faster method for texture handling

MshViewer/Header/Object.h

@@ -21,7 +21,7 @@ struct ChunkHeader {
 };
 
 struct Segment {
-	std::string texture			= "";
+	std::uint32_t textureIndex	= 0;
 	float* vertex				= nullptr;
 	float* uv					= nullptr;
 	std::uint32_t* mesh			= nullptr;
@@ -65,5 +65,6 @@ private:
 
 public:
 	std::vector<Modl*> getModels() const;
+	std::vector<std::string> getTextureList() const;
 
 };

MshViewer/Source/Object.cpp

@@ -393,15 +393,7 @@ void Object::analyseSegmChunks(Modl * dataDestination, std::list<ChunkHeader*>&
 		if (!strcmp("MATI", (*it)->name))
 		{
 			fsMesh.seekg((*it)->position);
-			std::uint32_t tempIndex;
-			fsMesh.read(reinterpret_cast<char*>(&tempIndex), sizeof(tempIndex));
-			if (vTextures.size() <= tempIndex)
-			{
-				std::cout << "warning texture index <" << tempIndex << "> unknown" << std::endl;
-				tempData->texture = "";
-				continue;
-			}
-			tempData->texture = vTextures[tempIndex];
+			fsMesh.read(reinterpret_cast<char*>(&tempData->textureIndex), sizeof(tempData->textureIndex));
 			continue;
 		}
 
@@ -471,7 +463,25 @@ void Object::analyseClthChunks(Modl * dataDestination, std::list<ChunkHeader*>&
 			char* buffer = new char[(*it)->size];
 			*buffer = { 0 };
 			fsMesh.read(buffer, (*it)->size);
-			tempData->texture = buffer;
+
+			bool tempFound(false);
+
+			for (unsigned int index = 0; index < vTextures.size(); index++)
+			{
+				if (!strcmp(buffer, vTextures[index].c_str()))
+				{
+					tempData->textureIndex = index;
+					tempFound = true;
+					break;
+				}
+			}
+
+			if (!tempFound)
+			{
+				vTextures.push_back(std::string(buffer));
+				tempData->textureIndex = vTextures.size() - 1;
+			}
+
 			delete buffer;
 			continue;
 		}
@@ -540,6 +550,11 @@ std::vector<Modl*> Object::getModels() const
 	return vModls;
 }
 
+std::vector<std::string> Object::getTextureList() const
+{
+	return vTextures;
+}
+
 
 /////////////////////////////////////////////////////////////////////////
 // public functions

MshViewer/Source/OpenGlController.cpp

@@ -302,7 +302,6 @@ void OpenGLController::updateScene()
 	glUniform1i(gluiSamplerID, 0);
 
 	int instanceOffset(0);
-	int textureIndex(0);
 
 	for (unsigned int modelIndex = 0; modelIndex < vModels.size(); modelIndex++)
 	{
@@ -316,16 +315,18 @@ void OpenGLController::updateScene()
 		for (auto& segIt : vModels[modelIndex]->segmLst)
 		{
 			// give texture to the shader
+			std::uint32_t tempTexIndex = segIt->textureIndex >= vTextures.size() ? vTextures.size() - 1 : segIt->textureIndex;
+			
 			glTexImage2D(
 				GL_TEXTURE_2D,
 				0,
-				vTextures[textureIndex]->alpha ? GL_RGBA : GL_RGB,
-				vTextures[textureIndex]->width,
-				vTextures[textureIndex]->height,
+				vTextures[tempTexIndex]->alpha ? GL_RGBA : GL_RGB,
+				vTextures[tempTexIndex]->width,
+				vTextures[tempTexIndex]->height,
 				0,
-				vTextures[textureIndex]->alpha ? GL_BGRA : GL_BGR,
+				vTextures[tempTexIndex]->alpha ? GL_BGRA : GL_BGR,
 				GL_UNSIGNED_BYTE,
-				vTextures[textureIndex]->data->data()
+				vTextures[tempTexIndex]->data->data()
 			);
 
 			glGenerateMipmap(GL_TEXTURE_2D);
@@ -335,9 +336,8 @@ void OpenGLController::updateScene()
 
 			glDrawArrays(GL_TRIANGLES, instanceOffset, segIt->meshSize);
 
