objects/oOlmecDebris/step.gml
From spelunky.gmk, Spelunky Classic 1.1's source, © 2008, 2009 Derek Yu and Mossmouth, LLC, shown whole under the Spelunky User License v1.1b. Extracted by spelunky.ai's tools, an unofficial fan project, one file per script or event; the // ==== lines are the extractor's, naming each action of the event. Some scripts are others' work that Derek Yu credits in the source's readme.txt: Martin Piecyk's platform engine, ChevyRay's view scaling scripts and tsg1zzn's Super Sound System.
oOlmecDebris's step event, 27 lines of GML.
// ==== action 0: lib 1 id 604: action_inherited() ====// ==== action 1: lib 1 id 603: code ====x += xVel;y += yVel;if (bounce){ if (yVel < 6) { yVel += grav; } if (collision_point(x, y+4, oTemple, 0, 0)) { // bounce if (yVel > 1) yVel = -yVel * 0.4; else { instance_create(x, y, oSmokePuff); instance_destroy(); } // friction if (abs(xVel) < 0.1) xVel = 0; else if (abs(xVel) != 0) xVel *= 0.3; }}