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POOpenGL glBlendFuncSeparate
 

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    <p>I need some help with OpenGL textures masking. I have it working but need to find some other blending function parameters to work in other way. Now I have:</p> <pre><code>//Background ...code... glBlendFunc(GL_ONE, GL_ZERO); ...code //Mask ...code... glBlendFuncSeparate(GL_ZERO, GL_ONE, GL_DST_COLOR, GL_ZERO); ...code... //Foreground ...code glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA); ...code </code></pre> <p>Now it sets foreground's opacity to 0 (fills with background texture) where mask is transparent. I need it to react to mask's colors. I mean something like setting foregrounds opacity depending on mask's color. For example if mask is black (0.0,0.0,0.0) then the opacity of that place in foreground is 0 (is filled with background), and if mask is white (1.0,1.0,1.0) then the opacity of foreground is 1 (not filled with background). It can be in reverse consequence (white = opacity 0, black = opacity 1). I just need it to work depending on color.</p> <p>My current result's visualization bellow.</p> <hr> <p>Background:<br> <img src="https://i.stack.imgur.com/hJIWh.png" alt="enter image description here"></p> <p>Mask (circle is transparent):<br> <img src="https://i.stack.imgur.com/ELd1J.png" alt="enter image description here"></p> <p>Foreground:<br> <img src="https://i.stack.imgur.com/pMEWt.png" alt="enter image description here"></p> <p>Result:<br> <img src="https://i.stack.imgur.com/bI1Eb.png" alt="enter image description here"></p> <hr> <p>And I want it to work like this:</p> <p>Background:<br> <img src="https://i.stack.imgur.com/hJIWh.png" alt="enter image description here"></p> <p>Mask (circle is white, background is black):<br> <img src="https://i.stack.imgur.com/ELd1J.png" alt="enter image description here"></p> <p>Foreground:<br> <img src="https://i.stack.imgur.com/pMEWt.png" alt="enter image description here"></p> <p>Result:<br> <img src="https://i.stack.imgur.com/bI1Eb.png" alt="enter image description here"></p> <hr> <p>So that later it could be used like this:</p> <p>Background:<br> <img src="https://i.stack.imgur.com/hJIWh.png" alt="enter image description here"></p> <p>Mask (circle is white, background is black):<br> <img src="https://i.stack.imgur.com/M8vaz.png" alt="enter image description here"></p> <p>Foreground:<br> <img src="https://i.stack.imgur.com/pMEWt.png" alt="enter image description here"></p> <p>Result:<br> <img src="https://i.stack.imgur.com/qJGnM.png" alt="enter image description here"></p> <hr> <p>Attempt with @Gigi solution:<br> <img src="https://i.stack.imgur.com/4bIXc.png" alt="enter image description here"></p>
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    1. COCould you add an "expected" result image as well?
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    2. COQuestion edited
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    3. COHave you considered using a pixel shader?
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