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@@ -6,6 +6,38 @@ Rotate [`mpv`][] videos by [arbitrary angles on the GPU][]. |
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[`mpv`]: https://mpv.io |
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[arbitrary angles on the GPU]: https://github.com/mpv-player/mpv/issues/3434#issuecomment-275195855 |
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+## Installation |
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+ |
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+Copy or [symlink][] the following file into the [`mpv` configuration |
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+directory][], preserving subdirectories: |
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+ |
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+- [`scripts/gpu_rotate.lua`][] |
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+ |
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+Example usage configuration can be found in: |
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+ |
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+- [`mpv.conf.example`][] |
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+- [`input.conf.example`][] |
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+ |
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+On Unix-likes, creating symlinks can be done automatically by [`stow`][] by |
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+running the following from the repository root: |
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+ |
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+```sh |
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+stow --no-folding --ignore='\.example$' --target="$HOME/.config/mpv" . |
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+``` |
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+ |
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+[symlink]: https://en.wikipedia.org/wiki/Symbolic_link |
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+[`mpv` configuration directory]: https://mpv.io/manual/master/#files |
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+[`scripts/gpu_rotate.lua`]: scripts/gpu_rotate.lua |
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+[`mpv.conf.example`]: mpv.conf.example |
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+[`input.conf.example`]: input.conf.example |
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+[`stow`]: https://www.gnu.org/software/stow/ |
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+ |
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+## Contributing |
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+ |
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+Lint with [`luacheck`][]. |
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+ |
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+[`luacheck`]: https://github.com/mpeterv/luacheck |
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+ |
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## License |
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Licensed under the [ISC License][] unless otherwise noted, see the |
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new file mode 100644 |
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@@ -0,0 +1,8 @@ |
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+# Usually the default. Writes speratate shader files to change rotation angle. |
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+# `os.tmpname()` is used to generate the filenames. On some systems this file |
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+# is readable by other users, but it contains no user- or video-specific |
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+# information, only the rotation angle. |
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+vo=gpu |
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+ |
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+# Enable debug printing. |
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+# msg-level=gpu_rotate=debug |
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new file mode 100644 |
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@@ -0,0 +1,75 @@ |
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+--- Require |
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+ |
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+local mp = require("mp")
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+ |
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+--- Constants |
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+ |
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+local SHADER_META = [[ |
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+//!HOOK MAINPRESUB |
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+//!DESC GPU rotate |
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+//!BIND HOOKED |
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+]] |
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+ |
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+local SHADER_DEFINE = "#define angle" |
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+ |
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+local SHADER_HOOK = [[ |
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+vec4 hook() |
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+{
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+ float rad = radians(angle); |
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+ float c = cos(rad); |
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+ float s = sin(rad); |
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+ mat2 rot = mat2(c, -s, s, c); |
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+ vec2 pos = rot * ((HOOKED_pos - 0.5) * HOOKED_size) * HOOKED_pt + 0.5; |
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+ if (!all(equal(pos, clamp(pos, 0.0, 1.0)))) |
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+ return vec4(0.0); |
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+ return HOOKED_tex(pos); |
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+} |
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+]] |
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+ |
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+--- State |
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+ |
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+local state = {
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+ angle = 0.0, |
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+ shader = nil, |
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+} |
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+ |
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+--- Functions |
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+ |
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+local function shader_define() |
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+ return table.concat({SHADER_DEFINE, state.angle}, " ")
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+end |
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+ |
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+local function remove() |
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+ if state.shader then |
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+ mp.msg.debug("Removing", state.shader)
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+ mp.commandv("change-list", "glsl-shaders", "remove", state.shader)
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+ os.remove(state.shader) |
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+ state.shader = nil |
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+ end |
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+end |
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+ |
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+local function append(angle) |
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+ state.angle = angle % 360 |
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+ remove() |
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+ state.shader = os.tmpname() |
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+ mp.msg.debug("Writing", state.shader)
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+ local file = io.open(state.shader, "w") |
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+ file:write(table.concat({
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+ SHADER_META, |
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+ shader_define(), |
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+ SHADER_HOOK, |
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+ }, "\n")) |
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+ file:close() |
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+ mp.commandv("change-list", "glsl-shaders", "append", state.shader)
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+end |
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+ |
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+--- Events |
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+ |
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+mp.register_event("shutdown", remove)
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+ |
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+--- Script messages |
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+ |
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+local function set(angle) append(angle) end |
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+local function add(angle) append(angle + state.angle) end |
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+mp.register_script_message("set", set)
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+mp.register_script_message("add", add)
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