ImGuiGlfwOpenGLBackend.ixx File

GLFW+OpenGL backend implementation for ImGui rendering. More...

Included Headers

#include <cassert> #include <stdexcept> #include "imgui.h" #include "imgui_impl_glfw.h" #include "imgui_impl_opengl3.h" #include <helios.engine.runtime.world.EngineWorld> #include <helios.engine.platform.window.types.WindowHandle> #include <helios.glfw.components.GLFWWindowHandleComponent> #include <helios.imgui.ImGuiBackend>

Namespaces Index

namespace	helios
namespace	imgui
namespace	types
namespace	world
namespace	components

Classes Index

class	ImGuiGlfwOpenGLBackend
	ImGui backend for GLFW windowing and OpenGL 4.1 rendering. More...

Description

GLFW+OpenGL backend implementation for ImGui rendering.

File Listing

The file content with the documentation metadata removed is:

1

5module;

6

7#include <cassert>

8#include <stdexcept>

9

10#include "imgui.h"

11#include "imgui_impl_glfw.h"

12#include "imgui_impl_opengl3.h"

13

14export module helios.imgui.ImGuiGlfwOpenGLBackend;

15

16import helios.imgui.ImGuiBackend;

17import helios.engine.platform.window.types.WindowHandle;

18import helios.engine.runtime.world.EngineWorld;

19

20import helios.glfw.components.GLFWWindowHandleComponent;

21

22using namespace helios::engine::platform::window::types;

23using namespace helios::engine::runtime::world;

24using namespace helios::glfw::components;

25export namespace helios::imgui {

26

37 class ImGuiGlfwOpenGLBackend : public ImGuiBackend {

38

39 private:

40

49 bool initialized_ = false;

50

63 void shutdown() noexcept {

64 if (initialized_) {

65 ImGui_ImplOpenGL3_Shutdown();

66 ImGui_ImplGlfw_Shutdown();

67 ImGui::DestroyContext();

68 initialized_ = false;

69 }

70 }

71

75 WindowHandle windowHandle_;

76

80 PlatformWorld& platformWorld_;

81

90 bool initialize() noexcept {

91

92 if (initialized_) {

93 return true;

94 }

95 auto glfwWindow = platformWorld_.findEntity(windowHandle_);

96

97 if (!glfwWindow) {

98 assert(false && "Expected a valid GLFW window entity");

99 return false;

100 }

101

102 auto glfwComp = glfwWindow->get<GLFWWindowHandleComponent<WindowHandle>>();

103

104 if (!glfwComp) {

105 return false;

106 }

107

108 if (!ImGui_ImplGlfw_InitForOpenGL(glfwComp->handle, true)) {

109 ImGui::DestroyContext();

110 assert(false && "Failed to initialize GLFW backend for ImGui");

111 return false;

112 }

113

114 if (!ImGui_ImplOpenGL3_Init("#version 410")) {

115 ImGui_ImplGlfw_Shutdown();

116 ImGui::DestroyContext();

117 assert(false && "Failed to initialize OpenGL 4.1 backend for ImGui");

118 return false;

119 }

120 initialized_ = true;

121 return true;

122 }

123

124 public:

125

126 // No copy, no move (manages global ImGui context).

127 ImGuiGlfwOpenGLBackend(const ImGuiGlfwOpenGLBackend&) = delete;

128 ImGuiGlfwOpenGLBackend& operator=(const ImGuiGlfwOpenGLBackend&) = delete;

129 ImGuiGlfwOpenGLBackend(ImGuiGlfwOpenGLBackend&& other) noexcept = delete;

130 ImGuiGlfwOpenGLBackend& operator=(ImGuiGlfwOpenGLBackend&& other) noexcept = delete;

131

140 explicit ImGuiGlfwOpenGLBackend(WindowHandle window, PlatformWorld& platformWorld)

141 : windowHandle_(window), platformWorld_(platformWorld) {

142

143 if (ImGui::GetCurrentContext()) {

144 throw std::runtime_error("ImGui context already initialized");

145 }

146

147 IMGUI_CHECKVERSION();

148 ImGui::CreateContext();

149 ImGuiIO& io = ImGui::GetIO();

150 io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;

151 io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;

152

153 ImGui::StyleColorsDark();

154 }

155

163 void renderDrawData(ImDrawData* drawData) override {

164 if (initialized_) {

165 ImGui_ImplOpenGL3_RenderDrawData(drawData);

166 }

167 }

168

174 bool newFrame() override {

175

176 if (!initialize()) {

177 return false;

178 }

179

180

181 ImGui_ImplOpenGL3_NewFrame();

182 ImGui_ImplGlfw_NewFrame();

183 ImGui::NewFrame();

184

185 return true;

186 }

187

193 ~ImGuiGlfwOpenGLBackend() override {

194 shutdown();

195 }

196

197 };

198

199}

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