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#pragma once
#ifndef DOXYGEN_GENERATING_OUTPUT
#define NCINE_INCLUDE_OPENGL
#include "../../CommonHeaders.h"
#endif
#include "../../../Main.h"
namespace nCine
{
using key_t = GLenum;
using value_t = GLuint;
/// Naive implementation of a hashmap for storing pairs of OpenGL targets and object IDs
template<std::uint32_t S, class MappingFunc>
class GLHashMap
{
public:
GLHashMap();
/// Returns the bucket index using the mapping function on the key
value_t& operator[](key_t key);
private:
value_t buckets_[S];
MappingFunc mappingFunc;
};
template<std::uint32_t S, class MappingFunc>
GLHashMap<S, MappingFunc>::GLHashMap()
{
// Initializing with a null OpenGL object id
for (std::uint32_t i = 0; i < S; i++)
buckets_[i] = 0;
}
template<std::uint32_t S, class MappingFunc>
inline value_t& GLHashMap<S, MappingFunc>::operator[](key_t key)
{
return buckets_[mappingFunc(key)];
}
/// Performs a mapping between OpenGL buffer object targets and array indices
class GLBufferObjectMappingFunc
{
public:
static const std::uint32_t Size = 6;
inline std::uint32_t operator()(key_t key) const
{
std::uint32_t value = 0;
switch (key) {
case GL_ARRAY_BUFFER:
value = 0;
break;
case GL_ELEMENT_ARRAY_BUFFER:
value = 1;
break;
case GL_UNIFORM_BUFFER:
value = 2;
break;
case GL_PIXEL_PACK_BUFFER:
value = 3;
break;
case GL_PIXEL_UNPACK_BUFFER:
value = 4;
break;
#if !defined(WITH_OPENGLES) || (defined(WITH_OPENGLES) && GL_ES_VERSION_3_2)
case GL_TEXTURE_BUFFER:
value = 5;
break;
#endif
default:
LOGF("No available case to handle buffer object target: 0x{:x}", key);
break;
}
return value;
}
};
/// Performs a mapping between OpenGL texture targets and array indices
class GLTextureMappingFunc
{
public:
static const std::uint32_t Size = 4;
inline std::uint32_t operator()(key_t key) const
{
std::uint32_t value = 0;
switch (key) {
#if !defined(WITH_OPENGLES) // not available in OpenGL ES
case GL_TEXTURE_1D:
value = 0;
break;
#endif
case GL_TEXTURE_2D:
value = 1;
break;
case GL_TEXTURE_3D:
value = 2;
break;
#if !defined(WITH_OPENGLES) || (defined(WITH_OPENGLES) && GL_ES_VERSION_3_2)
case GL_TEXTURE_BUFFER:
value = 3;
break;
#endif
default:
LOGF("No available case to handle texture target: 0x{:x}", key);
break;
}
return value;
}
};
}
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