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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "VideoBackends/OGL/GLInterfaceBase.h"
#include "VideoBackends/OGL/SamplerCache.h"
#include "VideoCommon/DriverDetails.h"
namespace OGL
{
SamplerCache *g_sampler_cache;
SamplerCache::SamplerCache()
: m_last_max_anisotropy()
{
glGenSamplers(2, m_sampler_id);
glSamplerParameteri(m_sampler_id[0], GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glSamplerParameteri(m_sampler_id[0], GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glSamplerParameteri(m_sampler_id[0], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glSamplerParameteri(m_sampler_id[0], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glSamplerParameteri(m_sampler_id[1], GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glSamplerParameteri(m_sampler_id[1], GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glSamplerParameteri(m_sampler_id[1], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glSamplerParameteri(m_sampler_id[1], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
SamplerCache::~SamplerCache()
{
Clear();
glDeleteSamplers(2, m_sampler_id);
}
void SamplerCache::BindNearestSampler(int stage)
{
glBindSampler(stage, m_sampler_id[0]);
}
void SamplerCache::BindLinearSampler(int stage)
{
glBindSampler(stage, m_sampler_id[1]);
}
void SamplerCache::SetSamplerState(int stage, const TexMode0& tm0, const TexMode1& tm1, bool custom_tex)
{
// TODO: can this go somewhere else?
if (m_last_max_anisotropy != g_ActiveConfig.iMaxAnisotropy)
{
m_last_max_anisotropy = g_ActiveConfig.iMaxAnisotropy;
Clear();
}
Params params(tm0, tm1);
// take equivalent forced linear when bForceFiltering
if (g_ActiveConfig.bForceFiltering)
{
params.tm0.min_filter |= 0x4;
params.tm0.mag_filter |= 0x1;
}
// custom textures may have higher resolution, so disable the max_lod
if (custom_tex)
{
params.tm1.max_lod = 255;
}
// TODO: Should keep a circular buffer for each stage of recently used samplers.
auto& active_sampler = m_active_samplers[stage];
if (active_sampler.first != params || !active_sampler.second.sampler_id)
{
// Active sampler does not match parameters (or is invalid), bind the proper one.
active_sampler.first = params;
active_sampler.second = GetEntry(params);
glBindSampler(stage, active_sampler.second.sampler_id);
}
}
SamplerCache::Value& SamplerCache::GetEntry(const Params& params)
{
auto& val = m_cache[params];
if (!val.sampler_id)
{
// Sampler not found in cache, create it.
glGenSamplers(1, &val.sampler_id);
SetParameters(val.sampler_id, params);
// TODO: Maybe kill old samplers if the cache gets huge. It doesn't seem to get huge though.
//ERROR_LOG(VIDEO, "Sampler cache size is now %ld.", m_cache.size());
}
return val;
}
void SamplerCache::SetParameters(GLuint sampler_id, const Params& params)
{
static const GLint min_filters[8] =
{
GL_NEAREST,
GL_NEAREST_MIPMAP_NEAREST,
GL_NEAREST_MIPMAP_LINEAR,
GL_NEAREST,
GL_LINEAR,
GL_LINEAR_MIPMAP_NEAREST,
GL_LINEAR_MIPMAP_LINEAR,
GL_LINEAR,
};
static const GLint wrap_settings[4] =
{
GL_CLAMP_TO_EDGE,
GL_REPEAT,
GL_MIRRORED_REPEAT,
GL_REPEAT,
};
auto& tm0 = params.tm0;
auto& tm1 = params.tm1;
glSamplerParameteri(sampler_id, GL_TEXTURE_MIN_FILTER, min_filters[tm0.min_filter % ArraySize(min_filters)]);
glSamplerParameteri(sampler_id, GL_TEXTURE_MAG_FILTER, tm0.mag_filter ? GL_LINEAR : GL_NEAREST);
glSamplerParameteri(sampler_id, GL_TEXTURE_WRAP_S, wrap_settings[tm0.wrap_s]);
glSamplerParameteri(sampler_id, GL_TEXTURE_WRAP_T, wrap_settings[tm0.wrap_t]);
glSamplerParameterf(sampler_id, GL_TEXTURE_MIN_LOD, tm1.min_lod / 16.f);
glSamplerParameterf(sampler_id, GL_TEXTURE_MAX_LOD, tm1.max_lod / 16.f);
if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGL)
{
glSamplerParameterf(sampler_id, GL_TEXTURE_LOD_BIAS, (s32)tm0.lod_bias / 32.f);
if (g_ActiveConfig.iMaxAnisotropy > 0)
glSamplerParameterf(sampler_id, GL_TEXTURE_MAX_ANISOTROPY_EXT, (float)(1 << g_ActiveConfig.iMaxAnisotropy));
}
}
void SamplerCache::Clear()
{
for (auto& p : m_cache)
{
glDeleteSamplers(1, &p.second.sampler_id);
}
m_cache.clear();
}
}
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