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/**
* @file ui.cpp
*
* Copyright (C) 2022 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ui.hpp"
#include "text.hpp"
#include <SDL2/SDL_opengl.h>
#include <iostream>
#include <string>
static const unsigned int NRE_TEX_DATA = 0xBBBBBBBB;
void UISystem::configure(entityx::EntityManager&, entityx::EventManager &events)
{
events.subscribe<HideDialog>(*this);
}
void UISystem::createDialogBox(float x, float y, float w, float h)
{
// Queue for generation in the main thread.
// TODO Should y inversion be hidden in the render system?
m_boxes.emplace_back(0, x, -y - h, w, h);
}
void UISystem::update(entityx::EntityManager&,
entityx::EventManager& events,
entityx::TimeDelta)
{
if (m_clear_boxes) {
m_clear_boxes = false;
for (const auto& b : m_boxes) {
if (b.vbo != 0) {
events.emit<DelRenderEvent>(b.vbo);
}
}
m_boxes.clear();
} else {
for (auto& b : m_boxes) {
if (b.vbo == 0) {
auto nre = generateDialogBox(b);
events.emit<NewRenderEvent>(nre);
}
}
}
}
void UISystem::receive(const HideDialog&)
{
m_clear_boxes = true;
}
NewRenderEvent UISystem::generateDialogBox(Box& box)
{
NewRenderEvent nre;
std::basic_string<TextMeshData> buffer;
glGenBuffers(1, &nre.vbo);
glGenTextures(1, &nre.tex);
box.vbo = nre.vbo;
glBindTexture(GL_TEXTURE_2D, nre.tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 1, 1, 0, GL_RGBA,
GL_UNSIGNED_BYTE, &NRE_TEX_DATA);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
buffer += { box.x, box.y, -5, 0, 0, 1 };
buffer += { box.x + box.w, box.y, -5, 0, 0, 1 };
buffer += { box.x + box.w, box.y + box.h, -5, 0, 0, 1 };
buffer += { box.x + box.w, box.y + box.h, -5, 0, 0, 1 };
buffer += { box.x, box.y + box.h, -5, 0, 0, 1 };
buffer += { box.x, box.y, -5, 0, 0, 1 };
glBindBuffer(GL_ARRAY_BUFFER, nre.vbo);
glBufferData(GL_ARRAY_BUFFER,
buffer.size() * sizeof(TextMeshData), buffer.data(),
GL_DYNAMIC_DRAW);
nre.normal = 0;
nre.vertex = buffer.size();
return nre;
}
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