1 files changed, 69 insertions, 0 deletions
diff --git a/hw6/src/bilinearTexture.cpp b/hw6/src/bilinearTexture.cpp
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+++ b/hw6/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
+{
+  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() << ")";
+}