Font fixes

README.md

@@ -318,3 +318,6 @@ If `SLANG_ROOT` or `MSDF_ATLAS_GEN_ROOT` is not set, the workflow falls back to
 - Anotate included shaders
 - allow 3 vector exposed controls
 - add nearest sampling to the extra shader pass
+- add spout input/output (https://github.com/leadedge/Spout2)
+- Add Aja input and output (Assuming i can get a hold of an aja card)
+- Add bluefish input and output (Assuming again card acess)

config/runtime-host.json

@@ -6,14 +6,14 @@
   "oscPort": 9000,
   "oscSmoothing": 0.18,
   "input": {
-    "backend": "none",
+    "backend": "ndi",
-    "device": "AIDENLAPTOP (NVIDIA GeForce RTX 4090 Laptop GPU 1)",
+    "device": "AIDENLAPTOP (Test Pattern)",
     "resolution": "1080p",
     "frameRate": "59.94"
   },
   "output": {
-    "backend": "ndi",
+    "backend": "decklink",
-    "device": "shader toys",
+    "device": "default",
     "resolution": "1080p",
     "frameRate": "59.94",
     "keying": {

docs/openapi.yaml

@@ -1079,6 +1079,9 @@ components:
         font:
           type: string
           description: Font asset id used by text parameters, when declared.
+        fontParameter:
+          type: string
+          description: Enum parameter id used to select a text parameter font at runtime.
         value:
           description: Current parameter value.
           oneOf:

shaders/SHADER_CONTRACT.md

@@ -592,6 +592,40 @@ float4 premultipliedText = drawTitleText(textUv, float4(1.0, 1.0, 1.0, 1.0));
 
 Text is currently limited to printable ASCII. `maxLength` defaults to `64` and is clamped to `1..256`. The optional `font` field references a packaged font declared in `fonts`; if no font is specified, the runtime uses its fallback sans-serif renderer.
 
+Text parameters can also choose their font from an enum parameter by setting `fontParameter` to that enum parameter's `id`:
+
+```json
+{
+  "fonts": [
+    { "id": "inter", "path": "fonts/Inter-Regular.ttf" },
+    { "id": "mono", "path": "fonts/Mono-Regular.ttf" }
+  ],
+  "parameters": [
+    {
+      "id": "font",
+      "label": "Font",
+      "type": "enum",
+      "default": "inter",
+      "options": [
+        { "value": "inter", "label": "Inter" },
+        { "value": "mono", "label": "Mono" }
+      ]
+    },
+    {
+      "id": "titleText",
+      "label": "Title",
+      "type": "text",
+      "default": "LIVE",
+      "font": "inter",
+      "fontParameter": "font",
+      "maxLength": 64
+    }
+  ]
+}
+```
+
+Every option `value` in the font selector enum must match a declared font asset `id`. The `font` field remains useful as the default/fallback font for the text parameter, while `fontParameter` lets operators switch atlases at runtime without adding shader-specific code.
+
 Trigger example:
 
 ```json
@@ -619,6 +653,7 @@ Parameter validation:
 - `color` must have exactly 4 numbers.
 - Enum defaults must match one of the declared option values.
 - Text defaults must be strings. Non-printable characters are dropped and values are clamped to `maxLength`.
+- Text `fontParameter` values must reference an enum parameter whose option values are declared font asset IDs.
 - Trigger values are incremented by the host when triggered. The shader sees the trigger count and last trigger time.
 - Non-finite numeric values are rejected.
 
@@ -800,6 +835,7 @@ For multipass shaders, these files reflect the most recently compiled pass. If a
 - Remember enum globals are integer indexes, not strings.
 - Declare every texture in `shader.json`; undeclared texture samplers will not be bound.
 - Declare packaged fonts in `shader.json` when text parameters should use a specific font.
+- For selectable fonts, use a text parameter `fontParameter` that points at an enum whose option values are font IDs.
 - Keep temporal history requests modest. They consume texture units and memory and are capped by runtime config.
 - If a parameter appears in the UI but not in Slang, the shader may still compile, but the control has no effect.
 - If a Slang name collides with a generated global, rename your parameter or local symbol.
@@ -815,5 +851,6 @@ Before committing a new shader package:
 - Texture files referenced by `textures` exist.
 - Font files referenced by `fonts` exist.
 - Enum defaults are present in their `options`.
+- Text `fontParameter` selectors reference valid font assets through their enum options.
 - Temporal shaders handle short or empty history gracefully.
 - The app can reload and compile the shader without errors.

