{"id":453,"date":"2007-08-27T14:10:00","date_gmt":"2007-08-27T14:10:00","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=453"},"modified":"2017-01-29T11:14:17","modified_gmt":"2017-01-29T02:14:17","slug":"opengl-shader-14","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=453","title":{"rendered":"OpenGL Shader &#8211; 14"},"content":{"rendered":"<p><strong>GLSL\uc5d0\uc11c\uc758 \ub370\uc774\ud130 \ud0c0\uc785\uacfc \ubcc0\uc218<\/strong><br \/>\n\uc6d0\ubb38 : <a href=\"http:\/\/www.lighthouse3d.com\/opengl\/glsl\/index.php?data\">http:\/\/www.lighthouse3d.com\/opengl\/glsl\/index.php?data<\/a><\/p>\n<p><strong>\ud0c0\uc785(Type)<\/strong><\/p>\n<p>GLSL\uc5d0\uc11c \uc0ac\uc6a9\uac00\ub2a5\ud55c \uac04\ub2e8\ud55c \ub370\uc774\ud130 \ud0c0\uc785\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n<ul>\n<li>float<\/li>\n<li>bool<\/li>\n<li>int<\/li>\n<\/ul>\n<p>float\uc640 int\ub294 C\uc5b8\uc5b4\uc640 \ub3d9\uc77c\ud558\uba70 bool\uc740 true\uc640 false \uac12\uc744 \ucde8\ud55c\ub2e4.<\/p>\n<p>2, 3 \ub610\ub294 4\uac1c\uc758 \uc694\uc18c\ub97c \uac00\uc9c0\ub294 \ubca1\ud130 \ud0c0\uc785\uc774 \uc788\uc73c\uba70, \ubca1\ud130 \uc694\uc18c\uc758 \ud0c0\uc785\uc740 \uc704\uc5d0\uc11c \uc5b8\uae09\ud55c \uac83\uc774 \ub420 \uc218 \uc788\ub2e4. \ubca1\ud130 \ud0c0\uc785\uc758 \uc120\uc5b8\uc740,<\/p>\n<ul>\n<li><strong>vec{2,3,4}<\/strong> : 2, 3 \ub610\ub294 4\uac1c\uc758 \uc694\uc18c\ub97c \uac00\uc9c0\ub294 \uc2e4\uc218 \ubca1\ud130<\/li>\n<li><strong>bvec{2,3,4}<\/strong> : 2, 3 \ub610\ub294 4\uac1c\uc758 \uc694\uc18c\ub97c \uac00\uc9c0\ub294 \ube14\ub9b0 \ubca1\ud130<\/li>\n<li><strong>ivec{2,3,4}<\/strong> : \uc815\uc218 \ubca1\ud130<\/li>\n<\/ul>\n<p>\uadf8\ub798\ud53d\uc5d0\uc11c \ub9e4\uc6b0 \uc911\uc694\ud55c 2&#215;2, 3&#215;3 \ub610\ub294 4&#215;4 \ud589\ub82c \ud0c0\uc785\uc774 \uc788\uc73c\uba70 \uc544\ub798\uc640 \uac19\ub2e4.<\/p>\n<ul>\n<li>mat2<\/li>\n<li>mat3<\/li>\n<li>mat4<\/li>\n<\/ul>\n<p>\ud14d\uc2a4\uccd0 \uc811\uadfc\uc774 \uac00\ub2a5\ud558\ub294 \ud2b9\ubcc4\ud55c \ud0c0\uc785\ub4e4\uc774 \uc788\ub2e4. \uc774 \ud0c0\uc785\ub4e4\uc740 \uc0d8\ud50c\ub7ec(Sampler)\ub77c\uace0 \ubd88\ub9ac\uba70, \ud14d\uc2a4\uccd0 \uac12(\ud14d\uc140;texel)\uc5d0 \uc811\uadfc\ud558\ub294\ub370 \uc0ac\uc6a9\ub41c\ub2e4. \uc774 \ud14d\uc2a4\uccd0 \uc0d8\ud50c\ub9c1\uc744 \uc704\ud55c \ub370\uc774\ud130 \ud0c0\uc785\uc740 \uc544\ub798\uc640 \uac19\ub2e4.