/*
* glview sample
Written by T.Aikawa. 2021/01/08
*/

#include "glview.h"

int static size = 26;

static void redraw(glvWindow glv_win)
{
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glvFont_SetStyle(GLV_FONT_NAME_NORMAL,size,0.0f,0,GLV_FONT_NAME | GLV_FONT_NOMAL | GLV_FONT_SIZE | GLV_FONT_LEFT);
glvFont_setColorRGBA(255, 0, 0,255);
glvFont_SetBkgdColorRGBA(255,255,255,255);
glvFont_SetPosition(0,0);

glvFont_printf("%s","ABC");

glvReqSwapBuffers(glv_win);
}

static int window_init(glvWindow glv_win,int width, int height)
{
glvGl_init(); // openglを使用するための初期化処理
glvWindow_setViewport(glv_win,width,height);

return(GLV_OK);
}

static int window_reshape(glvWindow glv_win,int width, int height)
{
size = (width>height)?(height*0.8):(width*0.4); // 描画する文字フォントのサイズ

glvWindow_setViewport(glv_win,width,height);
redraw(glv_win);

return(GLV_OK);
}


static int window_redraw(glvWindow glv_win,int drawStat)
{
redraw(glv_win);
return(GLV_OK);
}

static const struct glv_window_listener _window_listener = {
.init = window_init,
.reshape = window_reshape,
.redraw = window_redraw,
};
const struct glv_window_listener *window_listener = &_window_listener;

glvWindow main_window = NULL;

int main_frame_start(glvWindow frame_window,int width, int height)
{
// 描画用のウインドウを作成する
glvCreateWindow(frame_window,window_listener,&main_window,"window",0, 0, width, height,GLV_WINDOW_ATTR_DEFAULT);
glvOnReDraw(main_window); // 描画要求
return(GLV_OK);
}

static const struct glv_frame_listener _frame_window_listener = {
.start = main_frame_start, // フレーム作成時、最初に呼び出される
};
static const struct glv_frame_listener *frame_window_listener = &_frame_window_listener;

int main(int argc, char *argv[])
{
glvDisplay glv_dpy;
glvWindow frame_window = NULL;

glv_dpy = glvOpenDisplay(NULL);
if(!glv_dpy){
fprintf(stderr,"Error: glvOpenDisplay() failed\n");
return(-1);
}

// フレームを作成する
glvCreateFrameWindow(glv_dpy,frame_window_listener,&frame_window,"frame","sample 001",400, 550);

/* ----------------------------------------------------------------------------------------------- */
glvEnterEventLoop(glv_dpy); // event loop
/* ----------------------------------------------------------------------------------------------- */

// 終了処理
glvDestroyWindow(&main_window);
glvDestroyWindow(&frame_window);
glvCloseDisplay(glv_dpy);

printf("all terminated.\n");

return(0);
}