Robert Cranston authored on 12/10/2021 04:08:43
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new file mode 100644 |
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+/// Guards |
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+ |
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+ |
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+#ifdef GLBACKEND_GLFW |
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+ |
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+ |
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+/// Includes |
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+ |
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+ |
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+#include <glbackend_glfw.hpp> |
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+ |
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+#include <array> |
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+#include <functional> |
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+#include <limits> |
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+#include <sstream> |
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+#include <string> |
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+#include <type_traits> |
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+#include <utility> |
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+ |
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+#include <glbase.hpp> |
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+#include <glbackend.hpp> |
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+ |
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+#include <GLFW/glfw3.h> |
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+ |
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+// NOLINTNEXTLINE |
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+#define STR_EXCEPTION GLBase::Exception |
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+#include <str.hpp> |
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+ |
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+ |
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+/// Special member functions |
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+ |
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+ |
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+GLBackendGLFW::GLBackendGLFW( |
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+ std::string const & title, |
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+ std::array<int, 2> size, |
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+ std::array<int, 2> version, |
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+ int samples, |
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+ bool fullscreen, |
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+ bool transparent |
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+) |
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+: |
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+ GLBackend(), |
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+ window_{nullptr}
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+{
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+ //// Backend errors |
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+ glfwSetErrorCallback(debug_glfw_error_callback_); |
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+ auto const glfw_get_error_description = []() |
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+ {
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+ char const * description{};
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+ glfwGetError(&description); |
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+ return description; |
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+ }; |
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+ |
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+ //// Backend init |
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+ if (!glfwInit()) |
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+ STR_THROW( |
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+ "Failed to initialize GLFW" << ":\n" << |
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+ glfw_get_error_description() |
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+ ); |
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+ ++init_count_; |
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+ |
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+ //// Window options |
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+ glfwDefaultWindowHints(); |
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+ glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE); |
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+ GLFWmonitor * monitor = nullptr; |
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+ if (fullscreen) |
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+ monitor = glfwGetPrimaryMonitor(); |
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+ if (transparent) |
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+ {
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+ glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, GLFW_TRUE); |
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+ glfwWindowHint(GLFW_DECORATED, GLFW_FALSE); |
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+ glfwWindowHint(GLFW_FLOATING, GLFW_TRUE); |
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+ } |
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+ if (size[0] == 0 || size[1] == 0) |
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+ {
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+ auto const * mode = glfwGetVideoMode(glfwGetPrimaryMonitor()); |
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+ size[0] = mode->width; |
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+ size[1] = mode->height; |
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+ } |
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+ size_ = size; |
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+ |
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+ //// Context options |
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+ glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_TRUE); |
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+ glfwWindowHint(GLFW_RED_BITS, 8); // NOLINT |
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+ glfwWindowHint(GLFW_GREEN_BITS, 8); // NOLINT |
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+ glfwWindowHint(GLFW_BLUE_BITS, 8); // NOLINT |
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+ glfwWindowHint(GLFW_ALPHA_BITS, 8); // NOLINT |
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+ glfwWindowHint(GLFW_DEPTH_BITS, 24); // NOLINT |
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+ glfwWindowHint(GLFW_STENCIL_BITS, 8); // NOLINT |
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+ if (samples) |
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+ glfwWindowHint(GLFW_SAMPLES, samples); |
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+ if (version[0]) |
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+ glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, version[0]); |
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+ if (version[1]) |
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+ glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, version[1]); |
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+ if ((version[0] == 3 && version[1] >= 2) || version[0] >= 4) // NOLINT |
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+ {
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+ glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); |
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+ glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE); |
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+ } |
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+ if (debug() >= 1) |
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+ glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE); |
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+ else if (version[0] >= 2) // NOLINT |
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+ glfwWindowHint(GLFW_CONTEXT_NO_ERROR, GLFW_TRUE); |
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+ |
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+ try |
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+ {
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+ //// Window |
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+ window_ = glfwCreateWindow( |
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+ size[0], |
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+ size[1], |
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+ title.c_str(), |
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+ monitor, |
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+ nullptr |
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+ ); |
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+ if (!window_) |
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+ STR_THROW( |
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+ "Failed to create GLFW window" << ":\n" << |
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+ glfw_get_error_description() |
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+ ); |
