问题描述
我需要在Button上单击opengl纹理上绘制一个正方形。我需要在广场后面的opengl纹理。广场不应该被填满，只需要画出广场的ouline。
我尝试过的事情：
我的按钮点击代码显示方块是
void OverlayDisplayDlg :: DrawImage（）
{
glClear（GL_COLOR_BUFFER_BIT）; //清除颜色缓冲区
glMatrixMode（GL_MODELVIEW）; //操作模型 - 视图矩阵
glLoadIdentity（）; //重置模型视图矩阵
glPushMatrix（）;
glBegin（GL_QUADS）; //每组4个顶点形成一个四元组
//glColor3f(1.0f,0.0f,0.0f); //红色
glVertex2f（-0.3f，-0.3f）; //以逆时针（CCW）顺序定义顶点
glVertex2f（0.3f，-0.3f）; //使正常（正面）面向你
glVertex2f（0.3f，0.3f）;
glVertex2f（-0.3f，0.3f）;
glEnd（）;
glPopMatrix（）;
SwapBuffers（m_hDeviceContextDC）;
}
void OverlayDisplayDlg :: OnDrawBnClickedButton1（）
{
DrawImage（）;
}
并显示纹理
void OverlayDisplayDlg :: DisplayTexture（）
{
GLuint glTexture;
glTexture = ApplyTexture（）;
glEnable（GL_TEXTURE_2D）;
glBindTexture（GL_TEXTURE_2D ，glTexture）;
glBegin（GL_QUADS）;
glTexCoord2d（0.0,0.0）;
glVertex2f（-0.8f，-0.8f）;
glTexCoord2d（1.0,0.0）;
glVertex2f（0.8f，-0.8f）;
glTexCoord2d（1.0,1.0）;
glVertex2f（0.8f，0.8f）;
glTexCoord2d（0.0,1.0）;
glVertex2f（-0.8f，0.8f）;
glEnd（）;
SwapBuffers（m_hDeviceContextDC）;
glDisable（GL_TEXTURE_2D）;
}
GLuint OverlayDisplayDlg :: ApplyTexture（）
{
ReadData（_T（D：\\ Bin Files \ \InputData_1280_690.bin））;
GLuint glTexture;
glClear（GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT）;
glEnable（GL_TEXTURE_2D）;
glGenTextures（1，& glTexture）;
glBindTexture（GL_TEXTURE_2D，glTexture）;
glTexEnvf（GL_TEXTURE_ENV，GL_TEXTURE_ENV_MODE，GL_MODULATE）; //选择调制以将纹理与颜色混合以进行着色
glTexParameteri（GL_TEXTURE_2D，GL_TEXTURE_MIN_FILTER，GL_NEAREST）; //当纹理区域很小时，双线性过滤最近的mipmap
glTexParameteri（GL_TEXTURE_2D，GL_TEXTURE_MAG_FILTER，GL_NEAREST）; //当纹理区域很大时，双线性过滤原始的
glTexParameteri（GL_TEXTURE_2D，GL_TEXTURE_WRAP_S，GL_REPEAT）; //纹理在边缘处包裹（重复）
glTexParameteri（GL_TEXTURE_2D，GL_TEXTURE_WRAP_T，GL_REPEAT）;
glTexImage2D（GL_TEXTURE_2D，0，GL_RGBA，WIDTH，HEIGHT，0 ，GL_LUMINANCE，GL_UNSIGNED_BYTE，m_pbyImageData）; //将纹理应用图像显示到屏幕
glDisable（GL_TEXTURE_2D）;
glDisable（GL_COLOR_MATERIAL）;
返回glTexture;
}
void OverlayDisplayDlg :: Initialize（void）
{
PIXELFORMATDESCRIPTOR pfPixelFormator;
memset（& pfPixelFormator，0，sizeof（PIXELFORMATDESCRIPTOR））;
pfPixelFormator.nSize = sizeof （PIXELFORMATDESCRIPTOR）;
pfPixelFormator.cColorBits = 24;
pfPixelFormator.cDepthBits = 8;
pfPixelFormator.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
pfPixelFormator.iPixelType = PFD_TYPE_RGBA;
pfPixelFormator.nVersion = 1;
// CClientDC ClientDC （this）;
// m_hDeviceContextDC = ClientDC.GetSafeHdc（）;
CWnd * pPictureWnd = GetDlgItem（IDC_STATIC_PICTURE）;
m_hDeviceContextDC = pPictureWnd - > GetDC（） - > GetSafeHdc（）;
int nPixelFormat = ChoosePixelFormat（m_hDeviceContextDC，& pfPixelFormator）;
SetPixelFormat（m_hDeviceContextDC，nPixelFormat，& pfPixelFormator ）;
m_hRenderContextRC = wglCreateContext（m_hDeviceContextDC）;
wglMakeCurrent（m_hDeviceContextDC，m_hRenderContextRC）;
glClearColor（0.1f，0.7f，0.9f ，1.0f）;
glClearDepth（1.0f）;
DisplayTexture（）;
}
请帮我解决这个问题。我在我的程序的Onpaint中调用初始化函数。
I need to draw a square on Button click over an opengl texture . I need that opengl texture behind the square. The square should not be filled, just the ouline of square should be drawn.
