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204 lines
6.4 KiB
C++
204 lines
6.4 KiB
C++
// This code is in the public domain -- castanyo@yahoo.es
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#pragma once
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#ifndef NV_MATH_COLOR_INL
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#define NV_MATH_COLOR_INL
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#include "Color.h"
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#include "Vector.inl"
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#include "ftoi.h"
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namespace nv
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{
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// for Color16 & Color16_4444 bitfields
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NV_FORCEINLINE uint32 U32round(float f) { return uint32(floorf(f + 0.5f)); }
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NV_FORCEINLINE uint16 U16round(float f) { return uint16(floorf(f + 0.5f)); }
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NV_FORCEINLINE uint16 toU4_in_U16(int x) { nvDebugCheck(x >= 0 && x <= 15u); return (uint16)x; }
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NV_FORCEINLINE uint16 toU5_in_U16(int x) { nvDebugCheck(x >= 0 && x <= 31u); return (uint16)x; }
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NV_FORCEINLINE uint16 toU6_in_U16(int x) { nvDebugCheck(x >= 0 && x <= 63u); return (uint16)x; }
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// Clamp color components.
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inline Vector3 colorClamp(Vector3::Arg c)
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{
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return Vector3(saturate(c.x), saturate(c.y), saturate(c.z));
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}
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// Clamp without allowing the hue to change.
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inline Vector3 colorNormalize(Vector3::Arg c)
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{
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float scale = 1.0f;
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if (c.x > scale) scale = c.x;
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if (c.y > scale) scale = c.y;
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if (c.z > scale) scale = c.z;
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return c / scale;
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}
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// Convert Color16 from float components
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inline Color16 toColor16(float r, float g, float b)
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{
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Color16 color; // 5,6,5
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color.r = toU5_in_U16(nv::U16round(saturate(r) * 31u));
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color.g = toU6_in_U16(nv::U16round(saturate(g) * 63u));
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color.b = toU5_in_U16(nv::U16round(saturate(b) * 31u));
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return color;
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}
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// Convert Color32 to Color16.
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inline Color16 toColor16(Color32 c)
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{
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Color16 color;
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// rrrrrggggggbbbbb
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// rrrrr000gggggg00bbbbb000
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// color.u = (c.u >> 3) & 0x1F;
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// color.u |= (c.u >> 5) & 0x7E0;
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// color.u |= (c.u >> 8) & 0xF800;
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color.r = c.r >> 3;
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color.g = c.g >> 2;
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color.b = c.b >> 3;
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return color;
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}
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// Convert Color32 to Color16_4444.
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inline Color16_4444 toColor16_4444(Color32 c)
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{
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Color16_4444 color;
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color.a = c.a >> 4;
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color.r = c.r >> 4;
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color.g = c.g >> 4;
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color.b = c.b >> 4;
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return color;
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}
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// Convert float[4] to Color16_4444.
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inline Color16_4444 toColor16_4444(float r, float g, float b, float a)
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{
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Color16_4444 color;
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color.a = toU4_in_U16(nv::U16round(saturate(a) * 15u));
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color.r = toU4_in_U16(nv::U16round(saturate(r) * 15u));
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color.g = toU4_in_U16(nv::U16round(saturate(g) * 15u));
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color.b = toU4_in_U16(nv::U16round(saturate(b) * 15u));
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return color;
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}
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// Convert float[4] to Color16_4444.
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inline Color16_4444 toColor16_4444_from_argb(float * fc)
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{
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Color16_4444 color;
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color.a = toU4_in_U16(nv::U16round(saturate(fc[0]) * 15u));
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color.r = toU4_in_U16(nv::U16round(saturate(fc[1]) * 15u));
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color.g = toU4_in_U16(nv::U16round(saturate(fc[2]) * 15u));
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color.b = toU4_in_U16(nv::U16round(saturate(fc[3]) * 15u));
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return color;
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}
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// Convert float[4] to Color16_4444.
