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POOpenglES blending particles but not background
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  1. POOpenglES blending particles but not background
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    copied!<p>I have the next process:</p> <pre><code> - draw background - draw objects and blend with background (1)GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA - draw particle effect with blending (2)GL10.GL_SRC_ALPHA, GL10.GL_ONE in order to highlight overlapping particles </code></pre> <p>Problem - when I draw particle they are additionally blended with background and becomes very bright. </p> <p>Simply what I need is to blend particles with (2) and than all together to blend with background using (1).</p> <p>Not working solutions: </p> <ul> <li>Drawing effect to a texture and than applying it works fine...but extremely slow. </li> <li>Drawing particle effect first and than background, it look ok...but I can not draw scene object than because they need to be between bg and effect</li> </ul> <p>Here is screen to show the difference. On the right desired result, on the left particles are blended with background.</p> <p>img: </p> <p><img src="https://i.stack.imgur.com/h5K3K.png" alt="enter image description here"></p> <p>I will appreciate any help...</p> <p><strong>Latest Updates:</strong> I was able to get the color I want...but... (Seems this way will move me nowhere) I have rendered background with alpha = 0 and than use blend Function from GL11Ext: glBlendFuncSeparate(GL10.GL_SRC_ALPHA, GL10.GL_DST_ALPHA, GL10.GL_ONE, GL10.GL_ONE);</p> <p>GL10.GL_SRC_ALPHA, GL10.GL_DST_ALPHA - the colors are blended only if they have alpha(bg dont have now)</p> <p>GL10.GL_ONE, GL10.GL_ONE - alpha is set to maximum for all written particles to simulate additive blending</p> <p><img src="https://i.stack.imgur.com/hN1Yn.png" alt="enter image description here"></p> <p>It works fine as you can see...except the black color filling area where particles image has alpha 0..and whats bad that in result image that black color has alpha 1 so I can not replace it in any way...</p> <p><strong>EDIT_2</strong> General problem in simple words: I need to draw a red(0xff0000) glowing(additive blending) effect. On black background it is ok, but if I would take green(0x00ff00) than the result color would be close to 0xffff00</p> <p>Any ideas?</p>
 

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