GS/HW: Allow use of trilinear with shader sampling

bin/resources/shaders/dx11/tfx.fx

@@ -162,6 +162,7 @@ cbuffer cb1
 	uint4 FbMask;
 	float4 HalfTexel;
 	float4 MinMax;
+	float4 LODParams;
 	float4 STRange;
 	int4 ChannelShuffle;
 	float2 TC_OffsetHack;
@@ -207,10 +208,10 @@ float4 sample_c(float2 uv, float uv_w)
 	return Texture.Sample(TextureSampler, uv);
 #elif PS_MANUAL_LOD == 1
 	// FIXME add LOD: K - ( LOG2(Q) * (1 << L))
-	float K = MinMax.x;
-	float L = MinMax.y;
-	float bias = MinMax.z;
-	float max_lod = MinMax.w;
+	float K = LODParams.x;
+	float L = LODParams.y;
+	float bias = LODParams.z;
+	float max_lod = LODParams.w;
 
 	float gs_lod = K - log2(abs(uv_w)) * L;
 	// FIXME max useful ?

bin/resources/shaders/opengl/tfx_fs.glsl

@@ -44,6 +44,7 @@ layout(std140, binding = 0) uniform cb21
 	vec4 HalfTexel;
 
 	vec4 MinMax;
+	vec4 LODParams;
 	vec4 STRange;
 
 	ivec4 ChannelShuffle;
@@ -159,10 +160,10 @@ vec4 sample_c(vec2 uv)
 	return texture(TextureSampler, uv);
 #elif PS_MANUAL_LOD == 1
 	// FIXME add LOD: K - ( LOG2(Q) * (1 << L))
-	float K = MinMax.x;
-	float L = MinMax.y;
-	float bias = MinMax.z;
-	float max_lod = MinMax.w;
+	float K = LODParams.x;
+	float L = LODParams.y;
+	float bias = LODParams.z;
+	float max_lod = LODParams.w;
 
 	float gs_lod = K - log2(abs(PSin.t_float.w)) * L;
 	// FIXME max useful ?

bin/resources/shaders/vulkan/tfx.glsl

@@ -316,6 +316,7 @@ layout(std140, set = 0, binding = 1) uniform cb1
 	uvec4 FbMask;
 	vec4 HalfTexel;
 	vec4 MinMax;
+	vec4 LODParams;
 	vec4 STRange;
 	ivec4 ChannelShuffle;
 	vec2 TC_OffsetHack;
@@ -399,10 +400,10 @@ vec4 sample_c(vec2 uv)
 	return texture(Texture, uv);
 #elif PS_MANUAL_LOD == 1
 	// FIXME add LOD: K - ( LOG2(Q) * (1 << L))
-	float K = MinMax.x;
-	float L = MinMax.y;
-	float bias = MinMax.z;
-	float max_lod = MinMax.w;
+	float K = LODParams.x;
+	float L = LODParams.y;
+	float bias = LODParams.z;
+	float max_lod = LODParams.w;
 
 	float gs_lod = K - log2(abs(vsIn.t.w)) * L;
 	// FIXME max useful ?

pcsx2/GS/Renderers/Common/GSDevice.h

@@ -585,6 +585,7 @@ struct alignas(16) GSHWDrawConfig
 
 		GSVector4 HalfTexel;
 		GSVector4 MinMax;
+		GSVector4 LODParams;
 		GSVector4 STRange;
 		GSVector4i ChannelShuffle;
 		GSVector2 TCOffsetHack;

pcsx2/GS/Renderers/HW/GSRendererHW.cpp

@@ -4739,7 +4739,6 @@ void GSRendererHW::EmulateBlending(int rt_alpha_min, int rt_alpha_max, bool& DAT
 __ri static constexpr bool IsRedundantClamp(u8 clamp, u32 clamp_min, u32 clamp_max, u32 tsize)
 {
 	// Don't shader sample when the clamp/repeat is configured to the texture size.
-	// That way trilinear etc still works.
 	const u32 textent = (1u << tsize) - 1u;
 	if (clamp == CLAMP_REGION_CLAMP)
 		return (clamp_min == 0 && clamp_max >= textent);
@@ -4805,6 +4804,7 @@ __ri void GSRendererHW::EmulateTextureSampler(const GSTextureCache::Target* rt,
 	const bool need_mipmap = IsMipMapDraw();
 	const bool shader_emulated_sampler = tex->m_palette || (tex->m_target && !m_conf.ps.shuffle && cpsm.fmt != 0) ||
 										 complex_wms_wmt || psm.depth || target_region;
+	const bool can_trilinear = !tex->m_palette && !tex->m_target && !m_conf.ps.shuffle;
 	const bool trilinear_manual = need_mipmap && GSConfig.HWMipmap;
 
 	bool bilinear = m_vt.IsLinear();
@@ -4817,16 +4817,19 @@ __ri void GSRendererHW::EmulateTextureSampler(const GSTextureCache::Target* rt,
 			// Force bilinear otherwise we can end up with min/mag nearest and mip linear.
 			// We don't need to check for HWMipmapLevel::Off here, because forced trilinear implies forced mipmaps.
 			bilinear = true;
-			trilinear = static_cast<u8>(GS_MIN_FILTER::Linear_Mipmap_Linear);
-			trilinear_auto = !tex->m_target && (!need_mipmap || !GSConfig.HWMipmap);
+			if (can_trilinear)
+			{
+				trilinear = static_cast<u8>(GS_MIN_FILTER::Linear_Mipmap_Linear);
+				trilinear_auto = !tex->m_target && (!need_mipmap || !GSConfig.HWMipmap);
+			}
 		}
 		break;
 