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+ |
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+ //// Context |
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+ glfwMakeContextCurrent(window_); |
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+ if (debug() == 0) |
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+ glfwSwapInterval(1); |
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+ init_(); |
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+ |
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+ //// Lock |
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+ if (fullscreen) |
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+ lock(true); |
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+ } |
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+ catch (...) |
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+ {
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+ destroy_(); |
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+ throw; |
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+ } |
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+ |
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+ //// Callbacks |
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+ // NOLINTNEXTLINE |
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+ #define GLBACKEND_GLFW_SELF_(WINDOW) \ |
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+ (*static_cast<GLBackendGLFW *>(glfwGetWindowUserPointer(WINDOW))) |
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+ glfwSetWindowUserPointer(window_, this); |
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+ glfwSetKeyCallback( |
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+ window_, |
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+ []( |
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+ GLFWwindow * window, |
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+ int key, |
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+ int scancode, |
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+ int action, |
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+ int mods |
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+ ) |
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+ {
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+ (void)scancode; |
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+ (void)mods; |
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+ if (action != GLFW_PRESS) |
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+ return; |
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+ auto & self = GLBACKEND_GLFW_SELF_(window); |
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+ if (self.callback_key_) |
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+ {
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+ if(key == GLFW_KEY_LEFT) |
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+ self.callback_key_("Left");
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+ else if (key == GLFW_KEY_RIGHT) |
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+ self.callback_key_("Right");
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+ else if (key == GLFW_KEY_UP) |
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+ self.callback_key_("Up");
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+ else if (key == GLFW_KEY_DOWN) |
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+ self.callback_key_("Down");
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+ else if (key == GLFW_KEY_ENTER) |
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+ self.callback_key_("Enter");
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+ else if (key == GLFW_KEY_ESCAPE) |
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+ self.callback_key_("Escape");
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+ else if (key == GLFW_KEY_TAB) |
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+ self.callback_key_("Tab");
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+ else if (key == GLFW_KEY_BACKSPACE) |
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+ self.callback_key_("Backspace");
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+ else if ( |
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+ key == GLFW_KEY_RIGHT_CONTROL || |
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+ key == GLFW_KEY_LEFT_CONTROL |
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+ ) |
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+ self.callback_key_("Control");
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+ else if ( |
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+ key == GLFW_KEY_RIGHT_SHIFT || |
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+ key == GLFW_KEY_LEFT_SHIFT |
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+ ) |
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+ self.callback_key_("Shift");
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+ else if ( |
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+ key == GLFW_KEY_RIGHT_ALT || |
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+ key == GLFW_KEY_LEFT_ALT |
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+ ) |
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+ self.callback_key_("Alt");
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+ else if ( |
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+ 0 <= key && key <= std::numeric_limits<char>::max() |
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+ ) |
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+ self.callback_key_(std::string(1, (char)key)); |
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+ } |
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+ } |
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+ ); |
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+ glfwSetMouseButtonCallback( |
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+ window_, |
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+ []( |
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+ GLFWwindow * window, |
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+ int button, |
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+ int action, |
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+ int mods |
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+ ) |
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+ {
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+ (void)mods; |
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+ if (action != GLFW_PRESS) |
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+ return; |
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+ auto & self = GLBACKEND_GLFW_SELF_(window); |
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+ if (self.callback_button_) |
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+ self.callback_button_(button); |
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+ } |
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+ ); |
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+ glfwSetScrollCallback( |
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+ window_, |
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+ []( |
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+ GLFWwindow * window, |
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+ double scroll_x, |
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+ double scroll_y |
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+ ) |
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+ {
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+ auto & self = GLBACKEND_GLFW_SELF_(window); |
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+ self.scroll_ = {
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+ (float)scroll_x, |
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+ (float)scroll_y, |
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+ }; |
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+ if (self.callback_scroll_) |
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+ self.callback_scroll_(self.scroll_); |
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+ } |
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+ ); |
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+ glfwSetCursorPosCallback( |
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+ window_, |
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+ []( |
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+ GLFWwindow * window, |
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+ double x, |
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+ double y |
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+ ) |
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+ {
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+ auto & self = GLBACKEND_GLFW_SELF_(window); |
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+ self.move_ = {
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+ (float)x - self.position_[0], |
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+ (float)y - self.position_[1], |
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+ }; |
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+ self.position_ = {
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+ (float)x, |
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+ (float)y, |
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+ }; |
