[nostalgia/core] Get building with GLFW (it has a better Conan package than SDL)

src/nostalgia/core/glfw/CMakeLists.txt

@@ -0,0 +1,21 @@
+add_library(
+	NostalgiaCore-GLFW
+		core.cpp
+		gfx.cpp
+)
+
+find_package(glfw3 REQUIRED)
+
+target_link_libraries(
+	NostalgiaCore-GLFW PUBLIC
+		glfw::glfw
+		NostalgiaCore-Userspace
+)
+
+install(
+	TARGETS
+		NostalgiaCore-GLFW
+	DESTINATION
+		LIBRARY DESTINATION lib/nostalgia
+		ARCHIVE DESTINATION lib/nostalgia
+)

src/nostalgia/core/glfw/core.cpp

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2016 - 2021 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <GLFW/glfw3.h>
+
+#include <nostalgia/core/config.hpp>
+#include <nostalgia/core/core.hpp>
+#include <nostalgia/core/gfx.hpp>
+#include <nostalgia/core/input.hpp>
+
+#include "core.hpp"
+
+namespace nostalgia::core {
+
+static event_handler g_eventHandler = nullptr;
+static uint64_t g_wakeupTime;
+
+void draw(Context *ctx);
+
+ox::Error init(Context *ctx) noexcept {
+	const auto id = new GlfwImplData;
+	ctx->setWindowerData(id);
+	using namespace std::chrono;
+	id->startTime = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
+	glfwInit();
+	oxReturnError(initGfx(ctx));
+	return OxError(0);
+}
+
+static void handleGlfwKeyEvent(GLFWwindow *window, int key, int, int action, int) {
+	const auto ctx = ox::bit_cast<Context*>(glfwGetWindowUserPointer(window));
+	const auto id = ctx->windowerData<GlfwImplData>();
+	switch (action) {
+		case GLFW_PRESS:
+			switch (key) {
+				case GLFW_KEY_Q:
+					id->running = false;
+					break;
+			}
+			break;
+	}
+}
+
+ox::Error run(Context *ctx) noexcept {
+	const auto id = ctx->windowerData<GlfwImplData>();
+	id->running = true;
+	// try adaptive vsync
+	//if (SDL_GL_SetSwapInterval(config::SdlVsyncOption) < 0) {
+	//	oxTrace("nostalgia::core::sdl", "Could not enable adaptive vsync, falling back on vsync");
+	//	SDL_GL_SetSwapInterval(1); // fallback on normal vsync
+	//}
+	glfwSetKeyCallback(id->window, handleGlfwKeyEvent);
+	while (id->running && !glfwWindowShouldClose(id->window)) {
+		glfwPollEvents();
+		const auto ticks = ticksMs(ctx);
+		if (g_wakeupTime <= ticks && g_eventHandler) {
+			auto sleepTime = g_eventHandler(ctx);
+			if (sleepTime >= 0) {
+				g_wakeupTime = ticks + static_cast<unsigned>(sleepTime);
+			} else {
+				g_wakeupTime = ~uint64_t(0);
+			}
+		}
+		draw(ctx);
+		glfwSwapBuffers(id->window);
+	}
+	return OxError(0);
+}
+
+void setEventHandler(Context *ctx, event_handler h) noexcept {
+	const auto id = ctx->windowerData<GlfwImplData>();
+	id->eventHandler = h;
+}
+
+uint64_t ticksMs(Context *ctx) noexcept {
+	using namespace std::chrono;
+	const auto id = ctx->windowerData<GlfwImplData>();
+	const auto now = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
+	return static_cast<uint64_t>(now - id->startTime);
+}
+
+bool buttonDown(Key) noexcept {
+	return false;
+}
+
+}

src/nostalgia/core/glfw/core.hpp

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2016 - 2021 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <nostalgia/core/core.hpp>
+
+namespace nostalgia::core {
+
+struct GlfwImplData {
+	class GLFWwindow *window = nullptr;
+	int64_t startTime = 0;
+	bool running = false;
+	event_handler eventHandler = nullptr;
+};
+
+}

src/nostalgia/core/glfw/gfx.cpp

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2016 - 2021 gary@drinkingtea.net
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <array>
+
+#include <GLFW/glfw3.h>
+
+#include <ox/claw/read.hpp>
+
+#include <nostalgia/core/gfx.hpp>
+#include <nostalgia/core/userland/gfx.hpp>
+
+#include "core.hpp"
+
+namespace nostalgia::core {
+
+constexpr auto Scale = 5;
+
+static void handleGlfwError(int err, const char *desc) {
+    oxErrf("GLFW error ({}): {}", err, desc);
+}
+
+ox::Error initGfx(Context *ctx) noexcept {
+	auto id = ctx->windowerData<GlfwImplData>();
+	glfwSetErrorCallback(handleGlfwError);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+	glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
+	id->window = glfwCreateWindow(240 * Scale, 160 * Scale, "nostalgia", nullptr, nullptr);
+	if (id->window == nullptr) {
+		return OxError(1, "Could not open GLFW window");
+	}
+	glfwSetWindowUserPointer(id->window, ctx);
+	glfwMakeContextCurrent(id->window);
+	oxReturnError(renderer::init(ctx));
+	return OxError(0);
+}
+
+ox::Error shutdownGfx(Context *ctx) noexcept {
+	oxReturnError(renderer::shutdown(ctx));
+	auto id = ctx->windowerData<GlfwImplData>();
+	glfwDestroyWindow(id->window);
+	ctx->setWindowerData(nullptr);
+	delete id;
+	return OxError(0);
+}
+
+int getScreenWidth(Context *ctx) noexcept {
+	auto id = ctx->windowerData<GlfwImplData>();
+	int w = 0, h = 0;
+	glfwGetFramebufferSize(id->window, &w, &h);
+	return w;
+}
+
+int getScreenHeight(Context *ctx) noexcept {
+	auto id = ctx->windowerData<GlfwImplData>();
+	int w = 0, h = 0;
+	glfwGetFramebufferSize(id->window, &w, &h);
+	return h;
+}
+
+common::Size getScreenSize(Context *ctx) noexcept {
+	auto id = ctx->windowerData<GlfwImplData>();
+	int w = 0, h = 0;
+	glfwGetFramebufferSize(id->window, &w, &h);
+	return {w, h};
+}
+
+}