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inline Color16_4444 toColor16_4444_from_bgra(float * fc)
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{
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Color16_4444 color;
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color.b = toU4_in_U16(nv::U16round(saturate(fc[0]) * 15u));
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color.g = toU4_in_U16(nv::U16round(saturate(fc[1]) * 15u));
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color.r = toU4_in_U16(nv::U16round(saturate(fc[2]) * 15u));
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color.a = toU4_in_U16(nv::U16round(saturate(fc[3]) * 15u));
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return color;
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}
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// Promote 16 bit color to 32 bit using regular bit expansion.
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inline Color32 toColor32(Color16 c)
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{
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Color32 color;
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// c.u = ((col0.u << 3) & 0xf8) | ((col0.u << 5) & 0xfc00) | ((col0.u << 8) & 0xf80000);
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// c.u |= (c.u >> 5) & 0x070007;
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// c.u |= (c.u >> 6) & 0x000300;
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color.b = (c.b << 3) | (c.b >> 2);
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color.g = (c.g << 2) | (c.g >> 4);
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color.r = (c.r << 3) | (c.r >> 2);
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color.a = 0xFF;
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return color;
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}
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// @@ Quantize with exact endpoints or with uniform bins?
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inline Color32 toColor32(const Vector4 & v)
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{
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Color32 color;
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color.r = U8(ftoi_round(saturate(v.x) * 255));
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color.g = U8(ftoi_round(saturate(v.y) * 255));
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color.b = U8(ftoi_round(saturate(v.z) * 255));
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color.a = U8(ftoi_round(saturate(v.w) * 255));
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return color;
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}
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inline Color32 toColor32_from_bgra(const Vector4 & v)
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{
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Color32 color;
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color.b = U8(ftoi_round(saturate(v.x) * 255));
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color.g = U8(ftoi_round(saturate(v.y) * 255));
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color.r = U8(ftoi_round(saturate(v.z) * 255));
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color.a = U8(ftoi_round(saturate(v.w) * 255));
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return color;
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}
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inline Color32 toColor32_from_argb(const Vector4 & v)
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{
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Color32 color;
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color.a = U8(ftoi_round(saturate(v.x) * 255));
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color.r = U8(ftoi_round(saturate(v.y) * 255));
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color.g = U8(ftoi_round(saturate(v.z) * 255));
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color.b = U8(ftoi_round(saturate(v.w) * 255));
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return color;
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}
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inline Vector4 toVector4(Color32 c)
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{
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const float scale = 1.0f / 255.0f;
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return Vector4(c.r * scale, c.g * scale, c.b * scale, c.a * scale);
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}
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inline float perceptualColorDistance(Vector3::Arg c0, Vector3::Arg c1)
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{
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float rmean = (c0.x + c1.x) * 0.5f;
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float r = c1.x - c0.x;
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float g = c1.y - c0.y;
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float b = c1.z - c0.z;
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return sqrtf((2 + rmean)*r*r + 4*g*g + (3 - rmean)*b*b);
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}
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inline float hue(float r, float g, float b) {
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float h = atan2f(sqrtf(3.0f)*(g-b), 2*r-g-b) * (1.0f / (2 * PI)) + 0.5f;
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return h;
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}
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inline float toSrgb(float f) {
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if (nv::isNan(f)) f = 0.0f;
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else if (f <= 0.0f) f = 0.0f;
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else if (f <= 0.0031308f) f = 12.92f * f;
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else if (f <= 1.0f) f = (powf(f, 0.41666f) * 1.055f) - 0.055f;
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else f = 1.0f;
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return f;
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}
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inline float fromSrgb(float f) {
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if (f < 0.0f) f = 0.0f;
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else if (f < 0.04045f) f = f / 12.92f;
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else if (f <= 1.0f) f = powf((f + 0.055f) / 1.055f, 2.4f);
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else f = 1.0f;
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return f;
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}
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inline Vector3 toSrgb(const Vector3 & v) {
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return Vector3(toSrgb(v.x), toSrgb(v.y), toSrgb(v.z));
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}
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inline Vector3 fromSrgb(const Vector3 & v) {
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return Vector3(fromSrgb(v.x), fromSrgb(v.y), fromSrgb(v.z));
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}
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} // nv namespace
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#endif // NV_MATH_COLOR_INL
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