diff --git a/libs/renderengine/Android.bp b/libs/renderengine/Android.bp
index ecfaef8..07c5dd8 100644
--- a/libs/renderengine/Android.bp
+++ b/libs/renderengine/Android.bp
@@ -42,6 +42,7 @@
     ],
 
     static_libs: [
+        "libshaders",
         "libtonemap",
     ],
     local_include_dirs: ["include"],
diff --git a/libs/renderengine/benchmark/Android.bp b/libs/renderengine/benchmark/Android.bp
index baa5054..471159f 100644
--- a/libs/renderengine/benchmark/Android.bp
+++ b/libs/renderengine/benchmark/Android.bp
@@ -35,6 +35,7 @@
     ],
     static_libs: [
         "librenderengine",
+        "libshaders",
         "libtonemap",
     ],
     cflags: [
diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.cpp b/libs/renderengine/skia/SkiaGLRenderEngine.cpp
index 21d5603..376e279 100644
--- a/libs/renderengine/skia/SkiaGLRenderEngine.cpp
+++ b/libs/renderengine/skia/SkiaGLRenderEngine.cpp
@@ -636,9 +636,9 @@
         const ui::Dataspace outputDataspace =
                 mUseColorManagement ? display.outputDataspace : ui::Dataspace::V0_SRGB_LINEAR;
 
-        LinearEffect effect = LinearEffect{.inputDataspace = inputDataspace,
-                                           .outputDataspace = outputDataspace,
-                                           .undoPremultipliedAlpha = undoPremultipliedAlpha};
+        auto effect = shaders::LinearEffect{.inputDataspace = inputDataspace,
+                                            .outputDataspace = outputDataspace,
+                                            .undoPremultipliedAlpha = undoPremultipliedAlpha};
 
         auto effectIter = mRuntimeEffects.find(effect);
         sk_sp<SkRuntimeEffect> runtimeEffect = nullptr;
diff --git a/libs/renderengine/skia/SkiaGLRenderEngine.h b/libs/renderengine/skia/SkiaGLRenderEngine.h
index 74ce651..53792f9 100644
--- a/libs/renderengine/skia/SkiaGLRenderEngine.h
+++ b/libs/renderengine/skia/SkiaGLRenderEngine.h
@@ -133,7 +133,8 @@
     // Cache of GL textures that we'll store per GraphicBuffer ID, shared between GPU contexts.
     std::unordered_map<GraphicBufferId, std::shared_ptr<AutoBackendTexture::LocalRef>> mTextureCache
             GUARDED_BY(mRenderingMutex);
-    std::unordered_map<LinearEffect, sk_sp<SkRuntimeEffect>, LinearEffectHasher> mRuntimeEffects;
+    std::unordered_map<shaders::LinearEffect, sk_sp<SkRuntimeEffect>, shaders::LinearEffectHasher>
+            mRuntimeEffects;
     AutoBackendTexture::CleanupManager mTextureCleanupMgr GUARDED_BY(mRenderingMutex);
 
     StretchShaderFactory mStretchShaderFactory;
diff --git a/libs/renderengine/skia/filters/LinearEffect.cpp b/libs/renderengine/skia/filters/LinearEffect.cpp
index b43a3aa..36305ae 100644
--- a/libs/renderengine/skia/filters/LinearEffect.cpp
+++ b/libs/renderengine/skia/filters/LinearEffect.cpp
@@ -19,303 +19,19 @@
 #define ATRACE_TAG ATRACE_TAG_GRAPHICS
 
 #include <SkString.h>
-#include <tonemap/tonemap.h>
+#include <log/log.h>
+#include <shaders/shaders.h>
 #include <utils/Trace.h>
 
-#include <optional>
-
-#include "log/log.h"
-#include "math/mat4.h"
-#include "system/graphics-base-v1.0.h"
-#include "ui/ColorSpace.h"
+#include <math/mat4.h>
 
