1 files changed, 69 insertions, 0 deletions
diff --git a/hw5/src/bilinearTexture.cpp b/hw5/src/bilinearTexture.cpp
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+++ b/hw5/src/bilinearTexture.cpp
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+/******************************************************************/
+/* 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
+{
+  // HW5: Implement a bilinear texture evaluation. Given a texture coordinate
+  //      return the bilinearly interpolate the color.
+  // Modifes: nothing.
+  // Returns: color.
+  
+  vec2d::value_type x, y, x1, x2, y1, y2, dx, dy;
+  color a, b;
+
+  x = textureCoord.u * (image::width() - 1);
+  y = textureCoord.v * (image::height() - 1);
+  x1 = floor(x);
+  x2 = x1 + 1;
+  y1 = floor(y);
+  y2 = y1 + 1;
+  dx = x - x1;
+  dy = y - y1;
+  a = _at(x1, y1) * (1 - dx) + _at(x2, y1) * dx;
+  b = _at(x1, y2) * (1 - dx) + _at(x2, y2) * dx;
+  return  a * (1 - dy) + b * (dy);
+}
+
+
+/////////////////////
+// Private Methods //
+/////////////////////
+void bilinearTexture::_print(std::ostream& s) const
+{
+  s << "Bilinear texture (" << this->width() << "x" << this->height() << ")";
+}