added background and opacity material option

Author: AlexSchwank

test_assets/TextureFileFormatTests/Readme.md

@@ -2,6 +2,8 @@
 
 This set of assets is intended to test support for loading and rendering basic texture file formats.
 
+The left material for each texture case is not using opacity. The right material is.
+
 ## Screenshot
 
 ![screenshot](screenshots/all_files.png)  

test_assets/TextureFileFormatTests/_scene.usda

@@ -39,10 +39,48 @@ def Xform "Scene" (
                 float2 outputs:result
             }
         }
+
+        def Material "MainMaterialWithOpacity"
+        {
+            token outputs:surface.connect = </Scene/Looks/MainMaterialWithOpacity/PbrPreview.outputs:surface>
+
+            def Shader "PbrPreview"
+            {
+                uniform token info:id = "UsdPreviewSurface"
+                color3f inputs:diffuseColor.connect  = </Scene/Looks/MainMaterialWithOpacity/Diffuse.outputs:rgb>
+                float inputs:opacity.connect = </Scene/Looks/MainMaterialWithOpacity/Diffuse.outputs:a>
+                token outputs:surface
+            }
+
+            def Shader "Diffuse"
+            {
+                uniform token info:id = "UsdUVTexture"
+                float2 inputs:st.connect = </Scene/Looks/MainMaterialWithOpacity/Primvar.outputs:result>
+                float3 outputs:rgb
+                float outputs:a
+            }
+
+            def Shader "Primvar"
+            {
+                uniform token info:id = "UsdPrimvarReader_float2"
+                string inputs:varname = "st"
+                float2 outputs:result
+            }
+        }
     }
 
     def Xform "Geom"
     {
+        def Mesh "Backgroud"
+        {
+            color3f[] primvars:displayColor = [(0.7, 0, 0.7)] (
+                interpolation = "constant"
+            )
+            int[] faceVertexCounts = [4]
+            int[] faceVertexIndices = [0, 1, 2, 3]
+            point3f[] points = [(-0.1,-0.1,-0.1), (2.2,-0.1,-0.1), (2.2,1.1,-0.1), (-0.1,1.1,-0.1)]
+        }
+
         def Mesh "Plane" (
             prepend apiSchemas = ["MaterialBindingAPI"]
         )
@@ -53,5 +91,16 @@ def Xform "Scene" (
             int[] faceVertexIndices = [0, 1, 2, 3]
             point3f[] points = [(0,0,0), (1,0,0), (1,1,0), (0,1,0)]
         }
+
+        def Mesh "PlaneWithOpacity" (
+            prepend apiSchemas = ["MaterialBindingAPI"]
+        )
+        {
+            rel material:binding = </Scene/Looks/MainMaterialWithOpacity>
+            float2[] primvars:st = [(0, 0), (1, 0), (1, 1), (0, 1)] (interpolation = "vertex")
+            int[] faceVertexCounts = [4]
+            int[] faceVertexIndices = [0, 1, 2, 3]
+            point3f[] points = [(1.1,0,0), (2.1,0,0), (2.1,1,0), (1.1,1,0)]
+        }
     }
 }

test_assets/TextureFileFormatTests/all_files.usda

@@ -48,7 +48,7 @@ def Scope "Scene" (
     }
 
     def Xform "png" {
-        double3 xformOp:translate = (2, 0, 0)
+        double3 xformOp:translate = (3, 0, 0)
         uniform token[] xformOpOrder = ["xformOp:translate"]
 
         over "png_grayscale_8bit" (

test_assets/TextureFileFormatTests/jpeg_cmyk_8-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @jpeg_cmyk_8-bit.jpg@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @jpeg_cmyk_8-bit.jpg@
+            }
+        }
     }
 }

test_assets/TextureFileFormatTests/jpeg_grayscale_8-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @jpeg_grayscale_8-bit.jpg@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @jpeg_grayscale_8-bit.jpg@
+            }
+        }
     }
 }

test_assets/TextureFileFormatTests/jpeg_rgb_8-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @jpeg_rgb_8-bit.jpg@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @jpeg_rgb_8-bit.jpg@
+            }
+        }
     }
 }

test_assets/TextureFileFormatTests/png_grayscale_16-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @png_grayscale_16-bit.png@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @png_grayscale_16-bit.png@
+            }
+        }
     }
 }

test_assets/TextureFileFormatTests/png_grayscale_8-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @png_grayscale_8-bit.png@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @png_grayscale_8-bit.png@
+            }
+        }
     }
 }

test_assets/TextureFileFormatTests/png_rgb_16-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @png_rgb_16-bit.png@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @png_rgb_16-bit.png@
+            }
+        }
     }
 }

test_assets/TextureFileFormatTests/png_rgb_32-bit.usda

@@ -22,5 +22,13 @@ over "Scene"
                 asset inputs:file = @png_rgb_32-bit.png@
             }
         }
+
+        over "MainMaterialWithOpacity"
+        {
+            over "Diffuse"
+            {
+                asset inputs:file = @png_rgb_32-bit.png@
+            }
+        }
     }
 }