GS/HW: Adjust RTA shader precision.

bin/resources/shaders/dx11/convert.fx

@@ -139,7 +139,7 @@ PS_OUTPUT ps_rta_correction(PS_INPUT input)
 {
 	PS_OUTPUT output;
 	float4 value = sample_c(input.t);
-	output.c = float4(value.rgb, (value.a * 255.0f) / 127.5f);
+	output.c = float4(value.rgb, (value.a * 255.0f + 0.1f) / 127.5f);
 	return output;
 }
 
@@ -147,7 +147,7 @@ PS_OUTPUT ps_rta_decorrection(PS_INPUT input)
 {
 	PS_OUTPUT output;
 	float4 value = sample_c(input.t);
-	output.c = float4(value.rgb, (value.a * 127.5f) / 255.0f);
+	output.c = float4(value.rgb, (value.a * 127.5f + 0.1f) / 255.0f);
 	return output;
 }
 

bin/resources/shaders/opengl/convert.glsl

@@ -337,7 +337,7 @@ void ps_datm0_rta_correction()
 void ps_rta_correction()
 {
 	vec4 value = sample_c();
-	SV_Target0 = vec4(value.rgb, (value.a * 255.0f) / 127.5f);
+	SV_Target0 = vec4(value.rgb, (value.a * 255.0f + 0.1f) / 127.5f);
 }
 #endif
 
@@ -345,7 +345,7 @@ void ps_rta_correction()
 void ps_rta_decorrection()
 {
 	vec4 value = sample_c();
-	SV_Target0 = vec4(value.rgb, (value.a * 127.5f) / 255.0f);
+	SV_Target0 = vec4(value.rgb, (value.a * 127.5f + 0.1f) / 255.0f);
 }
 #endif
 

bin/resources/shaders/vulkan/convert.glsl

@@ -114,7 +114,7 @@ void ps_datm0_rta_correction()
 void ps_rta_correction()
 {
 	vec4 value = sample_c(v_tex);
-	o_col0 = vec4(value.rgb, (value.a * 255.0f) / 127.5f);
+	o_col0 = vec4(value.rgb, (value.a * 255.0f + 0.1f) / 127.5f);
 }
 #endif
 
@@ -122,7 +122,7 @@ void ps_rta_correction()
 void ps_rta_decorrection()
 {
 	vec4 value = sample_c(v_tex);
-	o_col0 = vec4(value.rgb, (value.a * 127.5f) / 255.0f);
+	o_col0 = vec4(value.rgb, (value.a * 127.5f + 0.1f) / 255.0f);
 }
 #endif
 

pcsx2/GS/Renderers/Metal/convert.metal

@@ -129,13 +129,13 @@ fragment float4 ps_primid_rta_init_datm0(float4 p [[position]], DirectReadTextur
 fragment float4 ps_rta_correction(float4 p [[position]], DirectReadTextureIn<float> tex)
 {
 	float4 in = tex.read(p);
-	return float4(in.rgb, (in.a * 255.f) / 127.5f);
+	return float4(in.rgb, (in.a * 255.f + 0.1f) / 127.5f);
 }
 
 fragment float4 ps_rta_decorrection(float4 p [[position]], DirectReadTextureIn<float> tex)
 {
 	float4 in = tex.read(p);
-	return float4(in.rgb, (in.a * 127.5f) / 255.f);
+	return float4(in.rgb, (in.a * 127.5f + 0.1f) / 255.f);
 }
 
 fragment float4 ps_hdr_init(float4 p [[position]], DirectReadTextureIn<float> tex)