mirror of https://github.com/skeeto/pixelcity.git
401 lines
9.2 KiB
C++
401 lines
9.2 KiB
C++
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/*-----------------------------------------------------------------------------
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glRgba.cpp
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2009 Shamus Young
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-------------------------------------------------------------------------------
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Functions for dealing with RGBA color values.
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-----------------------------------------------------------------------------*/
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#include <windows.h>
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#include <stdio.h>
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#include <gl\gl.h>
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#include <math.h>
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#include "math.h"
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#include "glTypes.h"
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#include "macro.h"
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaFromHsl (float h, float sl, float l)
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{
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float v;
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float r,g,b;
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r = l; // default to gray
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g = l;
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b = l;
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v = (l <= 0.5f) ? (l * (1.0f + sl)) : (l + sl - l * sl);
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if (v > 0) {
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float m;
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float sv;
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int sextant;
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float fract, vsf, mid1, mid2;
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m = l + l - v;
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sv = (v - m ) / v;
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h *= 6.0f;
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sextant = (int)h;
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fract = h - sextant;
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vsf = v * sv * fract;
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mid1 = m + vsf;
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mid2 = v - vsf;
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switch (sextant) {
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case 0:
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r = v; g = mid1; b = m;
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break;
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case 1:
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r = mid2; g = v; b = m;
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break;
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case 2:
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r = m; g = v; b = mid1;
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break;
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case 3:
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r = m; g = mid2; b = v;
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break;
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case 4:
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r = mid1; g = m; b = v;
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break;
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case 5:
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r = v; g = m; b = mid2;
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break;
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}
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}
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return glRgba (r, g, b);
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaInterpolate (GLrgba c1, GLrgba c2, float delta)
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{
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GLrgba result;
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result.red = MathInterpolate (c1.red, c2.red, delta);
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result.green = MathInterpolate (c1.green, c2.green, delta);
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result.blue = MathInterpolate (c1.blue, c2.blue, delta);
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result.alpha = MathInterpolate (c1.alpha, c2.alpha, delta);
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaAdd (GLrgba c1, GLrgba c2)
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{
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GLrgba result;
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result.red = c1.red + c2.red;
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result.green = c1.green + c2.green;
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result.blue = c1.blue + c2.blue;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaSubtract (GLrgba c1, GLrgba c2)
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{
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GLrgba result;
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result.red = c1.red - c2.red;
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result.green = c1.green - c2.green;
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result.blue = c1.blue - c2.blue;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaMultiply (GLrgba c1, GLrgba c2)
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{
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GLrgba result;
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result.red = c1.red * c2.red;
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result.green = c1.green * c2.green;
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result.blue = c1.blue * c2.blue;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaScale (GLrgba c, float scale)
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{
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c.red *= scale;
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c.green *= scale;
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c.blue *= scale;
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return c;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgba (char* string)
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{
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long color;
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char buffer[10];
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char* pound;
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GLrgba result;
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strncmp (buffer, string, 10);
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if (pound = strchr (buffer, '#'))
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pound[0] = ' ';
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if (sscanf (string, "%x", &color) != 1)
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return glRgba (0.0f);
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result.red = (float)GetBValue (color) / 255.0f;
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result.green = (float)GetGValue (color) / 255.0f;
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result.blue = (float)GetRValue (color) / 255.0f;
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result.alpha = 1.0f;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgba (int red, int green, int blue)
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{
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GLrgba result;
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result.red = (float)red / 255.0f;
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result.green = (float)green / 255.0f;
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result.blue = (float)blue / 255.0f;
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result.alpha = 1.0f;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgba (float red, float green, float blue)
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{
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GLrgba result;
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result.red = red;
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result.green = green;
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result.blue = blue;
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result.alpha = 1.0f;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgba (float red, float green, float blue, float alpha)
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{
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GLrgba result;
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result.red = red;
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result.green = green;
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result.blue = blue;
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result.alpha = alpha;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgba (long c)
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{
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GLrgba result;
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result.red = (float)GetRValue (c) / 255.0f;
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result.green = (float)GetGValue (c) / 255.0f;
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result.blue = (float)GetBValue (c) / 255.0f;
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result.alpha = 1.0f;
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return result;
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}
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/*-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------*/
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GLrgba glRgba (float luminance)
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{
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GLrgba result;
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result.red = luminance;
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result.green = luminance;
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result.blue = luminance;
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result.alpha = 1.0f;
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return result;
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}
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/*-----------------------------------------------------------------------------
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Takes the given index and returns a "random" color unique for that index.
