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1 files changed, 267 insertions, 0 deletions

diff --git a/src/ftgl/FTFont/FTTextureFont.cpp b/src/ftgl/FTFont/FTTextureFont.cpp
new file mode 100644
index 0000000..4e385ea
--- /dev/null
+++ b/src/ftgl/FTFont/FTTextureFont.cpp
@@ -0,0 +1,267 @@
+/*
+ * FTGL - OpenGL font library
+ *
+ * Copyright (c) 2001-2004 Henry Maddocks <ftgl@opengl.geek.nz>
+ * Copyright (c) 2008 Sam Hocevar <sam@zoy.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <cassert>
+#include <string> // For memset
+
+#include "FTGL/ftgl.h"
+
+#include "FTInternals.h"
+
+#include "../FTGlyph/FTTextureGlyphImpl.h"
+#include "./FTTextureFontImpl.h"
+
+
+//
+//  FTTextureFont
+//
+
+
+FTTextureFont::FTTextureFont(char const *fontFilePath) :
+    FTFont(new FTTextureFontImpl(this, fontFilePath))
+{}
+
+
+FTTextureFont::FTTextureFont(const unsigned char *pBufferBytes,
+                             size_t bufferSizeInBytes) :
+    FTFont(new FTTextureFontImpl(this, pBufferBytes, bufferSizeInBytes))
+{}
+
+
+FTTextureFont::~FTTextureFont()
+{}
+
+
+FTGlyph* FTTextureFont::MakeGlyph(FT_GlyphSlot ftGlyph)
+{
+    FTTextureFontImpl *myimpl = dynamic_cast<FTTextureFontImpl *>(impl);
+    if(!myimpl)
+    {
+        return NULL;
+    }
+
+    return myimpl->MakeGlyphImpl(ftGlyph);
+}
+
+
+//
+//  FTTextureFontImpl
+//
+
+
+static 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;
+}
+
+
+FTTextureFontImpl::FTTextureFontImpl(FTFont *ftFont, const char* fontFilePath)
+:   FTFontImpl(ftFont, fontFilePath),
+    maximumGLTextureSize(0),
+    textureWidth(0),
+    textureHeight(0),
+    glyphHeight(0),
+    glyphWidth(0),
+    padding(3),
+    xOffset(0),
+    yOffset(0)
+{
+    load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
+    remGlyphs = numGlyphs = face.GlyphCount();
+}
+
+
+FTTextureFontImpl::FTTextureFontImpl(FTFont *ftFont,
+                                     const unsigned char *pBufferBytes,
+                                     size_t bufferSizeInBytes)
+:   FTFontImpl(ftFont, pBufferBytes, bufferSizeInBytes),
+    maximumGLTextureSize(0),
+    textureWidth(0),
+    textureHeight(0),
+    glyphHeight(0),
+    glyphWidth(0),
+    padding(3),
+    xOffset(0),
+    yOffset(0)
+{
+    load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP;
+    remGlyphs = numGlyphs = face.GlyphCount();
+}
+
+
+FTTextureFontImpl::~FTTextureFontImpl()
+{
+    if(textureIDList.size())
+    {
+        glDeleteTextures((GLsizei)textureIDList.size(),
+                         (const GLuint*)&textureIDList[0]);
+    }
+}
+
+
+FTGlyph* FTTextureFontImpl::MakeGlyphImpl(FT_GlyphSlot ftGlyph)
+{
+    glyphHeight = static_cast<int>(charSize.Height() + 0.5);
+    glyphWidth = static_cast<int>(charSize.Width() + 0.5);
+
+    if(glyphHeight < 1) glyphHeight = 1;
+    if(glyphWidth < 1) glyphWidth = 1;
+
+    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().Upper().X() - tempGlyph->BBox().Lower().X() + padding + 0.5);
+
+    --remGlyphs;
+
+    return tempGlyph;
+}
+
+
+void FTTextureFontImpl::CalculateTextureSize()
+{
+    if(!maximumGLTextureSize)
+    {
+        maximumGLTextureSize = 1024;
+        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 + 0.5);
+
+    textureHeight = NextPowerOf2(((numGlyphs / h) + 1) * glyphHeight);
+    textureHeight = textureHeight > maximumGLTextureSize ? maximumGLTextureSize : textureHeight;
+}
+
+
+GLuint FTTextureFontImpl::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 FTTextureFontImpl::FaceSize(const unsigned int size, const unsigned int res)
+{
+    if(!textureIDList.empty())
+    {
+        glDeleteTextures((GLsizei)textureIDList.size(), (const GLuint*)&textureIDList[0]);
+        textureIDList.clear();
+        remGlyphs = numGlyphs = face.GlyphCount();
+    }
+
+    return FTFontImpl::FaceSize(size, res);
+}
+
+
+template <typename T>
+inline FTPoint FTTextureFontImpl::RenderI(const T* string, const int len,
+                                          FTPoint position, FTPoint spacing,
+                                          int renderMode)
+{
+    // Protect GL_TEXTURE_2D, GL_BLEND and blending functions
+    glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
+
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
+
+    glEnable(GL_TEXTURE_2D);
+
+    FTTextureGlyphImpl::ResetActiveTexture();
+
+    FTPoint tmp = FTFontImpl::Render(string, len,
+                                     position, spacing, renderMode);
+
+    glPopAttrib();
+
+    return tmp;
+}
+
+
+FTPoint FTTextureFontImpl::Render(const char * string, const int len,
+                                  FTPoint position, FTPoint spacing,
+                                  int renderMode)
+{
+    return RenderI(string, len, position, spacing, renderMode);
+}
+
+
+FTPoint FTTextureFontImpl::Render(const wchar_t * string, const int len,
+                                  FTPoint position, FTPoint spacing,
+                                  int renderMode)
+{
+    return RenderI(string, len, position, spacing, renderMode);
+}
+