Font working

2026-05-05 23:47:08 +10:00
parent 3e8b472f74
commit 62c3ded1f8
9 changed files with 220 additions and 36 deletions
--- a/apps/LoopThroughWithOpenGLCompositing/OpenGLComposite.cpp
+++ b/apps/LoopThroughWithOpenGLCompositing/OpenGLComposite.cpp
@@ -47,6 +47,7 @@
 #include <cstdint>
 #include <cstring>
 #include <cctype>
+#include <fstream>
 #include <gdiplus.h>
 #include <wincodec.h>
 #include <limits>
@@ -106,6 +107,31 @@ const char* kDecodeFragmentShaderSource =
 	"	fragColor = rec709YCbCr2rgba(ySample, macroPixel.b, macroPixel.r, 1.0);\n"
 	"}\n";

+class GdiplusSession
+{
+public:
+	GdiplusSession()
+	{
+		Gdiplus::GdiplusStartupInput startupInput;
+		mStarted = Gdiplus::GdiplusStartup(&mToken, &startupInput, NULL) == Gdiplus::Ok;
+	}
+
+	~GdiplusSession()
+	{
+		if (mStarted)
+			Gdiplus::GdiplusShutdown(mToken);
+	}
+
+	GdiplusSession(const GdiplusSession&) = delete;
+	GdiplusSession& operator=(const GdiplusSession&) = delete;
+
+	bool started() const { return mStarted; }
+
+private:
+	ULONG_PTR mToken = 0;
+	bool mStarted = false;
+};
+
 void CopyErrorMessage(const std::string& message, int errorMessageSize, char* errorMessage)
 {
 	if (!errorMessage || errorMessageSize <= 0)
@@ -191,11 +217,87 @@ std::vector<unsigned char> BuildLocalSdf(const std::vector<unsigned char>& alpha
 	return sdf;
 }