-			// recalulate counter
+			// increase the offset
 			instanceOffset += segIt->meshSize;
-			textureIndex++;
 		}
 	}
 
@@ -350,11 +350,14 @@ void OpenGLController::loadMsh(const char * path)
 	// clean up old stuff first
 	deleteVectors();
 
+	std::vector<std::string> tempTexList;
+
 	// get all models
 	try
 	{
 		Object obj(path);
 		vModels = obj.getModels();
+		tempTexList = obj.getTextureList();
 	}
 	catch (std::invalid_argument e)
 	{
@@ -407,42 +410,46 @@ void OpenGLController::loadMsh(const char * path)
 	glBindBuffer(GL_ARRAY_BUFFER, 0);
 
 
-	// get textures
-	for (auto& modIt : vModels)
-	{
-		// we don't need textures from null, bones, shadowMesh and hidden things, since they are not displayed
-		if (modIt->type == null || modIt->type == bone || modIt->type == shadowMesh || modIt->renderFlags == 1)
-			continue;
-		for (auto& segIt : modIt->segmLst)
-		{
-			textureData* tempData = new textureData;
-			try
-			{
-				if (segIt->texture == "")
-					throw std::invalid_argument("no texture name");
-
-				std::string tempPath = path;
+	// get textures path
+	std::string tempPath = path;
 
-				while (tempPath.back() != '/' && tempPath.back() != '\\')
-					tempPath.pop_back();
+	while (tempPath.back() != '/' && tempPath.back() != '\\')
+		tempPath.pop_back();
 
-				TextureTGA tempTex(std::string(tempPath + segIt->texture).c_str());
+	// load all textures;
+	for (auto& texIt : tempTexList)
+	{
+		textureData* tempData = new textureData;
 
-				tempData->alpha = tempTex.hasAlpha();
-				tempData->width = tempTex.getWidth();
-				tempData->height = tempTex.getHeight();
-				tempData->data = new std::vector<std::uint8_t>(tempTex.getData());
-			}
-			catch (std::invalid_argument e)
-			{
-				GLubyte solidColor[4] = { 0, 0, 255, 255 };
-				tempData->alpha = true;
-				tempData->width = 1;
-				tempData->height = 1;
-				tempData->data = new std::vector<std::uint8_t>({ 0, 0, 255, 255 });
-			}
+		try
+		{
+			TextureTGA tempTex(std::string(tempPath + texIt).c_str());
 
-			vTextures.push_back(tempData);
+			tempData->alpha = tempTex.hasAlpha();
+			tempData->width = tempTex.getWidth();
+			tempData->height = tempTex.getHeight();
+			tempData->data = new std::vector<std::uint8_t>(tempTex.getData());
 		}
+		catch (std::invalid_argument e)
+		{
+			GLubyte solidColor[4] = { 0, 0, 255, 255 };
+			tempData->alpha = true;
+			tempData->width = 1;
+			tempData->height = 1;
+			tempData->data = new std::vector<std::uint8_t>({ 0, 0, 255, 255 });
+		}
+
+		vTextures.push_back(tempData);
 	}
+
+	// add a solid default color at the end (maybe there is an invalid index later)
+	textureData* tempData = new textureData;
+	GLubyte solidColor[4] = { 0, 0, 255, 255 };
+	tempData->alpha = true;
+	tempData->width = 1;
+	tempData->height = 1;
+	tempData->data = new std::vector<std::uint8_t>({ 0, 0, 255, 255 });
+	vTextures.push_back(tempData);
+
+	tempTexList.clear();
 }