GPU/HW: Avoid texture filter dual-source output when unnecessary

Because we all know how much mobile drivers crapping themselves
whenever anyone mutters dual-source blending.

src/core/gpu_hw.cpp

@@ -1275,6 +1275,9 @@ bool GPU_HW::CompilePipelines(Error* error)
                 const bool uv_limits = ShouldClampUVs(sprite ? m_sprite_texture_filtering : m_texture_filtering);
                 const BatchTextureMode shader_texmode = static_cast<BatchTextureMode>(
                   texture_mode - (sprite ? static_cast<u8>(BatchTextureMode::SpriteStart) : 0));
+                const GPUTextureFilter texture_filter = sprite ? m_sprite_texture_filtering : m_texture_filtering;
+                const bool texture_filter_is_blended =
+                  (shader_texmode != BatchTextureMode::Disabled && IsBlendedTextureFiltering(texture_filter));
                 const bool use_rov =
                   (render_mode == static_cast<u8>(BatchRenderMode::ShaderBlend) && m_use_rov_for_shader_blend);
                 const bool rov_depth_test = (use_rov && depth_test != 0);
@@ -1282,11 +1285,11 @@ bool GPU_HW::CompilePipelines(Error* error)
                                                                   GPUTransparencyMode::Disabled);
                 const std::string fs = shadergen.GenerateBatchFragmentShader(
                   static_cast<BatchRenderMode>(render_mode), static_cast<GPUTransparencyMode>(transparency_mode),
-                  shader_texmode, sprite ? m_sprite_texture_filtering : m_texture_filtering, upscaled, msaa,
-                  per_sample_shading, uv_limits, !sprite && force_round_texcoords, true_color,
-                  ConvertToBoolUnchecked(dithering), scaled_dithering, disable_color_perspective,
-                  ConvertToBoolUnchecked(interlacing), scaled_interlacing, ConvertToBoolUnchecked(check_mask),
-                  m_write_mask_as_depth, use_rov, needs_rov_depth, rov_depth_test, rov_depth_write);
+                  shader_texmode, texture_filter, texture_filter_is_blended, upscaled, msaa, per_sample_shading,
+                  uv_limits, !sprite && force_round_texcoords, true_color, ConvertToBoolUnchecked(dithering),
+                  scaled_dithering, disable_color_perspective, ConvertToBoolUnchecked(interlacing), scaled_interlacing,
+                  ConvertToBoolUnchecked(check_mask), m_write_mask_as_depth, use_rov, needs_rov_depth, rov_depth_test,
+                  rov_depth_write);
 
                 if (!(batch_fragment_shaders[depth_test][render_mode][transparency_mode][texture_mode][check_mask]
                                             [dithering][interlacing] = g_gpu_device->CreateShader(

src/core/gpu_hw_shadergen.cpp

@@ -1078,10 +1078,10 @@ void FilteredSampleFromVRAM(TEXPAGE_VALUE texpage, float2 coords, float4 uv_limi
 
 std::string GPU_HW_ShaderGen::GenerateBatchFragmentShader(
   GPU_HW::BatchRenderMode render_mode, GPUTransparencyMode transparency, GPU_HW::BatchTextureMode texture_mode,
-  GPUTextureFilter texture_filtering, bool upscaled, bool msaa, bool per_sample_shading, bool uv_limits,
-  bool force_round_texcoords, bool true_color, bool dithering, bool scaled_dithering, bool disable_color_perspective,
-  bool interlacing, bool scaled_interlacing, bool check_mask, bool write_mask_as_depth, bool use_rov,
-  bool use_rov_depth, bool rov_depth_test, bool rov_depth_write) const
+  GPUTextureFilter texture_filtering, bool is_blended_texture_filtering, bool upscaled, bool msaa,
+  bool per_sample_shading, bool uv_limits, bool force_round_texcoords, bool true_color, bool dithering,
+  bool scaled_dithering, bool disable_color_perspective, bool interlacing, bool scaled_interlacing, bool check_mask,
+  bool write_mask_as_depth, bool use_rov, bool use_rov_depth, bool rov_depth_test, bool rov_depth_write) const
 {
   DebugAssert(!true_color || !dithering); // Should not be doing dithering+true color.
 
@@ -1096,7 +1096,7 @@ std::string GPU_HW_ShaderGen::GenerateBatchFragmentShader(
   const bool use_dual_source = (!shader_blending && !use_rov && m_supports_dual_source_blend &&
                                 ((render_mode != GPU_HW::BatchRenderMode::TransparencyDisabled &&
                                   render_mode != GPU_HW::BatchRenderMode::OnlyOpaque) ||
-                                 texture_filtering != GPUTextureFilter::Nearest));
+                                 is_blended_texture_filtering));
 
   std::stringstream ss;
   WriteHeader(ss, use_rov, shader_blending && !use_rov, use_dual_source);

src/core/gpu_hw_shadergen.h

@@ -20,12 +20,12 @@ public:
                                         bool disable_color_perspective) const;
   std::string GenerateBatchFragmentShader(GPU_HW::BatchRenderMode render_mode, GPUTransparencyMode transparency,
                                           GPU_HW::BatchTextureMode texture_mode, GPUTextureFilter texture_filtering,
-                                          bool upscaled, bool msaa, bool per_sample_shading, bool uv_limits,
-                                          bool force_round_texcoords, bool true_color, bool dithering,
-                                          bool scaled_dithering, bool disable_color_perspective, bool interlacing,
-                                          bool scaled_interlacing, bool check_mask, bool write_mask_as_depth,
-                                          bool use_rov, bool use_rov_depth, bool rov_depth_test,
-                                          bool rov_depth_write) const;
+                                          bool is_blended_texture_filtering, bool upscaled, bool msaa,
+                                          bool per_sample_shading, bool uv_limits, bool force_round_texcoords,
+                                          bool true_color, bool dithering, bool scaled_dithering,
+                                          bool disable_color_perspective, bool interlacing, bool scaled_interlacing,
+                                          bool check_mask, bool write_mask_as_depth, bool use_rov, bool use_rov_depth,
+                                          bool rov_depth_test, bool rov_depth_write) const;
   std::string GenerateWireframeGeometryShader() const;
   std::string GenerateWireframeFragmentShader() const;
   std::string GenerateVRAMReadFragmentShader(u32 resolution_scale, u32 multisamples) const;