bgfx/examples/23-vectordisplay/main.cpp

/*
 * Copyright 2014 Kai Jourdan. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
 *
 */

#include "common.h"
#include "bgfx_utils.h"

#include "vectordisplay.h"

struct PosColorVertex
{
	float m_x;
	float m_y;
	float m_z;
	uint32_t m_abgr;

	static void init()
	{
		ms_decl
		.begin()
		.add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float)
		.add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true)
		.end();
	}

	static bgfx::VertexDecl ms_decl;
};

bgfx::VertexDecl PosColorVertex::ms_decl;

class ExampleVectorDisplay : 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);
		
		const bgfx::RendererType::Enum renderer = bgfx::getRendererType();
		float texelHalf = bgfx::RendererType::Direct3D9 == renderer ? 0.5f : 0.0f;
		bool originBottomLeft = bgfx::RendererType::OpenGL == renderer
		|| bgfx::RendererType::OpenGLES == renderer;
		m_vd.init(originBottomLeft, texelHalf);
		m_vd.setup(uint16_t(m_width), uint16_t(m_height) );
		
		// 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);
		
		// Create vertex stream declaration.
		PosColorVertex::init();
		
		
		m_oldWidth = m_width;
		m_oldHeight = m_height;
	}

	virtual int shutdown() BX_OVERRIDE
	{
		// Cleanup.
		m_vd.teardown();
		
		// Shutdown bgfx.
		bgfx::shutdown();
		
		return 0;
	}
	
	bool update() BX_OVERRIDE
	{
		if (!entry::processEvents(m_width, m_height, m_debug, m_reset) )
		{
			if (m_oldWidth  != m_width
				||  m_oldHeight != m_height)
			{
				m_oldWidth  = m_width;
				m_oldHeight = m_height;
				m_vd.resize(uint16_t(m_width), uint16_t(m_height) );
			}
			
			const float at[3] = { 0.0f, 0.0f, 0.0f };
			const float eye[3] = { 0.0f, 0.0f, -35.0f };
			
			float view[16];
			float proj[16];
			bx::mtxLookAt(view, eye, at);
			bx::mtxProj(proj, 60.0f, float(m_width) / float(m_height), 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth);
			// Set view and projection matrix for view 0.
			bgfx::setViewTransform(0, view, proj);
			
			// 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);
			
			int64_t now = bx::getHPCounter();
			static int64_t last = now;
			const int64_t frameTime = now - last;
			last = now;
			const double freq = double(bx::getHPFrequency() );
			const double toMs = 1000.0 / freq;
			
			// Use debug font to print information about this example.
			bgfx::dbgTextClear();
			bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/23-vectordisplay");
			bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Rendering lines as oldschool vectors.");
			bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime) * toMs);
			
			m_vd.beginFrame();
			
			//simplex test
			m_vd.setDrawColor(0.7f, 0.7f, 1.0f);
			m_vd.drawSimplexFont(50.0f,  80.0f, 1.5f, "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
			m_vd.drawSimplexFont(50.0f, 140.0f, 1.5f, "abcdefghijklmnopqrstuvwxyz");
			m_vd.drawSimplexFont(50.0f, 200.0f, 1.5f, "!@#$%^&*()-=<>/?;:'\"{}[]|\\+=-_");
			
			m_vd.setDrawColor(1.0f, 0.7f, 0.7f);
			
			//test pattern for lines
			for (int ii = 0; ii < 4; ii++)
			{
				for (int jj = 0; jj < ii; jj++) //draw more intensive lines
				{
					m_vd.drawLine(50.0f, 350.0f + 40 * ii, 200.0f, 350.0f + 40 * ii);
				}
			}
			
			for (int ii = 0; ii < 4; ii++)
			{
				for (int jj = 0; jj <= ii; jj++)
				{
					m_vd.drawLine(50.0f + 40 * ii, 600.0f, 50.0f + 40 * ii, 700.0f);
				}
			}
			
			//
			// test pattern for shapes
			//
			m_vd.setDrawColor(0.7f, 0.7f, 1.0f);
			m_vd.drawCircle(250.0f, 450.0f, 10.0f, 32.0f);
			m_vd.drawCircle(300.0f, 450.0f, 30.0f, 32.0f);
			m_vd.drawCircle(400.0f, 450.0f, 60.0f, 32.0f);
			m_vd.drawCircle(500.0f, 450.0f, 80.0f, 64.0f);
			
			m_vd.setDrawColor(0.7f, 1.0f, 0.7f);
			m_vd.drawBox(250.0f, 600.0f, 10.0f, 10.0f);
			m_vd.drawBox(300.0f, 600.0f, 30.0f, 30.0f);
			m_vd.drawBox(350.0f, 600.0f, 60.0f, 60.0f);
			m_vd.drawBox(450.0f, 600.0f, 80.0f, 80.0f);
			
			m_vd.setDrawColor(1.0f, 0.7f, 1.0f);
			m_vd.drawWheel(bx::kPi, 800.0f, 450.0f, 80.0f);
			m_vd.drawWheel(3.0f * bx::kPi / 4.0f, 95.0f, 450.0f, 60.0f);
			m_vd.drawWheel(bx::kPi / 2.0f, 1150.0f, 450.0f, 30.0f);
			m_vd.drawWheel(bx::kPi / 4.0f, 1250.0f, 450.0f, 10.0f);
			
			// draw moving shape
			static float counter = 0.0f;
			counter += 0.01f;
			float posX = m_width  / 2.0f + bx::fsin(counter * 3.18378f) * (m_width / 2.0f);
			float posY = m_height / 2.0f + bx::fcos(counter) * (m_height / 2.0f);
			m_vd.drawCircle(posX, posY, 5.0f, 10.0f);
			
			m_vd.endFrame();
			
			// 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;
	VectorDisplay m_vd;
	
	uint32_t m_oldWidth;
	uint32_t m_oldHeight;
};

ENTRY_IMPLEMENT_MAIN(ExampleVectorDisplay);