add hdr support

packages/shoji_wm/src/output.ts

@@ -36,6 +36,7 @@ function cloneOutputState(
         position: { ...snapshot.position },
         scale: snapshot.scale,
         availableModes: snapshot.availableModes.map((mode) => ({ ...mode })),
+        hdrSupported: snapshot.hdrSupported,
       },
     ]),
   );
@@ -65,6 +66,7 @@ function normalizeOutputState(
         position: { ...snapshot.position },
         scale: snapshot.scale,
         availableModes: snapshot.availableModes.map((mode) => ({ ...mode })),
+        hdrSupported: snapshot.hdrSupported,
       },
     ]),
   );
@@ -101,6 +103,7 @@ function cloneOutputConfigEntry(config: OutputConfigEntry): OutputConfigEntry {
           ? { ...config.position }
           : undefined,
     scale: config.scale,
+    hdr: config.hdr,
   };
 }
 

packages/shoji_wm/src/types.ts

@@ -919,6 +919,14 @@ export interface OutputExtendConfigEntry {
   resolution?: OutputResolutionPreference;
   position?: OutputPositionPreference;
   scale?: number;
+  /**
+   * Drive this output as HDR10 (PQ/BT.2020 signaling) when its EDID
+   * advertises ST 2084 support; ignored otherwise. Experimental: SDR
+   * content is composited in sRGB and PQ-encoded as a final pass.
+   * この出力の EDID が ST 2084 対応を示す場合、HDR10(PQ/BT.2020)で
+   * 駆動します。実験的機能です。
+   */
+  hdr?: boolean;
 }
 
 export interface OutputDisabledConfigEntry {
@@ -950,6 +958,8 @@ export interface OutputStateSnapshot {
   };
   scale: number;
   availableModes: OutputMode[];
+  /** EDID advertises HDR (CTA-861 static metadata block). */
+  hdrSupported?: boolean;
 }
 
 export interface OutputInfo extends OutputStateSnapshot {

src/shojiwm/src/backend/clipped_surface.frag

@@ -1,18 +1,31 @@
-precision highp float;
-
-uniform float alpha;
-varying vec2 v_coords;
+// Smithay substitutes the variant defines at the marker below, by plain string
+// replacement (see gles/shaders/mod.rs). Without it the replacement is a no-op
+// and all three compiled variants get identical source with EXTERNAL and
+// NO_ALPHA *undefined* — an external-OES buffer would then be sampled through a
+// `sampler2D` declaration, and NO_ALPHA (which smithay documents as mandatory
+// for custom texture shaders) would never be honoured.
+//
+// Do not write the marker's name anywhere else in this file: the replacement is
+// global, so a second occurrence — even inside a comment — would inject a
+// `#define` mid-line and break the following line out of its comment.
+//_DEFINES_
 
+// `#extension` must precede every non-preprocessor token in GLSL ES 1.00, so
+// it has to come before `precision` and any declaration.
 #if defined(EXTERNAL)
 #extension GL_OES_EGL_image_external : require
 #endif
 
+precision highp float;
+
 #if defined(EXTERNAL)
 uniform samplerExternalOES tex;
 #else
 uniform sampler2D tex;
 #endif
 
+uniform float alpha;
+varying vec2 v_coords;
 uniform float clip_scale;
 uniform vec2 slot_size;
 uniform vec2 slot_origin;
@@ -28,6 +41,148 @@ uniform vec2 sample_buffer_size;
 uniform vec2 sample_uv_snap_axes;
 uniform float sample_uv_compensation_enabled;
 
