From 3c487c5cd69c53d6fea948643c0a76df03516605 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Fri, 1 Apr 2022 21:23:39 +0200
Subject: Moved Stars45 to StarsEx

---
 StarsEx/DriveSprite.cpp | 141 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 StarsEx/DriveSprite.cpp

(limited to 'StarsEx/DriveSprite.cpp')

diff --git a/StarsEx/DriveSprite.cpp b/StarsEx/DriveSprite.cpp
new file mode 100644
index 0000000..804ef4b
--- /dev/null
+++ b/StarsEx/DriveSprite.cpp
@@ -0,0 +1,141 @@
+/*  Starshatter: The Open Source Project
+    Copyright (c) 2021-2022, Starshatter: The Open Source Project Contributors
+    Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
+    Copyright (c) 1997-2006, Destroyer Studios LLC.
+
+    AUTHOR:       John DiCamillo
+
+
+    OVERVIEW
+    ========
+    Sprite for rendering drive flares.  Remains visible at extreme ranges.
+*/
+
+#include "DriveSprite.h"
+
+#include "Bitmap.h"
+#include "Camera.h"
+#include "Scene.h"
+#include "Video.h"
+
+// +--------------------------------------------------------------------+
+
+DriveSprite::DriveSprite()
+    : Sprite(), glow(0), effective_radius(0), front(0,0,0), bias(0)
+{ luminous = true; }
+
+DriveSprite::DriveSprite(Bitmap* animation, Bitmap* g)
+    : Sprite(animation), glow(g), effective_radius(0), front(0,0,0), bias(0)
+{ luminous = true; }
+
+DriveSprite::DriveSprite(Bitmap* animation, int length, int repeat, int share)
+    : Sprite(animation, length, repeat, share), glow(0), effective_radius(0),
+      front(0,0,0), bias(0)
+{ luminous = true; }
+
+DriveSprite::~DriveSprite()
+{ }
+
+// +--------------------------------------------------------------------+
+
+void
+DriveSprite::SetFront(const Vec3& f)
+{
+    front = f;
+    front.Normalize();
+}
+
+void
+DriveSprite::SetBias(DWORD b)
+{
+    bias = b;
+}
+
+// +--------------------------------------------------------------------+
+
+void
+DriveSprite::Render(Video* video, DWORD flags)
+{
+    if (!video || ((flags & RENDER_ADDITIVE) == 0))
+    return;
+
+    if (shade > 0  && !hidden && (life > 0 || loop)) {
+        const Camera*  cam = video->GetCamera();
+        bool           z_disable = false;
+
+        if (bias)
+        video->SetRenderState(Video::Z_BIAS, bias);
+
+        if (front.length()) {
+            Point test = loc;
+
+            if (scene && cam) {
+                Vec3   dir = front;
+
+                double intensity = cam->vpn() * dir * -1;
+                double distance  = Point(cam->Pos() - test).length();
+
+                if (intensity > 0.05) {
+                    if (!scene->IsLightObscured(cam->Pos(), test, 8)) {
+                        video->SetRenderState(Video::Z_ENABLE, false);
+                        z_disable = true;
+
+                        if (glow) {
+                            intensity = pow(intensity, 3);
+
+                            if (distance > 5e3)
+                            intensity *= (1 - (distance-5e3)/45e3);
+
+                            if (intensity > 0) {
+                                Bitmap*  tmp_frame   = frames;
+                                double   tmp_shade   = shade;
+                                int      tmp_w       = w;
+                                int      tmp_h       = h;
+
+                                if (glow->Width() != frames->Width()) {
+                                    double   wscale      = glow->Width()   / frames->Width();
+                                    double   hscale      = glow->Height()  / frames->Height();
+
+                                    w = (int) (w * wscale);
+                                    h = (int) (h * hscale);
+                                }
+
+                                shade  = intensity;
+                                frames = glow;
+
+                                Sprite::Render(video, flags);
+
+                                frames = tmp_frame;
+                                shade  = tmp_shade;
+                                w      = tmp_w;
+                                h      = tmp_h;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        if (effective_radius-radius > 0.1) {
+            double scale_up = effective_radius / radius;
+            int tmp_w = w;
+            int tmp_h = h;
+
+            w = (int) (w * scale_up);
+            h = (int) (h * scale_up);
+
+            Sprite::Render(video, flags);
+
+            w = tmp_w;
+            h = tmp_h;
+        }
+
+        else {
+            Sprite::Render(video, flags);
+        }
+
+        if (bias)      video->SetRenderState(Video::Z_BIAS,   0);
+        if (z_disable) video->SetRenderState(Video::Z_ENABLE, true);
+    }
+}
+
-- 
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