TTEXTURE.C

/* 
 * (c) Copyright 1993, Silicon Graphics, Inc. 
 *               1993-1995 Microsoft Corporation 
 * 
 * ALL RIGHTS RESERVED 
 * 
 * Please refer to OpenGL/readme.txt for additional information 
 * 
 */ 
 
#include "glos.h" 
 
#include <stdio.h> 
#include <string.h> 
#include <math.h> 
#include <stdlib.h> 
#include <gl\glaux.h> 
 
static void BuildCube(void ); 
static void BuildLists(void ); 
static void Init(void ); 
static void CALLBACK Reshape(int width,int height); 
static void CALLBACK Key_LEFT(void ); 
static void CALLBACK Key_RIGHT(void ); 
static void CALLBACK Key_UP(void ); 
static void CALLBACK Key_DOWN(void ); 
static void CALLBACK Key_T(void ); 
static void CALLBACK Key_t(void ); 
static void CALLBACK Key_s(void ); 
static void CALLBACK Key_0(void ); 
static void CALLBACK Key_1(void ); 
static void CALLBACK Key_2(void ); 
static void CALLBACK Key_3(void ); 
static void CALLBACK Key_4(void ); 
static void CALLBACK Key_5(void ); 
static void CALLBACK Key_6(void ); 
static void CALLBACK Key_7(void ); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum doubleBuffer; 
 
char *texFileName = 0; 
AUX_RGBImageRec *image; 
 
float *minFilter, *magFilter, *sWrapMode, *tWrapMode; 
float decal[] = {GL_DECAL}; 
float modulate[] = {GL_MODULATE}; 
float repeat[] = {GL_REPEAT}; 
float clamp[] = {GL_CLAMP}; 
float nr[] = {GL_NEAREST}; 
float ln[] = {GL_LINEAR}; 
float nr_mipmap_nr[] = {GL_NEAREST_MIPMAP_NEAREST}; 
float nr_mipmap_ln[] = {GL_NEAREST_MIPMAP_LINEAR}; 
float ln_mipmap_nr[] = {GL_LINEAR_MIPMAP_NEAREST}; 
float ln_mipmap_ln[] = {GL_LINEAR_MIPMAP_LINEAR}; 
GLint sphereMap[] = {GL_SPHERE_MAP}; 
 
GLenum doSphere = GL_FALSE; 
float xRotation = 0.0, yRotation = 0.0, zTranslate = -3.125; 
 
GLint cube; 
float c[6][4][3] = { 
    { 
    { 
        1.0, 1.0, -1.0 
    }, 
    { 
        -1.0, 1.0, -1.0 
    }, 
    { 
        -1.0, -1.0, -1.0 
    }, 
    { 
        1.0, -1.0, -1.0 
    } 
    }, 
    { 
    { 
        1.0, 1.0, 1.0 
    }, 
    { 
        1.0, 1.0, -1.0 
    }, 
    { 
        1.0, -1.0, -1.0 
    }, 
    { 
        1.0, -1.0, 1.0 
    } 
    }, 
    { 
    { 
        -1.0, 1.0, 1.0 
    }, 
    { 
        1.0, 1.0, 1.0 
    }, 
    { 
        1.0, -1.0, 1.0 
    }, 
    { 
        -1.0, -1.0, 1.0 
    } 
    }, 
    { 
    { 
        -1.0, 1.0, -1.0 
    }, 
    { 
        -1.0, 1.0, 1.0 
    }, 
    { 
        -1.0, -1.0, 1.0 
    }, 
    { 
        -1.0, -1.0, -1.0 
    } 
    }, 
    { 
    { 
        -1.0, 1.0, 1.0 
    }, 
    { 
        -1.0, 1.0, -1.0 
    }, 
    { 
        1.0, 1.0, -1.0 
    }, 
    { 
        1.0, 1.0, 1.0 
    } 
    }, 
    { 
    { 
        -1.0, -1.0, -1.0 
    }, 
    { 
        -1.0, -1.0, 1.0 
    }, 
    { 
        1.0, -1.0, 1.0 
    }, 
    { 
        1.0, -1.0, -1.0 
    } 
    } 
}; 
static float n[6][3] = { 
    { 
    0.0, 0.0, -1.0 
    }, 
    { 
    1.0, 0.0, 0.0 
    }, 
    { 
    0.0, 0.0, 1.0 
    }, 
    { 
    -1.0, 0.0, 0.0 
    }, 
    { 
    0.0, 1.0, 0.0 
    }, 
    { 
    0.0, -1.0, 0.0 
    } 
}; 
static float t[6][4][2] = { 
    { 
    { 
        1.1,  1.1 
    }, 
    { 
        -0.1, 1.1 
    }, 
    { 
        -0.1, -0.1 
    }, 
    { 
        1.1,  -0.1 
    } 
    }, 
    { 
    { 
        1.1,  1.1 
    }, 
    { 
        -0.1, 1.1 
    }, 
    { 
        -0.1, -0.1 
    }, 
    { 
        1.1,  -0.1 
    } 
    }, 
    { 
    { 
        -0.1,  1.1 
    }, 
    { 
        1.1, 1.1 
    }, 
    { 
        1.1, -0.1 
    }, 
    { 
        -0.1,  -0.1 
    } 
    }, 
    { 
    { 
        1.1,  1.1 
    }, 
    { 
        -0.1, 1.1 
    }, 
    { 
        -0.1, -0.1 
    }, 
    { 
        1.1,  -0.1 
    } 
    }, 
    { 
    { 
        1.1,  1.1 
    }, 
    { 
        -0.1, 1.1 
    }, 
    { 
        -0.1, -0.1 
    }, 
    { 
        1.1,  -0.1 
    } 
    }, 
    { 
    { 
        1.1,  1.1 
    }, 
    { 
        -0.1, 1.1 
    }, 
    { 
        -0.1, -0.1 
    }, 
    { 
        1.1,  -0.1 
    } 
    }, 
}; 
 