 namespace android {
 namespace renderengine {
 namespace skia {
 
-static aidl::android::hardware::graphics::common::Dataspace toAidlDataspace(
-        ui::Dataspace dataspace) {
-    return static_cast<aidl::android::hardware::graphics::common::Dataspace>(dataspace);
-}
-
-static void generateEOTF(ui::Dataspace dataspace, SkString& shader) {
-    switch (dataspace & HAL_DATASPACE_TRANSFER_MASK) {
-        case HAL_DATASPACE_TRANSFER_ST2084:
-            shader.append(R"(
-
-                float3 EOTF(float3 color) {
-                    float m1 = (2610.0 / 4096.0) / 4.0;
-                    float m2 = (2523.0 / 4096.0) * 128.0;
-                    float c1 = (3424.0 / 4096.0);
-                    float c2 = (2413.0 / 4096.0) * 32.0;
-                    float c3 = (2392.0 / 4096.0) * 32.0;
-
-                    float3 tmp = pow(clamp(color, 0.0, 1.0), 1.0 / float3(m2));
-                    tmp = max(tmp - c1, 0.0) / (c2 - c3 * tmp);
-                    return pow(tmp, 1.0 / float3(m1));
-                }
-            )");
-            break;
-        case HAL_DATASPACE_TRANSFER_HLG:
-            shader.append(R"(
-                float EOTF_channel(float channel) {
-                    const float a = 0.17883277;
-                    const float b = 0.28466892;
-                    const float c = 0.55991073;
-                    return channel <= 0.5 ? channel * channel / 3.0 :
-                            (exp((channel - c) / a) + b) / 12.0;
-                }
-
-                float3 EOTF(float3 color) {
-                    return float3(EOTF_channel(color.r), EOTF_channel(color.g),
-                            EOTF_channel(color.b));
-                }
-            )");
-            break;
-        case HAL_DATASPACE_TRANSFER_LINEAR:
-            shader.append(R"(
-                float3 EOTF(float3 color) {
-                    return color;
-                }
-            )");
-            break;
-        case HAL_DATASPACE_TRANSFER_SRGB:
-        default:
-            shader.append(R"(
-
-                float EOTF_sRGB(float srgb) {
-                    return srgb <= 0.04045 ? srgb / 12.92 : pow((srgb + 0.055) / 1.055, 2.4);
-                }
-
-                float3 EOTF_sRGB(float3 srgb) {
-                    return float3(EOTF_sRGB(srgb.r), EOTF_sRGB(srgb.g), EOTF_sRGB(srgb.b));
-                }
-
-                float3 EOTF(float3 srgb) {
-                    return sign(srgb.rgb) * EOTF_sRGB(abs(srgb.rgb));
-                }
-            )");
-            break;
-    }
-}
-
-static void generateXYZTransforms(SkString& shader) {
-    shader.append(R"(
-        uniform float4x4 in_rgbToXyz;
-        uniform float4x4 in_xyzToRgb;
-        float3 ToXYZ(float3 rgb) {
-            return (in_rgbToXyz * float4(rgb, 1.0)).rgb;
-        }
-
-        float3 ToRGB(float3 xyz) {
-            return clamp((in_xyzToRgb * float4(xyz, 1.0)).rgb, 0.0, 1.0);
-        }
-    )");
-}
-
-// Conversion from relative light to absolute light (maps from [0, 1] to [0, maxNits])
-static void generateLuminanceScalesForOOTF(ui::Dataspace inputDataspace,
-                                           ui::Dataspace outputDataspace, SkString& shader) {
-    switch (inputDataspace & HAL_DATASPACE_TRANSFER_MASK) {
-        case HAL_DATASPACE_TRANSFER_ST2084:
-            shader.append(R"(
-                    float3 ScaleLuminance(float3 xyz) {
-                        return xyz * 10000.0;
-                    }
-                )");
-            break;
-        case HAL_DATASPACE_TRANSFER_HLG:
-            shader.append(R"(
-                    float3 ScaleLuminance(float3 xyz) {
-                        return xyz * 1000.0 * pow(xyz.y, 0.2);
-                    }
-                )");
-            break;
-        default:
-            switch (outputDataspace & HAL_DATASPACE_TRANSFER_MASK) {
-                case HAL_DATASPACE_TRANSFER_ST2084:
-                case HAL_DATASPACE_TRANSFER_HLG:
-                    // SDR -> HDR tonemap
-                    shader.append(R"(
-                            float3 ScaleLuminance(float3 xyz) {
-                                return xyz * in_libtonemap_inputMaxLuminance;
-                            }
-                        )");
-                    break;
-                default:
-                    // Input and output are both SDR, so no tone-mapping is expected so
-                    // no-op the luminance normalization.
-                    shader.append(R"(
-                                float3 ScaleLuminance(float3 xyz) {
-                                    return xyz * in_libtonemap_displayMaxLuminance;
-                                }
-                            )");
-                    break;
-            }
-    }
-}
-
-// Normalizes from absolute light back to relative light (maps from [0, maxNits] back to [0, 1])
-static void generateLuminanceNormalizationForOOTF(ui::Dataspace outputDataspace, SkString& shader) {
-    switch (outputDataspace & HAL_DATASPACE_TRANSFER_MASK) {
-        case HAL_DATASPACE_TRANSFER_ST2084:
-            shader.append(R"(
-                    float3 NormalizeLuminance(float3 xyz) {
-                        return xyz / 10000.0;
-                    }
-                )");
-            break;
-        case HAL_DATASPACE_TRANSFER_HLG:
-            shader.append(R"(
-                    float3 NormalizeLuminance(float3 xyz) {
-                        return xyz / 1000.0 * pow(xyz.y / 1000.0, -0.2 / 1.2);
