Rendering a moving square entirely from lua.

src/scene/scene.c

@@ -7,11 +7,18 @@
 #include "assert/assert.h"
 #include "util/memory.h"
 
+#include "display/camera.h"
+#include "display/screen.h"
+
 scene_t SCENE;
 
+camera_t cam;
+
 errorret_t sceneInit(void) {
   memoryZero(&SCENE, sizeof(scene_t));
 
+  cameraInitOrthographic(&cam);
+
   errorChain(scriptContextInit(&SCENE.scriptContext));
   errorOk();
 }
@@ -32,9 +39,16 @@ void sceneRender(void) {
     return;
   }
 
+  cam.orthographic.right = SCREEN.width;
+  cam.orthographic.bottom = SCREEN.height;
+  cam.orthographic.left = 0.0f;
+  cam.orthographic.top = 0.0f;
+  cameraPushMatrix(&cam);
+
   errorret_t err = scriptContextCallFunc(
     &SCENE.scriptContext, "sceneRender", NULL, 0, NULL
   );
+  cameraPopMatrix();
   errorCatch(errorPrint(err));
 }