<\/p>\n<ul>\n<li>sampler1D &#8211; 1D \ud14d\uc2a4\uccd0\uc744 \uc704\ud55c \uc0d8\ud50c\ub7ec<\/li>\n<li>sampler2D &#8211; 2D \ud14d\uc2a4\uccd0\ub97c \uc704\ud55c \uc0d8\ud50c\ub7ec<\/li>\n<li>sampler3D &#8211; 3D \ud14d\uc2a4\uccd0\ub97c \uc704\ud55c \uc0d8\ud50c\ub7ec<\/li>\n<li>samplerCube &#8211; \ud050\ube0c\ub9f5 \ud14d\uc2a4\uccd0\ub97c \uc704\ud55c \uc0d8\ud50c\ub7ec<\/li>\n<li>sampler1DShadow &#8211; \uadf8\ub9bc\uc790\ub9f5\uc744 \uc704\ud55c \uc0d8\ud50c\ub7ec<\/li>\n<li>sampler2DShadow &#8211; \uadf8\ub9bc\uc790\ub9f5\uc744 \uc704\ud55c \uc0d8\ud50c\ub7ec<\/li>\n<\/ul>\n<p>GLSL\uc5d0\uc11c \ubc30\uc5f4\uc740 C\uc5b8\uc5b4\uc5d0\uc11c\ucc98\ub7fc \uc120\uc5b8\ud560 \uc218 \uc788\ub2e4. \uadf8\ub7ec\ub098 \ubc30\uc5f4\uc740 \uc120\uc5b8\ud560\ub54c \ucd08\uae30\ud654\ud560 \uc218\uac00 \uc5c6\ub2e4. \ubc30\uc5f4\uc758 \uc694\uc18c\uc5d0 \uc811\uadfc\ud558\ub294 \ubc29\ubc95\uc740 C\uc5b8\uc5b4\uc640 \ub3d9\uc77c\ud558\ub2e4.<\/p>\n<p>\uad6c\uc870\uccb4 \uc5ed\uc2dc GLSL\uc5d0\uc11c \uac00\ub2a5\ud558\uba70, C\uc5b8\uc5b4\uc640 \ub3d9\uc77c\ud558\ub2e4.<\/p>\n<pre><code class=\"html\">struct dirlight {\r\n\tvec3 direction;\r\n\tvec3 color;\r\n};<\/code><\/pre>\n<p><strong>\ubcc0\uc218(Variables)<\/strong><\/p>\n<p>\uac04\ub2e8\ud55c \ubcc0\uc218\uc758 \uc120\uc5b8\uc740 C\uc5b8\uc5b4\uc640 \ub9e4\uc6b0 \uc720\uc0ac\ud558\ub2e4. \ubcc0\uc218\uc758 \uc120\uc5b8\uacfc \ud568\uaed8 \ucd08\uae30\ud654\ub3c4 \uac00\ub2a5\ud558\ub2e4.<\/p>\n<pre><code class=\"html\">float a, b; \/\/ 2\uac1c\uc758 \uc2e4\uc218\ud615 \ubcc0\uc218(C\uc5b8\uc5b4\ucc98\ub7fc \uc8fc\uc11d\uc774 \uac00\ub2a5\ud558\ub2e4)\r\nint c = 2 \/\/ c\ubcc0\uc218\ub294 2\ub85c \ucd08\uae30\ud654\ub418\uc5c8\ub2e4\r\nbool d = true; \/\/ d\ub294 true \uac12\uc774\ub2e4 <\/code><\/pre>\n<p>\ubcc0\uc218\uc758 \ub2e4\ub978 \ud0c0\uc785\uc774 \uc120\uc5b8 \uc5ed\uc2dc \uac19\uc740 \uc2dd\uc774\uc9c0\ub9cc, GLSL\uc640 C \uc0ac\uc774\uc5d0 \ucc28\uc774\uac00 \uc788\ub2e4. GLSL\uc740 \ucd08\uae30\ud654\uc640 \ud615\ubcc0\ud658 \uc0dd\uc131\uc790\uc5d0 \ub9e4\uc6b0 \uc758\uc874\uc801\uc774\ub2e4.<\/p>\n<pre><code class=\"html\">float b = 2; \/\/ \uc633\uc9c0\uc54a\uc544~ =_=; GLSL\uc5d0\ub294 \uc790\ub3d9\ud615\ubcc0\ud658\uc774 \uc54a\ub418~\r\nfloat e = (float)2; \/\/ \uc633\uc9c0\uc54a\uc544~ \ud615\ubcc0\ud658 \uc0dd\uc131\uc790\uac00 \ud544\uc694\ud574~\r\n\r\nint a = 2;\r\nfloat c = float(a); \/\/ \uc633\ub2e4! ^^* c\ub294 2.0\r\n\r\nvec3 f; \/\/ f\ub294 vec3\ub85c \uc120\uc5b8\r\nvec3 g = vec3(1.0, 2.0, 3.0); \/\/ \uc120\uc5b8\uacfc \ub3d9\uc2dc\uc5d0 \ucd08\uae30\ud654<\/code><\/pre>\n<p>GLSL\uc740 \ub2e4\ub978 \ubcc0\uc218\ub97c \uac00\uc9c0\uace0 \ucd08\uae30\ud654\ud558\ub294 \uac83\uc5d0 \ub9e4\uc6b0 \uc720\uc5f0\ud558\ub2e4. \ub2e4\uc74c \uc608\ub97c \ubcf4\uc790.