Exposed SkMesh

Exposed skMesh through Mesh API, utilizing makeVertexBuffer,
makeIndexBuffer, make, and makeIndexed. Uniforms are set through
set<>Uniform methods, where the native mesh will then be updated upon
each call to set<>Uniform.

Bug: b/254354591
Test: built hwui
Change-Id: Ia100f00a1e29198e30dfd25999f8bd8db9fb3ca0

graphics/java/android/graphics/Mesh.java

@@ -0,0 +1,317 @@
+/*
+ * Copyright (C) 2022 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 android.graphics;
+
+import libcore.util.NativeAllocationRegistry;
+
+import java.nio.Buffer;
+import java.nio.ShortBuffer;
+
+/**
+ * Class representing a mesh object.
+ *
+ * This class generates Mesh objects via the
+ * {@link #make(MeshSpecification, Mode, Buffer, int, Rect)} and
+ * {@link #makeIndexed(MeshSpecification, Mode, Buffer, int, ShortBuffer, Rect)} methods,
+ * where a {@link MeshSpecification} is required along with various attributes for
+ * detailing the mesh object, including a mode, vertex buffer, optional index buffer, and bounds
+ * for the mesh.
+ *
+ * @hide
+ */
+public class Mesh {
+    private long mNativeMeshWrapper;
+    private boolean mIsIndexed;
+
+    /**
+     * Enum to determine how the mesh is represented.
+     */
+    public enum Mode {Triangles, TriangleStrip}
+
+    private static class MeshHolder {
+        public static final NativeAllocationRegistry MESH_SPECIFICATION_REGISTRY =
+                NativeAllocationRegistry.createMalloced(
+                        MeshSpecification.class.getClassLoader(), nativeGetFinalizer());
+    }
+
+    /**
+     * Generates a {@link Mesh} object.
+     *
+     * @param meshSpec     {@link MeshSpecification} used when generating the mesh.
+     * @param mode         {@link Mode} enum
+     * @param vertexBuffer vertex buffer representing through {@link Buffer}.
+     * @param vertexCount  the number of vertices represented in the vertexBuffer.
+     * @param bounds       bounds of the mesh object.
+     * @return a new Mesh object.
+     */
+    public static Mesh make(MeshSpecification meshSpec, Mode mode, Buffer vertexBuffer,
+            int vertexCount, Rect bounds) {
+        long nativeMesh = nativeMake(meshSpec.mNativeMeshSpec, mode.ordinal(), vertexBuffer,
+                vertexBuffer.isDirect(), vertexCount, vertexBuffer.position(), bounds.left,
+                bounds.top, bounds.right, bounds.bottom);
+        if (nativeMesh == 0) {
+            throw new IllegalArgumentException("Mesh construction failed.");
+        }
+        return new Mesh(nativeMesh, false);
+    }
+
+    /**
+     * Generates an indexed {@link Mesh} object.
+     *
+     * @param meshSpec     {@link MeshSpecification} used when generating the mesh.
+     * @param mode         {@link Mode} enum
+     * @param vertexBuffer vertex buffer representing through {@link Buffer}.
+     * @param vertexCount  the number of vertices represented in the vertexBuffer.
+     * @param indexBuffer  index buffer representing through {@link ShortBuffer}.
+     * @param bounds       bounds of the mesh object.
+     * @return a new Mesh object.
+     */
+    public static Mesh makeIndexed(MeshSpecification meshSpec, Mode mode, Buffer vertexBuffer,
+            int vertexCount, ShortBuffer indexBuffer, Rect bounds) {
+        long nativeMesh = nativeMakeIndexed(meshSpec.mNativeMeshSpec, mode.ordinal(), vertexBuffer,
+                vertexBuffer.isDirect(), vertexCount, vertexBuffer.position(), indexBuffer,
+                indexBuffer.isDirect(), indexBuffer.capacity(), indexBuffer.position(), bounds.left,
+                bounds.top, bounds.right, bounds.bottom);
+        if (nativeMesh == 0) {
+            throw new IllegalArgumentException("Mesh construction failed.");
+        }
+        return new Mesh(nativeMesh, true);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the color uniform declared in the shader program.