+// Per-surface color management. Compositing happens on sRGB-encoded BT.709
+// values, so content tagged with any other transfer/primaries via
+// `wp_color_management_v1` has to be converted on the way in — otherwise it is
+// decoded as if it were sRGB (which it never was) and again by
+// `output_encode.frag`, which is what makes PQ video look washed out.
+//
+// This is the SDR-correct conversion: HDR content is tone-mapped down into the
+// compositing range rather than carried at HDR luminance, because the encode
+// pass clamps to [0,1] before its own transfer. Carrying real HDR through
+// needs linear compositing and is a separate change.
+//
+// 0 = passthrough (untagged, or already sRGB in sRGB primaries), 1 = ST 2084 PQ,
+// 2 = extended linear (scRGB), 3 = sRGB transfer needing only a gamut change.
+uniform float src_transfer;
+// 0 = BT.709/sRGB primaries, 1 = BT.2020.
+uniform float src_primaries;
+// Content reference white in cd/m², from the surface's `Luminances` (or the
+// protocol's per-transfer-function defaults when unset). Doubles as the
+// compositing space's white point: 1.0 here means this many nits.
+uniform float src_ref_nits;
+// Tone-mapping knee parameters, already in the PQ domain because that is where
+// BT.2390 operates. Precomputed on the CPU via `color::colorimetry::
+// pq_inverse_eotf` — deriving them here would cost four extra pow-heavy calls
+// per fragment for values that are constant across the whole surface.
+uniform float src_pq_lo;   // content black
+uniform float src_pq_hi;   // content peak
+uniform float dst_pq_hi;   // what compositing-space 1.0 can represent
+
+// BT.2020 -> BT.709 linear-light gamut matrix, column-major. Inverse of the
+// BT.2087 matrix in `output_encode.frag`; both are cross-checked against the
+// CPU derivation in `color/colorimetry.rs`.
+const mat3 BT2020_TO_BT709 = mat3(
+     1.660491, -0.124550, -0.018151,
+    -0.587641,  1.132900, -0.100579,
+    -0.072850, -0.008349,  1.118730
+);
+
+// SMPTE ST 2084 (PQ) EOTF: PQ signal -> absolute cd/m². Inverse of
+// `pq_inv_eotf` in `output_encode.frag`.
+vec3 pq_eotf(vec3 e) {
+    const float m1 = 0.1593017578125;  // 1305/8192
+    const float m2 = 78.84375;         // 2523/32
+    const float c1 = 0.8359375;        // 107/128
+    const float c2 = 18.8515625;       // 2413/128
+    const float c3 = 18.6875;          // 2392/128
+    vec3 ep = pow(clamp(e, 0.0, 1.0), vec3(1.0 / m2));
+    vec3 num = max(ep - vec3(c1), vec3(0.0));
+    vec3 den = max(vec3(c2) - c3 * ep, vec3(0.000001));
+    return 10000.0 * pow(num / den, vec3(1.0 / m1));
+}
+
+// sRGB inverse EOTF (IEC 61966-2-1 piecewise encode).
+vec3 srgb_inv_eotf(vec3 c) {
+    vec3 lo = c * 12.92;
+    vec3 hi = 1.055 * pow(max(c, vec3(0.0)), vec3(1.0 / 2.4)) - 0.055;
+    return mix(hi, lo, vec3(lessThanEqual(c, vec3(0.0031308))));
+}
+
+// SMPTE ST 2084 (PQ) inverse EOTF: absolute cd/m² -> PQ signal. Mirrors the
+// one in `output_encode.frag`; needed here to lift non-PQ sources into the
+// domain BT.2390 works in.
+vec3 pq_inv_eotf(vec3 nits) {
+    const float m1 = 0.1593017578125;
+    const float m2 = 78.84375;
+    const float c1 = 0.8359375;
+    const float c2 = 18.8515625;
+    const float c3 = 18.6875;
+    vec3 y = clamp(nits / 10000.0, 0.0, 1.0);
+    vec3 ym = pow(y, vec3(m1));
+    return pow((vec3(c1) + c2 * ym) / (vec3(1.0) + c3 * ym), vec3(m2));
+}
+
+// ITU-R BT.2390 EETF, applied per channel on a PQ signal.
+//
+// Below the knee this is the *identity*, so content already inside the target
+// range passes through untouched — the decisive advantage over a global curve
+// like Reinhard, which pulls midtones down alongside highlights and leaves the
+// whole image flat. Above the knee a Hermite spline rolls smoothly off to the
+// target peak. Operating in PQ rather than linear light spreads the
+// compression error evenly across *perceived* brightness.
+float bt2390_channel(float e) {
+    float range = max(src_pq_hi - src_pq_lo, 0.000001);
+    float e1 = clamp((e - src_pq_lo) / range, 0.0, 1.0);
+    float max_lum = clamp((dst_pq_hi - src_pq_lo) / range, 0.0, 1.0);
+    float ks = 1.5 * max_lum - 0.5;
+
+    float e2 = e1;
+    if (ks < 1.0 && e1 > ks) {
+        float t = (e1 - ks) / (1.0 - ks);
+        float t2 = t * t;
+        float t3 = t2 * t;
+        e2 = (2.0 * t3 - 3.0 * t2 + 1.0) * ks
+           + (t3 - 2.0 * t2 + t) * (1.0 - ks)
+           + (-2.0 * t3 + 3.0 * t2) * max_lum;
+    }
+    return e2 * range + src_pq_lo;
+}
+
+vec3 bt2390_eetf(vec3 pq) {
+    return vec3(
+        bt2390_channel(pq.r),
+        bt2390_channel(pq.g),
+        bt2390_channel(pq.b)
+    );
+}
+
+// sRGB EOTF (IEC 61966-2-1 piecewise decode).
+vec3 srgb_eotf(vec3 c) {
+    vec3 lo = c / 12.92;
+    vec3 hi = pow((max(c, vec3(0.0)) + vec3(0.055)) / 1.055, vec3(2.4));
+    return mix(hi, lo, vec3(lessThanEqual(c, vec3(0.04045))));
+}
+
+// Convert one sampled, *unpremultiplied* texel into the compositing space.
+vec3 to_compositing_space(vec3 c) {
+    float ref_nits = max(src_ref_nits, 0.0001);
+
+    // Lift the source into the PQ domain, which is where the tone curve works.
+    vec3 pq;
+    if (src_transfer > 2.5) {
+        // sRGB transfer in wider primaries: decode, scale to absolute nits.
+        pq = pq_inv_eotf(srgb_eotf(c) * ref_nits);
+    } else if (src_transfer > 1.5) {
+        // Extended linear (scRGB): 1.0 is defined as 80 cd/m².
+        pq = pq_inv_eotf(max(c, vec3(0.0)) * 80.0);
+    } else {
+        // Already a PQ signal.
+        pq = clamp(c, 0.0, 1.0);
+    }
+
+    // Compress the content's range into what the compositing space can hold.
+    // SDR sources land entirely below the knee and pass through unchanged.
+    vec3 linear = pq_eotf(bt2390_eetf(pq));
+
+    if (src_primaries > 0.5) {
+        linear = BT2020_TO_BT709 * linear;
+    }
+    // Normalize against the content's own reference white so diffuse white
+    // lands on 1.0 rather than being scaled by an unrelated display value.
+    return srgb_inv_eotf(clamp(linear / ref_nits, 0.0, 1.0));
+}
+
 float rounded_alpha(vec2 coords, vec2 size) {
     if (coords.x < 0.0 || coords.y < 0.0 || coords.x > size.x || coords.y > size.y) {
         return 0.0;
@@ -80,6 +235,19 @@ void main() {
     }
 
