added 3dengfx into the repo, probably not the correct version for this

[summerhack] / src / 3dengfx / src / gfx / color.cpp

diff --git a/src/3dengfx/src/gfx/color.cpp b/src/3dengfx/src/gfx/color.cpp
new file mode 100644 (file)
index 0000000..c7b93be
--- /dev/null
+++ b/src/3dengfx/src/gfx/color.cpp
@@ -0,0 +1,115 @@
+/*
+Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
+
+This file is part of the graphics core library.
+
+the graphics core library 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 2 of the License, or
+(at your option) any later version.
+
+the graphics core library 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 the graphics core library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* colors
+ * author: John Tsiombikas 2004
+ */
+
+#include "3dengfx_config.h"
+
+#include <cmath>
+#include "color.hpp"
+
+template <class T>
+const T &clamp(const T &val, const T &low, const T &high) {
+       if(val > high) return high;
+       if(val < low) return low;
+       return val;
+}
+
+Color::Color(scalar_t intensity) {
+       r = g = b = clamp<scalar_t>(intensity, 0.0f, 1.0f);
+       a = 1.0f;
+}
+
+Color::Color(scalar_t r, scalar_t g, scalar_t b, scalar_t a) {
+       this->r = clamp<scalar_t>(r, 0.0f, 1.0f);
+       this->g = clamp<scalar_t>(g, 0.0f, 1.0f);
+       this->b = clamp<scalar_t>(b, 0.0f, 1.0f);
+       this->a = clamp<scalar_t>(a, 0.0f, 1.0f);
+}
+
+unsigned long Color::get_packed32() const {
+       return pack_color32(*this);
+}
+
+unsigned short Color::get_packed16() const {
+       return pack_color16(*this);
+}
+
+unsigned short Color::get_packed15() const {
+       return pack_color15(*this);
+}
+
+unsigned char Color::get_nearest8(const unsigned char **pal) const {
+       return match_nearest8(*this, pal);
+}
+
+Color Color::operator +(const Color &col) const {
+       return Color(r + col.r, g + col.g, b + col.b, a + col.a);
+}
+
+Color Color::operator -(const Color &col) const {
+       return Color(r - col.r, g - col.g, b - col.b, a - col.a);
+}
+
+Color Color::operator *(const Color &col) const {
+       return Color(r * col.r, g * col.g, b * col.b, a * col.a);
+}
+       
+Color Color::operator *(scalar_t scalar) const {
+       return Color(r * scalar, g * scalar, b * scalar, a);
+}
+
+
+void Color::operator +=(const Color &col) {
+       *this = Color(r + col.r, g + col.g, b + col.b, a + col.a);
+}
+
+void Color::operator -=(const Color &col) {
+       *this = Color(r - col.r, g - col.g, b - col.b, a - col.a);
+}
+
+void Color::operator *=(const Color &col) {
+       *this = Color(r * col.r, g * col.g, b * col.b, a * col.a);
+}
+
+void Color::operator *=(scalar_t scalar) {
+       *this = Color(r * scalar, g * scalar, b * scalar, a);
+}
+
+unsigned char match_nearest8(const Color &col, const unsigned char **pal) {
+       static const scalar_t half_pi = 1.5707963268;
+
+       scalar_t score[256];
+       for(int i=0; i<256; i++) {
+               Color palcol = lookup_color8(i, pal);
+               scalar_t near_r = (scalar_t)cos(fabs(col.r - palcol.r) * half_pi);
+               scalar_t near_g = (scalar_t)cos(fabs(col.g - palcol.g) * half_pi);
+               scalar_t near_b = (scalar_t)cos(fabs(col.b - palcol.b) * half_pi);
+               score[i] = near_r + near_g + near_b;
+       }
+
+       int nearest = 0;
+       for(int i=0; i<256; i++) {
+               if(score[i] > score[nearest]) nearest = i;
+       }
+       return nearest;
+}