Added cubemap stars

core/src/mindustry/graphics/CubemapMesh.java

@@ -0,0 +1,85 @@
+package mindustry.graphics;
+
+import arc.*;
+import arc.graphics.*;
+import arc.graphics.Texture.*;
+import arc.graphics.VertexAttributes.*;
+import arc.graphics.gl.*;
+import arc.math.geom.*;
+import arc.util.*;
+
+public class CubemapMesh implements Disposable{
+    private static final float[] vertices = {
+    -1.0f,  1.0f, -1.0f,
+    -1.0f, -1.0f, -1.0f,
+    1.0f, -1.0f, -1.0f,
+    1.0f, -1.0f, -1.0f,
+    1.0f,  1.0f, -1.0f,
+    -1.0f,  1.0f, -1.0f,
+
+    -1.0f, -1.0f,  1.0f,
+    -1.0f, -1.0f, -1.0f,
+    -1.0f,  1.0f, -1.0f,
+    -1.0f,  1.0f, -1.0f,
+    -1.0f,  1.0f,  1.0f,
+    -1.0f, -1.0f,  1.0f,
+
+    1.0f, -1.0f, -1.0f,
+    1.0f, -1.0f,  1.0f,
+    1.0f,  1.0f,  1.0f,
+    1.0f,  1.0f,  1.0f,
+    1.0f,  1.0f, -1.0f,
+    1.0f, -1.0f, -1.0f,
+
+    -1.0f, -1.0f,  1.0f,
+    -1.0f,  1.0f,  1.0f,
+    1.0f,  1.0f,  1.0f,
+    1.0f,  1.0f,  1.0f,
+    1.0f, -1.0f,  1.0f,
+    -1.0f, -1.0f,  1.0f,
+
+    -1.0f,  1.0f, -1.0f,
+    1.0f,  1.0f, -1.0f,
+    1.0f,  1.0f,  1.0f,
+    1.0f,  1.0f,  1.0f,
+    -1.0f,  1.0f,  1.0f,
+    -1.0f,  1.0f, -1.0f,
+
+    -1.0f, -1.0f, -1.0f,
+    -1.0f, -1.0f,  1.0f,
+    1.0f, -1.0f, -1.0f,
+    1.0f, -1.0f, -1.0f,
+    -1.0f, -1.0f,  1.0f,
+    1.0f, -1.0f,  1.0f
+    };
+
+    private final Mesh mesh;
+    private final Cubemap map;
+    private final Shader shader;
+
+    public CubemapMesh(Cubemap map){
+        this.map = map;
+        this.map.setFilter(TextureFilter.Linear);
+        this.mesh = new Mesh(true, vertices.length, 0,
+            new VertexAttribute(Usage.position, 3, "a_position")
+        );
+        mesh.getVerticesBuffer().limit(vertices.length);
+        mesh.getVerticesBuffer().put(vertices, 0, vertices.length);
+
+        shader = new Shader(Core.files.internal("shaders/cubemap.vert"), Core.files.internal("shaders/cubemap.frag"));
+    }
+
+    public void render(Mat3D projection){
+        map.bind();
+        shader.bind();
+        shader.setUniformi("u_cubemap", 0);
+        shader.setUniformMatrix4("u_proj", projection.val);
+        mesh.render(shader, Gl.triangles);
+    }
+
+    @Override
+    public void dispose(){
+        mesh.dispose();
+        map.dispose();
+    }
+}