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fix: left button drift

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This commit is contained in:
Krzysztof kuhy Rudnicki 2025-08-24 13:23:58 +02:00
parent f91423c56c
commit b6fb50479f
1 changed files with 25 additions and 8 deletions
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33
C/fps/main.c
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@ -13,6 +13,7 @@
#include <time.h>
#include <string.h>
#include <SDL2/SDL.h>
#include <ctype.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
@ -364,14 +365,19 @@ static void display()
static void update(float dt)
{
if (g_state == GAME_RUNNING) {
float speed = g_move_speed * ((g_keys['\t'] || g_keys['Q'] || g_keys['q']) ? g_sprint_mul : 1.0f); // Tab/Q to sprint
float speed = g_move_speed * ((g_keys['\t'] || g_keys['q']) ? g_sprint_mul : 1.0f); // Tab/q to sprint
vec3 f = cam_front(); f.y = 0.0f; f = v3_norm(f);
vec3 r = cam_right(); r.y = 0.0f; r = v3_norm(r);
if (g_keys['W'] || g_keys['w']) g_cam_pos = v3_add(g_cam_pos, v3_scale(f, speed*dt));
if (g_keys['S'] || g_keys['s']) g_cam_pos = v3_sub(g_cam_pos, v3_scale(f, speed*dt));
if (g_keys['A'] || g_keys['a']) g_cam_pos = v3_sub(g_cam_pos, v3_scale(r, speed*dt));
if (g_keys['D'] || g_keys['d']) g_cam_pos = v3_add(g_cam_pos, v3_scale(r, speed*dt));
// Accumulate movement and apply once to avoid drift artifacts
vec3 mv = v3(0,0,0);
if (g_keys['w']) mv = v3_add(mv, f);
if (g_keys['s']) mv = v3_sub(mv, f);
if (g_keys['a']) mv = v3_sub(mv, r);
if (g_keys['d']) mv = v3_add(mv, r);
if (v3_len(mv) > 0.0f) {
mv = v3_norm(mv);
g_cam_pos = v3_add(g_cam_pos, v3_scale(mv, speed*dt));
}
// Keep feet on ground
g_cam_pos.y = 1.6f;
@ -436,7 +442,8 @@ static void reshape(int w, int h)
static void keyboard_down(unsigned char key, int x, int y)
{
(void)x; (void)y;
g_keys[key] = true;
unsigned char k = (unsigned char)tolower(key);
g_keys[k] = true;
if (key == 27) { // Esc
exit(0);
} else if (key == ' ') {
@ -459,7 +466,8 @@ static void keyboard_down(unsigned char key, int x, int y)
static void keyboard_up(unsigned char key, int x, int y)
{
(void)x; (void)y;
g_keys[key] = false;
unsigned char k = (unsigned char)tolower(key);
g_keys[k] = false;
}
static void mouse_button(int button, int state, int x, int y)
@ -500,6 +508,13 @@ static void init_gl()
glLineWidth(1.0f);
}
static void on_entry(int state)
{
if (state != GLUT_ENTERED) {
for (int i = 0; i < 256; ++i) g_keys[i] = false;
}
}
int main(int argc, char** argv)
{
(void)argv;
@ -518,6 +533,8 @@ int main(int argc, char** argv)
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard_down);
glutKeyboardUpFunc(keyboard_up);
// Clear keys on focus leave to avoid stuck inputs
glutEntryFunc(on_entry);
glutPassiveMotionFunc(passive_motion);
glutMouseFunc(mouse_button);