11-fontsdf to entry::AppI (#1155)

examples/11-fontsdf/fontsdf.cpp

@@ -31,223 +31,270 @@ TrueTypeHandle loadTtf(FontManager* _fm, const char* _filePath)
 	return invalid;
 }
 
-int _main_(int _argc, char** _argv)
+class ExampleFontSDF : public entry::AppI
 {
-	Args args(_argc, _argv);
-
-	uint32_t width = 1280;
-	uint32_t height = 720;
-	uint32_t debug = BGFX_DEBUG_TEXT;
-	uint32_t reset = BGFX_RESET_VSYNC;
-
-	bgfx::init(args.m_type, args.m_pciId);
-	bgfx::reset(width, height, reset);
-
-	// Enable debug text.
-	bgfx::setDebug(debug);
-
-	// Set view 0 clear state.
-	bgfx::setViewClear(0
-		, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH
-		, 0x303030ff
-		, 1.0f
-		, 0
-		);
-
-	// Imgui.
-	imguiCreate();
-
-	char* bigText = (char*)load("text/sherlock_holmes_a_scandal_in_bohemia_arthur_conan_doyle.txt");
-
-	// Init the text rendering system.
-	FontManager* fontManager = new FontManager(512);
-	TextBufferManager* textBufferManager = new TextBufferManager(fontManager);
-
-	TrueTypeHandle font = loadTtf(fontManager, "font/special_elite.ttf");
-
-	// Create a distance field font.
-	FontHandle fontSdf = fontManager->createFontByPixelSize(font, 0, 48, FONT_TYPE_DISTANCE);
-
-	// Create a scaled down version of the same font (without adding anything to the atlas).
-	FontHandle fontScaled = fontManager->createScaledFontToPixelSize(fontSdf, 14);
-
-	TextLineMetrics metrics(fontManager->getFontInfo(fontScaled) );
-	uint32_t lineCount = metrics.getLineCount(bigText);
-
-	float visibleLineCount = 20.0f;
-
-	const char* textBegin = 0;
-	const char* textEnd = 0;
-	metrics.getSubText(bigText, 0, (uint32_t)visibleLineCount, textBegin, textEnd);
-
-	TextBufferHandle scrollableBuffer = textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, BufferType::Transient);
-	textBufferManager->setTextColor(scrollableBuffer, 0xFFFFFFFF);
-
-	textBufferManager->appendText(scrollableBuffer, fontScaled, textBegin, textEnd);
-
-	entry::MouseState mouseState;
-	int32_t scrollArea = 0;
-	const int32_t guiPanelWidth = 250;
-	const int32_t guiPanelHeight = 200;
-	float textScroll = 0.0f;
-	float textRotation = 0.0f;
-	float textScale = 1.0f;
-	float textSize = 14.0f;
-
-	while (!entry::processEvents(width, height, debug, reset, &mouseState) )
+	void init(int _argc, char** _argv) BX_OVERRIDE
 	{
-		imguiBeginFrame(mouseState.m_mx
-			, mouseState.m_my
-			, (mouseState.m_buttons[entry::MouseButton::Left  ] ? IMGUI_MBUT_LEFT   : 0)
-			| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT  : 0)
-			| (mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
-			, mouseState.m_mz
-			, uint16_t(width)
-			, uint16_t(height)
-		);
-
-		imguiBeginScrollArea("Text Area"
-			, width - guiPanelWidth - 10
-			, 10
-			, guiPanelWidth
-			, guiPanelHeight
-			, &scrollArea
-			);
-		imguiSeparatorLine();
-
-		bool recomputeVisibleText = false;
-		recomputeVisibleText |= imguiSlider("Number of lines", visibleLineCount, 1.0f, 177.0f , 1.0f);
-		if (imguiSlider("Font size", textSize, 6.0f, 64.0f , 1.0f) )
-		{
-			fontManager->destroyFont(fontScaled);
-			fontScaled = fontManager->createScaledFontToPixelSize(fontSdf, (uint32_t) textSize);
-			metrics = TextLineMetrics(fontManager->getFontInfo(fontScaled) );
-			recomputeVisibleText = true;
-		}
-
-		recomputeVisibleText |= imguiSlider("Scroll", textScroll, 0.0f, (lineCount-visibleLineCount) , 1.0f);
-		imguiSlider("Rotate", textRotation, 0.0f, bx::kPi*2.0f , 0.1f);
-		recomputeVisibleText |= imguiSlider("Scale", textScale, 0.1f, 10.0f , 0.1f);
-
-		if (recomputeVisibleText)
-		{
-			textBufferManager->clearTextBuffer(scrollableBuffer);
-			metrics.getSubText(bigText,(uint32_t)textScroll, (uint32_t)(textScroll+visibleLineCount), textBegin, textEnd);
-			textBufferManager->appendText(scrollableBuffer, fontScaled, textBegin, textEnd);
-		}
-
-		imguiEndScrollArea();
-
-		imguiEndFrame();
-
-		// Set view 0 default viewport.
