# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1320279526 -7200
# Node ID dfe7c98cf373a1b65aad11bbb1f1eef18ad70b4f
# Parent  c27b24c9fdd2974efe1977beb8d0a55fabcdf588
added stereo rendering

diff -r c27b24c9fdd2 -r dfe7c98cf373 sdr/julia.p.glsl
--- a/sdr/julia.p.glsl	Wed Oct 05 02:26:46 2011 +0300
+++ b/sdr/julia.p.glsl	Thu Nov 03 02:18:46 2011 +0200
@@ -5,6 +5,7 @@
 uniform int iter;
 uniform float reflectivity;
 uniform vec3 diffuse_color;
+uniform float eye_offs;
 
 #define quat(s, x, y, z)	vec4(x, y, z, s)
 #define quat_identity()		vec4(0.0, 0.0, 0.0, 1.0)
@@ -298,7 +299,7 @@
 	Ray ray;
 	vec2 tc = gl_TexCoord[0].xy;
 	ray.dir = gl_NormalMatrix * normalize(texture2D(ray_tex, tc).xyz);
-	ray.origin = (gl_ModelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
+	ray.origin = (gl_ModelViewMatrix * vec4(eye_offs, 0.0, 0.0, 1.0)).xyz;
 	return ray;
 }
 
diff -r c27b24c9fdd2 -r dfe7c98cf373 src/rayfract.cc
--- a/src/rayfract.cc	Wed Oct 05 02:26:46 2011 +0300
+++ b/src/rayfract.cc	Thu Nov 03 02:18:46 2011 +0200
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <math.h>
 #include <assert.h>
 #include <GL/glew.h>
@@ -11,6 +12,7 @@
 #define DEG_TO_RAD(x)	(M_PI * (x) / 180.0)
 
 void disp();
+void render();
 void reshape(int x, int y);
 void keyb(unsigned char key, int x, int y);
 void keyb_up(unsigned char key, int x, int y);
@@ -27,6 +29,9 @@
 static Vector3 get_primary_ray_dir(int x, int y, int w, int h, float vfov_deg);
 static int round_pow2(int x);
 
+int parse_opt(int argc, char **argv);
+
+
 float cam_theta = 0, cam_phi = 0, cam_dist = 4.0;
 float cam_x, cam_y, cam_z;
 
@@ -39,6 +44,9 @@
 float reflectivity = 0.2;
 Vector3 color(0.75, 0.75, 0.75);
 
+int use_stereo;
+float eye_sep = 0.5;
+
 int main(int argc, char **argv)
 {
 	int xsz, ysz;
@@ -47,7 +55,12 @@
 
 	glutInitWindowSize(640, 480);
 	glutInit(&argc, argv);
-	glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
+
+	if(parse_opt(argc, argv) == -1) {
+		return 1;
+	}
+
+	glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | (use_stereo ? GLUT_STEREO : 0));
 	glutCreateWindow("Raytraced Fractals");
 	xsz = glutGet(GLUT_WINDOW_WIDTH);
 	ysz = glutGet(GLUT_WINDOW_HEIGHT);
@@ -63,13 +76,14 @@
 	glutSpaceballRotateFunc(sball_rot);
 	glutSpaceballButtonFunc(sball_button);
 
-	glEnable(GL_DEPTH_TEST);
-	glEnable(GL_LIGHTING);
-	glEnable(GL_LIGHT0);
-	glEnable(GL_CULL_FACE);
+	if(getenv("STEREO_METHOD") && strcmp(getenv("STEREO_METHOD"), "sequential") == 0) {
+		glutIdleFunc(glutPostRedisplay);
+	}
 
 	glewInit();
 
+	glEnable(GL_CULL_FACE);
+
 	if(load_shader() == -1) {
 		return 1;
 	}
@@ -102,8 +116,6 @@
 
 void disp()
 {
-	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
 	glTranslatef(cam_x, cam_y, -cam_z);
@@ -121,11 +133,35 @@
 	set_uniform_float(sdr, "err_thres", err_thres);
 	set_uniform_float3(sdr, "diffuse_color", color.x, color.y, color.z);
 
+	glBindTexture(GL_TEXTURE_2D, ray_tex);
+
+
+	if(use_stereo) {
+		glDrawBuffer(GL_BACK_LEFT);
+		set_uniform_float(sdr, "eye_offs", -eye_sep / 2.0);
+	} else {
+		set_uniform_float(sdr, "eye_offs", 0);
+	}
+
+	render();
+
+	if(use_stereo) {
+		glDrawBuffer(GL_BACK_RIGHT);
+
+		set_uniform_float(sdr, "eye_offs", eye_sep / 2.0);
+		render();
+	}
+
+	glutSwapBuffers();
+	assert(glGetError() == GL_NO_ERROR);
+}
+
+void render()
+{
 	glMatrixMode(GL_TEXTURE);
 	glPushMatrix();
 	glScalef(tex_scale.x, tex_scale.y, 1.0);
 
-	glBindTexture(GL_TEXTURE_2D, ray_tex);
 	glEnable(GL_TEXTURE_2D);
 	bind_program(sdr);
 
@@ -144,9 +180,6 @@
 	glPopMatrix();
 
 	gui_draw();
-
-	glutSwapBuffers();
-	assert(glGetError() == GL_NO_ERROR);
 }
 
 void reshape(int x, int y)
@@ -206,6 +239,11 @@
 		glutPostRedisplay();
 		break;
 
+	case 'S':
+		use_stereo = !use_stereo;
+		glutPostRedisplay();
+		break;
+
 	case 'r':
 		reflectivity = reflectivity > 0.0 ? 0.0 : 0.6;
 		set_uniform_float(sdr, "reflectivity", reflectivity);
@@ -221,6 +259,19 @@
 		}
 		break;
 
+	case '[':
+		eye_sep -= 0.1;
+		printf("eye separation: %f\n", eye_sep);
+		glutPostRedisplay();
+		break;
+
+	case ']':
+		eye_sep += 0.1;
+		printf("eye separation: %f\n", eye_sep);
+		glutPostRedisplay();
+		break;
+
+
 	case '\n':
 	case '\r':
 		printf("(%.3f %+.3fi %+.3fj %+.3fk) i:%d err: %.4f cam(theta: %.2f phi: %.2f rad: %.2f)\n", seed.w,
@@ -411,3 +462,29 @@
 	x = (x >> 16) | x;
 	return x + 1;
 }
+
+int parse_opt(int argc, char **argv)
+{
+	int i;
+
+	for(i=1; i<argc; i++) {
+		if(argv[i][0] == '-' && argv[i][2] == 0) {
+			switch(argv[i][1]) {
+			case 's':
+				use_stereo = !use_stereo;
+				break;
+
+			default:
+				goto invalid;
+			}
+		} else {
+			goto invalid;
+		}
+	}
+
+	return 0;
+
+invalid:
+	fprintf(stderr, "invalid option: %s\n", argv[i]);
+	return -1;
+}