vk_rasterizer: Set render area to max when no framebuffers are bound (#3227)

src/video_core/renderer_vulkan/vk_instance.h

@@ -324,11 +324,21 @@ public:
         return properties.limits.maxViewportDimensions[0];
     }
 
-    ///  Returns the maximum viewport height.
+    /// Returns the maximum viewport height.
     u32 GetMaxViewportHeight() const {
         return properties.limits.maxViewportDimensions[1];
     }
 
+    /// Returns the maximum render area width.
+    u32 GetMaxFramebufferWidth() const {
+        return properties.limits.maxFramebufferWidth;
+    }
+
+    /// Returns the maximum render area height.
+    u32 GetMaxFramebufferHeight() const {
+        return properties.limits.maxFramebufferHeight;
+    }
+
     /// Returns the sample count flags supported by framebuffers.
     vk::SampleCountFlags GetFramebufferSampleCounts() const {
         return properties.limits.framebufferColorSampleCounts &

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -113,6 +113,8 @@ RenderState Rasterizer::PrepareRenderState(u32 mrt_mask) {
     // Prefetch color and depth buffers to let texture cache handle possible overlaps with bound
     // textures (e.g. mipgen)
     RenderState state;
+    state.width = instance.GetMaxFramebufferWidth();
+    state.height = instance.GetMaxFramebufferHeight();
 
     cb_descs.clear();
     db_desc.reset();

src/video_core/renderer_vulkan/vk_scheduler.cpp

@@ -34,16 +34,11 @@ void Scheduler::BeginRendering(const RenderState& new_state) {
     is_rendering = true;
     render_state = new_state;
 
-    const auto width =
-        render_state.width != std::numeric_limits<u32>::max() ? render_state.width : 1;
-    const auto height =
-        render_state.height != std::numeric_limits<u32>::max() ? render_state.height : 1;
-
     const vk::RenderingInfo rendering_info = {
         .renderArea =
             {
                 .offset = {0, 0},
-                .extent = {width, height},
+                .extent = {render_state.width, render_state.height},
             },
         .layerCount = 1,
         .colorAttachmentCount = render_state.num_color_attachments,

src/video_core/renderer_vulkan/vk_scheduler.h

@@ -26,8 +26,8 @@ struct RenderState {
     u32 num_color_attachments{};
     bool has_depth{};
     bool has_stencil{};
-    u32 width = std::numeric_limits<u32>::max();
-    u32 height = std::numeric_limits<u32>::max();
+    u32 width{};
+    u32 height{};
 
     bool operator==(const RenderState& other) const noexcept {
         return std::memcmp(this, &other, sizeof(RenderState)) == 0;