1 files changed, 124 insertions, 0 deletions

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+#include "texture.h"
+#include <stdexcept>
+#include "renderer.h"
+#include "util.h"
+
+// include stb_image
+#define STBI_ONLY_PNG
+#define STBI_ONLY_BMP
+#include "stb_image.h"
+
+Texture::Texture(
+  int width,
+  int height) :
+    width_(width),
+    height_(height)
+{
+  if (!Renderer::isSingletonInitialized())
+  {
+    throw std::logic_error("Renderer needs to be initialized");
+  }
+
+  glBindTexture(GL_TEXTURE_2D, texture_.getId());
+  glTexImage2D(
+    GL_TEXTURE_2D,
+    0,
+    GL_RGBA,
+    width_,
+    height_,
+    0,
+    GL_RGBA,
+    GL_UNSIGNED_BYTE,
+    0);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+}
+
+Texture::Texture(const char* filename)
+{
+  if (!Renderer::isSingletonInitialized())
+  {
+    throw std::logic_error("Renderer needs to be initialized");
+  }
+
+  glBindTexture(GL_TEXTURE_2D, texture_.getId());
+  unsigned char* data = stbi_load(filename, &width_, &height_, 0, 4);
+  flipImageData(data, width_, height_, 4);
+  glTexImage2D(
+    GL_TEXTURE_2D,
+    0,
+    GL_RGBA,
+    width_,
+    height_,
+    0,
+    GL_RGBA,
+    GL_UNSIGNED_BYTE,
+    data);
+
+  stbi_image_free(data);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+}
+
+Texture::Texture(
+  const Texture& tex) :
+    width_(tex.width_),
+    height_(tex.height_)
+{
+  if (!Renderer::isSingletonInitialized())
+  {
+    throw std::logic_error("Renderer needs to be initialized");
+  }
+
+  unsigned char* data = new unsigned char[4 * width_ * height_];
+  glBindTexture(GL_TEXTURE_2D, tex.getId());
+  glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+
+  glBindTexture(GL_TEXTURE_2D, texture_.getId());
+  glTexImage2D(
+    GL_TEXTURE_2D,
+    0,
+    GL_RGBA,
+    width_,
+    height_,
+    0,
+    GL_RGBA,
+    GL_UNSIGNED_BYTE,
+    data);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+
+  delete[] data;
+}
+
+Texture::Texture(Texture&& tex) : Texture(0, 0)
+{
+  swap(*this, tex);
+}
+
+Texture& Texture::operator= (Texture tex)
+{
+  swap(*this, tex);
+
+  return *this;
+}
+
+void swap(Texture& tex1, Texture& tex2)
+{
+  std::swap(tex1.width_, tex2.width_);
+  std::swap(tex1.height_, tex2.height_);
+  std::swap(tex1.texture_, tex2.texture_);
+}
+
+Rectangle Texture::entirety() const
+{
+  return {0, 0, width_, height_};
+}