Single glContext shared between windows

Created by the first window, includes simplified refresh/render for single control point

4 files changed, 44 insertions, 16 deletions

diff --git a/ui/gameMainWindow.cpp b/ui/gameMainWindow.cpp
index 4421098..7d5e19b 100644
--- a/ui/gameMainWindow.cpp
+++ b/ui/gameMainWindow.cpp
@@ -33,9 +33,8 @@ GameMainWindow::tick(TickDuration)
 }
 
 void
-GameMainWindow::Refresh(const GameState * gameState) const
+GameMainWindow::render(const GameState * gameState) const
 {
-	SDL_GL_MakeCurrent(m_window, m_glContext);
 	glEnable(GL_DEPTH_TEST);
 	gameState->world.apply<Renderable>(&Renderable::render, shader);
 	glDisable(GL_DEPTH_TEST);
diff --git a/ui/gameMainWindow.h b/ui/gameMainWindow.h
index affb389..124d776 100644
--- a/ui/gameMainWindow.h
+++ b/ui/gameMainWindow.h
@@ -16,7 +16,7 @@ public:
 
 	void tick(TickDuration) override;
 
-	void Refresh(const GameState * gameState) const override;
+	void render(const GameState * gameState) const override;
 
 private:
 	UIShader uiShader;
diff --git a/ui/window.cpp b/ui/window.cpp
index c451367..2dc0c2a 100644
--- a/ui/window.cpp
+++ b/ui/window.cpp
@@ -1,32 +1,42 @@
 #include "window.h"

 #include "ui/inputHandler.h"

 #include <GL/glew.h>

+#include <optional>

 #include <stdexcept>

 

-Window::Window(int width, int height, const std::string & title) :

-	m_window {title.c_str(), static_cast<int>(SDL_WINDOWPOS_CENTERED), static_cast<int>(SDL_WINDOWPOS_CENTERED), width,

-			height, static_cast<Uint32>(SDL_WINDOW_OPENGL)},

-	m_glContext {m_window}

+static SDL_GLContext

+SDL_GL_CreateContextAndGlewInit(SDL_Window * w)

 {

+	auto ctx = SDL_GL_CreateContext(w);

 	if (glewInit() != GLEW_OK) {

 		throw std::runtime_error {"Glew failed to initialize!"};

 	}

-

 	glEnable(GL_CULL_FACE);

 	glCullFace(GL_BACK);

 	glEnable(GL_BLEND);

 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

+	return ctx;

+}

+

+using GL_Context = std::remove_pointer_t<SDL_GLContext>;

+using SDL_GLContextPtr = wrapped_ptrt<GL_Context, SDL_GL_CreateContextAndGlewInit, SDL_GL_DeleteContext>;

+

+Window::Window(int width, int height, const std::string & title) :

+	m_window {title.c_str(), static_cast<int>(SDL_WINDOWPOS_CENTERED), static_cast<int>(SDL_WINDOWPOS_CENTERED), width,

+			height, static_cast<Uint32>(SDL_WINDOW_OPENGL)}

+{

+	glContext();

 }

 

 void

-Window::Clear(float r, float g, float b, float a) const

+Window::clear(float r, float g, float b, float a) const

 {

 	glClearColor(r, g, b, a);

 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

 }

 

 void

-Window::SwapBuffers() const

+Window::swapBuffers() const

 {

 	SDL_GL_SwapWindow(m_window);

 }

@@ -40,3 +50,21 @@ Window::handleInput(const SDL_Event & e)
 	}

 	return false;

 }

+

+SDL_GLContext

+Window::glContext() const

+{

+	static SDL_GLContextPtr m_glContext {m_window};

+	return m_glContext;

+}

+

+void

+Window::refresh(const GameState * gameState) const

+{

+	SDL_GL_MakeCurrent(m_window, glContext());

+	clear(0.0F, 0.0F, 0.0F, 1.0F);

+

+	render(gameState);

+

+	swapBuffers();

+}

diff --git a/ui/window.h b/ui/window.h
index f6279e2..8bfc9c3 100644
--- a/ui/window.h
+++ b/ui/window.h
@@ -20,18 +20,19 @@ public:
 	NO_COPY(Window);

 	NO_MOVE(Window);

 

-	void Clear(float r, float g, float b, float a) const;

-	void SwapBuffers() const;

 	virtual void tick(TickDuration elapsed) = 0;

-	virtual void Refresh(const GameState *) const = 0;

+	void refresh(const GameState *) const;

 	bool handleInput(const SDL_Event & e);

 

+	void clear(float r, float g, float b, float a) const;

+	void swapBuffers() const;

+

 protected:

-	using GL_Context = std::remove_pointer_t<SDL_GLContext>;

+	SDL_GLContext glContext() const;

+	virtual void render(const GameState *) const = 0;

+

 	using SDL_WindowPtr = wrapped_ptrt<SDL_Window, SDL_CreateWindow, SDL_DestroyWindow>;

-	using SDL_GLContextPtr = wrapped_ptrt<GL_Context, SDL_GL_CreateContext, SDL_GL_DeleteContext>;

 	SDL_WindowPtr m_window;

-	SDL_GLContextPtr m_glContext;

 	Collection<InputHandler> inputStack;

 };