      "main",
-      "main.c"
-    ],
-    "directory": "/home/abdelrahman/Sources/programming/starfield",
-    "file": "/home/abdelrahman/Sources/programming/starfield/main.c",
-    "output": "/home/abdelrahman/Sources/programming/starfield/main"
-  },
-  {
-    "arguments": [
-      "/usr/bin/clang-15",
-      "-cc1",
-      "-triple",
-      "x86_64-pc-linux-gnu",
-      "-emit-obj",
-      "-mrelax-all",
-      "--mrelax-relocations",
-      "-disable-free",
-      "-clear-ast-before-backend",
-      "-disable-llvm-verifier",
-      "-discard-value-names",
-      "-main-file-name",
-      "-mrelocation-model",
-      "pic",
-      "-pic-level",
-      "2",
-      "-pic-is-pie",
-      "-mframe-pointer=all",
-      "-fmath-errno",
-      "-ffp-contract=on",
-      "-fno-rounding-math",
-      "-mconstructor-aliases",
-      "-funwind-tables=2",
-      "-target-cpu",
-      "x86-64",
-      "-tune-cpu",
-      "generic",
-      "-mllvm",
-      "-treat-scalable-fixed-error-as-warning",
-      "-debug-info-kind=constructor",
-      "-dwarf-version=5",
-      "-debugger-tuning=gdb",
-      "-fcoverage-compilation-dir=/home/abdelrahman/Sources/programming/starfield",
-      "-resource-dir",
-      "/usr/lib/clang/15.0.7",
-      "-internal-isystem",
-      "/usr/lib/clang/15.0.7/include",
-      "-internal-isystem",
-      "/usr/local/include",
-      "-internal-isystem",
-      "/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.2.1/../../../../x86_64-pc-linux-gnu/include",
-      "-internal-externc-isystem",
-      "/include",
-      "-internal-externc-isystem",
-      "/usr/include",
-      "-fdebug-compilation-dir=/home/abdelrahman/Sources/programming/starfield",
-      "-ferror-limit",
-      "19",
-      "-stack-protector",
-      "2",
-      "-fgnuc-version=4.2.1",
-      "-fcolor-diagnostics",
-      "-faddrsig",
-      "-D__GCC_HAVE_DWARF2_CFI_ASM=1",
-      "-x",
-      "c",
-      "-o",
-      "/tmp/main-118336.o",
-      "main.c"
-    ],
-    "directory": "/home/abdelrahman/Sources/programming/starfield",
-    "file": "/home/abdelrahman/Sources/programming/starfield/main.c",
-    "output": "/tmp/main-118336.o"
-  }
-]

main.c

@@ -1,5 +1,6 @@
 #include "aliases.h"
 #include <SDL2/SDL.h>
+#include <SDL2/SDL_keycode.h>
 #include <SDL2/SDL_pixels.h>
 #include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
@@ -8,10 +9,8 @@
 #include <SDL2/SDL_video.h>
 #include <math.h>
 #include <stdbool.h>
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <string.h>
 #include <time.h>
 
 #define WINDOW_WIDTH 800
@@ -29,6 +28,13 @@
 
 #define PROJECTION_PLANE 1.0
 
+#define RAD(DEG) ((DEG * M_PI) / 180.0)
+#define DEG(RAD) ((RAD * 180.0) / M_PI)
+
+#define FOV_MIN 1.0
+#define FOV_MAX 170.0
+#define FOV_INC 3.0
+
 typedef struct {
   u32 x;
   u32 y;
@@ -61,7 +67,7 @@ void init_starfield(vec3f_t *stars, u32 count, i32 spread);
 void update_startfield(vec3f_t *stars, u32 count, i32 spread, u32 speed,
                        f64 delta);
 void render_starfield(SDL_Surface *surface, vec3f_t *stars, u32 count,
-                      i32 spread, f64 aov);
+                      i32 spread, f64 fov);
 
 int main(void) {
   srand(time(NULL));
@@ -86,6 +92,7 @@ int main(void) {
   init_starfield(stars, STAR_COUNT, STAR_SPREAD);
 
   f64 delta = 1.0 / 60.0; // constant delta
+  f64 fov = 60.0;
 
   while (running) {
     while (SDL_PollEvent(&event)) {
@@ -93,6 +100,26 @@ int main(void) {
       case SDL_QUIT:
         running = false;
         break;
+      case SDL_KEYDOWN:
+        switch (event.key.keysym.sym) {
+        case SDLK_UP:
+          fov -= FOV_INC;
+
+          if (fov < FOV_MIN) {
+            fov = FOV_MIN;
+          }
+
+          break;
+        case SDLK_DOWN:
+          fov += FOV_INC;
+
+          if (fov > FOV_MAX) {
+            fov = FOV_MAX;
+          }
+
+          break;
+        }
+        break;
       }
     }
 
@@ -100,16 +127,15 @@ int main(void) {
 
     render_clear(canvas, BG_COLOR);
 
-    u32 scalar = 10;
-    vec2i_t pos;
-
-    render_starfield(canvas, stars, STAR_COUNT, STAR_SPREAD, 60.0);
+    render_starfield(canvas, stars, STAR_COUNT, STAR_SPREAD, fov);
 
     SDL_BlitSurface(canvas, NULL, surface, NULL);
 
     SDL_UpdateWindowSurface(window);
   }
 
+  SDL_FreeSurface(canvas);
+
   SDL_DestroyWindow(window);
 
   SDL_Quit();
@@ -219,17 +245,19 @@ void update_startfield(vec3f_t *stars, u32 count, i32 spread, u32 speed,
 }
 
 void render_starfield(SDL_Surface *surface, vec3f_t *stars, u32 count,
-                      i32 spread, f64 aov) {
+                      i32 spread, f64 fov) {
   vec2f_t projected[count];
   vec2i_t coords;
 
+  f64 tangent = tan(RAD(fov * 0.5));
+
   for (u32 i = 0; i < count; ++i) {
     if (stars[i].z == 0.0) {
       continue;
     }
 
-    projected[i] =
-        (vec2f_t){.x = stars[i].x / stars[i].z, .y = stars[i].y / stars[i].z};
+    projected[i] = (vec2f_t){.x = stars[i].x / stars[i].z / tangent,
+                             .y = stars[i].y / stars[i].z / tangent};
 
     if (projected[i].x < NORMALISED_MIN || projected[i].x > NORMALISED_MAX ||
         projected[i].y < NORMALISED_MIN || projected[i].y > NORMALISED_MAX ||