panopainter/engine/node_canvas.cpp

#include "pch.h"
#include "log.h"
#include "node_canvas.h"

Node* NodeCanvas::clone_instantiate() const
{
    return new NodeCanvas();
}

void NodeCanvas::init()
{
    m_mouse_ignore = false;
    m_canvas = std::make_unique<ui::Canvas>();
    m_canvas->create(1024, 1024);
    m_sampler.create(GL_NEAREST);
    m_face_plane.create<1>(2, 2);
    m_line.create();
    CanvasMode::node = this;
    CanvasMode::canvas = m_canvas.get();
    for (int i = 0; i < (int)ui::Canvas::kCanvasMode::COUNT; i++)
        for (auto m : ui::Canvas::modes[i])
            m->init();
}

void NodeCanvas::restore_context()
{
    Node::restore_context();
    m_canvas->create(1024, 1024);
    m_sampler.create(GL_NEAREST);
    m_face_plane.create<1>(2, 2);
    m_canvas->snapshot_restore();
    CanvasMode::node = this;
    CanvasMode::canvas = m_canvas.get();
    for (int i = 0; i < (int)ui::Canvas::kCanvasMode::COUNT; i++)
        for (auto m : ui::Canvas::modes[i])
            m->init();
}

void NodeCanvas::clear_context()
{
    Node::clear_context();
    m_canvas->snapshot_save(data_path);
    m_canvas->clear_context();
    // TODO: clear CanvasMode objects
}

void NodeCanvas::draw()
{
    using namespace ui;
    GLint vp[4];
    GLfloat cc[4];
    glGetIntegerv(GL_VIEWPORT, vp);
    glGetFloatv(GL_COLOR_CLEAR_VALUE, cc);

    glClearColor(0, 0, 0, 1);
    glClear(GL_COLOR_BUFFER_BIT);
    float zoom = root()->m_zoom;
    auto box = m_clip * zoom;
    glm::ivec4 c = (glm::ivec4)glm::vec4(box.x, (int)(vp[3] - box.y - box.w), box.z, box.w);
    glViewport(c.x, c.y, c.z, c.w);

    //m_canvas->m_cam_rot = m_pan * 0.003f;

    glm::mat4 ortho_proj = glm::ortho(0.f, box.z, 0.f, box.w, -1000.f, 1000.f);
    glm::mat4 proj = glm::perspective(glm::radians(m_canvas->m_cam_fov), box.z / box.w, 0.1f, 1000.f);
    glm::mat4 camera = glm::eulerAngleXY(m_canvas->m_cam_rot.y, m_canvas->m_cam_rot.x) *
        glm::translate(m_canvas->m_cam_pos);

    m_canvas->m_mv = camera;
    m_canvas->m_proj = proj;
    m_canvas->m_box = box;

    //         auto plane_mvp = proj * camera * transform *
    //             glm::scale(glm::vec3(sz, 1));


    m_sampler.bind(0);
    auto blend = glIsEnabled(GL_BLEND);

    glEnable(GL_BLEND);
    //glEnable(GL_DEPTH_TEST);
    glClear(GL_DEPTH_BUFFER_BIT);
    for (int plane_index = 0; plane_index < 6; plane_index++)
    {
        auto plane_mvp = proj * camera * glm::scale(glm::vec3(m_canvas->m_order.size())) * m_canvas->m_plane_transform[plane_index] * glm::translate(glm::vec3(0, 0, -1));

        ui::ShaderManager::use(kShader::Checkerboard);
        ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp);
        m_face_plane.draw_fill();

        ui::ShaderManager::use(kShader::TextureAlpha);
        ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
        for (auto layer_index : m_canvas->m_order)
        {
            if (m_canvas->m_layers[layer_index].m_opacity == .0f)
                continue;
            int z = m_canvas->m_order.size() - layer_index;
            auto plane_mvp_z = proj * camera * glm::scale(glm::vec3(z)) * m_canvas->m_plane_transform[plane_index] * glm::translate(glm::vec3(0, 0, -1));
            ui::ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp_z);
            if (!(m_canvas->m_state == ui::Canvas::kCanvasMode::Erase &&
                m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index))
            {
                ui::ShaderManager::u_float(kShaderUniform::Alpha, m_canvas->m_layers[layer_index].m_opacity);
                m_canvas->m_layers[layer_index].m_rtt[plane_index].bindTexture();
                m_face_plane.draw_fill();
                m_canvas->m_layers[layer_index].m_rtt[plane_index].unbindTexture();
            }
            if (m_canvas->m_show_tmp && m_canvas->m_current_layer_idx == layer_index)
            {
                ui::ShaderManager::u_float(kShaderUniform::Alpha,
                    m_canvas->m_current_stroke->m_brush.m_tip_opacity * m_canvas->m_layers[layer_index].m_opacity);
                m_canvas->m_tmp[plane_index].bindTexture();
                m_face_plane.draw_fill();
                m_canvas->m_tmp[plane_index].unbindTexture();
            }
        }
    }
    glDisable(GL_DEPTH_TEST);