-		bgfx::setViewRect(0, 0, 0, uint16_t(width), uint16_t(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 print32_t information about this example.
-		bgfx::dbgTextClear();
-		bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/11-fontsdf");
-		bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Use a single distance field font to render text of various size.");
-		bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime) * toMs);
-
-		float at[3]  = { 0, 0, 0.0f };
-		float eye[3] = {0, 0, -1.0f };
-
-		float view[16];
-		bx::mtxLookAt(view, eye, at);
-
-		const float centering = 0.5f;
-
-		// Setup a top-left ortho matrix for screen space drawing.
-		const bgfx::HMD* hmd = bgfx::getHMD();
-		if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
-		{
-			float proj[16];
-			bx::mtxProj(proj, hmd->eye[0].fov, 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth);
-
-			static float time = 0.0f;
-			time += 0.05f;
-
-			const float dist = 10.0f;
-			const float offset0 = -proj[8] + (hmd->eye[0].viewOffset[0] / dist * proj[0]);
-			const float offset1 = -proj[8] + (hmd->eye[1].viewOffset[0] / dist * proj[0]);
+		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
+						   );
+		
+		// Imgui.
+		imguiCreate();
+		
+		m_bigText = (char*)load("text/sherlock_holmes_a_scandal_in_bohemia_arthur_conan_doyle.txt");
+		
+		// Init the text rendering system.
+		m_fontManager = new FontManager(512);
+		m_textBufferManager = new TextBufferManager(m_fontManager);
+		
+		m_font = loadTtf(m_fontManager, "font/special_elite.ttf");
+		
+		// Create a distance field font.
+		m_fontSdf = m_fontManager->createFontByPixelSize(m_font, 0, 48, FONT_TYPE_DISTANCE);
+		
+		// Create a scaled down version of the same font (without adding anything to the atlas).
+		m_fontScaled = m_fontManager->createScaledFontToPixelSize(m_fontSdf, 14);
+		
+		m_metrics = TextLineMetrics(m_fontManager->getFontInfo(m_fontScaled) );
+		m_lineCount = m_metrics.getLineCount(m_bigText);
+		
+		m_visibleLineCount = 20.0f;
+		
+		m_textBegin = 0;
+		m_textEnd = 0;
+		m_metrics.getSubText(m_bigText, 0, (uint32_t)m_visibleLineCount, m_textBegin, m_textEnd);
+		
+		m_scrollableBuffer = m_textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, BufferType::Transient);
+		m_textBufferManager->setTextColor(m_scrollableBuffer, 0xFFFFFFFF);
+		
+		m_textBufferManager->appendText(m_scrollableBuffer, m_fontScaled, m_textBegin, m_textEnd);
+		
+		m_scrollArea = 0;
+		m_textScroll = 0.0f;
+		m_textRotation = 0.0f;
+		m_textScale = 1.0f;
+		m_textSize = 14.0f;
+	}
+	
+	virtual int shutdown() BX_OVERRIDE
+	{
+		
+		imguiDestroy();
+		
+		BX_FREE(entry::getAllocator(), m_bigText);
+		
+		m_fontManager->destroyTtf(m_font);
+		// Destroy the fonts.
+		m_fontManager->destroyFont(m_fontSdf);
+		m_fontManager->destroyFont(m_fontScaled);
+		
+		m_textBufferManager->destroyTextBuffer(m_scrollableBuffer);
+		
+		delete m_textBufferManager;
+		delete m_fontManager;
+		
+		// Shutdown bgfx.
