indrajith/RCBASIC4
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Added delta timestep to 2d simulation

Browse Source
This commit is contained in:
n00b
2024-12-01 00:15:41 -05:00
parent f008cf839b
commit cfad58b99c
12 changed files with 1083 additions and 537 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
rcbasic_runtime/rc_gfx.h
View File

@@ -946,7 +946,8 @@ int rc_canvasOpen(int w, int h, int vx, int vy, int vw, int vh, int mode, int ca
{
b2Vec2 gravity(0, 0);
canvas.physics2D.world = new b2World(gravity);
canvas.physics2D.timeStep = 1/60.0; //the length of time passed to simulate (seconds)
canvas.physics2D.timeStep = -1; //the length of time passed to simulate (seconds)
canvas.physics2D.time_stamp = SDL_GetTicks();
canvas.physics2D.velocityIterations = 8; //how strongly to correct velocity
canvas.physics2D.positionIterations = 3; //how strongly to correct position
canvas.physics2D.enabled = true;
@@ -3056,7 +3057,9 @@ void rc_preUpdate()
if(rc_canvas[i].type != RC_CANVAS_TYPE_SPRITE)
continue;
float step = rc_canvas[i].physics2D.timeStep;
Uint32 delta_time = SDL_GetTicks() - rc_canvas[i].physics2D.time_stamp;
rc_canvas[i].physics2D.time_stamp = SDL_GetTicks();
float step = rc_canvas[i].physics2D.timeStep < 0 ? (delta_time*0.001f) : rc_canvas[i].physics2D.timeStep;
int32 velocityIterations = rc_canvas[i].physics2D.velocityIterations;
int32 positionIterations = rc_canvas[i].physics2D.positionIterations;