Merge pull request #10 from KTStephano/dev

Adding skybox shader

Author: KTStephano

resources/shaders/skybox.fs

@@ -0,0 +1,11 @@
+STRATUS_GLSL_VERSION
+
+in vec3 fsTexCoords;
+
+layout (location = 0) out vec4 fsColor;
+
+uniform samplerCube skybox;
+
+void main() {
+    fsColor = texture(skybox, fsTexCoords);
+}

resources/shaders/skybox.vs

@@ -0,0 +1,18 @@
+STRATUS_GLSL_VERSION
+
+layout (location = 0)  in vec3 position;
+
+out vec3 fsTexCoords;
+
+uniform mat4 projection;
+uniform mat4 view;
+
+void main() {
+    fsTexCoords = position;
+    vec4 pos = projection * view * vec4(position, 1.0);
+    // Set the z and w components to w so that w / w = 1.0 which
+    // is the maximum depth value. This will allow the graphics pipeline
+    // to know that we always want the skybox to fail the depth test if a valid
+    // pixel is already in the buffer from a previous stage.
+    gl_Position = pos.xyww;
+}