shaders/text-overlay/fonts/LICENSE.txt

@@ -0,0 +1,60 @@
+Analog Mono Plus Pixel Font - License Agreement
+Copyright © Andrew Gleeson, 2026
+heygleeson@gmail.com
+
+1. GRANT OF LICENSE
+
+This Agreement is a license, not an agreement of sale. Licensee shall
+not acquire any copyright ownership or equivalent rights to any of the
+Licensed Content. Seller and the Licensed Content sources retain all
+right, title and interest in and to all of the copyrights, trademarks,
+and all other proprietary rights in the Licensed Content. All rights
+in and to Licensed Content not expressly granted in this agreement are
+retained by Seller or its suppliers.
+
+Licensee is permitted to use the Licensed Content in unlimited
+commercial projects. A commercial project is one defined as a Work for
+Distribution launched with the capability to generate revenue, or
+intention to generate revenue through the sale of, licensing of, or
+otherwise intend to generate revenue directly from the Work for
+Distribution.
+
+2. RESTRICTION ON USE
+
+Licensed Content may not be used contrary to any restriction on use
+indicated herein.
+
+Licensed Content may not be resold, sublicensed, assigned, transferred
+or otherwise made available to third parties except as incorporated
+into Works for Distribution.
+
+Licensed Content may not be distributed to third parties as standalone
+files or in a way that unreasonably permits the recipient to extract
+the Licensed Content for use separately and apart from the Work for
+Distribution.
+
+Licensee may not distribute the Licensed Content in any library or
+reusable template, including but not limited to game templates, website
+templates intended to allow reproduction by third parties on electronic
+or printed products.
+
+Licensee may not distribute Licensed Content in a manner meant to enable
+third parties to create derivative works incorporating Licensed Content.
+
+Licensee may not superficially modify the Licensed Content and sell it
+to others for consumption, reproduction or re-sale.
+
+Licensee shall not use the Licensed Content in a manner that violates
+the law of any applicable jurisdiction.
+
+Licensee shall not claim copyright or attribution of Licensed Content.
+
+3. TERM AND TERMINATION
+
+The license contained in this Agreement terminates automatically without
+notice from Seller if Licensee fails to comply with any provision of
+this Agreement. Upon termination, Licensee must with immediate effect
+stop using the Licensed Content, destroy, delete and remove the Licensed
+Content from Licensee’s premises, computer systems and storage. Licensee
+must also make all reasonable efforts to ensure that copies of the
+licensed content are removed from any locations it has been distributed to.

shaders/text-overlay/shader.json

@@ -8,15 +8,37 @@
     {
       "id": "roboto",
       "path": "fonts/Roboto-Regular.ttf"
+    },
+    {
+      "id": "analogMono",
+      "path": "fonts/AnalogMono.ttf"
     }
   ],
   "parameters": [
+    {
+      "id": "font",
+      "label": "Font",
+      "type": "enum",
+      "default": "roboto",
+      "options": [
+        {
+          "value": "roboto",
+          "label": "Roboto"
+        },
+        {
+          "value": "analogMono",
+          "label": "Analog Mono"
+        }
+      ],
+      "description": "Font atlas used by the text overlay."
+    },
     {
       "id": "titleText",
       "label": "Text",
       "type": "text",
       "default": "VIDEO SHADER",
       "font": "roboto",
+      "fontParameter": "font",
       "maxLength": 64,
       "description": "Text string rendered into the SDF text texture."
     },

shaders/text-overlay/shader.slang

@@ -38,12 +38,14 @@ float4 shadeVideo(ShaderContext context)
 	float2 pixelTextUv = (1.0 / resolution) / safeTextSize;
 	float2 sampleOffset = pixelTextUv * 0.38;
 	float msdfDistance = sampleTitleTextMsdf(textUv);
-	float fill = (
+	float msdfFill = (
 		coverage(msdfDistance, edge, aa) * 2.0 +
 		coverage(sampleTitleTextMsdf(textUv + float2(sampleOffset.x, sampleOffset.y)), edge, aa) +
 		coverage(sampleTitleTextMsdf(textUv + float2(-sampleOffset.x, sampleOffset.y)), edge, aa) +
