VideoBackends: Move SamplerState to common

1 files changed, 58 insertions, 93 deletions

diff --git a/Source/Core/VideoBackends/OGL/SamplerCache.cpp b/Source/Core/VideoBackends/OGL/SamplerCache.cpp
index cbde39be6c..59d3d3a842 100644
--- a/Source/Core/VideoBackends/OGL/SamplerCache.cpp
+++ b/Source/Core/VideoBackends/OGL/SamplerCache.cpp
@@ -15,141 +15,106 @@ namespace OGL
 {
 std::unique_ptr<SamplerCache> g_sampler_cache;
 
-SamplerCache::SamplerCache() : m_last_max_anisotropy()
+SamplerCache::SamplerCache()
 {
-  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);
+  glGenSamplers(1, &m_point_sampler);
+  glGenSamplers(1, &m_linear_sampler);
+  glSamplerParameteri(m_point_sampler, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glSamplerParameteri(m_point_sampler, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glSamplerParameteri(m_point_sampler, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glSamplerParameteri(m_point_sampler, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  glSamplerParameteri(m_linear_sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glSamplerParameteri(m_linear_sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glSamplerParameteri(m_linear_sampler, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glSamplerParameteri(m_linear_sampler, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 }
 
 SamplerCache::~SamplerCache()
 {
   Clear();
-  glDeleteSamplers(2, m_sampler_id);
+  glDeleteSamplers(1, &m_point_sampler);
+  glDeleteSamplers(1, &m_linear_sampler);
 }
 
 void SamplerCache::BindNearestSampler(int stage)
 {
-  glBindSampler(stage, m_sampler_id[0]);
+  glBindSampler(stage, m_point_sampler);
 }
 
 void SamplerCache::BindLinearSampler(int stage)
 {
-  glBindSampler(stage, m_sampler_id[1]);
+  glBindSampler(stage, m_linear_sampler);
 }
 
-void SamplerCache::SetSamplerState(int stage, const TexMode0& tm0, const TexMode1& tm1,
-                                   bool custom_tex)
+void SamplerCache::SetSamplerState(u32 stage, const SamplerState& state)
 {
-  // TODO: can this go somewhere else?
-  if (m_last_max_anisotropy != g_ActiveConfig.iMaxAnisotropy)
-  {
-    m_last_max_anisotropy = g_ActiveConfig.iMaxAnisotropy;
-    Clear();
-  }
+  if (m_active_samplers[stage].first == state && m_active_samplers[stage].second != 0)
+    return;
 
-  Params params(tm0, tm1);
-
-  // take equivalent forced linear when bForceFiltering
-  if (g_ActiveConfig.bForceFiltering)
+  auto it = m_cache.find(state);
+  if (it == m_cache.end())
   {
-    params.tm0.min_filter = SamplerCommon::AreBpTexMode0MipmapsEnabled(tm0) ? 6 : 4;
-    params.tm0.mag_filter = 1;
+    GLuint sampler;
+    glGenSamplers(1, &sampler);
+    SetParameters(sampler, state);
+    it = m_cache.emplace(state, sampler).first;
   }
 
-  // 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);
-  }
+  m_active_samplers[stage].first = state;
+  m_active_samplers[stage].second = it->second;
+  glBindSampler(stage, it->second);
 }
 
-SamplerCache::Value& SamplerCache::GetEntry(const Params& params)
+void SamplerCache::InvalidateBinding(u32 stage)
 {
-  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;
+  m_active_samplers[stage].second = 0;
 }
 
-void SamplerCache::SetParameters(GLuint sampler_id, const Params& params)
+void SamplerCache::SetParameters(GLuint sampler_id, const SamplerState& 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,
-  };
+  GLenum min_filter;
+  GLenum mag_filter = (params.mag_filter == SamplerState::Filter::Point) ? GL_NEAREST : GL_LINEAR;
+  if (params.mipmap_filter == SamplerState::Filter::Linear)
+  {
+    min_filter = (params.min_filter == SamplerState::Filter::Point) ? GL_NEAREST_MIPMAP_LINEAR :
+                                                                      GL_LINEAR_MIPMAP_LINEAR;
+  }
+  else
+  {
+    min_filter = (params.min_filter == SamplerState::Filter::Point) ? GL_NEAREST_MIPMAP_NEAREST :
+                                                                      GL_LINEAR_MIPMAP_NEAREST;
+  }
 