     vec4 color = texture2D(tex, sample_coords);
+#if defined(NO_ALPHA)
+    // Buffer carries no alpha channel. Force it here, immediately after the
+    // sample — *not* at the end, where it would overwrite the rounded-corner
+    // coverage written by `rounded_alpha` below and square off every corner.
+    color = vec4(color.rgb, 1.0);
+#endif
+    if (src_transfer > 0.5) {
+        // Wayland buffers carry premultiplied alpha. A transfer function is
+        // non-linear, so it has to be applied to the unpremultiplied value or
+        // partially transparent edges pick up haloes; re-premultiply after.
+        float a = max(color.a, 0.0001);
+        color.rgb = to_compositing_space(color.rgb / a) * a;
+    }
     vec2 local_coords = (input_to_local * vec3(v_coords, 1.0)).xy;
     if (rect_bounds_enabled > 0.5) {
         vec2 slot_coords = local_coords - slot_origin;

src/shojiwm/src/backend/clipped_surface.rs

@@ -146,6 +146,16 @@ pub struct ClippedSurfaceElement {
     sample_buffer_size: [f32; 2],
     sample_uv_snap_axes: [f32; 2],
     sample_uv_compensation_enabled: f32,
+    /// Per-surface color management, resolved once at element construction.
+    /// `src_transfer == 0.0` is the untagged fast path and makes the shader
+    /// skip the conversion entirely, so nothing changes for sRGB clients.
+    src_transfer: f32,
+    src_primaries: f32,
+    src_ref_nits: f32,
+    /// Tone-mapping knee, already PQ-encoded on the CPU.
+    src_pq_lo: f32,
+    src_pq_hi: f32,
+    dst_pq_hi: f32,
 }
 