 
static void BuildCube(void) 
{ 
    GLint i; 
 
    glNewList(cube, GL_COMPILE); 
    for (i = 0; i < 6; i++) { 
    glBegin(GL_POLYGON); 
        glNormal3fv(n[i]); glTexCoord2fv(t[i][0]); glVertex3fv(c[i][0]); 
        glNormal3fv(n[i]); glTexCoord2fv(t[i][1]); glVertex3fv(c[i][1]); 
        glNormal3fv(n[i]); glTexCoord2fv(t[i][2]); glVertex3fv(c[i][2]); 
        glNormal3fv(n[i]); glTexCoord2fv(t[i][3]); glVertex3fv(c[i][3]); 
    glEnd(); 
    } 
    glEndList(); 
} 
 
static void BuildLists(void) 
{ 
 
    cube = glGenLists(1); 
    BuildCube(); 
} 
 
static void Init(void) 
{ 
 
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 
    gluBuild2DMipmaps(GL_TEXTURE_2D, 3, image->sizeX, image->sizeY, 
              GL_RGB, GL_UNSIGNED_BYTE, image->data); 
    glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal); 
    glEnable(GL_TEXTURE_2D); 
 
    glFrontFace(GL_CCW); 
    glCullFace(GL_FRONT); 
    glEnable(GL_CULL_FACE); 
 
    BuildLists(); 
 
    glClearColor(0.0, 0.0, 0.0, 0.0); 
 
    magFilter = nr; 
    minFilter = nr; 
    sWrapMode = repeat; 
    tWrapMode = repeat; 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    glViewport(0, 0, (GLint)width, (GLint)height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    gluPerspective(145.0, 1.0, 0.01, 1000); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_LEFT(void) 
{ 
    yRotation -= 0.5; 
} 
 
static void CALLBACK Key_RIGHT(void) 
{ 
    yRotation += 0.5; 
} 
 
static void CALLBACK Key_UP(void) 
{ 
    xRotation -= 0.5; 
} 
 
static void CALLBACK Key_DOWN(void) 
{ 
    xRotation += 0.5; 
} 
 
static void CALLBACK Key_T(void) 
{ 
    zTranslate += 0.25; 
} 
 
static void CALLBACK Key_t(void) 
{ 
    zTranslate -= 0.25; 
} 
 
static void CALLBACK Key_s(void) 
{ 
    doSphere = !doSphere; 
    if (doSphere) { 
        glTexGeniv(GL_S, GL_TEXTURE_GEN_MODE, sphereMap); 
        glTexGeniv(GL_T, GL_TEXTURE_GEN_MODE, sphereMap); 
        glEnable(GL_TEXTURE_GEN_S); 
        glEnable(GL_TEXTURE_GEN_T); 
    } else { 
        glDisable(GL_TEXTURE_GEN_S); 
        glDisable(GL_TEXTURE_GEN_T); 
    } 
} 
 
