261 lines
7.1 KiB
C++
261 lines
7.1 KiB
C++
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <simgear/compiler.h>
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#include SG_GLUT_H
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#define TEXRES_X 256
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#define TEXRES_Y 256
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unsigned char env_map[TEXRES_X][TEXRES_Y][4];
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GLuint texName;
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int window_x = 640, window_y = 480;
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float alpha = 0.0, beta = 0.0;
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/*****************************************************************/
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/*****************************************************************/
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/*****************************************************************/
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void setColor(float x, float y, float z, float angular_size, float r, float g, float b, float a)
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{
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//normalize
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float inv_length = 1.0 / sqrt(x*x + y*y + z*z);
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x *= inv_length; y *= inv_length; z *= inv_length;
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printf("x = %f, y = %f, z = %f\n", x, y, z);
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float cos_angular_size = cos(angular_size*3.1415/180.0);
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printf("cos_angular_size = %f\n", cos_angular_size);
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for(float tz_sign = -1.0; tz_sign < 3.0; tz_sign += 2.0)
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{
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for(float tx = -1.0; tx <= 1.0; tx += 0.01)
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{
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for(float ty = -1.0; ty <= 1.0; ty += 0.01)
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{
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if ((1.0 - tx*tx - ty*ty)<0.0)
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continue;
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float tz = tz_sign * sqrt(1.0 - tx*tx - ty*ty);
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float cos_phi = x*tx + y*ty + z*tz;
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if (cos_angular_size < cos_phi)
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{
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float rx = tx; //mirroring on the z=0 plane
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float ry = ty;
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float rz = -tz;
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float inv_m = 1.0 / (2.0 * sqrt(rx*rx + ry*ry + (rz + 1)*(rz + 1)));
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int s = (int)(TEXRES_X * (rx * inv_m + 0.5));
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int t = (int)(TEXRES_Y * (ry * inv_m + 0.5));
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//seg_fault protection:
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if (s<0) s=0;
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if (s>=TEXRES_X) s=TEXRES_X-1;
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if (t<0) t=0;
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if (t>=TEXRES_Y) t=TEXRES_Y-1;
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env_map[s][t][0] = (unsigned char)(r * 255);
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env_map[s][t][1] = (unsigned char)(g * 255);
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env_map[s][t][2] = (unsigned char)(b * 255);
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env_map[s][t][3] = (unsigned char)(a * 255);
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}
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}
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}
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}
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}
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/*****************************************************************/
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/*****************************************************************/
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/*****************************************************************/
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void init(void)
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{
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glShadeModel(GL_FLAT);
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glEnable(GL_DEPTH_TEST);
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for(int x=0; x<TEXRES_X; x++)
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{
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for(int y=0; y<TEXRES_Y; y++)
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{
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env_map[x][y][0] = x; //a few colors
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env_map[x][y][1] = y;
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env_map[x][y][2] = 128;
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env_map[x][y][3] = 128;
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}
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}
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/*****************************************************************/
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/*****************************************************************/
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/*****************************************************************/
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// x y z ang r g b a
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setColor(0.0, 0.0, -1.0 , 23.0, 1.0, 1.0, 1.0, 1.0);
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setColor(0.7071067, 0.0, -0.7071067, 23.0, 1.0, 0.0, 0.0, 1.0);
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/*****************************************************************/
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/*****************************************************************/
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/*****************************************************************/
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glGenTextures(1, &texName);
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glBindTexture(GL_TEXTURE_2D, texName);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TEXRES_X, TEXRES_Y, 0, GL_RGBA, GL_UNSIGNED_BYTE, env_map);
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}
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void reshape(int w, int h)
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{
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window_x = w; window_y = h;
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glViewport(0, 0, (GLsizei) w, (GLsizei) h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective((GLdouble) 60.0, ((GLdouble)w)/((GLdouble)h), (GLdouble) 10.0, (GLdouble) 1000.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -20.0);
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}
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void display()
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{
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glClear ( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ) ;
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//show light
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective((GLdouble) 60.0, (float)window_x/window_y, (GLdouble) 1.0, (GLdouble) 100.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -10.0);
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glRotatef(alpha, 1.0, 0.0, 0.0);
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glRotatef(beta, 0.0, 1.0, 0.0);
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glBegin(GL_LINES);
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glColor3f(1.0, 1.0, 1.0);
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glVertex3f(0.0, 0.0, 0.0);
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glVertex3f(0.0, 0.0, 1.0);
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glEnd();
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/*****************************************************************/
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/*****************************************************************/
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/*****************************************************************/
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glEnable(GL_TEXTURE_2D);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glBindTexture(GL_TEXTURE_2D, texName);
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glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
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glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
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glEnable(GL_TEXTURE_GEN_S);
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glEnable(GL_TEXTURE_GEN_T);
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glBegin(GL_QUADS);
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glNormal3f(0.0, 0.0, 1.0);
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glVertex3f(1.0, 1.0, 0.0);
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glVertex3f(-1.0, 1.0, 0.0);
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glVertex3f(-1.0, -1.0, 0.0);
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glVertex3f(1.0, -1.0, 0.0);
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glEnd();
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/*
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glPointSize(48.0);
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glBegin(GL_POINTS);
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glNormal3f(0.0, 0.0, 1.0);
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glVertex3f(0.0, 0.0, 0.0);
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glEnd();
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*/
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glDisable(GL_TEXTURE_GEN_S);
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glDisable(GL_TEXTURE_GEN_T);
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glDisable(GL_TEXTURE_2D);
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/*****************************************************************/
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/*****************************************************************/
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/*****************************************************************/
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//show how the map looks like
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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//gluOrtho2D(0.0 -10.0, 1.0 +10.0, -(float)window_x/window_y -10.0,0.0 +10.0);
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//glOrtho(0.0, 5.0, -5.0, 0.0, -10.0, 10.0);
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glOrtho(0.0, 5.0*((float)window_x/window_y), -5.0, 0.0, -10.0, 10.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glEnable(GL_TEXTURE_2D);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
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glBindTexture(GL_TEXTURE_2D, texName);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0, 0.0); glVertex3f(0.0, 0.0, 0.0);
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glTexCoord2f(0.0, 1.0); glVertex3f(0.0, -1.0, 0.0);
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glTexCoord2f(1.0, 1.0); glVertex3f(1.0, -1.0, 0.0);
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glTexCoord2f(1.0, 0.0); glVertex3f(1.0, 0.0, 0.0);
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glEnd();
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glFlush();
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glDisable(GL_TEXTURE_2D);
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glutPostRedisplay () ;
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glutSwapBuffers () ;
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}
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void keyboard (unsigned char key, int x, int y)
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{
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switch(key)
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{
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case 27:
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exit(0);
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case '8':
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alpha += 1.0;
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if (alpha >= 360.0) alpha -= 360.0;
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break;
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case '2':
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alpha -= 1.0;
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if (alpha < 0.0) alpha += 360.0;
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break;
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case '4':
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beta -= 1.0;
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if (beta <= -90.0) beta = -90.0;
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break;
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case '6':
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beta += 1.0;
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if (beta >= 90.0) beta = 90.0;
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break;
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case '5':
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alpha = 0.0; beta = 0.0;
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break;
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}
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}
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int main(int argc, char** argv)
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{
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glutInitWindowSize(window_x, window_y);
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
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glutCreateWindow(argv[0]);
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init();
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glutDisplayFunc(display);
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glutReshapeFunc(reshape);
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glutKeyboardFunc(keyboard);
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glutMainLoop();
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return 0;
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}
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