运行时的控制.cpp

C++源代码集

//glHint()函数控制复杂绘制过程的例子
#include<windows.h>

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<time.h>
#include<GL\glaux.h>

#pragma comment (lib,"opengl32")
#pragma comment (lib,"glaux")
#pragma comment (lib,"glu32")

#define  GAP  10
#define  ROWS 1
#define  COLS 4

static void CALLBACK Resize(int width,int height);
static void CALLBACK Key_a(void);
static void CALLBACK Key_d(void);
static void CALLBACK Key_f(void);
static void CALLBACK Key_F(void);
static void CALLBACK Key_s(void);
static void CALLBACK Key_t(void);
static void Viewport(GLint row,GLint column);
static double Now(void);
static void Points(void);
static void Lines(void);
static void Triangles(void);
static void Rects(void);
static void CALLBACK Paint(void);
static GLenum Args(int argc,char** argv);

GLenum rgb,doubleBuffer,windType;
GLint windW,windH;

GLint boxW,boxH;

GLenum antialiasing=GL_FALSE;
GLenum depthTesting=GL_FALSE;
GLenum fogging=GL_FALSE,niceFogging=GL_FALSE;
GLenum lighting=GL_FALSE;
GLenum shading=GL_FALSE;
GLenum texturing=GL_FALSE;

GLint repeatCount=100;
GLint loopCount=10;

GLubyte texture[12]={
	0xff,0,0,0,0,0,
	0,0,0,0,0xff,0
};

static void CALLBACK Resize(int width,int height)
{
	windW=(GLint)width;
	windH=(GLint)height;
}

static void CALLBACK Key_a(void)
{
	antialiasing=!antialiasing;
}

static void CALLBACK Key_d(void)
{
	depthTesting=!depthTesting;
}

static void CALLBACK Key_f(void)
{
	fogging=!fogging;
}

static void CALLBACK Key_F(void)
{
	niceFogging=!niceFogging;
}

static void CALLBACK Key_s(void)
{
	shading=!shading;
}

static void CALLBACK Key_t(void)
{
	texturing=!texturing;
}

static void Viewport(GLint row,GLint colum)
{
	GLint x,y;
	boxW=(windW-(COLS+1)*GAP)/COLS;
	boxH=(windH-(ROWS+1)*GAP)/ROWS;
	x=GAP+colum*(boxW+GAP);
	y=GAP+row*(boxW+GAP);
	glViewport(x,y,boxW,boxH);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(-boxW/2,boxW/2,-boxH/2,boxH/2);
	glMatrixMode(GL_MODELVIEW);
	glEnable(GL_SCISSOR_TEST);
	glScissor(x,y,boxW,boxH);
}

static double Now(void)
{
	long sec;
	sec=time(NULL);
	return(sec);
}

static void Points(void)
{
	GLint i,j;
	float v1[3];
	double start;
	start=Now();
	for(i=0;i<repeatCount;i++)
	{
		v1[0]=10;
		v1[1]=10;
		v1[2]=10;
		glBegin(GL_POINTS);
		   for(j=0;j<loopCount;j++)
			   glVertex2fv(v1);
		glEnd();
	}
	glFinish();
}

static void Lines(void)
{
	GLint i,j;
	float v1[3],v2[3];
	double start;

	start=Now();
	for(i=0;i<repeatCount;i++)
	{
		v1[0]=10;
		v1[1]=10;
		v1[2]=10;
		v2[0]=20;
		v2[1]=20;
		v2[2]=10;
		glBegin(GL_LINES);
		   for(j=0;j<loopCount;j++)
		   {
			   glVertex2fv(v1);
			   glVertex2fv(v2);
		   }
		glEnd();
	}
	glFinish();
}

static void Triangles(void)
{
	GLint i,j;
	float v1[3],v2[3],v3[3],t1[2],t2[2],t3[2];
	double start;

	start=Now();

	v1[0]=10;
	v1[1]=10;
	v1[2]=10;
	v2[0]=20;
	v2[1]=20;
	v2[2]=10;
	v3[0]=10;
	v3[1]=20;
	v3[2]=10;

	t1[0]=0;
	t1[1]=0;
	t2[0]=1;
	t2[1]=1;
	t3[0]=0;
	t3[1]=1;

	for(i=0;i<repeatCount;i++)
	{
		glBegin(GL_TRIANGLES);
		   for(j=0;j<loopCount;j++)
		   {
			   if(texturing)
				   glTexCoord2fv(t1);
			   glVertex2fv(v1);
			   if(texturing)
				   glTexCoord2fv(t2);
			   glVertex2fv(v2);
			   if(texturing)
				   glTexCoord2fv(t3);
			   glVertex2fv(v3);
		   }
		glEnd();
	}
	glFinish();
}

