blob: f9697bf4907c5c71341e30f1132211fcb0742651 (
plain) (
blame)
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
|
/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527 */
/* without consent of either the College of William & Mary or */
/* Pieter Peers. */
/******************************************************************/
#include "bilinearTexture.h"
//////////////////
// Constructors //
//////////////////
bilinearTexture::bilinearTexture(bool repeat)
: texture_base(repeat)
{
// Do nothing.
}
bilinearTexture::bilinearTexture(const bilinearTexture& src)
: texture_base(src)
{
// Do nothing
}
///////////////
// Operators //
///////////////
bilinearTexture& bilinearTexture::operator=(const bilinearTexture& src)
{
_assign(src);
return *this;
}
image::value_type bilinearTexture::operator()(const vec2d& textureCoord) const
{
float scaled_u = textureCoord.u*(width()-1);
float scaled_v = textureCoord.v*(height()-1);
// compute corners
signed int left = floor(scaled_u);
signed int right = ceil(scaled_u);
signed int top = floor(scaled_v);
signed int bottom = ceil(scaled_v);
// compute weights
float hw = fabs(right - scaled_u);
float vw = fabs(bottom - scaled_v);
// compute horizontal interpolated colors
color topColor = hw * _at(left, top) + (1.0f - hw) * _at(right, top);
color bottomColor = hw * _at(left, bottom) + (1.0f - hw) * _at(right, bottom);
// interpolate vertically
return vw * topColor + (1.0f - vw) * bottomColor;
}
/////////////////////
// Private Methods //
/////////////////////
void bilinearTexture::_print(std::ostream& s) const
{
s << "Bilinear texture (" << this->width() << "x" << this->height() << ")";
}
|
