From c630d365cdfd03147c2a158b28ffaedf0067a2d3 Mon Sep 17 00:00:00 2001
From: "Unknown W. Brackets" <checkins@unknownbrackets.org>
Date: Thu, 28 Jan 2021 01:03:02 -0800
Subject: [PATCH] Vulkan: Allow tex shaders to specify a max scale.

---
 GPU/Common/PostShader.cpp         | 1 +
 GPU/Common/PostShader.h           | 1 +
 GPU/Vulkan/TextureCacheVulkan.cpp | 4 ++++
 GPU/Vulkan/TextureCacheVulkan.h   | 1 +
 4 files changed, 7 insertions(+)

diff --git a/GPU/Common/PostShader.cpp b/GPU/Common/PostShader.cpp
index 9971650ba5..e415aa9226 100644
--- a/GPU/Common/PostShader.cpp
+++ b/GPU/Common/PostShader.cpp
@@ -161,6 +161,7 @@ void LoadPostShaderInfo(const std::vector<std::string> &directories) {
 					info.section = section.name();
 					section.Get("Name", &info.name, section.name().c_str());
 					section.Get("Compute", &temp, "");
+					section.Get("MaxScale", &info.maxScale, 255);
 					info.computeShaderFile = path + "/" + temp;
 
 					appendTextureShader(info);
diff --git a/GPU/Common/PostShader.h b/GPU/Common/PostShader.h
index 42aa30d4bc..b5c1f562f9 100644
--- a/GPU/Common/PostShader.h
+++ b/GPU/Common/PostShader.h
@@ -70,6 +70,7 @@ struct TextureShaderInfo {
 	std::string name;
 
 	std::string computeShaderFile;
+	int maxScale;
 
 	bool operator == (const std::string &other) {
 		return name == other;
diff --git a/GPU/Vulkan/TextureCacheVulkan.cpp b/GPU/Vulkan/TextureCacheVulkan.cpp
index 8563a88310..e568869b10 100644
--- a/GPU/Vulkan/TextureCacheVulkan.cpp
+++ b/GPU/Vulkan/TextureCacheVulkan.cpp
@@ -394,6 +394,7 @@ void TextureCacheVulkan::CompileScalingShader() {
 		if (copyCS_ != VK_NULL_HANDLE)
 			vulkan_->Delete().QueueDeleteShaderModule(copyCS_);
 		textureShader_.clear();
+		maxScaleFactor_ = 255;
 	} else if (uploadCS_ || copyCS_) {
 		// No need to recreate.
 		return;
@@ -417,6 +418,7 @@ void TextureCacheVulkan::CompileScalingShader() {
 	_dbg_assert_msg_(copyCS_ != VK_NULL_HANDLE, "failed to compile copy shader");
 
 	textureShader_ = g_Config.sTextureShaderName;
+	maxScaleFactor_ = shaderInfo->maxScale;
 }
 
 void TextureCacheVulkan::ReleaseTexture(TexCacheEntry *entry, bool delete_them) {
@@ -762,6 +764,8 @@ void TextureCacheVulkan::BuildTexture(TexCacheEntry *const entry) {
 	VkFormat dstFmt = GetDestFormat(GETextureFormat(entry->format), gstate.getClutPaletteFormat());
 
 	int scaleFactor = standardScaleFactor_;
+	if (scaleFactor > maxScaleFactor_)
+		scaleFactor = maxScaleFactor_;
 
 	// Rachet down scale factor in low-memory mode.
 	if (lowMemoryMode_) {
diff --git a/GPU/Vulkan/TextureCacheVulkan.h b/GPU/Vulkan/TextureCacheVulkan.h
index 254efcd40b..7f8ae32d25 100644
--- a/GPU/Vulkan/TextureCacheVulkan.h
+++ b/GPU/Vulkan/TextureCacheVulkan.h
@@ -139,6 +139,7 @@ private:
 	Vulkan2D *vulkan2D_;
 
 	std::string textureShader_;
+	int maxScaleFactor_ = 255;
 	VkShaderModule uploadCS_ = VK_NULL_HANDLE;
 	VkShaderModule copyCS_ = VK_NULL_HANDLE;