 		coverage(sampleTitleTextMsdf(textUv + float2(sampleOffset.x, -sampleOffset.y)), edge, aa) +
 		coverage(sampleTitleTextMsdf(textUv + float2(-sampleOffset.x, -sampleOffset.y)), edge, aa)) / 6.0;
+	float sdfFill = coverage(distance, edge, aa);
+	float fill = min(msdfFill, sdfFill);
 	float outlineEdge = edge - min(outlineWidth * 0.7, 0.48);
 	float outline = coverage(distance, outlineEdge, aa);
 	float outlineAlpha = saturate(outline - fill) * outlineColor.a;

src/control/RuntimeStateJson.h

@@ -236,6 +236,8 @@ inline void WriteParameterDefinitionJson(JsonWriter& writer, const ShaderParamet
 		writer.KeyUInt("maxLength", parameter.maxLength);
 		if (!parameter.fontId.empty())
 			writer.KeyString("font", parameter.fontId);
+		if (!parameter.fontParameterId.empty())
+			writer.KeyString("fontParameter", parameter.fontParameterId);
 	}
 	writer.EndObject();
 }

src/render/runtime/RuntimeTextTextureCache.cpp

@@ -103,8 +103,14 @@ bool RuntimeTextTextureCache::EnsureTextTexture(TextTexture& texture)
 	const RuntimePreparedTextTexture* prepared = FindPreparedTexture(texture.parameterId);
 	if (!prepared || !prepared->rgbaPixels || prepared->rgbaPixels->empty() || prepared->width == 0 || prepared->height == 0)
 		return false;
-	if (texture.texture != 0 && texture.cachedText == prepared->textValue && texture.width == prepared->width && texture.height == prepared->height)
+	if (texture.texture != 0 &&
+		texture.cachedText == prepared->textValue &&
+		texture.cachedPixels == prepared->rgbaPixels &&
+		texture.width == prepared->width &&
+		texture.height == prepared->height)
+	{
 		return true;
+	}
 
 	if (texture.texture == 0)
 		glGenTextures(1, &texture.texture);
@@ -130,6 +136,7 @@ bool RuntimeTextTextureCache::EnsureTextTexture(TextTexture& texture)
 	glActiveTexture(GL_TEXTURE0);
 
 	texture.cachedText = prepared->textValue;
+	texture.cachedPixels = prepared->rgbaPixels;
 	texture.width = prepared->width;
 	texture.height = prepared->height;
 	texture.liveWidth = prepared->liveWidth;
@@ -154,4 +161,5 @@ void RuntimeTextTextureCache::DestroyTexture(TextTexture& texture)
 	texture.width = 0;
 	texture.height = 0;
 	texture.cachedText.clear();
+	texture.cachedPixels.reset();
 }

src/render/runtime/RuntimeTextTextureCache.h

@@ -4,6 +4,7 @@
 #include "RuntimeShaderArtifact.h"
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -28,6 +29,7 @@ private:
 	{
 		std::string parameterId;
 		std::string cachedText;
+		std::shared_ptr<const std::vector<unsigned char>> cachedPixels;
 		GLuint texture = 0;
 		unsigned width = 0;
 		unsigned height = 0;

src/runtime/catalog/SupportedShaderCatalog.cpp

@@ -8,6 +8,29 @@
 
 namespace RenderCadenceCompositor
 {
+namespace
+{
+const ShaderParameterDefinition* FindParameterDefinition(const ShaderPackage& shaderPackage, const std::string& parameterId)
+{
+	for (const ShaderParameterDefinition& parameter : shaderPackage.parameters)
+	{
+		if (parameter.id == parameterId)
+			return &parameter;
+	}
+	return nullptr;
+}
+
+bool HasFontAsset(const ShaderPackage& shaderPackage, const std::string& fontId)
+{
+	for (const ShaderFontAsset& fontAsset : shaderPackage.fontAssets)
+	{
+		if (fontAsset.id == fontId)
+			return true;
+	}
+	return false;
+}
+}
+
 ShaderSupportResult CheckStatelessSinglePassShaderSupport(const ShaderPackage& shaderPackage)
 {
 	if (shaderPackage.passes.empty())
@@ -27,20 +50,24 @@ ShaderSupportResult CheckStatelessSinglePassShaderSupport(const ShaderPackage& s
 		if (parameter.type != ShaderParameterType::Text)
 			continue;
 
-		if (parameter.fontId.empty())
+		if (parameter.fontId.empty() && parameter.fontParameterId.empty())
 			return { false, "Text parameter '" + parameter.id + "' must reference a declared font asset." };
 
-		bool hasFontAsset = false;
+		if (!parameter.fontId.empty() && !HasFontAsset(shaderPackage, parameter.fontId))
-		for (const ShaderFontAsset& fontAsset : shaderPackage.fontAssets)
-		{
-			if (fontAsset.id == parameter.fontId)
-			{
-				hasFontAsset = true;
-				break;
-			}
-		}
-		if (!hasFontAsset)
