From 0fd2ff847d24709de81b5af4ffa6baa8fb9949a5 Mon Sep 17 00:00:00 2001
From: John Tsiombikas <nuclear@member.fsf.org>
Date: Sun, 16 Oct 2022 19:22:04 +0300
Subject: [PATCH] mouselook

---
 src/main.c |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 71 insertions(+), 6 deletions(-)

diff --git a/src/main.c b/src/main.c
index f690a0e..e05118b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -24,6 +24,8 @@ void idle(void);
 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);
+void mouse(int bn, int st, int x, int y);
+void motion(int x, int y);
 
 int win_width, win_height;
 
@@ -31,8 +33,10 @@ int win_width, win_height;
 #define FB_H	480
 unsigned int fb[FB_W * FB_H];
 
+int mouse_x, mouse_y, mwarp, mbstate[3];
+
 unsigned int input;
-int32_t pos[2], angle;// = 0x4000;
+int32_t pos[2], angle;
 
 struct voxscape *vox;
 
@@ -45,10 +49,12 @@ int main(int argc, char **argv)
 	glutCreateWindow("voxel landscape test");
 
 	glutDisplayFunc(display);
+	glutIdleFunc(idle);
 	glutReshapeFunc(reshape);
 	glutKeyboardFunc(keyb);
 	glutKeyboardUpFunc(keyb_up);
-	glutIdleFunc(idle);
+	glutMouseFunc(mouse);
+	glutMotionFunc(motion);
 
 	if(init() == -1) {
 		return 1;
@@ -88,14 +94,33 @@ void cleanup(void)
 
 void update(void)
 {
-	if(input & INP_FWD) pos[1] += WALK_SPEED;
-	if(input & INP_BACK) pos[1] -= WALK_SPEED;
-	if(input & INP_LEFT) pos[0] -= WALK_SPEED;
-	if(input & INP_RIGHT) pos[0] += WALK_SPEED;
+	int32_t fwd[2], right[2];
 
 	if(input & INP_LTURN) angle += TURN_SPEED;
 	if(input & INP_RTURN) angle -= TURN_SPEED;
 
+	fwd[0] = -SIN(angle);
+	fwd[1] = COS(angle);
+	right[0] = fwd[1];
+	right[1] = -fwd[0];
+
+	if(input & INP_FWD) {
+		pos[0] += fwd[0];
+		pos[1] += fwd[1];
+	}
+	if(input & INP_BACK) {
+		pos[0] -= fwd[0];
+		pos[1] -= fwd[1];
+	}
+	if(input & INP_RIGHT) {
+		pos[0] += right[0];
+		pos[1] += right[1];
+	}
+	if(input & INP_LEFT) {
+		pos[0] -= right[0];
+		pos[1] -= right[1];
+	}
+
 	vox_view(vox, pos[0], pos[1], angle);
 }
 
@@ -113,6 +138,11 @@ void display(void)
 
 	glutSwapBuffers();
 	assert(glGetError() == GL_NO_ERROR);
+
+	if(mbstate[0]) {
+		mwarp = 1;
+		glutWarpPointer(win_width / 2, win_height / 2);
+	}
 }
 
 void idle(void)
@@ -184,3 +214,38 @@ void keyb_up(unsigned char key, int x, int y)
 		break;
 	}
 }
+
+void mouse(int bn, int st, int x, int y)
+{
+	int bidx = bn - GLUT_LEFT_BUTTON;
+
+	if(bidx < 3) {
+		mbstate[bidx] = st == GLUT_DOWN;
+	}
+	mouse_x = x;
+	mouse_y = y;
+
+	if(st == GLUT_DOWN) {
+		glutSetCursor(GLUT_CURSOR_NONE);
+	} else {
+		glutSetCursor(GLUT_CURSOR_LEFT_ARROW);
+	}
+}
+
+void motion(int x, int y)
+{
+	int dx = x - mouse_x;
+	int dy = y - mouse_y;
+	mouse_x = x;
+	mouse_y = y;
+
+	if(mwarp) {
+		mwarp = 0;
+		return;
+	}
+	if(!(dx | dy)) return;
+
+	if(mbstate[0]) {
+		angle -= dx << 6;
+	}
+}
-- 
1.7.10.4