1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/main.cc	Fri Dec 25 05:41:10 2015 +0200
     1.3 @@ -0,0 +1,197 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <assert.h>
     1.7 +#include <GL/glew.h>
     1.8 +#include <GL/glut.h>
     1.9 +#include <vmath/vmath.h>
    1.10 +#include "rend.h"
    1.11 +
    1.12 +static bool init();
    1.13 +static void cleanup();
    1.14 +static void display();
    1.15 +static void reshape(int x, int y);
    1.16 +static void keyb(unsigned char key, int x, int y);
    1.17 +static void mouse(int bn, int st, int x, int y);
    1.18 +static void motion(int x, int y);
    1.19 +static void resize_fbtex(int xsz, int ysz);
    1.20 +static void update_fbtex();
    1.21 +static int next_pow2(int x);
    1.22 +static float dfunc(float x, float y, float z);
    1.23 +
    1.24 +static int pix_scale = 2;
    1.25 +static int width = 640;
    1.26 +static int height = 384;
    1.27 +static int win_width = width * pix_scale;
    1.28 +static int win_height = height * pix_scale;
    1.29 +
    1.30 +static float *pixels;
    1.31 +static unsigned int tex;
    1.32 +static int tex_width, tex_height;
    1.33 +
    1.34 +static float cam_theta, cam_phi = 25, cam_dist = 10;
    1.35 +
    1.36 +
    1.37 +int main(int argc, char **argv)
    1.38 +{
    1.39 +	glutInit(&argc, argv);
    1.40 +	glutInitWindowSize(win_width, win_height);
    1.41 +	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    1.42 +	glutCreateWindow("distance field raytracer");
    1.43 +
    1.44 +	glutDisplayFunc(display);
    1.45 +	glutReshapeFunc(reshape);
    1.46 +	glutKeyboardFunc(keyb);
    1.47 +	glutMouseFunc(mouse);
    1.48 +	glutMotionFunc(motion);
    1.49 +
    1.50 +	if(!init()) {
    1.51 +		return 1;
    1.52 +	}
    1.53 +	atexit(cleanup);
    1.54 +
    1.55 +	glutMainLoop();
    1.56 +	return 0;
    1.57 +}
    1.58 +
    1.59 +static bool init()
    1.60 +{
    1.61 +	glewInit();
    1.62 +
    1.63 +	glEnable(GL_CULL_FACE);
    1.64 +
    1.65 +	glGenTextures(1, &tex);
    1.66 +	glBindTexture(GL_TEXTURE_2D, tex);
    1.67 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.68 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.69 +
    1.70 +	glEnable(GL_TEXTURE_2D);
    1.71 +
    1.72 +	set_distance_function(dfunc);
    1.73 +
    1.74 +	return true;
    1.75 +}
    1.76 +
    1.77 +static void cleanup()
    1.78 +{
    1.79 +	glDeleteTextures(1, &tex);
    1.80 +}
    1.81 +
    1.82 +static void display()
    1.83 +{
    1.84 +	Matrix4x4 cmat;
    1.85 +	cmat.translate(Vector3(0, 0, -cam_dist));
    1.86 +	cmat.rotate(Vector3(1, 0, 0), DEG_TO_RAD(cam_phi));
    1.87 +	cmat.rotate(Vector3(0, 1, 0), DEG_TO_RAD(cam_theta));
    1.88 +
    1.89 +	set_camera_matrix(cmat);
    1.90 +	render();
    1.91 +	update_fbtex();
    1.92 +
    1.93 +	glMatrixMode(GL_TEXTURE);
    1.94 +	glLoadIdentity();
    1.95 +	glScalef((float)tex_width / (float)width, (float)tex_height / (float)height, 1);
