OGL: Use GL_OES_texture_storage_multisample_2d_array when supported

See https://bugs.dolphin-emu.org/issues/13198

Source/Core/VideoBackends/OGL/OGLConfig.cpp

@@ -333,6 +333,7 @@ bool PopulateConfig(GLContext* m_main_gl_context)
   g_ogl_config.bSupportsDebug =
       GLExtensions::Supports("GL_KHR_debug") || GLExtensions::Supports("GL_ARB_debug_output");
   g_ogl_config.bSupportsTextureStorage = GLExtensions::Supports("GL_ARB_texture_storage");
+  g_ogl_config.SupportedMultisampleTexStorage = MultisampleTexStorageType::TexStorageNone;
   g_ogl_config.bSupportsImageLoadStore = GLExtensions::Supports("GL_ARB_shader_image_load_store");
   g_ogl_config.bSupportsConservativeDepth = GLExtensions::Supports("GL_ARB_conservative_depth");
   g_ogl_config.bSupportsAniso = GLExtensions::Supports("GL_EXT_texture_filter_anisotropic");
@@ -412,6 +413,8 @@ bool PopulateConfig(GLContext* m_main_gl_context)
       g_Config.backend_info.bSupportsFragmentStoresAndAtomics = true;
       g_ogl_config.bSupportsMSAA = true;
       g_ogl_config.bSupportsTextureStorage = true;
+      if (GLExtensions::Supports("GL_OES_texture_storage_multisample_2d_array"))
+        g_ogl_config.SupportedMultisampleTexStorage = MultisampleTexStorageType::TexStorageOes;
       g_Config.backend_info.bSupportsBitfield = true;
       g_Config.backend_info.bSupportsDynamicSamplerIndexing = g_ogl_config.bSupportsAEP;
     }
@@ -433,6 +436,7 @@ bool PopulateConfig(GLContext* m_main_gl_context)
       g_ogl_config.bSupportsDebug = true;
       g_ogl_config.bSupportsMSAA = true;
       g_ogl_config.bSupportsTextureStorage = true;
+      g_ogl_config.SupportedMultisampleTexStorage = MultisampleTexStorageType::TexStorageCore;
       g_Config.backend_info.bSupportsBitfield = true;
       g_Config.backend_info.bSupportsDynamicSamplerIndexing = true;
       g_Config.backend_info.bSupportsSettingObjectNames = true;
@@ -440,6 +444,9 @@ bool PopulateConfig(GLContext* m_main_gl_context)
   }
   else
   {
+    if (GLExtensions::Supports("GL_ARB_texture_storage_multisample"))
+      g_ogl_config.SupportedMultisampleTexStorage = MultisampleTexStorageType::TexStorageCore;
+
     if (GLExtensions::Version() < 300)
     {
       PanicAlertFmtT("GPU: OGL ERROR: Need at least GLSL 1.30\n"
@@ -486,6 +493,7 @@ bool PopulateConfig(GLContext* m_main_gl_context)
         g_ogl_config.eSupportedGLSLVersion = Glsl430;
       }
       g_ogl_config.bSupportsTextureStorage = true;
+      g_ogl_config.SupportedMultisampleTexStorage = MultisampleTexStorageType::TexStorageCore;
       g_ogl_config.bSupportsImageLoadStore = true;
       g_Config.backend_info.bSupportsSSAA = true;
       g_Config.backend_info.bSupportsSettingObjectNames = true;

Source/Core/VideoBackends/OGL/OGLConfig.h

@@ -45,6 +45,13 @@ enum class EsFbFetchType
   FbFetchArm,
 };
 
+enum class MultisampleTexStorageType
+{
+  TexStorageNone,
+  TexStorageCore,
+  TexStorageOes,
+};
+
 // ogl-only config, so not in VideoConfig.h
 struct VideoConfig
 {
@@ -62,6 +69,7 @@ struct VideoConfig
   EsPointSizeType SupportedESPointSize;
   EsTexbufType SupportedESTextureBuffer;
   bool bSupportsTextureStorage;
+  MultisampleTexStorageType SupportedMultisampleTexStorage;
   bool bSupportsConservativeDepth;
   bool bSupportsImageLoadStore;
   bool bSupportsAniso;

Source/Core/VideoBackends/OGL/OGLTexture.cpp

@@ -130,13 +130,19 @@ OGLTexture::OGLTexture(const TextureConfig& tex_config, std::string_view name)
   GLenum gl_internal_format = GetGLInternalFormatForTextureFormat(m_config.format, true);
   if (tex_config.IsMultisampled())
   {
-    if (g_ogl_config.bSupportsTextureStorage)
+    ASSERT(g_ogl_config.bSupportsMSAA);
+    if (g_ogl_config.SupportedMultisampleTexStorage != MultisampleTexStorageType::TexStorageNone)
+    {
       glTexStorage3DMultisample(target, tex_config.samples, gl_internal_format, m_config.width,
                                 m_config.height, m_config.layers, GL_FALSE);
+    }
     else
+    {
+      ASSERT(!g_ogl_config.bIsES);
       glTexImage3DMultisample(target, tex_config.samples, gl_internal_format, m_config.width,
                               m_config.height, m_config.layers, GL_FALSE);
     }
+  }
   else if (g_ogl_config.bSupportsTextureStorage)
   {
     glTexStorage3D(target, m_config.levels, gl_internal_format, m_config.width, m_config.height,

Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp

@@ -722,8 +722,12 @@ void ProgramShaderCache::CreateHeader()
     break;
   }
 
-  // The sampler2DMSArray keyword is reserved in GLSL ES 3.0 and 3.1, but is available in 3.2.
+  // The sampler2DMSArray keyword is reserved in GLSL ES 3.0 and 3.1, but is available in 3.2 and
-  const bool use_multisample_2d_array_precision = v >= GlslEs320;
+  // with GL_OES_texture_storage_multisample_2d_array for 3.1.
+  // See https://bugs.dolphin-emu.org/issues/13198.
+  const bool use_multisample_2d_array_precision =
+      v >= GlslEs320 ||
+      g_ogl_config.SupportedMultisampleTexStorage != MultisampleTexStorageType::TexStorageNone;
 
   std::string shader_shuffle_string;
   if (g_ogl_config.bSupportsKHRShaderSubgroup)
@@ -762,6 +766,7 @@ void ProgramShaderCache::CreateHeader()
       "{}\n"  // shader thread shuffle
       "{}\n"  // derivative control
       "{}\n"  // query levels
+      "{}\n"  // OES multisample texture storage
 
       // Precision defines for GLSL ES
       "{}\n"
@@ -847,6 +852,12 @@ void ProgramShaderCache::CreateHeader()
       g_ActiveConfig.backend_info.bSupportsTextureQueryLevels ?
           "#extension GL_ARB_texture_query_levels : enable" :
           "",
+      // Note: GL_ARB_texture_storage_multisample doesn't have an #extension, as it doesn't
+      // need to change GLSL, but on GLES 3.1 sampler2DMSArray is a reserved keyword unless
+      // the extension is enabled. Thus, we don't need to check TexStorageCore/have an ARB version.
+      g_ogl_config.SupportedMultisampleTexStorage == MultisampleTexStorageType::TexStorageOes ?
+          "#extension GL_OES_texture_storage_multisample_2d_array : enable" :
+          "",
       is_glsles ? "precision highp float;" : "", is_glsles ? "precision highp int;" : "",
       is_glsles ? "precision highp sampler2DArray;" : "",
       (is_glsles && g_ActiveConfig.backend_info.bSupportsPaletteConversion) ?