static void Rects(void)
{
	GLint i,j;
	float v1[2],v2[2];
	double start;

	start = Now();
	for(i=0;i<repeatCount;i++)
	{
		v1[0]=10;
		v1[1]=10;
		v2[0]=20;
		v2[1]=20;
		for(j=0;j<loopCount;j++)
			glRectfv(v1,v2);
	}
	glFinish();
}

static void CALLBACK Paint(void)
{
	glDisable(GL_SCISSOR_TEST);

	glClearColor(1.0,1.0,1.0,1.0);
	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

	AUX_SETCOLOR(windType,AUX_BLACK);

	if(antialiasing)
	{
		glBlendFunc(GL_SRC_ALPHA,GL_ZERO);
		glEnable(GL_BLEND);

		glEnable(GL_POINT_SMOOTH);
		glEnable(GL_LINE_SMOOTH);
		glEnable(GL_POLYGON_SMOOTH);
	}

	if(depthTesting)
		glEnable(GL_DEPTH_TEST);

	if(fogging)
	{
		glEnable(GL_FOG);
		glHint(GL_FOG_HINT,(niceFogging)?GL_NICEST:GL_FASTEST);
	}

	if(lighting)
	{
		static GLfloat ambient[4]={1,0.5,0.5,0};

		glEnable(GL_NORMALIZE);
		glNormal3f(1.0,1.0,1.0);
		glLightModelfv(GL_LIGHT_MODEL_AMBIENT,ambient);
		glEnable(GL_LIGHTING);
		glEnable(GL_LIGHT0);
	}

	(shading)?glShadeModel(GL_SMOOTH):glShadeModel(GL_FLAT);
	if(texturing)
	{
		static GLfloat modulate[1]={GL_DECAL};
		static GLfloat clamp[1]={GL_CLAMP};
		static GLfloat linear[1]={GL_LINEAR};

		glPixelStorei(GL_UNPACK_ALIGNMENT,1);
		glTexImage2D(GL_TEXTURE_2D,0,3,2,2,0,GL_RGB
			,GL_UNSIGNED_BYTE,(GLvoid*)texture);
		glTexEnvfv(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,modulate);
		glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,clamp);
		glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,clamp);
		glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,linear);
		glTexParameterfv(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,linear);
		glEnable(GL_TEXTURE_2D);
	}

	Viewport(0,0);
	Points();

	Viewport(0,1);
	Lines();

	Viewport(0,2);
	Triangles();

	Viewport(0,3);
	Rects();

	glFlush();

	if(doubleBuffer)
		auxSwapBuffers();
}

static GLenum Args(int argc,char **argv)
{
	GLint i;

	rgb=GL_TRUE;
	doubleBuffer=GL_FALSE;

	for(i=1;i<argc;i++)
	{
		if(strcmp(argv[i],"-ci")==0)
			rgb=GL_FALSE;
		else if(strcmp(argv[i],"-rgb")==0)
			rgb=GL_TRUE;
		else if(strcmp(argv[i],"-sb")==0)
			doubleBuffer=GL_FALSE;
		else if(strcmp(argv[i],"-db")==0)
			doubleBuffer=GL_TRUE;
		else
			return GL_FALSE;
	}
	return GL_TRUE;
}

void main(int argc,char** argv)
{
	if(Args(argc,argv)==GL_FALSE)
		auxQuit();

	windW=600;
	windH=300;
	auxInitPosition(0,0,windW,windH);

	windType=AUX_DEPTH16;
	windType|=(rgb)?AUX_RGB:AUX_INDEX;
	windType|=(doubleBuffer)?AUX_DOUBLE:AUX_SINGLE;

	auxInitDisplayMode(windType);

	if(auxInitWindow("速度测试")==GL_FALSE)
		auxQuit();

	auxExposeFunc((AUXEXPOSEPROC)Resize);
	auxReshapeFunc((AUXRESHAPEPROC)Resize);
	auxKeyFunc(AUX_a,Key_a);
	auxKeyFunc(AUX_d,Key_d);
	auxKeyFunc(AUX_f,Key_f);
	auxKeyFunc(AUX_F,Key_F);
	auxKeyFunc(AUX_s,Key_s);
	auxKeyFunc(AUX_t,Key_t);
	auxMainLoop(Paint);
}