Split math functions; beginning of common structures

2 files changed, 181 insertions, 0 deletions

diff --git a/src/graphics/common/color.cpp b/src/graphics/common/color.cpp
new file mode 100644
index 0000000..35f6596
--- /dev/null
+++ b/src/graphics/common/color.cpp
@@ -0,0 +1,150 @@
+// * This file is part of the COLOBOT source code
+// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
+// *
+// * This program is free software: you can redistribute it and/or modify
+// * it under the terms of the GNU General Public License as published by
+// * the Free Software Foundation, either version 3 of the License, or
+// * (at your option) any later version.
+// *
+// * This program is distributed in the hope that it will be useful,
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// * GNU General Public License for more details.
+// *
+// * You should have received a copy of the GNU General Public License
+// * along with this program. If not, see  http://www.gnu.org/licenses/.
+
+// color.cpp
+
+#include "color.h"
+
+// TODO
+
+
+// Returns the color corresponding D3DCOLOR.
+
+D3DCOLOR RetColor(float intensity)
+{
+  D3DCOLOR  color;
+  
+  if ( intensity <= 0.0f )  return 0x00000000;
+  if ( intensity >= 1.0f )  return 0xffffffff;
+  
+  color  = (int)(intensity*255.0f)<<24;
+  color |= (int)(intensity*255.0f)<<16;
+  color |= (int)(intensity*255.0f)<<8;
+  color |= (int)(intensity*255.0f);
+  
+  return color;
+}
+
+// Returns the color corresponding D3DCOLOR.
+
+D3DCOLOR RetColor(D3DCOLORVALUE intensity)
+{
+  D3DCOLOR  color;
+  
+  color  = (int)(intensity.a*255.0f)<<24;
+  color |= (int)(intensity.r*255.0f)<<16;
+  color |= (int)(intensity.g*255.0f)<<8;
+  color |= (int)(intensity.b*255.0f);
+  
+  return color;
+}
+
+// Returns the color corresponding D3DCOLORVALUE.
+
+D3DCOLORVALUE RetColor(D3DCOLOR intensity)
+{
+  D3DCOLORVALUE color;
+  
+  color.r = (float)((intensity>>16)&0xff)/256.0f;
+  color.g = (float)((intensity>>8 )&0xff)/256.0f;
+  color.b = (float)((intensity>>0 )&0xff)/256.0f;
+  color.a = (float)((intensity>>24)&0xff)/256.0f;
+  
+  return color;
+}
+
+
+// RGB to HSV conversion.
+
+void RGB2HSV(D3DCOLORVALUE src, ColorHSV &dest)
+{
+  float min, max, delta;
+  
+  min = Min(src.r, src.g, src.b);
+  max = Max(src.r, src.g, src.b);
+  
+  dest.v = max;  // intensity
+  
+  if ( max == 0.0f )
+  {
+    dest.s = 0.0f;  // saturation
+    dest.h = 0.0f;  // undefined color!
+  }
+  else
+  {
+    delta = max-min;
+    dest.s = delta/max;  // saturation
+    
+    if ( src.r == max )  // between yellow & magenta
+    {
+      dest.h = (src.g-src.b)/delta;
+    }
+    else if ( src.g == max )  // between cyan & yellow
+    {
+      dest.h = 2.0f+(src.b-src.r)/delta;
+    }
+    else  // between magenta & cyan
+    {
+      dest.h = 4.0f+(src.r-src.g)/delta;
+    }
+    
+    dest.h *= 60.0f;  // in degrees
+    if ( dest.h < 0.0f )  dest.h += 360.0f;
+    dest.h /= 360.0f;  // 0..1
+  }
+}
+
+// HSV to RGB conversion.
+
+void HSV2RGB(ColorHSV src, D3DCOLORVALUE &dest)
+{
+  int   i;
+  float f,v,p,q,t;
+  
+  src.h = Norm(src.h)*360.0f;
+  src.s = Norm(src.s);
+  src.v = Norm(src.v);
+  
+  if ( src.s == 0.0f )  // zero saturation?
+  {
+    dest.r = src.v;
+    dest.g = src.v;
+    dest.b = src.v;  // gray
+  }
+  else
+  {
+    if ( src.h == 360.0f )  src.h = 0.0f;
+    src.h /= 60.0f;
+    i = (int)src.h;  // integer part (0 .. 5)
+    f = src.h-i;     // fractional part
+    
+    v = src.v;
+    p = src.v*(1.0f-src.s);
+    q = src.v*(1.0f-(src.s*f));
+    t = src.v*(1.0f-(src.s*(1.0f-f)));
+    
+    switch (i)
+    {
+      case 0:  dest.r=v; dest.g=t; dest.b=p;  break;
+      case 1:  dest.r=q; dest.g=v; dest.b=p;  break;
+      case 2:  dest.r=p; dest.g=v; dest.b=t;  break;
+      case 3:  dest.r=p; dest.g=q; dest.b=v;  break;
+      case 4:  dest.r=t; dest.g=p; dest.b=v;  break;
+      case 5:  dest.r=v; dest.g=p; dest.b=q;  break;
+    }
+  }
+}
+
diff --git a/src/graphics/common/color.h b/src/graphics/common/color.h
new file mode 100644
index 0000000..9d6114a
--- /dev/null
+++ b/src/graphics/common/color.h
@@ -0,0 +1,31 @@
+// * This file is part of the COLOBOT source code
+// * Copyright (C) 2012, Polish Portal of Colobot (PPC)
+// *
+// * This program is free software: you can redistribute it and/or modify
+// * it under the terms of the GNU General Public License as published by
+// * the Free Software Foundation, either version 3 of the License, or
+// * (at your option) any later version.
+// *
+// * This program is distributed in the hope that it will be useful,
+// * but WITHOUT ANY WARRANTY; without even the implied warranty of
+// * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// * GNU General Public License for more details.
+// *
+// * You should have received a copy of the GNU General Public License
+// * along with this program. If not, see  http://www.gnu.org/licenses/.
+
+// color.h
+
+// TODO
+struct Color
+{
+};
+
+#pragma once
+
+D3DCOLOR    RetColor(float intensity);
+D3DCOLOR    RetColor(D3DCOLORVALUE intensity);
+D3DCOLORVALUE RetColor(D3DCOLOR intensity);
+
+void      RGB2HSV(D3DCOLORVALUE src, ColorHSV &dest);
+void      HSV2RGB(ColorHSV src, D3DCOLORVALUE &dest);