Added android support for distance field fonts example (#97) Fixes (#109)

android/distancefieldfonts/.gitignore

@@ -0,0 +1,10 @@
+/assets/
+/res/
+/bin/
+/libs/
+/obj/
+/build.xml
+/local.properties
+/project.properties
+/proguard-project.txt
+*.apk

android/distancefieldfonts/AndroidManifest.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+		package="de.saschawillems.vulkanDistancefieldfonts"
+        android:versionCode="1"
+        android:versionName="1.0">
+
+    <uses-sdk android:minSdkVersion="19" />
+
+    <uses-feature android:name="android.hardware.touchscreen" android:required="false"/>
+    <uses-feature android:name="android.hardware.gamepad" android:required="false"/>
+    <uses-feature android:name="android.software.leanback" android:required="false"/>
+
+    <application android:label="vulkanDistancefieldfonts" android:icon="@drawable/icon" android:hasCode="false">
+		<activity android:name="android.app.NativeActivity"
+                android:label="Distance Field Fonts"
+                android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+				android:launchMode="singleTask"
+                android:configChanges="orientation|screenSize|keyboardHidden">
+			<meta-data android:name="android.app.lib_name" android:value="vulkanDistancefieldfonts" />
+			<intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+				<category android:name="android.intent.category.LEANBACK_LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

android/distancefieldfonts/build.bat

@@ -0,0 +1,23 @@
+cd jni
+call ndk-build
+if %ERRORLEVEL% EQU 0 (
+	echo ndk-build has failed, build cancelled
+	cd..
+
+	mkdir "assets\shaders\distancefieldfonts"
+	xcopy "..\..\data\shaders\distancefieldfonts\*.spv" "assets\shaders\distancefieldfonts" /Y
+
+	mkdir "assets\textures"
+	xcopy "..\..\data\textures\font_sdf_rgba.ktx" "assets\textures" /Y
+	xcopy "..\..\data\textures\font_bitmap_rgba.ktx" "assets\textures" /Y
+
+	xcopy "..\..\data\font.fnt" "assets" /Y
+	
+	mkdir "res\drawable"
+	xcopy "..\..\android\images\icon.png" "res\drawable" /Y
+
+	call ant debug -Dout.final.file=vulkanDistancefieldfonts.apk
+) ELSE (
+	echo error : ndk-build failed with errors!
+	cd..
+)

android/distancefieldfonts/jni/Android.mk

@@ -0,0 +1,50 @@
+LOCAL_PATH := $(call my-dir)/../../distancefieldfonts
+
+# assimp
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := assimp
+LOCAL_SRC_FILES := $(LOCAL_PATH)/../../libs/assimp/$(TARGET_ARCH_ABI)/libassimp.a
+include $(PREBUILT_STATIC_LIBRARY)
+
+# vulkan example
+
+DATADIR := $(LOCAL_PATH)/../../data
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := vulkanDistancefieldfonts
+
+PROJECT_FILES := $(wildcard $(LOCAL_PATH)/../../distancefieldfonts/*.cpp)
+PROJECT_FILES += $(wildcard $(LOCAL_PATH)/../../base/*.cpp)
+
+# stringstream usage causes some warnings that would fail the build  
+LOCAL_DISABLE_FATAL_LINKER_WARNINGS := true
+
+LOCAL_CPPFLAGS := -std=c++11
+LOCAL_CPPFLAGS += -D__STDC_LIMIT_MACROS
+LOCAL_CPPFLAGS += -DVK_NO_PROTOTYPES
+LOCAL_CPPFLAGS += -DVK_USE_PLATFORM_ANDROID_KHR
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../external/
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../external/glm
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../external/gli
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../external/assimp
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../base/
+#LOCAL_C_INCLUDES += $(LOCAL_PATH)/../../base/android
+
+LOCAL_SRC_FILES := $(PROJECT_FILES)
+
+LOCAL_LDLIBS := -landroid -llog -lz
+
+LOCAL_DISABLE_FORMAT_STRING_CHECKS := true
+
+LOCAL_STATIC_LIBRARIES += android_native_app_glue
+LOCAL_STATIC_LIBRARIES += cpufeatures
+LOCAL_STATIC_LIBRARIES += libassimp
+
+include $(BUILD_SHARED_LIBRARY)
+
+$(call import-module, android/native_app_glue)
+$(call import-module, android/cpufeatures)

android/distancefieldfonts/jni/Application.mk

@@ -0,0 +1,5 @@
+APP_PLATFORM := android-19
+APP_ABI := armeabi-v7a
+APP_STL := c++_static
+APP_CPPFLAGS := -std=c++11
+NDK_TOOLCHAIN_VERSION := clang

distancefieldfonts/distancefieldfonts.cpp

@@ -58,43 +58,6 @@ int32_t nextValuePair(std::stringstream *stream)
 	return val;
 }
 
