Improve emscripten support

src/Nazara/OpenGLRenderer/OpenGLShaderModule.cpp

@@ -174,6 +174,10 @@ namespace Nz
 		m_states = states;
 		m_states.sanitized = true; //< Shader is always sanitized (because of keywords)
 
+#ifdef NAZARA_PLATFORM_WEB
+		m_states.optimize = true; //< Always remove unused code with emscripten (prevents errors on draw calls when no buffer is bound on a unused binding)
+#endif
+
 		nzsl::Ast::SanitizeVisitor::Options options = nzsl::GlslWriter::GetSanitizeOptions();
 		options.optionValues = states.optionValues;
 		options.moduleResolver = states.shaderModuleResolver;

src/Nazara/OpenGLRenderer/Wrapper/Context.cpp

@@ -147,11 +147,14 @@ namespace Nz::GL
 
 	GLenum Context::BindFramebuffer(GLuint fbo) const
 	{
+		// it looks like emscripten wants us to rebind the FBO everytime
+#ifndef NAZARA_PLATFORM_WEB
 		if (m_state.boundDrawFBO == fbo)
 			return GL_DRAW_FRAMEBUFFER;
 		else if (m_state.boundReadFBO == fbo)
 			return GL_READ_FRAMEBUFFER;
 		else
+#endif
 		{
 			if (!SetCurrentContext(this))
 				throw std::runtime_error("failed to activate context");
@@ -166,12 +169,10 @@ namespace Nz::GL
 	void Context::BindFramebuffer(FramebufferTarget target, GLuint fbo) const
 	{
 		auto& currentFbo = (target == FramebufferTarget::Draw) ? m_state.boundDrawFBO : m_state.boundReadFBO;
-#ifdef NAZARA_PLATFORM_WEB
-		constexpr bool isWeb = true;
-#else
-		constexpr bool isWeb = false;
+		// it looks like emscripten wants us to rebind the FBO everytime
+#ifndef NAZARA_PLATFORM_WEB
+		if (currentFbo != fbo)
 #endif
-		if (currentFbo != fbo || isWeb);
 		{
 			if (!SetCurrentContext(this))
 				throw std::runtime_error("failed to activate context");

src/Nazara/Platform/SDL2/WindowImpl.cpp

@@ -194,6 +194,10 @@ namespace Nz
 
 	WindowHandle WindowImpl::GetSystemHandle() const
 	{
+#ifdef NAZARA_PLATFORM_WEB
+		WindowHandle handle;
+		return handle;
+#else
 		SDL_SysWMinfo wmInfo;
 		SDL_VERSION(&wmInfo.version);
 
@@ -256,6 +260,7 @@ namespace Nz
 		}
 
 		return handle;
+#endif
 	}
 
 	bool WindowImpl::HasFocus() const