bgfx/examples/00-helloworld/helloworld.cpp

/*
 * Copyright 2011-2016 Branimir Karadzic. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
 */

#include <bx/uint32_t.h>
#include "common.h"
#include "bgfx_utils.h"
#include "logo.h"

class ExampleHelloWorld : public entry::AppI
{
	void init(int _argc, char** _argv) BX_OVERRIDE
	{
		Args args(_argc, _argv);

		m_width  = 1280;
		m_height = 720;
		m_debug  = BGFX_DEBUG_TEXT;
		m_reset  = BGFX_RESET_VSYNC;

		bgfx::init(args.m_type, args.m_pciId);
		bgfx::reset(m_width, m_height, m_reset);

		// Enable debug text.
		bgfx::setDebug(m_debug);

		// Set view 0 clear state.
		bgfx::setViewClear(0
				, BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH
				, 0x303030ff
				, 1.0f
				, 0
				);
	}

	virtual int shutdown() BX_OVERRIDE
	{
		// Shutdown bgfx.
		bgfx::shutdown();

		return 0;
	}

	bool update() BX_OVERRIDE
	{
		if (!entry::processEvents(m_width, m_height, m_debug, m_reset) )
		{
			// Set view 0 default viewport.
			bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );

			// This dummy draw call is here to make sure that view 0 is cleared
			// if no other draw calls are submitted to view 0.
			bgfx::touch(0);

			// Use debug font to print information about this example.
			bgfx::dbgTextClear();
			bgfx::dbgTextImage(bx::uint16_max(uint16_t(m_width /2/8 ), 20)-20
							 , bx::uint16_max(uint16_t(m_height/2/16), 6)-6
							 , 40
							 , 12
							 , s_logo
							 , 160
							 );
			bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/00-helloworld");
			bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Initialization and debug text.");

			bgfx::dbgTextPrintf(0, 4, 0x0f, "Color can be changed with ANSI \e[9;me\e[10;ms\e[11;mc\e[12;ma\e[13;mp\e[14;me\e[0m code too.");

			const bgfx::Stats* stats = bgfx::getStats();
			bgfx::dbgTextPrintf(0, 6, 0x0f, "Backbuffer %dW x %dH in pixels, debug text %dW x %dH in characters."
					, stats->width
					, stats->height
					, stats->textWidth
					, stats->textHeight
					);

			// Advance to next frame. Rendering thread will be kicked to
			// process submitted rendering primitives.
			bgfx::frame();

			return true;
		}

		return false;
	}

	uint32_t m_width;
	uint32_t m_height;
	uint32_t m_debug;
	uint32_t m_reset;
};

ENTRY_IMPLEMENT_MAIN(ExampleHelloWorld);