<\/p>\n<pre><code class=\"html\">vec2 a = vec2(1.0, 2.0);\r\nvec2 b = vec2(3.0, 4.0);\r\n\r\nvec4 c = vec4(a, b); \/\/ c=vec4(1.0, 2.0, 3.0, 4.0)\r\n\r\nvec2 g = vec2(1.0, 2.0);\r\nfloat h = 3.0;\r\nvec3 j = vec3(g, h);<\/code><\/pre>\n<p>\ud589\ub82c\ub3c4 \ub9c8\ucc2c\uac00\uc9c0 \ubc29\uc2dd\uc774\ub2e4.<\/p>\n<pre><code class=\"html\">mat4 m = mat4(1.0); \/\/ \ud589\ub82c\uc758 \ub300\uac01\uc694\uc18c\ub97c 1.0\uc73c\ub85c \ucd08\uae30\ud654\r\n\r\nvec2 a = vec2(1.0, 2.0);\r\nvec2 b = vec2(3.0, 4.0);\r\nmat2 n = mat2(a, b); \/\/ \uceec\ub7fc \ubc29\ud5a5\uc73c\ub85c \uac12\uc774 \uc9c0\uc815\ub41c \ud589\ub82c\r\n\r\nmat2 k = mat2(1.0, 0.0, 1.0, 0.0); \/\/ \ubaa8\ub4e0 \uc694\uc18c\ub97c \uc9c0\uc815 <\/code><\/pre>\n<p>\uad6c\uc870\uccb4\uc758 \uc120\uc5b8\uacfc \ucd08\uae30\ud654\ub294 \uc544\ub798\uc640 \uac19\ub2e4.<\/p>\n<pre><code class=\"html\">struct dirlight { \/\/ \ud0c0\uc785\uc815\uc758\r\n\tvec3 direction;\r\n\tvec3 color;\r\n};\r\n\r\ndirlight d1;\r\ndirlight d2 = \r\n\tdirlight(vec(1.0, 1.0, 0.0), vec3(0.8, 0.8, 0.4));<\/code><\/pre>\n<p>GLSL\uc5d0\uc11c \uc81c\uacf5\ud558\ub294 \uba87\uac00\uc9c0 \uc5ec\uc720\ub85c\uc6c0\uc774 \uc6b0\ub9ac\uc758 \uc0b6\uc744 \ub2e8\uc21c\ud558\uac8c \ud574\uc8fc\uba70 \ucf54\ub4dc\ub97c \uba85\ud655\ud558\uac8c \ub9cc\ub4e4\uc5b4 \uc900\ub2e4. \uc544\ub798\uc758 \uc608\ub97c \ubcf4\uc790.<\/p>\n<pre><code class=\"html\">vec4 a = vec4(1.0, 2.0, 3.0, 4.0);\r\n\r\nfloat posX = a.x;\r\nfloat posY = a[1];\r\n\r\nvec2 posXY = a.xy;\r\n\r\nfloat depth = a.w;<\/code><\/pre>\n<p>\uc774\uc804 \ucf54\ub4dc\uc5d0\uc11c \uc0b4\ud3b4 \ubcf8\uac83\ucc98\ub7fc, \ubca1\ud130\uc758 \uc694\uc18c\uc5d0 \uc811\uadfc\ud558\uae30 \uc704\ud574\uc11c x, y, z, w \ubb38\uc790\ub97c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub2e4. \ub9cc\uc57d \uc0c9\uc0c1\uc5d0 \ub300\ud574\uc11c \uc774\uc57c\uae30\ud560\ub54c\ub294 r, g, b, a \ubb38\uc790\ub97c \uc0ac\uc6a9\ud558\uba74\ub41c\ub2e4. \ud14d\uc2a4\uccd0 \uc88c\ud45c\uc5d0\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ubb38\uc790\ub294 s, t, p, q\uc774\ub2e4. \ubcc0\ud658\uc5d0 \uc8fc\uc758\ud574\uc57c \ud558\ub294\ub370, \ud14d\uc2a4\uccd0 \uc88c\ud45c\ub294 