// GFX 存在的意义是什么？
// 每一次想要draw pixel，都需要传入GOP的各种参数，
// 加入 GFX 后，GOP 的context就是全局的，可以直接用
// 而不用显示传递参数到draw的函数里

#include <graphics/context.h>

gfx_context g_gfx;
draw_target g_draw_target;

void gfx_init(EFI_GRAPHICS_OUTPUT_PROTOCOL *GOP) {
    g_gfx.GOP = GOP;
    g_gfx.hr = GOP->Mode->Info->HorizontalResolution;
    g_gfx.vr = GOP->Mode->Info->VerticalResolution;
    g_gfx.base = (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) GOP->Mode->FrameBufferBase;

    g_draw_target.buf = g_gfx.base;
    g_draw_target.w = g_gfx.hr;
    g_draw_target.h = g_gfx.vr;
}

void gfx_clear(void) {
    EFI_GRAPHICS_OUTPUT_BLT_PIXEL black = {0, 0, 0, 0};
    uefi_call_wrapper(g_gfx.GOP->Blt, 10,
        g_gfx.GOP, &black, EfiBltVideoFill,
        (UINTN)0, (UINTN)0, (UINTN)0, (UINTN)0,
        (UINTN)g_gfx.hr, (UINTN)g_gfx.vr, (UINTN)0);
}

void draw_set_target(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *buf, SUINT32 w, SUINT32 h) {
    g_draw_target.buf = buf;
    g_draw_target.w = w;
    g_draw_target.h = h;
}

void draw_set_default_target(void) {
    g_draw_target.buf = g_gfx.base;
    g_draw_target.w = g_gfx.hr;
    g_draw_target.h = g_gfx.vr;
}