+     * @param color       the provided sRGB color will be converted into the shader program's output
+     *                    colorspace and be available as a vec4 uniform in the program.
+     */
+    public void setColorUniform(String uniformName, int color) {
+        setUniform(uniformName, Color.valueOf(color).getComponents(), true);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the color uniform declared in the shader program.
+     * @param color       the provided sRGB color will be converted into the shader program's output
+     *                    colorspace and be available as a vec4 uniform in the program.
+     */
+    public void setColorUniform(String uniformName, long color) {
+        Color exSRGB = Color.valueOf(color).convert(ColorSpace.get(ColorSpace.Named.EXTENDED_SRGB));
+        setUniform(uniformName, exSRGB.getComponents(), true);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the color uniform declared in the shader program.
+     * @param color       the provided sRGB color will be converted into the shader program's output
+     *                    colorspace and will be made available as a vec4 uniform in the program.
+     */
+    public void setColorUniform(String uniformName, Color color) {
+        if (color == null) {
+            throw new NullPointerException("The color parameter must not be null");
+        }
+
+        Color exSRGB = color.convert(ColorSpace.get(ColorSpace.Named.EXTENDED_SRGB));
+        setUniform(uniformName, exSRGB.getComponents(), true);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the float uniform declared in the shader program.
+     * @param value       float value corresponding to the float uniform with the given name.
+     */
+    public void setFloatUniform(String uniformName, float value) {
+        setFloatUniform(uniformName, value, 0.0f, 0.0f, 0.0f, 1);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the float uniform declared in the shader program.
+     * @param value1      first float value corresponding to the float uniform with the given name.
+     * @param value2      second float value corresponding to the float uniform with the given name.
+     */
+    public void setFloatUniform(String uniformName, float value1, float value2) {
+        setFloatUniform(uniformName, value1, value2, 0.0f, 0.0f, 2);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the float uniform declared in the shader program.
+     * @param value1      first float value corresponding to the float uniform with the given name.
+     * @param value2      second float value corresponding to the float uniform with the given name.
+     * @param value3      third float value corresponding to the float unifiform with the given
+     *                    name.
+     */
+    public void setFloatUniform(String uniformName, float value1, float value2, float value3) {
+        setFloatUniform(uniformName, value1, value2, value3, 0.0f, 3);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the float uniform declared in the shader program.
+     * @param value1      first float value corresponding to the float uniform with the given name.
+     * @param value2      second float value corresponding to the float uniform with the given name.
+     * @param value3      third float value corresponding to the float uniform with the given name.
+     * @param value4      fourth float value corresponding to the float uniform with the given name.
+     */
+    public void setFloatUniform(
+            String uniformName, float value1, float value2, float value3, float value4) {
+        setFloatUniform(uniformName, value1, value2, value3, value4, 4);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the float uniform declared in the shader program.
+     * @param values      float value corresponding to the vec4 float uniform with the given name.
+     */
+    public void setFloatUniform(String uniformName, float[] values) {
+        setUniform(uniformName, values, false);
+    }
+
+    private void setFloatUniform(
+            String uniformName, float value1, float value2, float value3, float value4, int count) {
+        if (uniformName == null) {
+            throw new NullPointerException("The uniformName parameter must not be null");
+        }
+        nativeUpdateUniforms(
+                mNativeMeshWrapper, uniformName, value1, value2, value3, value4, count);
+        nativeUpdateMesh(mNativeMeshWrapper);
+    }
+
+    private void setUniform(String uniformName, float[] values, boolean isColor) {
+        if (uniformName == null) {
+            throw new NullPointerException("The uniformName parameter must not be null");
+        }
+        if (values == null) {
+            throw new NullPointerException("The uniform values parameter must not be null");
+        }
+
+        nativeUpdateUniforms(mNativeMeshWrapper, uniformName, values, isColor);
+        nativeUpdateMesh(mNativeMeshWrapper);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the int uniform delcared in the shader program.
+     * @param value       value corresponding to the int uniform with the given name.
+     */
+    public void setIntUniform(String uniformName, int value) {
+        setIntUniform(uniformName, value, 0, 0, 0, 1);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the int uniform delcared in the shader program.
