OpenGL_ES1.1在wince6.0的初始化。

#include <EGL/egl.h>
#include <GLES/gl.h>
#include "ximage.h"
#pragma comment(lib, "libEGL.lib")
#pragma comment(lib, "libGLESv1_CM.lib")

#define glF(x)	((GLfixed)((x)*(1<<16)))
#define GL_F	GL_FIXED
typedef GLfixed GLf;

#define PI 3.141592653

class COpenGLES
{
public:
	COpenGLES(void);
	~COpenGLES(void);

	EGLConfig	m_EGLXConfig;
	EGLContext	m_EGLXContext;
	EGLSurface	m_EGLXSurface;
	EGLDisplay	m_EGLXDisplay;
	EGLint		m_EGLXNumOfConfigs;


	EGLint max_num_config;
	NativeDisplayType g_dpy;

	HWND m_hwnd;

	BOOL CreateEGL(HWND hwnd);
	void DeleteEGL();
	void glPerspectivef(GLfloat fov, GLfloat aspect, GLfloat near_val, GLfloat far_val);
	void SetProjectToOrtho(void);
	void SetProjectToFrustum();

	void EGLFlush();
	bool Init(HWND m_hWnd);
	void InitGLES();
	void CloseGLES();


};

　cpp

COpenGLES::COpenGLES(void)
{
}

COpenGLES::~COpenGLES(void)
{
}
BOOL COpenGLES::CreateEGL(HWND hwnd)
{
	m_hwnd = hwnd;

	EGLint const attrib_list[] = {
		EGL_RED_SIZE, 5,  
		EGL_GREEN_SIZE, 6,
		EGL_BLUE_SIZE, 5,   
		EGL_ALPHA_SIZE, 0,  
		EGL_RENDERABLE_TYPE, 
		EGL_OPENGL_ES_BIT, 
		EGL_SURFACE_TYPE,
		EGL_WINDOW_BIT,  
		EGL_SAMPLE_BUFFERS, GL_FALSE,
		EGL_NONE 
	};

	EGLint ai32ContextAttribs[] = { EGL_CONTEXT_CLIENT_VERSION, 1, EGL_NONE };

	EGLConfig *configs = NULL;

	g_dpy = ::GetDC(hwnd);

	EGLint major, minor, num_config;

	m_EGLXDisplay = eglGetDisplay( g_dpy );

	if ( EGL_NO_DISPLAY == m_EGLXDisplay )
	{
		printf( "eglGetDisplay() failed (error 0x%x)\n", eglGetError() );
		return 0;
	}

	if ( EGL_FALSE == eglInitialize( m_EGLXDisplay, &major, &minor ) )
	{
		printf( "eglInitialize() failed (error 0x%x)\n", eglGetError() );
		return 0;
	}

	if ( EGL_FALSE == eglGetConfigs(m_EGLXDisplay, NULL, 0, &max_num_config) )
	{
		return 0;
	}
	if(max_num_config <= 0)
	{
		return 0;
	}
	configs = (EGLConfig *)malloc( sizeof( EGLConfig) * max_num_config );
	if ( NULL == configs )
	{
		return 0;
	}
	printf("max_num_config=%d\n",max_num_config);//23
	if ( EGL_FALSE == eglChooseConfig( m_EGLXDisplay, attrib_list, configs,max_num_config, &m_EGLXNumOfConfigs ) )
	{
		printf( "eglChooseConfig() failed (error 0x%x)\n", eglGetError() );
		return 0;
	}
	printf("m_EGLXNumOfConfigs=%d\n",m_EGLXNumOfConfigs);//8
	if ( 0 == m_EGLXNumOfConfigs )
	{
		printf( "eglChooseConfig() was unable to find a suitable config\n" );
		return 0;
	}
	for (int i=0; i<m_EGLXNumOfConfigs; i++ )
	{
		EGLint value;


		eglGetConfigAttrib( m_EGLXDisplay, configs[i], EGL_RED_SIZE, &value );
		if ( 5 != value ) continue;
		eglGetConfigAttrib( m_EGLXDisplay, configs[i], EGL_GREEN_SIZE, &value );
		if ( 6 != value ) continue;
		eglGetConfigAttrib( m_EGLXDisplay, configs[i], EGL_BLUE_SIZE, &value );
		if ( 5 != value ) continue;
		eglGetConfigAttrib( m_EGLXDisplay, configs[i], EGL_ALPHA_SIZE, &value );
		if ( 0 != value ) continue;
		eglGetConfigAttrib( m_EGLXDisplay, configs[i], EGL_SAMPLES, &value );
		if ( 4 != value ) continue;

		m_EGLXConfig = configs[i];
		printf("i=%d\n",i);
		break;
	}
	m_EGLXSurface = eglCreateWindowSurface( m_EGLXDisplay, m_EGLXConfig, hwnd, 0 );	
	printf("m_EGLXSurface=%d\n",m_EGLXSurface);//m_EGLXSurface=536870913
	if ( EGL_NO_SURFACE == m_EGLXSurface )
	{
		printf( "eglCreateWindowSurface failed (error 0x%x)\n", eglGetError() );
		return 0;
	}
	m_EGLXContext = eglCreateContext( m_EGLXDisplay, m_EGLXConfig, EGL_NO_CONTEXT, ai32ContextAttribs );//创建RC
	if ( EGL_NO_CONTEXT == m_EGLXContext )
	{
		printf( "eglCreateContext failed (error 0x%x)\n", eglGetError() );
		return 0;
	}
	if ( EGL_FALSE == eglMakeCurrent( m_EGLXDisplay, m_EGLXSurface, m_EGLXSurface, m_EGLXContext ) )
	{
		printf( "eglMakeCurrent failed (error 0x%x)\n", eglGetError() );
		return 0;
	}		
	eglSwapInterval(m_EGLXDisplay,0);

