rsx: Implement point sprite coordinate generation

- When the point sprite flag is set, overrides the input similar to the
2D mask. The returned X and Y values are always the gl_PointCoord values
for the fragment.
- Stacks with the 2D mask to override the z and w coordinates.

rpcs3/Emu/RSX/Common/FragmentProgramDecompiler.cpp

@@ -579,10 +579,24 @@ template<typename T> std::string FragmentProgramDecompiler::GetSRC(T src)
 		case 0xD:
 		{
 			// TEX0 - TEX9
-			// Texcoord mask seems to reset the last 2 arguments to 0 and 1 if set
-			if (m_prog.texcoord_is_2d(dst.src_attr_reg_num - 4))
+			// Texcoord 2d mask seems to reset the last 2 arguments to 0 and w if set
+			const u8 texcoord = u8(dst.src_attr_reg_num) - 4;
+			if (m_prog.texcoord_is_point_coord(texcoord))
 			{
-				ret += getFloatTypeName(4) + "(" + reg_var + ".x, " + reg_var + ".y, 0., in_w)";
+				// Point sprite coord generation. Stacks with the 2D override mask.
+				if (m_prog.texcoord_is_2d(texcoord))
+				{
+					ret += getFloatTypeName(4) + "(gl_PointCoord, 0., in_w)";
+					properties.has_w_access = true;
+				}
+				else
+				{
+					ret += getFloatTypeName(4) + "(gl_PointCoord, 1., 0.)";
+				}
+			}
+			else if (m_prog.texcoord_is_2d(texcoord))
+			{
+				ret += getFloatTypeName(4) + "(" + reg_var + ".xy, 0., in_w)";
 				properties.has_w_access = true;
 			}
 			else

rpcs3/Emu/RSX/RSXFragmentProgram.h

@@ -251,7 +251,13 @@ struct RSXFragmentProgram
 
 	bool texcoord_is_2d(u8 index) const
 	{
-		return !!(texcoord_control_mask & (1u << index));
+		return bool(texcoord_control_mask & (1u << index));
+	}
+
+	bool texcoord_is_point_coord(u8 index) const
+	{
+		index += 16;
+		return bool(texcoord_control_mask & (1u << index));
 	}
 
 	RSXFragmentProgram()

rpcs3/Emu/RSX/RSXThread.cpp

@@ -1698,6 +1698,13 @@ namespace rsx
 		result.redirected_textures = 0;
 		result.shadow_textures = 0;
 
+		if (method_registers.current_draw_clause.primitive == primitive_type::points &&
+			method_registers.point_sprite_enabled())
+		{
+			// Set high word of the control mask to store point sprite control
+			result.texcoord_control_mask |= u32(method_registers.point_sprite_control_mask()) << 16;
+		}
+
 		const auto resolution_scale = rsx::get_resolution_scale();
 
 		for (u32 i = 0; i < rsx::limits::fragment_textures_count; ++i)

rpcs3/Emu/RSX/rsx_decode.h

@@ -3256,6 +3256,35 @@ struct registers_decoder<NV4097_SET_POINT_SIZE>
 	}
 };
 
+template<>
+struct registers_decoder<NV4097_SET_POINT_SPRITE_CONTROL>
+{
+	struct decoded_type
+	{
+	private:
+		u32 value;
+
+	public:
+		decoded_type(u32 value) : value(value) {}
+
+		bool enabled() const
+		{
+			return bf_decoder<0, 1, bool>(value);
+		}
+
+		u16 texcoord_mask() const
+		{
+			return bf_decoder<8, 10>(value);
+		}
+	};
+
+	static std::string dump(decoded_type &&decoded_values)
+	{
+		return "Point sprite: enabled = " + print_boolean(decoded_values.enabled()) +
+			"override mask = " + fmt::format("0x%x", decoded_values.texcoord_mask());
+	}
+};
+
 template<>
 struct registers_decoder<NV4097_SET_SURFACE_FORMAT>
 {

rpcs3/Emu/RSX/rsx_methods.h

@@ -1102,6 +1102,11 @@ namespace rsx
 			return decode<NV4097_SET_POINT_SIZE>().point_size();
 		}
 
+		bool point_sprite_enabled() const
+		{
+			return decode<NV4097_SET_POINT_SPRITE_CONTROL>().enabled();
+		}
+
 		u8 alpha_ref() const
 		{
 			return decode<NV4097_SET_ALPHA_REF>().alpha_ref();
@@ -1677,10 +1682,10 @@ namespace rsx
 			return decode<NV4097_SET_CONTROL0>().depth_float();
 		}
 
-		u32 texcoord_control_mask()
+		u16 texcoord_control_mask() const
 		{
 			// Only 10 texture coords exist [0-9]
-			u32 control_mask = 0;
+			u16 control_mask = 0;
 			for (u8 index = 0; index < 10; ++index)
 			{
 				control_mask |= ((registers[NV4097_SET_TEX_COORD_CONTROL + index] & 1) << index);
@@ -1688,6 +1693,11 @@ namespace rsx
 
 			return control_mask;
 		}
+
+		u16 point_sprite_control_mask() const
+		{
+			return decode<NV4097_SET_POINT_SPRITE_CONTROL>().texcoord_mask();
+		}
 	};
 
 	extern rsx_state method_registers;