-void parsebmFont()
-{
-	const char *filename = "../data/font.fnt";
-
-	std::ifstream fstream(filename);
-	assert(fstream.good());
-
-	while (!fstream.eof())
-	{
-		std::string line;
-		std::stringstream lineStream;
-		std::getline(fstream, line);
-		lineStream << line;
-
-		std::string info;
-		lineStream >> info;
-
-		if (info == "char")
-		{
-			std::string pair;
-
-			// char id
-			uint32_t charid = nextValuePair(&lineStream);
-			// Char properties
-			fontChars[charid].x = nextValuePair(&lineStream);
-			fontChars[charid].y = nextValuePair(&lineStream);
-			fontChars[charid].width = nextValuePair(&lineStream);
-			fontChars[charid].height = nextValuePair(&lineStream);
-			fontChars[charid].xoffset = nextValuePair(&lineStream);
-			fontChars[charid].yoffset = nextValuePair(&lineStream);
-			fontChars[charid].xadvance = nextValuePair(&lineStream);
-			fontChars[charid].page = nextValuePair(&lineStream);
-		}
-	}
-
-}
-
 class VulkanExample : public VulkanExampleBase
 {
 public:
@@ -179,14 +142,73 @@ public:
 		vkFreeMemory(device, uniformData.vs.memory, nullptr);
 	}
 
+	// Basic parser fpr AngelCode bitmap font format files
+	// See http://www.angelcode.com/products/bmfont/doc/file_format.html for details
+	void parsebmFont()
+	{
+		std::string fileName = getAssetPath() + "font.fnt";
+
+#if defined(__ANDROID__)
+		// Font description file is stored inside the apk
+		// So we need to load it using the asset manager
+		AAsset* asset = AAssetManager_open(androidApp->activity->assetManager, fileName.c_str(), AASSET_MODE_STREAMING);
+		assert(asset);
+		size_t size = AAsset_getLength(asset);
+
+		assert(size > 0);
+
+		void *fileData = malloc(size);
+		AAsset_read(asset, fileData, size);
+		AAsset_close(asset);
+
+		std::stringbuf sbuf((const char*)fileData);
+		std::istream istream(&sbuf);
+#else
+		FILE *file = fopen(fileName.c_str(), "r");
+		std::filebuf fileBuffer(file);
+		std::istream istream(&fileBuffer);
+#endif
+
+		assert(istream.good());
+
+		while (!istream.eof())
+		{
+			std::string line;
+			std::stringstream lineStream;
+			std::getline(istream, line);
+			lineStream << line;
+
+			std::string info;
+			lineStream >> info;
+
+			if (info == "char")
+			{
+				std::string pair;
+
+				// char id
+				uint32_t charid = nextValuePair(&lineStream);
+				// Char properties
+				fontChars[charid].x = nextValuePair(&lineStream);
+				fontChars[charid].y = nextValuePair(&lineStream);
+				fontChars[charid].width = nextValuePair(&lineStream);
+				fontChars[charid].height = nextValuePair(&lineStream);
+				fontChars[charid].xoffset = nextValuePair(&lineStream);
+				fontChars[charid].yoffset = nextValuePair(&lineStream);
+				fontChars[charid].xadvance = nextValuePair(&lineStream);
+				fontChars[charid].page = nextValuePair(&lineStream);
+			}
+		}
+
+	}
+
 	void loadTextures()
 	{
 		textureLoader->loadTexture(
-			"./../data/textures/font_sdf_rgba.ktx",
+			getAssetPath() + "textures/font_sdf_rgba.ktx",
 			VK_FORMAT_R8G8B8A8_UNORM,
 			&textures.fontSDF);
 		textureLoader->loadTexture(
-			"./../data/textures/font_bitmap_rgba.ktx",
+			getAssetPath() + "textures/font_bitmap_rgba.ktx",
 			VK_FORMAT_R8G8B8A8_UNORM,
 			&textures.fontBitmap);
 	}
@@ -207,7 +229,6 @@ public:
 
