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/* -*- 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_
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