1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
#ifndef GRADIENT_H
#define GRADIENT_H
#include "Color.h"
#include "Runtime/Utilities/LogAssert.h"
enum
{
kGradientMaxNumKeys = 8,
kOptimizedGradientMaxNumKeys = kGradientMaxNumKeys + kGradientMaxNumKeys, // color keys + alpha keys
};
// Optimized version of gradient
struct OptimizedGradient
{
static inline UInt32 InverseLerpWordOptimized (UInt32 from, UInt32 rcp, UInt32 v)
{
DebugAssert((from & 0xffff) == from);
DebugAssert((v & 0xffff) == v);
return ((v - from) * rcp)>>16;
}
inline ColorRGBA32 Evaluate(float normalizedTime) const
{
DebugAssert((normalizedTime >= 0.0f) && (normalizedTime <= 1.0f));
DebugAssert(keyCount >= 2);
UInt32 time = NormalizedToWord(normalizedTime);
// Color blend
const UInt32 numKeys = keyCount;
time = std::min(std::max((UInt32)times[0], time), (UInt32)times[keyCount-1]); // TODO: Is this necessary?
for (int i = 1; i < numKeys; i++)
{
const UInt32 currTime = times[i];
if(time <= currTime)
{
const UInt32 prevTime = times[i-1];
const UInt32 frac = InverseLerpWordOptimized(prevTime, rcp[i], time);
return Lerp (colors[i-1], colors[i], frac);
}
}
return ColorRGBA32 (0xff,0xff,0xff,0xff);
}
ColorRGBA32 colors[kOptimizedGradientMaxNumKeys];
UInt32 times[kOptimizedGradientMaxNumKeys];
UInt32 rcp[kOptimizedGradientMaxNumKeys]; // precomputed reciprocals
UInt32 keyCount;
};
// Work in progress (Rename NEW to something else when found..)
class GradientNEW
{
public:
GradientNEW ();
~GradientNEW ();
DECLARE_SERIALIZE_NO_PPTR (GradientNEW)
ColorRGBA32 Evaluate(float time) const;
struct ColorKey
{
DEFINE_GET_TYPESTRING (GradientColorKey)
ColorKey () {}
ColorKey (ColorRGBAf color, float time) {m_Color = color; m_Time = time;}
ColorRGBAf m_Color;
float m_Time;
};
struct AlphaKey
{
DEFINE_GET_TYPESTRING (GradientAlphaKey)
AlphaKey () {}
AlphaKey (float alpha, float time) {m_Alpha = alpha; m_Time = time;}
float m_Alpha;
float m_Time;
};
void SetKeys (ColorKey* colorKeys, unsigned numColorKeys, AlphaKey* alphaKeys, unsigned numAlphaKeys);
void SetColorKeys (ColorKey* colorKeys, unsigned numKeys);
void SetAlphaKeys (AlphaKey* alphaKeys, unsigned numKeys);
void SetNumColorKeys (int numColorKeys) { m_NumColorKeys = numColorKeys;};
void SetNumAlphaKeys (int numAlphaKeys) { m_NumAlphaKeys = numAlphaKeys; };
int GetNumColorKeys () const { return m_NumColorKeys; }
int GetNumAlphaKeys () const { return m_NumAlphaKeys; }
ColorRGBA32& GetKey (unsigned index) { return m_Keys[index]; }
const ColorRGBA32& GetKey (unsigned index) const { return m_Keys[index]; }
UInt16& GetColorTime (unsigned index) { return m_ColorTime[index]; }
const UInt16& GetColorTime (unsigned index) const { return m_ColorTime[index]; }
UInt16& GetAlphaTime(unsigned index) { return m_AlphaTime[index]; }
const UInt16& GetAlphaTime(unsigned index) const { return m_AlphaTime[index]; }
ColorRGBA32 GetConstantColor () const;
void SetConstantColor (ColorRGBA32 color);
void SwapColorKeys (int i, int j);
void SwapAlphaKeys (int i, int j);