	free( configs );
	return true;
}
void COpenGLES::DeleteEGL()
{
	eglMakeCurrent(m_EGLXDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	eglDestroyContext(m_EGLXDisplay, m_EGLXContext);
	eglDestroySurface(m_EGLXDisplay, m_EGLXSurface);	
	eglTerminate(m_EGLXDisplay);
}
void COpenGLES::glPerspectivef(GLfloat fov, GLfloat aspect, GLfloat near_val, GLfloat far_val)
{
	GLfloat top = (GLfloat)(tan(fov*0.5) * near_val);
	GLfloat bottom = -top;
	GLfloat left = aspect * bottom;
	GLfloat right = aspect * top;
	printf("left  = %lf,right = %lf,bottom = %lf ,top = %lf,near =%lf,far = %lf\n",
		left,right,bottom,top,near_val,far_val);
	glFrustumx(glF(left), glF(right), glF(bottom), glF(top), glF(near_val),glF(far_val));

}

void COpenGLES::InitGLES()
{
	//设置视口大小
	
	//设置裁剪区域
	//glScissor(0,0,800,480);	
	//设置模型视图矩阵
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//打开状态
	glEnable(GL_NORMALIZE);  //自动归一化法向量
	glEnable(GL_COLOR_MATERIAL);//允许颜色材质

	glEnable(GL_DEPTH_TEST);  //将被遮挡的表面隐藏掉
	glEnable(GL_TEXTURE_2D);  
	glEnable(GL_CULL_FACE);//不计算多边形背面

	//背面不贴图
	glCullFace(GL_BACK);

	glFrontFace(GL_CCW);   //多边形逆时针方向是正面
	glDepthFunc(GL_LEQUAL);	


	//对透视进行修正
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

	glClearColor(0.0f, 1.0f, 0.0f, 0.5f);						// Black Background
	glClearDepthf(1.0f);		

	/*glEnable(GL_ALPHA_TEST);
	glAlphaFunc(GL_NOTEQUAL,0.0f);*/
	glEnable(GL_BLEND);

	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);	//(源，目标)

	//启动阴影平滑
	glShadeModel(GL_SMOOTH);

	glDisableClientState(GL_COLOR_ARRAY);
	glEnableClientState(GL_VERTEX_ARRAY);
	glEnableClientState(GL_TEXTURE_COORD_ARRAY);	
	//取消抖动
	glDisable(GL_DITHER);

	//完成
	glFinish();

}


//************************************
// Method:    OrthoBegin
// FullName:  COpenGLES::OrthoBegin
// Access:    public 
// Returns:   void
// Qualifier:
// Parameter: void  平行投影 范围是左下角（0，0）右上角（800，480）
//************************************
void COpenGLES::SetProjectToOrtho(void)
{
	
	glViewport(0, 0, 800, 480);
	glDisable(GL_DEPTH_TEST);
	glDisable(GL_CULL_FACE);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	glOrthof(0.0f,  800.0f,  0.0f,  480.0f,  -10.0f,  10.0f);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

}
void COpenGLES::SetProjectToFrustum()
{

	glViewport(0,0,800,480); 
	//设置重置投影
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	//透视处理
	//glPerspectivef(45.0f,(GLfloat)800/(GLfloat)480,0.01f,1000.0f);
	glFrustumx(glF(-5.0f), glF(5.0f), glF(-3.0f), glF(3.0f), glF(10.0f),glF(1000.0f));//左右上下近远
	//near far 参数均为正值，left为负值，right为正值，top为正值，bottom为负值
	//left(right)与bottom(top)保持屏幕的纵横比关系
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//完成
	glFinish();

}
void COpenGLES::EGLFlush()
{
	glFlush();
	eglSwapBuffers(m_EGLXDisplay,m_EGLXSurface);
}
bool COpenGLES::Init(HWND m_hWnd)
{
	if(!CreateEGL(m_hWnd))
		return false;
	InitGLES();
	SetProjectToFrustum();//开始默认设置为透视投影矩阵
	return TRUE;
}

void COpenGLES::CloseGLES()
{	
	DeleteEGL();
	RETAILMSG(1,(TEXT("==APP==END\n")));
}

　使用：

COpenGLES gl;
gl.Init(m_hWnd);
gl.SetProjectToOrtho();

在函数CreateEGL中

m_EGLXSurface = eglCreateWindowSurface( m_EGLXDisplay, m_EGLXConfig, hwnd, 0 );

第三个参数，可以传入对话框的句柄，这样，opengles与gdi使用同一个窗口。

如果传入null，GDI无法在窗口上绘图。这样如果要在屏幕上输出字符比较麻烦。（这种情况，我先将字符转为纹理，再输出）。

发表于 2011-12-20 17:21 ezhong 阅读(1171) 评论(0) 编辑收藏举报

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