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// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0
#ifndef OPENVDB_VIEWER_RENDERMODULES_HAS_BEEN_INCLUDED
#define OPENVDB_VIEWER_RENDERMODULES_HAS_BEEN_INCLUDED
#include <openvdb/openvdb.h>
#include <openvdb/tools/VolumeToMesh.h>
#include <openvdb/tools/MeshToVolume.h>
#include <openvdb/tools/PointScatter.h>
#include <openvdb/tree/LeafManager.h>
#include <openvdb/math/Operators.h>
#include <string>
#include <vector>
#if defined(__APPLE__) || defined(MACOSX)
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#elif defined(_WIN32)
#include <GL/glew.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif
namespace openvdb_viewer {
// OpenGL helper objects
class BufferObject
{
public:
BufferObject();
~BufferObject();
void render() const;
/// @note accepted @c primType: GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP,
/// GL_LINES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES,
/// GL_QUAD_STRIP, GL_QUADS and GL_POLYGON
void genIndexBuffer(const std::vector<GLuint>&, GLenum primType);
void genVertexBuffer(const std::vector<GLfloat>&);
void genNormalBuffer(const std::vector<GLfloat>&);
void genColorBuffer(const std::vector<GLfloat>&);
void clear();
private:
GLuint mVertexBuffer, mNormalBuffer, mIndexBuffer, mColorBuffer;
GLenum mPrimType;
GLsizei mPrimNum;
};
class ShaderProgram
{
public:
ShaderProgram();
~ShaderProgram();
void setVertShader(const std::string&);
void setFragShader(const std::string&);
void build();
void build(const std::vector<GLchar*>& attributes);
void startShading() const;
void stopShading() const;
void clear();
private:
GLuint mProgram, mVertShader, mFragShader;
};
////////////////////////////////////////
/// @brief interface class
class RenderModule
{
public:
virtual ~RenderModule() {}
virtual void render() = 0;
bool visible() { return mIsVisible; }
void setVisible(bool b) { mIsVisible = b; }
protected:
RenderModule(): mIsVisible(true) {}
bool mIsVisible;
};
////////////////////////////////////////
/// @brief Basic render module, axis gnomon and ground plane.
class ViewportModule: public RenderModule
{
public:
ViewportModule();
~ViewportModule() override = default;
void render() override;
private:
float mAxisGnomonScale, mGroundPlaneScale;
};
////////////////////////////////////////
/// @brief Tree topology render module
class TreeTopologyModule: public RenderModule
{
public:
TreeTopologyModule(const openvdb::GridBase::ConstPtr&);
~TreeTopologyModule() override = default;
void render() override;
private:
void init();
const openvdb::GridBase::ConstPtr& mGrid;
BufferObject mBufferObject;
bool mIsInitialized;
ShaderProgram mShader;
};
////////////////////////////////////////
/// @brief Module to render active voxels as points
class VoxelModule: public RenderModule
{
public:
VoxelModule(const openvdb::GridBase::ConstPtr&);
~VoxelModule() override = default;
void render() override;
private:
void init();
const openvdb::GridBase::ConstPtr& mGrid;
BufferObject mInteriorBuffer, mSurfaceBuffer, mVectorBuffer;
bool mIsInitialized;
ShaderProgram mFlatShader, mSurfaceShader;
bool mDrawingPointGrid;
};
////////////////////////////////////////
/// @brief Surfacing render module
class MeshModule: public RenderModule
{
public:
MeshModule(const openvdb::GridBase::ConstPtr&);
~MeshModule() override = default;
void render() override;
private:
void init();
const openvdb::GridBase::ConstPtr& mGrid;
BufferObject mBufferObject;
bool mIsInitialized;
ShaderProgram mShader;
};
} // namespace openvdb_viewer
#endif // OPENVDB_VIEWER_RENDERMODULES_HAS_BEEN_INCLUDED
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