From 7b99f0510a3cbf2e9b1498eb9dc9f1fa30ce50dc Mon Sep 17 00:00:00 2001
From: omigamedev <omarator@gmail.com>
Date: Mon, 15 May 2017 00:43:37 +0100
Subject: [PATCH] added timeline slider and export animation frames

---
 data/layout.xml             |  6 +++
 engine/app_events.cpp       |  1 -
 engine/app_layout.cpp       | 25 ++++++++++-
 engine/canvas.cpp           | 84 +++++++++++++++++++++++++++++++++++--
 engine/canvas.h             |  4 +-
 engine/layout.cpp           |  6 +--
 engine/node.cpp             | 11 +++++
 engine/node.h               |  1 +
 engine/node_panel_layer.cpp |  5 +++
 engine/node_panel_layer.h   |  1 +
 10 files changed, 132 insertions(+), 12 deletions(-)

diff --git a/data/layout.xml b/data/layout.xml
index 89ae41a..3561134 100644
--- a/data/layout.xml
+++ b/data/layout.xml
@@ -393,6 +393,12 @@
             <!--<panel-color id="panel-color"/>-->
           </scroll>
         </node>
+        <!-- timeline -->
+        <node height="100%" width="1" grow="1" dir="col" justify="flex-end">
+          <border color=".3 .3 .3 .4" height="50" width="100%" pad="10">
+            <slider-h id="frames-slider"></slider-h>
+          </border>
+        </node>
       </node>
       <!-- status bar -->
       <!--<border height="30" width="100%" color=".15" border-color=".3" dir="row" pad="0 0 0 10" align="center">
diff --git a/engine/app_events.cpp b/engine/app_events.cpp
index fb9a39d..012853e 100644
--- a/engine/app_events.cpp
+++ b/engine/app_events.cpp
@@ -47,7 +47,6 @@ bool App::mouse_scroll(float x, float y, float delta)
     e.m_scroll_delta = delta * 0.1f;
     auto ret = layout[main_id]->on_event(&e);
     layout[main_id]->update();
-    LOG("wheel x %.2f y %.2f", x, y);
     return ret == kEventResult::Consumed;
 }
 bool App::mouse_cancel(int button)
diff --git a/engine/app_layout.cpp b/engine/app_layout.cpp
index 61c4eee..82af275 100644
--- a/engine/app_layout.cpp
+++ b/engine/app_layout.cpp
@@ -232,7 +232,7 @@ void App::initLayout()
             button->on_click = [this,button](Node*) {
                 if (canvas)
                 {
-                    //canvas->m_canvas->export_anim(data_path);
+                    canvas->m_canvas->export_anim(data_path);
                 }
             };
         }
@@ -368,6 +368,29 @@ void App::initLayout()
         {
             toolbar->m_flood_events = true;
         }
+        if (auto* slider = layout[main_id]->find<NodeSliderH>("frames-slider"))
+        {
+            slider->on_value_changed = [this](Node*, float value)
+            {
+                auto& c = *ui::Canvas::I;
+
+                for (int i = 0; i < c.m_layers.size(); i++)
+                {
+                    auto l = layers->get_layer_at(i);
+                    layers->handle_layer_opacity(l, .0f);
+                }
+
+                int current_layer = (int)floor(value * c.m_layers.size());
+                auto l = layers->get_layer_at(current_layer);
+                layers->handle_layer_selected(l);
+                layers->handle_layer_opacity(l, 1.f);
+                if (current_layer > 0)
+                {
+                    auto l = layers->get_layer_at(current_layer - 1);
+                    layers->handle_layer_opacity(l, .25f);
+                }
+            };
+        }
     };
     LOG("initializing layout xml");
     if (layout.m_loaded)
diff --git a/engine/canvas.cpp b/engine/canvas.cpp
index 254da8a..606c584 100644
--- a/engine/canvas.cpp
+++ b/engine/canvas.cpp
@@ -451,7 +451,6 @@ void ui::Canvas::resize(int width, int height)
     {
         l.create(width, height, "");
     }
-    m_latlong.create(width * 4, height * 2); // NOTE: w and h must be equal to make sense
 }
 bool ui::Canvas::create(int width, int height)
 {
@@ -473,7 +472,6 @@ bool ui::Canvas::create(int width, int height)
     {
         l.create(width, height, "");
     }
-    m_latlong.create(width * 4, height * 2); // NOTE: w and h must be equal to make sense
     return true;
 }
 