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512 Unique values: #0 and #512 will be the same, as will #1 and #513, etc
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Useful for visual debugging in some situations.
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-----------------------------------------------------------------------------*/
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GLrgba glRgbaUnique (int i)
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{
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GLrgba c;
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c.alpha = 1.0f;
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c.red = 0.4f + ((i & 1) ? 0.2f : 0.0f) + ((i & 8) ? 0.3f : 0.0f) - ((i & 64) ? 0.3f : 0.0f);
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c.green = 0.4f + ((i & 2) ? 0.2f : 0.0f) + ((i & 32) ? 0.3f : 0.0f) - ((i & 128) ? 0.3f : 0.0f);
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c.blue = 0.4f + ((i & 4) ? 0.2f : 0.0f) + ((i & 16) ? 0.3f : 0.0f) - ((i & 256) ? 0.3f : 0.0f);
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return c;
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}
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/*-----------------------------------------------------------------------------
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+ operator
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-----------------------------------------------------------------------------*/
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GLrgba GLrgba::operator+ (const GLrgba& c)
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{
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return glRgba (red + c.red, green + c.green, blue + c.blue, alpha);
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}
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GLrgba GLrgba::operator+ (const float& c)
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{
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return glRgba (red + c, green + c, blue + c, alpha);
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}
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void GLrgba::operator+= (const GLrgba& c)
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{
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red += c.red;
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green += c.green;
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blue += c.blue;
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}
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void GLrgba::operator+= (const float& c)
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{
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red += c;
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green += c;
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blue += c;
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}
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/*-----------------------------------------------------------------------------
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- operator
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-----------------------------------------------------------------------------*/
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GLrgba GLrgba::operator- (const GLrgba& c)
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{
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return glRgba (red - c.red, green - c.green, blue - c.blue);
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}
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GLrgba GLrgba::operator- (const float& c)
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{
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return glRgba (red - c, green - c, blue - c, alpha);
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}
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void GLrgba::operator-= (const GLrgba& c)
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{
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red -= c.red;
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green -= c.green;
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blue -= c.blue;
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}
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void GLrgba::operator-= (const float& c)
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{
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red -= c;
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green -= c;
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blue -= c;
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}
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/*-----------------------------------------------------------------------------
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* operator
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-----------------------------------------------------------------------------*/
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GLrgba GLrgba::operator* (const GLrgba& c)
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{
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return glRgba (red * c.red, green * c.green, blue * c.blue);
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}
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GLrgba GLrgba::operator* (const float& c)
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{
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return glRgba (red * c, green * c, blue * c, alpha);
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}
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void GLrgba::operator*= (const GLrgba& c)
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{
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red *= c.red;
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green *= c.green;
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blue *= c.blue;
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}
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void GLrgba::operator*= (const float& c)
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{
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red *= c;
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green *= c;
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blue *= c;
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}
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/*-----------------------------------------------------------------------------
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/ operator
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-----------------------------------------------------------------------------*/
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GLrgba GLrgba::operator/ (const GLrgba& c)
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{
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return glRgba (red / c.red, green / c.green, blue / c.blue);
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}
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GLrgba GLrgba::operator/ (const float& c)
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{
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return glRgba (red / c, green / c, blue / c, alpha);
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}
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void GLrgba::operator/= (const GLrgba& c)
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{
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red /= c.red;
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green /= c.green;
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blue /= c.blue;
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}
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void GLrgba::operator/= (const float& c)
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{
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red /= c;
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green /= c;
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blue /= c;
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}
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bool GLrgba::operator== (const GLrgba& c)
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{
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return (red == c.red && green == c.green && blue == c.blue);
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}
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