/**
* Initializes the one glyph cache (texture and data structure).
* If lcdCache is JNI_TRUE, the texture will contain RGB data,
* otherwise we will simply store the grayscale/monochrome glyph images
* as intensity values (which work well with the GL_MODULATE function).
*/
static jboolean
OGLTR_InitGlyphCache(jboolean lcdCache)
{
GlyphCacheInfo *gcinfo;
GLclampf priority = 1.0f;
GLenum internalFormat = lcdCache ? GL_RGB8 : GL_INTENSITY8;
GLenum pixelFormat = lcdCache ? GL_RGB : GL_LUMINANCE;
J2dTraceLn(J2D_TRACE_INFO, "OGLTR_InitGlyphCache");
// init vertex cache (if it hasn't been already)
if (!OGLVertexCache_InitVertexCache()) {
return JNI_FALSE;
}
// init glyph cache data structure
gcinfo = AccelGlyphCache_Init(OGLTR_CACHE_WIDTH,
OGLTR_CACHE_HEIGHT,
OGLTR_CACHE_CELL_WIDTH,
OGLTR_CACHE_CELL_HEIGHT,
OGLVertexCache_FlushVertexCache);
if (gcinfo == NULL) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"OGLTR_InitGlyphCache: could not init OGL glyph cache");
return JNI_FALSE;
}
// init cache texture object
j2d_glGenTextures(1, &gcinfo->cacheID);
j2d_glBindTexture(GL_TEXTURE_2D, gcinfo->cacheID);
j2d_glPrioritizeTextures(1, &gcinfo->cacheID, &priority);
j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
j2d_glTexImage2D(GL_TEXTURE_2D, 0, internalFormat,
OGLTR_CACHE_WIDTH, OGLTR_CACHE_HEIGHT, 0,
pixelFormat, GL_UNSIGNED_BYTE, NULL);
cacheStatus = (lcdCache ? CACHE_LCD : CACHE_GRAY);
glyphCache = gcinfo;
return JNI_TRUE;
}
void
OGLTR_EnableGlyphVertexCache(OGLContext *oglc)
{
J2dTraceLn(J2D_TRACE_INFO, "OGLTR_EnableGlyphVertexCache");
if (!OGLVertexCache_InitVertexCache(oglc)) {
return;
}
if (glyphCache == NULL) {
if (!OGLTR_InitGlyphCache(JNI_FALSE)) {
return;
}
}
j2d_glEnable(GL_TEXTURE_2D);
j2d_glBindTexture(GL_TEXTURE_2D, glyphCache->cacheID);
j2d_glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
// for grayscale/monochrome text, the current OpenGL source color
// is modulated with the glyph image as part of the texture
// application stage, so we use GL_MODULATE here
OGLC_UPDATE_TEXTURE_FUNCTION(oglc, GL_MODULATE);
}
