Fix issue showing whole pass in mesh viewer with inverse view height

* In particular this was breaking if not all draws in the pass used an inverse
  view (unlikely in practice, but comes up in our tests).

renderdoc/data/glsl/glsl_ubos.h

@@ -39,7 +39,8 @@ BINDING(0) uniform MeshUBOData
   uint homogenousInput;
   vec2 pointSpriteSize;
   uint rawoutput;
-  vec3 padding;
+  uint flipY;
+  vec2 padding;
 }
 INST_NAME(Mesh);
 

renderdoc/data/glsl/mesh.vert

@@ -67,6 +67,10 @@ void main(void)
 #ifdef VULKAN
   // GL->VK conventions
   gl_Position.y = -gl_Position.y;
+  if(Mesh.flipY == 1)
+  {
+    gl_Position.y = -gl_Position.y;
+  }
   if(Mesh.rawoutput == 0)
   {
     gl_Position.z = (gl_Position.z + gl_Position.w) / 2.0;

renderdoc/driver/vulkan/vk_overlay.cpp

@@ -2315,7 +2315,8 @@ ResourceId VulkanReplay::RenderOverlay(ResourceId texid, FloatVector clearCol, D
         data->pointSpriteSize = Vec2f(0.0f, 0.0f);
         data->displayFormat = 0;
         data->rawoutput = 1;
-        data->padding = Vec3f();
+        data->flipY = 0;
+        data->padding = Vec2f();
         m_MeshRender.UBO.Unmap();
 
         uint32_t viewOffs = 0;

renderdoc/driver/vulkan/vk_rendermesh.cpp

@@ -528,6 +528,7 @@ void VulkanReplay::RenderMesh(uint32_t eventId, const rdcarray<MeshFormat> &seco
         data->pointSpriteSize = Vec2f(0.0f, 0.0f);
         data->displayFormat = MESHDISPLAY_SOLID;
         data->rawoutput = 0;
+        data->flipY = (cfg.position.flipY == fmt.flipY) ? 0 : 1;
 
         m_MeshRender.UBO.Unmap();