-                    }
-                )");
-            break;
-        default:
-            shader.append(R"(
-                    float3 NormalizeLuminance(float3 xyz) {
-                        return xyz / in_libtonemap_displayMaxLuminance;
-                    }
-                )");
-            break;
-    }
-}
-
-static void generateOOTF(ui::Dataspace inputDataspace, ui::Dataspace outputDataspace,
-                         SkString& shader) {
-    shader.append(tonemap::getToneMapper()
-                          ->generateTonemapGainShaderSkSL(toAidlDataspace(inputDataspace),
-                                                          toAidlDataspace(outputDataspace))
-                          .c_str());
-
-    generateLuminanceScalesForOOTF(inputDataspace, outputDataspace, shader);
-    generateLuminanceNormalizationForOOTF(outputDataspace, shader);
-
-    shader.append(R"(
-            float3 OOTF(float3 linearRGB, float3 xyz) {
-                float3 scaledLinearRGB = ScaleLuminance(linearRGB);
-                float3 scaledXYZ = ScaleLuminance(xyz);
-
-                float gain = libtonemap_LookupTonemapGain(scaledLinearRGB, scaledXYZ);
-
-                return NormalizeLuminance(scaledXYZ * gain);
-            }
-        )");
-}
-
-static void generateOETF(ui::Dataspace dataspace, SkString& shader) {
-    switch (dataspace & HAL_DATASPACE_TRANSFER_MASK) {
-        case HAL_DATASPACE_TRANSFER_ST2084:
-            shader.append(R"(
-
-                float3 OETF(float3 xyz) {
-                    float m1 = (2610.0 / 4096.0) / 4.0;
-                    float m2 = (2523.0 / 4096.0) * 128.0;
-                    float c1 = (3424.0 / 4096.0);
-                    float c2 = (2413.0 / 4096.0) * 32.0;
-                    float c3 = (2392.0 / 4096.0) * 32.0;
-
-                    float3 tmp = pow(xyz, float3(m1));
-                    tmp = (c1 + c2 * tmp) / (1.0 + c3 * tmp);
-                    return pow(tmp, float3(m2));
-                }
-            )");
-            break;
-        case HAL_DATASPACE_TRANSFER_HLG:
-            shader.append(R"(
-                float OETF_channel(float channel) {
-                    const float a = 0.17883277;
-                    const float b = 0.28466892;
-                    const float c = 0.55991073;
-                    return channel <= 1.0 / 12.0 ? sqrt(3.0 * channel) :
-                            a * log(12.0 * channel - b) + c;
-                }
-
-                float3 OETF(float3 linear) {
-                    return float3(OETF_channel(linear.r), OETF_channel(linear.g),
-                            OETF_channel(linear.b));
-                }
-            )");
-            break;
-        case HAL_DATASPACE_TRANSFER_LINEAR:
-            shader.append(R"(
-                float3 OETF(float3 linear) {
-                    return linear;
-                }
-            )");
-            break;
-        case HAL_DATASPACE_TRANSFER_SRGB:
-        default:
-            shader.append(R"(
-                float OETF_sRGB(float linear) {
-                    return linear <= 0.0031308 ?
-                            linear * 12.92 : (pow(linear, 1.0 / 2.4) * 1.055) - 0.055;
-                }
-
-                float3 OETF_sRGB(float3 linear) {
-                    return float3(OETF_sRGB(linear.r), OETF_sRGB(linear.g), OETF_sRGB(linear.b));
-                }
-
-                float3 OETF(float3 linear) {
-                    return sign(linear.rgb) * OETF_sRGB(abs(linear.rgb));
-                }
-            )");
-            break;
-    }
-}
-
-static void generateEffectiveOOTF(bool undoPremultipliedAlpha, SkString& shader) {
-    shader.append(R"(
-        uniform shader child;
-        half4 main(float2 xy) {
-            float4 c = float4(child.eval(xy));
-    )");
-    if (undoPremultipliedAlpha) {
-        shader.append(R"(
-            c.rgb = c.rgb / (c.a + 0.0019);
-        )");
-    }
-    shader.append(R"(
-        float3 linearRGB = EOTF(c.rgb);
-        float3 xyz = ToXYZ(linearRGB);
-        c.rgb = OETF(ToRGB(OOTF(linearRGB, xyz)));
-    )");
-    if (undoPremultipliedAlpha) {
-        shader.append(R"(
-            c.rgb = c.rgb * (c.a + 0.0019);
-        )");
-    }
-    shader.append(R"(
-            return c;
-        }
-    )");
-}
-static ColorSpace toColorSpace(ui::Dataspace dataspace) {
-    switch (dataspace & HAL_DATASPACE_STANDARD_MASK) {
-        case HAL_DATASPACE_STANDARD_BT709:
-            return ColorSpace::sRGB();
-            break;
-        case HAL_DATASPACE_STANDARD_DCI_P3:
-            return ColorSpace::DisplayP3();
-            break;
-        case HAL_DATASPACE_STANDARD_BT2020:
-            return ColorSpace::BT2020();
-            break;
-        default:
-            return ColorSpace::sRGB();
-            break;
-    }
-}
-
-sk_sp<SkRuntimeEffect> buildRuntimeEffect(const LinearEffect& linearEffect) {
+sk_sp<SkRuntimeEffect> buildRuntimeEffect(const shaders::LinearEffect& linearEffect) {
     ATRACE_CALL();
-    SkString shaderString;
-    generateEOTF(linearEffect.inputDataspace, shaderString);
-    generateXYZTransforms(shaderString);
-    generateOOTF(linearEffect.inputDataspace, linearEffect.outputDataspace, shaderString);
-    generateOETF(linearEffect.outputDataspace, shaderString);
-    generateEffectiveOOTF(linearEffect.undoPremultipliedAlpha, shaderString);
+    SkString shaderString = SkString(shaders::buildLinearEffectSkSL(linearEffect));
 
