added image widget with atlas support and global texture manager

data/layout.xml

@@ -34,12 +34,24 @@
         </border>
         <separator width="10"/>
         <border width="50" margin="0 5 0 0" color=".1" thickness="2" border-color=".5" justify="center" align="center"><text text="red" font-face="arial" font-size="11" color="1 0 0 1"/></border>
-        <border width="50" margin="0 5 0 0" color=".2" thickness="2" border-color=".5" justify="center" align="center"><text text="blue" font-face="arial" font-size="11" color="0 0 1 1"/></border>
+        <border width="50" margin="0 5 0 0" color=".2" thickness="2" border-color=".5" justify="center" align="center"><text text="blue" font-face="arial" font-size="11" color=".4 .4 1 1"/></border>
         <border width="50" margin="0 5 0 0" color=".3" thickness="2" border-color=".5" justify="center" align="center"><text text="green" font-face="arial" font-size="11" color="0 1 0 1"/></border>
         <separator width="10"/>
-        <border width="50" margin="0 5 0 0" color=".1" thickness="2" border-color=".7"></border>
-        <border width="50" margin="0 5 0 0" color=".2" thickness="2" border-color=".7"></border>
-        <border width="50" margin="0 5 0 0" color=".3" thickness="2" border-color=".7"></border>
+        <border width="50" margin="0 5 0 0" color=".1" thickness="2" border-color=".7" pad="4">
+          <image path="data/uvs.jpg" region="0 0 50 50" width="100%" height="100%" align="center" justify="flex-end">
+            <text text="atlas" font-face="arial" font-size="11"/>
+          </image>
+        </border>
+        <border width="70" margin="0 5 0 0" color=".2" thickness="2" border-color=".7">
+          <image path="data/social.png" region="0 0 230 230" width="100%" height="100%" pad="5" align="center" justify="flex-end">
+            <text text="Facebook" font-face="arial" font-size="11"/>
+          </image>
+        </border>
+        <border width="50" margin="0 5 0 0" color=".3" thickness="2" border-color=".7">
+          <image path="data/social.png" region="250 0 480 230" width="100%" height="100%" pad="5" align="center" justify="flex-end">
+            <text text="Twitter" font-face="arial" font-size="11"/>
+          </image>
+        </border>
         <separator width="10"/>
         <border width="50" margin="0 5 0 0"></border>
         <border width="50" margin="0 5 0 0"></border>
@@ -66,11 +78,13 @@
         <node width="1" grow="1" height="100%" pad="10" wrap="1" dir="col" justify="center" align="center">
           <text text="hello widget" font-face="arial" font-size="30" color="0 1 1 1"/>
           <text text="this is a small description of the useless big text above" font-face="arial" font-size="11" color="0 1 1 1"/>
+          <image margin="10 0 0 0" path="data/uvs.jpg" width="100" height="100"/>
         </node>
       </node>
       <!-- status bar -->
       <border height="30" width="100%" color=".15" border-color=".3" dir="row" pad="0 0 0 10" align="center">
         <text text="Status Bar: nothing to show here." font-face="arial" font-size="11"/>
+        <text text="#fuckunity #fromscratch" font-face="arial" font-size="11" margin="0 0 0 10" color=".2 .5 1 1"/>
       </border>
     </node>
   </layout>

engine/app.cpp

@@ -38,6 +38,26 @@ void App::init()
         "void main(){"
         "   frag = vec4(uv.xy,0,1);"
         "}";
+    static const char* shader_atlas_v =
+        "#version 150\n"
+        "uniform mat4 mvp;"
+        "uniform vec2 tof;"
+        "uniform vec2 tsz;"
+        "in vec2 pos;"
+        "in vec2 uvs;"
+        "out vec2 uv;"
+        "void main(){"
+        "   uv = tof + uvs * tsz;"
+        "   gl_Position = mvp * vec4(pos, 0, 1);"
+        "}";
+    static const char* shader_atlas_f =
+        "#version 150\n"
+        "uniform sampler2D tex;"
+        "in vec2 uv;"
+        "out vec4 frag;"
+        "void main(){"
+        "   frag = texture(tex, uv);"
+        "}";
     static const char* shader_color_v =
         "#version 150\n"
         "uniform mat4 mvp;"
@@ -99,7 +119,7 @@ void App::init()
     const char* ttf = "/Library/Fonts/Arial.ttf";
 #endif
     FontManager::init();
-    FontManager::load(kFont::Arial_11, ttf, 13);
+    FontManager::load(kFont::Arial_11, ttf, 15);
     FontManager::load(kFont::Arial_30, ttf, 30);
 
