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//! Represents a render target.
//!
//! In this case, an OpenGL renderbuffer-backed framebuffer.
const Self = @This();
const std = @import("std");
const Allocator = std.mem.Allocator;
const assert = std.debug.assert;
const builtin = @import("builtin");
const gl = @import("opengl");
const log = std.log.scoped(.opengl);
/// Options for initializing a Target
pub const Options = struct {
/// Desired width
width: usize,
/// Desired height
height: usize,
/// Internal format for the renderbuffer.
internal_format: gl.Texture.InternalFormat,
};
/// The underlying `gl.Framebuffer` instance.
framebuffer: gl.Framebuffer,
/// The underlying `gl.Renderbuffer` instance.
renderbuffer: gl.Renderbuffer,
/// Current width of this target.
width: usize,
/// Current height of this target.
height: usize,
pub fn init(opts: Options) !Self {
const rbo = try gl.Renderbuffer.create();
const bound_rbo = try rbo.bind();
defer bound_rbo.unbind();
try bound_rbo.storage(
opts.internal_format,
@intCast(opts.width),
@intCast(opts.height),
);
const fbo = try gl.Framebuffer.create();
const bound_fbo = try fbo.bind(.framebuffer);
defer bound_fbo.unbind();
try bound_fbo.renderbuffer(.color0, rbo);
return .{
.framebuffer = fbo,
.renderbuffer = rbo,
.width = opts.width,
.height = opts.height,
};
}
pub fn deinit(self: *Self) void {
self.framebuffer.destroy();
self.renderbuffer.destroy();
}
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