New structure

[dragonblocks3d.git] / src / texture.cpp

diff --git a/src/texture.cpp b/src/texture.cpp
new file mode 100644 (file)
index 0000000..a595411
--- /dev/null
+++ b/src/texture.cpp
@@ -0,0 +1,51 @@
+#include <iostream>
+#include <stdexcept>
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+#include "texture.hpp"
+
+using namespace std;
+using namespace dragonblocks;
+
+bool Texture::mipmap;
+bool Texture::bilinear_filter;
+GLenum Texture::min_filter, Texture::mag_filter;
+
+void Texture::initArgs()
+{
+       min_filter = mag_filter = bilinear_filter ? GL_LINEAR : GL_NEAREST;
+       if (mipmap) {
+               if (min_filter == GL_NEAREST) {
+                       min_filter = GL_NEAREST_MIPMAP_NEAREST;
+               } else {
+                       min_filter = GL_LINEAR_MIPMAP_NEAREST;
+               }
+       }
+       stbi_set_flip_vertically_on_load(true);
+}
+
+void Texture::bind() const
+{
+       glBindTexture(GL_TEXTURE_2D, id); CHECKERR
+}
+
+void Texture::load(const string &path)
+{
+       int width, height, nrChannels;
+       unsigned char *data = stbi_load(path.c_str(), &width, &height, &nrChannels, 0);
+       if (! data)
+               throw runtime_error("Failed to load texture " + path);
+       glGenTextures(1, &id); CHECKERR
+       bind();
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, Texture::min_filter); CHECKERR
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, Texture::mag_filter); CHECKERR
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); CHECKERR
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); CHECKERR
+       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); CHECKERR
+       if (Texture::mipmap)
+               glGenerateMipmap(GL_TEXTURE_2D); CHECKERR
+       stbi_image_free(data);
+       glBindTexture(GL_TEXTURE_2D, 0); CHECKERR
+       cout << "Loaded texture " << path << endl;
+}
+