我想在 C++ 构建器中的表单内初始化 openGL 框架。我尝试复制此处提供的给定 openGL 启动代码的内容:http://edn.embarcadero.com/article/10528
我尝试用TFrame1替换TForm1,然后放入表单设计中,但没有成功。如何正确地做到这一点,有这方面的经验吗?
最佳答案
简单,只需使用TForm::Handle
作为窗口句柄...
这是我在BCB5中移植到BDS2006的一些古老示例:
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
#include <gl/gl.h>
#include <gl/glu.h>
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
int TForm1::ogl_init()
{
if (ogl_inicialized) return 1;
hdc = GetDC(Form1->Handle); // get device context
PIXELFORMATDESCRIPTOR pfd;
ZeroMemory( &pfd, sizeof( pfd ) ); // set the pixel format for the DC
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 24;
pfd.iLayerType = PFD_MAIN_PLANE;
SetPixelFormat(hdc,ChoosePixelFormat(hdc, &pfd),&pfd);
hrc = wglCreateContext(hdc); // create current rendering context
if(hrc == NULL)
{
ShowMessage("Could not initialize OpenGL Rendering context !!!");
ogl_inicialized=0;
return 0;
}
if(wglMakeCurrent(hdc, hrc) == false)
{
ShowMessage("Could not make current OpenGL Rendering context !!!");
wglDeleteContext(hrc); // destroy rendering context
ogl_inicialized=0;
return 0;
}
ogl_resize();
glEnable(GL_DEPTH_TEST); // Zbuf
glDisable(GL_CULL_FACE); // vynechavaj odvratene steny
glDisable(GL_TEXTURE_2D); // pouzivaj textury, farbu pouzivaj z textury
glDisable(GL_BLEND); // priehladnost
glShadeModel(GL_SMOOTH); // gourard shading
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); // background color
ogl_inicialized=1;
return 1;
}
//---------------------------------------------------------------------------
void TForm1::ogl_exit()
{
if (!ogl_inicialized) return;
wglMakeCurrent(NULL, NULL); // release current rendering context
wglDeleteContext(hrc); // destroy rendering context
ogl_inicialized=0;
}
//---------------------------------------------------------------------------
void TForm1::ogl_draw()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
float x=0.5,y=0.5,z=20.0;
glBegin(GL_QUADS);
glColor3f(0.0f, 1.0f, 0.0f);
glVertex3f(-x,-y,-z);
glVertex3f(-x,+y,-z);
glVertex3f(+x,+y,-z);
glVertex3f(+x,-y,-z);
glColor3f(0.0f, 0.0f, 1.0f);
glVertex3f(-x,-y,+z);
glVertex3f(-x,+y,+z);
glVertex3f(+x,+y,+z);
glVertex3f(+x,-y,+z);
glEnd();
glFlush();
SwapBuffers(hdc);
}
//---------------------------------------------------------------------------
void TForm1::ogl_resize()
{
xs=ClientWidth;
ys=ClientHeight;
if (xs<=0) xs = 1; // Prevent a divide by zero
if (ys<=0) ys = 1;
if (!ogl_inicialized) return;
glViewport(0,0,xs,ys); // Set Viewport to window dimensions
glMatrixMode(GL_PROJECTION); // operacie s projekcnou maticou
glLoadIdentity(); // jednotkova matica projekcie
gluPerspective(30,float(xs)/float(ys),0.1,100.0); // matica=perspektiva,120 stupnov premieta z viewsize do 0.1
glMatrixMode(GL_TEXTURE); // operacie s texturovou maticou
glLoadIdentity(); // jednotkova matica textury
glMatrixMode(GL_MODELVIEW); // operacie s modelovou maticou
glLoadIdentity(); // jednotkova matica modelu (objektu)
ogl_draw();
}
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
ogl_inicialized=0;
hdc=NULL;
hrc=NULL;
ogl_init();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormDestroy(TObject *Sender)
{
ogl_exit();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormResize(TObject *Sender)
{
ogl_resize();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormPaint(TObject *Sender)
{
ogl_draw();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
ogl_draw();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormMouseWheelDown(TObject *Sender, TShiftState Shift,
TPoint &MousePos, bool &Handled)
{
glMatrixMode(GL_PROJECTION);
glTranslatef(0,0,+2.0);
ogl_draw();
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormMouseWheelUp(TObject *Sender, TShiftState Shift,
TPoint &MousePos, bool &Handled)
{
glMatrixMode(GL_PROJECTION);
glTranslatef(0,0,-2.0);
ogl_draw();
}
//---------------------------------------------------------------------------
创建空的 1-Form 项目
将此添加到表单类 header 作为其用户定义的成员
int xs,ys; HDC hdc; // device context HGLRC hrc; // rendering context int ogl_inicialized; int ogl_init(); void ogl_exit(); void ogl_draw(); void ogl_resize();
添加计时器 ~ 20-40 毫秒
- 创建事件并复制主体以调整大小、重绘、定时器...以匹配上面的源代码
- 编译并运行
注释
- 并不要求所有OpenGL内容都是表单类的成员
- 计时器可以有任意间隔
- OpenGL 也可以只是窗口的一部分,而不仅仅是整个窗口
- 可以与VCL组件结合(使用按钮等面板,并将OpenGL调整为外部区域)
- 如果您无法让它工作,请评论我,但我认为没有什么困难......
- 不要忘记包含
gl.h
!!! - 如果一切正常,那么您应该在表单中心看到绿色四边形
- 鼠标滚轮向前/向后移动相机(“缩放”)
当您准备好超越 OpenGL 1.0 时,请查看:
玩得开心...
关于c++ - 如何在 C++ builder 中渲染 openGL 帧?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19941859/