cell-sdl3/render.c

#include "cell.h"
#include <SDL3/SDL.h>

#include <math.h>
#include <string.h>
#include <stdlib.h>
#include "sdl.h"
#include <assert.h>

void SDL_Renderer_free(JSRuntime *rt, SDL_Renderer *renderer) {
    if (renderer) SDL_DestroyRenderer(renderer);
}

void SDL_Texture_free(JSRuntime *rt, SDL_Texture *texture) {
    if (texture) SDL_DestroyTexture(texture);
}

QJSCLASS(SDL_Renderer,)
QJSCLASS(SDL_Texture,)

JSC_CCALL(SDL_Renderer_clear,
    SDL_Renderer *renderer = js2SDL_Renderer(js,self);
    SDL_RenderClear(renderer);
)

JSC_CCALL(SDL_Renderer_present,
    SDL_Renderer *ren = js2SDL_Renderer(js,self);
    SDL_RenderPresent(ren);
)

JSC_CCALL(SDL_Renderer_draw_color,
    SDL_Renderer *renderer = js2SDL_Renderer(js,self);
    colorf color = js2color(js,argv[0]);
    SDL_SetRenderDrawColorFloat(renderer, color.x, color.y, color.z, color.w);
)

JSC_CCALL(SDL_Renderer_rect,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (!JS_IsNull(argv[1])) {
        colorf color = js2color(js,argv[1]);  
        SDL_SetRenderDrawColorFloat(r, color.x, color.y, color.z, color.w);
    }

    if (JS_IsArray(js,argv[0])) {
        int len = JS_ArrayLength(js,argv[0]);
        rect rects[len];
        for (int i = 0; i < len; i++) {
            JSValue val = JS_GetPropertyUint32(js,argv[0],i);
            rects[i] = js2rect(js,val);
            JS_FreeValue(js,val);
        }
        SDL_RenderFillRects(r,rects,len);
    } else {
        rect rect_var = js2rect(js,argv[0]);
        SDL_RenderFillRect(r,&rect_var);
    }
)

JSC_CCALL(SDL_Renderer_fillrect,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (!JS_IsNull(argv[1])) {
        colorf color = js2color(js,argv[1]);  
        SDL_SetRenderDrawColorFloat(r, color.x, color.y, color.z, color.w);
    }

    if (JS_IsArray(js,argv[0])) {
        int len = JS_ArrayLength(js,argv[0]);
        rect rects[len];
        for (int i = 0; i < len; i++) {
            JSValue val = JS_GetPropertyUint32(js,argv[0],i);
            rects[i] = js2rect(js,val);
            JS_FreeValue(js,val);
        }
        SDL_RenderFillRects(r,rects,len);
    } else {
        rect rect_var = js2rect(js,argv[0]);
        SDL_RenderFillRect(r,&rect_var);
    }
    return JS_NULL;
)

JSC_CCALL(renderer_texture,
    SDL_Renderer *renderer = js2SDL_Renderer(js,self);
    SDL_Texture *tex = js2SDL_Texture(js,argv[0]);
    rect dst = js2rect(js,argv[1]);
  
    if (!JS_IsNull(argv[3])) {
        colorf color = js2color(js,argv[3]);
        SDL_SetTextureColorModFloat(tex, color.x, color.y, color.z);
        SDL_SetTextureAlphaModFloat(tex,color.w);
    }
    if (JS_IsNull(argv[2]))
        SDL_RenderTexture(renderer,tex,NULL,&dst);
    else {
        rect src = js2rect(js,argv[2]);
        SDL_RenderTextureRotated(renderer, tex, &src, &dst, 0, NULL, SDL_FLIP_NONE);
    }
)

JSC_CCALL(renderer_load_texture,
    SDL_Renderer *renderer = js2SDL_Renderer(js, self);
    SDL_Surface *surf = js2SDL_Surface(js, argv[0]);
    SDL_Texture *tex = SDL_CreateTextureFromSurface(renderer, surf);
    if (!tex) return JS_ThrowReferenceError(js, "Could not create texture from surface: %s", SDL_GetError());
    ret = SDL_Texture2js(js, tex);
    JS_SetPropertyStr(js, ret, "width", number2js(js,tex->w));
    JS_SetPropertyStr(js,ret,"height", number2js(js,tex->h));
)

JSC_CCALL(renderer_get_image,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    SDL_Surface *surf;
    rect rect;
    if (JS_IsNull(argv[0]))
        surf = SDL_RenderReadPixels(r,NULL);
    else {
        rect = js2rect(js,argv[0]);
        surf = SDL_RenderReadPixels(r,&rect);
    }
    if (!surf) return JS_ThrowReferenceError(js, "could not make surface from renderer");
    return SDL_Surface2js(js,surf);
)

