sample25-triangle-fps

#include <math.h>
#include <stdio.h>
#include <stdlib.h>//glut.hより先にインクルード
#include <gl/glew.h>//glut.hより先にインクルード
#include <gl/glut.h>

#define M_PI 3.141592

static
int angle=0;
float tx=0.0;
float ty=0.0;
float tz=0.0;
float sx=1.0;
float sy=1.0;
float sz=1.0;
double tx_p=0;
double ty_p=0;
double tz_p=0;
double sx_p=0;
double sy_p=0;
double sz_p=0;

//static unsigned int fps_start=0;
//static unsigned int fps_frames=0;
//  The number of frames
int frameCount = 0;
float fps = 0;

//  currentTime - previousTime is the time elapsed
//  between every call of theIdle function
int currentTime = 0, previousTime = 0;

//  printf prints to file. printw prints to window
//void printw (float x, float y, float z, char* format, ...);

void calculateFPS();

//void drawFPS();

//------- 頂点データ-----------//
//｢6｣面､｢4｣頂点､1頂点はx,y,zの｢3｣要素
GLfloat vertexAry[3][3] =
{
    {0.0f,0.6f,0.0f},{-0.6f,0.0f,0.0f},
    {0.6f,0.0f,0.0f}
};

//法線データ
GLfloat normalAry[3][3] =
{
    {0.0f,0.6f,0.0f},{-0.6f,0.0f,0.0f},
    {0.6f,0.0f,0.0f}
};

//色データ
GLfloat colorAry[3][3] =
{
    {0.0f,0.6f,0.0f},{-0.6f,0.0f,0.0f},
    {0.6f,0.0f,0.0f}
};
//インデックス
GLint indexAry[]=
{
    0,1,2
};

// π/180の値
const float PI_OVER_180 = 0.0174532925f;

//VBO用ID
GLuint VboId[3];//３つ分
GLuint VboIndex;//インデックス

//描画関数
void drawAry(void)
{
    GLfloat *clientPtr;//クライアント側用
    GLfloat tmp[3];
    int idloop;
    int loop;
    static float angle = 2*PI_OVER_180;

    //データの場所を知らせる
    //座標
    glBindBuffer(GL_ARRAY_BUFFER,VboId[0]);
    glVertexPointer(3, GL_FLOAT, 0, 0);
    //法線
    glBindBuffer(GL_ARRAY_BUFFER,VboId[1]);
    glNormalPointer(GL_FLOAT, 0, 0);
    //色
    glBindBuffer(GL_ARRAY_BUFFER,VboId[2]);
    glColorPointer(3,GL_FLOAT, 0, 0);
    //インデックスもバインド
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, VboIndex);

    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_NORMAL_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);
    //描画
    glDrawElements(GL_TRIANGLES,3,GL_UNSIGNED_INT,0);

    glDisableClientState(GL_COLOR_ARRAY);
    glDisableClientState(GL_NORMAL_ARRAY);
    glDisableClientState(GL_VERTEX_ARRAY);

    //座標と法線を回転させる
    //for(idloop = 0; idloop < 2;++idloop)
    {
        //idloop番目のバッファオブジェクトに注目
        //glBindBuffer(GL_ARRAY_BUFFER,VboId[idloop]);

        //対応付け
        clientPtr = (GLfloat *)glMapBuffer(GL_ARRAY_BUFFER,GL_READ_WRITE);

        if(clientPtr != NULL)
        {
            //24頂点*3座標
             for(loop = 0; loop < 3*3;loop += 3)    {
                //読み出し(READ)
                tmp[0] = clientPtr[loop];
                tmp[1] = clientPtr[loop+1];
                tmp[2] = clientPtr[loop+2];
                //書き込み(WRITE)
                clientPtr[loop] = cos(angle)*tmp[0]
                                    + sin(angle)*tmp[2];
                clientPtr[loop+1] = tmp[1];
                clientPtr[loop+2] = -sin(angle)*tmp[0]
                                        + cos(angle)*tmp[2];
             }
            glUnmapBuffer(GL_ARRAY_BUFFER);//対応付けの解放
        }
    }
    //クライアント側に戻す
    glBindBuffer(GL_ARRAY_BUFFER,0);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
//------- 各種コールバック----------//
void display(void)
{
    static int angle = 0;
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    gluLookAt(3.0, 4.0, 5.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0);

