OPENGL学习视频（九）

实现三维移动模型:

添加类Transform

#include <glm/gtx/transform.hpp>

class Transform

{

   public :

       Transform(const glm::vec& pos =glm::vec3(),

        const glm::vec3&rot=glm::vec3(),

        const gm::vec4 &scale=glm::vec3(1.0f,1.0f,1.0f)

         {

            this->pos=pos;

            this->rot=rot;

            this->scale=scale;

         } );

      ~ Transform();

       inline glm::vec3*GetPos(){return &pos；}

       inline  glm::vec3*GetPos(){return &rot;   }

       inline  glm::vec3*GetScale(){return &scale;}

      inline void SetPos(glm::vec3&  pos) {this->pos=pos；}

      inline void SetRot(glm::vec3&  rot)   {this->rot=rot；}

      inline void  SetScale(glm::vec3& scale){this->scale=scale;}

      inline glm::mat4  GetModel()const

      {

           glm::mat4   posMat=glm::translate(pos);

           glm::mat4   scaleMat=glm::scale(scale);

           glm::mat4    rotX=glm::rotate(rot.x,glm::vec3(1.0,0.0,0.0));

           glm::mat4    rotY=glm::rotate(rot.y,glm::vec3(0.0,1.0,0.0));

          glm::mat4     rotZ=glm::rotate(rot.z,glm::vec3(0.0,0.0,1.0));

          glm::mat4    rotMat=rotX*rotY*rotZ;

         return posMat*scaleMat;

      }

      

   private:

       glm::vec3 pos;

       glm::vec3 rot;

       glm::vec3 scale；

}

修改着色basicShader.vs

uniform vec2 texCoord0;

void main()

{

   gl_Position=transform*vec4(position,1.0);

   texCoord0=texCoord;

}

在shader.h中创建枚举类型

enum{

    TRANSFORM_U,

    NUM_UNIFORM

};

GLuint m_uniforms[NUM_UNIFORM];

在shader.cpp中

m_uniforms[TRANSFORM_U]=glGetUniformLocation(m_program,"transform");//获取到着色器程序中uniform对应的值

添加函数void Update(const Transform&  transform);

实现函数void Update(const Transform & transform)//直接改变图形的绘制

{

   glm::mat4  model=transform.GetModel();

   glUniformMatrix4fv(m_uniforms[TRANSFORM_U],1,GL_FALSE,&model[0][0]);

}

通过着色漆把图形绘制出来

Transform transform;

float sinCounter=sinf(counter);

transform.GetPos()->x=sinCounter;

transform.GetRot()->z=counter*50;

shader.Update(transform);

counter+=0.01f;