GRK/cw 5/zadania 5.html

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2022-01-12 16:07:16 +01:00
<!doctype html>
<html>
<head>
<meta charset='UTF-8'><meta name='viewport' content='width=device-width initial-scale=1'>
<link href='https://fonts.loli.net/css?family=Open+Sans:400italic,700italic,700,400&subset=latin,latin-ext' rel='stylesheet' type='text/css' /><style type='text/css'>html {overflow-x: initial !important;}:root { --bg-color:#ffffff; --text-color:#333333; --select-text-bg-color:#B5D6FC; --select-text-font-color:auto; --monospace:"Lucida Console",Consolas,"Courier",monospace; --title-bar-height:20px; }
.mac-os-11 { --title-bar-height:28px; }
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body { margin: 0px; padding: 0px; height: auto; inset: 0px; font-size: 1rem; line-height: 1.42857; overflow-x: hidden; background: inherit; tab-size: 4; }
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video { max-width: 100%; display: block; margin: 0px auto; }
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/* open-sans-regular - latin-ext_latin */
/* open-sans-italic - latin-ext_latin */
/* open-sans-700 - latin-ext_latin */
/* open-sans-700italic - latin-ext_latin */
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font-size: 16px;
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}
body {
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background-color: #fafafa;
}
.ty-preferences .nav-group-item.active {
color: white;
background: #999;
}
.menu-item-container a.menu-style-btn {
background-color: #f5f8fa;
background-image: linear-gradient( 180deg , hsla(0, 0%, 100%, 0.8), hsla(0, 0%, 100%, 0));
}
mjx-container[jax="SVG"] {
direction: ltr;
}
mjx-container[jax="SVG"] > svg {
overflow: visible;
min-height: 1px;
min-width: 1px;
}
mjx-container[jax="SVG"] > svg a {
fill: blue;
stroke: blue;
}
mjx-assistive-mml {
position: absolute !important;
top: 0px;
left: 0px;
clip: rect(1px, 1px, 1px, 1px);
padding: 1px 0px 0px 0px !important;
border: 0px !important;
display: block !important;
width: auto !important;
overflow: hidden !important;
-webkit-touch-callout: none;
-webkit-user-select: none;
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
mjx-assistive-mml[display="block"] {
width: 100% !important;
}
mjx-container[jax="SVG"][display="true"] {
display: block;
text-align: center;
margin: 1em 0;
}
mjx-container[jax="SVG"][display="true"][width="full"] {
display: flex;
}
mjx-container[jax="SVG"][justify="left"] {
text-align: left;
}
mjx-container[jax="SVG"][justify="right"] {
text-align: right;
}
g[data-mml-node="merror"] > g {
fill: red;
stroke: red;
}
g[data-mml-node="merror"] > rect[data-background] {
fill: yellow;
stroke: none;
}
g[data-mml-node="mtable"] > line[data-line], svg[data-table] > g > line[data-line] {
stroke-width: 70px;
fill: none;
}
g[data-mml-node="mtable"] > rect[data-frame], svg[data-table] > g > rect[data-frame] {
stroke-width: 70px;
fill: none;
}
g[data-mml-node="mtable"] > .mjx-dashed, svg[data-table] > g > .mjx-dashed {
stroke-dasharray: 140;
}
g[data-mml-node="mtable"] > .mjx-dotted, svg[data-table] > g > .mjx-dotted {
stroke-linecap: round;
stroke-dasharray: 0,140;
}
g[data-mml-node="mtable"] > g > svg {
overflow: visible;
}
[jax="SVG"] mjx-tool {
display: inline-block;
position: relative;
width: 0;
height: 0;
}
[jax="SVG"] mjx-tool > mjx-tip {
position: absolute;
top: 0;
left: 0;
}
mjx-tool > mjx-tip {
display: inline-block;
padding: .2em;
border: 1px solid #888;
font-size: 70%;
background-color: #F8F8F8;
color: black;
box-shadow: 2px 2px 5px #AAAAAA;
}
g[data-mml-node="maction"][data-toggle] {
cursor: pointer;
}
mjx-status {
display: block;
position: fixed;
left: 1em;
bottom: 1em;
min-width: 25%;
padding: .2em .4em;
border: 1px solid #888;
font-size: 90%;
background-color: #F8F8F8;
color: black;
}
foreignObject[data-mjx-xml] {
font-family: initial;
line-height: normal;
overflow: visible;
}
mjx-container[jax="SVG"] path[data-c], mjx-container[jax="SVG"] use[data-c] {
stroke-width: 3;
}
g[data-mml-node="xypic"] path {
stroke-width: inherit;
}
.MathJax g[data-mml-node="xypic"] path {
stroke-width: inherit;
}
:root {--mermaid-font-zoom:1.5em ;}
</style><title>zadania 5</title>
</head>
<body class='typora-export os-windows'><div class='typora-export-content'>