     layout.load("data/layout.xml");
@@ -110,7 +130,9 @@ void App::init()
     ShaderManager::create(kShader::Color, shader_color_v, shader_color_f);
     ShaderManager::create(kShader::UVs, shader_v, shader_uv_f);
     ShaderManager::create(kShader::Font, shader_font_v, shader_font_f);
-    WidgetBorder::m_plane.create<1>(1, 1);
+    ShaderManager::create(kShader::Atlas, shader_atlas_v, shader_atlas_f);
+    WidgetBorder::init();
+    WidgetImage::init();
 
     if (!tex.load("data/uvs.jpg"))
         printf("error loading image\n");

engine/image.cpp

@@ -5,7 +5,7 @@
 
 bool Image::load(std::string filename)
 {
-    stbi_set_flip_vertically_on_load(true);
+    //stbi_set_flip_vertically_on_load(true);
     uint8_t* buffer = stbi_load(filename.c_str(), &width, &height, nullptr, 4);
     comp = 4;
     m_data = std::unique_ptr<uint8_t[]>(buffer);

engine/layout.cpp

@@ -3,6 +3,8 @@
 #include "util.h"
 
 Plane WidgetBorder::m_plane;
+Plane WidgetImage::m_plane;
+Sampler WidgetImage::m_sampler;
 
 void Node::update(float width, float height)
 {
@@ -221,6 +223,9 @@ void Node::load_internal(const tinyxml2::XMLElement* x_node)
     case kWidget::Text:
         m_widget = std::make_unique<WidgetText>();
         break;
+    case kWidget::Image:
+        m_widget = std::make_unique<WidgetImage>();
+        break;
     }
     
     while (attr)

engine/layout.h

@@ -31,6 +31,8 @@ enum class kAttribute : uint16_t
     FontSize    = const_hash("font-size"),
     Justify     = const_hash("justify"),
     Align       = const_hash("align"),
+    Path        = const_hash("path"),
+    Region      = const_hash("region"),
 };
 
 enum class kWidget : uint16_t
@@ -38,6 +40,7 @@ enum class kWidget : uint16_t
     Border = const_hash("border"),
     Shape  = const_hash("shape"),
     Text   = const_hash("text"),
+    Image  = const_hash("image"),
     Ref    = const_hash("ref"),
 };
 
@@ -80,6 +83,10 @@ public:
     glm::vec4 m_color;
     glm::vec4 m_border_color;
     float m_thinkness{ 1 };
+    static void init()
+    {
+        m_plane.create<1>(1, 1);
+    }
     virtual std::unique_ptr<Widget> clone() override
     {
         auto ret = std::make_unique<WidgetBorder>();
@@ -281,6 +288,82 @@ public:
     }
 };
 
