initial commit. This is icculus version 5542b94cae02a6333845854bbbd1abe0a259f1a4

2025-08-13 17:59:53 +00:00 · 2011-08-03 22:05:33 +02:00 · 2011-08-03 22:05:33 +02:00 · 3096eaf5e2
commit 3096eaf5e2
2519 changed files with 816064 additions and 0 deletions
--- a/ExternalLibs/FTGL/src/FTGLTextureFont.cpp
+++ b/ExternalLibs/FTGL/src/FTGLTextureFont.cpp
@ -0,0 +1,181 @@
+#include <cassert>
+#include <string> // For memset
+
+#include "FTGLTextureFont.h"
+#include "FTTextureGlyph.h"
+
+
+inline GLuint NextPowerOf2( GLuint in)
+{
+     in -= 1;
+
+     in |= in >> 16;
+     in |= in >> 8;
+     in |= in >> 4;
+     in |= in >> 2;
+     in |= in >> 1;
+
+     return in + 1;
+}
+
+
+FTGLTextureFont::FTGLTextureFont( const char* fontFilePath)
+:   FTFont( fontFilePath),
+    maximumGLTextureSize(0),
+    textureWidth(0),
+    textureHeight(0),
+    glyphHeight(0),
+    glyphWidth(0),
+    padding(3),
+    xOffset(0),
+    yOffset(0)
+{
+    remGlyphs = numGlyphs = face.GlyphCount();
+}
+
+
+FTGLTextureFont::FTGLTextureFont( const unsigned char *pBufferBytes, size_t bufferSizeInBytes)
+:   FTFont( pBufferBytes, bufferSizeInBytes),
+    maximumGLTextureSize(0),
+    textureWidth(0),
+    textureHeight(0),
+    glyphHeight(0),
+    glyphWidth(0),
+    padding(3),
+    xOffset(0),
+    yOffset(0)
+{
+    remGlyphs = numGlyphs = face.GlyphCount();
+}
+
+
+FTGLTextureFont::~FTGLTextureFont()
+{
+    glDeleteTextures( textureIDList.size(), (const GLuint*)&textureIDList[0]);
+}
+
+
+FTGlyph* FTGLTextureFont::MakeGlyph( unsigned int glyphIndex)
+{
+    FT_GlyphSlot ftGlyph = face.Glyph( glyphIndex, FT_LOAD_NO_HINTING);
+    
+    if( ftGlyph)
+    {
+        glyphHeight = static_cast<int>( charSize.Height());
+        glyphWidth = static_cast<int>( charSize.Width());
+        
+        if( textureIDList.empty())
+        {
+            textureIDList.push_back( CreateTexture());
+            xOffset = yOffset = padding;
+        }
+        
+        if( xOffset > ( textureWidth - glyphWidth))
+        {
+            xOffset = padding;
+            yOffset += glyphHeight;
+            
+            if( yOffset > ( textureHeight - glyphHeight))
+            {
+                textureIDList.push_back( CreateTexture());
+                yOffset = padding;
+            }
+        }
+        
+        FTTextureGlyph* tempGlyph = new FTTextureGlyph( ftGlyph, textureIDList[textureIDList.size() - 1],
+                                                        xOffset, yOffset, textureWidth, textureHeight);
+        xOffset += static_cast<int>( tempGlyph->BBox().upperX - tempGlyph->BBox().lowerX + padding);
+        
+        --remGlyphs;
+        return tempGlyph;
+    }
+    
+    err = face.Error();
+    return NULL;
+}
+
+
+void FTGLTextureFont::CalculateTextureSize()
+{
+    if( !maximumGLTextureSize)
+    {
+        glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&maximumGLTextureSize);
+        assert(maximumGLTextureSize); // If you hit this then you have an invalid OpenGL context.
+    }
+    
+    textureWidth = NextPowerOf2( (remGlyphs * glyphWidth) + ( padding * 2));
+    textureWidth = textureWidth > maximumGLTextureSize ? maximumGLTextureSize : textureWidth;
+    
+    int h = static_cast<int>( (textureWidth - ( padding * 2)) / glyphWidth);
+        
+    textureHeight = NextPowerOf2( (( numGlyphs / h) + 1) * glyphHeight);
+    textureHeight = textureHeight > maximumGLTextureSize ? maximumGLTextureSize : textureHeight;
+}
+
+
+GLuint FTGLTextureFont::CreateTexture()
+{   
+    CalculateTextureSize();
+    
+    int totalMemory = textureWidth * textureHeight;
+    unsigned char* textureMemory = new unsigned char[totalMemory];
+    memset( textureMemory, 0, totalMemory);
+
+    GLuint textID;
+    glGenTextures( 1, (GLuint*)&textID);
+
+    glBindTexture( GL_TEXTURE_2D, textID);
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexImage2D( GL_TEXTURE_2D, 0, GL_ALPHA, textureWidth, textureHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, textureMemory);
+
+    delete [] textureMemory;
+
+    return textID;
+}
+
+
+bool FTGLTextureFont::FaceSize( const unsigned int size, const unsigned int res)
+{
+    if( !textureIDList.empty())
+    {
+        glDeleteTextures( textureIDList.size(), (const GLuint*)&textureIDList[0]);
+        textureIDList.clear();
+        remGlyphs = numGlyphs = face.GlyphCount();
+    }
+
+    return FTFont::FaceSize( size, res);
+}
+
+
+void FTGLTextureFont::Render( const char* string)
+{   
+    glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
+    glEnable(GL_BLEND);
+    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
+
+    FTTextureGlyph::ResetActiveTexture();
+    
+    FTFont::Render( string);
+
+    glPopAttrib();
+}
+
+
+void FTGLTextureFont::Render( const wchar_t* string)
+{   
+    glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
+
+    glEnable(GL_BLEND);
+    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
+    
+    FTTextureGlyph::ResetActiveTexture();
+    
+    FTFont::Render( string);
+
+    glPopAttrib();
+}
+
+