From a700f36d804e9c6c64bdb4aa00bd7a039f3f553e Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Tue, 21 Sep 2021 20:31:17 -0400
Subject: Add missing skybox shader files.

Oopsies!
---
 Makefile.am                   |  4 +++-
 data/shaders/skybox-frag.glsl | 28 ++++++++++++++++++++++++++++
 data/shaders/skybox-vert.glsl | 25 +++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 data/shaders/skybox-frag.glsl
 create mode 100644 data/shaders/skybox-vert.glsl

diff --git a/Makefile.am b/Makefile.am
index 883418a..da69162 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -155,7 +155,9 @@ dist_shaders_DATA =				\
   data/shaders/pbr-vert.glsl			\
   data/shaders/pbr-frag.glsl			\
   data/shaders/phong-vert.glsl			\
-  data/shaders/phong-frag.glsl
+  data/shaders/phong-frag.glsl			\
+  data/shaders/skybox-frag.glsl			\
+  data/shaders/skybox-vert.glsl
 
 info_TEXINFOS = doc/chickadee.texi
 doc_chickadee_TEXINFOS =			\
diff --git a/data/shaders/skybox-frag.glsl b/data/shaders/skybox-frag.glsl
new file mode 100644
index 0000000..b388828
--- /dev/null
+++ b/data/shaders/skybox-frag.glsl
@@ -0,0 +1,28 @@
+// -*- mode: c -*-
+
+#ifdef GLSL120
+varying vec3 fragDir;
+#else
+in vec3 fragDir;
+#endif
+
+#ifdef GLSL330
+out vec4 fragColor;
+#endif
+
+#ifndef GLSL330
+#define fragColor gl_FragColor
+#endif
+
+uniform samplerCube cubeMap;
+
+#ifndef GLSL330
+// Compatibility shim for older GLSL versions.
+vec3 texture(samplerCube tex, vec3 coord) {
+  return textureCube(tex, coord);
+}
+#endif
+
+void main() {
+  fragColor = texture(cubeMap, fragDir);
+}
diff --git a/data/shaders/skybox-vert.glsl b/data/shaders/skybox-vert.glsl
new file mode 100644
index 0000000..312fcd6
--- /dev/null
+++ b/data/shaders/skybox-vert.glsl
@@ -0,0 +1,25 @@
+// -*- mode: c -*-
+
+#ifdef GLSL330
+layout (location = 0) in vec3 position;
+#elif defined(GLSL130)
+in vec3 position;
+#elif defined(GLSL120)
+attribute vec3 position;
+#endif
+
+#ifdef GLSL120
+varying vec3 fragDir;
+#else
+out vec3 fragDir;
+#endif
+
+uniform mat4 view;
+uniform mat4 projection;
+
+void main() {
+  // Remove the translation part of the view matrix.
+  mat4 viewDir = mat4(mat3(view));
+  fragDir = position;
+  gl_Position = projection * viewDir * vec4(position, 1.0);
+}
-- 
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