+     * @param value1      first value corresponding to the int uniform with the given name.
+     * @param value2      second value corresponding to the int uniform with the given name.
+     */
+    public void setIntUniform(String uniformName, int value1, int value2) {
+        setIntUniform(uniformName, value1, value2, 0, 0, 2);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the int uniform delcared in the shader program.
+     * @param value1      first value corresponding to the int uniform with the given name.
+     * @param value2      second value corresponding to the int uniform with the given name.
+     * @param value3      third value corresponding to the int uniform with the given name.
+     */
+    public void setIntUniform(String uniformName, int value1, int value2, int value3) {
+        setIntUniform(uniformName, value1, value2, value3, 0, 3);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the int uniform delcared in the shader program.
+     * @param value1      first value corresponding to the int uniform with the given name.
+     * @param value2      second value corresponding to the int uniform with the given name.
+     * @param value3      third value corresponding to the int uniform with the given name.
+     * @param value4      fourth value corresponding to the int uniform with the given name.
+     */
+    public void setIntUniform(String uniformName, int value1, int value2, int value3, int value4) {
+        setIntUniform(uniformName, value1, value2, value3, value4, 4);
+    }
+
+    /**
+     * Sets the uniform color value corresponding to the shader assigned to the mesh.
+     *
+     * @param uniformName name matching the int uniform delcared in the shader program.
+     * @param values      int values corresponding to the vec4 int uniform with the given name.
+     */
+    public void setIntUniform(String uniformName, int[] values) {
+        if (uniformName == null) {
+            throw new NullPointerException("The uniformName parameter must not be null");
+        }
+        if (values == null) {
+            throw new NullPointerException("The uniform values parameter must not be null");
+        }
+        nativeUpdateUniforms(mNativeMeshWrapper, uniformName, values);
+        nativeUpdateMesh(mNativeMeshWrapper);
+    }
+
+    private void setIntUniform(
+            String uniformName, int value1, int value2, int value3, int value4, int count) {
+        if (uniformName == null) {
+            throw new NullPointerException("The uniformName parameter must not be null");
+        }
+
+        nativeUpdateUniforms(
+                mNativeMeshWrapper, uniformName, value1, value2, value3, value4, count);
+        nativeUpdateMesh(mNativeMeshWrapper);
+    }
+
+    private Mesh(long nativeMeshWrapper, boolean isIndexed) {
+        mNativeMeshWrapper = nativeMeshWrapper;
+        this.mIsIndexed = isIndexed;
+        MeshHolder.MESH_SPECIFICATION_REGISTRY.registerNativeAllocation(this, mNativeMeshWrapper);
+    }
+
+    private static native long nativeGetFinalizer();
+
+    private static native long nativeMake(long meshSpec, int mode, Buffer vertexBuffer,
+            boolean isDirect, int vertexCount, int vertexOffset, int left, int top, int right,
+            int bottom);
+
+    private static native long nativeMakeIndexed(long meshSpec, int mode, Buffer vertexBuffer,
+            boolean isVertexDirect, int vertexCount, int vertexOffset, ShortBuffer indexBuffer,
+            boolean isIndexDirect, int indexCount, int indexOffset, int left, int top, int right,
+            int bottom);
+
+    private static native void nativeUpdateUniforms(long builder, String uniformName, float value1,
+            float value2, float value3, float value4, int count);
+
