Exemple #1
0
/**
 * 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;
}
Exemple #2
0
/**
 * Creates a 2D texture of the given format and dimensions and returns the
 * texture object identifier.  This method is typically used to create a
 * temporary texture for intermediate work, such as in the
 * OGLContext_InitBlitTileTexture() method below.
 */
GLuint
OGLContext_CreateBlitTexture(GLenum internalFormat, GLenum pixelFormat,
                             GLuint width, GLuint height)
{
    GLuint texID;
    GLint sp, sr, rl, align;
    GLclampf priority = 1.0f;

    J2dTraceLn(J2D_TRACE_INFO, "OGLContext_CreateBlitTexture");

    j2d_glGenTextures(1, &texID);
    j2d_glBindTexture(GL_TEXTURE_2D, texID);
    j2d_glPrioritizeTextures(1, &texID, &priority);
    j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    OGLSD_RESET_TEXTURE_WRAP(GL_TEXTURE_2D);

    // save pixel store parameters (since this method could be invoked after
    // the caller has already set up its pixel store parameters)
    j2d_glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &sp);
    j2d_glGetIntegerv(GL_UNPACK_SKIP_ROWS, &sr);
    j2d_glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rl);
    j2d_glGetIntegerv(GL_UNPACK_ALIGNMENT, &align);

    // set pixel store parameters to default values
    j2d_glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
    j2d_glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
    j2d_glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
    j2d_glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    j2d_glTexImage2D(GL_TEXTURE_2D, 0, internalFormat,
                     width, height, 0,
                     pixelFormat, GL_UNSIGNED_BYTE, NULL);

    // restore pixel store parameters
    j2d_glPixelStorei(GL_UNPACK_SKIP_PIXELS, sp);
    j2d_glPixelStorei(GL_UNPACK_SKIP_ROWS, sr);
    j2d_glPixelStorei(GL_UNPACK_ROW_LENGTH, rl);
    j2d_glPixelStorei(GL_UNPACK_ALIGNMENT, align);

    return texID;
}