     auto [shader, error] = SkRuntimeEffect::MakeForShader(shaderString);
     if (!shader) {
@@ -324,7 +40,8 @@
     return shader;
 }
 
-sk_sp<SkShader> createLinearEffectShader(sk_sp<SkShader> shader, const LinearEffect& linearEffect,
+sk_sp<SkShader> createLinearEffectShader(sk_sp<SkShader> shader,
+                                         const shaders::LinearEffect& linearEffect,
                                          sk_sp<SkRuntimeEffect> runtimeEffect,
                                          const mat4& colorTransform, float maxDisplayLuminance,
                                          float maxLuminance) {
@@ -333,27 +50,8 @@
 
     effectBuilder.child("child") = shader;
 
-    if (linearEffect.inputDataspace == linearEffect.outputDataspace) {
-        effectBuilder.uniform("in_rgbToXyz") = mat4();
-        effectBuilder.uniform("in_xyzToRgb") = colorTransform;
-    } else {
-        ColorSpace inputColorSpace = toColorSpace(linearEffect.inputDataspace);
-        ColorSpace outputColorSpace = toColorSpace(linearEffect.outputDataspace);
-
-        effectBuilder.uniform("in_rgbToXyz") = mat4(inputColorSpace.getRGBtoXYZ());
-        effectBuilder.uniform("in_xyzToRgb") =
-                colorTransform * mat4(outputColorSpace.getXYZtoRGB());
-    }
-
-    tonemap::Metadata metadata{.displayMaxLuminance = maxDisplayLuminance,
-                               // If the input luminance is unknown, use display luminance (aka,
-                               // no-op any luminance changes)
-                               // This will be the case for eg screenshots in addition to
-                               // uncalibrated displays
-                               .contentMaxLuminance =
-                                       maxLuminance > 0 ? maxLuminance : maxDisplayLuminance};
-
-    const auto uniforms = tonemap::getToneMapper()->generateShaderSkSLUniforms(metadata);
+    const auto uniforms = shaders::buildLinearEffectUniforms(linearEffect, colorTransform,
+                                                             maxDisplayLuminance, maxLuminance);
 
     for (const auto& uniform : uniforms) {
         effectBuilder.uniform(uniform.name.c_str()).set(uniform.value.data(), uniform.value.size());
diff --git a/libs/renderengine/skia/filters/LinearEffect.h b/libs/renderengine/skia/filters/LinearEffect.h
index 14a3b61..8eb6670 100644
--- a/libs/renderengine/skia/filters/LinearEffect.h
+++ b/libs/renderengine/skia/filters/LinearEffect.h
@@ -20,6 +20,7 @@
 
 #include <optional>
 
+#include <shaders/shaders.h>
 #include "SkRuntimeEffect.h"
 #include "SkShader.h"
 #include "ui/GraphicTypes.h"
@@ -28,61 +29,7 @@
 namespace renderengine {
 namespace skia {
 
-/**
- * Arguments for creating an effect that applies color transformations in linear XYZ space.
- * A linear effect is decomposed into the following steps when operating on an image:
- * 1. Electrical-Optical Transfer Function (EOTF) maps the input RGB signal into the intended
- * relative display brightness of the scene in nits for each RGB channel
- * 2. Transformation matrix from linear RGB brightness to linear XYZ, to operate on display
- * luminance.
- * 3. Opto-Optical Transfer Function (OOTF) applies a "rendering intent". This can include tone
- * mapping to display SDR content alongside HDR content, or any number of subjective transformations
- * 4. Transformation matrix from linear XYZ back to linear RGB brightness.
- * 5. Opto-Electronic Transfer Function (OETF) maps the display brightness of the scene back to
- * output RGB colors.
- *
- * For further reading, consult the recommendation in ITU-R BT.2390-4:
- * https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2390-4-2018-PDF-E.pdf
- *
- * Skia normally attempts to do its own simple tone mapping, i.e., the working color space is
- * intended to be the output surface. However, Skia does not support complex tone mapping such as
- * polynomial interpolation. As such, this filter assumes that tone mapping has not yet been applied
- * to the source colors. so that the tone mapping process is only applied once by this effect. Tone
- * mapping is applied when presenting HDR content (content with HLG or PQ transfer functions)
- * alongside other content, whereby maximum input luminance is mapped to maximum output luminance
- * and intermediate values are interpolated.
- */
-struct LinearEffect {
-    // Input dataspace of the source colors.
-    const ui::Dataspace inputDataspace = ui::Dataspace::SRGB;
-
-    // Working dataspace for the output surface, for conversion from linear space.
-    const ui::Dataspace outputDataspace = ui::Dataspace::SRGB;
-
-    // Sets whether alpha premultiplication must be undone.
-    // This is required if the source colors use premultiplied alpha and is not opaque.
-    const bool undoPremultipliedAlpha = false;
-};
-
-static inline bool operator==(const LinearEffect& lhs, const LinearEffect& rhs) {
-    return lhs.inputDataspace == rhs.inputDataspace && lhs.outputDataspace == rhs.outputDataspace &&
-            lhs.undoPremultipliedAlpha == rhs.undoPremultipliedAlpha;
-}
-
-struct LinearEffectHasher {
-    // Inspired by art/runtime/class_linker.cc
-    // Also this is what boost:hash_combine does
-    static size_t HashCombine(size_t seed, size_t val) {
-        return seed ^ (val + 0x9e3779b9 + (seed << 6) + (seed >> 2));
-    }
-    size_t operator()(const LinearEffect& le) const {
-        size_t result = std::hash<ui::Dataspace>{}(le.inputDataspace);
-        result = HashCombine(result, std::hash<ui::Dataspace>{}(le.outputDataspace));
-        return HashCombine(result, std::hash<bool>{}(le.undoPremultipliedAlpha));
-    }
-};
-
-sk_sp<SkRuntimeEffect> buildRuntimeEffect(const LinearEffect& linearEffect);
+sk_sp<SkRuntimeEffect> buildRuntimeEffect(const shaders::LinearEffect& linearEffect);
 
