TextureCache: Fix D3D backends crashing when a game uses multiple 1x1-sized LODs.

Source/Core/VideoCommon/Src/TextureCacheBase.cpp

@@ -318,7 +318,7 @@ static TextureCache::TCacheEntryBase* ReturnEntry(unsigned int stage, TextureCac
 
 TextureCache::TCacheEntryBase* TextureCache::Load(unsigned int const stage,
 	u32 const address, unsigned int width, unsigned int height, int const texformat,
-	unsigned int const tlutaddr, int const tlutfmt, bool const use_mipmaps, unsigned int const maxlevel, bool const from_tmem)
+	unsigned int const tlutaddr, int const tlutfmt, bool const use_mipmaps, unsigned int maxlevel, bool const from_tmem)
 {
 	if (0 == address)
 		return NULL;
@@ -372,6 +372,11 @@ TextureCache::TCacheEntryBase* TextureCache::Load(unsigned int const stage,
 		tex_hash ^= tlut_hash;
 	}
 
+	// D3D doesn't like when the specified mipmap count would require more than one 1x1-sized LOD in the mipmap chain
+	// e.g. 64x64 with 7 LODs would have the mipmap chain 64x64,32x32,16x16,8x8,4x4,2x2,1x1,1x1, so we limit the mipmap count to 6 there
+	while (g_ActiveConfig.backend_info.bUseMinimalMipCount && max(expandedWidth, expandedHeight) >> maxlevel == 0)
+		--maxlevel;
+
 	TCacheEntryBase *entry = textures[texID];
 	if (entry)
 	{
@@ -456,7 +461,7 @@ TextureCache::TCacheEntryBase* TextureCache::Load(unsigned int const stage,
 	const bool using_custom_lods = using_custom_texture && CheckForCustomTextureLODs(tex_hash, texformat, texLevels);
 	// Only load native mips if their dimensions fit to our virtual texture dimensions
 	const bool use_native_mips = use_mipmaps && !using_custom_lods && (width == nativeW && height == nativeH);
-	texLevels = (use_native_mips || using_custom_lods) ? texLevels : 1;
+	texLevels = (use_native_mips || using_custom_lods) ? texLevels : 1; // TODO: Should be forced to 1 for non-pow2 textures (e.g. efb copies with automatically adjusted IR)
 
 	// create the entry/texture
 	if (NULL == entry)

Source/Core/VideoCommon/Src/VideoConfig.cpp

@@ -42,6 +42,7 @@ VideoConfig::VideoConfig()
 	// disable all features by default
 	backend_info.APIType = API_NONE;
 	backend_info.bUseRGBATextures = false;
+	backend_info.bUseMinimalMipCount = false;
 	backend_info.bSupports3DVision = false;
 }
 

Source/Core/VideoCommon/Src/VideoConfig.h

@@ -157,6 +157,7 @@ struct VideoConfig
 		std::vector<std::string> PPShaders; // post-processing shaders
 
 		bool bUseRGBATextures; // used for D3D11 in TextureCache
+		bool bUseMinimalMipCount;
 		bool bSupports3DVision;
 		bool bSupportsDualSourceBlend; // only supported by D3D11 and OpenGL
 		bool bSupportsFormatReinterpretation;

Source/Plugins/Plugin_VideoDX11/Src/main.cpp

@@ -90,6 +90,7 @@ void InitBackendInfo()
 
 	g_Config.backend_info.APIType = API_D3D11;
 	g_Config.backend_info.bUseRGBATextures = true; // the GX formats barely match any D3D11 formats
+	g_Config.backend_info.bUseMinimalMipCount = true;
 	g_Config.backend_info.bSupports3DVision = false;
 	g_Config.backend_info.bSupportsDualSourceBlend = true;
 	g_Config.backend_info.bSupportsFormatReinterpretation = true;

Source/Plugins/Plugin_VideoDX9/Src/main.cpp

@@ -93,6 +93,7 @@ void InitBackendInfo()
 	const int maxConstants = (shaderModel < 3) ? 32 : ((shaderModel < 4) ? 224 : 65536);
 	g_Config.backend_info.APIType = shaderModel < 3 ? API_D3D9_SM20 :API_D3D9_SM30;
 	g_Config.backend_info.bUseRGBATextures = false;
+	g_Config.backend_info.bUseMinimalMipCount = true;
 	g_Config.backend_info.bSupports3DVision = true;
 	g_Config.backend_info.bSupportsDualSourceBlend = false;
 	g_Config.backend_info.bSupportsFormatReinterpretation = true;

Source/Plugins/Plugin_VideoOGL/Src/main.cpp

@@ -130,6 +130,7 @@ void InitBackendInfo()
 {
 	g_Config.backend_info.APIType = API_OPENGL;
 	g_Config.backend_info.bUseRGBATextures = false;
+	g_Config.backend_info.bUseMinimalMipCount = false;
 	g_Config.backend_info.bSupports3DVision = false;
 	g_Config.backend_info.bSupportsDualSourceBlend = false; // supported, but broken
 	g_Config.backend_info.bSupportsFormatReinterpretation = false;