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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
//#include <boost/functional/hash.hpp>
#include "Rendering/Shaders/ShaderStates.h"
#include "System/Sync/HsiehHash.h"
#include <unordered_set>
static std::unordered_set<int> samplerTypes{
#ifndef HEADLESS
GL_SAMPLER_1D,
GL_SAMPLER_2D,
GL_SAMPLER_3D,
GL_SAMPLER_CUBE,
GL_SAMPLER_1D_SHADOW,
GL_SAMPLER_2D_SHADOW,
GL_SAMPLER_1D_ARRAY,
GL_SAMPLER_2D_ARRAY,
GL_SAMPLER_1D_ARRAY_SHADOW,
GL_SAMPLER_2D_ARRAY_SHADOW,
GL_SAMPLER_2D_MULTISAMPLE,
GL_SAMPLER_2D_MULTISAMPLE_ARRAY,
GL_SAMPLER_CUBE_SHADOW,
GL_SAMPLER_BUFFER,
GL_SAMPLER_2D_RECT,
GL_SAMPLER_2D_RECT_SHADOW,
GL_INT_SAMPLER_1D,
GL_INT_SAMPLER_2D,
GL_INT_SAMPLER_3D,
GL_INT_SAMPLER_CUBE,
GL_INT_SAMPLER_1D_ARRAY,
GL_INT_SAMPLER_2D_ARRAY,
GL_INT_SAMPLER_2D_MULTISAMPLE,
GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY,
GL_INT_SAMPLER_BUFFER,
GL_INT_SAMPLER_2D_RECT,
GL_UNSIGNED_INT_SAMPLER_1D,
GL_UNSIGNED_INT_SAMPLER_2D,
GL_UNSIGNED_INT_SAMPLER_3D,
GL_UNSIGNED_INT_SAMPLER_CUBE,
GL_UNSIGNED_INT_SAMPLER_1D_ARRAY,
GL_UNSIGNED_INT_SAMPLER_2D_ARRAY,
GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE,
GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY,
GL_UNSIGNED_INT_SAMPLER_BUFFER,
GL_UNSIGNED_INT_SAMPLER_2D_RECT,
#endif
};
namespace Shader {
int UniformState::Hash(const int v0, const int v1, const int v2, const int v3) const
{
int hash = ~0;
hash += v0 ^ (hash * 33);
hash += v1 ^ (hash * 33);
hash += v2 ^ (hash * 33);
hash += v3 ^ (hash * 33);
return hash;
}
int UniformState::Hash(const int* v, int count) const
{
int hash = ~0;
for (int n = 0; n < count; ++n) {
hash += v[n] ^ (hash * 33);
}
return hash;
}
bool UniformState::IsLocationValid() const
{
#ifdef HEADLESS
// our stub headers are outdated and are missing GL_INVALID_INDEX
return false;
#else
return (location != GL_INVALID_INDEX);
#endif
}
#ifdef DEBUG
void UniformState::AssertType(int type) const
{
int utype = this->type;
if (samplerTypes.find(utype) != samplerTypes.end())
utype = GL_INT;
assert(type == utype || utype == -1);
}
#endif
unsigned int SShaderFlagState::GetHash()
{
if (updates != lastUpdates) {
const std::string defs = GetString();
lastUpdates = updates;
lastHash = HsiehHash(&defs[0], defs.length(), 997);
assert(lastHash != 0);
}
return lastHash;
}
}
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