What I have tried:
My button click code to display square is
void OverlayDisplayDlg :: DrawImage()
{
glClear(GL_COLOR_BUFFER_BIT); // Clear the color buffer
glMatrixMode(GL_MODELVIEW); // To operate on Model-View matrix
glLoadIdentity(); // Reset the model-view matrix
glPushMatrix();
glBegin(GL_QUADS); // Each set of 4 vertices form a quad
//glColor3f(1.0f, 0.0f, 0.0f); // Red
glVertex2f(-0.3f, -0.3f); // Define vertices in counter-clockwise (CCW) order
glVertex2f( 0.3f, -0.3f); // so that the normal (front-face) is facing you
glVertex2f( 0.3f, 0.3f);
glVertex2f(-0.3f, 0.3f);
glEnd();
glPopMatrix();
SwapBuffers( m_hDeviceContextDC );
}
void OverlayDisplayDlg::OnDrawBnClickedButton1()
{
DrawImage();
}
and to display texture is
void OverlayDisplayDlg::DisplayTexture()
{
GLuint glTexture;
glTexture = ApplyTexture();
glEnable( GL_TEXTURE_2D );
glBindTexture( GL_TEXTURE_2D, glTexture );
glBegin( GL_QUADS );
glTexCoord2d(0.0,0.0);
glVertex2f( -0.8f, -0.8f );
glTexCoord2d( 1.0,0.0 );
glVertex2f( 0.8f, -0.8f );
glTexCoord2d( 1.0,1.0 );
glVertex2f( 0.8f, 0.8f );
glTexCoord2d( 0.0,1.0 );
glVertex2f( -0.8f, 0.8f );
glEnd();
SwapBuffers( m_hDeviceContextDC );
glDisable( GL_TEXTURE_2D );
}
GLuint OverlayDisplayDlg :: ApplyTexture()
{
ReadData( _T( "D:\\Bin Files\\InputData_1280_690.bin" ));
GLuint glTexture ;
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glEnable( GL_TEXTURE_2D );
glGenTextures( 1, &glTexture );
glBindTexture( GL_TEXTURE_2D, glTexture );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ); // Select modulate to mix texture with color for shading
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); // When texture area is small, bilinear filter the closest mipmap
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST ); // When texture area is large, bilinear filter the original
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT ); // The texture wraps over at the edges (repeat)
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, WIDTH, HEIGHT, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, m_pbyImageData ); // To dislay texture applied image to screen
glDisable( GL_TEXTURE_2D );
glDisable( GL_COLOR_MATERIAL );
return glTexture;
}
void OverlayDisplayDlg::Initialize(void)
{
PIXELFORMATDESCRIPTOR pfPixelFormator ;
memset( &pfPixelFormator, 0, sizeof( PIXELFORMATDESCRIPTOR ));
pfPixelFormator.nSize = sizeof( PIXELFORMATDESCRIPTOR );
pfPixelFormator.cColorBits = 24;
pfPixelFormator.cDepthBits = 8;
pfPixelFormator.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER ;
pfPixelFormator.iPixelType = PFD_TYPE_RGBA;
pfPixelFormator.nVersion = 1;
//CClientDC ClientDC(this);
//m_hDeviceContextDC = ClientDC.GetSafeHdc();
CWnd* pPictureWnd = GetDlgItem( IDC_STATIC_PICTURE );
m_hDeviceContextDC = pPictureWnd->GetDC()->GetSafeHdc();
int nPixelFormat = ChoosePixelFormat( m_hDeviceContextDC, &pfPixelFormator );
SetPixelFormat( m_hDeviceContextDC,nPixelFormat, &pfPixelFormator );
m_hRenderContextRC = wglCreateContext( m_hDeviceContextDC );
wglMakeCurrent( m_hDeviceContextDC, m_hRenderContextRC );
glClearColor( 0.1f, 0.7f, 0.9f, 1.0f );
glClearDepth( 1.0f );
DisplayTexture();
}
Please help me to solve this. Im calling the initialize function in Onpaint of my program.
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