 		case TriFiltering::PS2:
 		case TriFiltering::Automatic:
 		{
 			// Can only use PS2 trilinear when mipmapping is enabled.
-			if (need_mipmap && GSConfig.HWMipmap)
+			if (need_mipmap && GSConfig.HWMipmap && can_trilinear)
 			{
 				trilinear = m_context->TEX1.MMIN;
 				trilinear_auto = !tex->m_target && !GSConfig.HWMipmap;
@@ -5033,17 +5036,19 @@ __ri void GSRendererHW::EmulateTextureSampler(const GSTextureCache::Target* rt,
 			m_conf.cb_ps.MinMax.w = (wmt == CLAMP_REGION_CLAMP && !m_conf.ps.depth_fmt) ? region_clamp.w : region_repeat.w;
 		}
 	}
-	else if (trilinear_manual)
+
+	if (trilinear_manual)
 	{
-		// Reuse uv_min_max for mipmap parameter to avoid an extension of the UBO
-		m_conf.cb_ps.MinMax.x = static_cast<float>(m_context->TEX1.K) / 16.0f;
-		m_conf.cb_ps.MinMax.y = static_cast<float>(1 << m_context->TEX1.L);
-		m_conf.cb_ps.MinMax.z = static_cast<float>(m_lod.x); // Offset because first layer is m_lod, dunno if we can do better
-		m_conf.cb_ps.MinMax.w = static_cast<float>(m_lod.y);
+		m_conf.cb_ps.LODParams.x = static_cast<float>(m_context->TEX1.K) / 16.0f;
+		m_conf.cb_ps.LODParams.y = static_cast<float>(1 << m_context->TEX1.L);
+		m_conf.cb_ps.LODParams.z = static_cast<float>(m_lod.x); // Offset because first layer is m_lod, dunno if we can do better
+		m_conf.cb_ps.LODParams.w = static_cast<float>(m_lod.y);
+		m_conf.ps.manual_lod = 1;
 	}
 	else if (trilinear_auto)
 	{
 		tex->m_texture->GenerateMipmapsIfNeeded();
+		m_conf.ps.automatic_lod = 1;
 	}
 
 	// TC Offset Hack
@@ -5059,7 +5064,11 @@ __ri void GSRendererHW::EmulateTextureSampler(const GSTextureCache::Target* rt,
 	{
 		m_conf.sampler.biln = 0;
 		m_conf.sampler.aniso = 0;
-		m_conf.sampler.triln = 0;
+
+		// Remove linear from trilinear, since we're doing the bilinear in the shader, and we only want this for mip selection.
+		m_conf.sampler.triln = (trilinear >= static_cast<u8>(GS_MIN_FILTER::Linear_Mipmap_Nearest)) ?
+								   (trilinear - static_cast<u8>(GS_MIN_FILTER::Nearest_Mipmap_Nearest)) :
+								   0;
 	}
 	else
 	{
@@ -5069,14 +5078,8 @@ __ri void GSRendererHW::EmulateTextureSampler(const GSTextureCache::Target* rt,
 		const bool anisotropic = m_vt.m_primclass == GS_TRIANGLE_CLASS && !trilinear_manual;
 		m_conf.sampler.aniso = anisotropic;
 		m_conf.sampler.triln = trilinear;
-		if (trilinear_manual)
-		{
-			m_conf.ps.manual_lod = 1;
-		}
-		else if (trilinear_auto || anisotropic)
-		{
+		if (anisotropic && !trilinear_manual)
 			m_conf.ps.automatic_lod = 1;
-		}
 	}
 
 	// clamp to base level if we're not providing or generating mipmaps

pcsx2/GS/Renderers/Metal/GSMTLSharedHeader.h

@@ -111,6 +111,7 @@ struct GSMTLMainPSUniform
 		vector_float4 uv_min_max;
 		vector_uint4 uv_msk_fix;
 	};
+	vector_float4 lod_params;
 	vector_float4 st_range;
 	struct
 	{

pcsx2/GS/Renderers/Metal/tfx.metal

@@ -356,10 +356,10 @@ struct PSMain
 		}
 		else if (PS_MANUAL_LOD)
 		{
-			float K = cb.uv_min_max.x;
-			float L = cb.uv_min_max.y;
-			float bias = cb.uv_min_max.z;
-			float max_lod = cb.uv_min_max.w;
+			float K = cb.lod_params.x;
+			float L = cb.lod_params.y;
+			float bias = cb.lod_params.z;
+			float max_lod = cb.lod_params.w;
 
 			float gs_lod = K - log2(abs(in.t.w)) * L;
 			// FIXME max useful ?

pcsx2/ShaderCacheVersion.h

@@ -3,4 +3,4 @@
 
 /// Version number for GS and other shaders. Increment whenever any of the contents of the
 /// shaders change, to invalidate the cache.
-static constexpr u32 SHADER_CACHE_VERSION = 50;
+static constexpr u32 SHADER_CACHE_VERSION = 51;