+std::vector<unsigned char> FlipTextTextureForShaderUv(const std::vector<unsigned char>& pixels, unsigned width, unsigned height)
+{
+	std::vector<unsigned char> flipped(pixels.size(), 0);
+	const std::size_t stride = static_cast<std::size_t>(width) * 4;
+	for (unsigned y = 0; y < height; ++y)
+	{
+		const std::size_t srcOffset = static_cast<std::size_t>(y) * stride;
+		const std::size_t dstOffset = static_cast<std::size_t>(height - 1 - y) * stride;
+		std::memcpy(flipped.data() + dstOffset, pixels.data() + srcOffset, stride);
+	}
+	return flipped;
+}
+
+void WriteTextMaskDebugDump(const std::string& text, const std::vector<unsigned char>& alpha, const std::vector<unsigned char>& sdf, unsigned width, unsigned height)
+{
+	try
+	{
+		std::filesystem::path debugDir = std::filesystem::current_path() / "runtime";
+		std::filesystem::create_directories(debugDir);
+
+		auto writePgm = [width, height](const std::filesystem::path& path, const std::vector<unsigned char>& gray, std::size_t stride)
+		{
+			std::ofstream out(path, std::ios::binary);
+			if (!out)
+				return;
+			out << "P5\n" << width << " " << height << "\n255\n";
+			for (unsigned y = 0; y < height; ++y)
+			{
+				for (unsigned x = 0; x < width; ++x)
+					out.put(static_cast<char>(gray[(static_cast<std::size_t>(y) * width + x) * stride]));
+			}
+		};
+
+		writePgm(debugDir / "text-mask-alpha-debug.pgm", alpha, 1);
+		writePgm(debugDir / "text-mask-sdf-debug.pgm", sdf, 4);
+
+		unsigned alphaMin = 255;
+		unsigned alphaMax = 0;
+		unsigned sdfMin = 255;
+		unsigned sdfMax = 0;
+		std::size_t alphaLit = 0;
+		std::size_t sdfLit = 0;
+		for (unsigned char value : alpha)
+		{
+			alphaMin = std::min<unsigned>(alphaMin, value);
+			alphaMax = std::max<unsigned>(alphaMax, value);
+			if (value > 0)
+				++alphaLit;
+		}
+		for (std::size_t index = 0; index < sdf.size(); index += 4)
+		{
+			const unsigned char value = sdf[index];
+			sdfMin = std::min<unsigned>(sdfMin, value);
+			sdfMax = std::max<unsigned>(sdfMax, value);
+			if (value > 127)
+				++sdfLit;
+		}
+
+		std::ostringstream message;
+		message << "Text mask debug for '" << text << "': alpha min/max/lit=" << alphaMin << "/" << alphaMax << "/" << alphaLit
+			<< ", sdf min/max/gt127=" << sdfMin << "/" << sdfMax << "/" << sdfLit << "\n";
+		OutputDebugStringA(message.str().c_str());
+	}
+	catch (...)
+	{
+		OutputDebugStringA("Failed to write text mask debug dump.\n");
+	}
+}
+
+GLint FindSamplerUniformLocation(GLuint program, const std::string& samplerName)
+{
+	GLint location = glGetUniformLocation(program, samplerName.c_str());
+	if (location >= 0)
+		return location;
+	return glGetUniformLocation(program, (samplerName + "_0").c_str());
+}
+
 bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& fontPath, std::vector<unsigned char>& sdf, std::string& error)
 {
-	ULONG_PTR gdiplusToken = 0;
-	Gdiplus::GdiplusStartupInput startupInput;
-	if (Gdiplus::GdiplusStartup(&gdiplusToken, &startupInput, NULL) != Gdiplus::Ok)
+	GdiplusSession gdiplus;
+	if (!gdiplus.started())
 	{
 		error = "Could not start GDI+ for text rendering.";
 		return false;
@@ -210,7 +312,6 @@ bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& font
 	{
 		if (fontCollection.AddFontFile(wideFontPath.c_str()) != Gdiplus::Ok)
 		{
-			Gdiplus::GdiplusShutdown(gdiplusToken);
 			error = "Could not load packaged font file for text rendering: " + fontPath.string();
 			return false;
 		}
@@ -218,7 +319,6 @@ bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& font
 		const INT familyCount = fontCollection.GetFamilyCount();
 		if (familyCount <= 0)
 		{
-			Gdiplus::GdiplusShutdown(gdiplusToken);
 			error = "Packaged font did not contain a usable font family: " + fontPath.string();
 			return false;
 		}
@@ -227,7 +327,6 @@ bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& font
 		INT found = 0;
 		if (fontCollection.GetFamilies(familyCount, families.get(), &found) != Gdiplus::Ok || found <= 0)
 		{
-			Gdiplus::GdiplusShutdown(gdiplusToken);
 			error = "Could not read the packaged font family: " + fontPath.string();
 			return false;
 		}
@@ -236,7 +335,9 @@ bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& font

 	Gdiplus::Bitmap bitmap(kTextTextureWidth, kTextTextureHeight, PixelFormat32bppARGB);
 	Gdiplus::Graphics graphics(&bitmap);
-	graphics.Clear(Gdiplus::Color(0, 0, 0, 0));
+	graphics.SetCompositingMode(Gdiplus::CompositingModeSourceCopy);
+	graphics.Clear(Gdiplus::Color(255, 0, 0, 0));
+	graphics.SetCompositingMode(Gdiplus::CompositingModeSourceOver);
 	graphics.SetTextRenderingHint(Gdiplus::TextRenderingHintAntiAliasGridFit);
 	graphics.SetSmoothingMode(Gdiplus::SmoothingModeHighQuality);
 	Gdiplus::Font font(fontFamily, 72.0f, Gdiplus::FontStyleRegular, Gdiplus::UnitPixel);
@@ -256,11 +357,17 @@ bool RasterizeTextSdf(const std::string& text, const std::filesystem::path& font
 		{
 			Gdiplus::Color pixel;
 			bitmap.GetPixel(x, y, &pixel);
-			alpha[static_cast<std::size_t>(y) * kTextTextureWidth + x] = pixel.GetAlpha();
+			BYTE luminance = pixel.GetRed();
+			if (pixel.GetGreen() > luminance)
+				luminance = pixel.GetGreen();
+			if (pixel.GetBlue() > luminance)
+				luminance = pixel.GetBlue();
+			alpha[static_cast<std::size_t>(y) * kTextTextureWidth + x] = static_cast<unsigned char>(luminance);
 		}
 	}
 	sdf = BuildLocalSdf(alpha, kTextTextureWidth, kTextTextureHeight);
-	Gdiplus::GdiplusShutdown(gdiplusToken);
+	sdf = FlipTextTextureForShaderUv(sdf, kTextTextureWidth, kTextTextureHeight);
+	WriteTextMaskDebugDump(text, alpha, sdf, kTextTextureWidth, kTextTextureHeight);
 	return true;
 }

