INtial text again

src/render/runtime/RuntimeTextTextureCache.h

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+#pragma once
+
+#include "GLExtensions.h"
+#include "../../runtime/RuntimeShaderArtifact.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+class RuntimeTextTextureCache
+{
+public:
+	RuntimeTextTextureCache() = default;
+	RuntimeTextTextureCache(const RuntimeTextTextureCache&) = delete;
+	RuntimeTextTextureCache& operator=(const RuntimeTextTextureCache&) = delete;
+	~RuntimeTextTextureCache();
+
+	bool Configure(const RuntimeShaderArtifact& artifact, std::string& error);
+	void UpdateArtifactState(const RuntimeShaderArtifact& artifact);
+	void BindTextTextures(GLuint program);
+	void ShutdownGl();
+
+	static void AssignSamplerUniforms(GLuint program, const RuntimeShaderArtifact& artifact);
+
+private:
+	struct Glyph
+	{
+		double advance = 0.0;
+		double planeLeft = 0.0;
+		double planeTop = 0.0;
+		double planeRight = 0.0;
+		double planeBottom = 0.0;
+		double atlasLeft = 0.0;
+		double atlasTop = 0.0;
+		double atlasRight = 0.0;
+		double atlasBottom = 0.0;
+		bool hasBounds = false;
+	};
+
+	struct Atlas
+	{
+		std::string fontId;
+		unsigned width = 0;
+		unsigned height = 0;
+		double ascender = -0.9;
+		double descender = 0.25;
+		double lineHeight = 1.2;
+		std::vector<unsigned char> rgbaPixels;
+		std::map<unsigned, Glyph> glyphsByCodepoint;
+	};
+
+	struct TextTexture
+	{
+		std::string parameterId;
+		std::string fontId;
+		std::string cachedText;
+		GLuint texture = 0;
+		unsigned width = 0;
+		unsigned height = 0;
+	};
+
+	bool LoadAtlas(const RenderCadenceCompositor::FontAtlasBuildOutput& output, Atlas& atlas, std::string& error) const;
+	bool LoadAtlasJson(const RenderCadenceCompositor::FontAtlasBuildOutput& output, Atlas& atlas, std::string& error) const;
+	bool LoadAtlasImage(const RenderCadenceCompositor::FontAtlasBuildOutput& output, Atlas& atlas, std::string& error) const;
+	bool EnsureTextTexture(TextTexture& texture);
+	std::vector<unsigned char> ComposeTextMask(const Atlas& atlas, const std::string& text, unsigned& width, unsigned& height) const;
+	const Atlas* FindAtlas(const std::string& fontId) const;
+	static const ShaderParameterValue* FindParameterValue(const RuntimeShaderArtifact& artifact, const std::string& parameterId);
+	static std::string DefaultTextValue(const RuntimeShaderArtifact& artifact, const std::string& parameterId);
+	static unsigned char SampleAtlasAlpha(const Atlas& atlas, double x, double y);
+	static void DestroyTexture(TextTexture& texture);
+
+	RuntimeShaderArtifact mArtifact;
+	std::vector<Atlas> mAtlases;
+	std::vector<TextTexture> mTextTextures;
+};