Add nxt::VertexFormat::FloatR32

next.json

@@ -945,7 +945,8 @@
         "values": [
             {"value": 0, "name": "float r32 g32 b32 a32"},
             {"value": 1, "name": "float r32 g32 b32"},
-            {"value": 2, "name": "float r32 g32"}
+            {"value": 2, "name": "float r32 g32"},
+            {"value": 3, "name": "float r32"}
         ]
     },
     "void": {

src/backend/common/InputState.cpp

@@ -37,6 +37,8 @@ namespace backend {
                 return 3;
             case nxt::VertexFormat::FloatR32G32:
                 return 2;
+            case nxt::VertexFormat::FloatR32:
+                return 1;
         }
     }
 
@@ -45,6 +47,7 @@ namespace backend {
             case nxt::VertexFormat::FloatR32G32B32A32:
             case nxt::VertexFormat::FloatR32G32B32:
             case nxt::VertexFormat::FloatR32G32:
+            case nxt::VertexFormat::FloatR32:
                 return VertexFormatNumComponents(format) * sizeof(float);
         }
     }

src/backend/d3d12/InputStateD3D12.cpp

@@ -25,6 +25,8 @@ namespace d3d12 {
                 return DXGI_FORMAT_R32G32B32_FLOAT;
             case nxt::VertexFormat::FloatR32G32:
                 return DXGI_FORMAT_R32G32_FLOAT;
+            case nxt::VertexFormat::FloatR32:
+                return DXGI_FORMAT_R32_FLOAT;
         }
     }
 

src/backend/metal/InputStateMTL.mm

@@ -28,6 +28,8 @@ namespace metal {
                     return MTLVertexFormatFloat3;
                 case nxt::VertexFormat::FloatR32G32:
                     return MTLVertexFormatFloat2;
+                case nxt::VertexFormat::FloatR32:
+                    return MTLVertexFormatFloat;
             }
         }
 
@@ -71,6 +73,8 @@ namespace metal {
             if (info.stride == 0) {
                 // For MTLVertexStepFunctionConstant, the stepRate must be 0,
                 // but the stride must NOT be 0, so I made up a value (256).
+                // TODO(cwallez@chromium.org): the made up value will need to be at least
+                //    max(attrib.offset + sizeof(attrib) for each attrib)
                 layoutDesc.stepFunction = MTLVertexStepFunctionConstant;
                 layoutDesc.stepRate = 0;
                 layoutDesc.stride = 256;

src/backend/opengl/CommandBufferGL.cpp

@@ -49,6 +49,7 @@ namespace opengl {
             case nxt::VertexFormat::FloatR32G32B32A32:
             case nxt::VertexFormat::FloatR32G32B32:
             case nxt::VertexFormat::FloatR32G32:
+            case nxt::VertexFormat::FloatR32:
                 return GL_FLOAT;
         }
     }