我有一个充满山脉和水的风景。我想在风景中添加太阳。但是太阳没有出现在风景中。下面是我的代码。请帮我这样做..
// Include files
#include <stdio.h>
#include <windows.h>
#include <gl\gl.h>
#include "gl/Glu.h"
#include "Gl/glut.h"
#include<math.h>
#include<conio.h>
#include "resources.h"
#include "fovdemo.h"
// Global variables
HINSTANCE hInstance;
HWND hWnd;
HDC hDC;
HGLRC hRC;
float cam_x, cam_y, cam_z;
float cam_yaw, cam_pitch;
float hfov, aspect;
int fovmode;
bool active;
static int useRGB = 1;
static int useLighting = 1;
static int useFog = 0;
static int useDB = 1;
static int useLogo = 0;
static int useQuads = 1;
static int tick = -1;
static int moving = 1;
#define GREY 0
#define RED 1
#define GREEN 2
#define BLUE 3
#define CYAN 4
#define MAGENTA 5
#define YELLOW 6
#define BLACK 7
static float lightPos[4] =
{2.0, 4.0, 2.0, 1.0};
static float lightAmb[4] ={0.2, 0.2, 0.2, 1.0};
static float lightDiff[4] ={0.8, 0.8, 0.8, 1.0};
static float lightSpec[4] ={0.4, 0.4, 0.4, 1.0};
static float fogColor[4] ={0.0, 0.0, 0.0, 0.0};
static float fogIndex[1] ={0.0};
static unsigned char shadowPattern[128] =
{
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, /* 50% Grey */
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55
};
// Function prototypes
LRESULT CALLBACK MainWndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
BOOL CALLBACK DummyProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM) { return false; }
float GetTime ()
{
return (float)GetTickCount() / 1000.0f;
}
/////////////////////////////////////////////////////////////////////////////////////////////
// WINMAIN FUNCTION
/////////////////////////////////////////////////////////////////////////////////////////////
int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
MSG msg;
WNDCLASSEX wc;
// Copy instance handle into global variable
hInstance = hThisInstance;
// Check for previous instance
if (hPrevInstance)
{
MessageBox(NULL, "Sorry, you can only start one instance of this program at a time.", "Can't Start Program", MB_OK);
return 0;
}
// Register window class
wc.cbSize = sizeof(WNDCLASSEX);
wc.lpszClassName = "FovDemoClass";
wc.lpfnWndProc = MainWndProc;
wc.hInstance = hInstance;
wc.hbrBackground = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hIcon = wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
wc.style = CS_VREDRAW | CS_HREDRAW;
wc.lpszMenuName = NULL;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
if (!RegisterClassEx(&wc)) return 0;
// Create main window
hWnd = CreateWindow("FovDemoClass", "Fov Demo", WS_POPUP, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), NULL, NULL, hInstance, NULL);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
//Sun Code
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glTranslatef(200, 300, 0.0f);
static const int circle_points = 100;
static const float angle = 2.0f * 3.1416f / circle_points;
// this code (mostly) copied from question:
glBegin(GL_POLYGON);
double angle1=0.0;
glVertex2d(50 * cos(0.0) , 50 * sin(0.0));
int i;
for (i=0; i<circle_points; i++)
{
glVertex2d(50 * cos(angle1), 50 *sin(angle1));
angle1 += angle;
}
glEnd();
glPopMatrix();
// Main message loop
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
/////////////////////////////////////////////////////////////////////////////////////////////
// MAINWNDPROC FUNCTION
/////////////////////////////////////////////////////////////////////////////////////////////
LRESULT CALLBACK MainWndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static POINT mousepos;
static float last_frame_time;
switch (message)
{
case WM_CREATE:
{
HWND hWndLoading;
PIXELFORMATDESCRIPTOR pfd;
int nBestMatch;
// Show loading dialog box
SetCursor(LoadCursor(NULL, IDC_WAIT));
hWndLoading = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_LOADING), hWnd, DummyProc);
ShowWindow(hWndLoading, SW_SHOWNORMAL);
UpdateWindow(hWndLoading);
// Get window DC
hDC = GetDC(hWnd);
// Set up the OpenGL pixel format for this window
memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR));
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 32;
pfd.cDepthBits = 32;
nBestMatch = ChoosePixelFormat(hDC, &pfd);
SetPixelFormat(hDC, nBestMatch, &pfd);
// Set up OpenGL
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
OpenGL_Init();
// Get rid of loading dialog
SetCursor(LoadCursor(NULL, IDC_ARROW));
