add some defaults to make text render setup easier

MoonWorks.csproj

@@ -33,5 +33,11 @@
 		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\video_yuv2rgba.frag.refresh">
 			<LogicalName>MoonWorks.Graphics.StockShaders.VideoYUV2RGBA.frag.refresh</LogicalName>
 		</EmbeddedResource>
+		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\text_transform.vert.refresh">
+			<LogicalName>MoonWorks.Graphics.StockShaders.TextTransform.vert.refresh</LogicalName>
+		</EmbeddedResource>
+		<EmbeddedResource Include="src\Graphics\StockShaders\Binary\text_msdf.frag.refresh">
+			<LogicalName>MoonWorks.Graphics.StockShaders.TextMSDF.frag.refresh</LogicalName>
+		</EmbeddedResource>
 	</ItemGroup>
 </Project>

src/Graphics/Font/Structs.cs

@@ -4,10 +4,17 @@ using MoonWorks.Math.Float;
 namespace MoonWorks.Graphics.Font
 {
 	[StructLayout(LayoutKind.Sequential)]
-	public struct Vertex
+	public struct Vertex : IVertexType
 	{
 		public Vector3 Position;
 		public Vector2 TexCoord;
 		public Color Color;
+
+		public static VertexElementFormat[] Formats { get; } = new VertexElementFormat[]
+		{
+			VertexElementFormat.Vector3,
+			VertexElementFormat.Vector2,
+			VertexElementFormat.Color
+		};
 	}
 }

src/Graphics/Font/TextBatch.cs

@@ -100,6 +100,24 @@ namespace MoonWorks.Graphics.Font
 			PrimitiveCount = vertexCount / 2; // FIXME: is this jank?
 		}
 
+		// Call this AFTER binding your text pipeline!
+		public void Render(CommandBuffer commandBuffer, Math.Float.Matrix4x4 transformMatrix)
+		{
+			commandBuffer.BindFragmentSamplers(new TextureSamplerBinding(
+				CurrentFont.Texture,
+				GraphicsDevice.LinearSampler
+			));
+			commandBuffer.BindVertexBuffers(VertexBuffer);
+			commandBuffer.BindIndexBuffer(IndexBuffer, IndexElementSize.ThirtyTwo);
+			commandBuffer.DrawIndexedPrimitives(
+				0,
+				0,
+				PrimitiveCount,
+				commandBuffer.PushVertexShaderUniforms(transformMatrix),
+				commandBuffer.PushFragmentShaderUniforms(CurrentFont.DistanceRange)
+			);
+		}
+
 		protected override void Dispose(bool disposing)
 		{
 			if (!IsDisposed)

src/Graphics/GraphicsDevice.cs

@@ -4,6 +4,7 @@ using System.IO;
 using System.Runtime.InteropServices;
 using MoonWorks.Video;
 using RefreshCS;
+using WellspringCS;
 
 namespace MoonWorks.Graphics
 {
@@ -21,6 +22,15 @@ namespace MoonWorks.Graphics
 		// Built-in video pipeline
 		internal GraphicsPipeline VideoPipeline { get; }
 
+		// Built-in text shader info
+		public GraphicsShaderInfo TextVertexShaderInfo { get; }
+		public GraphicsShaderInfo TextFragmentShaderInfo { get; }
+		public VertexInputState TextVertexInputState { get; }
+
+		// Built-in samplers
+		public Sampler PointSampler { get; }
+		public Sampler LinearSampler { get; }
+
 		public bool IsDisposed { get; private set; }
 
 		private readonly HashSet<GCHandle> resources = new HashSet<GCHandle>();
@@ -41,14 +51,23 @@ namespace MoonWorks.Graphics
 				Conversions.BoolToByte(debugMode)
 			);
 
-			// Check for optional video shaders
+			// TODO: check for CreateDevice fail
+
+			// Check for replacement stock shaders
 			string basePath = System.AppContext.BaseDirectory;
+
 			string videoVertPath = Path.Combine(basePath, "video_fullscreen.vert.refresh");
 			string videoFragPath = Path.Combine(basePath, "video_yuv2rgba.frag.refresh");
 
+			string textVertPath = Path.Combine(basePath, "text_transform.vert.refresh");
+			string textFragPath = Path.Combine(basePath, "text_msdf.frag.refresh");
+
 			ShaderModule videoVertShader;
 			ShaderModule videoFragShader;
 
