/**
* Enables the LCD text shader and updates any related state, such as the
* gamma lookup table textures.
*/
static jboolean
OGLTR_EnableLCDGlyphModeState(GLuint glyphTextureID, jint contrast)
{
// bind the texture containing glyph data to texture unit 0
j2d_glActiveTextureARB(GL_TEXTURE0_ARB);
j2d_glBindTexture(GL_TEXTURE_2D, glyphTextureID);
// bind the texture tile containing destination data to texture unit 1
j2d_glActiveTextureARB(GL_TEXTURE1_ARB);
if (cachedDestTextureID == 0) {
cachedDestTextureID =
OGLContext_CreateBlitTexture(GL_RGB8, GL_RGB,
OGLTR_CACHED_DEST_WIDTH,
OGLTR_CACHED_DEST_HEIGHT);
if (cachedDestTextureID == 0) {
return JNI_FALSE;
}
}
j2d_glBindTexture(GL_TEXTURE_2D, cachedDestTextureID);
// note that GL_TEXTURE_2D was already enabled for texture unit 0,
// but we need to explicitly enable it for texture unit 1
j2d_glEnable(GL_TEXTURE_2D);
// create the LCD text shader, if necessary
if (lcdTextProgram == 0) {
lcdTextProgram = OGLTR_CreateLCDTextProgram();
if (lcdTextProgram == 0) {
return JNI_FALSE;
}
}
// enable the LCD text shader
j2d_glUseProgramObjectARB(lcdTextProgram);
// update the current contrast settings, if necessary
if (lastLCDContrast != contrast) {
if (!OGLTR_UpdateLCDTextContrast(contrast)) {
return JNI_FALSE;
}
lastLCDContrast = contrast;
}
// update the current color settings
if (!OGLTR_UpdateLCDTextColor(contrast)) {
return JNI_FALSE;
}
// bind the gamma LUT textures
j2d_glActiveTextureARB(GL_TEXTURE2_ARB);
j2d_glBindTexture(GL_TEXTURE_3D, invGammaLutTextureID);
j2d_glEnable(GL_TEXTURE_3D);
j2d_glActiveTextureARB(GL_TEXTURE3_ARB);
j2d_glBindTexture(GL_TEXTURE_3D, gammaLutTextureID);
j2d_glEnable(GL_TEXTURE_3D);
return JNI_TRUE;
}
/**
* Initializes a small texture tile for use with tiled blit operations (see
* OGLBlitLoops.c and OGLMaskBlit.c for usage examples). The texture ID for
* the tile is stored in the given OGLContext. The tile is initially filled
* with garbage values, but the tile is updated as needed (via
* glTexSubImage2D()) with real RGBA values used in tiled blit situations.
* The internal format for the texture is GL_RGBA8, which should be sufficient
* for storing system memory surfaces of any known format (see PixelFormats
* for a list of compatible surface formats).
*/
jboolean
OGLContext_InitBlitTileTexture(OGLContext *oglc)
{
J2dTraceLn(J2D_TRACE_INFO, "OGLContext_InitBlitTileTexture");
oglc->blitTextureID =
OGLContext_CreateBlitTexture(GL_RGBA8, GL_RGBA,
OGLC_BLIT_TILE_SIZE,
OGLC_BLIT_TILE_SIZE);
return JNI_TRUE;
}