 #[derive(Debug)]
@@ -207,6 +217,7 @@ impl ClippedSurfaceElement {
         clip: ContentClip,
         forced_geometry: Option<Rectangle<i32, Physical>>,
         debug_label: Option<String>,
+        image_description: Option<crate::color::ImageDescription>,
     ) -> Result<Self, GlesError> {
         if renderer
             .egl_context()
@@ -273,6 +284,30 @@ impl ClippedSurfaceElement {
                         "sample_uv_compensation_enabled",
                         smithay::backend::renderer::gles::UniformType::_1f,
                     ),
+                    UniformName::new(
+                        "src_transfer",
+                        smithay::backend::renderer::gles::UniformType::_1f,
+                    ),
+                    UniformName::new(
+                        "src_primaries",
+                        smithay::backend::renderer::gles::UniformType::_1f,
+                    ),
+                    UniformName::new(
+                        "src_ref_nits",
+                        smithay::backend::renderer::gles::UniformType::_1f,
+                    ),
+                    UniformName::new(
+                        "src_pq_lo",
+                        smithay::backend::renderer::gles::UniformType::_1f,
+                    ),
+                    UniformName::new(
+                        "src_pq_hi",
+                        smithay::backend::renderer::gles::UniformType::_1f,
+                    ),
+                    UniformName::new(
+                        "dst_pq_hi",
+                        smithay::backend::renderer::gles::UniformType::_1f,
+                    ),
                 ],
             )?);
             renderer
@@ -482,6 +517,59 @@ impl ClippedSurfaceElement {
             }
         }
 
+        // Resolve the surface's color-management tag into shader uniforms once,
+        // here, rather than per-fragment. `src_transfer == 0.0` is the untagged
+        // path and makes the shader skip the conversion, so sRGB clients are
+        // byte-identical to before.
+        let (
+            src_transfer, 
+            src_primaries,
+            src_ref_nits, 
+            src_pq_lo,
+            src_pq_hi, 
+            dst_pq_hi,
+        ) = match image_description {
+            Some(description) => {
+                let primaries = match description.primaries {
+                    crate::color::ColorPrimaries::Srgb => 0.0,
+                    crate::color::ColorPrimaries::Bt2020 => 1.0,
+                };
+                let transfer = match description.tf {
+                    // sRGB in sRGB primaries already *is* the compositing
+                    // space. In a wider gamut it still needs the matrix, so it
+                    // takes the decode-only branch instead of the fast path.
+                    crate::color::TransferCharacteristics::Srgb if primaries == 0.0 => 0.0,
+                    crate::color::TransferCharacteristics::Srgb => 3.0,
+                    crate::color::TransferCharacteristics::St2084Pq => 1.0,
+                    crate::color::TransferCharacteristics::ExtLinear => 2.0,
+                };
+                let luminances = description.effective_luminances();
+                // MaxCLL is the measured peak of the content; fall back to the
+                // description's declared maximum when the client didn't send it.
+                let max_nits = description
+                    .max_cll
+                    .map(|cll| cll as f32)
+                    .unwrap_or(luminances.max);
+                // BT.2390 operates on PQ signals, so encode the knee here
+                // rather than paying four pow() calls per fragment for values
+                // that are constant across the surface. The target peak is the
+                // content's own reference white, which is what compositing-space
+                // 1.0 represents.
+                let to_pq = |nits: f32| {
+                    crate::color::colorimetry::pq_inverse_eotf(nits as f64) as f32
+                };
+                (
+                    transfer,
+                    primaries,
+                    luminances.reference,
+                    to_pq(luminances.min),
+                    to_pq(max_nits),
+                    to_pq(luminances.reference),
+                )
+            }
+            None => (0.0, 0.0, 0.0, 0.0, 0.0, 0.0),
+        };
+
         Ok(Self {
             inner,
             geometry: render_geometry,
@@ -507,6 +595,12 @@ impl ClippedSurfaceElement {
             } else {
                 0.0
             },
+            src_transfer,
+            src_primaries,
+            src_ref_nits,
+            src_pq_lo,
+            src_pq_hi,
+            dst_pq_hi,
         })
     }
 
@@ -648,6 +742,12 @@ impl ClippedSurfaceElement {
                 "sample_uv_compensation_enabled",
                 self.sample_uv_compensation_enabled,
             ),
+            Uniform::new("src_transfer", self.src_transfer),
+            Uniform::new("src_primaries", self.src_primaries),
+            Uniform::new("src_ref_nits", self.src_ref_nits),
+            Uniform::new("src_pq_lo", self.src_pq_lo),
+            Uniform::new("src_pq_hi", self.src_pq_hi),
+            Uniform::new("dst_pq_hi", self.dst_pq_hi),
         ]
     }
 }