gpu: add ConstantEntry

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

gpu/src/TODO

@@ -107,12 +107,6 @@ typedef struct WGPURenderPipelineDescriptor {
 
 
 
-typedef struct WGPUConstantEntry {
-    WGPUChainedStruct const * nextInChain;
-    char const * key;
-    double value;
-} WGPUConstantEntry;
-
 // TODO: Dawn-specific?
 typedef struct WGPUCopyTextureForBrowserOptions {
     WGPUChainedStruct const * nextInChain;

gpu/src/main.zig

@@ -94,6 +94,7 @@ pub const MultisampleState = @import("structs.zig").MultisampleState;
 pub const PrimitiveState = @import("structs.zig").PrimitiveState;
 pub const StorageTextureBindingLayout = @import("structs.zig").StorageTextureBindingLayout;
 pub const DepthStencilState = @import("structs.zig").DepthStencilState;
+pub const ConstantEntry = @import("structs.zig").ConstantEntry;
 pub const ProgrammableStageDescriptor = @import("structs.zig").ProgrammableStageDescriptor;
 
 // Enumerations

gpu/src/structs.zig

@@ -57,6 +57,12 @@ pub const DepthStencilState = struct {
     depth_bias_clamp: f32,
 };
 
+// TODO: how does this map to browser API?
+pub const ConstantEntry = struct {
+    key: [*:0]const u8,
+    value: f64,
+};
+
 pub const ProgrammableStageDescriptor = struct {
     label: ?[*:0]const u8 = null,
     module: ShaderModule,
@@ -71,5 +77,6 @@ test "syntax" {
     _ = PrimitiveState;
     _ = StorageTextureBindingLayout;
     _ = DepthStencilState;
+    _ = ConstantEntry;
     _ = ProgrammableStageDescriptor;
 }