 		VkClearValue clearValues[2];
 		clearValues[0].color = defaultClearColor;
-		clearValues[0].color = { {0.0f, 0.0f, 0.2f, 0.0f} };
 		clearValues[1].depthStencil = { 1.0f, 0 };
 
 		VkRenderPassBeginInfo renderPassBeginInfo = vkTools::initializers::renderPassBeginInfo();
@@ -555,13 +576,14 @@ public:
 				0xf,
 				VK_TRUE);
 
+		blendAttachmentState.blendEnable = VK_TRUE;
+		blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+		blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
 		blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
-		blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_SRC_COLOR;
-		blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR;
+		blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
+		blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
 		blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
-		blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_SRC_ALPHA;
-		blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
-		blendAttachmentState.blendEnable = VK_FALSE;
+		blendAttachmentState.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
 
 		VkPipelineColorBlendStateCreateInfo colorBlendState =
 			vkTools::initializers::pipelineColorBlendStateCreateInfo(
@@ -595,8 +617,8 @@ public:
 		// Load shaders
 		std::array<VkPipelineShaderStageCreateInfo,2> shaderStages;
 
-		shaderStages[0] = loadShader("./../data/shaders/distancefieldfonts/sdf.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
-		shaderStages[1] = loadShader("./../data/shaders/distancefieldfonts/sdf.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
+		shaderStages[0] = loadShader(getAssetPath() + "shaders/distancefieldfonts/sdf.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
+		shaderStages[1] = loadShader(getAssetPath() + "shaders/distancefieldfonts/sdf.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
 
 		VkGraphicsPipelineCreateInfo pipelineCreateInfo =
 			vkTools::initializers::pipelineCreateInfo(
@@ -619,8 +641,8 @@ public:
 		assert(!err);
 
 		// Default bitmap font rendering pipeline
-		shaderStages[0] = loadShader("./../data/shaders/distancefieldfonts/bitmap.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
-		shaderStages[1] = loadShader("./../data/shaders/distancefieldfonts/bitmap.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
+		shaderStages[0] = loadShader(getAssetPath() + "shaders/distancefieldfonts/bitmap.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
+		shaderStages[1] = loadShader(getAssetPath() + "shaders/distancefieldfonts/bitmap.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
 		err = vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.bitmap);
 		assert(!err);
 	}
@@ -728,8 +750,7 @@ public:
 
 VulkanExample *vulkanExample;
 
-#ifdef _WIN32
-
+#if defined(_WIN32)
 LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
 	if (vulkanExample != NULL)
@@ -750,9 +771,7 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 	}
 	return (DefWindowProc(hWnd, uMsg, wParam, lParam));
 }
-
-#else 
-
+#elif defined(__linux__) && !defined(__ANDROID__)
 static void handleEvent(const xcb_generic_event_t *event)
 {
 	if (vulkanExample != NULL)
@@ -762,21 +781,42 @@ static void handleEvent(const xcb_generic_event_t *event)
 }
 #endif
 
-#ifdef _WIN32
+// Main entry point
+#if defined(_WIN32)
+// Windows entry point
 int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR pCmdLine, int nCmdShow)
-#else
+#elif defined(__ANDROID__)
+// Android entry point
+void android_main(android_app* state)
+#elif defined(__linux__)
+// Linux entry point
 int main(const int argc, const char *argv[])
 #endif
 {
+#if defined(__ANDROID__)
+	// Removing this may cause the compiler to omit the main entry point 
+	// which would make the application crash at start
+	app_dummy();
+#endif
 	vulkanExample = new VulkanExample();
-#ifdef _WIN32
+#if defined(_WIN32)
 	vulkanExample->setupWindow(hInstance, WndProc);
-#else
+#elif defined(__ANDROID__)
+	// Attach vulkan example to global android application state
+	state->userData = vulkanExample;
+	state->onAppCmd = VulkanExample::handleAppCommand;
+	state->onInputEvent = VulkanExample::handleAppInput;
+	vulkanExample->androidApp = state;
+#elif defined(__linux__)
 	vulkanExample->setupWindow();
 #endif
+#if !defined(__ANDROID__)
 	vulkanExample->initSwapchain();
 	vulkanExample->prepare();
+#endif
 	vulkanExample->renderLoop();
+#if !defined(__ANDROID__)
 	delete(vulkanExample);
 	return 0;
+#endif
 }