static void CALLBACK Key_0(void) 
{ 
    magFilter = nr; 
} 
 
static void CALLBACK Key_1(void) 
{ 
    magFilter = ln; 
} 
 
static void CALLBACK Key_2(void) 
{ 
    minFilter = nr; 
} 
 
static void CALLBACK Key_3(void) 
{ 
    minFilter = ln; 
} 
 
static void CALLBACK Key_4(void) 
{ 
    minFilter = nr_mipmap_nr; 
} 
 
static void CALLBACK Key_5(void) 
{ 
    minFilter = nr_mipmap_ln; 
} 
 
static void CALLBACK Key_6(void) 
{ 
    minFilter = ln_mipmap_nr; 
} 
 
static void CALLBACK Key_7(void) 
{ 
    minFilter = ln_mipmap_ln; 
} 
 
static void CALLBACK Draw(void) 
{ 
 
    glClear(GL_COLOR_BUFFER_BIT); 
 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, sWrapMode); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, tWrapMode); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter); 
 
    glPushMatrix(); 
 
    glTranslatef(0.0, 0.0, zTranslate); 
    glRotatef(xRotation, 1, 0, 0); 
    glRotatef(yRotation, 0, 1, 0); 
    glCallList(cube); 
 
    glPopMatrix(); 
 
    glFlush(); 
 
    if (doubleBuffer) { 
    auxSwapBuffers(); 
    } 
} 
 
static GLenum Args(int argc, char **argv) 
{ 
    GLint i; 
 
    doubleBuffer = GL_FALSE; 
 
 
    for (i = 1; i < argc; i++) { 
    if (strcmp(argv[i], "-sb") == 0) { 
        doubleBuffer = GL_FALSE; 
    } else if (strcmp(argv[i], "-db") == 0) { 
        doubleBuffer = GL_TRUE; 
    } else if (strcmp(argv[i], "-f") == 0) { 
        if (i+1 >= argc || argv[i+1][0] == '-') { 
        //printf("-f (No file name).\n"); 
        return GL_FALSE; 
        } else { 
        texFileName = argv[++i]; 
        } 
    } else { 
        //printf("%s (Bad option).\n", argv[i]); 
        return GL_FALSE; 
    } 
    } 
    return GL_TRUE; 
} 
 
void main(int argc, char **argv) 
{ 
    GLenum type; 
 
    if (Args(argc, argv) == GL_FALSE) { 
    auxQuit(); 
    } 
 
    if (texFileName == 0) { 
    //printf("No image file.\n"); 
    auxQuit(); 
    } 
 
    image = auxRGBImageLoad(texFileName); 
 
    auxInitPosition(0, 0, 300, 300); 
 
    type = AUX_RGB; 
    type |= (doubleBuffer) ? AUX_DOUBLE : AUX_SINGLE; 
 
    auxInitDisplayMode(type); 
 
    if (auxInitWindow("Texture Test") == GL_FALSE) { 
    auxQuit(); 
    } 
 
    Init(); 
 
    auxExposeFunc((AUXEXPOSEPROC)Reshape); 
    auxReshapeFunc((AUXRESHAPEPROC)Reshape); 
    auxKeyFunc(AUX_LEFT, Key_LEFT); 
    auxKeyFunc(AUX_RIGHT, Key_RIGHT); 
    auxKeyFunc(AUX_UP, Key_UP); 
    auxKeyFunc(AUX_DOWN, Key_DOWN); 
    auxKeyFunc(AUX_T, Key_T); 
    auxKeyFunc(AUX_t, Key_t); 
    auxKeyFunc(AUX_s, Key_s); 
    auxKeyFunc(AUX_0, Key_0); 
    auxKeyFunc(AUX_1, Key_1); 
    auxKeyFunc(AUX_2, Key_2); 
    auxKeyFunc(AUX_3, Key_3); 
    auxKeyFunc(AUX_4, Key_4); 
    auxKeyFunc(AUX_5, Key_5); 
    auxKeyFunc(AUX_6, Key_6); 
    auxKeyFunc(AUX_7, Key_7); 
    auxMainLoop(Draw); 
}