    1.96 +
    1.97 +	glBegin(GL_QUADS);
    1.98 +	glTexCoord2f(0, 0); glVertex2f(-1, -1);
    1.99 +	glTexCoord2f(1, 0); glVertex2f(1, -1);
   1.100 +	glTexCoord2f(1, 1); glVertex2f(1, 1);
   1.101 +	glTexCoord2f(0, 1); glVertex2f(-1, 1);
   1.102 +	glEnd();
   1.103 +
   1.104 +	glutSwapBuffers();
   1.105 +	assert(glGetError() == GL_NO_ERROR);
   1.106 +}
   1.107 +
   1.108 +static void reshape(int x, int y)
   1.109 +{
   1.110 +	static int prev_x , prev_y;
   1.111 +
   1.112 +	glViewport(0, 0, x, y);
   1.113 +	resize_fbtex(x, y);
   1.114 +
   1.115 +	if(x != prev_x || y != prev_y) {
   1.116 +		delete [] pixels;
   1.117 +		pixels = new float[x * y * 4];
   1.118 +		set_framebuffer(x, y, pixels);
   1.119 +		prev_x = x;
   1.120 +		prev_y = y;
   1.121 +	}
   1.122 +}
   1.123 +
   1.124 +static void resize_fbtex(int xsz, int ysz)
   1.125 +{
   1.126 +	int txsz = next_pow2(xsz);
   1.127 +	int tysz = next_pow2(ysz);
   1.128 +
   1.129 +	if(txsz > tex_width || tysz > tex_height) {
   1.130 +		tex_width = txsz;
   1.131 +		tex_height = tysz;
   1.132 +
   1.133 +		glBindTexture(GL_TEXTURE_2D, tex);
   1.134 +		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, txsz, tysz, 0, GL_RGBA, GL_FLOAT, 0);
   1.135 +	}
   1.136 +}
   1.137 +
   1.138 +static void update_fbtex()
   1.139 +{
   1.140 +	glBindTexture(GL_TEXTURE_2D, tex);
   1.141 +	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA, GL_FLOAT, pixels);
   1.142 +}
   1.143 +
   1.144 +static int next_pow2(int x)
   1.145 +{
   1.146 +	--x;
   1.147 +	x |= x >> 1;
   1.148 +	x |= x >> 2;
   1.149 +	x |= x >> 4;
   1.150 +	x |= x >> 8;
   1.151 +	x |= x >> 16;
   1.152 +	return x + 1;
   1.153 +}
   1.154 +
   1.155 +static float dfunc(float x, float y, float z)
   1.156 +{
   1.157 +	return sqrt(x*x + y*y + z*z) - 1.0;
   1.158 +}
   1.159 +
   1.160 +static void keyb(unsigned char key, int x, int y)
   1.161 +{
   1.162 +	switch(key) {
   1.163 +	case 27:
   1.164 +		exit(0);
   1.165 +	}
   1.166 +}
   1.167 +
   1.168 +static int prev_x, prev_y;
   1.169 +static bool bnstate[8];
   1.170 +
   1.171 +static void mouse(int bn, int st, int x, int y)
   1.172 +{
   1.173 +	bnstate[bn - GLUT_LEFT_BUTTON] = st == GLUT_DOWN;
   1.174 +	prev_x = x;
   1.175 +	prev_y = y;
   1.176 +}
   1.177 +
   1.178 +static void motion(int x, int y)
   1.179 +{
   1.180 +	int dx = x - prev_x;
   1.181 +	int dy = y - prev_y;
   1.182 +	prev_x = x;
   1.183 +	prev_y = y;
   1.184 +
   1.185 +	if(!dx && !dy) return;
   1.186 +
   1.187 +	if(bnstate[0]) {
   1.188 +		cam_theta -= dx * 0.5;
   1.189 +		cam_phi -= dy * 0.5;
   1.190 +
   1.191 +		if(cam_phi < -90) cam_phi = -90;
   1.192 +		if(cam_phi > 90) cam_phi = 90;
   1.193 +		glutPostRedisplay();
   1.194 +	}
   1.195 +	if(bnstate[2]) {
   1.196 +		cam_dist += dy * 0.1;
   1.197 +		if(cam_dist < 0.0) cam_dist = 0.0;
   1.198 +		glutPostRedisplay();
   1.199 +	}
   1.200 +}