1.在上篇代码中新增代码
//key,特殊按键编码，x,y位置 void SpecialKeys(int key, int x, int y) { GLfloat stepSize = 0.025f; //增加的步量 GLfloat blockX = 0; GLfloat blockY = 0; //上 if (key == GLUT_KEY_UP) { blockY += stepSize; } //下 if (key == GLUT_KEY_DOWN) { blockY -= stepSize; } //左 if (key == GLUT_KEY_LEFT) { blockX -= stepSize; } //右 if (key == GLUT_KEY_RIGHT) { blockX += stepSize; } std::cout << "blockX = " << blockX << std::endl; std::cout << "blockY = " << blockY << std::endl; //改变顶点数据 vVertex[0] = vVertex[0] + blockX; vVertex[1] = vVertex[1] + blockY; vVertex[3] = vVertex[3] + blockX; vVertex[4] = vVertex[4] + blockY; vVertex[6] = vVertex[6] + blockX; vVertex[7] = vVertex[7] + blockY; batch.CopyVertexData3f(vVertex); //复制顶点到批处理中 glutPostRedisplay(); //更新窗口内容 } glutSpecialFunc(SpecialKeys); //特殊按键回调2.完整代码
#include <GLTools.h> #include <GLShaderManager.h> #include <GL/glut.h> GLBatch batch; //批处理 GLShaderManager shaderManager; //着色器管理 //定义顶点数据 GLfloat vVertex[] = { -0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f, 0.0f, 0.5f, 0.0f }; void ChangeSize(int width, int height) { glViewport(0, 0, width, height); //改变窗口大小 } void SetupRc(void) { glClearColor(0.0f, 0.0f, 1.0f, 1.0f); //背景颜色 shaderManager.InitializeStockShaders(); //初始化着色器 batch.Begin(GL_TRIANGLES, 3); batch.CopyVertexData3f(vVertex); //复制顶点数据到批处理中 batch.End(); } void MyDisplay(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); //清除特定的缓冲区 GLfloat vRed[] = { 0.0f, 1.0f, 0.0f, 1.0f }; //RGBA shaderManager.UseStockShader(GLT_SHADER_IDENTITY ,vRed); //颜色传递到存储着色器中 batch.Draw(); //绘制 glutSwapBuffers(); //交换buffer，双缓冲 } //key,特殊按键编码，x,y位置 void SpecialKeys(int key, int x, int y) { GLfloat stepSize = 0.025f; //增加的步量 GLfloat blockX = 0; GLfloat blockY = 0; //上 if (key == GLUT_KEY_UP) { blockY += stepSize; } //下 if (key == GLUT_KEY_DOWN) { blockY -= stepSize; } //左 if (key == GLUT_KEY_LEFT) { blockX -= stepSize; } //右 if (key == GLUT_KEY_RIGHT) { blockX += stepSize; } //改变顶点数据 vVertex[0] = vVertex[0] + blockX; vVertex[1] = vVertex[1] + blockY; vVertex[3] = vVertex[3] + blockX; vVertex[4] = vVertex[4] + blockY; vVertex[6] = vVertex[6] + blockX; vVertex[7] = vVertex[7] + blockY; batch.CopyVertexData3f(vVertex); //复制顶点到批处理中 glutPostRedisplay(); //更新窗口内容 } int main(int argc, char * argv[]) { gltSetWorkingDirectory(argv[0]); //设置工作目录 glutInit(&argc, argv); //初始化glut glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL); //显示类型模式 glutInitWindowSize(800, 600); //窗口大小 glutCreateWindow("第一个OpenGL"); //创建窗口 glutReshapeFunc(ChangeSize); //改变窗口大小 glutDisplayFunc(MyDisplay); //显示绘制回调 glutSpecialFunc(SpecialKeys); //特殊按键回调 GLenum err = glewInit(); //驱动程序初始化过程是否出错 if (err != GLEW_OK) { return 1; } SetupRc(); glutMainLoop(); //调用之后才能显示 return 0; }按上下左右键移动三角形