    glPushMatrix();
    calculateFPS();
    printf ("angle_x1_fps: %4.2f\n", fps);
    glRotatef(angle,1.0,0.0,0.0);//x軸回転
    glRotatef(angle+90,1.0,0.0,0.0);//x軸回転
    glRotatef(angle+180,1.0,0.0,0.0);//x軸回転
    calculateFPS();
    printf ("angle_x2_fps: %4.2f\n", fps);
    glRotatef(angle+270,1.0,0.0,0.0);//x軸回転
    glRotatef(angle+360,1.0,0.0,0.0);//x軸回転
    calculateFPS();
    printf ("angle_x3_fps: %4.2f\n", fps);
    calculateFPS();
    printf ("angle_y1_fps: %4.2f\n", fps);
    glRotatef(angle,0.0,1.0,0.0);
    glRotatef(angle+90,0.0,1.0,0.0);
    glRotatef(angle+180,0.0,1.0,0.0);
    calculateFPS();
    printf ("angle_y2_fps: %4.2f\n", fps);
    glRotatef(angle+270,0.0,1.0,0.0);
    glRotatef(angle+360,0.0,1.0,0.0);
    calculateFPS();
    printf ("angle_y3_fps: %4.2f\n", fps);
    calculateFPS();
    printf ("angle_z1_fps: %4.2f\n", fps);
    glRotatef(angle,0.0,0.0,1.0);
    glRotatef(angle+90,0.0,0.0,1.0);
    glRotatef(angle+180,0.0,0.0,1.0);
    calculateFPS();
    printf ("angle_z2_fps: %4.2f\n", fps);
    glRotatef(angle+270,0.0,0.0,1.0);
    glRotatef(angle+360,0.0,0.0,1.0);
    calculateFPS();
    printf ("angle_z3_fps: %4.2f\n", fps);
    calculateFPS();
    printf ("txyz1_fps: %4.2f\n", fps);
    glTranslatef(tx,ty,tz);
    calculateFPS();
    printf ("txyz2_fps: %4.2f\n", fps);
    glTranslatef(-1.0,-1.0,-1.0);
    calculateFPS();
    printf ("txyz3_fps: %4.2f\n", fps);
    calculateFPS();
    printf ("sxyz1_fps: %4.2f\n", fps);
    glScalef(sx, sy, sz);
    calculateFPS();
    printf ("sxyz2_fps: %4.2f\n", fps);
    glScalef(1.0, 1.0, 1.0);
    calculateFPS();
    printf ("sxyz3_fps: %4.2f\n", fps);
    drawAry();
    glPopMatrix();

     calculateFPS();
     //drawFPS();

    glutSwapBuffers();
    if(++angle >= 360) angle = 0;
}

void reshape(int w, int h)
{
    glViewport(0,0,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(30.0, double(w)/h, 0.1, 200.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

/*void idle(void)
{
    glutPostRedisplay();
}
*/
//------ その他初期設定-------//
void otherInit(void)
{
    glClearColor(1.f, 1.f, 1.f, 1.f);
    glEnable(GL_DEPTH_TEST);
    glColorMaterial(GL_FRONT,GL_AMBIENT_AND_DIFFUSE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHTING);
    glEnable(GL_NORMALIZE);//法線の正規化
}

//---- VBOの作成----//
void buildVBO(void)
{
    glGenBuffers(3,&VboId[0]);//座標､法線､色の３つ

