항상 나이스한 청키

#include <GL/glew.h>
#include <GL/glut.h>

void main(int argc, char **argv) 
{
glutInit(&argc, argv);

...

glewInit();
if (GLEW_ARB_vertex_shader && GLEW_ARB_fragment_shader)
printf("Ready for GLSL\n");
else {
printf("Not totally ready :( \n");
exit(1);
}

setShaders();
 glutMainLoop();
}

Posted by chungki

Frustum Culling은 많이 공개되어서 특별한 것은 없지만 단지 Directx와 Opengl에서 구현할 때  행렬문제로 인해 실수가 경우가 많다.  그래서 OpenGL 구현코드를 직접 적는다.

행렬을 아래와 같이 정의한다. t_를 붙인 이유는 보통 행행렬을 많이 사용하지만 OpenGL에서는 열행렬이기 때문에 transpose라는 의미에서 t_라고 붙였다.

struct TMATRIX16

1. {  
2. union  
3. {         
4. struct   {           float t_m11,t_m21,t_m31,t_m41;
5.                      float t_m12,t_m22,t_m32,t_m42;
6.                      float t_m13,t_m23,t_m33,t_m43;
7.                      float t_m14,t_m24,t_m34,t_m44;
8.           };           
9.    float  m_MX[16];    
10.    };
11. };

현재 세팅된 Projection Matrix와 ModelViewMatrix를 가져온다.

TMATRIX16 mxModelView, mxProjView;

::glGetFloatv(GL_MODELVIEW_MATRIX,mxModelView.m_MX);
::glGetFloatv(GL_PROJECTION_MATRIX,mxProjView.m_MX);

TMATRIX16 mxFrustum;
MultiMatrix(mxModelView, mxProjView, mxFrustum);

 typedef struct tagFrustumPlane
{
    union
    {
         struct
         {
              float x;
              float y;
              float z;
              float d;
         };
         float _m[4];
    };
} FRUSTUM_PLANE;

typedef enum emViewPlane
{
    VP_LEFT,
    VP_RIGHT,
    VP_TOP,
    VP_BOTTOM,
    VP_NEAR,
    VP_FAR,
};

 _Plans[VP_LEFT].x=mxFrustum.t_m41+mxFrustum.t_m11;
_Plans[VP_LEFT].y=mxFrustum.t_m42+mxFrustum.t_m12;
_Plans[VP_LEFT].z=mxFrustum.t_m43+mxFrustum.t_m13;
_Plans[VP_LEFT].d=mxFrustum.t_m44+mxFrustum.t_m14;

_Plans[VP_RIGHT].x=mxFrustum.t_m41-mxFrustum.t_m11;
_Plans[VP_RIGHT].y=mxFrustum.t_m42-mxFrustum.t_m12;
_Plans[VP_RIGHT].z=mxFrustum.t_m43-mxFrustum.t_m13;
_Plans[VP_RIGHT].d=mxFrustum.t_m44-mxFrustum.t_m14;

//
_Plans[VP_TOP].x=mxFrustum.t_m41-mxFrustum.t_m21;
_Plans[VP_TOP].y=mxFrustum.t_m42-mxFrustum.t_m22;
_Plans[VP_TOP].z=mxFrustum.t_m43-mxFrustum.t_m23;
_Plans[VP_TOP].d=mxFrustum.t_m44-mxFrustum.t_m24;
_Plans[VP_BOTTOM].x=mxFrustum.t_m41+mxFrustum.t_m21;
_Plans[VP_BOTTOM].y=mxFrustum.t_m42+mxFrustum.t_m22;
_Plans[VP_BOTTOM].z=mxFrustum.t_m43+mxFrustum.t_m23;
_Plans[VP_BOTTOM].d=mxFrustum.t_m44+mxFrustum.t_m24;
_Plans[VP_NEAR].x=mxFrustum.t_m41+mxFrustum.t_m31;
_Plans[VP_NEAR].y=mxFrustum.t_m42+mxFrustum.t_m32;
_Plans[VP_NEAR].z=mxFrustum.t_m43+mxFrustum.t_m33;
_Plans[VP_NEAR].d=mxFrustum.t_m44+mxFrustum.t_m34;
_Plans[VP_FAR].x=mxFrustum.t_m41-mxFrustum.t_m31;
_Plans[VP_FAR].y=mxFrustum.t_m42-mxFrustum.t_m32;
_Plans[VP_FAR].z=mxFrustum.t_m43-mxFrustum.t_m33;
_Plans[VP_FAR].d=mxFrustum.t_m44-mxFrustum.t_m34;

Posted by chungki

Posted by chungki

U3DFont::U3DFont(void)
{

}

U3DFont::~U3DFont(void)
{
for(int i=0;(int)i<strlen(s);i++)
glDeleteLists(lists[i],1);
}


void U3DFont::SetText(char* text)
{
for(int i=0;(int)i<strlen(s);i++)
glDeleteLists(lists[i],1);

HDC hdc=0;
extern HWND hwnd;
hdc=GetDC(hwnd);

if(!hwnd)
hdc=engine.hDC;

strcpy(s,text);

HGDIOBJ hh=SelectObject(hdc ,hfont);

glPushAttrib(GL_LIST_BIT|GL_COLOR_BUFFER_BIT);
// glListBase(1000);

#define FONTLIST 1000
GLYPHMETRICSFLOAT gmf[FONTLIST];

wchar_t dwChar[256];

int nLength = MultiByteToWideChar(936, MB_PRECOMPOSED, s, -1, dwChar, 256);

for(int i=0;i<nLength-1;i++)
{
int nn=glGenLists(1);
lists[i]=nn;
wglUseFontOutlinesW(hdc, dwChar[i], 1, nn, 0.0f, 0.1f, WGL_FONT_POLYGONS, gmf);
}

glPopAttrib(); 

SelectObject(hdc ,(HFONT)hh);
ReleaseDC(hwnd,hdc);

}

void U3DFont:: Draw( )
{
glPushMatrix();
for(int i=0;i<(int)strlen(s);i++)
glCallList(lists[i]); 
glPopMatrix();
}

void U3DFont::Init(char* fontName,float size)
{
const char *p=fontName;
BYTE charset;
if(p[0]==0 )
charset=SYMBOL_CHARSET;
else
charset=GB2312_CHARSET;

LOGFONT lf;

ZeroMemory(&lf, sizeof(lf));
lf.lfHeight = (long)size;//size has no effect
lf.lfEscapement = 0;
lf.lfOrientation = 0;
lf.lfWeight = FW_NORMAL;
lf.lfItalic = 0;
lf.lfUnderline = 1;
lf.lfStrikeOut = 1;
lf.lfCharSet = 
lf.lfOutPrecision = 1;
lf.lfClipPrecision = 0;
lf.lfQuality = 0;
lf.lfPitchAndFamily = 0;

DeleteObject(hfont);
lstrcpy(lf.lfFaceName, fontName);
hfont=CreateFontIndirect(&lf);

}

Posted by chungki

Posted by chungki