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| author | David Thompson <dthompson@vistahigherlearning.com> | 2019-06-04 20:49:16 -0400 |
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| committer | David Thompson <dthompson@vistahigherlearning.com> | 2019-06-04 20:49:16 -0400 |
| commit | 279f17ac0e1b3d019c2b294098e834d249376686 (patch) | |
| tree | 47be849d3b35635d167e00cd8448815a75167a23 /manuals/chickadee/Blending.html | |
| parent | 7b808b9268ec735a7a176d10bf1887b3fa66d13e (diff) | |
Update chickadee manual.
Diffstat (limited to 'manuals/chickadee/Blending.html')
| -rw-r--r-- | manuals/chickadee/Blending.html | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/manuals/chickadee/Blending.html b/manuals/chickadee/Blending.html new file mode 100644 index 0000000..6b3aa0d --- /dev/null +++ b/manuals/chickadee/Blending.html @@ -0,0 +1,137 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 2017, 2018, 2019 David Thompson davet@gnu.org + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 +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. + + +* Chickadee: (chickadee). Game programming toolkit for Guile. + +The document was typeset with +http://www.texinfo.org/ (GNU Texinfo). + --> +<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<title>Blending (The Chickadee Game Toolkit)</title> + +<meta name="description" content="Blending (The Chickadee Game Toolkit)"> +<meta name="keywords" content="Blending (The Chickadee Game Toolkit)"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Index.html#Index" rel="index" title="Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Graphics.html#Graphics" rel="up" title="Graphics"> +<link href="Framebuffers.html#Framebuffers" rel="next" title="Framebuffers"> +<link href="Particles.html#Particles" rel="prev" title="Particles"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.indentedblock {margin-right: 0em} +blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smalllisp {margin-left: 3.2em} +kbd {font-style: oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nolinebreak {white-space: nowrap} +span.roman {font-family: initial; font-weight: normal} +span.sansserif {font-family: sans-serif; font-weight: normal} +ul.no-bullet {list-style: none} +@media (min-width: 1140px) { + body { + margin-left: 14rem; + margin-right: 4rem; + max-width: 52rem; + } +} + +@media (min-width: 800px) and (max-width: 1140px) { + body { + margin-left: 6rem; + margin-right: 4rem; + max-width: 52rem; + } +} + +@media (max-width: 800px) { + body { + margin: 1rem; + } +} + +--> +</style> +<link rel="stylesheet" type="text/css" href="https://dthompson.us/css/dthompson.css"> + + +</head> + +<body lang="en"> +<a name="Blending"></a> +<div class="header"> +<p> +Next: <a href="Framebuffers.html#Framebuffers" accesskey="n" rel="next">Framebuffers</a>, Previous: <a href="Particles.html#Particles" accesskey="p" rel="prev">Particles</a>, Up: <a href="Graphics.html#Graphics" accesskey="u" rel="up">Graphics</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Blending-1"></a> +<h4 class="subsection">2.3.7 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. +Chickadee provides the following blend modes: +</p> +<ul> +<li> <code>replace</code> +Use the latest color, ignoring all others. + +</li><li> <code>alpha</code> +Blend pixels according to the values of their alpha channels. This is +the most commonly used blend mode and thus is Chickadee’s default +mode. + +</li><li> <code>add</code> +Add all pixel color values together. The more colors blended +together, the more white the final color becomes. + +</li><li> <code>subtract</code> +Subtract all pixel color values. The more colors blended together, +the more black the final color becomes. + +</li><li> <code>multiply</code> + +</li><li> <code>darken</code> + +</li><li> <code>lighten</code> + +</li><li> <code>screen</code> + +</li></ul> + + + + +</body> +</html> |