@@ -506,7 +504,6 @@ void ui::Canvas::clear_context()
         m_tex[i].destroy();
         m_tex2[i].destroy();
     }
-    m_latlong.destroy();
 };
 
 void ui::Canvas::export_equirectangular(std::string data_path)
@@ -522,6 +519,10 @@ void ui::Canvas::export_equirectangular(std::string data_path)
     glViewport(0, 0, m_width, m_height);
     glDisable(GL_BLEND);
 
+    RTT m_latlong;
+    m_latlong.create(m_width * 4, m_height * 2); // NOTE: w and h must be equal to make sense
+
+    GLuint cube_id;
     glGenTextures(1, &cube_id);
     glBindTexture(GL_TEXTURE_CUBE_MAP, cube_id);
     for (GLuint i = 0; i < 6; i++)
@@ -603,6 +604,83 @@ void ui::Canvas::export_equirectangular(std::string data_path)
         int ret = stbi_write_png(name, m_latlong.getWidth(), m_latlong.getHeight(), 4, latlong_data.get(), m_latlong.stride());
     }
 
+    glDeleteTextures(1, &cube_id);
+    m_latlong.destroy();
+
+    // restore viewport and clear color states
+    blend ? glEnable(GL_BLEND) : glDisable(GL_BLEND);
+    glViewport(vp[0], vp[1], vp[2], vp[3]);
+    glClearColor(cc[0], cc[1], cc[2], cc[3]);
+    glActiveTexture(GL_TEXTURE0);
+}
+
+void ui::Canvas::export_anim(std::string data_path)
+{
+    // save viewport and clear color states
+    GLint vp[4];
+    GLfloat cc[4];
+    glGetIntegerv(GL_VIEWPORT, vp);
+    glGetFloatv(GL_COLOR_CLEAR_VALUE, cc);
+    GLboolean blend = glIsEnabled(GL_BLEND);
+
+    // prepare common states
+    glViewport(0, 0, m_width, m_height);
+    glDisable(GL_BLEND);
+    glActiveTexture(GL_TEXTURE0);
+
+    RTT m_latlong;
+    m_latlong.create(m_width * 4, m_height * 2); // NOTE: w and h must be equal to make sense
+
+    GLuint cube_id;
+    glGenTextures(1, &cube_id);
+    glBindTexture(GL_TEXTURE_CUBE_MAP, cube_id);
+    for (GLuint i = 0; i < 6; i++)
+        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGBA8, m_width, m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+    int faces[]{
+        GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, // front
+        GL_TEXTURE_CUBE_MAP_NEGATIVE_X, // right
+        GL_TEXTURE_CUBE_MAP_POSITIVE_Z, // back
+        GL_TEXTURE_CUBE_MAP_POSITIVE_X, // left
+        GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, // top
+        GL_TEXTURE_CUBE_MAP_POSITIVE_Y, // bottom
+    };
+    for (auto layer_index : m_order)
+    {
+        for (int i = 0; i < 6; i++)
+        {
+            m_layers[layer_index].m_rtt[i].bindFramebuffer();
+            // copy result to cubemap
+            glBindTexture(GL_TEXTURE_CUBE_MAP, cube_id);
+            glCopyTexImage2D(faces[i], 0, GL_RGBA8, 0, 0, m_width, m_height, 0);
+            glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
+            m_layers[layer_index].m_rtt[i].unbindFramebuffer();
+        }
+
+        glViewport(0, 0, m_latlong.getWidth(), m_latlong.getHeight());
+        m_latlong.clear({ 1, 1, 1, 1 });
+        m_latlong.bindFramebuffer();
+        ui::ShaderManager::use(kShader::Equirect);
+        ui::ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
+        ui::ShaderManager::u_int(kShaderUniform::Tex, 0);
+        glBindTexture(GL_TEXTURE_CUBE_MAP, cube_id);
+        m_sampler.bind(0);
+        m_plane.draw_fill();
+        m_sampler.unbind();
+        glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
+        m_latlong.unbindFramebuffer();
+        {
+            auto latlong_data = std::make_unique<uint8_t[]>(m_latlong.bytes());
+            m_latlong.readTextureData(latlong_data.get());
+            static char name[128];
+            sprintf(name, "%s/latlong-frame%02d.png", data_path.c_str(), layer_index);
+            LOG("writing %s", name);
+            int ret = stbi_write_png(name, m_latlong.getWidth(), m_latlong.getHeight(), 4, latlong_data.get(), m_latlong.stride());
+        }
+    }
+
+    glDeleteTextures(1, &cube_id);
+    m_latlong.destroy();
+
     // restore viewport and clear color states
     blend ? glEnable(GL_BLEND) : glDisable(GL_BLEND);
     glViewport(vp[0], vp[1], vp[2], vp[3]);
diff --git a/engine/canvas.h b/engine/canvas.h
index 727f3fe..943e26a 100644
--- a/engine/canvas.h
+++ b/engine/canvas.h
@@ -89,9 +89,6 @@ public:
         I->m_state = mode;
     }
 