 // Generates a shader resulting from applying the a linear effect created from
 // LinearEffectArgs::buildEffect to an inputShader.
@@ -93,7 +40,7 @@
 // * The max luminance is provided as the max luminance for the buffer, either from the SMPTE 2086
 // or as the max light level from the CTA 861.3 standard.
 sk_sp<SkShader> createLinearEffectShader(sk_sp<SkShader> inputShader,
-                                         const LinearEffect& linearEffect,
+                                         const shaders::LinearEffect& linearEffect,
                                          sk_sp<SkRuntimeEffect> runtimeEffect,
                                          const mat4& colorTransform, float maxDisplayLuminance,
                                          float maxLuminance);
diff --git a/libs/renderengine/tests/Android.bp b/libs/renderengine/tests/Android.bp
index 52b6c8f..a426850 100644
--- a/libs/renderengine/tests/Android.bp
+++ b/libs/renderengine/tests/Android.bp
@@ -39,6 +39,7 @@
         "libgmock",
         "librenderengine",
         "librenderengine_mocks",
+        "libshaders",
         "libtonemap",
     ],
 
diff --git a/libs/shaders/Android.bp b/libs/shaders/Android.bp
new file mode 100644
index 0000000..390b228
--- /dev/null
+++ b/libs/shaders/Android.bp
@@ -0,0 +1,44 @@
+// Copyright 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_native_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_native_license"],
+}
+
+cc_library_static {
+    name: "libshaders",
+
+    export_include_dirs: ["include"],
+    local_include_dirs: ["include"],
+
+    shared_libs: [
+        "android.hardware.graphics.common-V3-ndk",
+        "android.hardware.graphics.common@1.2",
+    ],
+
+    static_libs: [
+        "libmath",
+        "libtonemap",
+        "libui-types",
+    ],
+
+    srcs: [
+        "shaders.cpp",
+    ],
+}
diff --git a/libs/shaders/OWNERS b/libs/shaders/OWNERS
new file mode 100644
index 0000000..6d91da3
--- /dev/null
+++ b/libs/shaders/OWNERS
@@ -0,0 +1,4 @@
+alecmouri@google.com
+jreck@google.com
+sallyqi@google.com
+scroggo@google.com
\ No newline at end of file
diff --git a/libs/shaders/include/shaders/shaders.h b/libs/shaders/include/shaders/shaders.h
new file mode 100644
index 0000000..712a27a
--- /dev/null
+++ b/libs/shaders/include/shaders/shaders.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <math/mat4.h>
+#include <tonemap/tonemap.h>
+#include <ui/GraphicTypes.h>
+#include <cstddef>
+
+namespace android::shaders {
+
+/**
+ * Arguments for creating an effect that applies color transformations in linear XYZ space.
+ * A linear effect is decomposed into the following steps when operating on an image:
+ * 1. Electrical-Optical Transfer Function (EOTF) maps the input RGB signal into the intended
+ * relative display brightness of the scene in nits for each RGB channel
+ * 2. Transformation matrix from linear RGB brightness to linear XYZ, to operate on display
+ * luminance.
+ * 3. Opto-Optical Transfer Function (OOTF) applies a "rendering intent". This can include tone
+ * mapping to display SDR content alongside HDR content, or any number of subjective transformations
+ * 4. Transformation matrix from linear XYZ back to linear RGB brightness.
+ * 5. Opto-Electronic Transfer Function (OETF) maps the display brightness of the scene back to
+ * output RGB colors.
+ *
+ * For further reading, consult the recommendation in ITU-R BT.2390-4:
+ * https://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BT.2390-4-2018-PDF-E.pdf
+ *
+ * Skia normally attempts to do its own simple tone mapping, i.e., the working color space is
+ * intended to be the output surface. However, Skia does not support complex tone mapping such as
+ * polynomial interpolation. As such, this filter assumes that tone mapping has not yet been applied
+ * to the source colors. so that the tone mapping process is only applied once by this effect. Tone
+ * mapping is applied when presenting HDR content (content with HLG or PQ transfer functions)
+ * alongside other content, whereby maximum input luminance is mapped to maximum output luminance
+ * and intermediate values are interpolated.
+ */
+struct LinearEffect {
+    // Input dataspace of the source colors.
+    const ui::Dataspace inputDataspace = ui::Dataspace::SRGB;
+
+    // Working dataspace for the output surface, for conversion from linear space.
+    const ui::Dataspace outputDataspace = ui::Dataspace::SRGB;
+
+    // Sets whether alpha premultiplication must be undone.
+    // This is required if the source colors use premultiplied alpha and is not opaque.
+    const bool undoPremultipliedAlpha = false;
+
+    // "Fake" dataspace of the source colors. This is used for applying an EOTF to compute linear
+    // RGB. This is used when Skia is expected to color manage the input image based on the
+    // dataspace of the provided source image and destination surface. SkRuntimeEffects use the
+    // destination color space as the working color space. RenderEngine deliberately sets the color
+    // space for input images and destination surfaces to be the same whenever LinearEffects are
+    // expected to be used so that color-management is controlled by RenderEngine, but other users
