/**
* Initializes a 3D texture object for use as a three-dimensional gamma
* lookup table. Note that the wrap mode is initialized to GL_LINEAR so
* that the table will interpolate adjacent values when the index falls
* somewhere in between.
*/
static GLuint
OGLTR_InitGammaLutTexture()
{
GLuint lutTextureID;
j2d_glGenTextures(1, &lutTextureID);
j2d_glBindTexture(GL_TEXTURE_3D, lutTextureID);
j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
j2d_glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
return lutTextureID;
}
/**
* 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;
}
/**
* 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;
}
/**
* Returns JNI_TRUE only if all of the following conditions are met:
* - the GL_EXT_framebuffer_object extension is available
* - FBO support has been enabled via the system property
* - we can successfully create an FBO with depth capabilities
*/
static jboolean
OGLContext_IsFBObjectExtensionAvailable(JNIEnv *env,
const char *extString)
{
jboolean isFBObjectEnabled = JNI_FALSE;
GLuint fbobjectID, textureID, depthID;
jint width = 1, height = 1;
J2dTraceLn(J2D_TRACE_INFO, "OGLContext_IsFBObjectExtensionAvailable");
// first see if the fbobject extension is available
if (!OGLContext_IsExtensionAvailable(extString,
"GL_EXT_framebuffer_object"))
{
return JNI_FALSE;
}
// next see if the depth texture extension is available
if (!OGLContext_IsExtensionAvailable(extString,
"GL_ARB_depth_texture"))
{
return JNI_FALSE;
}
// next see if the fbobject system property has been enabled
isFBObjectEnabled =
JNU_GetStaticFieldByName(env, NULL,
"sun/java2d/opengl/OGLSurfaceData",
"isFBObjectEnabled", "Z").z;
if (!isFBObjectEnabled) {
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsFBObjectExtensionAvailable: disabled via flag");
return JNI_FALSE;
}
// finally, create a dummy fbobject with depth capabilities to see
// if this configuration is supported by the drivers/hardware
// (first we initialize a color texture object that will be used to
// construct the dummy fbobject)
j2d_glGenTextures(1, &textureID);
j2d_glBindTexture(GL_TEXTURE_2D, textureID);
j2d_glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB,
width, height, 0,
GL_RGB, GL_UNSIGNED_BYTE, NULL);
j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
j2d_glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
// initialize framebuffer object using color texture created above
if (!OGLSD_InitFBObject(&fbobjectID, &depthID,
textureID, GL_TEXTURE_2D,
width, height))
{
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsFBObjectExtensionAvailable: fbobject unsupported");
j2d_glDeleteTextures(1, &textureID);
return JNI_FALSE;
}
// delete the temporary resources
j2d_glDeleteTextures(1, &textureID);
j2d_glDeleteRenderbuffersEXT(1, &depthID);
j2d_glDeleteFramebuffersEXT(1, &fbobjectID);
J2dRlsTraceLn(J2D_TRACE_INFO,
"OGLContext_IsFBObjectExtensionAvailable: fbobject supported");
return JNI_TRUE;
}