+    private static native void nativeUpdateUniforms(
+            long builder, String uniformName, float[] values, boolean isColor);
+
+    private static native void nativeUpdateUniforms(long builder, String uniformName, int value1,
+            int value2, int value3, int value4, int count);
+
+    private static native void nativeUpdateUniforms(long builder, String uniformName, int[] values);
+
+    private static native void nativeUpdateMesh(long nativeMeshWrapper);
+}

graphics/java/android/graphics/MeshSpecification.java

@@ -39,7 +39,7 @@ import libcore.util.NativeAllocationRegistry;
  * @hide
  */
 public class MeshSpecification {
-    private long mNativeMeshSpec;
+    long mNativeMeshSpec;
 
     /**
      * Constants for {@link #make(Attribute[], int, Varying[], String, String, ColorSpace, int)}

libs/hwui/jni/Mesh.cpp

@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2022 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 <GLES/gl.h>
+#include <Mesh.h>
+#include <SkMesh.h>
+
+#include "GraphicsJNI.h"
+#include "graphics_jni_helpers.h"
+
+namespace android {
+
+sk_sp<SkMesh::VertexBuffer> genVertexBuffer(JNIEnv* env, jobject buffer, int size,
+                                            jboolean isDirect) {
+    auto buff = ScopedJavaNioBuffer(env, buffer, size, isDirect);
+    auto vertexBuffer = SkMesh::MakeVertexBuffer(nullptr, buff.data(), size);
+    return vertexBuffer;
+}
+
+sk_sp<SkMesh::IndexBuffer> genIndexBuffer(JNIEnv* env, jobject buffer, int size,
+                                          jboolean isDirect) {
+    auto buff = ScopedJavaNioBuffer(env, buffer, size, isDirect);
+    auto indexBuffer = SkMesh::MakeIndexBuffer(nullptr, buff.data(), size);
+    return indexBuffer;
+}
+
+static jlong make(JNIEnv* env, jobject, jlong meshSpec, jint mode, jobject vertexBuffer,
+                  jboolean isDirect, jint vertexCount, jint vertexOffset, jint left, jint top,
+                  jint right, jint bottom) {
+    auto skMeshSpec = sk_ref_sp(reinterpret_cast<SkMeshSpecification*>(meshSpec));
+    sk_sp<SkMesh::VertexBuffer> skVertexBuffer =
+            genVertexBuffer(env, vertexBuffer, skMeshSpec->attributes().size_bytes(), isDirect);
+    auto skRect = SkRect::MakeLTRB(left, top, right, bottom);
+    auto mesh = SkMesh::Make(skMeshSpec, SkMesh::Mode(mode), skVertexBuffer, vertexCount,
+                             vertexOffset, nullptr, skRect);
+    auto meshPtr = std::make_unique<MeshWrapper>(MeshWrapper{mesh, MeshUniformBuilder(skMeshSpec)});
+    return reinterpret_cast<jlong>(meshPtr.release());
+}
+
+static jlong makeIndexed(JNIEnv* env, jobject, jlong meshSpec, jint mode, jobject vertexBuffer,
+                         jboolean isVertexDirect, jint vertexCount, jint vertexOffset,
+                         jobject indexBuffer, jboolean isIndexDirect, jint indexCount,
+                         jint indexOffset, jint left, jint top, jint right, jint bottom) {
+    auto skMeshSpec = sk_ref_sp(reinterpret_cast<SkMeshSpecification*>(meshSpec));
+    sk_sp<SkMesh::VertexBuffer> skVertexBuffer = genVertexBuffer(
+            env, vertexBuffer, skMeshSpec->attributes().size_bytes(), isVertexDirect);
+    sk_sp<SkMesh::IndexBuffer> skIndexBuffer =
+            genIndexBuffer(env, indexBuffer, indexCount * gIndexByteSize, isIndexDirect);
+    auto skRect = SkRect::MakeLTRB(left, top, right, bottom);
+    auto mesh = SkMesh::MakeIndexed(skMeshSpec, SkMesh::Mode(mode), skVertexBuffer, vertexCount,
+                                    vertexOffset, skIndexBuffer, indexCount, indexOffset, nullptr,
+                                    skRect);
+    auto meshPtr = std::make_unique<MeshWrapper>(MeshWrapper{mesh, MeshUniformBuilder(skMeshSpec)});
+    return reinterpret_cast<jlong>(meshPtr.release());
+}
+