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+ if (self.callback_position_) |
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+ self.callback_position_(self.position_); |
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+ if (self.callback_move_) |
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+ self.callback_move_(self.move_); |
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+ } |
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+ ); |
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+ glfwSetFramebufferSizeCallback( |
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+ window_, |
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+ []( |
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+ GLFWwindow * window, |
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+ int width, |
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+ int height |
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+ ) |
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+ {
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+ auto & self = GLBACKEND_GLFW_SELF_(window); |
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+ self.size_ = {
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+ width, |
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+ height, |
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+ }; |
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+ if (self.callback_size_) |
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+ self.callback_size_(self.size_); |
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+ } |
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+ ); |
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+} |
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+ |
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+ |
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+GLBackendGLFW::GLBackendGLFW(GLBackendGLFW && other) noexcept |
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+: |
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+ GLBackend(std::move(other)), |
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+ window_{other.window_}
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+{
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+ other.window_ = nullptr; |
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+} |
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+ |
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+ |
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+GLBackendGLFW::~GLBackendGLFW() |
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+{
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+ destroy_(); |
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+} |
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+ |
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+ |
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+void GLBackendGLFW::destroy_() |
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+{
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+ if (window_) |
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+ {
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+ lock(false); |
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+ glfwDestroyWindow(window_); |
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+ } |
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+ if (--init_count_ == 0) |
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+ glfwTerminate(); |
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+} |
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+ |
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+ |
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+GLBASE_GLOBAL(GLBackendGLFW::init_count_, {0})
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+ |
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+ |
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+/// Debug |
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+ |
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+ |
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+std::string GLBackendGLFW::debug_info() const |
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+{
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+ auto ostream = std::ostringstream{};
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+ |
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+ auto version_major = int{};
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+ auto version_minor = int{};
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+ auto version_rev = int{};
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+ glfwGetVersion( |
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+ &version_major, |
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+ &version_minor, |
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+ &version_rev |
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+ ); |
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+ debug_info_(ostream, "GLFW", {
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+ {
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+ "VERSION_COMPILED", |
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+ glfwGetVersionString() |
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+ }, |
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+ {
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+ "VERSION_LINKED", |
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+ std::to_string(version_major) + "." + |
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+ std::to_string(version_minor) + "." + |
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+ std::to_string(version_rev), |
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+ }, |
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+ }); |
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+ |
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+ ostream << GLBackend::debug_info(); |
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+ |
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+ return ostream.str(); |
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+} |
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+ |
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+ |
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+void GLBackendGLFW::debug_glfw_error_callback_( |
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+ int error, |
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+ char const * message |
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+) |
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+{
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+ auto ostream = std::ostringstream{};
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+ ostream << std::hex << std::showbase; |
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+ |
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+ // https://www.glfw.org/docs/3.3/group__errors.html |
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+ ostream << "GLFW error "; |
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+ // NOLINTNEXTLINE |
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+ #define GLBACKEND_GLFW_CALLBACK_CASE_(VALUE) \ |
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+ case GLFW_ ## VALUE: \ |
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+ ostream << #VALUE; \ |
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+ break; |
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+ switch(error) |
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+ {
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+ GLBACKEND_GLFW_CALLBACK_CASE_(NOT_INITIALIZED) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(NO_CURRENT_CONTEXT) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(INVALID_ENUM) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(INVALID_VALUE) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(OUT_OF_MEMORY) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(API_UNAVAILABLE) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(VERSION_UNAVAILABLE) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(PLATFORM_ERROR) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(FORMAT_UNAVAILABLE) |
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+ GLBACKEND_GLFW_CALLBACK_CASE_(NO_WINDOW_CONTEXT) |
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+ default: |
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+ ostream << error; |
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+ } |
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+ ostream << ":\n"; |
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+ |
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+ ostream << message; |
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+ |
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+ debug_callback()(ostream.str()); |
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+} |
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+ |
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+ |
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+/// Guards |
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+ |
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+ |
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+#endif |
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