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    <p>Change <code>GL_RGBA8</code> (which makes a grayscale image with <strong>no alpha channel</strong>) to <code>GL_INTENSITY</code>:</p> <pre><code>glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY, 16, 16, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, buffer); </code></pre> <p>The <code>GL_RGBA8</code> format, created from <code>GL_LUMINANCE</code>, gives pixels of the form <code>(Y, Y, Y, 1)</code>, but <code>GL_INTENSITY</code> with <code>GL_LUMINANCE</code> gives <code>(Y, Y, Y, Y)</code>.</p> <p>You will also want to change your blend mode to assume premultiplied alpha, e.g. change</p> <pre><code>glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); </code></pre> <p>to:</p> <pre><code>glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); </code></pre> <p><strong>Alternative:</strong></p> <p>You can also use <code>GL_ALPHA</code>, and then use your ordinary blending mode for non-premultiplied alpha:</p> <pre><code>glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 16, 16, 0, GL_ALPHA, GL_UNSIGNED_BYTE, buffer); </code></pre> <p><strong>Alternative #2:</strong></p> <p>You can keep using <code>GL_LUMINANCE</code>, and change the blending mode.</p> <pre><code>glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_COLOR); </code></pre> <p>This has the drawback that you can't color the texture without using something like <code>glBlendColor</code> (which is not part of the OpenGL headers that ship with MSVC, so you have to use GLEW or something like that):</p> <pre><code>glBlendColor(...); glBlendFunc(GL_CONSTANT_COLOR, GL_ONE_MINUS_SRC_COLOR); </code></pre> <p><strong>Alternative #3:</strong></p> <p>Use OpenGL 3, and change your fragment shader to handle single-channel textures in the desired way.</p>
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    1. POWhy is drawing an 8bit texture with OpenGL drawing black pixels instead of transparent?
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    1. USDietrich Epp
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    1. COI tried those suggestions; instead of a black box with a white X I just get a white box.
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    2. COGL_INTENSITY is not supported as texture format. That's why it's white.
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    3. CO@datenwolf: Shoot, I meant to put it in the internal format section...
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