 			return { false, "Text parameter '" + parameter.id + "' references unknown font asset '" + parameter.fontId + "'." };
+
+		if (!parameter.fontParameterId.empty())
+		{
+			const ShaderParameterDefinition* fontParameter = FindParameterDefinition(shaderPackage, parameter.fontParameterId);
+			if (fontParameter == nullptr || fontParameter->type != ShaderParameterType::Enum)
+				return { false, "Text parameter '" + parameter.id + "' references unknown font enum parameter '" + parameter.fontParameterId + "'." };
+
+			for (const ShaderParameterOption& option : fontParameter->enumOptions)
+			{
+				if (!HasFontAsset(shaderPackage, option.value))
+					return { false, "Font enum parameter '" + fontParameter->id + "' references unknown font asset '" + option.value + "'." };
+			}
+		}
 	}
 
 	bool writesLayerOutput = false;
@@ -102,6 +129,7 @@ std::string ShaderPackageFingerprint(const ShaderPackage& shaderPackage)
 	{
 		source << "param:" << parameter.id << ":" << static_cast<int>(parameter.type) << ":"
 			<< parameter.label << ":" << parameter.description << ":" << parameter.fontId << ":"
+			<< parameter.fontParameterId << ":"
 			<< parameter.defaultTextValue << ":" << parameter.defaultBoolean << ":"
 			<< parameter.defaultEnumValue << ":" << parameter.maxLength << "\n";
 		for (double value : parameter.defaultNumbers)

src/runtime/layers/RuntimeLayerModel.cpp

@@ -178,7 +178,17 @@ bool RuntimeLayerModel::UpdateParameter(const std::string& layerId, const std::s
 	if (layer->renderReady)
 	{
 		layer->artifact.parameterValues = layer->parameterValues;
-		if (definition->type == ShaderParameterType::Text && !PrepareRuntimeTextTextures(layer->artifact, error))
+		bool textTexturesDependOnParameter = false;
+		for (const ShaderParameterDefinition& textDefinition : layer->parameterDefinitions)
+		{
+			if (textDefinition.type == ShaderParameterType::Text &&
+				(textDefinition.id == parameterId || textDefinition.fontParameterId == parameterId))
+			{
+				textTexturesDependOnParameter = true;
+				break;
+			}
+		}
+		if (textTexturesDependOnParameter && !PrepareRuntimeTextTextures(layer->artifact, error))
 			return false;
 	}
 	error.clear();

src/runtime/text/RuntimeTextTextureComposer.cpp

@@ -27,12 +27,38 @@ const ShaderParameterValue* FindParameterValue(const RuntimeShaderArtifact& arti
 	return valueIt == artifact.parameterValues.end() ? nullptr : &valueIt->second;
 }
 
+const ShaderParameterDefinition* FindParameterDefinition(const RuntimeShaderArtifact& artifact, const std::string& parameterId)
+{
+	for (const ShaderParameterDefinition& definition : artifact.parameterDefinitions)
+	{
+		if (definition.id == parameterId)
+			return &definition;
+	}
+	return nullptr;
+}
+
 std::string TextValueForDefinition(const RuntimeShaderArtifact& artifact, const ShaderParameterDefinition& definition)
 {
 	const ShaderParameterValue* value = FindParameterValue(artifact, definition.id);
 	return value ? value->textValue : definition.defaultTextValue;
 }
 
+std::string FontIdForTextDefinition(const RuntimeShaderArtifact& artifact, const ShaderParameterDefinition& definition)
+{
+	if (definition.fontParameterId.empty())
+		return definition.fontId;
+
+	const ShaderParameterValue* fontValue = FindParameterValue(artifact, definition.fontParameterId);
+	if (fontValue != nullptr && !fontValue->enumValue.empty())
+		return fontValue->enumValue;
+
+	const ShaderParameterDefinition* fontDefinition = FindParameterDefinition(artifact, definition.fontParameterId);
+	if (fontDefinition != nullptr && !fontDefinition->defaultEnumValue.empty())
+		return fontDefinition->defaultEnumValue;
+
+	return definition.fontId;
+}
+
 void SampleAtlasPixel(const FontAtlasBuildOutput& atlas, double x, double y, unsigned char* rgba)
 {
 	const double clampedX = (std::max)(0.0, (std::min)(static_cast<double>(atlas.width) - 1.0, x));
@@ -57,6 +83,13 @@ void SampleAtlasPixel(const FontAtlasBuildOutput& atlas, double x, double y, uns
 	}
 }
 
+double GlyphAtlasCoordinate(double minBound, double maxBound, double uv)
+{
+	if (maxBound - minBound <= 1.0)
+		return (minBound + maxBound) * 0.5;
+	return minBound + 0.5 + uv * ((maxBound - 0.5) - (minBound + 0.5));
