---

general.cpp File Reference

#include "general.h"

Go to the source code of this file.

Functions
bool	LoadTGA (TEXTURE *texture, char *filename)
void	SetGLProperties ()
void	SetGLView (int Width, int Height)
void	SetGLMaterial ()

---

Function Documentation

bool LoadTGA (  TEXTURE *    texture, char *    filename )

Definition at line 3 of file general.cpp. References TEXTURE::Bpp, TEXTURE::Height, TEXTURE::ImageData, texture, and TEXTURE::Width. { GLubyte TGAheader[12]={0,0,2,0,0,0,0,0,0,0,0,0}; // Uncompressed TGA Header GLubyte TGAcompare[12]; // Used To Compare TGA Header GLubyte header[6]; // First 6 Useful Bytes From The Header GLuint bytesPerPixel; // Holds Number Of Bytes Per Pixel Used In The TGA File GLuint imageSize; // Used To Store The Image Size When Setting Aside Ram GLuint temp; // Temporary Variable GLuint type=GL_RGBA; // Set The Default GL Mode To RBGA (32 BPP) FILE *file = fopen(filename, "rb"); // Open The TGA Fi if( file==NULL || // Does File Even Exist? fread(TGAcompare,1,sizeof(TGAcompare),file)!=sizeof(TGAcompare) || // Are There 12 Bytes To Read? memcmp(TGAheader,TGAcompare,sizeof(TGAheader))!=0 || // Does The Header Match What We Want? fread(header,1,sizeof(header),file)!=sizeof(header)) // If So Read Next 6 Header Bytes { if (file == NULL) // Did The File Even Exist? *Added Jim Strong* { MessageBox(NULL,"Image file was not found","Error",MB_OK|MB_ICONERROR); return false; // Return False } if(TGAcompare[2] == 1) MessageBox(NULL,"Image cannot be indexed color. \r\n Convert the image to RGB or RGBA.","Error",MB_OK|MB_ICONERROR); if(TGAcompare[2] == 3) MessageBox(NULL,"Image cannot be greyscale color. \r\n Convert the image to RGB or RGBA.","Error",MB_OK|MB_ICONERROR); if(TGAcompare[2] == 9 || TGAcompare[2] == 10) MessageBox(NULL,"Image cannot be compressed. \r\n Convert the image to an uncompressed format.","Error",MB_OK|MB_ICONERROR); fclose(file); // If Anything Failed, Close The File return false; // Return False } texture->Width = header[1] * 256 + header[0]; // Determine The TGA Width (highbyte*256+lowbyte) texture->Height = header[3] * 256 + header[2]; // Determine The TGA Height (highbyte*256+lowbyte) if( texture->Width <=0 || // Is The Width Less Than Or Equal To Zero texture->Height <=0 || // Is The Height Less Than Or Equal To Zero (header[4]!=24 && header[4]!=32)) // Is The TGA 24 or 32 Bit? { fclose(file); // If Anything Failed, Close The File if(texture->Width <=0 || texture->Height <=0) MessageBox(NULL,"Image must have a width and height greater than 0","Error",MB_OK|MB_ICONERROR); if(header[4]!=24 && header[4]!=32) MessageBox(NULL,"Image must be 24 or 32 bit","Error",MB_OK|MB_ICONERROR); return false; // Return False } texture->Bpp = header[4]; // Grab The TGA's Bits Per Pixel (24 or 32) bytesPerPixel = texture->Bpp/8; // Divide By 8 To Get The Bytes Per Pixel imageSize = texture->Width*texture->Height*bytesPerPixel; // Calculate The Memory Required For The TGA Data texture->ImageData=(GLubyte *)malloc(imageSize); // Reserve Memory To Hold The TGA Data if( texture->ImageData==NULL || // Does The Storage Memory Exist? fread(texture->ImageData, 1, imageSize, file)!=imageSize) // Does The Image Size Match The Memory Reserved? { if(texture->ImageData!=NULL) // Was Image Data Loaded free(texture->ImageData); // If So, Release The Image Data MessageBox(NULL,"Image load failed for unknown reason.","Error",MB_OK|MB_ICONERROR); fclose(file); // Close The File return false; // Return False } for(GLuint i=0; i<int(imageSize); i+=bytesPerPixel) // Loop Through The Image Data { // Swaps The 1st And 3rd Bytes ('R'ed and 'B'lue) temp=texture->ImageData[i]; // Temporarily Store The Value At Image Data 'i' texture->ImageData[i] = texture->ImageData[i + 2]; // Set The 1st Byte To The Value Of The 3rd Byte texture->ImageData[i + 2] = temp; // Set The 3rd Byte To The Value In 'temp' (1st Byte Value) } fclose (file); // Close The File // Build A Texture From The Data glGenTextures(1, &texture[0].TexID); // Generate OpenGL texture IDs glBindTexture(GL_TEXTURE_2D, texture[0].TexID); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); if (texture[0].Bpp==24) // Was The TGA 24 Bits { type=GL_RGB; // If So Set The 'type' To GL_RGB } glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glTexImage2D(GL_TEXTURE_2D, 0, type, texture[0].Width, texture[0].Height, 0, type, GL_UNSIGNED_BYTE, texture[0].ImageData); gluBuild2DMipmaps(GL_TEXTURE_2D, type, texture[0].Width, texture[0].Height, type, GL_UNSIGNED_BYTE, texture[0].ImageData); free(texture->ImageData); return true; // Texture Building Went Ok, Return True }

void SetGLMaterial (    )

Definition at line 108 of file general.cpp. { float no_mat[] = { 0.0, 0.0, 0.0, 1.0 }; float mat_ambient[] = { 0.4, 0.4, 0.4, 1.0 }; float mat_diffuse[] = { 0.8, 0.8, 0.8, 1.0 }; float mat_specular[] = { 0.9, 0.9, 0.9, 1.0 }; float high_shininess[] = { 80.0 }; glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); glMaterialfv(GL_FRONT, GL_EMISSION, no_mat); glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess); }

void SetGLProperties (    )

Definition at line 83 of file general.cpp. { glCullFace(GL_BACK); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black glClearDepth(1.0); // Enables Clearing Of The Depth Buffer glDepthFunc(GL_LESS); // The Type Of Depth Test To Do glEnable(GL_DEPTH_TEST); // Enables Depth Testing glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading glEnable(GL_NORMALIZE); glEnable(GL_CULL_FACE); }

void SetGLView (  int    Width, int    Height )

Definition at line 95 of file general.cpp. { if (Height==0) // Prevent A Divide By Zero If The Window Is Too Small Height=1; glViewport(0, 0, Width, Height); // Reset The Current Viewport And Perspective Transformation glMatrixMode(GL_PROJECTION); // Select The Projection Matrix glLoadIdentity(); // Reset The Projection Matrix gluPerspective(45.0,(float)Width/(float)Height,0.1,200.0); // Calculate The Aspect Ratio Of The Window glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix glLoadIdentity(); }

---