263 lines
7.9 KiB
C++
263 lines
7.9 KiB
C++
/* ✨ +------------------------------------------------------+
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____/ \____ ✨/| Open source game framework licensed to freely use, |
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✨\ / / | copy, and modify. Created for 🌠dank.game🌠 |
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+--\ . . /--+ | |
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| ~/ ︶ \👍| | 🌐 https://open.shampoo.ooo/shampoo/spacebox |
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| ~~~🌊~~~~🌊~ | +------------------------------------------------------+
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| SPACE 🪐🅱 OX | /
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| 🌊 ~ ~~~~ ~~ |/
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+-------------*/
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#include "Texture.hpp"
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using namespace sb;
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Texture::Texture() : GLObject(texture_deleter) {}
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Texture::Texture(fs::path path) : Texture()
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{
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associate(path);
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}
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void Texture::associate(fs::path path)
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{
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this->path = path;
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}
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void Texture::filter(GLint value)
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{
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_filter = value;
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}
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void Texture::generate()
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{
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GLObject::generate(glGenTextures);
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}
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void Texture::generate(glm::vec2 size, GLenum format, std::optional<GLint> filter_value)
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{
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/* Only generate a new texture ID and reallocate memory if the current texture ID hasn't been registered by this object as having
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* identically sized memory with the same format. */
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if (!generated() || !_size.has_value() || !_format.has_value() || _size != size || _format != format)
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{
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generate();
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bind();
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/* Use nullptr because data will be loaded later with glTexSubImage2d */
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glTexImage2D(GL_TEXTURE_2D, 0, format, size.x, size.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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}
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else
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{
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bind();
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}
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/* Set the resizing algorithm of this texture */
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if (!filter_value.has_value())
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{
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filter_value = _filter;
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}
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter_value.value());
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter_value.value());
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/* Set the texture wrap of this texture */
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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sb::Log::gl_errors();
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/* Store a copy of size */
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_size = size;
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}
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void Texture::load()
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{
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if (!path.empty())
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{
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#if !defined(__ANDROID__)
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/* Can't check for file existence in an Android APK */
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if (fs::exists(path))
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{
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#endif
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load(path);
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#if !defined(__ANDROID__)
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}
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else
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{
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std::ostringstream message;
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message << "Error loading texture path: " << path;
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sb::Log::log(message, sb::Log::ERR);
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}
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#endif
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}
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else
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{
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std::ostringstream message;
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message << "Cannot load, no path has been specified yet for texture " << id();
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sb::Log::log(message, sb::Log::WARN);
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}
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}
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void Texture::load(fs::path path)
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{
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std::ostringstream message;
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sb::Log::Level message_level;
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if (path.has_filename())
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{
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/* Load file path as a surface object to access pixel data and flip into OpenGL orientation. Attach a destructor so it will free
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* itself when it goes out of scope at the end of this function. */
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std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> surface(IMG_Load(path.string().c_str()), SDL_FreeSurface);
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if (surface.get() != nullptr)
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{
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std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> flipped_surface(
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rotozoomSurfaceXY(surface.get(), 0, 1, -1, 0), SDL_FreeSurface);
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if (flipped_surface.get() != nullptr)
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{
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load(flipped_surface.get());
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message << "Loading image at " << path;
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message_level = sb::Log::INFO;
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}
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else
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{
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message << "Error flipping image surface at " << path;
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throw std::runtime_error(sb::Log::sdl_error(message.str()).str());
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}
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}
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else
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{
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message << "Error opening image " << path;
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throw std::runtime_error(sb::Log::sdl_error(message.str()).str());
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}
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}
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else
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{
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message << "Cannot load, " << path << " is not a vaild path to a file";
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message_level = sb::Log::WARN;
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}
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sb::Log::log(message, message_level);
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}
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void Texture::load(SDL_RWops* rw)
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{
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/* Load RW object as path as a surface object to access pixel data and flip into OpenGL orientation. Attach a destructor so it will
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* free itself when it goes out of scope at the end of this function. */
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std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> surface(IMG_Load_RW(rw, 0), SDL_FreeSurface);
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std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> flipped_surface(
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rotozoomSurfaceXY(surface.get(), 0, 1, -1, 0), SDL_FreeSurface);
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load(flipped_surface.get());
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}
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void Texture::load(SDL_Surface* surface)
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{
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std::ostringstream message;
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if (surface->w > 0 && surface->h > 0)
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{
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message << "Loading image from SDL surface (" << surface->w << "×" << surface->h << ", " <<
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SDL_GetPixelFormatName(surface->format->format) << ")";
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sb::Log::log(message, sb::Log::VERBOSE);
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#if defined(__MACOS__)
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load(surface->pixels, {surface->w, surface->h}, GL_BGRA, GL_UNSIGNED_BYTE);
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#else
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load(surface->pixels, {surface->w, surface->h}, GL_RGBA, GL_UNSIGNED_BYTE);
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#endif
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}
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else
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{
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message << "Cannot load into texture, invalid image data without dimensions found";
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sb::Log::log(message, sb::Log::WARN);
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}
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}
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void Texture::load(void* pixels, glm::vec2 size, GLenum format, GLenum type)
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{
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std::ostringstream message;
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sb::Log::Level message_level;
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if (size.x > 0 && size.y > 0)
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{
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if (!generated())
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{
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generate(size);
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}
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bind();
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, size.x, size.y, format, type, pixels);
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message << "Loaded " << size.x << "×" << size.y << " image into texture ID " << id();
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message_level = sb::Log::VERBOSE;
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}
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else
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{
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message << "Cannot load pixels with zero or negative size in either dimension.";
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message_level = sb::Log::WARN;
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}
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sb::Log::log(message, message_level);
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sb::Log::gl_errors("after loading texture");
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}
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void Texture::bind() const
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{
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if (generated())
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{
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glBindTexture(GL_TEXTURE_2D, this->id());
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}
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else
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{
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std::ostringstream message;
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message << "Cannot bind texture that has not been generated yet.";
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if (!path.empty())
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{
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message << " Texture path is " << path << ".";
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}
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throw std::runtime_error(message.str());
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}
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}
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void Texture::load(void* pixels, GLenum format, GLenum type)
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{
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if (generated())
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{
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load(pixels, size(), format, type);
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}
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else
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{
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std::ostringstream message;
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message << "Texture";
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if (!path.empty())
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{
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message << " with path " << path;
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}
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message << " has not been generated and has no size property, so a size must be provided to the load function.";
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throw std::invalid_argument(message.str());
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}
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}
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glm::vec2 Texture::size() const
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{
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if (_size.has_value())
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{
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return *_size;
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}
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else
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{
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std::ostringstream message;
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message << "Texture";
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if (!path.empty())
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{
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message << " with path " << path;
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}
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message << " has not been generated or loaded with a size given, so it currently has no size.";
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throw std::runtime_error(message.str());
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}
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}
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bool Texture::operator==(const Texture& texture) const
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{
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return id() == texture.id();
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}
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/* This function gets passed to the abstract base class for deleting the texture data when the ID
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* pointer goes out of scope (when all instances of this texture and its copies are out of scope) */
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void sb::texture_deleter(GLuint* id)
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{
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/* not sure why SDL_Log works here at program end but SDL_LogDebug and SDL_LogInfo don't */
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SDL_LogVerbose(sb::Log::DEFAULT_CATEGORY, "destroying texture ID %i", *id);
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glDeleteTextures(1, id);
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delete id;
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}
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