    for (auto& mode : *m_canvas->m_mode)
        mode->on_Draw(ortho_proj, proj, camera);

    // keep drawing the grids
    if (m_canvas->m_state != ui::Canvas::kCanvasMode::Grid)
        for (auto& mode : ui::Canvas::modes[(int)ui::Canvas::kCanvasMode::Grid])
            mode->on_Draw(ortho_proj, proj, camera);

    //ui::ShaderManager::use(kShader::Equirect);
    //ui::ShaderManager::u_mat4(kShaderUniform::MVP, glm::scale(glm::vec3(.5, .5, 1)));
    //ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
    //glBindTexture(GL_TEXTURE_CUBE_MAP, m_canvas->cube_id);
    //m_face_plane.draw_fill();
    //glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

//         ui::ShaderManager::use(kShader::Color);
//         ui::ShaderManager::u_mat4(kShaderUniform::MVP, proj * camera);
//         ui::ShaderManager::u_vec4(kShaderUniform::Col, { 1, 0, 0, 1 });
//         static glm::vec4 AB[4]{ {-.75, 0, -1, 1},{ -.75, 0, 1, 1 } };
//         m_line.update_vertices(AB);
//         m_line.draw_stroke();

    blend ? glEnable(GL_BLEND) : glDisable(GL_BLEND);
    m_sampler.unbind();
    glViewport(vp[0], vp[1], vp[2], vp[3]);
    glClearColor(cc[0], cc[1], cc[2], cc[3]);
}

void NodeCanvas::handle_resize(glm::vec2 old_size, glm::vec2 new_size)
{
    if (new_size.x > m_canvas->m_width)
    {
        //             m_canvas->resize((int)new_size.x, (int)new_size.y);
        //             m_canvas->clear();
    }
}

kEventResult NodeCanvas::handle_event(Event* e)
{
    Node::handle_event(e);
    MouseEvent* me = static_cast<MouseEvent*>(e);
    KeyEvent* ke = static_cast<KeyEvent*>(e);
    GestureEvent* ge = static_cast<GestureEvent*>(e);
    auto loc = (me->m_pos - m_pos) * root()->m_zoom;

    switch (e->m_type)
    {
    case kEventType::MouseScroll:
    case kEventType::MouseDownL:
    case kEventType::MouseUpL:
    case kEventType::MouseDownR:
    case kEventType::MouseUpR:
    case kEventType::MouseMove:
    case kEventType::MouseCancel:
        for (auto& mode : *m_canvas->m_mode)
            mode->on_MouseEvent(me, loc);
        break;
    case kEventType::KeyDown:
        //             if (ke->m_key == kKey::KeyE)
        //                 m_canvas->m_state = ui::Canvas::kPenState::Erase;
        //             if (ke->m_key == kKey::KeySpacebar)
        //                 m_canvas->m_alpha_lock = true;
        //             if (ke->m_key == kKey::AndroidVolumeUp)
        //                 m_zoom_canvas *= 0.9f;
        //             if (ke->m_key == kKey::AndroidVolumeDown)
        //                 m_zoom_canvas *= 1.1f;
        if (ke->m_key == kKey::AndroidBack)
            if (!ActionManager::empty())
                ActionManager::undo();
        break;
    case kEventType::KeyUp:
        //             if (ke->m_key == kKey::KeyE)
        //                 m_canvas->m_state = ui::Canvas::kPenState::Draw;
        //             if (ke->m_key == kKey::KeySpacebar)
        //                 m_canvas->m_alpha_lock = false;
        break;
    case kEventType::GestureStart:
    case kEventType::GestureMove:
        for (auto& mode : *m_canvas->m_mode)
            mode->on_GestureEvent(ge);
        break;
    default:
        return kEventResult::Available;
        break;
    }
    return kEventResult::Consumed;
}