Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 127 insertions, 0 deletions

diff --git a/dom/canvas/WebGLVertexArray.h b/dom/canvas/WebGLVertexArray.h
new file mode 100644
index 0000000000..70f31f1d84
--- /dev/null
+++ b/dom/canvas/WebGLVertexArray.h
@@ -0,0 +1,127 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WEBGL_VERTEX_ARRAY_H_
+#define WEBGL_VERTEX_ARRAY_H_
+
+#include <array>
+#include <bitset>
+#include <vector>
+
+#include "mozilla/IntegerRange.h"
+
+#include "CacheInvalidator.h"
+#include "WebGLObjectModel.h"
+#include "WebGLStrongTypes.h"
+
+namespace mozilla {
+
+class WebGLBuffer;
+class WebGLVertexArrayFake;
+
+namespace webgl {
+struct LinkedProgramInfo;
+
+struct VertAttribLayoutData final {
+  // Keep this packed tightly!
+  uint32_t divisor = 0;
+  bool isArray = false;
+  uint8_t byteSize = 0;
+  uint8_t byteStride = 1;  // Non-zero, at-most 255
+  webgl::AttribBaseType baseType = webgl::AttribBaseType::Float;
+  uint64_t byteOffset = 0;
+};
+
+struct VertAttribBindingData final {
+  VertAttribLayoutData layout;
+  RefPtr<WebGLBuffer> buffer;
+};
+
+}  // namespace webgl
+
+void DoVertexAttribPointer(gl::GLContext&, uint32_t index,
+                           const webgl::VertAttribPointerDesc&);
+
+class WebGLVertexArray : public WebGLContextBoundObject {
+  friend class ScopedDrawHelper;
+  friend class WebGLContext;
+  friend class WebGLVertexArrayFake;
+  friend class WebGL2Context;
+  friend struct webgl::LinkedProgramInfo;
+
+  static constexpr size_t kMaxAttribs = 32;  // gpuinfo.org says so
+
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(WebGLVertexArray, override)
+
+  RefPtr<WebGLBuffer> mElementArrayBuffer;
+
+  std::array<webgl::VertAttribBindingData, kMaxAttribs> mBindings;  // Hot data.
+  std::array<webgl::VertAttribPointerDesc, kMaxAttribs>
+      mDescs;  // cold data, parallel to mBindings.
+
+  std::bitset<kMaxAttribs> mAttribIsArrayWithNullBuffer;
+  bool mHasBeenBound = false;
+
+ public:
+  static WebGLVertexArray* Create(WebGLContext* webgl);
+
+ protected:
+  explicit WebGLVertexArray(WebGLContext* webgl);
+  ~WebGLVertexArray();
+
+ public:
+  virtual void BindVertexArray() = 0;
+
+  void SetAttribIsArray(const uint32_t index, const bool val) {
+    auto& binding = mBindings.at(index);
+    binding.layout.isArray = val;
+    mAttribIsArrayWithNullBuffer[index] =
+        binding.layout.isArray && !binding.buffer;
+  }
+
+  void AttribDivisor(const uint32_t index, const uint32_t val) {
+    auto& binding = mBindings.at(index);
+    binding.layout.divisor = val;
+  }
+
+  void AttribPointer(const uint32_t index, WebGLBuffer* const buffer,
+                     const webgl::VertAttribPointerDesc& desc,
+                     const webgl::VertAttribPointerCalculated& calc) {
+    mDescs[index] = desc;
+
+    auto& binding = mBindings.at(index);
+    binding.buffer = buffer;
+    binding.layout.byteSize = calc.byteSize;
+    binding.layout.byteStride = calc.byteStride;
+    binding.layout.baseType = calc.baseType;
+    binding.layout.byteOffset = desc.byteOffset;
+
+    mAttribIsArrayWithNullBuffer[index] =
+        binding.layout.isArray && !binding.buffer;
+  }
+
+  const auto& AttribBinding(const uint32_t index) const {
+    return mBindings.at(index);
+  }
+  const auto& AttribDesc(const uint32_t index) const {
+    return mDescs.at(index);
+  }
+
+  Maybe<uint32_t> GetAttribIsArrayWithNullBuffer() const {
+    const auto& bitset = mAttribIsArrayWithNullBuffer;
+    if (MOZ_LIKELY(bitset.none())) return {};
+    for (const auto i : IntegerRange(bitset.size())) {
+      if (bitset[i]) return Some(i);
+    }
+    MOZ_CRASH();
+  }
+
+  Maybe<double> GetVertexAttrib(uint32_t index, GLenum pname) const;
+  void DoVertexAttrib(uint32_t index, uint32_t vertOffset = 0) const;
+};
+
+}  // namespace mozilla
+
+#endif  // WEBGL_VERTEX_ARRAY_H_