修改底层渲染为OpenGL

source/EngineFrame/Component/Canvas.cpp

@@ -0,0 +1,62 @@
+#include "Canvas.h"
+#include "EngineCore/Game.h"
+#include "EngineFrame/Render/RenderManager.h"
+Canvas::Canvas(VecSize size)
+{
+    m_texture = new Texture();
+    m_texture->Init(size);
+    m_sprite = new Sprite();
+    m_sprite->SetTexture(m_texture);
+
+    Actor::Init();
+
+    glGenFramebuffers(1, &m_fbo);
+    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
+    // 将目标纹理附加到FBO的颜色附着点
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER,       // 帧缓冲类型
+        GL_COLOR_ATTACHMENT0, // 颜色附着点（可多个，这里用第一个）
+        GL_TEXTURE_2D,        // 纹理类型
+        m_texture->getID(),   // 目标纹理ID
+        0                     // 多级渐远纹理级别
+    );
+    glBindFramebuffer(GL_FRAMEBUFFER, 0); // 解绑FBO
+}
+
+void Canvas::PreRender()
+{
+    if (m_dirty)
+    {
+        glBindFramebuffer(GL_FRAMEBUFFER, m_fbo); // 绑定FBO
+        // glViewport(0, 0, m_texture->getSize().width, m_texture->getSize().height);
+        glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // 全透明黑色
+        glClear(GL_COLOR_BUFFER_BIT);
+        Actor::PreRender();
+    }
+    else
+    {
+        m_sprite->PreRender();
+    }
+}
+
+void Canvas::Render()
+{
+    if (m_dirty)
+    {
+
+        Actor::Render();
+        glBindFramebuffer(GL_FRAMEBUFFER, 0); // 解绑FBO
+        // glViewport(0, 0, Game::GetInstance().Screen_W, Game::GetInstance().Screen_H);
+        m_dirty = false;
+    }
+    RenderManager *renderer = Game::GetInstance().GetRenderer();
+    renderer->SetCurrentShaderProgram("flip_y");
+    m_sprite->Render();
+    renderer->SetCurrentShaderProgram("normal");
+}
+
+void Canvas::AddChild(RefPtr<BaseNode> child)
+{
+    m_dirty = true;
+    Actor::AddChild(child);
+}