gpu: make Texture an enum with methods

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

gpu/src/Texture.zig

@@ -1,29 +1,32 @@
 const std = @import("std");
 
-ptr: *anyopaque,
+pub const Texture = enum(usize) {
+    _,
 
-pub const Aspect = enum(u32) {
+    pub const none: Texture = @intToEnum(Texture, 0);
+
+    pub const Aspect = enum(u32) {
         all = 0x00000000,
         stencil_only = 0x00000001,
         depth_only = 0x00000002,
         plane0_only = 0x00000003,
         plane1_only = 0x00000004,
-};
+    };
 
-pub const ComponentType = enum(u32) {
+    pub const ComponentType = enum(u32) {
         float = 0x00000000,
         sint = 0x00000001,
         uint = 0x00000002,
         depth_comparison = 0x00000003,
-};
+    };
 
-pub const Dimension = enum(u32) {
+    pub const Dimension = enum(u32) {
         dimension_1d = 0x00000000,
         dimension_2d = 0x00000001,
         dimension_3d = 0x00000002,
-};
+    };
 
-pub const Format = enum(u32) {
+    pub const Format = enum(u32) {
         undef = 0x00000000,
         r8_unorm = 0x00000001,
         r8_snorm = 0x00000002,
@@ -120,18 +123,18 @@ pub const Format = enum(u32) {
         astc12x12_unorm = 0x0000005d,
         astc12x12_unorm_srgb = 0x0000005e,
         r8_bg8_biplanar420_unorm = 0x0000005f,
-};
+    };
 
-pub const SampleType = enum(u32) {
+    pub const SampleType = enum(u32) {
         undef = 0x00000000,
         float = 0x00000001,
         unfilterable_float = 0x00000002,
         depth = 0x00000003,
         sint = 0x00000004,
         uint = 0x00000005,
-};
+    };
 
-pub const Usage = packed struct {
+    pub const Usage = packed struct {
         copy_src: bool = false,
         copy_dst: bool = false,
         texture_binding: bool = false,
@@ -153,4 +156,5 @@ pub const Usage = packed struct {
         pub fn equal(a: Usage, b: Usage) bool {
             return @truncate(u6, @bitCast(u32, a)) == @truncate(u6, @bitCast(u32, b));
         }
+    };
 };

gpu/src/main.zig

@@ -31,7 +31,7 @@ pub const Sampler = @import("sampler.zig").Sampler;
 pub const ShaderModule = @import("shader_module.zig").ShaderModule;
 pub const Surface = @import("surface.zig").Surface;
 pub const SwapChain = @import("swap_chain.zig").SwapChain;
-pub const Texture = @import("Texture.zig");
+pub const Texture = @import("texture.zig").Texture;
 pub const TextureView = @import("TextureView.zig");
 
 pub const AlphaMode = @import("types.zig").AlphaMode;
@@ -59,7 +59,7 @@ test {
     refAllDecls(@import("shader_module.zig"));
     refAllDecls(@import("surface.zig"));
     refAllDecls(@import("swap_chain.zig"));
-    refAllDecls(@import("Texture.zig"));
+    refAllDecls(@import("texture.zig"));
     refAllDecls(@import("TextureView.zig"));
     refAllDecls(@import("types.zig"));
 }