🎉 initial commit

shaders/bg.gdshader

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+shader_type canvas_item;
+
+uniform sampler2D background : source_color;
+
+void fragment() {
+    COLOR = texture(background, UV);
+}
+

shaders/zclip.gdshader

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+// this shader is applied to spatial nodes
+shader_type spatial;
+
+// specifies the field of view angle in degrees
+uniform float FOV : hint_range(0.0, 180.0) = 70.0;
+
+// sets the base color of the material
+uniform vec4 albedo : source_color = vec4(1.0);
+// specifies the albedo texture used for the material
+uniform sampler2D texture_albedo : source_color;
+
+// transforms vertex positions and sets up projection matrix
+void vertex() {
+    // calculate tangent of half the FOV angle
+    float onetanfov = 1.0f / tan(.5f * (FOV * PI / 180.0f));
+    // calculate aspect ratio based on viewport size
+    float aspect = VIEWPORT_SIZE.x / VIEWPORT_SIZE.y;
+    // modify the projection matrix to adjust FOV
+    PROJECTION_MATRIX[1][1] = -onetanfov;
+    PROJECTION_MATRIX[0][0] = onetanfov / aspect;
+
+    // transform vertex position into clip space
+    POSITION = PROJECTION_MATRIX * MODELVIEW_MATRIX * vec4(VERTEX.xyz, 1.0);
+    // adjust z-coordinate to prevent clipping
+    POSITION.z = mix(POSITION.z, 0.0, 0.999);
+}
+
+// calculates final color using albedo texture and color
+void fragment() {
+    // sample albedo texture at the current UV coordinate
+    vec4 albedo_tex = texture(texture_albedo, UV);
+    // multiply albedo color with texture color to get final color
+    ALBEDO = albedo.rgb * albedo_tex.rgb;
+}
+
+