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authorDavid Thompson <dthompson2@worcester.edu>2021-10-07 20:17:50 -0400
committerDavid Thompson <dthompson2@worcester.edu>2021-10-07 20:17:50 -0400
commit0e699be281c8dea53e589e08a5831837e0eae7ea (patch)
tree4266aebec927b13ca56410be1901e3ee78dff49e /manuals/chickadee/Blending.html
parent38daa330f2194de5f39cd41b270c89d7b2e94427 (diff)
Updates for Chickadee 0.8.0 and Guile-SDL2 0.7.0.
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-<!-- Copyright (C) 2017-2020 David Thompson davet@gnu.org
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-or any later version published by the Free Software Foundation;
-with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
-A copy of the license is included in the section entitled "GNU
-Free Documentation License".
-
-A copy of the license is also available from the Free Software
-Foundation Web site at http://www.gnu.org/licenses/fdl.html.
-
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-* Chickadee: (chickadee). Game programming toolkit for Guile.
-
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-<title>Blending (The Chickadee Game Toolkit)</title>
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-<link href="Graphics.html" rel="up" title="Graphics">
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-<body lang="en">
-<span id="Blending"></span><div class="header">
-<p>
-Next: <a href="Framebuffers.html" accesskey="n" rel="next">Framebuffers</a>, Previous: <a href="3D-Models.html" accesskey="p" rel="prev">3D Models</a>, Up: <a href="Graphics.html" accesskey="u" rel="up">Graphics</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
-</div>
-<hr>
-<span id="Blending-1"></span><h4 class="subsection">2.3.10 Blending</h4>
-
-<p>Rendering a scene often involves drawing layers of objects that
-overlap each other. Blending determines how two overlapping pixels
-are combined in the final image that is rendered to the screen.
-</p>
-<p>Chickadee provides the following blend modes:
-</p>
-<dl>
-<dt id="index-blend_003aalpha">Variable: <strong>blend:alpha</strong></dt>
-<dd><p>Blend pixels according to the values of their alpha channels. This is
-the most commonly used blend mode.
-</p></dd></dl>
-
-<dl>
-<dt id="index-blend_003areplace">Variable: <strong>blend:replace</strong></dt>
-<dd><p>Overwrite the output pixel color with the color being drawn.
-</p></dd></dl>
-
-<dl>
-<dt id="index-blend_003aadd">Variable: <strong>blend:add</strong></dt>
-<dd><p>Add all pixel color values together. The more colors blended
-together, the more white the final color becomes.
-</p></dd></dl>
-
-<dl>
-<dt id="index-blend_003asubtract">Variable: <strong>blend:subtract</strong></dt>
-<dd><p>Subtract all pixel color values. The more colors blended together,
-the more black the final color becomes.
-</p></dd></dl>
-
-<dl>
-<dt id="index-blend_003amultiply">Variable: <strong>blend:multiply</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-blend_003adarken">Variable: <strong>blend:darken</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-blend_003alighten">Variable: <strong>blend:lighten</strong></dt>
-</dl>
-
-<dl>
-<dt id="index-blend_003ascreen">Variable: <strong>blend:screen</strong></dt>
-</dl>
-
-<p>Custom blend modes can be created using the <code>make-blend-mode</code> procedure:
-</p>
-<dl>
-<dt id="index-make_002dblend_002dmode">Procedure: <strong>make-blend-mode</strong> <em>equation source-function destination-function</em></dt>
-<dd><p>Return a new custom blend mode that applies <var>source-function</var> to
-the source color, <var>destination-function</var> to the destination color,
-and finally applies <var>equation</var> to the transformed
-source/destination color values. These arguments are <em>not</em>
-procedures, but symbolic representations of the functions that OpenGL
-supports.
-</p>
-<p>Valid values for <var>equation</var> are:
-</p>
-<ul>
-<li> <code>add</code>
-</li><li> <code>subtract</code>
-</li><li> <code>reverse-subtract</code>
-</li><li> <code>min</code>
-</li><li> <code>max</code>
-</li><li> <code>alpha-min</code>
-</li><li> <code>alpha-max</code>
-</li></ul>
-
-<p>Valid values for <var>source-function</var> are:
-</p>
-<ul>
-<li> <code>zero</code>
-</li><li> <code>one</code>
-</li><li> <code>destination-color</code>
-</li><li> <code>one-minus-destination-color</code>
-</li><li> <code>source-alpha-saturate</code>
-</li><li> <code>source-alpha</code>
-</li><li> <code>one-minus-source-alpha</code>
-</li><li> <code>destination-alpha</code>
-</li><li> <code>one-minus-destination-alpha</code>
-</li><li> <code>constant-color</code>
-</li><li> <code>one-minus-constant-color</code>
-</li><li> <code>constant-alpha</code>
-</li><li> <code>one-minus-constant-alpha</code>
-</li></ul>
-
-<p>Valid values for <var>destination-function</var> are:
-</p>
-<ul>
-<li> <code>zero</code>
-</li><li> <code>one</code>
-</li><li> <code>source-color</code>
-</li><li> <code>one-minus-source-color</code>
-</li><li> <code>source-alpha</code>
-</li><li> <code>one-minus-source-alpha</code>
-</li><li> <code>destination-alpha</code>
-</li><li> <code>one-minus-destination-alpha</code>
-</li><li> <code>constant-color</code>
-</li><li> <code>one-minus-constant-color</code>
-</li><li> <code>constant-alpha</code>
-</li><li> <code>one-minus-constant-alpha</code>
-</li></ul>
-
-</dd></dl>
-
-<hr>
-<div class="header">
-<p>
-Next: <a href="Framebuffers.html" accesskey="n" rel="next">Framebuffers</a>, Previous: <a href="3D-Models.html" accesskey="p" rel="prev">3D Models</a>, Up: <a href="Graphics.html" accesskey="u" rel="up">Graphics</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
-</div>
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