+    // of a LinearEffect may not be able to control the color space of the images and surfaces. So
+    // fakeInputDataspace is used to essentially masquerade the input dataspace to be the output
+    // dataspace for correct conversion to linear colors.
+    ui::Dataspace fakeInputDataspace = ui::Dataspace::UNKNOWN;
+};
+
+static inline bool operator==(const LinearEffect& lhs, const LinearEffect& rhs) {
+    return lhs.inputDataspace == rhs.inputDataspace && lhs.outputDataspace == rhs.outputDataspace &&
+            lhs.undoPremultipliedAlpha == rhs.undoPremultipliedAlpha &&
+            lhs.fakeInputDataspace == rhs.fakeInputDataspace;
+}
+
+struct LinearEffectHasher {
+    // Inspired by art/runtime/class_linker.cc
+    // Also this is what boost:hash_combine does
+    static size_t HashCombine(size_t seed, size_t val) {
+        return seed ^ (val + 0x9e3779b9 + (seed << 6) + (seed >> 2));
+    }
+    size_t operator()(const LinearEffect& le) const {
+        size_t result = std::hash<ui::Dataspace>{}(le.inputDataspace);
+        result = HashCombine(result, std::hash<ui::Dataspace>{}(le.outputDataspace));
+        result = HashCombine(result, std::hash<bool>{}(le.undoPremultipliedAlpha));
+        return HashCombine(result, std::hash<ui::Dataspace>{}(le.fakeInputDataspace));
+    }
+};
+
+// Generates a shader string that applies color transforms in linear space.
+// Typical use-cases supported:
+// 1. Apply tone-mapping
+// 2. Apply color transform matrices in linear space
+std::string buildLinearEffectSkSL(const LinearEffect& linearEffect);
+
+// Generates a list of uniforms to set on the LinearEffect shader above.
+std::vector<tonemap::ShaderUniform> buildLinearEffectUniforms(const LinearEffect& linearEffect,
+                                                              const mat4& colorTransform,
+                                                              float maxDisplayLuminance,
+                                                              float maxLuminance);
+
+} // namespace android::shaders
diff --git a/libs/shaders/shaders.cpp b/libs/shaders/shaders.cpp
new file mode 100644
index 0000000..ee2d4a4
--- /dev/null
+++ b/libs/shaders/shaders.cpp
@@ -0,0 +1,361 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <shaders/shaders.h>
+
+#include <tonemap/tonemap.h>
+
+#include <optional>
+
+#include <math/mat4.h>
+#include <system/graphics-base-v1.0.h>
+#include <ui/ColorSpace.h>
+
+namespace android::shaders {
+
+static aidl::android::hardware::graphics::common::Dataspace toAidlDataspace(
+        ui::Dataspace dataspace) {
+    return static_cast<aidl::android::hardware::graphics::common::Dataspace>(dataspace);
+}
+
+static void generateEOTF(ui::Dataspace dataspace, std::string& shader) {
+    switch (dataspace & HAL_DATASPACE_TRANSFER_MASK) {
+        case HAL_DATASPACE_TRANSFER_ST2084:
+            shader.append(R"(
+
+                float3 EOTF(float3 color) {
+                    float m1 = (2610.0 / 4096.0) / 4.0;
+                    float m2 = (2523.0 / 4096.0) * 128.0;
+                    float c1 = (3424.0 / 4096.0);
+                    float c2 = (2413.0 / 4096.0) * 32.0;
+                    float c3 = (2392.0 / 4096.0) * 32.0;
+
+                    float3 tmp = pow(clamp(color, 0.0, 1.0), 1.0 / float3(m2));
+                    tmp = max(tmp - c1, 0.0) / (c2 - c3 * tmp);
+                    return pow(tmp, 1.0 / float3(m1));
+                }
+            )");
+            break;
+        case HAL_DATASPACE_TRANSFER_HLG:
+            shader.append(R"(
+                float EOTF_channel(float channel) {
+                    const float a = 0.17883277;
+                    const float b = 0.28466892;
+                    const float c = 0.55991073;
+                    return channel <= 0.5 ? channel * channel / 3.0 :
+                            (exp((channel - c) / a) + b) / 12.0;
+                }
+
+                float3 EOTF(float3 color) {
+                    return float3(EOTF_channel(color.r), EOTF_channel(color.g),
+                            EOTF_channel(color.b));
+                }
+            )");
+            break;
+        case HAL_DATASPACE_TRANSFER_LINEAR:
+            shader.append(R"(
+                float3 EOTF(float3 color) {
+                    return color;
+                }
+            )");
+            break;
+        case HAL_DATASPACE_TRANSFER_SRGB:
+        default:
+            shader.append(R"(
+
+                float EOTF_sRGB(float srgb) {
+                    return srgb <= 0.04045 ? srgb / 12.92 : pow((srgb + 0.055) / 1.055, 2.4);
+                }
+
+                float3 EOTF_sRGB(float3 srgb) {
+                    return float3(EOTF_sRGB(srgb.r), EOTF_sRGB(srgb.g), EOTF_sRGB(srgb.b));
+                }
+
+                float3 EOTF(float3 srgb) {
+                    return sign(srgb.rgb) * EOTF_sRGB(abs(srgb.rgb));
+                }
+            )");
+            break;
+    }
+}
+
+static void generateXYZTransforms(std::string& shader) {
+    shader.append(R"(
+        uniform float4x4 in_rgbToXyz;
+        uniform float4x4 in_xyzToRgb;
+        float3 ToXYZ(float3 rgb) {
+            return (in_rgbToXyz * float4(rgb, 1.0)).rgb;
+        }
+
+        float3 ToRGB(float3 xyz) {
