Add Flame effect behind player's ship

src/Models/Flames.zig

@@ -0,0 +1,39 @@
+const std = @import("std");
+const raylib = @import("raylib");
+const Shared = @import("../Shared.zig").Shared;
+
+pub const Flames = struct {
+    var frame: f32 = 0;
+
+    pub inline fn Draw(
+        position: raylib.Rectangle,
+        rotation: f32,
+    ) void {
+        if (frame == std.math.floatMax(f32)) {
+            frame = 0;
+        }
+        frame += raylib.getFrameTime();
+
+        const fireTexture = Shared.Texture.Get(.Fire);
+
+        const waveShader = Shared.Shader.Get(.Wave);
+        const waveShaderLoc = raylib.getShaderLocation(waveShader, "seconds");
+        raylib.setShaderValue(waveShader, waveShaderLoc, &frame, @intFromEnum(raylib.ShaderUniformDataType.shader_uniform_float));
+        waveShader.activate();
+        defer waveShader.deactivate();
+
+        raylib.drawTexturePro(
+            fireTexture,
+            raylib.Rectangle.init(
+                0,
+                0,
+                @as(f32, @floatFromInt(fireTexture.width)),
+                @as(f32, @floatFromInt(fireTexture.height)),
+            ),
+            position,
+            raylib.Vector2.init(position.width / 2, position.height),
+            rotation,
+            Shared.Color.White.alpha(0.75),
+        );
+    }
+};

src/Models/Player.zig

@@ -4,6 +4,7 @@ const raylib_math = @import("raylib-math");
 const Shared = @import("../Shared.zig").Shared;
 const Shoot = @import("./Shoot.zig").Shoot;
 const Alien = @import("./Alien.zig").Alien;
+const Flames = @import("./Flames.zig").Flames;
 
 pub const Player = struct {
     position: raylib.Vector2,
@@ -208,6 +209,16 @@ pub const Player = struct {
         const shipTexture = Shared.Texture.Get(.Ship);
         const shipWidthF = @as(f32, @floatFromInt(shipTexture.width));
         const shipHeightF = @as(f32, @floatFromInt(shipTexture.height));
+
+        if (Shared.Input.Up_Held()) {
+            Flames.Draw(raylib.Rectangle.init(
+                self.position.x,
+                self.position.y,
+                base_size,
+                (base_size * 2) * self.acceleration,
+            ), self.rotation - 180);
+        }
+
         raylib.drawTexturePro(
             shipTexture,
             raylib.Rectangle.init(0, 0, shipWidthF, shipHeightF),

src/Shaders/Wave.fs

@@ -16,10 +16,10 @@ uniform vec2 size;
 
 float freqX = 25.0;
 float freqY = 25.0;
-float ampX = 20.0;
-float ampY = 20.0;
-float speedX = 4.0;
-float speedY = 4.0;
+float ampX = 40.0;
+float ampY = 40.0;
+float speedX = 8.0;
+float speedY = 8.0;
 
 void main() {
     float pixelWidth = 1.0 / size.x;