+		bgfx::shutdown();
+		
+		return 0;
+	}
 
-			float ortho[2][16];
-			const float viewOffset = width/4.0f;
-			const float viewWidth  = width/2.0f;
-			bx::mtxOrtho(ortho[0], centering + viewOffset, centering + viewOffset + viewWidth, height + centering, centering, -1.0f, 1.0f, offset0);
-			bx::mtxOrtho(ortho[1], centering + viewOffset, centering + viewOffset + viewWidth, height + centering, centering, -1.0f, 1.0f, offset1);
-			bgfx::setViewTransform(0, view, ortho[0], BGFX_VIEW_STEREO, ortho[1]);
-			bgfx::setViewRect(0, 0, 0, hmd->width, hmd->height);
-		}
-		else
+	bool update() BX_OVERRIDE
+	{
+		
+		if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState) )
 		{
-			float ortho[16];
-			bx::mtxOrtho(ortho, centering, width + centering, height + centering, centering, -1.0f, 1.0f);
-			bgfx::setViewTransform(0, view, ortho);
-			bgfx::setViewRect(0, 0, 0, uint16_t(width), uint16_t(height) );
+			imguiBeginFrame(m_mouseState.m_mx
+							, m_mouseState.m_my
+							, (m_mouseState.m_buttons[entry::MouseButton::Left  ] ? IMGUI_MBUT_LEFT   : 0)
+							| (m_mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT  : 0)
+							| (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
+							, m_mouseState.m_mz
+							, uint16_t(m_width)
+							, uint16_t(m_height)
+							);
+			
+			const int32_t guiPanelWidth = 250;
+			const int32_t guiPanelHeight = 200;
+			
+			imguiBeginScrollArea("Text Area"
+								 , m_width - guiPanelWidth - 10
+								 , 10
+								 , guiPanelWidth
+								 , guiPanelHeight
+								 , &m_scrollArea
+								 );
+			imguiSeparatorLine();
+			
+			bool recomputeVisibleText = false;
+			recomputeVisibleText |= imguiSlider("Number of lines", m_visibleLineCount, 1.0f, 177.0f , 1.0f);
+			if (imguiSlider("Font size", m_textSize, 6.0f, 64.0f , 1.0f) )
+			{
+				m_fontManager->destroyFont(m_fontScaled);
+				m_fontScaled = m_fontManager->createScaledFontToPixelSize(m_fontSdf, (uint32_t) m_textSize);
+				m_metrics = TextLineMetrics(m_fontManager->getFontInfo(m_fontScaled) );
+				recomputeVisibleText = true;
+			}
+			
+			recomputeVisibleText |= imguiSlider("Scroll", m_textScroll, 0.0f, (m_lineCount-m_visibleLineCount) , 1.0f);
+			imguiSlider("Rotate", m_textRotation, 0.0f, bx::kPi*2.0f , 0.1f);
+			recomputeVisibleText |= imguiSlider("Scale", m_textScale, 0.1f, 10.0f , 0.1f);
+			
+			if (recomputeVisibleText)
+			{
+				m_textBufferManager->clearTextBuffer(m_scrollableBuffer);
+				m_metrics.getSubText(m_bigText,(uint32_t)m_textScroll, (uint32_t)(m_textScroll+m_visibleLineCount), m_textBegin, m_textEnd);
+				m_textBufferManager->appendText(m_scrollableBuffer, m_fontScaled, m_textBegin, m_textEnd);
+			}
+			
+			imguiEndScrollArea();
+			
+			imguiEndFrame();
+			
+			// 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 print32_t information about this example.
+			bgfx::dbgTextClear();
+			bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/11-fontsdf");
+			bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Use a single distance field font to render text of various size.");
+			bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime) * toMs);
+			
+			float at[3]  = { 0, 0, 0.0f };
+			float eye[3] = {0, 0, -1.0f };
+			
+			float view[16];
+			bx::mtxLookAt(view, eye, at);
+			
+			const float centering = 0.5f;
+			
+			// Setup a top-left ortho matrix for screen space drawing.
+			const bgfx::HMD* hmd = bgfx::getHMD();
+			if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
+			{
+				float proj[16];
+				bx::mtxProj(proj, hmd->eye[0].fov, 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth);
+				
+				static float time = 0.0f;
+				time += 0.05f;
+				
+				const float dist = 10.0f;
+				const float offset0 = -proj[8] + (hmd->eye[0].viewOffset[0] / dist * proj[0]);
+				const float offset1 = -proj[8] + (hmd->eye[1].viewOffset[0] / dist * proj[0]);
+				
+				float ortho[2][16];
+				const float viewOffset = m_width/4.0f;
+				const float viewWidth  = m_width/2.0f;
+				bx::mtxOrtho(ortho[0], centering + viewOffset, centering + viewOffset + viewWidth, m_height + centering, centering, -1.0f, 1.0f, offset0);
+				bx::mtxOrtho(ortho[1], centering + viewOffset, centering + viewOffset + viewWidth, m_height + centering, centering, -1.0f, 1.0f, offset1);
+				bgfx::setViewTransform(0, view, ortho[0], BGFX_VIEW_STEREO, ortho[1]);
+				bgfx::setViewRect(0, 0, 0, hmd->width, hmd->height);
+			}
+			else
+			{
+				float ortho[16];
+				bx::mtxOrtho(ortho, centering, m_width + centering, m_height + centering, centering, -1.0f, 1.0f);
+				bgfx::setViewTransform(0, view, ortho);
+				bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );
+			}
+			
+			//very crude approximation :(
+			float textAreaWidth = 0.5f * 66.0f * m_fontManager->getFontInfo(m_fontScaled).maxAdvanceWidth;
+			
+			float textRotMat[16];
+			float textCenterMat[16];
+			float textScaleMat[16];
+			float screenCenterMat[16];
+			
+			bx::mtxRotateZ(textRotMat, m_textRotation);
+			bx::mtxTranslate(textCenterMat, -(textAreaWidth * 0.5f), (-m_visibleLineCount)*m_metrics.getLineHeight()*0.5f, 0);
+			bx::mtxScale(textScaleMat, m_textScale, m_textScale, 1.0f);
+			bx::mtxTranslate(screenCenterMat, ( (m_width) * 0.5f), ( (m_height) * 0.5f), 0);
+			
+			//first translate to text center, then scale, then rotate
+			float tmpMat[16];
+			bx::mtxMul(tmpMat, textCenterMat, textRotMat);
+			
+			float tmpMat2[16];
+			bx::mtxMul(tmpMat2, tmpMat, textScaleMat);
+			
+			float tmpMat3[16];
+			bx::mtxMul(tmpMat3, tmpMat2, screenCenterMat);
+			
+			// Set model matrix for rendering.
