Switch texture scaling shaders to a fixed scale model, preparing for the next change.

GPU/Common/PostShader.cpp

@@ -208,14 +208,15 @@ void LoadPostShaderInfo(Draw::DrawContext *draw, const std::vector<Path> &direct
 					info.section = section.name();
 					section.Get("Name", &info.name, section.name().c_str());
 					section.Get("Compute", &temp, "");
-					section.Get("MaxScale", &info.maxScale, 255);
+					section.Get("Scale", &info.scaleFactor, 0);
 					info.computeShaderFile = path / temp;
-
+					if (info.scaleFactor >= 2 && info.scaleFactor < 8) {
 						appendTextureShader(info);
 					}
 				}
 			}
 		}
+	}
 
 	// We always want the not visible ones at the end.  Makes menus easier.
 	for (const auto &info : notVisible) {

GPU/Common/PostShader.h

@@ -72,7 +72,9 @@ struct TextureShaderInfo {
 	std::string name;
 
 	Path computeShaderFile;
-	int maxScale;
+
+	// Upscaling shaders have a fixed scale factor.
+	int scaleFactor;
 
 	bool operator == (const std::string &other) {
 		return name == other;

GPU/Vulkan/TextureCacheVulkan.cpp

@@ -299,7 +299,7 @@ void TextureCacheVulkan::CompileScalingShader() {
 		if (uploadCS_ != VK_NULL_HANDLE)
 			vulkan_->Delete().QueueDeleteShaderModule(uploadCS_);
 		textureShader_.clear();
-		maxScaleFactor_ = 255;
+		shaderScaleFactor_ = 0;  // no texture scaling shader
 	} else if (uploadCS_) {
 		// No need to recreate.
 		return;
@@ -321,7 +321,7 @@ void TextureCacheVulkan::CompileScalingShader() {
 	_dbg_assert_msg_(uploadCS_ != VK_NULL_HANDLE, "failed to compile upload shader");
 
 	textureShader_ = g_Config.sTextureShaderName;
-	maxScaleFactor_ = shaderInfo->maxScale;
+	shaderScaleFactor_ = shaderInfo->scaleFactor;
 }
 
 void TextureCacheVulkan::ReleaseTexture(TexCacheEntry *entry, bool delete_them) {
@@ -677,11 +677,15 @@ void TextureCacheVulkan::BuildTexture(TexCacheEntry *const entry) {
 	}
 
 	int scaleFactor = standardScaleFactor_;
-	if (scaleFactor > maxScaleFactor_)
+	bool hardwareScaling = g_Config.bTexHardwareScaling && uploadCS_ != VK_NULL_HANDLE;
-		scaleFactor = maxScaleFactor_;
+	if (hardwareScaling) {
+		_assert_(shaderScaleFactor_ != 0);
+		scaleFactor = shaderScaleFactor_;
+	}
 
 	// Rachet down scale factor in low-memory mode.
-	if (lowMemoryMode_) {
+	// TODO: I think really we should just turn it off?
+	if (lowMemoryMode_ && !hardwareScaling) {
 		// Keep it even, though, just in case of npot troubles.
 		scaleFactor = scaleFactor > 4 ? 4 : (scaleFactor > 2 ? 2 : 1);
 	}
@@ -696,11 +700,10 @@ void TextureCacheVulkan::BuildTexture(TexCacheEntry *const entry) {
 		badMipSizes = false;
 	}
 
-	bool hardwareScaling = g_Config.bTexHardwareScaling && uploadCS_ != VK_NULL_HANDLE;
-
 	// Don't scale the PPGe texture.
-	if (entry->addr > 0x05000000 && entry->addr < PSP_GetKernelMemoryEnd())
+	if (entry->addr > 0x05000000 && entry->addr < PSP_GetKernelMemoryEnd()) {
 		scaleFactor = 1;
+	}
 	if ((entry->status & TexCacheEntry::STATUS_CHANGE_FREQUENT) != 0 && scaleFactor != 1 && !hardwareScaling) {
 		// Remember for later that we /wanted/ to scale this texture.
 		entry->status |= TexCacheEntry::STATUS_TO_SCALE;

GPU/Vulkan/TextureCacheVulkan.h

@@ -135,7 +135,7 @@ private:
 	Vulkan2D *vulkan2D_;
 
 	std::string textureShader_;
-	int maxScaleFactor_ = 255;
+	int shaderScaleFactor_ = 0;
 	VkShaderModule uploadCS_ = VK_NULL_HANDLE;
 
 	// Bound state to emulate an API similar to the others

UI/GameSettingsScreen.cpp

@@ -533,6 +533,11 @@ void GameSettingsScreen::CreateViews() {
 	static const char *texScaleLevels[] = {"Off", "2x", "3x"};
 #endif
 
+	static const char *texScaleAlgos[] = { "xBRZ", "Hybrid", "Bicubic", "Hybrid + Bicubic", };
+	PopupMultiChoice *texScalingType = graphicsSettings->Add(new PopupMultiChoice(&g_Config.iTexScalingType, gr->T("Upscale Type"), texScaleAlgos, 0, ARRAY_SIZE(texScaleAlgos), gr->GetName(), screenManager()));
+	texScalingType->SetEnabledFunc([]() {
+		return !g_Config.bSoftwareRendering && !UsingHardwareTextureScaling();
+	});
 	PopupMultiChoice *texScalingChoice = graphicsSettings->Add(new PopupMultiChoice(&g_Config.iTexScalingLevel, gr->T("Upscale Level"), texScaleLevels, 1, ARRAY_SIZE(texScaleLevels), gr->GetName(), screenManager()));
 	// TODO: Better check?  When it won't work, it scales down anyway.
 	if (!gl_extensions.OES_texture_npot && GetGPUBackend() == GPUBackend::OPENGL) {
@@ -545,11 +550,7 @@ void GameSettingsScreen::CreateViews() {
 		}
 		return UI::EVENT_CONTINUE;
 	});
-	texScalingChoice->SetDisabledPtr(&g_Config.bSoftwareRendering);
+	texScalingChoice->SetEnabledFunc([]() {
-
-	static const char *texScaleAlgos[] = { "xBRZ", "Hybrid", "Bicubic", "Hybrid + Bicubic", };
-	PopupMultiChoice *texScalingType = graphicsSettings->Add(new PopupMultiChoice(&g_Config.iTexScalingType, gr->T("Upscale Type"), texScaleAlgos, 0, ARRAY_SIZE(texScaleAlgos), gr->GetName(), screenManager()));
-	texScalingType->SetEnabledFunc([]() {
 		return !g_Config.bSoftwareRendering && !UsingHardwareTextureScaling();
 	});
 

assets/shaders/defaultshaders.ini

@@ -151,13 +151,14 @@ Fragment=psp_color.fsh
 Vertex=fxaa.vsh
 [Tex4xBRZ]
 Type=Texture
-Name=4xBRZ
+Name=4xBRZ (4x)
 Author=Hyllian
 Compute=tex_4xbrz.csh
 VendorBlacklist=ARM
+Scale=4
 [TexMMPX]
 Type=Texture
-Name=MMPX
+Name=MMPX (2x)
 Author=Morgan McGuire and Mara Gagiu
 Compute=tex_mmpx.csh
-MaxScale=2
+Scale=2