feat: finish ghostty pane backend integration

1 files changed, 56 insertions, 0 deletions

diff --git a/vendor/libghostty-vt/pkg/opengl/Renderbuffer.zig b/vendor/libghostty-vt/pkg/opengl/Renderbuffer.zig
new file mode 100644
index 00000000..ef21287f
--- /dev/null
+++ b/vendor/libghostty-vt/pkg/opengl/Renderbuffer.zig
@@ -0,0 +1,56 @@
+const Renderbuffer = @This();
+
+const std = @import("std");
+const c = @import("c.zig").c;
+const errors = @import("errors.zig");
+const glad = @import("glad.zig");
+
+const Texture = @import("Texture.zig");
+
+id: c.GLuint,
+
+/// Create a single buffer.
+pub fn create() !Renderbuffer {
+    var rbo: c.GLuint = undefined;
+    glad.context.GenRenderbuffers.?(1, &rbo);
+    return .{ .id = rbo };
+}
+
+pub fn destroy(v: Renderbuffer) void {
+    glad.context.DeleteRenderbuffers.?(1, &v.id);
+}
+
+pub fn bind(v: Renderbuffer) !Binding {
+    // Keep track of the previous binding so we can restore it in unbind.
+    var current: c.GLint = undefined;
+    glad.context.GetIntegerv.?(c.GL_RENDERBUFFER_BINDING, &current);
+    glad.context.BindRenderbuffer.?(c.GL_RENDERBUFFER, v.id);
+    return .{ .previous = @intCast(current) };
+}
+
+pub const Binding = struct {
+    previous: c.GLuint,
+
+    pub fn unbind(self: Binding) void {
+        glad.context.BindRenderbuffer.?(
+            c.GL_RENDERBUFFER,
+            self.previous,
+        );
+    }
+
+    pub fn storage(
+        self: Binding,
+        format: Texture.InternalFormat,
+        width: c.GLsizei,
+        height: c.GLsizei,
+    ) !void {
+        _ = self;
+        glad.context.RenderbufferStorage.?(
+            c.GL_RENDERBUFFER,
+            @intCast(@intFromEnum(format)),
+            width,
+            height,
+        );
+        try errors.getError();
+    }
+};