+			bgfx::setTransform(tmpMat3);
+			
+			// Draw your text.
+			m_textBufferManager->submitTextBuffer(m_scrollableBuffer, 0);
+			
+			// Advance to next frame. Rendering thread will be kicked to
+			// process submitted rendering primitives.
+			bgfx::frame();
+			
+			return true;
 		}
-
-		//very crude approximation :(
-		float textAreaWidth = 0.5f * 66.0f * fontManager->getFontInfo(fontScaled).maxAdvanceWidth;
-
-		float textRotMat[16];
-		float textCenterMat[16];
-		float textScaleMat[16];
-		float screenCenterMat[16];
-
-		bx::mtxRotateZ(textRotMat, textRotation);
-		bx::mtxTranslate(textCenterMat, -(textAreaWidth * 0.5f), (-visibleLineCount)*metrics.getLineHeight()*0.5f, 0);
-		bx::mtxScale(textScaleMat, textScale, textScale, 1.0f);
-		bx::mtxTranslate(screenCenterMat, ( (width) * 0.5f), ( (height) * 0.5f), 0);
-
-		//first translate to text center, then scale, then rotate
-		float tmpMat[16];
-		bx::mtxMul(tmpMat, textCenterMat, textRotMat);
-
-		float tmpMat2[16];
-		bx::mtxMul(tmpMat2, tmpMat, textScaleMat);
-
-		float tmpMat3[16];
-		bx::mtxMul(tmpMat3, tmpMat2, screenCenterMat);
-
-		// Set model matrix for rendering.
-		bgfx::setTransform(tmpMat3);
-
-		// Draw your text.
-		textBufferManager->submitTextBuffer(scrollableBuffer, 0);
-
-		// Advance to next frame. Rendering thread will be kicked to
-		// process submitted rendering primitives.
-		bgfx::frame();
+		
+		return false;
 	}
 
-	imguiDestroy();
-
-	BX_FREE(entry::getAllocator(), bigText);
-
-	fontManager->destroyTtf(font);
-	// Destroy the fonts.
-	fontManager->destroyFont(fontSdf);
-	fontManager->destroyFont(fontScaled);
-
-	textBufferManager->destroyTextBuffer(scrollableBuffer);
-
-	delete textBufferManager;
-	delete fontManager;
-
-	// Shutdown bgfx.
-	bgfx::shutdown();
-
-	return 0;
-}
+	entry::MouseState m_mouseState;
+	uint32_t m_width;
+	uint32_t m_height;
+	uint32_t m_debug;
+	uint32_t m_reset;
+	
+	char* m_bigText;
+	
+	// Init the text rendering system.
+	FontManager* m_fontManager;
+	TextBufferManager* m_textBufferManager;
+	
+	TrueTypeHandle m_font;
+	FontHandle m_fontSdf;
+	FontHandle m_fontScaled;
+	
+	TextBufferHandle m_scrollableBuffer;
+	
+	TextLineMetrics m_metrics = TextLineMetrics(FontInfo());
+	uint32_t m_lineCount;
+	float m_visibleLineCount;
+	const char* m_textBegin;
+	const char* m_textEnd;
+	
+	int32_t m_scrollArea;
+	float m_textScroll;
+	float m_textRotation;
+	float m_textScale;
+	float m_textSize;
+};
+
+ENTRY_IMPLEMENT_MAIN(ExampleFontSDF);