JSC_CCALL(renderer_line,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (!JS_IsNull(argv[1])) {
        colorf color = js2color(js,argv[1]);  
        SDL_SetRenderDrawColorFloat(r, color.x, color.y, color.z, color.w);
    }

    if (JS_IsArray(js,argv[0])) {
        int len = JS_ArrayLength(js,argv[0]);
        vec2 points[len];
        assert(sizeof(vec2) == sizeof(SDL_FPoint));
        for (int i = 0; i < len; i++) {
            JSValue val = JS_GetPropertyUint32(js,argv[0],i);
            points[i] = js2vec2(js,val);
            JS_FreeValue(js,val);
        }
        SDL_RenderLines(r,points,len);
    }
)

JSC_CCALL(renderer_point,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (!JS_IsNull(argv[1])) {
        colorf color = js2color(js,argv[1]);  
        SDL_SetRenderDrawColorFloat(r, color.x, color.y, color.z, color.w);
    }

    if (JS_IsArray(js,argv[0])) {
        int len = JS_ArrayLength(js,argv[0]);
        vec2 points[len];
        assert(sizeof(vec2) ==sizeof(SDL_FPoint));
        for (int i = 0; i < len; i++) {
            JSValue val = JS_GetPropertyUint32(js,argv[0],i);
            points[i] = js2vec2(js,val);
            JS_FreeValue(js,val);
        }
        SDL_RenderPoints(r, points, len);
        return JS_NULL;
    }

    vec2 point = js2vec2(js,argv[0]);
    SDL_RenderPoint(r,point.x,point.y);
)

JSC_CCALL(renderer_logical_size,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    vec2 v = js2vec2(js,argv[0]);
    SDL_SetRenderLogicalPresentation(r,v.x,v.y,SDL_LOGICAL_PRESENTATION_INTEGER_SCALE);
)

JSC_CCALL(renderer_viewport,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (JS_IsNull(argv[0]))
        SDL_SetRenderViewport(r,NULL);
    else {
        rect view = js2rect(js,argv[0]);
        SDL_SetRenderViewport(r,&view);
    }
    return JS_NULL;
)

JSC_CCALL(renderer_clip,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (JS_IsNull(argv[0]))
        SDL_SetRenderClipRect(r,NULL);
    else {
        rect view = js2rect(js,argv[0]);
        SDL_SetRenderClipRect(r,&view);
    }
)

JSC_CCALL(renderer_scale,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    vec2 v = js2vec2(js,argv[0]);
    SDL_SetRenderScale(r, v.x, v.y);
)

JSC_CCALL(renderer_vsync,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    SDL_SetRenderVSync(r,js2number(js,argv[0]));
)

JSC_CCALL(renderer_target,
    SDL_Renderer *r = js2SDL_Renderer(js,self);
    if (JS_IsNull(argv[0]))
        SDL_SetRenderTarget(r, NULL);
    else {
        SDL_Texture *tex = js2SDL_Texture(js,argv[0]);
        SDL_SetRenderTarget(r,tex);
    }
)

static const JSCFunctionListEntry js_SDL_Renderer_funcs[] = {
    JS_CFUNC_DEF("clear",          0, js_SDL_Renderer_clear),
    JS_CFUNC_DEF("present",        0, js_SDL_Renderer_present),
    JS_CFUNC_DEF("draw_color",     1, js_SDL_Renderer_draw_color),
    JS_CFUNC_DEF("rect",            2, js_SDL_Renderer_rect),
    JS_CFUNC_DEF("fillrect",        2, js_SDL_Renderer_fillrect),
    JS_CFUNC_DEF("line",            2, js_renderer_line),
    JS_CFUNC_DEF("point",           2, js_renderer_point),
    JS_CFUNC_DEF("texture",         4, js_renderer_texture),
    JS_CFUNC_DEF("get_image",       1, js_renderer_get_image),
    JS_CFUNC_DEF("scale",           1, js_renderer_scale),
    JS_CFUNC_DEF("logical_size",    1, js_renderer_logical_size),
    JS_CFUNC_DEF("viewport",        1, js_renderer_viewport),
    JS_CFUNC_DEF("clip",            1, js_renderer_clip),
    JS_CFUNC_DEF("vsync",           1, js_renderer_vsync),
    JS_CFUNC_DEF("target",          1, js_renderer_target),
    JS_CFUNC_DEF("load_texture",    1, js_renderer_load_texture),
};

JSC_CCALL(SDL_Renderer_constructor,
    if (argc < 1) return JS_ThrowTypeError(js, "Renderer constructor requires a window argument");
    SDL_Window *win = js2SDL_Window(js, argv[0]);
    SDL_Renderer *r = SDL_CreateRenderer(win, NULL);
    if (!r) return JS_ThrowReferenceError(js, "Error creating renderer: %s",SDL_GetError());
    SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_BLEND);
    return SDL_Renderer2js(js, r);
)

CELL_USE_INIT(
    SDL_Init(SDL_INIT_VIDEO);
    JSValue renderer_ctor = QJSCLASSPREP_FUNCS_CTOR(SDL_Renderer,1);
    QJSCLASSPREP_NO_FUNCS(SDL_Texture)

    return renderer_ctor;
)