@@ -1670,7 +1777,7 @@ bool OpenGLComposite::compileSingleLayerProgram(const RuntimeRenderState& state,
 		glUniformBlockBinding(newProgram.get(), globalParamsIndex, kGlobalParamsBindingPoint);

 	const unsigned historyCap = mRuntimeHost ? mRuntimeHost->GetMaxTemporalHistoryFrames() : 0;
-	const GLuint shaderTextureBase = kSourceHistoryTextureUnitBase + historyCap + historyCap;
+	const GLuint shaderTextureBase = state.isTemporal ? kSourceHistoryTextureUnitBase + historyCap + historyCap : kSourceHistoryTextureUnitBase;
 	glUseProgram(newProgram.get());
 	const GLint videoInputLocation = glGetUniformLocation(newProgram.get(), "gVideoInput");
 	if (videoInputLocation >= 0)
@@ -1689,14 +1796,14 @@ bool OpenGLComposite::compileSingleLayerProgram(const RuntimeRenderState& state,
 	}
 	for (std::size_t index = 0; index < textureBindings.size(); ++index)
 	{
-		const GLint textureSamplerLocation = glGetUniformLocation(newProgram.get(), textureBindings[index].samplerName.c_str());
+		const GLint textureSamplerLocation = FindSamplerUniformLocation(newProgram.get(), textureBindings[index].samplerName);
 		if (textureSamplerLocation >= 0)
 			glUniform1i(textureSamplerLocation, static_cast<GLint>(shaderTextureBase + static_cast<GLuint>(index)));
 	}
 	const GLuint textTextureBase = shaderTextureBase + static_cast<GLuint>(textureBindings.size());
 	for (std::size_t index = 0; index < textBindings.size(); ++index)
 	{
-		const GLint textSamplerLocation = glGetUniformLocation(newProgram.get(), textBindings[index].samplerName.c_str());
+		const GLint textSamplerLocation = FindSamplerUniformLocation(newProgram.get(), textBindings[index].samplerName);
 		if (textSamplerLocation >= 0)
 			glUniform1i(textSamplerLocation, static_cast<GLint>(textTextureBase + static_cast<GLuint>(index)));
 	}
@@ -1704,6 +1811,7 @@ bool OpenGLComposite::compileSingleLayerProgram(const RuntimeRenderState& state,

 	layerProgram.layerId = state.layerId;
 	layerProgram.shaderId = state.shaderId;
+	layerProgram.shaderTextureBase = shaderTextureBase;
 	layerProgram.program = newProgram.release();
 	layerProgram.vertexShader = newVertexShader.release();
 	layerProgram.fragmentShader = newFragmentShader.release();
@@ -1972,9 +2080,18 @@ bool OpenGLComposite::renderTextBindingTexture(const RuntimeRenderState& state,
 	if (!RasterizeTextSdf(text, fontPath, sdf, error))
 		return false;

