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POiOs OpenGL ES 2.0 blending with shader on device and on simulator
 

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  1. POiOs OpenGL ES 2.0 blending with shader on device and on simulator
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    <p>Here is the fragment of fragment shader code (I need make blending in the shader):</p> <pre><code>float a = texture2D(tMask, texCoords).x; // opacity of current pixel from mask texture. if ( a == 0.0) discard; else { vec4 dst_clr = texture2D(tBkgText, posCoords); // color of current pixel in current framebuffer. vec4 src_clr = vec4(vColor.rgb, sOpacity); gl_FragColor = src_clr * a + dst_clr * (1.0 - a); } </code></pre> <p>Here are the blending function and equation:</p> <pre><code>glBlendFunc(GL_ONE, GL_ZERO); glBlendEquation(GL_FUNC_ADD); </code></pre> <p>And here are results on device (left) and on simulator (right):</p> <p><img src="https://i.stack.imgur.com/bzVwq.png" alt="on device"> <img src="https://i.stack.imgur.com/1EhWe.png" alt="on simulator"></p> <p>How to make so that it works like on an emulator?</p> <p><strong>UPDATE:</strong></p> <p>I've removed <code>discard</code>:</p> <pre><code>float a = texture2D(tMask, texCoords).x; // opacity of current pixel from mask texture. vec4 dst_clr = texture2D(tBkgText, posCoords); // color of current pixel in current framebuffer. vec4 src_clr = vec4(vColor.rgb, sOpacity); gl_FragColor = src_clr * a + dst_clr * (1.0 - a); </code></pre> <p>Now result on the device looks like:</p> <p><img src="https://i.stack.imgur.com/KvLQb.jpg" alt="on device without &quot;discard&quot;"></p>
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    1. USGeorge
    1. USGeorge
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    1. COIs blending enabled? Also, `discard()` can be really expensive on iOS devices, as can an `if()` statement, so you might be better off removing that condition and just always passing the alpha value through to your calculations, even if it is 0.
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      1. USBrad Larson
    2. COYes, of course, blending is enabled. You can see this on the simulator example.
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      1. USGeorge
 

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