+}
+
 std::vector<unsigned char> ComposeTextTexture(
 	const FontAtlasBuildOutput& atlas,
 	const ShaderParameterDefinition& definition,
@@ -109,8 +142,8 @@ std::vector<unsigned char> ComposeTextTexture(
 					if (x < 0 || x >= static_cast<int>(width))
 						continue;
 					const double u = (static_cast<double>(x) + 0.5 - destLeft) / destWidth;
-					const double atlasX = glyph.atlasLeft + u * (glyph.atlasRight - glyph.atlasLeft);
+					const double atlasX = GlyphAtlasCoordinate(glyph.atlasLeft, glyph.atlasRight, u);
-					const double atlasY = glyph.atlasTop + v * (glyph.atlasBottom - glyph.atlasTop);
+					const double atlasY = GlyphAtlasCoordinate(glyph.atlasTop, glyph.atlasBottom, v);
 					unsigned char sample[4] = {};
 					SampleAtlasPixel(atlas, atlasX, atlasY, sample);
 					unsigned char* destination = texturePixels.data() + (static_cast<std::size_t>(y) * width + static_cast<std::size_t>(x)) * 4u;
@@ -145,7 +178,8 @@ bool PrepareRuntimeTextTextures(RuntimeShaderArtifact& artifact, std::string& er
 		if (definition.type != ShaderParameterType::Text)
 			continue;
 
-		const FontAtlasBuildOutput* atlas = FindAtlas(artifact, definition.fontId);
+		const std::string fontId = FontIdForTextDefinition(artifact, definition);
+		const FontAtlasBuildOutput* atlas = FindAtlas(artifact, fontId);
 		if (atlas == nullptr)
 		{
 			error = "No prepared font atlas is available for text parameter '" + definition.id + "'.";
@@ -153,7 +187,7 @@ bool PrepareRuntimeTextTextures(RuntimeShaderArtifact& artifact, std::string& er
 		}
 		if (atlas->width == 0 || atlas->height == 0 || atlas->rgbaPixels.empty() || atlas->glyphsByCodepoint.empty())
 		{
-			error = "Prepared font atlas data is empty for font '" + definition.fontId + "'.";
+			error = "Prepared font atlas data is empty for font '" + fontId + "'.";
 			return false;
 		}
 

src/shader/ShaderManifestParameters.cpp

@@ -189,6 +189,17 @@ bool ParseParameterDefinition(const JsonValue& parameterJson, ShaderParameterDef
 			if (!definition.fontId.empty() && !ValidateShaderIdentifier(definition.fontId, "parameters[].font", manifestPath, error))
 				return false;
 		}
+		if (const JsonValue* fontParameterValue = parameterJson.find("fontParameter"))
+		{
+			if (!fontParameterValue->isString())
+			{
+				error = "Text parameter 'fontParameter' must be a string for: " + definition.id;
+				return false;
+			}
+			definition.fontParameterId = fontParameterValue->asString();
+			if (!definition.fontParameterId.empty() && !ValidateShaderIdentifier(definition.fontParameterId, "parameters[].fontParameter", manifestPath, error))
+				return false;
+		}
 		if (const JsonValue* maxLengthValue = parameterJson.find("maxLength"))
 		{
 			if (!maxLengthValue->isNumber() || maxLengthValue->asNumber() < 1.0 || maxLengthValue->asNumber() > 256.0)

src/shader/ShaderTypes.h

@@ -36,6 +36,7 @@ struct ShaderParameterDefinition
 	std::string defaultEnumValue;
 	std::string defaultTextValue;
 	std::string fontId;
+	std::string fontParameterId;
 	unsigned maxLength = 64;
 	std::vector<ShaderParameterOption> enumOptions;
 };

tests/FontAtlasBuilderTests.cpp

@@ -82,13 +82,13 @@ void TestBuildsTextOverlayFontAtlas()
 		Expect(false, ("text overlay font atlas builds: " + error).c_str());
 		return;
 	}
-	Expect(outputs.size() == 1, "one font atlas output is produced");
+	Expect(outputs.size() == shaderPackage.fontAssets.size(), "one font atlas output is produced for each declared font");
-	if (!outputs.empty())
+	for (const RenderCadenceCompositor::FontAtlasBuildOutput& output : outputs)
 	{
-		Expect(std::filesystem::exists(outputs[0].imagePath), "font atlas image exists");
+		Expect(std::filesystem::exists(output.imagePath), "font atlas image exists");
-		Expect(std::filesystem::exists(outputs[0].jsonPath), "font atlas json exists");
+		Expect(std::filesystem::exists(output.jsonPath), "font atlas json exists");
-		Expect(std::filesystem::file_size(outputs[0].imagePath) > 0, "font atlas image is not empty");
+		Expect(std::filesystem::file_size(output.imagePath) > 0, "font atlas image is not empty");
