球.gif
image.png
setupRC函数
创建需要的小球，地板，加载图像为2D纹理
void SetupRC()
{
//1.设置清屏颜色到颜色缓存区
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
//2.初始化着色器管理器
shaderManager.InitializeStockShaders();
//3.开启深度测试/背面剔除
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
//4.设置大球球
gltMakeSphere(torusBatch, 0.4f, 40, 80);
//5.设置小球(公转自转)
gltMakeSphere(sphereBatch, 0.1f, 26, 13);
//6.设置地板顶点数据&地板纹理
GLfloat texSize = 10.0f;
floorBatch.Begin(GL_TRIANGLE_FAN, 4,1);
floorBatch.MultiTexCoord2f(0, 0.0f, 0.0f);
floorBatch.Vertex3f(-20.f, -0.41f, 20.0f);
floorBatch.MultiTexCoord2f(0, texSize, 0.0f);
floorBatch.Vertex3f(20.0f, -0.41f, 20.f);
floorBatch.MultiTexCoord2f(0, texSize, texSize);
floorBatch.Vertex3f(20.0f, -0.41f, -20.0f);
floorBatch.MultiTexCoord2f(0, 0.0f, texSize);
floorBatch.Vertex3f(-20.0f, -0.41f, -20.0f);
floorBatch.End();
//7.随机小球球顶点坐标数据
for (int i = 0; i < NUM_SPHERES; i++) {
//y轴不变，X,Z产生随机值
GLfloat x = ((GLfloat)((rand() % 400) - 200 ) * 0.1f);
GLfloat z = ((GLfloat)((rand() % 400) - 200 ) * 0.1f);
//在y方向，将球体设置为0.0的位置，这使得它们看起来是飘浮在眼睛的高度
//对spheres数组中的每一个顶点，设置顶点数据
spheres[i].SetOrigin(x, 0.0f, z);
}
//8.命名纹理对象
glGenTextures(3, uiTextures);
//9.将TGA文件加载为2D纹理。
//参数1：纹理文件名称
//参数2&参数3：需要缩小&放大的过滤器
//参数4：纹理坐标环绕模式
glBindTexture(GL_TEXTURE_2D, uiTextures[0]);
LoadTGATexture("marble.tga", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D, uiTextures[1]);
LoadTGATexture("marslike.tga", GL_LINEAR_MIPMAP_LINEAR,
GL_LINEAR, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, uiTextures[2]);
LoadTGATexture("moonlike.tga", GL_LINEAR_MIPMAP_LINEAR,
GL_LINEAR, GL_CLAMP_TO_EDGE);
}
渲染
//进行调用以绘制场景
void RenderScene(void)
{
//1.地板颜色值
static GLfloat vFloorColor[] = { 1.0f, 1.0f, 0.0f, 0.75f};
//2.基于时间动画
static CStopWatch rotTimer;
float yRot = rotTimer.GetElapsedSeconds() * 60.0f;
//3.清除颜色缓存区和深度缓冲区
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//4.压入栈(栈顶)
modelViewMatrix.PushMatrix();
//5.设置观察者矩阵
M3DMatrix44f mCamera;
cameraFrame.GetCameraMatrix(mCamera);
modelViewMatrix.MultMatrix(mCamera);
//6.压栈(镜面)
modelViewMatrix.PushMatrix();
//7.---添加反光效果---
//翻转Y轴
modelViewMatrix.Scale(1.0f, -1.0f, 1.0f);
//镜面世界围绕Y轴平移一定间距
modelViewMatrix.Translate(0.0f, 0.8f, 0.0f);
//8.指定顺时针为正面
glFrontFace(GL_CW);
//9.绘制地面以外其他部分(镜面)
drawSomething(yRot);
//10.恢复为逆时针为正面
glFrontFace(GL_CCW);
//11.绘制镜面，恢复矩阵
modelViewMatrix.PopMatrix();
//12.开启混合功能(绘制地板)
glEnable(GL_BLEND);
//13. 指定glBlendFunc 颜色混合方程式
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//14.绑定地面纹理
glBindTexture(GL_TEXTURE_2D, uiTextures[0]);
/*15.