<div id='write' class=''><h1 id='ii-teksturowanie'><span>II Teksturowanie</span></h1><h3 id='ii0-obejrzyj-plik-textureh-aby-zapoznać-się-z-nowym-interfejsem-do-obsługi-tekstur'><span>II.0 Obejrzyj plik </span><strong><span>Texture.h</span></strong><span> aby zapoznać się z nowym interfejsem do obsługi tekstur.</span></h3><h3 id='ii1-przygotuj-shadery-i-załaduj-teksturę'><span>II.1 Przygotuj shadery i załaduj teksturę:</span></h3><p><span>a) W kolejnych zadaniach będziemy potrzebować trzecią parę shaderów: </span><strong><span>shader_4_tex.vert</span></strong><span> i </span><strong><span>shader_4_tex.frag</span></strong><span> są one gotowymi shaderami z poprzednich zadań. </span></p><ul><li><span>Wczytaj shadery i przechowaj adres programu pod zmienną globalną </span><code>programTex</code><span> (tzn. powtórz dla nich punkt 6.a, ale zamiast </span><code>programSun</code><span> nazwij zmienną </span><code>programTex</code><span>).</span></li><li><span>Prześlij globalne </span><em><span>uniformy</span></em><span> do </span><code>programTex</code><span>.</span></li></ul><p><span>b) ładowanie tekstury:</span></p><ul><li><span>Pod </span><code>namespace texture</code><span> znajdują się zmienne globalne typu </span><code>Gluint</code><span>, które będą przechowywać adresy tekstur. W funkcji </span><code>init()</code><span> załaduj tekstury z folderu </span><strong><span>textures</span></strong><span> przy pomocy </span><code>Core::LoadTexture</code><span>. Ta funkcja zwraca adres do wczytanej tekstury, przypisz je do zmiennych z </span><code>namespace texture</code><span>. </span></li><li><span>(odwołanie się do </span><code>namespace</code><span> wykonuje się za pomocą ::, czyli by odwołać się do </span><code>grid</code><span> w </span><code>namespace</code><span> </span><code>texture</code><span> należy napisać </span><code>texture::grid</code><span>)</span></li></ul><h3 id='ii2-stwórz-funkcje-odpowiadająca-za-rysowanie-teksturowanych-obiektów'><span>II.2. Stwórz funkcje odpowiadająca za rysowanie teksturowanych obiektów:</span></h3><ul><li><span>Skopiuj funkcję </span><code>drawObject</code><span>. Nazwij kopię </span><code>drawObjectTexture()</code><span> i zmodyfikują ją tak, aby przyjmowała jako parametr identyfikator tekstury, a nie wektor koloru. (Usuń w niej linijkę odpowiadającą za przesyłanie koloru, żeby uniknąć błędu komunikacji, później dodamy na jej miejsce ładowanie tekstury).</span></li></ul><p>&nbsp;</p><h3 id='ii3-zmodyfikuj-shader-tak-aby-nakładał-teksturę-na-obiekt'><span>II.3. Zmodyfikuj shader tak, aby nakładał teksturę na obiekt:</span></h3><p><span>a) Narysuj jedną z planet za pomocą </span><code>drawObjectTexture()</code><span>, użyj </span><code>programTex</code><span> jako programu.</span></p><p><span>b) Prześlij współrzędne mapowania tekstur z </span><em><span>vertex shadera</span></em><span> do </span><em><span>fragment shadera</span></em></p><ul><li><span>Współrzędne tekstur to kolejny (po pozycjach i wektorach normalnych) atrybut wierzchołków - są dostępne w </span><em><span>vertex shaderze</span></em><span> pod nazwą </span><code>vertexTexCoord</code></li><li><span>Prześlij je znanym już sposobem do </span><em><span>fragment shadera</span></em><span> (zmienna </span><code>out</code><span> w </span><em><span>vertex shaderze</span></em><span> i odpowiadająca jej zmienna </span><code>in</code><span> we </span><em><span>fragment shaderze</span></em><span>)</span></li></ul><p><span>c) Prześlij teksturę do fragment shadera:</span></p><ul><li><span>Stwórz zmienną typu </span><code>uniform sampler2D</code><span> (nazwij ją na przykład </span><code>colorTexture</code><span>) we fragment shaderze - analogicznie do innych zmiennych typu uniform, służy ona do przesyłania informacji bezpośrednio z kodu C++ do shadera</span></li><li><span>Po stronie kodu C++ użyj funkcji </span><code>Core::SetActiveTexture</code><span> wewnątrz </span><code>drawObjectTexture()</code><span> aby ustawić zmienną </span><
<span>Na koniec warto jeszcze znormalizować wektor normalny, aby uniknąć błędów związanych z precyzja lub kompresja tekstury.</span></li><li><span>Wczytaj pliki zawierające mapy normalnych w kodzie C++ W tym celu załaduj przy użyciu funkcji </span><code>Core::LoadTexture</code><span> mapy normalnych dla wszystkich modeli. Maja one taką sama nazwę jak zwykle tekstury, tyle ze z suffiksem &quot;_normals&quot;.</span></li><li><span>Zmodyfikuj na koniec funkcje </span><code>drawObjectTexture</code><span>. Dodaj do niej nowy argument </span><code>GLuint normalmapId</code><span>, który będzie służył do przekazywania id tekstury zawierającej mapę normalnych. Przy użyciu funkcji </span><code>Core::SetActiveTexture</code><span> załaduj </span><code>normalmapId</code><span> jako </span><code>normalSampler</code><span> i ustaw jednostkę teksturowania nr 1.</span>
<span>Argument odpowiadający za normalne w w miejscach wywołania funkcji </span><code>drawObjectTexture</code><span>.</span></li></ol><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p></div></div>
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