From b656c9415a8e7e3b5b7d8bf1f3c8a5444f830c79 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sat, 22 Feb 2020 23:33:06 +0800
Subject: *misc

---
 src/extend/camera.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

(limited to 'src/extend/camera.c')

diff --git a/src/extend/camera.c b/src/extend/camera.c
index e69de29..377a09e 100644
--- a/src/extend/camera.c
+++ b/src/extend/camera.c
@@ -0,0 +1,55 @@
+#include "camera.h"
+
+void camera_init(Camera* cam) {
+	cam->is_viewdirty = cam->is_projdirty = TRUE;
+	cam->transform.parent = NULL ;
+	cam->transform.localposition = vec3_make(0, 0, 800);
+	cam->transform.localscale = vec3_make(1, 1, 1);
+	cam->transform.localrotation = quat_make(0, 0, 0);
+	cam->near = 1; 
+	cam->far = 1500;
+	cam->aspect = 600/500.f;
+	cam->fov = 90;
+	cam->zoom_speed = 20;
+}
+
+void camera_getmatrix(Camera* cam, Mat4* view, Mat4* proj) {
+	camera_getviewmatrix(cam, view);
+	camera_getprojmatrix(cam, proj);
+}
+
+void camera_getviewmatrix(Camera* cam, Mat4* out) {
+	if (!cam->is_viewdirty) {
+		if (out)*out = cam->view_matrix;
+		return;
+	}
+	transform_getinvmatrixnoscale(&cam->transform, &cam->view_matrix);
+	if(out) *out = cam->view_matrix;
+	cam->is_viewdirty = FALSE;
+}
+
+void camera_getprojmatrix(Camera* cam, Mat4* out) {
+	if (!cam->is_projdirty) {
+		if (out)*out = cam->proj_matrix;
+		return;
+	}
+	mat4_setperspective(cam->fov, cam->aspect, cam->near, cam->far, &cam->proj_matrix);
+	if(out) *out = cam->proj_matrix;
+	cam->is_projdirty = FALSE;
+}
+
+static void _onwheelscroll(Camera* cam, int wheel) {
+	Quat rot; transform_getrotation(&cam->transform, &rot);
+	Vec3 forward = {0,0,-1};
+	quat_applytovec3(&rot, &forward, &forward);
+	vec3_scale(&forward, cam->zoom_speed * wheel, &forward);
+	vec3_plus(&forward, &cam->transform.localposition, &cam->transform.localposition);
+	cam->is_viewdirty = TRUE;
+}
+
+void camera_onevent(Camera* cam, wog_Event* e) {
+	if(e == NULL) return ;
+	if (e->type == WOG_EMOUSEWHEEL) {//zoom in\zoom out
+		_onwheelscroll(cam, e->wheel);
+	}
+}
-- 
cgit v1.1-26-g67d0