+class WidgetImage : public Widget
+{
+public:
+    static Plane m_plane;
+    static Sampler m_sampler;
+    bool m_use_atlas;
+    glm::vec4 m_region;
+    glm::vec2 m_off;
+    glm::vec2 m_sz;
+    std::string m_path;
+    uint16_t m_id;
+    static void init()
+    {
+        m_plane.create<1>(1, 1);
+        m_sampler.create();
+    }
+    virtual std::unique_ptr<Widget> clone() override
+    {
+        auto ret = std::make_unique<WidgetImage>();
+        *ret = *this;
+        return std::move(ret);
+    }
+    virtual void create() override
+    {
+        if (TextureManager::load(m_path.c_str()))
+        {
+            auto tex_sz = TextureManager::get(m_id).size();
+            m_off = m_region.xy / tex_sz;
+            m_sz = (m_region.zw - m_region.xy) / tex_sz;
+        }
+    }
+    virtual void draw() override
+    {
+        TextureManager::get(m_id).bind();
+        m_sampler.bind(0);
+        if (m_use_atlas)
+        {
+            ShaderManager::use(kShader::Atlas);
+            ShaderManager::u_vec2(kShaderUniform::Tof, m_off);
+            ShaderManager::u_vec2(kShaderUniform::Tsz, m_sz);
+        }
+        else
+        {
+            ShaderManager::use(kShader::Texture);
+        }
+        ShaderManager::u_int(kShaderUniform::Tex, 0);
+        ShaderManager::u_mat4(kShaderUniform::MVP, mvp);
+        m_plane.draw_fill();
+        m_sampler.unbind();
+        TextureManager::get(m_id).unbind();
+    }
+    virtual void parse_attributes(kAttribute id, const tinyxml2::XMLAttribute* attr) override
+    {
+        switch (id)
+        {
+        case kAttribute::Path:
+            m_path = attr->Value();
+            m_id = const_hash(attr->Value());
+            break;
+        case kAttribute::Region:
+        {
+            glm::vec4 v;
+            int n = sscanf(attr->Value(), "%f %f %f %f", &v.x, &v.y, &v.z, &v.w);
+            if (n == 4)
+            {
+                m_region = v;
+                m_use_atlas = true;
+            }
+            break;
+        }
+        default:
+            break;
+        }
+    }
+};
+
 class Node
 {
     friend class LayoutManager;

engine/shader.h

@@ -6,8 +6,8 @@ enum class kShaderUniform : uint16_t
     MVP = const_hash("mvp"),
     Tex = const_hash("tex"),
     Col = const_hash("col"),
-    Tof = const_hash("texoff"),
-    Tsz = const_hash("texsz"),
+    Tof = const_hash("tof"),
+    Tsz = const_hash("tsz"),
 };
 
 class Shader
@@ -29,6 +29,7 @@ enum class kShader : uint16_t
     Texture     = const_hash("texture"),
     UVs         = const_hash("uvs"),
     Font        = const_hash("font"),
+    Atlas       = const_hash("atlas"),
 };
 
 class ShaderManager

engine/texture.cpp

@@ -1,6 +1,24 @@
 #include "pch.h"
 #include "texture.h"
 #include "image.h"
+#include "util.h"
+
+std::map<uint16_t, Texture2D> TextureManager::m_textures;
+
+bool TextureManager::load(const char* path)
+{
+    uint16_t id = const_hash(path);
+    if (m_textures.count(id) == 0 || !m_textures[id].ready())
+    {
+        return m_textures[id].load(path);
+    }
+    return true;
+}
+
+Texture2D& TextureManager::get(uint16_t id)
+{
+    return m_textures[id];
+}
 
 bool Texture2D::create(int width, int height, GLint format, const uint8_t* data)
 {
@@ -31,6 +49,11 @@ void Texture2D::update(const uint8_t* data)
     glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_width, m_height, m_format, GL_UNSIGNED_BYTE, data);
 }
 
+glm::vec2 Texture2D::size() const
+{
+    return { m_width, m_height };
+}
+
 bool Sampler::create(GLint filter /*= GL_LINEAR*/, GLint wrap /*= GL_CLAMP_TO_EDGE*/)
 {
     glGenSamplers(1, &id);
@@ -55,3 +78,4 @@ void Sampler::unbind()
 {
     glBindSampler(current_unit, 0);
 }
+

engine/texture.h

@@ -15,6 +15,7 @@ public:
     void unbind() const { glBindTexture(GL_TEXTURE_2D, 0); }
     void update(const uint8_t* data);
     bool ready() const { return m_tex != 0; }
+    glm::vec2 size() const;
 };
 
 class Sampler
@@ -28,3 +29,11 @@ public:
     void unbind();
     bool ready() const { return id != 0; }
 };
+
+class TextureManager
+{
+public:
+    static std::map<uint16_t, Texture2D> m_textures;
+    static bool load(const char* path);
+    static Texture2D& get(uint16_t id);
+};