80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
#include "common/texture.h"
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#include <cmath>
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#include <fstream>
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#include <iostream>
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#include <string>
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Texture::Texture(int width, int height) { this->resize(width, height); }
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Texture::Texture(char const *fileName) { this->load(fileName); }
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bool Texture::load(char const *fileName) {
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CImg<unsigned char> img_char(fileName);
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if (img_char.is_empty()) {
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std::cerr << "(Image): Could not open file " << fileName << std::endl;
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return false;
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}
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this->image_ = CImg<float>(img_char.width(), img_char.height(), img_char.depth(), 3, 0);
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for (int c = 0; c < 3; c++)
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cimg_forXYZ(img_char, x, y, z) {
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this->image_(x, y, z, c) = img_char(x, y, z, std::min(c, img_char.spectrum() - 1)) / 255.0f;
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}
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return true;
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}
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bool Texture::save(char const *fileName) const {
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CImg<unsigned char> img_char;
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img_char = 255 * this->image_;
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img_char.save(fileName);
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return true;
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}
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Color Texture::getPixelAt(int x, int y) const {
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if ((x %= this->width()) < 0)
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x += this->width();
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if ((y %= this->height()) < 0)
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y += this->height();
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return Color(this->image_.atXY(x, y, 0), this->image_.atXY(x, y, 1), this->image_.atXY(x, y, 2));
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}
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void Texture::setPixelAt(int x, int y, Color const &color) {
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if ((x %= this->width()) < 0)
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x += this->width();
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if ((y %= this->height()) < 0)
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y += this->height();
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this->image_(x, y, 0) = color.r;
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this->image_(x, y, 1) = color.g;
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this->image_(x, y, 2) = color.b;
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}
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Color Texture::color(float u, float v, bool interpolate) const {
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Color color;
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if (!interpolate) {
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color = this->getPixelAt(int(roundf(u * this->width())), int(roundf(v * this->height())));
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} else {
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// IMPLEMENT bilinear interpolation
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float x = u * this->width();
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float x1 = std::floor(x);
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float x2 = std::ceil(x);
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float y = v * this->height();
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float y1 = std::floor(y);
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float y2 = std::ceil(y);
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Color x1y1 = this->getPixelAt(static_cast<int>(x1), static_cast<int>(y1));
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Color x2y1 = this->getPixelAt(static_cast<int>(x2), static_cast<int>(y1));
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Color x1y2 = this->getPixelAt(static_cast<int>(x1), static_cast<int>(y2));
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Color x2y2 = this->getPixelAt(static_cast<int>(x2), static_cast<int>(y2));
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Color fxy1 = (x2 - x) * x1y1 + (x - x1) * x2y1;
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Color fxy2 = (x2 - x) * x1y2 + (x - x1) * x2y2;
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color = (y2 - y) * fxy1 + (y - y1) * fxy2;
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}
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return color;
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}
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Color Texture::color(Vector2d const &surfacePosition, bool interpolate) const {
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return color(surfacePosition.u, surfacePosition.v, interpolate);
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}
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