-		Expect(std::filesystem::file_size(outputs[0].jsonPath) > 0, "font atlas json is not empty");
+		Expect(std::filesystem::file_size(output.jsonPath) > 0, "font atlas json is not empty");
 	}
 }
 }

tests/RenderCadenceCompositorRuntimeLayerModelTests.cpp

@@ -62,17 +62,20 @@ std::string AllParametersShaderManifest()
 		"description": "All parameter restore test shader",
 		"category": "Tests",
 		"entryPoint": "shadeVideo",
-		"fonts": [{ "id": "inter", "path": "Inter.ttf" }],
+		"fonts": [
+			{ "id": "inter", "path": "Inter.ttf" },
+			{ "id": "mono", "path": "Mono.ttf" }
+		],
 		"parameters": [
 			{ "id": "gain", "label": "Gain", "type": "float", "default": 0.5, "min": 0.0, "max": 1.0 },
 			{ "id": "offset", "label": "Offset", "type": "vec2", "default": [0.0, 0.0], "min": [-1.0, -1.0], "max": [1.0, 1.0] },
 			{ "id": "tint", "label": "Tint", "type": "color", "default": [1.0, 1.0, 1.0, 1.0], "min": [0.0, 0.0, 0.0, 0.0], "max": [1.0, 1.0, 1.0, 1.0] },
 			{ "id": "enabled", "label": "Enabled", "type": "bool", "default": true },
-			{ "id": "mode", "label": "Mode", "type": "enum", "default": "soft", "options": [
+			{ "id": "mode", "label": "Mode", "type": "enum", "default": "inter", "options": [
-				{ "value": "soft", "label": "Soft" },
+				{ "value": "inter", "label": "Inter" },
-				{ "value": "hard", "label": "Hard" }
+				{ "value": "mono", "label": "Mono" }
 			] },
-			{ "id": "titleText", "label": "Title", "type": "text", "default": "DEFAULT", "font": "inter", "maxLength": 8 },
+			{ "id": "titleText", "label": "Title", "type": "text", "default": "DEFAULT", "font": "inter", "fontParameter": "mode", "maxLength": 8 },
 			{ "id": "drop", "label": "Drop", "type": "trigger" }
 		]
 	})";
@@ -94,10 +97,10 @@ RenderCadenceCompositor::SupportedShaderCatalog MakeCatalog(std::filesystem::pat
 	return LoadCatalog(root);
 }
 
-RenderCadenceCompositor::FontAtlasBuildOutput MakeFakeFontAtlas()
+RenderCadenceCompositor::FontAtlasBuildOutput MakeFakeFontAtlas(const std::string& fontId = "inter")
 {
 	RenderCadenceCompositor::FontAtlasBuildOutput atlas;
-	atlas.fontId = "inter";
+	atlas.fontId = fontId;
 	atlas.width = 2;
 	atlas.height = 2;
 	atlas.ascender = -0.8;
@@ -226,6 +229,7 @@ void TestInitializeFromRuntimeStateRestoresLayerStack()
 	WriteFile(root / "solid" / "shader.json", SolidShaderManifest(0.5, false));
 	WriteFile(root / "all-params" / "shader.slang", "float4 shadeVideo(float2 uv) { return float4(uv, 0.0, 1.0); }\n");
 	WriteFile(root / "all-params" / "Inter.ttf", "not a real font, but enough for restore catalog support checks");
+	WriteFile(root / "all-params" / "Mono.ttf", "not a real font, but enough for restore catalog support checks");
 	WriteFile(root / "all-params" / "shader.json", AllParametersShaderManifest());
 	RenderCadenceCompositor::SupportedShaderCatalog catalog = LoadCatalog(root);
 
@@ -242,7 +246,7 @@ void TestInitializeFromRuntimeStateRestoresLayerStack()
 					"offset": [0.25, -0.5],
 					"tint": [0.1, 0.2, 0.3, 0.4],
 					"enabled": false,
-					"mode": "hard",
+					"mode": "mono",
 					"titleText": "RESTORED-TEXT",
 					"drop": 4
 				}
@@ -275,7 +279,7 @@ void TestInitializeFromRuntimeStateRestoresLayerStack()
 	Expect(snapshot.displayLayers[0].parameterValues.at("offset").numberValues == std::vector<double>({ 0.25, -0.5 }), "restore preserves vec2 parameter values");
 	Expect(snapshot.displayLayers[0].parameterValues.at("tint").numberValues == std::vector<double>({ 0.1, 0.2, 0.3, 0.4 }), "restore preserves color parameter values");
 	Expect(!snapshot.displayLayers[0].parameterValues.at("enabled").booleanValue, "restore preserves boolean parameter values");
-	Expect(snapshot.displayLayers[0].parameterValues.at("mode").enumValue == "hard", "restore preserves enum parameter values");
+	Expect(snapshot.displayLayers[0].parameterValues.at("mode").enumValue == "mono", "restore preserves enum parameter values");
 	Expect(snapshot.displayLayers[0].parameterValues.at("titleText").textValue == "RESTORED", "restore normalizes and preserves text parameter values");
 	Expect(snapshot.displayLayers[0].parameterValues.at("drop").numberValues.front() == 4.0, "restore preserves trigger counts");
