From d2904c1fd5625e127ae7e8c79c3361bf62f18c13 Mon Sep 17 00:00:00 2001
From: lightningterror <18107717+lightningterror@users.noreply.github.com>
Date: Fri, 10 Jun 2022 15:23:58 +0200
Subject: [PATCH] GS: Fix up wave filter shaders.

---
 bin/resources/shaders/dx11/present.fx     | 10 ++++------
 bin/resources/shaders/opengl/present.glsl | 12 ++----------
 bin/resources/shaders/vulkan/present.glsl |  6 ++----
 pcsx2/GS/Renderers/Metal/present.metal    | 15 ++++-----------
 4 files changed, 12 insertions(+), 31 deletions(-)

diff --git a/bin/resources/shaders/dx11/present.fx b/bin/resources/shaders/dx11/present.fx
index 648bb59ab6..2456fff3a2 100644
--- a/bin/resources/shaders/dx11/present.fx
+++ b/bin/resources/shaders/dx11/present.fx
@@ -135,12 +135,10 @@ PS_OUTPUT ps_filter_complex(PS_INPUT input) // triangular
 {
 	PS_OUTPUT output;
 
-	float2 texdim, halfpixel; 
-	Texture.GetDimensions(texdim.x, texdim.y); 
-	if (ddy(input.t.y) * input.t.y > 0.5) 
-		output.c = sample_c(input.t); 
-	else
-		output.c = (0.9 - 0.4 * cos(2 * PI * input.t.y * texdim.y)) * sample_c(float2(input.t.x, (floor(input.t.y * texdim.y) + 0.5) / texdim.y));
+	float2 texdim; 
+	Texture.GetDimensions(texdim.x, texdim.y);
+
+	output.c = (0.9 - 0.4 * cos(2 * PI * input.t.y * texdim.y)) * sample_c(float2(input.t.x, (floor(input.t.y * texdim.y) + 0.5) / texdim.y));
 
 	return output;
 }
diff --git a/bin/resources/shaders/opengl/present.glsl b/bin/resources/shaders/opengl/present.glsl
index 37076f8bfc..911dd01f4a 100644
--- a/bin/resources/shaders/opengl/present.glsl
+++ b/bin/resources/shaders/opengl/present.glsl
@@ -119,18 +119,10 @@ void ps_filter_triangular() // triangular
 #ifdef ps_filter_complex
 void ps_filter_complex()
 {
-
     const float PI = 3.14159265359f;
-
     vec2 texdim = vec2(textureSize(TextureSampler, 0));
-
-    vec4 c;
-    if (dFdy(PSin_t.y) * PSin_t.y > 0.5f) {
-        c = sample_c();
-    } else {
-        float factor = (0.9f - 0.4f * cos(2.0f * PI * PSin_t.y * texdim.y));
-        c =  factor * texture(TextureSampler, vec2(PSin_t.x, (floor(PSin_t.y * texdim.y) + 0.5f) / texdim.y));
-    }
+    float factor = (0.9f - 0.4f * cos(2.0f * PI * PSin_t.y * texdim.y));
+    vec4 c =  factor * texture(TextureSampler, vec2(PSin_t.x, (floor(PSin_t.y * texdim.y) + 0.5f) / texdim.y));
 
     SV_Target0 = c;
 }
diff --git a/bin/resources/shaders/vulkan/present.glsl b/bin/resources/shaders/vulkan/present.glsl
index 8523e3014f..68c1d438e5 100644
--- a/bin/resources/shaders/vulkan/present.glsl
+++ b/bin/resources/shaders/vulkan/present.glsl
@@ -106,10 +106,8 @@ void ps_filter_complex() // triangular
 {
 	const float PI = 3.14159265359f;
 	vec2 texdim = vec2(textureSize(samp0, 0));
-	if (dFdy(v_tex.y) * v_tex.y > 0.5) 
-		o_col0 = sample_c(v_tex); 
-	else
-		o_col0 = (0.9 - 0.4 * cos(2 * PI * v_tex.y * texdim.y)) * sample_c(vec2(v_tex.x, (floor(v_tex.y * texdim.y) + 0.5) / texdim.y));
+	
+	o_col0 = (0.9 - 0.4 * cos(2 * PI * v_tex.y * texdim.y)) * sample_c(vec2(v_tex.x, (floor(v_tex.y * texdim.y) + 0.5) / texdim.y));
 }
 #endif
 
diff --git a/pcsx2/GS/Renderers/Metal/present.metal b/pcsx2/GS/Renderers/Metal/present.metal
index ff5a600b6e..179b38f7f8 100644
--- a/pcsx2/GS/Renderers/Metal/present.metal
+++ b/pcsx2/GS/Renderers/Metal/present.metal
@@ -66,15 +66,8 @@ fragment float4 ps_filter_triangular(ConvertShaderData data [[stage_in]], Conver
 fragment float4 ps_filter_complex(ConvertShaderData data [[stage_in]], ConvertPSRes res)
 {
 	float2 texdim = float2(res.texture.get_width(), res.texture.get_height());
-
-	if (dfdy(data.t.y) * texdim.y > 0.5)
-	{
-		return res.sample(data.t);
-	}
-	else
-	{
-		float factor = (0.9f - 0.4f * cos(2.f * M_PI_F * data.t.y * texdim.y));
-		float ycoord = (floor(data.t.y * texdim.y) + 0.5f) / texdim.y;
-		return factor * res.sample(float2(data.t.x, ycoord));
-	}
+	float factor = (0.9f - 0.4f * cos(2.f * M_PI_F * data.t.y * texdim.y));
+	float ycoord = (floor(data.t.y * texdim.y) + 0.5f) / texdim.y;
+	
+	return factor * res.sample(float2(data.t.x, ycoord));
 }