-  static const GLint wrap_settings[4] = {
-      GL_CLAMP_TO_EDGE, GL_REPEAT, GL_MIRRORED_REPEAT, GL_REPEAT,
-  };
+  glSamplerParameteri(sampler_id, GL_TEXTURE_MIN_FILTER, min_filter);
+  glSamplerParameteri(sampler_id, GL_TEXTURE_MAG_FILTER, mag_filter);
 
-  auto& tm0 = params.tm0;
-  auto& tm1 = params.tm1;
+  static constexpr std::array<GLenum, 3> address_modes = {
+      {GL_CLAMP_TO_EDGE, GL_REPEAT, GL_MIRRORED_REPEAT}};
 
-  glSamplerParameteri(sampler_id, GL_TEXTURE_WRAP_S, wrap_settings[tm0.wrap_s]);
-  glSamplerParameteri(sampler_id, GL_TEXTURE_WRAP_T, wrap_settings[tm0.wrap_t]);
+  glSamplerParameteri(sampler_id, GL_TEXTURE_WRAP_S,
+                      address_modes[static_cast<u32>(params.wrap_u.Value())]);
+  glSamplerParameteri(sampler_id, GL_TEXTURE_WRAP_T,
+                      address_modes[static_cast<u32>(params.wrap_v.Value())]);
 
-  glSamplerParameterf(sampler_id, GL_TEXTURE_MIN_LOD, tm1.min_lod / 16.f);
-  glSamplerParameterf(sampler_id, GL_TEXTURE_MAX_LOD, tm1.max_lod / 16.f);
+  glSamplerParameterf(sampler_id, GL_TEXTURE_MIN_LOD, params.min_lod / 16.f);
+  glSamplerParameterf(sampler_id, GL_TEXTURE_MAX_LOD, params.max_lod / 16.f);
 
   if (GLInterface->GetMode() == GLInterfaceMode::MODE_OPENGL)
-    glSamplerParameterf(sampler_id, GL_TEXTURE_LOD_BIAS, (s32)tm0.lod_bias / 32.f);
+    glSamplerParameterf(sampler_id, GL_TEXTURE_LOD_BIAS, params.lod_bias / 32.f);
 
-  GLint min_filter = min_filters[tm0.min_filter];
-  GLint mag_filter = tm0.mag_filter ? GL_LINEAR : GL_NEAREST;
-
-  if (g_ActiveConfig.iMaxAnisotropy > 0 && g_ogl_config.bSupportsAniso &&
-      !SamplerCommon::IsBpTexMode0PointFiltering(tm0))
+  if (params.anisotropic_filtering && g_ogl_config.bSupportsAniso)
   {
-    // https://www.opengl.org/registry/specs/EXT/texture_filter_anisotropic.txt
-    // For predictable results on all hardware/drivers, only use one of:
-    //	GL_LINEAR + GL_LINEAR (No Mipmaps [Bilinear])
-    //	GL_LINEAR + GL_LINEAR_MIPMAP_LINEAR (w/ Mipmaps [Trilinear])
-    // Letting the game set other combinations will have varying arbitrary results;
-    // possibly being interpreted as equal to bilinear/trilinear, implicitly
-    // disabling anisotropy, or changing the anisotropic algorithm employed.
-    min_filter =
-        SamplerCommon::AreBpTexMode0MipmapsEnabled(tm0) ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR;
-    mag_filter = GL_LINEAR;
     glSamplerParameterf(sampler_id, GL_TEXTURE_MAX_ANISOTROPY_EXT,
-                        (float)(1 << g_ActiveConfig.iMaxAnisotropy));
+                        static_cast<float>(1 << g_ActiveConfig.iMaxAnisotropy));
   }
-
-  glSamplerParameteri(sampler_id, GL_TEXTURE_MIN_FILTER, min_filter);
-  glSamplerParameteri(sampler_id, GL_TEXTURE_MAG_FILTER, mag_filter);
 }
 
 void SamplerCache::Clear()
 {
   for (auto& p : m_cache)
-  {
-    glDeleteSamplers(1, &p.second.sampler_id);
-  }
+    glDeleteSamplers(1, &p.second);
+  for (auto& p : m_active_samplers)
+    p.second = 0;
   m_cache.clear();
 }
 }