+static void updateMesh(JNIEnv* env, jobject, jlong meshWrapper, jboolean indexed) {
+    auto wrapper = reinterpret_cast<MeshWrapper*>(meshWrapper);
+    auto mesh = wrapper->mesh;
+    if (indexed) {
+        wrapper->mesh = SkMesh::MakeIndexed(
+                sk_ref_sp(mesh.spec()), mesh.mode(), sk_ref_sp(mesh.vertexBuffer()),
+                mesh.vertexCount(), mesh.vertexOffset(), sk_ref_sp(mesh.indexBuffer()),
+                mesh.indexCount(), mesh.indexOffset(), wrapper->builder.fUniforms, mesh.bounds());
+    } else {
+        wrapper->mesh = SkMesh::Make(
+                sk_ref_sp(mesh.spec()), mesh.mode(), sk_ref_sp(mesh.vertexBuffer()),
+                mesh.vertexCount(), mesh.vertexOffset(), wrapper->builder.fUniforms, mesh.bounds());
+    }
+}
+
+static inline int ThrowIAEFmt(JNIEnv* env, const char* fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    int ret = jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException", fmt, args);
+    va_end(args);
+    return ret;
+}
+
+static bool isIntUniformType(const SkRuntimeEffect::Uniform::Type& type) {
+    switch (type) {
+        case SkRuntimeEffect::Uniform::Type::kFloat:
+        case SkRuntimeEffect::Uniform::Type::kFloat2:
+        case SkRuntimeEffect::Uniform::Type::kFloat3:
+        case SkRuntimeEffect::Uniform::Type::kFloat4:
+        case SkRuntimeEffect::Uniform::Type::kFloat2x2:
+        case SkRuntimeEffect::Uniform::Type::kFloat3x3:
+        case SkRuntimeEffect::Uniform::Type::kFloat4x4:
+            return false;
+        case SkRuntimeEffect::Uniform::Type::kInt:
+        case SkRuntimeEffect::Uniform::Type::kInt2:
+        case SkRuntimeEffect::Uniform::Type::kInt3:
+        case SkRuntimeEffect::Uniform::Type::kInt4:
+            return true;
+    }
+}
+
+static void nativeUpdateFloatUniforms(JNIEnv* env, MeshUniformBuilder* builder,
+                                      const char* uniformName, const float values[], int count,
+                                      bool isColor) {
+    MeshUniformBuilder::MeshUniform uniform = builder->uniform(uniformName);
+    if (uniform.fVar == nullptr) {
+        ThrowIAEFmt(env, "unable to find uniform named %s", uniformName);
+    } else if (isColor != ((uniform.fVar->flags & SkRuntimeEffect::Uniform::kColor_Flag) != 0)) {
+        if (isColor) {
+            jniThrowExceptionFmt(
+                    env, "java/lang/IllegalArgumentException",
+                    "attempting to set a color uniform using the non-color specific APIs: %s %x",
+                    uniformName, uniform.fVar->flags);
+        } else {
+            ThrowIAEFmt(env,
+                        "attempting to set a non-color uniform using the setColorUniform APIs: %s",
+                        uniformName);
+        }
+    } else if (isIntUniformType(uniform.fVar->type)) {
+        ThrowIAEFmt(env, "attempting to set a int uniform using the setUniform APIs: %s",
+                    uniformName);
+    } else if (!uniform.set<float>(values, count)) {
+        ThrowIAEFmt(env, "mismatch in byte size for uniform [expected: %zu actual: %zu]",
+                    uniform.fVar->sizeInBytes(), sizeof(float) * count);
+    }
+}
+
+static void updateFloatUniforms(JNIEnv* env, jobject, jlong uniBuilder, jstring uniformName,
+                                jfloat value1, jfloat value2, jfloat value3, jfloat value4,
+                                jint count) {
+    auto* builder = reinterpret_cast<MeshUniformBuilder*>(uniBuilder);
+    ScopedUtfChars name(env, uniformName);
+    const float values[4] = {value1, value2, value3, value4};
+    nativeUpdateFloatUniforms(env, builder, name.c_str(), values, count, false);
+}
+
+static void updateFloatArrayUniforms(JNIEnv* env, jobject, jlong uniBuilder, jstring jUniformName,