+			ShaderModule textVertShader;
+			ShaderModule textFragShader;
+
 			if (File.Exists(videoVertPath) && File.Exists(videoFragPath))
 			{
 				videoVertShader = new ShaderModule(this, videoVertPath);
@@ -66,6 +85,23 @@ namespace MoonWorks.Graphics
 				videoFragShader = new ShaderModule(this, fragStream);
 			}
 
+			if (File.Exists(textVertPath) && File.Exists(textFragPath))
+			{
+				textVertShader = new ShaderModule(this, textVertPath);
+				textFragShader = new ShaderModule(this, textFragPath);
+			}
+			else
+			{
+				// use defaults
+				var assembly = typeof(GraphicsDevice).Assembly;
+
+				using var vertStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.TextTransform.vert.refresh");
+				using var fragStream = assembly.GetManifestResourceStream("MoonWorks.Graphics.StockShaders.TextMSDF.frag.refresh");
+
+				textVertShader = new ShaderModule(this, vertStream);
+				textFragShader = new ShaderModule(this, fragStream);
+			}
+
 			VideoPipeline = new GraphicsPipeline(
 				this,
 				new GraphicsPipelineCreateInfo
@@ -94,6 +130,13 @@ namespace MoonWorks.Graphics
 				}
 			);
 
+			TextVertexShaderInfo = GraphicsShaderInfo.Create<Math.Float.Matrix4x4>(textVertShader, "main", 0);
+			TextFragmentShaderInfo = GraphicsShaderInfo.Create<float>(textFragShader, "main", 1);
+			TextVertexInputState = VertexInputState.CreateSingleBinding<Font.Vertex>();
+
+			PointSampler = new Sampler(this, SamplerCreateInfo.PointClamp);
+			LinearSampler = new Sampler(this, SamplerCreateInfo.LinearClamp);
+
 			FencePool = new FencePool(this);
 		}
 

src/Graphics/StockShaders/Source/text_msdf.frag

@@ -0,0 +1,34 @@
+#version 450
+
+layout(set = 1, binding = 0) uniform sampler2D msdf;
+
+layout(location = 0) in vec2 inTexCoord;
+layout(location = 1) in vec4 inColor;
+
+layout(location = 0) out vec4 outColor;
+
+layout(binding = 0, set = 3) uniform UBO
+{
+	float pxRange;
+} ubo;
+
+float median(float r, float g, float b)
+{
+	return max(min(r, g), min(max(r, g), b));
+}
+
+float screenPxRange()
+{
+    vec2 unitRange = vec2(ubo.pxRange)/vec2(textureSize(msdf, 0));
+    vec2 screenTexSize = vec2(1.0)/fwidth(inTexCoord);
+    return max(0.5*dot(unitRange, screenTexSize), 1.0);
+}
+
+void main()
+{
+	vec3 msd = texture(msdf, inTexCoord).rgb;
+	float sd = median(msd.r, msd.g, msd.b);
+    float screenPxDistance = screenPxRange() * (sd - 0.5);
+    float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
+    outColor = mix(vec4(0.0, 0.0, 0.0, 0.0), inColor, opacity);
+}

src/Graphics/StockShaders/Source/text_transform.vert

@@ -0,0 +1,20 @@
+#version 450
+
+layout(location = 0) in vec3 inPos;
+layout(location = 1) in vec2 inTexCoord;
+layout(location = 2) in vec4 inColor;
+
+layout(location = 0) out vec2 outTexCoord;
+layout(location = 1) out vec4 outColor;
+
+layout(binding = 0, set = 2) uniform UBO
+{
+	mat4 ViewProjection;
+} ubo;
+
+void main()
+{
+	gl_Position = ubo.ViewProjection * vec4(inPos, 1.0);
+	outTexCoord = inTexCoord;
+	outColor = inColor;
+}

src/Video/VideoPlayer.cs

@@ -37,10 +37,6 @@ namespace MoonWorks.Video
 		public VideoPlayer(GraphicsDevice device) : base(device)
 		{
 			GraphicsDevice = device;
-			if (GraphicsDevice.VideoPipeline == null)
-			{
-				throw new InvalidOperationException("Missing video shaders!");
-			}
 
 			LinearSampler = new Sampler(device, SamplerCreateInfo.LinearClamp);