reworking command buffers, adding soft compute routines

src/soft/SoftImage.zig

@@ -7,6 +7,7 @@ const lib = @import("lib.zig");
 const VkError = base.VkError;
 const Device = base.Device;
 
+const SoftBuffer = @import("SoftBuffer.zig");
 const SoftDevice = @import("SoftDevice.zig");
 
 const Self = @This();
@@ -57,3 +58,49 @@ pub fn clearRange(self: *Self, color: vk.ClearColorValue, range: vk.ImageSubreso
         .r32g32b32a32_sfloat;
     self.clear(.{ .color = color }, clear_format, self.interface.format, range, null);
 }
+
+pub fn copyImage(self: *const Self, self_layout: vk.ImageLayout, dst: *Self, dst_layout: vk.ImageLayout, regions: []const vk.ImageCopy) VkError!void {
+    _ = self;
+    _ = self_layout;
+    _ = dst;
+    _ = dst_layout;
+    _ = regions;
+    std.log.scoped(.commandExecutor).warn("FIXME: implement image to image copy", .{});
+}
+
+pub fn copyImageToBuffer(self: *const Self, self_layout: vk.ImageLayout, dst: *SoftBuffer, regions: []const vk.BufferImageCopy) VkError!void {
+    _ = self_layout;
+    for (regions) |region| {
+        const src_memory = if (self.interface.memory) |memory| memory else return VkError.InvalidDeviceMemoryDrv;
+        const dst_memory = if (dst.interface.memory) |memory| memory else return VkError.InvalidDeviceMemoryDrv;
+
+        const pixel_size: u32 = @intCast(self.interface.getPixelSize());
+        const image_row_pitch: u32 = self.interface.extent.width * pixel_size;
+        const image_size: u32 = @intCast(self.interface.getTotalSize());
+
+        const buffer_row_length: u32 = if (region.buffer_row_length != 0) region.buffer_row_length else region.image_extent.width;
+        const buffer_row_pitch: u32 = buffer_row_length * pixel_size;
+        const buffer_size: u32 = buffer_row_pitch * region.image_extent.height * region.image_extent.depth;
+
+        const src_map: []u8 = @as([*]u8, @ptrCast(try src_memory.map(0, image_size)))[0..image_size];
+        const dst_map: []u8 = @as([*]u8, @ptrCast(try dst_memory.map(region.buffer_offset, buffer_size)))[0..buffer_size];
+
+        const row_size = region.image_extent.width * pixel_size;
+        for (0..self.interface.extent.depth) |z| {
+            for (0..self.interface.extent.height) |y| {
+                const z_as_u32: u32 = @intCast(z);
+                const y_as_u32: u32 = @intCast(y);
+
+                const src_offset = ((@as(u32, @intCast(region.image_offset.z)) + z_as_u32) * self.interface.extent.height + @as(u32, @intCast(region.image_offset.y)) + y_as_u32) * image_row_pitch + @as(u32, @intCast(region.image_offset.x)) * pixel_size;
+                const dst_offset = (z_as_u32 * buffer_row_length * region.image_extent.height + y_as_u32 * buffer_row_length) * pixel_size;
+
+                const src_slice = src_map[src_offset..(src_offset + row_size)];
+                const dst_slice = dst_map[dst_offset..(dst_offset + row_size)];
+                @memcpy(dst_slice, src_slice);
+            }
+        }
+
+        src_memory.unmap();
+        dst_memory.unmap();
+    }
+}