 	Expect(snapshot.displayLayers[1].id == "layer-33", "restore preserves later supported layer order");
@@ -488,6 +492,7 @@ void TestTextTexturesArePreparedInRuntimeModel()
 	std::filesystem::path root = MakeTestRoot();
 	WriteFile(root / "all-params" / "shader.slang", "float4 shadeVideo(float2 uv) { return float4(uv, 0.0, 1.0); }\n");
 	WriteFile(root / "all-params" / "Inter.ttf", "not a real font, but enough for catalog support checks");
+	WriteFile(root / "all-params" / "Mono.ttf", "not a real font, but enough for catalog support checks");
 	WriteFile(root / "all-params" / "shader.json", AllParametersShaderManifest());
 	RenderCadenceCompositor::SupportedShaderCatalog catalog = LoadCatalog(root);
 
@@ -503,6 +508,7 @@ void TestTextTexturesArePreparedInRuntimeModel()
 	artifact.fragmentShaderSource = "void main(){}";
 	artifact.parameterDefinitions = snapshot.displayLayers[0].parameterDefinitions;
 	artifact.fontAtlases.push_back(MakeFakeFontAtlas());
+	artifact.fontAtlases.push_back(MakeFakeFontAtlas("mono"));
 	artifact.message = "build ready";
 	Expect(model.MarkBuildReady(artifact, error), error.empty() ? "ready text artifact prepares textures" : error);
 
@@ -520,6 +526,12 @@ void TestTextTexturesArePreparedInRuntimeModel()
 	Expect(preparedUpdated.textValue == "AB", "updated text is prepared before render snapshot");
 	Expect(preparedUpdated.rgbaPixels && preparedUpdated.rgbaPixels != preparedDefault.rgbaPixels, "updated text receives a new prepared pixel payload");
 
+	Expect(model.UpdateParameter(model.FirstLayerId(), "mode", JsonValue("mono"), error), error.empty() ? "font selector update prepares texture" : error);
+	snapshot = model.Snapshot();
+	const RuntimePreparedTextTexture preparedWithNewFont = snapshot.renderLayers[0].artifact.preparedTextTextures[0];
+	Expect(preparedWithNewFont.textValue == "AB", "font selector update preserves current text");
+	Expect(preparedWithNewFont.rgbaPixels && preparedWithNewFont.rgbaPixels != preparedUpdated.rgbaPixels, "font selector update receives a new prepared pixel payload");
+
 	std::filesystem::remove_all(root);
 }
 }

tests/RenderCadenceCompositorSupportedShaderCatalogTests.cpp

@@ -174,6 +174,65 @@ void SupportsTextParametersWithDeclaredFont()
 	Expect(result.reason.empty(), "supported text parameters should not report a rejection reason");
 }
 
+void SupportsTextParametersWithFontSelector()
+{
+	ShaderPackage shaderPackage = MakeSinglePassPackage();
+	ShaderFontAsset roboto;
+	roboto.id = "roboto";
+	shaderPackage.fontAssets.push_back(roboto);
+	ShaderFontAsset mono;
+	mono.id = "mono";
+	shaderPackage.fontAssets.push_back(mono);
+
+	ShaderParameterDefinition fontSelector;
+	fontSelector.id = "font";
+	fontSelector.type = ShaderParameterType::Enum;
+	fontSelector.defaultEnumValue = "roboto";
+	fontSelector.enumOptions = { { "roboto", "Roboto" }, { "mono", "Mono" } };
+	shaderPackage.parameters.push_back(fontSelector);
+
+	ShaderParameterDefinition parameter;
+	parameter.id = "caption";
+	parameter.type = ShaderParameterType::Text;
+	parameter.fontId = "roboto";
+	parameter.fontParameterId = "font";
+	shaderPackage.parameters.push_back(parameter);
+
+	const RenderCadenceCompositor::ShaderSupportResult result =
+		RenderCadenceCompositor::CheckStatelessSinglePassShaderSupport(shaderPackage);
+
+	Expect(result.supported, "text parameters with font selector enum should be supported");
+	Expect(result.reason.empty(), "supported font selector text parameters should not report a rejection reason");
+}
+
+void RejectsTextParametersWithFontSelectorUnknownOption()
+{
+	ShaderPackage shaderPackage = MakeSinglePassPackage();
+	ShaderFontAsset roboto;
+	roboto.id = "roboto";
+	shaderPackage.fontAssets.push_back(roboto);
+
+	ShaderParameterDefinition fontSelector;
+	fontSelector.id = "font";
+	fontSelector.type = ShaderParameterType::Enum;
+	fontSelector.defaultEnumValue = "roboto";
+	fontSelector.enumOptions = { { "roboto", "Roboto" }, { "missing", "Missing" } };
+	shaderPackage.parameters.push_back(fontSelector);
+
+	ShaderParameterDefinition parameter;