    //頂点
    glBindBuffer(GL_ARRAY_BUFFER,VboId[0]);
    glBufferData(GL_ARRAY_BUFFER,sizeof(vertexAry),
                vertexAry,GL_DYNAMIC_DRAW);//データ変更する

    //法線
    glBindBuffer(GL_ARRAY_BUFFER,VboId[1]);
    glBufferData(GL_ARRAY_BUFFER,sizeof(normalAry),
                normalAry,GL_DYNAMIC_DRAW);//データ変更あり

    //色
    glBindBuffer(GL_ARRAY_BUFFER,VboId[2]);
    glBufferData(GL_ARRAY_BUFFER,sizeof(colorAry),
                    colorAry,GL_STREAM_DRAW);//データ変更なし

    //インデックス
    glGenBuffers(1,&VboIndex);
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,VboIndex);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER,sizeof(indexAry),
                    indexAry,GL_STATIC_DRAW);//データ変更なし
}

static void
idle()
{
    angle=0;
    //tx=fmodf(tx+0.01,10);
    //ty=fmodf(ty+0.01,10);
    //tz=fmodf(tz+0.01,10);
    //sx=fmodf(sx+0.01,10);
    //sy=fmodf(sy+0.01,10);
    //sz=fmodf(sz+0.01,10);
    tx_p=(tx_p+0.5)*M_PI;
    tx=(float)sin(tx_p);
    //printf("%f\n",tx);
    ty_p=(ty_p+0.5)*M_PI;
    ty=(float)sin(ty_p);
    //printf("%f\n",ty);
    tz_p=(tz_p+0.5)*M_PI;
    tz=(float)sin(tz_p);
    //printf("%f\n",tz);
    sx=2.0;
    sy=2.0;
    sz=2.0;
    glutPostRedisplay();
}

//-------------------------------------------------------------------------
// Calculates the frames per second
//-------------------------------------------------------------------------

void calculateFPS()
{
        //  Increase frame count
        frameCount++;

        //  Get the number of milliseconds since glutInit called
        //  (or first call to glutGet(GLUT ELAPSED TIME)).
        currentTime = glutGet(GLUT_ELAPSED_TIME);

        //  Calculate time passed
        int timeInterval = currentTime - previousTime;

        if(timeInterval > 1000)
        {
                //  calculate the number of frames per second

            fps = frameCount / (timeInterval / 1000.0f);
                //  Set time
                previousTime = currentTime;

                //  Reset frame count
                frameCount = 0;
        }

        //printf ("FPS: %4.2f\n", fps);

}


//-------------------------------------------------------------------------
//  Draw FPS
//-------------------------------------------------------------------------
/*
void drawFPS()
{
        //  Load the identity matrix so that FPS string being drawn
        //  won't get animates
        glLoadIdentity ();

        fps=glutGet(GLUT_ELAPSED_TIME);

        //  Print the FPS to the window
        printf ("FPS: %4.2f\n", fps);
}
 */

//----------- メイン関数------------//
int main(int argc, char *argv[])
{
    //GLUTの初期設定
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
    glutInitWindowSize(640,480);
    glutCreateWindow("VBO Sample");
    //GLEWの初期設定
    GLenum err = glewInit();
    if(err != GLEW_OK)
    {
        fprintf(stderr,"Err:%s\n",
            glewGetErrorString(err));
        return -1;
    }

    //拡張チェック
    if(!glewIsExtensionSupported(
                    "GL_ARB_vertex_buffer_object")){
        puts("you Can't use VBO");
        return -1;
    }

    //コールバック
    glutDisplayFunc(display);

    glutReshapeFunc(reshape);
    glutIdleFunc(idle);

    otherInit();
    buildVBO();//VBOの作成

    calculateFPS();
    //drawFPS();
    //fps=glutGet(GLUT_ELAPSED_TIME);

    glutMainLoop();

    return 0;
}