纹理调整着色器(将一个基本色乘以一个取自纹理的单元nTextureUnit的纹理)
参数1：GLT_SHADER_TEXTURE_MODULATE
参数2：模型视图投影矩阵
参数3：颜色
参数4：纹理单元（第0层的纹理单元）
*/
shaderManager.UseStockShader(GLT_SHADER_TEXTURE_MODULATE,
transformPipeline.GetModelViewProjectionMatrix(),
vFloorColor,
0);
//shaderManager.UseStockShader(GLT_SHADER_TEXTURE_REPLACE,transformPipeline.GetModelViewProjectionMatrix(),0);
//开始绘制
floorBatch.Draw();
//取消混合
glDisable(GL_BLEND);
//16.绘制地面以外其他部分
drawSomething(yRot);
//17.绘制完，恢复矩阵
modelViewMatrix.PopMatrix();
//18.交换缓存区
glutSwapBuffers();
//19.提交重新渲染
glutPostRedisplay();
}
大小球的渲染是相同的，我们可以将功能抽离出来
void drawSomething(GLfloat yRot)
{
//1.定义光源位置&漫反射颜色
static GLfloat vWhite[] = { 1.0f, 1.0f, 1.0f, 1.0f };
static GLfloat vLightPos[] = { 0.0f, 3.0f, 0.0f, 1.0f };
//2.绘制悬浮小球球
glBindTexture(GL_TEXTURE_2D, uiTextures[2]);
for(int i = 0; i < NUM_SPHERES; i++) {
modelViewMatrix.PushMatrix();
modelViewMatrix.MultMatrix(spheres[i]);
shaderManager.UseStockShader(GLT_SHADER_TEXTURE_POINT_LIGHT_DIFF,
modelViewMatrix.GetMatrix(),
transformPipeline.GetProjectionMatrix(),
vLightPos,
vWhite,
0);
sphereBatch.Draw();
modelViewMatrix.PopMatrix();
}
//3.绘制大球球
modelViewMatrix.Translate(0.0f, 0.2f, -2.5f);
modelViewMatrix.PushMatrix();
modelViewMatrix.Rotate(yRot, 0.0f, 1.0f, 0.0f);
glBindTexture(GL_TEXTURE_2D, uiTextures[1]);
shaderManager.UseStockShader(GLT_SHADER_TEXTURE_POINT_LIGHT_DIFF,
modelViewMatrix.GetMatrix(),
transformPipeline.GetProjectionMatrix(),
vLightPos,
vWhite,
0);
torusBatch.Draw();
modelViewMatrix.PopMatrix();
//4.绘制公转小球球（公转自转)
modelViewMatrix.PushMatrix();
modelViewMatrix.Rotate(yRot * -2.0f, 0.0f, 1.0f, 0.0f);
modelViewMatrix.Translate(0.8f, 0.0f, 0.0f);
glBindTexture(GL_TEXTURE_2D, uiTextures[2]);
shaderManager.UseStockShader(GLT_SHADER_TEXTURE_POINT_LIGHT_DIFF,
modelViewMatrix.GetMatrix(),
transformPipeline.GetProjectionMatrix(),
vLightPos,
vWhite,
0);
sphereBatch.Draw();
modelViewMatrix.PopMatrix();
}
键位控制
//**3.移动照相机参考帧，来对方向键作出响应
void SpeacialKeys(int key,int x,int y)
{
float linear = 0.1f;
float angular = float(m3dDegToRad(5.0f));
if (key == GLUT_KEY_UP) {
//MoveForward 平移
cameraFrame.MoveForward(linear);
}
if (key == GLUT_KEY_DOWN) {
cameraFrame.MoveForward(-linear);
}
if (key == GLUT_KEY_LEFT) {
//RotateWorld 旋转
cameraFrame.RotateWorld(angular, 0.0f, 1.0f, 0.0f);
}
if (key == GLUT_KEY_RIGHT) {
cameraFrame.RotateWorld(-angular, 0.0f, 1.0f, 0.0f);
}
}
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