-    GLuint cube_id;
-    RTT m_latlong;
-
     std::vector<Layer::Snapshot> m_layers_snapshot;
 
     Canvas() { I = this; }
@@ -110,6 +107,7 @@ public:
     void snapshot_restore();
     void clear_context();
     void export_equirectangular(std::string data_path);
+    void export_anim(std::string data_path);
     void project_save(std::string data_path);
     void project_open(std::string data_path);
     ui::Image thumbnail_generate(int w, int h);
diff --git a/engine/layout.cpp b/engine/layout.cpp
index 9b54f13..1727a9f 100644
--- a/engine/layout.cpp
+++ b/engine/layout.cpp
@@ -8,10 +8,9 @@
 
 bool LayoutManager::load(const char* path)
 {
-    if (m_loaded)
-        return true; // already loaded
+//     if (m_loaded)
+//         return true; // already loaded
 
-/*
 #if !defined(__ANDROID__)
     struct stat tmp_info;
     if (stat(path, &tmp_info) != 0)
@@ -20,7 +19,6 @@ bool LayoutManager::load(const char* path)
         return false;
     m_file_info = tmp_info;
 #endif // __ANDROID__
-*/
     
     m_path = path;
 
diff --git a/engine/node.cpp b/engine/node.cpp
index 0190e3f..f25cc23 100644
--- a/engine/node.cpp
+++ b/engine/node.cpp
@@ -251,6 +251,17 @@ int Node::get_child_index(Node* n)
     return -1;
 }
 
+Node* Node::get_child_at(int index)
+{
+    auto n = YGNodeGetChild(y_node, index);
+    for (auto& c : m_children)
+    {
+        if (c->y_node == n)
+            return c.get();
+    }
+    return nullptr;
+}
+
 glm::vec4 Node::get_children_rect() const
 {
     if (m_children.empty())
diff --git a/engine/node.h b/engine/node.h
index bc18568..885427d 100644
--- a/engine/node.h
+++ b/engine/node.h
@@ -184,6 +184,7 @@ public:
     void move_child(Node* n, int index);
     void move_child_offset(Node* n, int offset);
     int get_child_index(Node* n);
+    Node* get_child_at(int index);
     glm::vec4 get_children_rect() const;
     void mouse_capture();
     void mouse_release();
diff --git a/engine/node_panel_layer.cpp b/engine/node_panel_layer.cpp
index 746306c..df1954d 100644
--- a/engine/node_panel_layer.cpp
+++ b/engine/node_panel_layer.cpp
@@ -177,6 +177,11 @@ void NodePanelLayer::add_layer()
     add_layer(s);
 }
 
+NodeLayer* NodePanelLayer::get_layer_at(int index)
+{
+    return static_cast<NodeLayer*>(m_layers_container->get_child_at(index));
+}
+
 void NodePanelLayer::remove_layer(NodeLayer* layer)
 {
     auto it = std::find(m_layers.begin(), m_layers.end(), m_current_layer);
diff --git a/engine/node_panel_layer.h b/engine/node_panel_layer.h
index b940d29..ba80bf6 100644
--- a/engine/node_panel_layer.h
+++ b/engine/node_panel_layer.h
@@ -51,6 +51,7 @@ public:
     virtual void init() override;
     void add_layer();
     void add_layer(const char* name);
+    NodeLayer* get_layer_at(int index);
     void remove_layer(NodeLayer* layer);
     void handle_layer_opacity(NodeLayer* target, float value);
     void handle_layer_visibility(NodeLayer* target, bool visible);