所谓批处理：就是尽量将数据和绘制指令一次提交，来减少cpu和GPU的通信进行的一种优化。

Buffer处理

可以直接通过数量创建

RendererCommand

• 也可以通过索引的数量创建多个物体

Renderer2d

新增Flush函数： * 新增quad结构体 * 新增Renderer2Ddata，包含最大quad数，顶点数、索引数、顶点数组及地顶点缓冲和shader等结构，以及对应的QuadVertexBufferBase，QuadVertexBufferPtr。

每次绘制的时候++Ptr，最后算大小，再一起发送给GPU，此为批处理

    void Renderer2D::DrawQuad(const glm::vec3& position, const glm::vec2& size, const glm::vec4& color)
    {
        CD_PROFILE_FUNCTION();
        //传入位置、颜色、大小自动生成纹理坐标
        s_Data.QuadVertexBufferPtr->Position = position;
        s_Data.QuadVertexBufferPtr->Color = color;
        s_Data.QuadVertexBufferPtr->TexCoord = { 0.0f, 0.0f };
        s_Data.QuadVertexBufferPtr++;
        s_Data.QuadVertexBufferPtr->Position = { position.x + size.x, position.y, 0.0f };
        s_Data.QuadVertexBufferPtr->Color = color;
        s_Data.QuadVertexBufferPtr->TexCoord = { 1.0f, 0.0f };
        s_Data.QuadVertexBufferPtr++;
        s_Data.QuadVertexBufferPtr->Position = { position.x + size.x, position.y + size.y, 0.0f };
        s_Data.QuadVertexBufferPtr->Color = color;
        s_Data.QuadVertexBufferPtr->TexCoord = { 1.0f, 1.0f };
        s_Data.QuadVertexBufferPtr++;
        s_Data.QuadVertexBufferPtr->Position = { position.x, position.y + size.y, 0.0f };
        s_Data.QuadVertexBufferPtr->Color = color;
        s_Data.QuadVertexBufferPtr->TexCoord = { 0.0f, 1.0f };
        s_Data.QuadVertexBufferPtr++;
        s_Data.QuadIndexCount += 6;
        /*s_Data.TextureShader->SetFloat("u_TilingFactor", 1.0f);
        s_Data.WhiteTexture->Bind();
        glm::mat4 transform = glm::translate(glm::mat4(1.0f), position)
            * glm::scale(glm::mat4(1.0f), { size.x, size.y, 1.0f });
    s_Data.TextureShader->SetMat4("u_Transform", transform);
        s_Data.QuadVertexArray->Bind();
        RenderCommand::DrawIndexed(s_Data.QuadVertexArray);*/
    }