325 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "glyph_tex");
326 j2d_glUniform1iARB(loc, 0); // texture unit 0
327 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "dst_tex");
328 j2d_glUniform1iARB(loc, 1); // texture unit 1
329
330 // "unuse" the program object; it will be re-bound later as needed
331 j2d_glUseProgramObjectARB(0);
332
333 return lcdTextProgram;
334 }
335
336 /**
337 * (Re)Initializes the gamma related uniforms.
338 *
339 * The given contrast value is an int in the range [100, 250] which we will
340 * then scale to fit in the range [1.0, 2.5].
341 */
342 static jboolean
343 OGLTR_UpdateLCDTextContrast(jint contrast)
344 {
345 double g = ((double)contrast) / 100.0;
346 double ig = 1.0 / g;
347 GLint loc;
348
349 J2dTraceLn1(J2D_TRACE_INFO,
350 "OGLTR_UpdateLCDTextContrast: contrast=%d", contrast);
351
352 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "gamma");
353 j2d_glUniform3fARB(loc, g, g, g);
354
355 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "invgamma");
356 j2d_glUniform3fARB(loc, ig, ig, ig);
357
358 return JNI_TRUE;
359 }
360
361 /**
362 * Updates the current gamma-adjusted source color ("src_adj") of the LCD
363 * text shader program. Note that we could calculate this value in the
364 * shader (e.g. just as we do for "dst_adj"), but would be unnecessary work
365 * (and a measurable performance hit, maybe around 5%) since this value is
366 * constant over the entire glyph list. So instead we just calculate the
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325 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "glyph_tex");
326 j2d_glUniform1iARB(loc, 0); // texture unit 0
327 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "dst_tex");
328 j2d_glUniform1iARB(loc, 1); // texture unit 1
329
330 // "unuse" the program object; it will be re-bound later as needed
331 j2d_glUseProgramObjectARB(0);
332
333 return lcdTextProgram;
334 }
335
336 /**
337 * (Re)Initializes the gamma related uniforms.
338 *
339 * The given contrast value is an int in the range [100, 250] which we will
340 * then scale to fit in the range [1.0, 2.5].
341 */
342 static jboolean
343 OGLTR_UpdateLCDTextContrast(jint contrast)
344 {
345 float g = ((float)contrast) / 100.0f;
346 float ig = 1.0f / g;
347 GLint loc;
348
349 J2dTraceLn1(J2D_TRACE_INFO,
350 "OGLTR_UpdateLCDTextContrast: contrast=%d", contrast);
351
352 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "gamma");
353 j2d_glUniform3fARB(loc, g, g, g);
354
355 loc = j2d_glGetUniformLocationARB(lcdTextProgram, "invgamma");
356 j2d_glUniform3fARB(loc, ig, ig, ig);
357
358 return JNI_TRUE;
359 }
360
361 /**
362 * Updates the current gamma-adjusted source color ("src_adj") of the LCD
363 * text shader program. Note that we could calculate this value in the
364 * shader (e.g. just as we do for "dst_adj"), but would be unnecessary work
365 * (and a measurable performance hit, maybe around 5%) since this value is
366 * constant over the entire glyph list. So instead we just calculate the
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