+            return clamp((in_xyzToRgb * float4(xyz, 1.0)).rgb, 0.0, 1.0);
+        }
+    )");
+}
+
+// Conversion from relative light to absolute light (maps from [0, 1] to [0, maxNits])
+static void generateLuminanceScalesForOOTF(ui::Dataspace inputDataspace,
+                                           ui::Dataspace outputDataspace, std::string& shader) {
+    switch (inputDataspace & HAL_DATASPACE_TRANSFER_MASK) {
+        case HAL_DATASPACE_TRANSFER_ST2084:
+            shader.append(R"(
+                    float3 ScaleLuminance(float3 xyz) {
+                        return xyz * 10000.0;
+                    }
+                )");
+            break;
+        case HAL_DATASPACE_TRANSFER_HLG:
+            shader.append(R"(
+                    float3 ScaleLuminance(float3 xyz) {
+                        return xyz * 1000.0 * pow(xyz.y, 0.2);
+                    }
+                )");
+            break;
+        default:
+            switch (outputDataspace & HAL_DATASPACE_TRANSFER_MASK) {
+                case HAL_DATASPACE_TRANSFER_ST2084:
+                case HAL_DATASPACE_TRANSFER_HLG:
+                    // SDR -> HDR tonemap
+                    shader.append(R"(
+                            float3 ScaleLuminance(float3 xyz) {
+                                return xyz * in_libtonemap_inputMaxLuminance;
+                            }
+                        )");
+                    break;
+                default:
+                    // Input and output are both SDR, so no tone-mapping is expected so
+                    // no-op the luminance normalization.
+                    shader.append(R"(
+                                float3 ScaleLuminance(float3 xyz) {
+                                    return xyz * in_libtonemap_displayMaxLuminance;
+                                }
+                            )");
+                    break;
+            }
+    }
+}
+
+// Normalizes from absolute light back to relative light (maps from [0, maxNits] back to [0, 1])
+static void generateLuminanceNormalizationForOOTF(ui::Dataspace outputDataspace,
+                                                  std::string& shader) {
+    switch (outputDataspace & HAL_DATASPACE_TRANSFER_MASK) {
+        case HAL_DATASPACE_TRANSFER_ST2084:
+            shader.append(R"(
+                    float3 NormalizeLuminance(float3 xyz) {
+                        return xyz / 10000.0;
+                    }
+                )");
+            break;
+        case HAL_DATASPACE_TRANSFER_HLG:
+            shader.append(R"(
+                    float3 NormalizeLuminance(float3 xyz) {
+                        return xyz / 1000.0 * pow(xyz.y / 1000.0, -0.2 / 1.2);
+                    }
+                )");
+            break;
+        default:
+            shader.append(R"(
+                    float3 NormalizeLuminance(float3 xyz) {
+                        return xyz / in_libtonemap_displayMaxLuminance;
+                    }
+                )");
+            break;
+    }
+}
+
+static void generateOOTF(ui::Dataspace inputDataspace, ui::Dataspace outputDataspace,
+                         std::string& shader) {
+    shader.append(tonemap::getToneMapper()
+                          ->generateTonemapGainShaderSkSL(toAidlDataspace(inputDataspace),
+                                                          toAidlDataspace(outputDataspace))
+                          .c_str());
+
+    generateLuminanceScalesForOOTF(inputDataspace, outputDataspace, shader);
+    generateLuminanceNormalizationForOOTF(outputDataspace, shader);
+
+    shader.append(R"(
+            float3 OOTF(float3 linearRGB, float3 xyz) {
+                float3 scaledLinearRGB = ScaleLuminance(linearRGB);
+                float3 scaledXYZ = ScaleLuminance(xyz);
+
+                float gain = libtonemap_LookupTonemapGain(scaledLinearRGB, scaledXYZ);
+
+                return NormalizeLuminance(scaledXYZ * gain);
+            }
+        )");
+}
+
+static void generateOETF(ui::Dataspace dataspace, std::string& shader) {
+    switch (dataspace & HAL_DATASPACE_TRANSFER_MASK) {
+        case HAL_DATASPACE_TRANSFER_ST2084:
+            shader.append(R"(
+
+                float3 OETF(float3 xyz) {
+                    float m1 = (2610.0 / 4096.0) / 4.0;
+                    float m2 = (2523.0 / 4096.0) * 128.0;
+                    float c1 = (3424.0 / 4096.0);
+                    float c2 = (2413.0 / 4096.0) * 32.0;
+                    float c3 = (2392.0 / 4096.0) * 32.0;
+
+                    float3 tmp = pow(xyz, float3(m1));
+                    tmp = (c1 + c2 * tmp) / (1.0 + c3 * tmp);
+                    return pow(tmp, float3(m2));
+                }
+            )");
+            break;
+        case HAL_DATASPACE_TRANSFER_HLG:
+            shader.append(R"(
+                float OETF_channel(float channel) {
+                    const float a = 0.17883277;
+                    const float b = 0.28466892;
+                    const float c = 0.55991073;
+                    return channel <= 1.0 / 12.0 ? sqrt(3.0 * channel) :
+                            a * log(12.0 * channel - b) + c;
+                }
+
+                float3 OETF(float3 linear) {
+                    return float3(OETF_channel(linear.r), OETF_channel(linear.g),
