Creating a Font Engine in DirectX11

Tim Lawton · 2012-11-28T15:34:10

Hey there, I've been trying to create a font engine using Rastertek's guide over at http://rastertek.com/dx11tut12.html I've come across a problem I can't seem to fix, I've created a struct which holds some data which is used to find the location and size of the font I am using from a image file (a .dds file). It initializes fine, but when it comes to rendering the struct's values are all 0. I'm going to show my font class and say whats going on, you can reference it all back from the tutorial linked above. If anyone who is experienced in DirectX11 could see a solution to this problem I'd be grateful Also the 'fontdata.txt" and "font.dds" are available on that link also Font.h //--------------------------------------------------\\ // Font.h under Text class \\ // handles texture for the font \\ //--------------------------------------------------\\ #ifndef _FONT_H #define _FONT_H //includes #include <D3D11.h> #include <D3DX10math.h> #include <fstream> using namespace std; #include "Texture.h" //class class Font { private: struct FontType { float left, right; int size; }; struct VertexType { D3DXVECTOR3 position; D3DXVECTOR2 texture; }; public: Font(); Font(const Font&); ~Font(); bool Init(ID3D11Device*, char*, CHAR*); void Shutdown(); ID3D11ShaderResourceView* GetTexture(); void BuildVertexArray(void*, char*, float, float); private: bool LoadFontData(char*); void ReleaseFontData(); bool LoadTexture(ID3D11Device*, CHAR*); void ReleaseTexture(); private: FontType* fonttype; Texture* texture; }; #endif Font.cpp //--------------------------------------------------\\ // Font.cpp under Text class \\ // handles texture for the font \\ //--------------------------------------------------\\ #include "Font.h" Font::Font() { fonttype = 0; texture = 0; } Font::Font(const Font& other){} Font::~Font(){} bool Font::Init(ID3D11Device* device, char* fontFilename, CHAR* textureFilename) { bool result; //Load in the text file containing the font data. result = LoadFontData(fontFilename); if(!result) { return false; } // Load the texture that has the font characters on it. result = LoadTexture(device, textureFilename); if(!result) { return false; } return true; } void Font::Shutdown() { //Release the font texture. ReleaseTexture(); //Release the font data. ReleaseFontData(); return; } bool Font::LoadFontData(char* filename) { ifstream fin; int i; char temp; //Create the font spacing buffer fonttype = new FontType[95]; if(!fonttype) { return false; } //Read in the font size and spacing between chars fin.open(filename); if(fin.fail()) { return false; } //Read in the 95 used ascii characters for text. for(i=0; i<95; i++) { fin.get(temp); while(temp != ' ') { fin.get(temp); } fin.get(temp); while(temp != ' ') { fin.get(temp); } fin >> fonttype.left; fin >> fonttype.right; fin >> fonttype.size; } // Close the file. fin.close(); return true; } void Font::ReleaseFontData() { // Release the font data array. if(fonttype) { delete [] fonttype; fonttype = 0; } return; } bool Font::LoadTexture(ID3D11Device* device, CHAR* filename) { bool result; //Create the texture object. texture = new Texture; if(!texture) { return false; } //Initialize the texture object. result = texture->Init(device, filename); if(!result) { return false; } return true; } void Font::ReleaseTexture() { //Release the texture object. if(texture) { texture->Shutdown(); delete texture; texture = 0; } return; } ID3D11ShaderResourceView* Font::GetTexture() { return texture->GetTexture(); } void Font::BuildVertexArray(void* vertices, char* sentence, float drawX, float drawY) { VertexType* vertexPtr; int numLetters, index, i, letter; // Coerce the input vertices into a VertexType structure. vertexPtr = (VertexType*)vertices; // Get the number of letters in the sentence. numLetters = (int)strlen(sentence); // Initialize the index to the vertex array. index = 0; // Draw each letter onto a quad. for(i=0; i<numLetters; i++) { letter = ((int)sentence) - 32; // If the letter is a space then just move over three pixels. if(letter == 0) { drawX = drawX + 3.0f; } else { // First triangle in quad. vertexPtr[index].position = D3DXVECTOR3(drawX, drawY, 0.0f); // Top left. vertexPtr[index].texture = D3DXVECTOR2(fonttype[letter].left, 0.0f); index++; vertexPtr[index].position = D3DXVECTOR3((drawX + fonttype[letter].size), (drawY - 16), 0.0f); // Bottom right. vertexPtr[index].texture = D3DXVECTOR2(fonttype[letter].right, 1.0f); index++; vertexPtr[index].position = D3DXVECTOR3(drawX, (drawY - 16), 0.0f); // Bottom left. vertexPtr[index].texture = D3DXVECTOR2(fonttype[letter].left, 1.0f); index++; // Second triangle in quad. vertexPtr[index].position = D3DXVECTOR3(drawX, drawY, 0.0f); // Top left. vertexPtr[index].texture = D3DXVECTOR2(fonttype[letter].left, 0.0f); index++; vertexPtr[index].position = D3DXVECTOR3(drawX + fonttype[letter].size, drawY, 0.0f); // Top right. vertexPtr[index].texture = D3DXVECTOR2(fonttype[letter].right, 0.0f); index++; vertexPtr[index].position = D3DXVECTOR3((drawX + fonttype[letter].size), (drawY - 16), 0.0f); // Bottom right. vertexPtr[index].texture = D3DXVECTOR2(fonttype[letter].right, 1.0f); index++; // Update the x location for drawing by the size of the letter and one pixel. drawX = drawX + fonttype[letter].size + 1.0f; } } return; } During the while loop that fills up the array, it starts to store the data. But when it gets to 'drawX = drawX + fonttype[letter].size + 1.0f;' the fonttype array is empty, and stores all 0s for left, right and size. Any ideas? EDIT: to get a better understanding of what I mean, you can see here the fonttype is holding values: http://img651.imageshack.us/img651/9278/fonttypefilled.png But at the end of the method it is empty: http://img715.imageshack.us/img715/3660/fonttypeempty.png I'm stumped

Graphics and GPU Programming Programming DX11

Started by Tim Lawton November 26, 2012 04:51 PM

14 comments, last by Tim Lawton 11 years, 4 months ago

Tim Lawton

179

Author

November 28, 2012 06:43 AM

That is ridiculously easy, thanks

Tim Lawton

179

Author

November 28, 2012 06:54 AM

Also lets say I want to replace my own text with some other value, such as FPS? I could just replace the _T("HELLO") with fps->getfps() for example?

kauna

2,925

November 28, 2012 12:59 PM

Well, the second parameter is just a pointer to a TCHAR string in this case so you may use the required string construction functions to manipulate a TCHAR array to contain the desired text. http://msdn.microsoft.com/en-us/library/ybk95axf.aspx contains some string manipulation functions.

Cheers!

Tim Lawton

179

Author

November 28, 2012 02:24 PM

This is horrible, I have no idea how to link this up or anything, including its folders though the Linker didnt do anything

kauna

2,925

November 28, 2012 03:12 PM

http://fw1.codeplex.com/releases/view/75558 <- from this page download FW1FontWrapper 1.1, Header, Lib & DLL x86/x64, you don't need the source code.

Include the lib in your project and put the DLL in your program directory. Include the .h file to your text rendering code and then the code should work.

Cheers!

Tim Lawton

179

Author

November 28, 2012 03:34 PM

Thanks alot for your help kauna, but I have finally fixed my own broken version! turns out the Font.vs HLSL had this line:

float4 position : POSITION;

when it should of been

float4 position : SV_POSITION;

Creating a Font Engine in DirectX11

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Creating a Font Engine in DirectX11

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