s, t, <strong><span style=\"color: #ff0000;\">r<\/span><\/strong>, q\ub85c \uc790\uc8fc \ucc38\uc870\ub41c\ub2e4. \uadf8\ub7ec\ub098 r\uc740 \uc774\ubbf8 \uc55e\uc5d0\uc11c RGBA\uc5d0\uc758 &#8220;Red&#8221;\uc5d0 \ud574\ub2f9\ud558\ub294 \uac83\uc73c\ub85c \uc0ac\uc6a9\ub418\uace0 \uc788\ub2e4. \uc774\ub7ec\ud55c x, y, z, w, r, g, b, a, s, t, p, q\ub97c \uc120\ud0dd\uc790(Selector)\uc774\ub77c\uace0 \ud55c\ub2e4.<\/p>\n<p>\ud589\ub82c\uc5d0 \ub300\ud55c \uc120\ud0dd\uc790\ub294 \ud558\ub098\ub098 \ub450\uac1c \uc778\uc790\ub97c \ucde8\ud560 \uc218 \uc788\ub294\ub370, m[0] \ub610\ub294 m[2][3]\ucc98\ub7fc \ub9d0\uc774\ub2e4. \uccab\ubc88\uc9f8 \uacbd\uc6b0\ub294 \uccab\ubc88\uc9f8 \uceec\ub7fc\uc744 \uc120\ud0dd\ud55c \uac83\uc774\uace0 \ub450\ubc88\uc9f8 \uacbd\uc6b0\ub294 \ud589\ub82c\uc758 \uc694\uc18c\uc911\uc5d0 \ud558\ub098\uc758 \uc694\uc18c\ub97c \uc120\ud0dd\ud55c \uac83\uc774\ub2e4.<\/p>\n<p>\uad6c\uc870\uccb4\uc5d0\uc11c \uc694\uc18c\uc758 \uc774\ub984\uc740 C\uc5b8\uc5b4\uc5d0\uc11c\ucc98\ub7fc \uc0ac\uc6a9\ub41c\ub2e4. \uc704\uc758 \uad6c\uc870\uccb4 \uc124\uba85\uc5d0\uc11c \uc608\ub85c\uc368 \uc815\uc758\ud55c \uacbd\uc6b0\uc5d0\uc11c \uc608\ub97c \ub4e4\uc5b4\ubcf8\ub2e4\uba74..<\/p>\n<pre><code class=\"html\">d1.direction = vec3(1.0, 1.0, 1.0);<\/code><\/pre>\n<p><strong>\ubcc0\uc218 \ud3c9\uac00\uc790(Variable Qualifiers)<\/strong><\/p>\n<p>\ud3c9\uac00\uc790\ub294 \ubcc0\uc218\uc5d0 \ud2b9\ubcc4\ud55c \uc758\ubbf8\ub97c \uc81c\uacf5\ud55c\ub2e4. \ub2e4\uc74c\uacfc \uac19\uc740 \ud3c9\uac00\uc790\uac00 \uc788\ub2e4.<\/p>\n<p>const &#8211; \ubcc0\uc218\ub294 \uc0c1\uc218\uac12\uc774\ub2e4.<br \/>\nattribute &#8211; \uc804\uc5ed \ubcc0\uc218\uc774\uba70 \ubc84\ud14d\uc2a4 \ub9c8\ub2e4 \ubc14\ub014 \uc218 \uc788\uace0, OpenGL \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\ub85c \uac12\uc744 \ubcc0\uacbd\ud55c\ub2e4. \uc774 \ud3c9\uac00\uc790\ub294 \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0\uc11c\ub9cc \uc0ac\uc6a9\ub41c\ub2e4. \uc250\uc774\ub354\uc5d0\uc11c\ub294 \uc77d\uae30\uc804\uc6a9\uc774\ub2e4. Attribute \ubcc0\uc218 \uc139\uc158\uc744 \ucc38\uc870\ud558\uae30 \ubc14\ub780\ub2e4.<br \/>\nuniform &#8211; \uc804\uc5ed \ubcc0\uc218\uc774\uba70 \ud504\ub9ac\ubbf8\ud2f0\ube0c \ub9c8\ub2e4 \ubc14\ub014 \uc218 \uc788\uace0(glBegin, glEnd \uc0ac\uc774\uc5d0 \uc624\uc9c0 \uc54a\uc74c), OpenGL \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uc250\uc774\ub354\ub85c \uac12\uc744 \ubcc0\uacbd\ud55c\ub2e4.