src/ona/gfx.zig

@@ -2,12 +2,12 @@ const App = @import("./App.zig");
 
 const coral = @import("coral");
 
-const formats = @import("./gfx/formats.zig");
-
 const device = @import("./gfx/device.zig");
 
 const ext = @import("./ext.zig");
 
+const formats = @import("./gfx/formats.zig");
+
 const msg = @import("./msg.zig");
 
 const std = @import("std");
@@ -19,10 +19,10 @@ pub const Assets = struct {
 
 	pub const Format = struct {
 		extension: []const u8,
-		open_file: *const fn (*std.heap.ArenaAllocator, []const u8) Error!Desc,
+		file_desc: *const fn (*std.heap.ArenaAllocator, []const u8) Error!Desc,
 
 		pub const Error = std.mem.Allocator.Error || coral.files.Error || error {
-			Unsupported,
+			FormatUnsupported,
 		};
 	};
 
@@ -40,7 +40,7 @@ pub const Assets = struct {
 				continue;
 			}
 
-			return self.context.open(try format.open_file(&self.staging_arena, path));
+			return self.context.open(try format.file_desc(&self.staging_arena, path));
 		}
 
 		return .none;
@@ -91,16 +91,12 @@ pub const Desc = union (enum) {
 		};
 
 		pub const Format = enum {
-			rgba8888,
-			bgra8888,
-			argb8888,
-			rgb888,
-			bgr888,
+			rgba8,
+			bgra8,
 
 			pub fn byte_size(self: Format) usize {
 				return switch (self) {
-					.rgba8888, .bgra8888, .argb8888 => 4,
-					.rgb888, .bgr888 => 3,
+					.rgba8, .bgra8 => 4,
 				};
 			}
 		};
@@ -197,7 +193,7 @@ pub const Transform2D = extern struct {
 const builtin_formats = [_]Assets.Format{
 	.{
 		.extension = "bmp",
-		.open_file = formats.load_bmp,
+		.file_desc = formats.bmp_file_desc,
 	},
 };
 

src/ona/gfx/device.zig

@@ -253,6 +253,11 @@ const Loop = struct {
 									break: get subimage;
 								},
 							},
+
+							.pixel_format = switch (texture.format) {
+								.rgba8 => .RGBA8,
+								.bgra8 => .BGRA8,
+							},
 						});
 
 						errdefer sokol.gfx.destroyImage(image);

src/ona/gfx/formats.zig

@@ -4,7 +4,7 @@ const gfx = @import("../gfx.zig");
 
 const std = @import("std");
 
-pub fn load_bmp(arena: *std.heap.ArenaAllocator, path: []const u8) gfx.Assets.Format.Error!gfx.Desc {
+pub fn bmp_file_desc(arena: *std.heap.ArenaAllocator, path: []const u8) gfx.Assets.Format.Error!gfx.Desc {
 	const header = try coral.files.bundle.read_little(path, 0, extern struct {
 		type: [2]u8 align (1),
 		file_size: u32 align (1),
@@ -22,15 +22,15 @@ pub fn load_bmp(arena: *std.heap.ArenaAllocator, path: []const u8) gfx.Assets.Fo
 		palette_colors_used: u32 align (1),
 		important_colors_used: u32 align (1),
 	}) orelse {
-		return error.Unsupported;
+		return error.FormatUnsupported;
 	};
 
 	if (!std.mem.eql(u8, &header.type, "BM")) {
-		return error.Unsupported;
+		return error.FormatUnsupported;
 	}
 
 	const pixel_width = std.math.cast(u16, header.pixel_width) orelse {
-		return error.Unsupported;
+		return error.FormatUnsupported;
 	};
 
 	const pixels = try arena.allocator().alloc(coral.io.Byte, header.image_size);
@@ -42,27 +42,35 @@ pub fn load_bmp(arena: *std.heap.ArenaAllocator, path: []const u8) gfx.Assets.Fo
 	var buffer_offset: usize = 0;
 	var file_offset = @as(usize, header.image_offset);
 
-	while (buffer_offset < pixels.len) {
-		const line = pixels[buffer_offset .. buffer_offset + byte_stride];
+	switch (header.bits_per_pixel) {
+		32 => {
+			while (buffer_offset < pixels.len) {
+				const line = pixels[buffer_offset .. buffer_offset + byte_stride];
 
-		if (try coral.files.bundle.read_bytes(path, file_offset, line) != byte_stride) {
-			return error.Unsupported;
-		}
+				if (try coral.files.bundle.read_bytes(path, file_offset, line) != byte_stride) {
+					return error.FormatUnsupported;
+				}
 
-		file_offset = line.len + byte_padding;
-		buffer_offset += padded_byte_stride;
+				for (0 .. pixel_width) |i| {
+					const line_offset = i * 4;
+					const pixel = line[line_offset .. line_offset + 4];
+
+					std.mem.swap(u8, &pixel[0], &pixel[2]);
+				}
+
+				file_offset += line.len + byte_padding;
+				buffer_offset += padded_byte_stride;
+			}
+		},
+
+		else => return error.FormatUnsupported,
 	}
 
 	return .{
 		.texture = .{
-			.format = switch (header.bits_per_pixel) {
-				24 => .bgr888,
-				32 => .bgra8888,
-				else => return error.Unsupported,
-			},
-
 			.width = pixel_width,
 			.data = pixels,
+			.format = .rgba8,
 			.access = .static,
 		}
 	};

src/ona/gfx/shaders/instance_2d.glsl

@@ -51,6 +51,10 @@ out vec4 texel;
 
 void main() {
 	texel = texture(sampler2D(tex, smp), uv) * color;
+
+	if (texel.a == 0) {
+		discard;
+	}
 }
 @end