+	parameter.id = "caption";
+	parameter.type = ShaderParameterType::Text;
+	parameter.fontId = "roboto";
+	parameter.fontParameterId = "font";
+	shaderPackage.parameters.push_back(parameter);
+
+	const RenderCadenceCompositor::ShaderSupportResult result =
+		RenderCadenceCompositor::CheckStatelessSinglePassShaderSupport(shaderPackage);
+
+	Expect(!result.supported, "font selector enum options must reference declared font assets");
+	Expect(result.reason.find("unknown font asset") != std::string::npos, "font selector rejection mentions unknown font asset");
+}
+
 void BuildsDeclaredFontAtlasesDuringCatalogLoad()
 {
 	std::string msdfReason;
@@ -217,6 +276,8 @@ int main()
 	RejectsTextureAssets();
 	RejectsTextParametersWithoutDeclaredFont();
 	SupportsTextParametersWithDeclaredFont();
+	SupportsTextParametersWithFontSelector();
+	RejectsTextParametersWithFontSelectorUnknownOption();
 	BuildsDeclaredFontAtlasesDuringCatalogLoad();
 
 	if (gFailures != 0)

tests/ShaderPackageRegistryTests.cpp

@@ -49,6 +49,7 @@ void TestValidManifest()
 	const std::filesystem::path root = MakeTestRoot();
 	WriteFile(root / "look" / "mask.png", "not a real png, but enough for existence checks");
 	WriteFile(root / "look" / "Inter.ttf", "not a real font, but enough for existence checks");
+	WriteFile(root / "look" / "Mono.ttf", "not a real font, but enough for existence checks");
 	WriteShaderPackage(root, "look", R"({
 		"id": "look-01",
 		"name": "Look 01",
@@ -56,15 +57,18 @@ void TestValidManifest()
 		"category": "Tests",
 		"entryPoint": "shadeVideo",
 		"textures": [{ "id": "maskTex", "path": "mask.png" }],
-		"fonts": [{ "id": "inter", "path": "Inter.ttf" }],
+		"fonts": [
+			{ "id": "inter", "path": "Inter.ttf" },
+			{ "id": "mono", "path": "Mono.ttf" }
+		],
 		"temporal": { "enabled": true, "historySource": "source", "historyLength": 8 },
 		"feedback": { "enabled": true },
 		"parameters": [
 			{ "id": "gain", "label": "Gain", "description": "Scales the output intensity.", "type": "float", "default": 0.5, "min": 0, "max": 1 },
-			{ "id": "titleText", "label": "Title", "type": "text", "default": "LIVE", "font": "inter", "maxLength": 32 },
+			{ "id": "titleText", "label": "Title", "type": "text", "default": "LIVE", "font": "inter", "fontParameter": "mode", "maxLength": 32 },
-			{ "id": "mode", "label": "Mode", "type": "enum", "default": "soft", "options": [
+			{ "id": "mode", "label": "Mode", "type": "enum", "default": "inter", "options": [
-				{ "value": "soft", "label": "Soft" },
+				{ "value": "inter", "label": "Inter" },
-				{ "value": "hard", "label": "Hard" }
+				{ "value": "mono", "label": "Mono" }
 			] },
 			{ "id": "flash", "label": "Flash", "type": "trigger" }
 		]
@@ -76,12 +80,13 @@ void TestValidManifest()
 	Expect(registry.ParseManifest(root / "look" / "shader.json", package, error), "valid manifest parses");
 	Expect(package.id == "look-01", "manifest id is preserved");
 	Expect(package.textureAssets.size() == 1 && package.textureAssets[0].id == "maskTex", "texture assets parse");
-	Expect(package.fontAssets.size() == 1 && package.fontAssets[0].id == "inter", "font assets parse");
+	Expect(package.fontAssets.size() == 2 && package.fontAssets[0].id == "inter", "font assets parse");
 	Expect(package.temporal.enabled && package.temporal.effectiveHistoryLength == 4, "temporal history is capped");
 	Expect(package.feedback.enabled && package.feedback.writePassId == "main", "feedback defaults to the implicit main pass");
 	Expect(package.parameters.size() == 4, "parameters parse");
 	Expect(package.parameters[0].description == "Scales the output intensity.", "parameter descriptions parse");
 	Expect(package.parameters[1].type == ShaderParameterType::Text && package.parameters[1].defaultTextValue == "LIVE", "text parameter parses");
+	Expect(package.parameters[1].fontParameterId == "mode", "text font selector parameter parses");
 	Expect(package.parameters[3].type == ShaderParameterType::Trigger, "trigger parameter parses");
 	Expect(package.passes.size() == 1 && package.passes[0].id == "main", "legacy manifests get an implicit main pass");