146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
#include "prosperon.h"
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#include "cell.h"
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#include "HandmadeMath.h"
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struct sprite{
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HMM_Vec2 pos; // x,y coordinates of the sprite
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HMM_Vec2 center;
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HMM_Vec2 skew;
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HMM_Vec2 scale;
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float rotation;
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HMM_Mat2 affine;
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JSValue image; // the JS image
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int layer; // layer this sprite draws onto
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HMM_Vec4 color; // color in 0-1f
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};
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typedef struct sprite sprite;
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sprite *make_sprite(void)
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{
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sprite *sprite = calloc(sizeof(*sprite),1);
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sprite->image = JS_NULL;
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return sprite;
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}
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void sprite_free(JSRuntime *rt, sprite *sprite)
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{
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JS_FreeValueRT(rt,sprite->image);
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free(sprite);
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}
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void sprite_apply(sprite *sp)
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{
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/* -------- rotation + skew → 2×2 affine matrix -------- */
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float rot = sp->rotation;
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HMM_Vec2 k = sp->skew;
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float c = cosf(rot), s = sinf(rot);
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sp->affine.Columns[0] = (HMM_Vec2){ .x = c + k.x * s,
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.y = k.y * c + s };
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sp->affine.Columns[1] = (HMM_Vec2){ .x = -s + k.x * c,
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.y = -k.y * s + c };
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}
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// Sprite class definitions
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static JSClassID js_sprite_id;
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static void js_sprite_mark(JSRuntime *rt, JSValueConst val, JS_MarkFunc *mark_func) {
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sprite *sp = JS_GetOpaque(val, js_sprite_id);
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if (!sp) return;
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JS_MarkValue(rt, sp->image, mark_func);
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}
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// Class definition for sprite with mark function for GC
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QJSCLASSMARK(sprite,)
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// SPRITE GETTER/SETTER FUNCTIONS
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JSC_GETSET(sprite, pos, vec2)
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JSC_GETSET(sprite, center, vec2)
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JSC_GETSET(sprite, layer, number)
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JSC_GETSET(sprite, color, color)
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JSC_GETSET(sprite, skew, vec2)
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JSC_GETSET(sprite, scale, vec2)
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JSC_GETSET(sprite, rotation, number)
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// SPRITE ACTION FUNCTIONS
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JSC_CCALL(sprite_move,
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sprite *sp = js2sprite(js,self);
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HMM_Vec2 mv = js2vec2(js,argv[0]);
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sp->pos.x += mv.x;
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sp->pos.y += mv.y;
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)
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JSC_CCALL(sprite_set_affine,
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sprite *sp = js2sprite(js,self);
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sprite_apply(sp);
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)
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JSC_CCALL(sprite_set_image,
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sprite *sp = js2sprite(js,self);
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if (!JS_IsNull(sp->image))
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JS_FreeValue(js,sp->image);
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sp->image = JS_DupValue(js, argv[0]);
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)
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static const JSCFunctionListEntry js_sprite_funcs[] = {
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MIST_FUNC_DEF(sprite, set_affine, 0),
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MIST_FUNC_DEF(sprite, set_image, 1),
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MIST_FUNC_DEF(sprite, move, 1),
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JS_CGETSET_DEF("pos", js_sprite_get_pos, js_sprite_set_pos),
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JS_CGETSET_DEF("scale", js_sprite_get_scale, js_sprite_set_scale),
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JS_CGETSET_DEF("skew", js_sprite_get_skew, js_sprite_set_skew),
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JS_CGETSET_DEF("layer", js_sprite_get_layer, js_sprite_set_layer),
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JS_CGETSET_DEF("color", js_sprite_get_color, js_sprite_set_color),
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JS_CGETSET_DEF("center", js_sprite_get_center, js_sprite_set_center),
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JS_CGETSET_DEF("rotation", js_sprite_get_rotation, js_sprite_set_rotation),
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};
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// Constructor function for sprite
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static JSValue js_sprite_constructor(JSContext *js, JSValueConst new_target, int argc, JSValueConst *argv) {
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sprite *sp = make_sprite();
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if (!sp) return JS_ThrowOutOfMemory(js);
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// If an options object is provided, initialize the sprite with it
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if (argc > 0 && JS_IsObject(argv[0])) {
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JS_GETATOM(js, sp->pos, argv[0], pos, vec2)
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JS_GETATOM(js, sp->center, argv[0], center, vec2)
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JS_GETATOM(js, sp->skew, argv[0], skew, vec2)
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JS_GETATOM(js, sp->scale, argv[0], scale, vec2)
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JS_GETATOM(js, sp->rotation, argv[0], rotation, number)
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JS_GETATOM(js, sp->layer, argv[0], layer, number)
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JS_GETATOM(js, sp->color, argv[0], color, color)
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JSValue image = JS_GetProperty(js, argv[0], JS_NewAtom(js, "image"));
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if (!JS_IsNull(image)) {
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sp->image = image; // Transfer ownership, no need to dup
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}
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}
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// Default values if not provided
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if (sp->scale.x == 0 && sp->scale.y == 0) {
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sp->scale.x = 1;
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sp->scale.y = 1;
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}
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if (sp->color.w == 0) sp->color.w = 1; // Default alpha to 1
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sprite_apply(sp);
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return sprite2js(js, sp);
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}
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CELL_USE_INIT(
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// Register the sprite class
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QJSCLASSPREP_FUNCS(sprite);
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// Create the constructor function
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JSValue ctor = JS_NewCFunction2(js, js_sprite_constructor, "sprite", 1, JS_CFUNC_constructor, 0);
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// Set the prototype on the constructor
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JSValue proto = JS_GetClassProto(js, js_sprite_id);
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JS_SetConstructor(js, ctor, proto);
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JS_FreeValue(js, proto);
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return ctor;
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) |