ogl_texture_filtering.zip_OPENGL 纹理_opengl_opengl 地形_纹理

//----------------------------------------------------------------------------- // Name: ogl_texture_filtering.cpp // Author: Kevin Harris (kevin@codesampler.com) // Last Modified: 02/01/05 // Description: This sample demonstrates how to filter textures with // OpenGL. // // OpenGL texture filtering is controlled by calling // glTexParameteri() and setting either GL_TEXTURE_MIN_FILTER, // or GL_TEXTURE_MAG_FILTER to one of the following filtering // modes: // // GL_NEAREST // GL_LINEAR // GL_NEAREST_MIPMAP_NEAREST // GL_LINEAR_MIPMAP_NEAREST // GL_NEAREST_MIPMAP_LINEAR // GL_LINEAR_MIPMAP_LINEAR // // Control Keys: F1 - Change Min filter // F2 - Change Mag filter // Left Mouse Button - Spin the view. // Up Arrow - Move the test quad away // Down Arrow - Move the test quad away // ---------------------------------------------------------------------------- // // GL_TEXTURE_MIN_FILTER // // Accepted Values: // // GL_NEAREST // GL_LINEAR // GL_NEAREST_MIPMAP_NEAREST // GL_LINEAR_MIPMAP_NEAREST // GL_NEAREST_MIPMAP_LINEAR // GL_LINEAR_MIPMAP_LINEAR // // Default Value: // // GL_NEAREST_MIPMAP_LINEAR // // ---------------------------------------------------------------------------- // // GL_TEXTURE_MAG_FILTER // // Accepted Values: // // GL_NEAREST // GL_LINEAR // // Default Value: // // GL_LINEAR // //----------------------------------------------------------------------------- #define STRICT #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <mmsystem.h> #include <stdlib.h> #include <stdio.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glaux.h> #include "resource.h" #include "bitmap_fonts.h" //----------------------------------------------------------------------------- // GLOBALS //----------------------------------------------------------------------------- HWND g_hWnd = NULL; HDC g_hDC = NULL; HGLRC g_hRC = NULL; int g_nWindowWidth = 640; int g_nWindowHeight = 480; GLuint g_textureID = -1; float g_fDistance = -4.0f; float g_fSpinX = 0.0f; float g_fSpinY = 0.0f; struct Vertex { float tu, tv; float x, y, z; }; Vertex g_quadVertices[] = { { 0.0f,0.0f, -1.0f,-1.0f, 0.0f }, { 1.0f,0.0f, 1.0f,-1.0f, 0.0f }, { 1.0f,1.0f, 1.0f, 1.0f, 0.0f }, { 0.0f,1.0f, -1.0f, 1.0f, 0.0f } }; enum FilterTypes { FILTER_TYPE_NEAREST = 0, FILTER_TYPE_LINEAR, FILTER_TYPE_NEAREST_MIPMAP_NEAREST, FILTER_TYPE_LINEAR_MIPMAP_NEAREST, FILTER_TYPE_NEAREST_MIPMAP_LINEAR, FILTER_TYPE_LINEAR_MIPMAP_LINEAR }; int g_MinFilterType = FILTER_TYPE_NEAREST; int g_MagFilterType = FILTER_TYPE_NEAREST; bool g_bChangeFilters = true; //----------------------------------------------------------------------------- // PROTOTYPES //----------------------------------------------------------------------------- int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow); LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam); void loadTexture(void); void init(void); void render(void); void shutDown(void); void setMagnificationFilter(void); void setMinificationFilter(void); void setMipMapFilter(void); //----------------------------------------------------------------------------- // Name: WinMain() // Desc: The application's entry point //----------------------------------------------------------------------------- int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) { WNDCLASSEX winClass; MSG uMsg; memset(&uMsg,0,sizeof(uMsg)); winClass.lpszClassName = "MY_WINDOWS_CLASS"; winClass.cbSize = sizeof(WNDCLASSEX); winClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; winClass.lpfnWndProc = WindowProc; winClass.hInstance = hInstance; winClass.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_OPENGL_ICON); winClass.hIconSm = LoadIcon(hInstance, (LPCTSTR)IDI_OPENGL_ICON); winClass.hCursor = LoadCursor(NULL, IDC_ARROW); winClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); winClass.lpszMenuName = NULL; winClass.cbClsExtra = 0; winClass.cbWndExtra = 0; if( !RegisterClassEx(&winClass) ) return E_FAIL; g_hWnd = CreateWindowEx( NULL, "MY_WINDOWS_CLASS", "OpenGL - Texturing Filtering", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0, 0, 640, 480, NULL, NULL, hInstance, NULL ); if( g_hWnd == NULL ) return E_FAIL; ShowWindow( g_hWnd, nCmdShow ); UpdateWindow( g_hWnd ); init(); while( uMsg.message != WM_QUIT ) { if( PeekMessage( &uMsg, NULL, 0, 0, PM_REMOVE ) ) { TranslateMessage( &uMsg ); DispatchMessage( &uMsg ); } else render(); } shutDown(); UnregisterClass( "MY_WINDOWS_CLASS", winClass.hInstance ); return uMsg.wParam; } //----------------------------------------------------------------------------- // Name: WindowProc() // Desc: The window's message handler //----------------------------------------------------------------------------- LRESULT CALLBACK WindowProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { static POINT ptLastMousePosit; static POINT ptCurrentMousePosit; static bool bMousing; switch( msg ) { case WM_KEYDOWN: { switch( wParam ) { case VK_ESCAPE: PostQuitMessage(0); break; case VK_F1: ++g_MinFilterType; if(g_MinFilterType > 5) g_MinFilterType = 0; g_bChangeFilters = true; break; case VK_F2: ++g_MagFilterType; if(g_MagFilterType > 1) g_MagFilterType = 0; g_bChangeFilters = true; break; case 38: // Up Arrow Key g_fDistance -= 0.1f; break; case 40: // Down Arrow Key g_fDistance += 0.1f; break; } } break; case WM_LBUTTONDOWN: { ptLastMousePosit.x = ptCurrentMousePosit.x = LOWORD (lParam); ptLastMousePosit.y = ptCurrentMousePosit.y = HIWORD (lParam); bMousing = true; } break; case WM_LBUTTONUP: { bMousing = false; } break; case WM_MOUSEMOVE: { ptCurrentMousePosit.x = LOWORD (lParam); ptCurrentMousePosit.y = HIWORD (lParam); if( bMousing ) { g_fSpinX -= (ptCurrentMousePosit.x - ptLastMousePosit.x); g_fSpinY -= (ptCurrentMousePosit.y - ptLastMousePosit.y); } ptLastMousePosit.x = ptCurrentMousePosit.x; ptLastMousePosit.y = ptCurrentMousePosit.y; } break; case WM_SIZE: { g_nWindowWidth = LOWORD(lParam); g_nWindowHeight = HIWORD(lParam); glViewport(0, 0, g_nWindowWidth, g_nWindowHeight); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 45.0, (GLdouble)g_nWindowWidth / (GLdouble)g_nWindowHeight, 0.1, 100.0); } break; case WM_CLOSE: { PostQuitMessage(0); } case WM_DESTROY: { PostQuitMessage(0); } break; default: { return DefWindowProc( hWnd, msg, wParam, lParam ); } break; } return 0; } //----------------------------------------------------------------------------- // Name: loadTexture() // Desc: //----------------------------------------------------------------------------- void loadTexture(void) { AUX_RGBImageRec *pTextureImage = auxDIBImageLoad( ".\\test.bmp" ); if( pTextureImage != NULL )