feat: Rename Gizmo material to UnlitFixedSize, and expose methods for using this material on other entities. Also exposes new methods for setting single float parameters.

2024-10-31 22:34:51 +08:00
parent 91d653b288
commit bfdda4a7cc
31 changed files with 1813 additions and 1634 deletions
--- a/materials/unlit_fixed_size.mat
+++ b/materials/unlit_fixed_size.mat
@@ -0,0 +1,54 @@
+    material {
+        name : UnlitFixedSize,
+        parameters : [
+            {
+                type : mat4,
+                name : transform,
+                precision : high
+            },
+            {
+                type : float4,
+                name : baseColorFactor,
+                precision : low
+            },
+            {
+                type: float, // the number of world-space units between the camera and the (unscaled) gizmo
+                name: scale,
+                precision: low
+            }
+        ],
+        depthWrite : true,
+        depthCulling : false,
+        shadingModel : unlit,
+        blending: transparent,
+        variantFilter : [ skinning, shadowReceiver, vsm ],
+        culling: none,
+        instanced: false,
+        vertexDomain: object
+    }
+
+    vertex {
+        void materialVertex(inout MaterialVertexInputs material) {	
+            // the object should have the same size (in screen-space), no matter the distance from the camera
+            // scale the model-space vertex positions by the distance from the camera
+            vec4 modelSpace = getPosition();
+            vec4 worldSpace = getWorldFromModelMatrix() * modelSpace;
+            vec4 viewSpace = getViewFromWorldMatrix() * worldSpace;           
+            float distanceFromCamera = length(viewSpace.xyz);
+            modelSpace.xyz *= (distanceFromCamera / materialParams.scale); 
+
+            worldSpace = getWorldFromModelMatrix() * modelSpace;
+            material.worldPosition = worldSpace;
+            //vec4 clipSpace = getClipFromWorldMatrix() * worldSpace;
+            //clipSpace.z = 0.99f;
+            //material.worldPosition = getWorldFromClipMatrix() * clipSpace;
+        }
+    }
+
+    fragment {
+        void material(inout MaterialInputs material) {
+            prepareMaterial(material);
+            material.baseColor = materialParams.baseColorFactor;
+        }
+    }
+