\uc774 \ud3c9\uac00\uc790\ub294 \ubc84\ud14d\uc2a4\ub098 \ud504\ub798\uadf8\uba3c\ud2b8 \uc250\uc774\ub354 \ubaa8\ub450\uc5d0\uc11c \uc0ac\uc6a9\ub420 \uc218 \uc788\ub2e4. \uc250\uc774\ub354\uc5d0\uc11c \uc774 \ubcc0\uc218\ub294 \uc0c1\uc218\uc774\ub2e4. Uniform \uc139\uc158\uc744 \ucc38\uc870\ud558\uae30 \ubc14\ub780\ub2e4.<\/p>\n<p>varying &#8211; \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc640 \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354 \uc0ac\uc774\uc5d0 \uac12\uc744 \uc8fc\uace0 \ubc1b\uae30 \uc704\ud574 \uc0ac\uc6a9\ub41c\ub2e4. \ubc84\ud14d\uc2a4 \uc250\uc774\ub354\uc5d0\uc11c\ub294 \uc4f0\uae30\uac00 \ud5c8\uc6a9\ub418\uc9c0\ub9cc, \ud504\ub808\uadf8\uba3c\ud2b8 \uc250\uc774\ub354\uc5d0\uc11c\ub294 \uc77d\uae30 \uc804\uc6a9\uc774\ub2e4. Varying \uc139\uc158\uc744 \ucc38\uace0\ud558\ub77c.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>GLSL\uc5d0\uc11c\uc758 \ub370\uc774\ud130 \ud0c0\uc785\uacfc \ubcc0\uc218 \uc6d0\ubb38 : http:\/\/www.lighthouse3d.com\/opengl\/glsl\/index.php?data \ud0c0\uc785(Type) GLSL\uc5d0\uc11c \uc0ac\uc6a9\uac00\ub2a5\ud55c \uac04\ub2e8\ud55c \ub370\uc774\ud130 \ud0c0\uc785\uc740 \ub2e4\uc74c\uacfc \uac19\ub2e4. float bool int float\uc640 int\ub294 C\uc5b8\uc5b4\uc640 \ub3d9\uc77c\ud558\uba70 bool\uc740 true\uc640 false \uac12\uc744 \ucde8\ud55c\ub2e4. 2, 3 \ub610\ub294 4\uac1c\uc758 \uc694\uc18c\ub97c \uac00\uc9c0\ub294 \ubca1\ud130 \ud0c0\uc785\uc774 \uc788\uc73c\uba70, \ubca1\ud130 \uc694\uc18c\uc758 \ud0c0\uc785\uc740 \uc704\uc5d0\uc11c \uc5b8\uae09\ud55c \uac83\uc774 \ub420 \uc218 \uc788\ub2e4. \ubca1\ud130 \ud0c0\uc785\uc758 \uc120\uc5b8\uc740, vec{2,3,4} : 2, 3 \ub610\ub294 4\uac1c\uc758 \uc694\uc18c\ub97c &hellip; <\/p>\n<p class=\"link-more\"><a href=\"http:\/\/www.gisdeveloper.co.kr\/?p=453\" class=\"more-link\">\ub354 \ubcf4\uae30<span class=\"screen-reader-text\"> &#8220;OpenGL Shader &#8211; 14&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[3,25],"class_list":["post-453","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl","tag-shader"],"_links":{"self":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=453"}],"version-history":[{"count":2,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/453\/revisions"}],"predecessor-version":[{"id":3586,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/453\/revisions\/3586"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=453"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}