+                                     jfloatArray jvalues, jboolean isColor) {
+    auto builder = reinterpret_cast<MeshUniformBuilder*>(uniBuilder);
+    ScopedUtfChars name(env, jUniformName);
+    AutoJavaFloatArray autoValues(env, jvalues, 0, kRO_JNIAccess);
+    nativeUpdateFloatUniforms(env, builder, name.c_str(), autoValues.ptr(), autoValues.length(),
+                              isColor);
+}
+
+static void nativeUpdateIntUniforms(JNIEnv* env, MeshUniformBuilder* builder,
+                                    const char* uniformName, const int values[], int count) {
+    MeshUniformBuilder::MeshUniform uniform = builder->uniform(uniformName);
+    if (uniform.fVar == nullptr) {
+        ThrowIAEFmt(env, "unable to find uniform named %s", uniformName);
+    } else if (!isIntUniformType(uniform.fVar->type)) {
+        ThrowIAEFmt(env, "attempting to set a non-int uniform using the setIntUniform APIs: %s",
+                    uniformName);
+    } else if (!uniform.set<int>(values, count)) {
+        ThrowIAEFmt(env, "mismatch in byte size for uniform [expected: %zu actual: %zu]",
+                    uniform.fVar->sizeInBytes(), sizeof(float) * count);
+    }
+}
+
+static void updateIntUniforms(JNIEnv* env, jobject, jlong uniBuilder, jstring uniformName,
+                              jint value1, jint value2, jint value3, jint value4, jint count) {
+    auto builder = reinterpret_cast<MeshUniformBuilder*>(uniBuilder);
+    ScopedUtfChars name(env, uniformName);
+    const int values[4] = {value1, value2, value3, value4};
+    nativeUpdateIntUniforms(env, builder, name.c_str(), values, count);
+}
+
+static void updateIntArrayUniforms(JNIEnv* env, jobject, jlong uniBuilder, jstring uniformName,
+                                   jintArray values) {
+    auto builder = reinterpret_cast<MeshUniformBuilder*>(uniBuilder);
+    ScopedUtfChars name(env, uniformName);
+    AutoJavaIntArray autoValues(env, values, 0);
+    nativeUpdateIntUniforms(env, builder, name.c_str(), autoValues.ptr(), autoValues.length());
+}
+
+static void MeshWrapper_destroy(MeshWrapper* wrapper) {
+    delete wrapper;
+}
+
+static jlong getMeshFinalizer(JNIEnv*, jobject) {
+    return static_cast<jlong>(reinterpret_cast<uintptr_t>(&MeshWrapper_destroy));
+}
+
+static const JNINativeMethod gMeshMethods[] = {
+        {"nativeGetFinalizer", "()J", (void*)getMeshFinalizer},
+        {"nativeMake", "(JILjava/nio/Buffer;ZIIIIII)J", (void*)make},
+        {"nativeMakeIndexed", "(JILjava/nio/Buffer;ZIILjava/nio/ShortBuffer;ZIIIIII)J",
+         (void*)makeIndexed},
+        {"nativeUpdateMesh", "(JZ)V", (void*)updateMesh},
+        {"nativeUpdateUniforms", "(JLjava/lang/String;[FZ)V", (void*)updateFloatArrayUniforms},
+        {"nativeUpdateUniforms", "(JLjava/lang/String;FFFFI)V", (void*)updateFloatUniforms},
+        {"nativeUpdateUniforms", "(JLjava/lang/String;[I)V", (void*)updateIntArrayUniforms},
+        {"nativeUpdateUniforms", "(JLjava/lang/String;IIIII)V", (void*)updateIntUniforms}};
+
+int register_android_graphics_Mesh(JNIEnv* env) {
+    android::RegisterMethodsOrDie(env, "android/graphics/Mesh", gMeshMethods, NELEM(gMeshMethods));
+    return 0;
+}
+
+}  // namespace android

libs/hwui/jni/Mesh.h

@@ -0,0 +1,261 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+#ifndef FRAMEWORKS_BASE_LIBS_HWUI_JNI_MESH_H_
+#define FRAMEWORKS_BASE_LIBS_HWUI_JNI_MESH_H_
+
+#include <SkMesh.h>
+#include <jni.h>
+
+#include <utility>
+
+#include "graphics_jni_helpers.h"
+
+#define gIndexByteSize 2
+
+// A smart pointer that provides read only access to Java.nio.Buffer. This handles both
+// direct and indrect buffers, allowing access to the underlying data in both
+// situations. If passed a null buffer, we will throw NullPointerException,
+// and c_data will return nullptr.
