TEVAL.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 <stdlib.h> 
#include <math.h> 
#include <gl\glaux.h> 
 
 
#define VORDER 10 
#define CORDER 10 
#define TORDER 3 
 
#define VMAJOR_ORDER 2 
#define VMINOR_ORDER 3 
 
#define CMAJOR_ORDER 2 
#define CMINOR_ORDER 2 
 
#define TMAJOR_ORDER 2 
#define TMINOR_ORDER 2 
 
#define VDIM 4 
#define CDIM 4 
#define TDIM 2 
 
#define ONE_D 1 
#define TWO_D 2 
 
#define EVAL 3 
#define MESH 4 
 
static void Init(void ); 
static void DrawPoints1(void ); 
static void DrawPoints2(void ); 
static void DrawMapEval1(float du); 
static void DrawMapEval2(float du,float dv); 
static void RenderEval(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_1(void ); 
static void CALLBACK Key_2(void ); 
static void CALLBACK Key_e(void ); 
static void CALLBACK Key_m(void ); 
static void CALLBACK Key_f(void ); 
static void CALLBACK Key_p(void ); 
static void CALLBACK Key_c(void ); 
static void CALLBACK Key_t(void ); 
static void CALLBACK Key_l(void ); 
static void CALLBACK Draw(void ); 
static GLenum Args(int argc,char **argv ); 
 
GLenum doubleBuffer; 
 
float rotX = 0.0, rotY = 0.0, translateZ = -1.0; 
 
GLenum arrayType = ONE_D; 
GLenum colorType = GL_FALSE; 
GLenum textureType = GL_FALSE; 
GLenum polygonFilled = GL_FALSE; 
GLenum lighting = GL_FALSE; 
GLenum mapPoint = GL_FALSE; 
GLenum mapType = EVAL; 
 
double point1[10*4] = { 
    -0.5, 0.0, 0.0, 1.0, 
    -0.4, 0.5, 0.0, 1.0, 
    -0.3,-0.5, 0.0, 1.0, 
    -0.2, 0.5, 0.0, 1.0, 
    -0.1,-0.5, 0.0, 1.0, 
    0.0, 0.5, 0.0, 1.0, 
    0.1,-0.5, 0.0, 1.0, 
    0.2, 0.5, 0.0, 1.0, 
    0.3,-0.5, 0.0, 1.0, 
    0.4, 0.0, 0.0, 1.0, 
}; 
double cpoint1[10*4] = { 
    0.0, 0.0, 1.0, 1.0, 
    0.3, 0.0, 0.7, 1.0, 
    0.6, 0.0, 0.3, 1.0, 
    1.0, 0.0, 0.0, 1.0, 
    1.0, 0.3, 0.0, 1.0, 
    1.0, 0.6, 0.0, 1.0, 
    1.0, 1.0, 0.0, 1.0, 
    1.0, 1.0, 0.5, 1.0, 
    1.0, 1.0, 1.0, 1.0, 
}; 
double tpoint1[11*4] = { 
    0.0, 0.0, 0.0, 1.0, 
    0.0, 0.1, 0.0, 1.0, 
    0.0, 0.2, 0.0, 1.0, 
    0.0, 0.3, 0.0, 1.0, 
    0.0, 0.4, 0.0, 1.0, 
    0.0, 0.5, 0.0, 1.0, 
    0.0, 0.6, 0.0, 1.0, 
    0.0, 0.7, 0.0, 1.0, 
    0.0, 0.8, 0.0, 1.0, 
    0.0, 0.9, 0.0, 1.0, 
}; 
double point2[2*3*4] = { 
    -0.5, -0.5,  0.5, 1.0,  
     0.0,  1.0,  0.5, 1.0,  
     0.5, -0.5,  0.5, 1.0, 
    -0.5,  0.5, -0.5, 1.0,  
     0.0, -1.0, -0.5, 1.0,  
     0.5,  0.5, -0.5, 1.0, 
}; 
double cpoint2[2*2*4] = { 
    0.0, 0.0, 0.0, 1.0, 
    0.0, 0.0, 1.0, 1.0, 
    0.0, 1.0, 0.0, 1.0, 
    1.0, 1.0, 1.0, 1.0, 
}; 
double tpoint2[2*2*2] = { 
    0.0, 0.0, 0.0, 1.0, 
    1.0, 0.0, 1.0, 1.0,  
}; 
float textureImage[4*2*4] =  { 
    1.0, 1.0, 1.0, 1.0, 
    1.0, 0.0, 0.0, 1.0, 
    1.0, 0.0, 0.0, 1.0, 
    1.0, 1.0, 1.0, 1.0,  
    1.0, 1.0, 1.0, 1.0, 
    1.0, 0.0, 0.0, 1.0, 
    1.0, 0.0, 0.0, 1.0, 
    1.0, 1.0, 1.0, 1.0,  
}; 
 
