Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/opensubdiv-source/examples/glPtexViewer/skyshader.glsl

@@ -0,0 +1,52 @@
+//
+//   Copyright 2013 Pixar
+//
+//   Licensed under the terms set forth in the LICENSE.txt file available at
+//   https://opensubdiv.org/license.
+//
+
+//--------------------------------------------------------------
+// sky vertex shader
+//--------------------------------------------------------------
+#ifdef SKY_VERTEX_SHADER
+
+layout (location=0) in vec3 position;
+layout (location=1) in vec2 texCoord;
+
+uniform mat4 ModelViewProjectionMatrix;
+
+out vec2 outTexCoord;
+
+void
+main()
+{
+    gl_Position = ModelViewProjectionMatrix * vec4(position, 1);
+    outTexCoord = texCoord.xy;
+}
+
+#endif
+
+//--------------------------------------------------------------
+// sky fragment shader
+//--------------------------------------------------------------
+#ifdef SKY_FRAGMENT_SHADER
+
+uniform sampler2D environmentMap;
+
+in vec2 outTexCoord;
+out vec4 outColor;
+
+vec4 getEnvironmentHDR(sampler2D sampler, vec2 uv)
+{
+    vec4 tex = texture(sampler, uv);
+    tex = vec4(pow(tex.xyz, vec3(0.4545)), 1);
+    return tex;
+}
+
+void
+main()
+{
+    outColor = getEnvironmentHDR(environmentMap, outTexCoord);
+}
+
+#endif