GEEKING

Rendering/g3d/g3dcpp/Color4.cpp

@@ -0,0 +1,130 @@
+/**
+ @file Color4.cpp
+
+ Color class.
+
+ @author Morgan McGuire, http://graphics.cs.williams.edu
+ @cite Portions by Laura Wollstadt, graphics3d.com
+ @cite Portions based on Dave Eberly's Magic Software Library at http://www.magic-software.com
+
+
+ @created 2002-06-25
+ @edited  2009-11-10
+ */
+
+#include <stdlib.h>
+#include "G3D/Color4.h"
+#include "G3D/Color4uint8.h"
+#include "G3D/Vector4.h"
+#include "G3D/format.h"
+#include "G3D/stringutils.h"
+
+namespace G3D {
+
+const Color4& Color4::one() {
+    const static Color4 x(1.0f, 1.0f, 1.0f, 1.0f);
+    return x;
+}
+
+
+const Color4& Color4::zero() {
+    static Color4 c(0.0f, 0.0f, 0.0f, 0.0f);
+    return c;
+}
+
+
+const Color4& Color4::inf() {
+    static Color4 c((float)G3D::finf(), (float)G3D::finf(), (float)G3D::finf(), (float)G3D::finf());
+    return c;
+}
+
+
+const Color4& Color4::nan() {
+    static Color4 c((float)G3D::fnan(), (float)G3D::fnan(), (float)G3D::fnan(), (float)G3D::fnan());
+    return c;
+}
+
+
+const Color4& Color4::clear() {
+    return Color4::zero();
+}
+
+
+Color4::Color4(const Vector4& v) {
+    r = v.x;
+    g = v.y;
+    b = v.z;
+    a = v.w;
+}
+
+
+Color4::Color4(const Color4uint8& c) : r(c.r), g(c.g), b(c.b), a(c.a) {
+    *this /= 255.0f;
+}
+
+size_t Color4::hashCode() const {
+    unsigned int rhash = (*(int*)(void*)(&r));
+    unsigned int ghash = (*(int*)(void*)(&g));
+    unsigned int bhash = (*(int*)(void*)(&b));
+    unsigned int ahash = (*(int*)(void*)(&a));
+
+    return rhash + (ghash * 37) + (bhash * 101) + (ahash * 241);
+}
+
+Color4 Color4::fromARGB(uint32 x) {
+    return Color4(
+        (float)((x >> 16) & 0xFF), 
+        (float)((x >> 8) & 0xFF),
+        (float)(x & 0xFF), 
+        (float)((x >> 24) & 0xFF)) / 255.0;
+}
+
+
+//----------------------------------------------------------------------------
+
+Color4 Color4::operator/ (float fScalar) const {
+    Color4 kQuot;
+
+    if (fScalar != 0.0f) {
+		float fInvScalar = 1.0f / fScalar;
+        kQuot.r = fInvScalar * r;
+        kQuot.g = fInvScalar * g;
+        kQuot.b = fInvScalar * b;
+        kQuot.a = fInvScalar * a;
+        return kQuot;
+
+    } else {
+
+        return Color4::inf();
+    }
+}
+
+//----------------------------------------------------------------------------
+
+Color4& Color4::operator/= (float fScalar) {
+    if (fScalar != 0.0f) {
+		float fInvScalar = 1.0f / fScalar;
+        r *= fInvScalar;
+        g *= fInvScalar;
+        b *= fInvScalar;
+        a *= fInvScalar;
+    } else {
+        r = (float)G3D::finf();
+        g = (float)G3D::finf();
+        b = (float)G3D::finf();
+        a = (float)G3D::finf();
+    }
+
+    return *this;
+}
+
+//----------------------------------------------------------------------------
+
+std::string Color4::toString() const {
+    return G3D::format("(%g, %g, %g, %g)", r, g, b, a);
+}
+
+//----------------------------------------------------------------------------
+
+}; // namespace
+