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#pragma once
#include "drape/drape_global.hpp"
#include "drape/graphics_context.hpp"
#include "drape/pointers.hpp"
#include "drape/render_state.hpp"
#include <functional>
#include <string>
#include <vector>
namespace dp
{
class GpuProgram;
class GraphicsContext;
class MeshObjectImpl;
namespace metal
{
class MetalMeshObjectImpl;
} // namespace metal
namespace vulkan
{
class VulkanMeshObjectImpl;
} // namespace vulkan
// This class implements a simple mesh object which does not use an index buffer.
// Use this class only for simple geometry.
class MeshObject
{
friend class MeshObjectImpl;
friend class GLMeshObjectImpl;
friend class metal::MetalMeshObjectImpl;
friend class vulkan::VulkanMeshObjectImpl;
public:
enum class DrawPrimitive: uint8_t
{
Triangles,
TriangleStrip,
LineStrip
};
MeshObject(ref_ptr<dp::GraphicsContext> context, DrawPrimitive drawPrimitive);
virtual ~MeshObject();
void SetBuffer(uint32_t bufferInd, std::vector<float> && vertices, uint32_t stride);
void SetAttribute(std::string const & attributeName, uint32_t bufferInd, uint32_t offset, uint32_t componentsCount);
void UpdateBuffer(ref_ptr<dp::GraphicsContext> context, uint32_t bufferInd, std::vector<float> && vertices);
template <typename TParamsSetter, typename TParams>
void Render(ref_ptr<dp::GraphicsContext> context, ref_ptr<dp::GpuProgram> program,
dp::RenderState const & state, ref_ptr<TParamsSetter> paramsSetter,
TParams const & params)
{
Bind(context, program);
ApplyState(context, program, state);
paramsSetter->Apply(context, program, params);
DrawPrimitives(context);
Unbind(program);
};
uint32_t GetNextBufferIndex() const { return static_cast<uint32_t>(m_buffers.size()); }
bool IsInitialized() const { return m_initialized; }
void Build(ref_ptr<dp::GraphicsContext> context, ref_ptr<dp::GpuProgram> program);
void Reset();
static std::vector<float> GenerateNormalsForTriangles(std::vector<float> const & vertices, size_t componentsCount);
private:
struct AttributeMapping
{
AttributeMapping() = default;
AttributeMapping(std::string const & attributeName, uint32_t offset, uint32_t componentsCount)
: m_offset(offset)
, m_componentsCount(componentsCount)
, m_attributeName(attributeName)
{}
uint32_t m_offset = 0;
uint32_t m_componentsCount = 0;
std::string m_attributeName;
};
struct VertexBuffer
{
VertexBuffer() = default;
VertexBuffer(std::vector<float> && data, uint32_t stride)
: m_data(std::move(data))
, m_stride(stride)
{}
std::vector<float> m_data;
uint32_t m_stride = 0;
uint32_t m_bufferId = 0;
std::vector<AttributeMapping> m_attributes;
};
void InitForOpenGL();
void InitForVulkan(ref_ptr<dp::GraphicsContext> context);
#if defined(OMIM_METAL_AVAILABLE)
// Definition of this method is in a .mm-file.
void InitForMetal();
#endif
void Bind(ref_ptr<dp::GraphicsContext> context, ref_ptr<dp::GpuProgram> program);
void Unbind(ref_ptr<dp::GpuProgram> program);
void DrawPrimitives(ref_ptr<dp::GraphicsContext> context);
std::vector<VertexBuffer> m_buffers;
DrawPrimitive m_drawPrimitive = DrawPrimitive::Triangles;
drape_ptr<MeshObjectImpl> m_impl;
bool m_initialized = false;
};
class MeshObjectImpl
{
public:
virtual ~MeshObjectImpl() = default;
virtual void Build(ref_ptr<dp::GraphicsContext> context, ref_ptr<dp::GpuProgram> program) = 0;
virtual void Reset() = 0;
virtual void UpdateBuffer(ref_ptr<dp::GraphicsContext> context, uint32_t bufferInd) = 0;
virtual void Bind(ref_ptr<dp::GpuProgram> program) = 0;
virtual void Unbind() = 0;
virtual void DrawPrimitives(ref_ptr<dp::GraphicsContext> context, uint32_t verticesCount) = 0;
};
} // namespace dp
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