# HG changeset patch
# User John Tsiombikas <nuclear@mutantstargoat.com>
# Date 1315379735 -10800
# Node ID 21d58290e634d50cb86262f5ad3b6c3edd78231f
# Parent  ab4972098eb72a34c3fbfce551f75ee0975889ef
forgot the cam files

diff -r ab4972098eb7 -r 21d58290e634 src/cam.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cam.c	Wed Sep 07 10:15:35 2011 +0300
@@ -0,0 +1,170 @@
+#include <math.h>
+#include "opengl.h"
+#include "cam.h"
+#include "sanegl.h"
+
+#define DEG_TO_RAD(x)	(M_PI * (x) / 180.0)
+
+typedef struct vec3 {
+	float x, y, z;
+} vec3_t;
+
+/* viewing parameters */
+#define DEF_THETA	0
+#define DEF_PHI		0
+#define DEF_DIST	0
+#define DEF_X		0
+#define DEF_Y		0
+#define DEF_Z		0
+
+static float cam_theta = DEF_THETA, cam_phi = DEF_PHI;
+static float cam_dist = DEF_DIST;
+static vec3_t cam_pos = {DEF_X, DEF_Y, DEF_Z};
+static float cam_speed = 1.0;
+
+/* projection parameters */
+#define DEF_VFOV	45.0
+#define DEF_ASPECT	1.3333333
+#define DEF_NEAR	1.0
+#define DEF_FAR		1000.0
+
+static float vfov = DEF_VFOV;
+static float aspect = DEF_ASPECT;
+static float nearclip = DEF_NEAR, farclip = DEF_FAR;
+
+/* stereo parameters */
+#define DEF_EYE_SEP		0.1
+#define DEF_FOCUS_DIST	1.0
+
+static float eye_sep = DEF_EYE_SEP;
+static float focus_dist = DEF_FOCUS_DIST;
+
+
+static float rot_speed = 0.5;
+static float zoom_speed = 0.1;
+
+void cam_reset(void)
+{
+	cam_reset_view();
+	cam_reset_proj();
+	cam_reset_stereo();
+}
+
+void cam_reset_view(void)
+{
+	cam_theta = DEF_THETA;
+	cam_phi = DEF_PHI;
+	cam_dist = DEF_DIST;
+	cam_pos.x = DEF_X;
+	cam_pos.y = DEF_Y;
+	cam_pos.z = DEF_Z;
+}
+
+void cam_reset_proj(void)
+{
+	vfov = DEF_VFOV;
+	aspect = DEF_ASPECT;
+	nearclip = DEF_NEAR;
+	farclip = DEF_FAR;
+}
+
+void cam_reset_stereo(void)
+{
+	eye_sep = DEF_EYE_SEP;
+	focus_dist = DEF_FOCUS_DIST;
+}
+
+void cam_pan(int dx, int dy)
+{
+	float dxf = dx * cam_speed;
+	float dyf = dy * cam_speed;
+	float angle = -DEG_TO_RAD(cam_theta);
+
+	cam_pos.x += cos(angle) * dxf + sin(angle) * dyf;
+	cam_pos.z += -sin(angle) * dxf + cos(angle) * dyf;
+}
+
+void cam_height(int dh)
+{
+	cam_pos.y += dh * cam_speed;
+}
+
+void cam_rotate(int dx, int dy)
+{
+	cam_theta += dx * rot_speed;
+	cam_phi += dy * rot_speed;
+
+	if(cam_phi < -90) cam_phi = -90;
+	if(cam_phi > 90) cam_phi = 90;
+}
+
+void cam_zoom(int dz)
+{
+	cam_dist += dz * zoom_speed;
+	if(cam_dist < 0.001) {
+		cam_dist = 0.001;
+	}
+}
+
+void cam_clip(float n, float f)
+{
+	nearclip = n;
+	farclip = f;
+}
+
+void cam_fov(float f)
+{
+	vfov = f;
+}
+
+void cam_aspect(float a)
+{
+	aspect = a;
+}
+
+void cam_separation(float s)
+{
+	eye_sep = s;
+}
+
+void cam_focus_dist(float d)
+{
+	focus_dist = d;
+
+	cam_separation(d / 30.0);
+}
+
+void cam_view_matrix(void)
+{
+	cam_stereo_view_matrix(CAM_CENTER);
+}
+
+void cam_stereo_view_matrix(int eye)
+{
+	static const float offs_sign[] = {0.0f, 0.5f, -0.5f};	/* center, left, right */
+	float offs = eye_sep * offs_sign[eye];
+
+	gl_translatef(offs, 0, 0);
+
+	gl_translatef(0, 0, -cam_dist);
+	gl_rotatef(cam_phi, 1, 0, 0);
+	gl_rotatef(cam_theta, 0, 1, 0);
+	gl_translatef(-cam_pos.x, -cam_pos.y, -cam_pos.z);
+}
+
+void cam_proj_matrix(void)
+{
+	cam_stereo_proj_matrix(CAM_CENTER);
+}
+
+void cam_stereo_proj_matrix(int eye)
+{
+	float vfov_rad = M_PI * vfov / 180.0;
+	float top = nearclip * tan(vfov_rad * 0.5);
+	float right = top * aspect;
+
+	static const float offs_sign[] = {0.0f, 1.0, -1.0};	/* center, left, right */
+	float frust_shift = offs_sign[eye] * (eye_sep * 0.5 * nearclip / focus_dist);
+
+	gl_frustum(-right + frust_shift, right + frust_shift, -top, top, nearclip, farclip);
+}
diff -r ab4972098eb7 -r 21d58290e634 src/cam.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cam.h	Wed Sep 07 10:15:35 2011 +0300
@@ -0,0 +1,43 @@
+#ifndef CAM_H_
+#define CAM_H_
+
+enum {
+	CAM_CENTER,
+	CAM_LEFT,
+	CAM_RIGHT
+};
+
+/* reset to the initial state */
+void cam_reset(void);			/* all */
+void cam_reset_view(void);		/* view parameters */
+void cam_reset_proj(void);		/* projection parameters */
+void cam_reset_stereo(void);	/* stereo parameters */
+
+/* camera viewing parameters */
+void cam_pan(int dx, int dy);		/* pan across X/Z plane */
+void cam_height(int dh);			/* move verticaly */
+void cam_rotate(int dx, int dy);	/* rotate around local Y and X axis */
+void cam_zoom(int dz);				/* dolly the camera fwd/back */
+
+/* camera projection parameters */
+void cam_clip(float n, float f);	/* set clipping planes */
+void cam_fov(float f);				/* vertical field of view in degrees */
+void cam_aspect(float a);			/* aspect ratio (width / height) */
+
+/* stereo parameters */
+void cam_separation(float s);
+void cam_focus_dist(float d);
+
+/* multiply the camera view matrix on top of the current matrix stack
+ * (which should be GL_MODELVIEW)
+ */
+void cam_view_matrix(void);
+void cam_stereo_view_matrix(int eye);
+
+/* multiply the camera projection matrix on top of the current matrix stack
+ * (which should be GL_PROJECTION)
+ */
+void cam_proj_matrix(void);
+void cam_stereo_proj_matrix(int eye);
+
+#endif	/* CAM_H_ */