增加圆形几何体生成

example/Vulkan/Geometry2D.cpp

@@ -109,9 +109,6 @@ public:
 };//class RenderableInstance
 VK_NAMESPACE_END
 
-constexpr uint32_t VERTEX_COUNT=4;
-
-
 class TestApp:public VulkanApplicationFramework
 {
 private:
@@ -167,13 +164,25 @@ private:
 
         //render_obj=CreateRectangle(device,material,&rci);
 
-        struct RoundRectangleCreateInfo rrci;
+        //struct RoundRectangleCreateInfo rrci;
 
-        rrci.scope.Set(10,10,SCREEN_WIDTH-20,SCREEN_HEIGHT-20);
-        rrci.radius=8;     //半径为8
-        rrci.round_per=8;   //圆角切分成8段
+        //rrci.scope.Set(10,10,SCREEN_WIDTH-20,SCREEN_HEIGHT-20);
+        //rrci.radius=8;     //半径为8
+        //rrci.round_per=8;   //圆角切分成8段
 
-        render_obj=CreateRoundRectangle(device,material,&rrci);
+        //render_obj=CreateRoundRectangle(device,material,&rrci);
+
+        struct CircleCreateInfo cci;
+
+        cci.center.x=SCREEN_WIDTH/2;
+        cci.center.y=SCREEN_HEIGHT/2;
+
+        cci.radius.x=SCREEN_WIDTH*0.45;
+        cci.radius.y=SCREEN_HEIGHT*0.45;
+
+        cci.field_count=8;
+
+        render_obj=CreateCircle(device,material,&cci);
 
         return render_obj;
     }

inc/hgl/graph/InlineGeometry.h

@@ -34,9 +34,12 @@ namespace hgl
          */
          struct CircleCreateInfo
          {
-            Vector2f center;
+            Vector2f center;            //圆心坐标
+            Vector2f radius;            //半径
             uint field_count;           //分段次数
          };
+
+         vulkan::Renderable *CreateCircle(vulkan::Device *device,vulkan::Material *mtl,const CircleCreateInfo *rci);
     }//namespace graph
 };//namespace hgl
 #endif//HGL_GRAPH_INLINE_GEOMETRY_INCLUDE

src/SceneGraph/InlineGeometry.cpp

@@ -12,27 +12,21 @@ namespace hgl
         {
             const vulkan::VertexShaderModule *vsm=mtl->GetVertexShaderModule();
 
-            vulkan::Renderable *render_obj=mtl->CreateRenderable(4);
-
             const int vertex_binding=vsm->GetStageInputBinding("Vertex");
 
-            if(vertex_binding!=-1)
-            {
-                VB2f *vertex=new VB2f(4);
+            if(vertex_binding==-1)
+                return(nullptr);
+            
+            VB2f *vertex=new VB2f(4);
 
-                vertex->Begin();
-                vertex->WriteRectFan(rci->scope);
-                vertex->End();
+            vertex->Begin();
+            vertex->WriteRectFan(rci->scope);
+            vertex->End();
 
-                render_obj->Set(vertex_binding,device->CreateVBO(vertex));
-                delete vertex;
-            }
-            else
-            {
-               delete render_obj;
-                return nullptr;
-            }
+            vulkan::Renderable *render_obj=mtl->CreateRenderable(vertex->GetCount());
+            render_obj->Set(vertex_binding,device->CreateVBO(vertex));
 
+            delete vertex;
             return render_obj;
         }
 
@@ -114,7 +108,40 @@ namespace hgl
             render_obj->Set(vertex_binding,device->CreateVBO(vertex));
 
             delete vertex;
+            return render_obj;
+        }
 
+        vulkan::Renderable *CreateCircle(vulkan::Device *device,vulkan::Material *mtl,const CircleCreateInfo *cci)
+        {            
+            const vulkan::VertexShaderModule *vsm=mtl->GetVertexShaderModule();
+
+            const int vertex_binding=vsm->GetStageInputBinding("Vertex");
+
+            if(vertex_binding==-1)
+                return(nullptr);
+
+            VB2f *vertex=new VB2f(cci->field_count+2);
+
+            vertex->Begin();
+
+            vertex->Write(cci->center.x,cci->center.y);
+
+            for(uint i=0;i<=cci->field_count;i++)
+            {
+                float ang=float(i)/float(cci->field_count)*360.0f;
+
+                float x=cci->center.x+sin(hgl_ang2rad(ang))*cci->radius.x;
+                float y=cci->center.y+cos(hgl_ang2rad(ang))*cci->radius.y;
+                    
+                vertex->Write(x,y);
+            }
+
+            vertex->End();
+
+            vulkan::Renderable *render_obj=mtl->CreateRenderable(vertex->GetCount());
+            render_obj->Set(vertex_binding,device->CreateVBO(vertex));
+
+            delete vertex;
             return render_obj;
         }
     }//namespace graph