+	GLint previousActiveTexture = 0;
+	GLint previousUnpackBuffer = 0;
+	glGetIntegerv(GL_ACTIVE_TEXTURE, &previousActiveTexture);
+	glGetIntegerv(GL_PIXEL_UNPACK_BUFFER_BINDING, &previousUnpackBuffer);
+	glActiveTexture(GL_TEXTURE0);
+	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 	glBindTexture(GL_TEXTURE_2D, textBinding.texture);
 	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kTextTextureWidth, kTextTextureHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, sdf.data());
 	glBindTexture(GL_TEXTURE_2D, 0);
+	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, static_cast<GLuint>(previousUnpackBuffer));
+	glActiveTexture(static_cast<GLenum>(previousActiveTexture));
+
 	textBinding.renderedText = text;
 	textBinding.renderedWidth = kTextTextureWidth;
 	textBinding.renderedHeight = kTextTextureHeight;
@@ -1983,8 +2100,7 @@ bool OpenGLComposite::renderTextBindingTexture(const RuntimeRenderState& state,

 void OpenGLComposite::bindLayerTextureAssets(const LayerProgram& layerProgram)
 {
-	const unsigned historyCap = mRuntimeHost ? mRuntimeHost->GetMaxTemporalHistoryFrames() : 0;
-	const GLuint shaderTextureBase = kSourceHistoryTextureUnitBase + historyCap + historyCap;
+	const GLuint shaderTextureBase = layerProgram.shaderTextureBase != 0 ? layerProgram.shaderTextureBase : kSourceHistoryTextureUnitBase;
 	for (std::size_t index = 0; index < layerProgram.textureBindings.size(); ++index)
 	{
 		glActiveTexture(GL_TEXTURE0 + shaderTextureBase + static_cast<GLuint>(index));
@@ -2023,7 +2139,7 @@ void OpenGLComposite::destroyDecodeShaderProgram()
 bool OpenGLComposite::validateTemporalTextureUnitBudget(const std::vector<RuntimeRenderState>& layerStates, std::string& error) const
 {
 	const unsigned historyCap = mRuntimeHost ? mRuntimeHost->GetMaxTemporalHistoryFrames() : 0;
-	unsigned maxAssetTextures = 0;
+	unsigned requiredUnits = kSourceHistoryTextureUnitBase;
 	for (const RuntimeRenderState& state : layerStates)
 	{
 		unsigned textTextureCount = 0;
@@ -2033,12 +2149,12 @@ bool OpenGLComposite::validateTemporalTextureUnitBudget(const std::vector<Runtim
 				++textTextureCount;
 		}
 		const unsigned totalShaderTextures = static_cast<unsigned>(state.textureAssets.size()) + textTextureCount;
-		if (totalShaderTextures > maxAssetTextures)
-			maxAssetTextures = totalShaderTextures;
+		const unsigned layerRequiredUnits = kSourceHistoryTextureUnitBase + (state.isTemporal ? historyCap + historyCap : 0u) + totalShaderTextures;
+		if (layerRequiredUnits > requiredUnits)
+			requiredUnits = layerRequiredUnits;
 	}
 	GLint maxTextureUnits = 0;
 	glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
-	const unsigned requiredUnits = kSourceHistoryTextureUnitBase + historyCap + historyCap + maxAssetTextures;
 	const unsigned availableUnits = maxTextureUnits > 0 ? static_cast<unsigned>(maxTextureUnits) : 0u;
 	if (requiredUnits > availableUnits)
 	{
@@ -2327,7 +2443,7 @@ void OpenGLComposite::renderShaderProgram(GLuint sourceTexture, GLuint destinati
 		glActiveTexture(GL_TEXTURE0 + kSourceHistoryTextureUnitBase + historyCap + index);
 		glBindTexture(GL_TEXTURE_2D, 0);
 	}
-	const GLuint shaderTextureBase = kSourceHistoryTextureUnitBase + historyCap + historyCap;
+	const GLuint shaderTextureBase = layerProgram.shaderTextureBase != 0 ? layerProgram.shaderTextureBase : kSourceHistoryTextureUnitBase;
 	for (std::size_t index = 0; index < layerProgram.textureBindings.size() + layerProgram.textBindings.size(); ++index)
 	{
 		glActiveTexture(GL_TEXTURE0 + shaderTextureBase + static_cast<GLuint>(index));