PostProcessing: Avoid creating zero-sized intermediate targets

src/util/postprocessing_shader_fx.cpp

@@ -1586,8 +1586,8 @@ bool PostProcessing::ReShadeFXShader::ResizeTargets(u32 source_width, u32 source
     if (!tex.render_target)
       continue;
 
-    const u32 t_width = (tex.render_target_width > 0) ? tex.render_target_width : target_width;
-    const u32 t_height = (tex.render_target_height > 0) ? tex.render_target_height : target_height;
+    const u32 t_width = (tex.render_target_width > 0) ? tex.render_target_width : std::max<u32>(target_width, 1);
+    const u32 t_height = (tex.render_target_height > 0) ? tex.render_target_height : std::max<u32>(target_height, 1);
     if (!g_gpu_device->ResizeTexture(&tex.texture, t_width, t_height, GPUTexture::Type::RenderTarget, tex.format,
                                      tex.storage_access ? GPUTexture::Flags::AllowBindAsImage : GPUTexture::Flags::None,
                                      false, error))

src/util/postprocessing_shader_slang.cpp

@@ -1996,10 +1996,12 @@ bool PostProcessing::SlangShader::ResizeTargets(u32 source_width, u32 source_hei
     if (pass.output_texture_id < 0)
       continue;
 
-    const u32 tex_width =
-      apply_scale(pass.output_scale[0].first, pass.output_scale[0].second, prev_width, viewport_width, source_width);
-    const u32 tex_height =
-      apply_scale(pass.output_scale[1].first, pass.output_scale[1].second, prev_height, viewport_height, source_height);
+    const u32 tex_width = std::max<u32>(
+      apply_scale(pass.output_scale[0].first, pass.output_scale[0].second, prev_width, viewport_width, source_width),
+      1);
+    const u32 tex_height = std::max<u32>(
+      apply_scale(pass.output_scale[1].first, pass.output_scale[1].second, prev_height, viewport_height, source_height),
+      1);
 
     // Source for the next pass is the previous pass's output.
     prev_width = tex_width;