tiling effect using original texture size

config.json

@@ -17,7 +17,8 @@
         "print-frame-length-history": ["CTRL", "SHIFT", "h"],
         "toggle-camera": ["CTRL", "c"],
         "toggle-item": ["CTRL", "i"],
-        "effect": ["CTRL", "e"]
+        "effect": ["CTRL", "e"],
+        "tile": ["CTRL", "t"]
     },
     "recording":
     {
@@ -72,5 +73,9 @@
         "layer-count": 12,
         "y-range": [-0.6, 0.6],
         "gradient-position": 0.25
+    },
+    "resource":
+    {
+        "tile-path": "resource/tile"
     }
 }

src/Item.hpp

@@ -19,6 +19,7 @@
 #include <functional>
 #include <SDL.h>
 #include <extension.hpp>
+#include "json/json.hpp"
 #include "Node.hpp"
 
 class Item : public Node
@@ -26,6 +27,7 @@ class Item : public Node
     
 private:
     
+    nlohmann::json json = {};
     std::vector<std::shared_ptr<GLuint>> image_textures;
     std::string brand_name = "", product_name = "", upc = "";
     int current_image_index = 0;

src/Pudding.cpp

@@ -38,6 +38,7 @@ Pudding::Pudding()
                       pudding["y-range"][0], pudding["y-range"][1], pudding["gradient-position"]);
     /* use gl context so we can draw 3D */
     load_gl_context();
+    load_tiles();
 }
 
 /* Assign vertices, colors and texture UV coordinates to the pudding model */
@@ -160,18 +161,6 @@ void Pudding::load_gl_context()
     {
         log("could not create capture frame thread context");
     }
-    /* load background as surface, generate texture to load pixel data into, allocate storage, bind and edit texture properties */
-    std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> surface(IMG_Load("local/tptile.jpg"), SDL_FreeSurface);
-    std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> flipped_surface(rotozoomSurfaceXY(surface.get(), 0, 1, -1, 0), SDL_FreeSurface);
-    glGenTextures(1, &background_texture_id);
-    glBindTexture(GL_TEXTURE_2D, background_texture_id);
-    glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGB8, flipped_surface->w, flipped_surface->h);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, flipped_surface->w, flipped_surface->h, GL_RGBA, GL_UNSIGNED_BYTE, flipped_surface->pixels);
-    std::ostringstream message;
-    message << "loaded background image " << flipped_surface->w << "x" << flipped_surface->h;
-    log(message.str());
     /* Allocate a vertex array object, bind it as current, doesn't need to be a member var because the same one is always bound */
     GLuint vao;
     glGenVertexArrays(1, &vao);
@@ -225,6 +214,8 @@ void Pudding::load_gl_context()
     glBindAttribLocation(flat_program, 1, "vertex_uv");
     link_shader(flat_program);
     flat_texture_uniform_location = glGetUniformLocation(flat_program, "base_texture");
+    flat_time_uniform_location = glGetUniformLocation(flat_program, "time");
+    scroll_uniform_location = glGetUniformLocation(flat_program, "scroll");
     /* load, configure and link the 3D world program */
     vertex_shader = load_shader("src/mvp.vert", GL_VERTEX_SHADER);
     fragment_shader = load_shader("src/mvp.frag", GL_FRAGMENT_SHADER);
@@ -243,6 +234,30 @@ void Pudding::load_gl_context()
     log_gl_errors();
 }
 
+/* Read every resource/tile/.*.jpg into a GL texture, storing the texture pointer and file name in a std::map */
+void Pudding::load_tiles()
+{
+    for (fs::path path : sb::glob(get_configuration()["resource"]["tile-path"].get<fs::path>() / ".*.jpg"))
+    {
+        /* load background as surface */
+        std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> surface(IMG_Load(path.c_str()), SDL_FreeSurface);
+        std::unique_ptr<SDL_Surface, decltype(&SDL_FreeSurface)> flipped_surface(rotozoomSurfaceXY(surface.get(), 0, 1, -1, 0), SDL_FreeSurface);
+        /* generate a GL texture, allocate space and set properties */
+        std::shared_ptr<GLuint> texture_id(new GLuint, Pudding::destroy_texture);
+        glGenTextures(1, texture_id.get());
+        glBindTexture(GL_TEXTURE_2D, *texture_id);
+        glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGB8, flipped_surface->w, flipped_surface->h);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, flipped_surface->w, flipped_surface->h, GL_RGBA, GL_UNSIGNED_BYTE, flipped_surface->pixels);
+        log_gl_errors();
+        std::ostringstream message;
+        message << "loaded background image " << path.stem() << " from " << path << "(" << flipped_surface->w << "x" << flipped_surface->h << ")";
+        log(message.str());
+        tiles.push_back(texture_id);
+    }
+}
+
 /* Try to create cv::VideoCapture object using device ID #0. If successful, this will create GL texture IDs and storage
  * for the camera frames, so it must be called after GL context has been created. Two textures will be created, so they
  * can be used as a double buffer.
@@ -319,6 +334,10 @@ void Pudding::respond(SDL_Event& event)
         glUseProgram(mvp_program);
         glUniform1i(effect_uniform_location, effect_id);
     }
+    else if (get_delegate().compare(event, "tile"))
+    {
+        current_tile_index = ++current_tile_index % tiles.size();
+    }
 }
 
