third_party/blink/renderer/modules/webgl/webgl_multi_draw_instanced.h

// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_WEBGL_MULTI_DRAW_INSTANCED_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_WEBGL_MULTI_DRAW_INSTANCED_H_

#include "third_party/blink/renderer/bindings/modules/v8/int32_array_or_long_sequence.h"
#include "third_party/blink/renderer/modules/webgl/webgl_extension.h"
#include "third_party/blink/renderer/modules/webgl/webgl_multi_draw_common.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {
class WebGLMultiDrawInstanced final : public WebGLExtension,
                                      public WebGLMultiDrawCommon {
  DEFINE_WRAPPERTYPEINFO();

 public:
  static WebGLMultiDrawInstanced* Create(WebGLRenderingContextBase*);
  static bool Supported(WebGLRenderingContextBase*);
  static const char* ExtensionName();

  explicit WebGLMultiDrawInstanced(WebGLRenderingContextBase*);
  WebGLExtensionName GetName() const override;

  void multiDrawArraysInstancedWEBGL(
      GLenum mode,
      Int32ArrayOrLongSequence firstsList,
      GLuint firstsOffset,
      Int32ArrayOrLongSequence countsList,
      GLuint countsOffset,
      Int32ArrayOrLongSequence instanceCountsList,
      GLuint instanceCountsOffset,
      GLsizei drawcount) {
    multiDrawArraysInstancedImpl(mode, MakeSpan(firstsList), firstsOffset,
                                 MakeSpan(countsList), countsOffset,
                                 MakeSpan(instanceCountsList),
                                 instanceCountsOffset, drawcount);
  }

  void multiDrawElementsInstancedWEBGL(
      GLenum mode,
      Int32ArrayOrLongSequence countsList,
      GLuint countsOffset,
      GLenum type,
      Int32ArrayOrLongSequence offsetsList,
      GLuint offsetsOffset,
      Int32ArrayOrLongSequence instanceCountsList,
      GLuint instanceCountsOffset,
      GLsizei drawcount) {
    multiDrawElementsInstancedImpl(mode, MakeSpan(countsList), countsOffset,
                                   type, MakeSpan(offsetsList), offsetsOffset,
                                   MakeSpan(instanceCountsList),
                                   instanceCountsOffset, drawcount);
  }

 private:
  void multiDrawArraysInstancedImpl(
      GLenum mode,
      const base::span<const int32_t>& firsts,
      GLuint firstsOffset,
      const base::span<const int32_t>& counts,
      GLuint countsOffset,
      const base::span<const int32_t>& instanceCounts,
      GLuint instanceCountsOffset,
      GLsizei drawcount);

  void multiDrawElementsInstancedImpl(
      GLenum mode,
      const base::span<const int32_t>& counts,
      GLuint countsOffset,
      GLenum type,
      const base::span<const int32_t>& offsets,
      GLuint offsetsOffset,
      const base::span<const int32_t>& instanceCounts,
      GLuint instanceCountsOffset,
      GLsizei drawcount);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBGL_WEBGL_MULTI_DRAW_INSTANCED_H_