+                            OETF_channel(linear.b));
+                }
+            )");
+            break;
+        case HAL_DATASPACE_TRANSFER_LINEAR:
+            shader.append(R"(
+                float3 OETF(float3 linear) {
+                    return linear;
+                }
+            )");
+            break;
+        case HAL_DATASPACE_TRANSFER_SRGB:
+        default:
+            shader.append(R"(
+                float OETF_sRGB(float linear) {
+                    return linear <= 0.0031308 ?
+                            linear * 12.92 : (pow(linear, 1.0 / 2.4) * 1.055) - 0.055;
+                }
+
+                float3 OETF_sRGB(float3 linear) {
+                    return float3(OETF_sRGB(linear.r), OETF_sRGB(linear.g), OETF_sRGB(linear.b));
+                }
+
+                float3 OETF(float3 linear) {
+                    return sign(linear.rgb) * OETF_sRGB(abs(linear.rgb));
+                }
+            )");
+            break;
+    }
+}
+
+static void generateEffectiveOOTF(bool undoPremultipliedAlpha, std::string& shader) {
+    shader.append(R"(
+        uniform shader child;
+        half4 main(float2 xy) {
+            float4 c = float4(child.eval(xy));
+    )");
+    if (undoPremultipliedAlpha) {
+        shader.append(R"(
+            c.rgb = c.rgb / (c.a + 0.0019);
+        )");
+    }
+    shader.append(R"(
+        float3 linearRGB = EOTF(c.rgb);
+        float3 xyz = ToXYZ(linearRGB);
+        c.rgb = OETF(ToRGB(OOTF(linearRGB, xyz)));
+    )");
+    if (undoPremultipliedAlpha) {
+        shader.append(R"(
+            c.rgb = c.rgb * (c.a + 0.0019);
+        )");
+    }
+    shader.append(R"(
+            return c;
+        }
+    )");
+}
+static ColorSpace toColorSpace(ui::Dataspace dataspace) {
+    switch (dataspace & HAL_DATASPACE_STANDARD_MASK) {
+        case HAL_DATASPACE_STANDARD_BT709:
+            return ColorSpace::sRGB();
+            break;
+        case HAL_DATASPACE_STANDARD_DCI_P3:
+            return ColorSpace::DisplayP3();
+            break;
+        case HAL_DATASPACE_STANDARD_BT2020:
+            return ColorSpace::BT2020();
+            break;
+        default:
+            return ColorSpace::sRGB();
+            break;
+    }
+}
+
+std::string buildLinearEffectSkSL(const LinearEffect& linearEffect) {
+    std::string shaderString;
+    generateEOTF(linearEffect.fakeInputDataspace == ui::Dataspace::UNKNOWN
+                         ? linearEffect.inputDataspace
+                         : linearEffect.fakeInputDataspace,
+                 shaderString);
+    generateXYZTransforms(shaderString);
+    generateOOTF(linearEffect.inputDataspace, linearEffect.outputDataspace, shaderString);
+    generateOETF(linearEffect.outputDataspace, shaderString);
+    generateEffectiveOOTF(linearEffect.undoPremultipliedAlpha, shaderString);
+    return shaderString;
+}
+
+template <typename T, std::enable_if_t<std::is_trivially_copyable<T>::value, bool> = true>
+std::vector<uint8_t> buildUniformValue(T value) {
+    std::vector<uint8_t> result;
+    result.resize(sizeof(value));
+    std::memcpy(result.data(), &value, sizeof(value));
+    return result;
+}
+
+// Generates a list of uniforms to set on the LinearEffect shader above.
+std::vector<tonemap::ShaderUniform> buildLinearEffectUniforms(const LinearEffect& linearEffect,
+                                                              const mat4& colorTransform,
+                                                              float maxDisplayLuminance,
+                                                              float maxLuminance) {
+    std::vector<tonemap::ShaderUniform> uniforms;
+    if (linearEffect.inputDataspace == linearEffect.outputDataspace) {
+        uniforms.push_back({.name = "in_rgbToXyz", .value = buildUniformValue<mat4>(mat4())});
+        uniforms.push_back(
+                {.name = "in_xyzToRgb", .value = buildUniformValue<mat4>(colorTransform)});
+    } else {
+        ColorSpace inputColorSpace = toColorSpace(linearEffect.inputDataspace);
+        ColorSpace outputColorSpace = toColorSpace(linearEffect.outputDataspace);
+        uniforms.push_back({.name = "in_rgbToXyz",
+                            .value = buildUniformValue<mat4>(mat4(inputColorSpace.getRGBtoXYZ()))});
+        uniforms.push_back({.name = "in_xyzToRgb",
+                            .value = buildUniformValue<mat4>(
+                                    colorTransform * mat4(outputColorSpace.getXYZtoRGB()))});
+    }
+
+    tonemap::Metadata metadata{.displayMaxLuminance = maxDisplayLuminance,
+                               // If the input luminance is unknown, use display luminance (aka,
+                               // no-op any luminance changes)
+                               // This will be the case for eg screenshots in addition to
+                               // uncalibrated displays
+                               .contentMaxLuminance =
+                                       maxLuminance > 0 ? maxLuminance : maxDisplayLuminance};
+
+    for (const auto uniform : tonemap::getToneMapper()->generateShaderSkSLUniforms(metadata)) {
+        uniforms.push_back(uniform);
+    }
+
+    return uniforms;
+}
+
+} // namespace android::shaders
\ No newline at end of file