+//
+// This class draws from com_google_android_gles_jni_GLImpl.cpp for Buffer to void *
+// conversion.
+class ScopedJavaNioBuffer {
+public:
+    ScopedJavaNioBuffer(JNIEnv* env, jobject buffer, jint size, jboolean isDirect)
+            : mEnv(env), mBuffer(buffer) {
+        if (buffer == nullptr) {
+            mDataBase = nullptr;
+            mData = nullptr;
+            jniThrowNullPointerException(env);
+        } else {
+            mArray = (jarray) nullptr;
+            if (isDirect) {
+                mData = getDirectBufferPointer(mEnv, mBuffer);
+            } else {
+                mData = setIndirectData(size);
+            }
+        }
+    }
+
+    ScopedJavaNioBuffer(ScopedJavaNioBuffer&& rhs) noexcept { *this = std::move(rhs); }
+
+    ~ScopedJavaNioBuffer() { reset(); }
+
+    void reset() {
+        if (mDataBase) {
+            releasePointer(mEnv, mArray, mDataBase, JNI_FALSE);
+            mDataBase = nullptr;
+        }
+    }
+
+    ScopedJavaNioBuffer& operator=(ScopedJavaNioBuffer&& rhs) noexcept {
+        if (this != &rhs) {
+            reset();
+
+            mEnv = rhs.mEnv;
+            mBuffer = rhs.mBuffer;
+            mDataBase = rhs.mDataBase;
+            mData = rhs.mData;
+            mArray = rhs.mArray;
+            rhs.mEnv = nullptr;
+            rhs.mData = nullptr;
+            rhs.mBuffer = nullptr;
+            rhs.mArray = nullptr;
+            rhs.mDataBase = nullptr;
+        }
+        return *this;
+    }
+
+    const void* data() const { return mData; }
+
+private:
+    /**
+     * This code is taken and modified from com_google_android_gles_jni_GLImpl.cpp to extract data
+     * from a java.nio.Buffer.
+     */
+    void* getDirectBufferPointer(JNIEnv* env, jobject buffer) {
+        if (buffer == nullptr) {
+            return nullptr;
+        }
+
+        jint position;
+        jint limit;
+        jint elementSizeShift;
+        jlong pointer;
+        pointer = jniGetNioBufferFields(env, buffer, &position, &limit, &elementSizeShift);
+        if (pointer == 0) {
+            jniThrowException(mEnv, "java/lang/IllegalArgumentException",
+                              "Must use a native order direct Buffer");
+            return nullptr;
+        }
+        pointer += position << elementSizeShift;
+        return reinterpret_cast<void*>(pointer);
+    }
+
+    static void releasePointer(JNIEnv* env, jarray array, void* data, jboolean commit) {
+        env->ReleasePrimitiveArrayCritical(array, data, commit ? 0 : JNI_ABORT);
+    }
+
+    static void* getPointer(JNIEnv* env, jobject buffer, jarray* array, jint* remaining,
+                            jint* offset) {
+        jint position;
+        jint limit;
+        jint elementSizeShift;
+
+        jlong pointer;
+        pointer = jniGetNioBufferFields(env, buffer, &position, &limit, &elementSizeShift);
+        *remaining = (limit - position) << elementSizeShift;
+        if (pointer != 0L) {
+            *array = nullptr;
+            pointer += position << elementSizeShift;
+            return reinterpret_cast<void*>(pointer);
+        }
+
+        *array = jniGetNioBufferBaseArray(env, buffer);
+        *offset = jniGetNioBufferBaseArrayOffset(env, buffer);
+        return nullptr;
+    }
+
+    /**
+     * This is a copy of
+     * static void android_glBufferData__IILjava_nio_Buffer_2I
+     * from com_google_android_gles_jni_GLImpl.cpp
+     */
+    void* setIndirectData(jint size) {
+        jint exception;
+        const char* exceptionType;
+        const char* exceptionMessage;
+        jint bufferOffset = (jint)0;
+        jint remaining;
+        void* tempData;
+
+        if (mBuffer) {
+            tempData =
+                    (void*)getPointer(mEnv, mBuffer, (jarray*)&mArray, &remaining, &bufferOffset);
