demotool/ui-utilities.hh

#pragma once
#include "ui-mousectrl.hh"


/*= UI UTILITIES =============================================================*/

namespace ImGui {

	// Disable next ImGui controls
	void PushDisabled( ) noexcept;
	// Re-enable ImGui buttons
	void PopDisabled( ) noexcept;

	/*--------------------------------------------------------------------*/

	// Display a menu item with a checkbox
	bool MenuItemCheckbox(
			char const* name ,
			bool* checked ) noexcept;

	/*--------------------------------------------------------------------*/

	// Display a separator for the toolbar
	void ToolbarSeparator( ) noexcept;

	// Display a toolbar button
	bool ToolbarButton(
			char const* const string ,
			ImVec2 const& size ,
			char const* const tooltip = nullptr ,
			bool enabled = true ) noexcept;

} // namespace ImGui

/*----------------------------------------------------------------------------*/

#define GL_CHECK( FAIL ) \
	do { \
		auto err_( glGetError( ) ); \
		if ( err_ != GL_NO_ERROR ) FAIL; \
	} while ( 0 )

#define GL_ASSERT( ) \
	GL_CHECK({ \
		fprintf( stderr , "GL error %x in %s:%d\n" , \
				err_ , __FILE__ , __LINE__ ); \
		abort( ); \
	})


/*= CAMERA ===================================================================*/

struct T_Camera;

struct T_CameraMouseControl : public A_MouseCtrl
{
	T_Camera& camera;

	explicit T_CameraMouseControl( T_Camera& cam ) : camera( cam ) {}

	void handleDragAndDrop(
			ImVec2 const& move ,
			T_KeyboardModifiers modifiers ,
			T_MouseButtons buttons ) noexcept override;
	void handleWheel(
			float wheel ,
			T_KeyboardModifiers modifiers ,
			T_MouseButtons buttons ) noexcept override;
};

enum class E_CameraChange {
	FOV ,
	MATRIX
};
using T_CameraChanges = T_Flags< E_CameraChange >;

T_CameraChanges CameraUI( T_Camera& camera ) noexcept;