 /* Build an Item object by submitting the upc parameter to multiple APIs and taking
@@ -720,6 +739,8 @@ int Pudding::capture_frame(void* game)
 /* Update parameters and draw the screen */
 void Pudding::update()
 {
+    /* number of seconds we've been running for */
+    float time_seconds = SDL_GetTicks() / 1000.0f;
     /* launch the camera capture thread if it is not currently running */
     if (capture.isOpened() && !reading_capture_frame)
     {
@@ -755,6 +776,7 @@ void Pudding::update()
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     /* switch to flat shader for background */
     glUseProgram(flat_program);
+    glUniform1f(flat_time_uniform_location, time_seconds);
     /* disable pudding attributes and enable rectangle attributes */
     glDisableVertexAttribArray(2);
     glDisableVertexAttribArray(3);
@@ -762,16 +784,17 @@ void Pudding::update()
     glEnableVertexAttribArray(1);
     glUniform1i(flat_texture_uniform_location, 0);
     glActiveTexture(GL_TEXTURE0);
-    glBindTexture(GL_TEXTURE_2D, background_texture_id);
+    glBindTexture(GL_TEXTURE_2D, *tiles[current_tile_index]);
     /* set blend to modify white part of background, color passed is in HSV format */
     GLint blend_min_hsv_location = glGetUniformLocation(flat_program, "blend_min_hsv");
-    /* blend min with black will create a black blackground regardless of texture */
-    glUniform3f(blend_min_hsv_location, 0, 0, 0);
+    glUniform3f(blend_min_hsv_location, 0.0f, 0.0f, 1.0f);
+    glUniform1i(scroll_uniform_location, true);
     /* draws rectangle vertices and rectangle texture using UV coords */
     glDrawArrays(GL_TRIANGLES, 0, 6);
+    glUniform1i(scroll_uniform_location, false);
     /* draw pudding model using MVP shader */
     glUseProgram(mvp_program);
-    glUniform1f(time_uniform_location, SDL_GetTicks() / 1000.0f);
+    glUniform1f(time_uniform_location, time_seconds);
     /* calculate the transformation matrix for displaying pudding in viewport */
     model = glm::rotate(model, weight(get_configuration()["pudding"]["rotation-speed"].get<float>()), Y_UNIT_NORMAL_3D);
     projection = glm::perspective(

src/Pudding.hpp

@@ -61,20 +61,24 @@ private:
     const glm::vec3 PUDDING_YELLOW = glm::vec3(0.878f, 0.859f, 0.122f);
     std::string current_barcode, previous_barcode, current_config_barcode, current_camera_barcode;
     std::vector<Item> items;
-    int current_item_index = 0, effect_id = EFFECT_NONE, pudding_triangle_vertex_count = 0, pudding_fan_vertex_count = 0;
+    int current_item_index = 0, effect_id = EFFECT_NONE, pudding_triangle_vertex_count = 0, pudding_fan_vertex_count = 0,
+        current_tile_index = 0;
     cv::VideoCapture capture;
     zbar::ImageScanner image_scanner;
     GLuint flat_program, mvp_program, capture_texture_front_buffer_id, capture_texture_back_buffer_id, capture_texture_id,
-        mvp_uniform_location, background_texture_id, time_uniform_location, effect_uniform_location, uv_transformation_uniform_location,
-        flat_texture_uniform_location, coordinate_bound_uniform_location;
+        mvp_uniform_location, time_uniform_location, effect_uniform_location, uv_transformation_uniform_location,
+        flat_texture_uniform_location, coordinate_bound_uniform_location, flat_time_uniform_location,
+        scroll_uniform_location;
     glm::mat4 projection, model = glm::mat4(1.0f), mvp;
     std::vector<glm::vec3> pudding_vertices, pudding_colors;
     std::vector<glm::vec2> pudding_uv;
     bool show_item = false, reading_capture_frame = false;
     SDL_GLContext capture_frame_thread_context = nullptr;
+    std::vector<std::shared_ptr<GLuint>> tiles;
 
     void set_pudding_model(float, float, int, int = 1, float = -1, float = 1, float = 0.3f);
     void load_gl_context();
+    void load_tiles();
     void initialize_camera();
     void incorporate_open_food_api(Item&);
     void incorporate_nutronix_api(Item&);

src/flat.frag

@@ -3,6 +3,8 @@
 in vec2 uv;
 uniform sampler2D base_texture;
 uniform vec3 blend_min_hsv;
+uniform float time;
+uniform bool scroll = false;
 
 /* from http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl, licensed under WTFPL */
 vec3 hsv2rgb(vec3 c)
@@ -14,6 +16,15 @@ vec3 hsv2rgb(vec3 c)
 
 void main(void)
 {
-    gl_FragColor = texture(base_texture, uv);
+    if (scroll)
+    {
+        ivec2 texture_size = textureSize(base_texture, 0);
+        float speed = time * 35.0;
+        gl_FragColor = texelFetch(base_texture, ivec2(mod(vec2(gl_FragCoord.x + speed, gl_FragCoord.y - speed), texture_size)), 0);
+    }
+    else
+    {
+        gl_FragColor = texture(base_texture, uv);
+    }
     gl_FragColor = min(gl_FragColor, vec4(hsv2rgb(blend_min_hsv), 1));
 }

src/white.frag

@@ -1,9 +0,0 @@
-#version 130
-
-in vec3 ex_Color;
-in float x;
-
-void main(void)
-{
-    gl_FragColor = vec4(1, 1, 1, 1);
-}