+            if (remaining < size) {
+                exception = 1;
+                exceptionType = "java/lang/IllegalArgumentException";
+                exceptionMessage = "remaining() < size < needed";
+                goto exit;
+            }
+        }
+        if (mBuffer && tempData == nullptr) {
+            mDataBase = (char*)mEnv->GetPrimitiveArrayCritical(mArray, (jboolean*)0);
+            tempData = (void*)(mDataBase + bufferOffset);
+        }
+        return tempData;
+    exit:
+        if (mArray) {
+            releasePointer(mEnv, mArray, (void*)(mDataBase), JNI_FALSE);
+        }
+        if (exception) {
+            jniThrowException(mEnv, exceptionType, exceptionMessage);
+        }
+        return nullptr;
+    }
+
+    JNIEnv* mEnv;
+
+    // Java Buffer data
+    void* mData;
+    jobject mBuffer;
+
+    // Indirect Buffer Data
+    jarray mArray;
+    char* mDataBase;
+};
+
+class MeshUniformBuilder {
+public:
+    struct MeshUniform {
+        template <typename T>
+        std::enable_if_t<std::is_trivially_copyable<T>::value, MeshUniform> operator=(
+                const T& val) {
+            if (!fVar) {
+                SkDEBUGFAIL("Assigning to missing variable");
+            } else if (sizeof(val) != fVar->sizeInBytes()) {
+                SkDEBUGFAIL("Incorrect value size");
+            } else {
+                memcpy(SkTAddOffset<void>(fOwner->writableUniformData(), fVar->offset), &val,
+                       szeof(val));
+            }
+        }
+
+        MeshUniform& operator=(const SkMatrix& val) {
+            if (!fVar) {
+                SkDEBUGFAIL("Assigning to missing variable");
+            } else if (fVar->sizeInBytes() != 9 * sizeof(float)) {
+                SkDEBUGFAIL("Incorrect value size");
+            } else {
+                float* data =
+                        SkTAddOffset<float>(fOwner->writableUniformData(), (ptrdiff_t)fVar->offset);
+                data[0] = val.get(0);
+                data[1] = val.get(3);
+                data[2] = val.get(6);
+                data[3] = val.get(1);
+                data[4] = val.get(4);
+                data[5] = val.get(7);
+                data[6] = val.get(2);
+                data[7] = val.get(5);
+                data[8] = val.get(8);
+            }
+            return *this;
+        }
+
+        template <typename T>
+        bool set(const T val[], const int count) {
+            static_assert(std::is_trivially_copyable<T>::value, "Value must be trivial copyable");
+            if (!fVar) {
+                SkDEBUGFAIL("Assigning to missing variable");
+                return false;
+            } else if (sizeof(T) * count != fVar->sizeInBytes()) {
+                SkDEBUGFAIL("Incorrect value size");
+                return false;
+            } else {
+                memcpy(SkTAddOffset<void>(fOwner->writableUniformData(), fVar->offset), val,
+                       sizeof(T) * count);
+            }
+            return true;
+        }
+
+        MeshUniformBuilder* fOwner;
+        const SkRuntimeEffect::Uniform* fVar;
+    };
+    MeshUniform uniform(std::string_view name) { return {this, fMeshSpec->findUniform(name)}; }
+
+    explicit MeshUniformBuilder(sk_sp<SkMeshSpecification> meshSpec) {
+        fMeshSpec = sk_sp(meshSpec);
+    }
+
+    sk_sp<SkData> fUniforms;
+
+private:
+    void* writableUniformData() {
+        if (!fUniforms->unique()) {
+            fUniforms = SkData::MakeWithCopy(fUniforms->data(), fUniforms->size());
+        }
+        return fUniforms->writable_data();
+    }
+
+    sk_sp<SkMeshSpecification> fMeshSpec;
+};
+
+struct MeshWrapper {
+    SkMesh mesh;
+    MeshUniformBuilder builder;
+};
+#endif  // FRAMEWORKS_BASE_LIBS_HWUI_JNI_MESH_H_