void InitializeOptimized(OptimizedGradient& g);
private:
static inline UInt32 InverseLerpWord (UInt32 from, UInt32 to, UInt32 v)
{
DebugAssert((from & 0xffff) == from);
DebugAssert((to & 0xffff) == to);
DebugAssert((v & 0xffff) == v);
DebugAssert (from <= to);
UInt32 nom = (v - from) << 16;
UInt32 den = std::max<UInt32>(to - from, 1);
UInt32 res = nom / den;
return res;
}
static inline UInt32 LerpByte(UInt32 u0, UInt32 u1, UInt32 scale)
{
DebugAssert((u0 & 0xff) == u0);
DebugAssert((u1 & 0xff) == u1);
//DebugAssert((scale & 0xff) == scale);
return u0 + (((u1 - u0) * scale) >> 8) & 0xff;
}
void ValidateColorKeys();
void ValidateAlphaKeys();
ColorRGBA32 m_Keys[kGradientMaxNumKeys];
UInt16 m_ColorTime[kGradientMaxNumKeys];
UInt16 m_AlphaTime[kGradientMaxNumKeys];
UInt8 m_NumColorKeys;
UInt8 m_NumAlphaKeys;
};
inline ColorRGBA32 GradientNEW::Evaluate(float normalizedTime) const
{
DebugAssert((normalizedTime >= 0.0f) && (normalizedTime <= 1.0f));
DebugAssert(m_NumColorKeys >= 2);
DebugAssert(m_NumAlphaKeys >= 2);
ColorRGBA32 color = ColorRGBA32 (0xff,0xff,0xff,0xff);
const UInt32 time = NormalizedToWord(normalizedTime);
// Color blend
const UInt32 numColorKeys = m_NumColorKeys;
const UInt32 timeColor = std::min(std::max((UInt32)m_ColorTime[0], time), (UInt32)m_ColorTime[numColorKeys-1]);
for (int i = 1; i < numColorKeys; i++)
{
const UInt32 currTime = m_ColorTime[i];
if(timeColor <= currTime)
{
const UInt32 prevTime = m_ColorTime[i-1];
const UInt32 frac = InverseLerpWord(prevTime, currTime, timeColor) >> 8; // frac is byte
color = Lerp (m_Keys[i-1], m_Keys[i], frac);
break;
}
}
// Alpha blend
const UInt32 numAlphaKeys = m_NumAlphaKeys;
const UInt32 timeAlpha = std::min(std::max((UInt32)m_AlphaTime[0], time), (UInt32)m_AlphaTime[numAlphaKeys-1]);
for (int i = 1; i < numAlphaKeys; i++)
{
const UInt32 currTime = m_AlphaTime[i];
if(timeAlpha <= currTime)
{
const UInt32 prevTime = m_AlphaTime[i-1];
const UInt32 frac = InverseLerpWord(prevTime, currTime, timeAlpha) >> 8; // frac is byte
color.a = LerpByte(m_Keys[i-1].a, m_Keys[i].a, frac);
break;
}
}
return color;
}
/// Simple class to interpolate between colors.
template<int size>
class GradientDeprecated
{
public:
DEFINE_GET_TYPESTRING (Gradient)
template<class TransferFunc>
void Transfer (TransferFunc& transfer) {
AssertIf (size > 9);
char name[] = "m_Color[ ]";
for (int i=0;i<size;i++)
{
name[8] = '0' + i;
transfer.Transfer (m_Colors[i], name);
}
}
/// Get a color
ColorRGBA32 &operator[] (int i) { AssertIf (i < 0 || i >= size); return m_Colors[i]; }
/// Get a color
const ColorRGBA32 &operator[] (int i) const { AssertIf (i < 0 || i >= size); return m_Colors[i]; }
/// Get the color value at a given position
/// @param position a position in unnormalized 16.16 bit fixed
ColorRGBA32 GetFixed (UInt32 position) const {
AssertIf ((position >> 16) >= size - 1);
return Lerp (m_Colors[position >> 16], m_Colors[(position >> 16) + 1], (position >> 8) & 255);
}
private:
/// The array of colors this interpolator works through
ColorRGBA32 m_Colors[size];
};
#endif
|