 
static void Init(void) 
{ 
    static float ambient[] = {0.1, 0.1, 0.1, 1.0}; 
    static float diffuse[] = {1.0, 1.0, 1.0, 1.0}; 
    static float position[] = {0.0, 0.0, -150.0, 0.0}; 
    static float front_mat_shininess[] = {30.0}; 
    static float front_mat_specular[] = {0.7, 0.7, 0.7, 1.0}; 
    static float front_mat_diffuse[] = {1.0, 0.2, 1.0, 1.0}; 
    static float back_mat_shininess[] = {50.0}; 
    static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0}; 
    static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0}; 
    static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0}; 
    static float lmodel_twoside[] = {GL_TRUE}; 
    static float decal[] = {GL_DECAL}; 
    static float modulate[] = {GL_MODULATE}; 
    static float repeat[] = {GL_REPEAT}; 
    static float clamp[] = {GL_CLAMP}; 
    static float nr[] = {GL_NEAREST}; 
    static float ln[] = {GL_LINEAR}; 
 
    glFrontFace(GL_CCW); 
 
    glEnable(GL_DEPTH_TEST); 
    glDepthFunc(GL_LEQUAL); 
 
    glMap1d(GL_MAP1_VERTEX_4, 0.0, 1.0, VDIM, VORDER, point1); 
    glMap1d(GL_MAP1_COLOR_4, 0.0, 1.0, CDIM, CORDER, cpoint1); 
 
    glMap2d(GL_MAP2_VERTEX_4, 0.0, 1.0, VMINOR_ORDER*VDIM, VMAJOR_ORDER, 0.0, 
        1.0, VDIM, VMINOR_ORDER, point2); 
    glMap2d(GL_MAP2_COLOR_4, 0.0, 1.0, CMINOR_ORDER*CDIM, CMAJOR_ORDER, 0.0, 
        1.0, CDIM, CMINOR_ORDER, cpoint2); 
    glMap2d(GL_MAP2_TEXTURE_COORD_2, 0.0, 1.0, TMINOR_ORDER*TDIM, 
        TMAJOR_ORDER, 0.0, 1.0, TDIM, TMINOR_ORDER, tpoint2); 
 
    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient); 
    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse); 
    glLightfv(GL_LIGHT0, GL_POSITION, position); 
     
    glMaterialfv(GL_FRONT, GL_DIFFUSE, front_mat_diffuse); 
    glMaterialfv(GL_BACK, GL_DIFFUSE, back_mat_diffuse); 
 
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); 
    glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside); 
 
    glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, decal); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, repeat); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, repeat); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, nr); 
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, nr); 
    glTexImage2D(GL_TEXTURE_2D, 0, 4, 2, 4, 0, GL_RGBA, GL_FLOAT, 
         (GLvoid *)textureImage); 
} 
 
static void DrawPoints1(void) 
{ 
    GLint i; 
 
    glColor3f(0.0, 1.0, 0.0); 
    glPointSize(2); 
    glBegin(GL_POINTS); 
    for (i = 0; i < VORDER; i++) { 
        glVertex4dv(&point1[i*4]); 
    } 
    glEnd(); 
} 
 
static void DrawPoints2(void) 
{ 
    GLint i, j; 
 
    glColor3f(1.0, 0.0, 1.0); 
    glPointSize(2); 
    glBegin(GL_POINTS); 
    for (i = 0; i < VMAJOR_ORDER; i++) { 
        for (j = 0; j < VMINOR_ORDER; j++) { 
        glVertex4dv(&point2[i*4*VMINOR_ORDER+j*4]); 
        } 
    } 
    glEnd(); 
} 
 
static void DrawMapEval1(float du) 
{ 
    float u; 
 
    glColor3f(1.0, 0.0, 0.0); 
    glBegin(GL_LINE_STRIP); 
    for (u = 0.0; u < 1.0; u += du) { 
        glEvalCoord1d(u); 
    } 
    glEvalCoord1d(1.0); 
    glEnd(); 
} 
 
static void DrawMapEval2(float du, float dv) 
{ 
    float u, v, tmp; 
 
    glColor3f(1.0, 0.0, 0.0); 
    for (v = 0.0; v < 1.0; v += dv) { 
    glBegin(GL_QUAD_STRIP); 
        for (u = 0.0; u <= 1.0; u += du) { 
        glEvalCoord2d(u,v); 
        tmp = (v + dv < 1.0) ? (v + dv) : 1.0; 
        glEvalCoord2d(u, tmp); 
        } 
        glEvalCoord2d(1.0, v); 
        glEvalCoord2d(1.0, v+dv); 
    glEnd(); 
    } 
} 
 
static void RenderEval(void) 
{ 
 
    if (colorType) { 
    glEnable(GL_MAP1_COLOR_4); 
    glEnable(GL_MAP2_COLOR_4); 
    } else { 
    glDisable(GL_MAP1_COLOR_4); 
    glDisable(GL_MAP2_COLOR_4); 
    } 
 
    if (textureType) { 
    glEnable(GL_TEXTURE_2D); 
    glEnable(GL_MAP2_TEXTURE_COORD_2); 
    } else { 
    glDisable(GL_TEXTURE_2D); 
    glDisable(GL_MAP2_TEXTURE_COORD_2); 
    } 
 
    if (polygonFilled) { 
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); 
    } else { 
    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
    } 
 