DestroyWindow(hWndLoading);
last_frame_time = GetTime();
active = true;
fovmode = FF_NORMAL;
aspect = (float)GetSystemMetrics(SM_CXSCREEN) / GetSystemMetrics(SM_CYSCREEN);
hfov = 90.0f;
return 0;
}
case WM_ACTIVATE:
{
if (LOWORD(wParam) == WA_INACTIVE)
{
active = false;
ShowWindow(hWnd, SW_MINIMIZE); // Minimize when alt-tabbed away, since it's a fullscreen window
}
else
{
active = true;
last_frame_time = GetTime();
InvalidateRect(hWnd, NULL, false);
}
return 0;
}
case WM_PAINT:
{
if (active)
{
// Calculate time it took to draw last frame
float current_time = GetTime();
float frametime = current_time - last_frame_time;
last_frame_time = current_time;
// Handle input, logic, whatnot
OpenGL_Logic(frametime);
// Render the scene
OpenGL_SetupView(fovmode);
OpenGL_Render();
// Flush and flip
glFlush();
SwapBuffers(hDC);
}
else
{
// If inactive, just rerender when we need to
OpenGL_SetupView(fovmode);
OpenGL_Render();
glFlush();
SwapBuffers(hDC);
ValidateRect(hWnd, NULL);
}
return 0;
}
case WM_CHAR:
{
// Respond to keypresses
switch (wParam)
{
// 'F' switches between preset fov modes
case 'f':
case 'F':
{
++fovmode;
if (fovmode == NUM_FOVMODES) fovmode = 0;
switch (fovmode)
{
case FF_NORMAL: // Normal fov, full frame viewport
{
aspect = (float)GetSystemMetrics(SM_CXSCREEN) / GetSystemMetrics(SM_CYSCREEN);
hfov = 90.0f;
break;
}
case WS_WIDE: // Wide fov with a widescreen viewport (aspect ratio of 2.35, same as theatre)
{
aspect = 2.35f;
hfov = 140.0f;
break;
}
case FF_WIDE: // Wide fov with a full-frame viewport
{
aspect = (float)GetSystemMetrics(SM_CXSCREEN) / GetSystemMetrics(SM_CYSCREEN);
hfov = 140.0f;
break;
}
case 'd':
{
if (useLighting)
{
glEnable(GL_LIGHTING);
}
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
glLightfv(GL_LIGHT0, GL_AMBIENT, lightAmb);
glLightfv(GL_LIGHT0, GL_DIFFUSE, lightDiff);
glLightfv(GL_LIGHT0, GL_SPECULAR, lightSpec);
glEnable(GL_NORMALIZE);
if (useFog){
glEnable(GL_FOG);
}
glFogfv(GL_FOG_COLOR, fogColor);
glFogfv(GL_FOG_INDEX, fogIndex);
glFogf(GL_FOG_MODE, GL_EXP);
glFogf(GL_FOG_DENSITY, 0.5);
glFogf(GL_FOG_START, 1.0);
glFogf(GL_FOG_END, 3.0);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glShadeModel(GL_SMOOTH);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
if (useLogo) {
}
else {
glPolygonStipple((const GLubyte *) shadowPattern);
}
glClearColor(0.0, 0.0, 0.0, 1);
glClearIndex(0);
glClearDepth(1);
}
break;
}
// Escape key exits
case 27:
{
DestroyWindow(hWnd);
break;
}
}
// Make sure window is redrawn
InvalidateRect(hWnd, NULL, false);
return 0;
}
case WM_LBUTTONDOWN:
{
if (active)
{
// Capture mouse and hide cursor
SetCapture(hWnd);
ShowCursor(false);
// Save off mouse position
GetCursorPos(&mousepos);
}
return 0;
}
case WM_MOUSEMOVE:
{
// Move view angles if dragging left button
if (active && (wParam & MK_LBUTTON))
{
POINT pt;
int deltax, deltay;
bool wrap = false;
// Get current mouse position
GetCursorPos(&pt);
// Calculate deltas
deltax = pt.x - mousepos.x;
deltay = pt.y - mousepos.y;
// Wrap mouse position if needed
if (pt.x == GetSystemMetrics(SM_CXSCREEN) - 1)
pt.x = 0, wrap = true;
else if (pt.x == 0)
pt.x = GetSystemMetrics(SM_CXSCREEN) - 1, wrap = true;
if (pt.y == GetSystemMetrics(SM_CYSCREEN) - 1)
pt.y = 0, wrap = true;
else if (pt.y == 0)
pt.y = GetSystemMetrics(SM_CYSCREEN) - 1, wrap = true;
if (wrap)
SetCursorPos(pt.x, pt.y);
// Save off new mouse position
mousepos = pt;
// Change view angles accordingly
cam_yaw -= (float)deltax * MOUSE_CAMERA_ANGLE_FACTOR;
cam_pitch -= (float)deltay * MOUSE_CAMERA_ANGLE_FACTOR;
// Wrap yaw and clamp pitch
if (cam_yaw > 360.0f) cam_yaw -= 360.0f;
if (cam_yaw < 0.0f) cam_yaw += 0.0f;
if (cam_pitch > 90.0f) cam_pitch = 90.0f;
if (cam_pitch < -90.0f) cam_pitch = -90.0f;
InvalidateRect(hWnd, NULL, false);
}
return 0;
}
case WM_LBUTTONUP:
{
if (active)
{
// Release mouse capture and show cursor
ReleaseCapture();
ShowCursor(true);
}
return 0;
}
case WM_DESTROY:
{
// Shut down OpenGL
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(hWnd, hDC);
PostQuitMessage(0);
return 0;
}
default:
{
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
}
}
答案 0 :(得分：3)
OpenGL不是场景图，它是一个绘图API。您没有“添加”对象，您在绘图例程中绘制它们。您刚刚在WinMain中调用了一堆不属于他们的OpenGL绘图函数。即使那些有一些影响（他们可能没有），你只会很快看到他们的结果，即直到下一个窗口重绘。
在WM_PAINT消息的消息处理程序中，调用了一些OpenGL_*函数。你必须把你的太阳绘图代码放在其中一个。