renderer/metal: images required by placements become textures

src/renderer/metal/api.zig

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+//! This file contains the definitions of the Metal API that we use.
+
+/// https://developer.apple.com/documentation/metal/mtlloadaction?language=objc
+pub const MTLLoadAction = enum(c_ulong) {
+    dont_care = 0,
+    load = 1,
+    clear = 2,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlstoreaction?language=objc
+pub const MTLStoreAction = enum(c_ulong) {
+    dont_care = 0,
+    store = 1,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlstoragemode?language=objc
+pub const MTLStorageMode = enum(c_ulong) {
+    shared = 0,
+    managed = 1,
+    private = 2,
+    memoryless = 3,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlprimitivetype?language=objc
+pub const MTLPrimitiveType = enum(c_ulong) {
+    point = 0,
+    line = 1,
+    line_strip = 2,
+    triangle = 3,
+    triangle_strip = 4,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlindextype?language=objc
+pub const MTLIndexType = enum(c_ulong) {
+    uint16 = 0,
+    uint32 = 1,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlvertexformat?language=objc
+pub const MTLVertexFormat = enum(c_ulong) {
+    uchar4 = 3,
+    float2 = 29,
+    int2 = 33,
+    uint2 = 37,
+    uchar = 45,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlvertexstepfunction?language=objc
+pub const MTLVertexStepFunction = enum(c_ulong) {
+    constant = 0,
+    per_vertex = 1,
+    per_instance = 2,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlpixelformat?language=objc
+pub const MTLPixelFormat = enum(c_ulong) {
+    r8unorm = 10,
+    rgba8uint = 73,
+    bgra8unorm = 80,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlpurgeablestate?language=objc
+pub const MTLPurgeableState = enum(c_ulong) {
+    empty = 4,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlblendfactor?language=objc
+pub const MTLBlendFactor = enum(c_ulong) {
+    zero = 0,
+    one = 1,
+    source_color = 2,
+    one_minus_source_color = 3,
+    source_alpha = 4,
+    one_minus_source_alpha = 5,
+    dest_color = 6,
+    one_minus_dest_color = 7,
+    dest_alpha = 8,
+    one_minus_dest_alpha = 9,
+    source_alpha_saturated = 10,
+    blend_color = 11,
+    one_minus_blend_color = 12,
+    blend_alpha = 13,
+    one_minus_blend_alpha = 14,
+    source_1_color = 15,
+    one_minus_source_1_color = 16,
+    source_1_alpha = 17,
+    one_minus_source_1_alpha = 18,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlblendoperation?language=objc
+pub const MTLBlendOperation = enum(c_ulong) {
+    add = 0,
+    subtract = 1,
+    reverse_subtract = 2,
+    min = 3,
+    max = 4,
+};
+
+/// https://developer.apple.com/documentation/metal/mtlresourceoptions?language=objc
+/// (incomplete, we only use this mode so we just hardcode it)
+pub const MTLResourceStorageModeShared: c_ulong = @intFromEnum(MTLStorageMode.shared) << 4;
+
+pub const MTLClearColor = extern struct {
+    red: f64,
+    green: f64,
+    blue: f64,
+    alpha: f64,
+};
+
+pub const MTLViewport = extern struct {
+    x: f64,
+    y: f64,
+    width: f64,
+    height: f64,
+    znear: f64,
+    zfar: f64,
+};
+
+pub const MTLRegion = extern struct {
+    origin: MTLOrigin,
+    size: MTLSize,
+};
+
+pub const MTLOrigin = extern struct {
+    x: c_ulong,
+    y: c_ulong,
+    z: c_ulong,
+};
+
+pub const MTLSize = extern struct {
+    width: c_ulong,
+    height: c_ulong,
+    depth: c_ulong,
+};
+
+pub extern "c" fn MTLCreateSystemDefaultDevice() ?*anyopaque;