    glShadeModel(GL_SMOOTH); 
 
    switch (mapType) { 
      case EVAL: 
    switch (arrayType) { 
      case ONE_D: 
        glDisable(GL_MAP2_VERTEX_4); 
        glEnable(GL_MAP1_VERTEX_4); 
        DrawPoints1(); 
        DrawMapEval1(0.1/VORDER); 
        break; 
      case TWO_D: 
        glDisable(GL_MAP1_VERTEX_4); 
        glEnable(GL_MAP2_VERTEX_4); 
        DrawPoints2(); 
        DrawMapEval2(0.1/VMAJOR_ORDER,0.1/VMINOR_ORDER); 
        break; 
    } 
    break; 
      case MESH: 
    switch (arrayType) { 
      case ONE_D: 
        DrawPoints1(); 
        glDisable(GL_MAP2_VERTEX_4); 
        glEnable (GL_MAP1_VERTEX_4); 
        glColor3f(0.0, 0.0, 1.0); 
        glMapGrid1d(40, 0.0, 1.0); 
        if (mapPoint) { 
        glPointSize(2); 
        glEvalMesh1(GL_POINT, 0, 40); 
        } else { 
        glEvalMesh1(GL_LINE, 0, 40); 
        } 
        break; 
      case TWO_D: 
        DrawPoints2(); 
        glDisable(GL_MAP1_VERTEX_4); 
        glEnable(GL_MAP2_VERTEX_4); 
        glColor3f(0.0, 0.0, 1.0); 
        glMapGrid2d(20, 0.0, 1.0, 20, 0.0, 1.0); 
        if (mapPoint) { 
        glPointSize(2); 
        glEvalMesh2(GL_POINT, 0, 20, 0, 20); 
        } else if (polygonFilled) { 
        glEvalMesh2(GL_FILL, 0, 20, 0, 20); 
        } else { 
        glEvalMesh2(GL_LINE, 0, 20, 0, 20); 
        } 
        break; 
    } 
    break; 
    } 
} 
 
static void CALLBACK Reshape(int width, int height) 
{ 
 
    glViewport(0, 0, (GLint)width, (GLint)height); 
 
    glMatrixMode(GL_PROJECTION); 
    glLoadIdentity(); 
    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 10.0); 
    glMatrixMode(GL_MODELVIEW); 
} 
 
static void CALLBACK Key_left(void) 
{ 
    rotY -= 30; 
} 
 
static void CALLBACK Key_right(void) 
{ 
    rotY += 30; 
} 
 
static void CALLBACK Key_up(void) 
{ 
    rotX -= 30; 
} 
 
static void CALLBACK Key_down(void) 
{ 
    rotX += 30; 
} 
 
static void CALLBACK Key_1(void) 
{ 
    arrayType = ONE_D; 
} 
 
static void CALLBACK Key_2(void) 
{ 
    arrayType = TWO_D; 
} 
 
static void CALLBACK Key_e(void) 
{ 
    mapType = EVAL; 
} 
 
static void CALLBACK Key_m(void) 
{ 
    mapType = MESH; 
} 
 
static void CALLBACK Key_f(void) 
{ 
    polygonFilled = !polygonFilled; 
} 
 
static void CALLBACK Key_p(void) 
{ 
    mapPoint = !mapPoint; 
} 
 
static void CALLBACK Key_c(void) 
{ 
    colorType = !colorType; 
} 
 
static void CALLBACK Key_t(void) 
{ 
    textureType = !textureType; 
} 
 
static void CALLBACK Key_l(void) 
{ 
    lighting =! lighting; 
    if (lighting) { 
        glEnable(GL_LIGHTING); 
        glEnable(GL_LIGHT0); 
        glEnable(GL_AUTO_NORMAL); 
    } else { 
        glDisable(GL_LIGHTING); 
        glDisable(GL_LIGHT0); 
        glDisable(GL_AUTO_NORMAL); 
    } 
} 
 
static void CALLBACK Draw(void) 
{ 
 
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 
 
    glPushMatrix(); 
 
    glTranslatef(0.0, 0.0 , translateZ); 
    glRotatef(rotX, 1, 0, 0); 
    glRotatef(rotY, 0, 1, 0); 
    RenderEval(); 
 
    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 { 
        //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(); 
    } 
 
    auxInitPosition(0, 0, 300, 300); 
 
    type = AUX_RGB | AUX_DEPTH16; 
    type |= (doubleBuffer) ? AUX_DOUBLE : AUX_SINGLE; 
 
    auxInitDisplayMode(type); 
 
    if (auxInitWindow("Evaluator 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_1, Key_1); 
    auxKeyFunc(AUX_2, Key_2); 
    auxKeyFunc(AUX_e, Key_e); 
    auxKeyFunc(AUX_m, Key_m); 
    auxKeyFunc(AUX_f, Key_f); 
    auxKeyFunc(AUX_p, Key_p); 
    auxKeyFunc(AUX_c, Key_c); 
    auxKeyFunc(AUX_t, Key_t); 
    auxKeyFunc(AUX_l, Key_l); 
    auxMainLoop(Draw); 
}