HW01. Fractal. Gromov Pavel

.gitignore

@@ -30,3 +30,9 @@
 *.exe
 *.out
 *.app
+
+# Custom
+bindings/*
+build/*
+.idea/*
+cmake-build-debug/*

CMakeLists.txt

@@ -0,0 +1,65 @@
+cmake_minimum_required(VERSION 3.0)
+project(OpenGL-Fractal CXX)
+
+set(CMAKE_PREFIX_PATH ${CMAKE_BINARY_DIR})
+set(CMAKE_MODULE_PATH ${CMAKE_BINARY_DIR})
+
+# CONFIG option is important so that CMake doesnt search for modules into the default modules directory
+find_package(imgui CONFIG)
+find_package(glfw CONFIG)
+find_package(glew CONFIG)
+find_package(fmt CONFIG)
+find_package(glm CONFIG)
+
+add_executable(
+        OpenGL-Fractal
+
+        src/main.cpp
+        src/opengl_shader.cpp
+
+        bindings/imgui_impl_glfw.cpp
+        bindings/imgui_impl_opengl3.cpp
+
+        lib/stb_image.cpp
+
+        assets/simple-shader.vs
+        assets/simple-shader.fs
+)
+
+add_custom_command(
+        TARGET OpenGL-Fractal
+        POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_SOURCE_DIR}/assets/simple-shader.vs ${PROJECT_BINARY_DIR}
+        COMMAND ${CMAKE_COMMAND} -E copy ${PROJECT_SOURCE_DIR}/assets/simple-shader.fs ${PROJECT_BINARY_DIR}
+        COMMAND ${CMAKE_COMMAND} -E copy_directory ${PROJECT_SOURCE_DIR}/resources ${PROJECT_BINARY_DIR}/resources
+)
+
+target_compile_definitions(
+        OpenGL-Fractal
+        PUBLIC
+        IMGUI_IMPL_OPENGL_LOADER_GLEW
+)
+
+target_link_libraries(
+        OpenGL-Fractal
+        imgui::imgui
+        GLEW::glew_s
+        glfw::glfw
+        fmt::fmt
+        glm::glm
+)
+
+install(
+        FILES
+        ${PROJECT_SOURCE_DIR}/assets/simple-shader.vs
+        ${PROJECT_SOURCE_DIR}/assets/simple-shader.fs
+
+        DESTINATION ${PROJECT_BINARY_DIR}
+)
+
+install(
+        DIRECTORY
+        ${PROJECT_SOURCE_DIR}/resources
+
+        DESTINATION ${PROJECT_BINARY_DIR}
+)

README.md

@@ -1 +1,22 @@
-# ComputerGraphics-OpenGL
+# Фрактал
+### Условие
+Задача состоит в отрисовке фрактала (Мандельброт, Жюлия, любого другого на ваш выбор) с вычислением цвета на фрагментном шейдере.
+
+Требования к приложению:
+- поддержать возможность зума и навигации (mouse scroll, mouse drag), точка под курсором не должна съезжать (так сделана навигация в картографических приложениях, например, google maps, yandex maps, ...)
+- возможность задавать на слайдерах количество итераций, пороговые значения, ...
+- цветную отрисовку необходимо реализовать через передачу 1d текстуры на фрагментный шейдер
+
+## Запуск 
+Собираем проект:
+1) Windows `build.bat` 
+2) Linux `build.sh`
+
+Далее запускаем `build/OpenGL-Fractal`
+
+## Примеры
+![](screenshots/Example-1.gif)
+![](screenshots/Example-2.gif)
+![](screenshots/Example-3.gif)
+![](screenshots/Fractal.png)
+![](screenshots/Fractal-2.png)

assets/simple-shader.fs

@@ -0,0 +1,51 @@
+#version 330 core
+
+out vec4 o_frag_color;
+
+struct vx_output_t
+{
+    vec3 color;
+    vec3 pos;
+};
+in vx_output_t v_out;
+
+
+// Variables
+uniform int u_max_iterations;
+uniform float u_radius;
+uniform float u_zoom;
+uniform vec2 u_offset;
+uniform vec2 u_resolution;
+uniform vec2 u_shift_zoom;
+uniform vec2 u_complex;
+uniform sampler1D u_texture1D;
+// ^^^ Variables
+
+
+int mandelbrot(vec2 point);
+vec2 complex_number_product(vec2 point);
+
+int mandelbrot(vec2 point) {
+    int iterations = 0;
+    while (length(point) < u_radius && iterations < u_max_iterations) {
+        point = complex_number_product(point) + u_complex;
+        ++iterations;
+    }
+
+    return iterations;
+}
+
+vec2 complex_number_product(vec2 point) {
+    return vec2(
+        point.x * point.x - point.y * point.y,
+        point.x * point.y + point.y * point.x
+    );
+}
+
+void main() {
+    vec2 point = u_zoom * v_out.pos.xy + u_offset;
+    int iterations = mandelbrot(point);
+
+    float coord = float(iterations) / float(u_max_iterations);
+    o_frag_color = texture(u_texture1D, coord);
+}

assets/simple-shader.vs

@@ -0,0 +1,17 @@
+#version 330 core
+
+layout (location = 0) in vec3 in_position;
+layout (location = 1) in vec3 in_color;
+
+struct vx_output_t {
+    vec3 color;
+    vec3 pos;
+};
+out vx_output_t v_out;
+
+void main() {
+    v_out.color = in_color;
+    v_out.pos = in_position;
+
+    gl_Position = vec4(in_position.x, in_position.y, in_position.z, 1.0);
+}

build.bat

@@ -0,0 +1,9 @@
+@ECHO ON
+
+RMDIR /Q /S build
+MKDIR build
+PUSHD build
+
+conan install ..
+cmake .. -G "Visual Studio 15 2017 Win64"
+cmake --build . --config Release --target install

build.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -e
+set -x
+
+rm -rf build
+mkdir build
+pushd build
+
+export CONAN_SYSREQUIRES_MODE=enabled
+conan install ..
+cmake .. -DCMAKE_BUILD_TYPE=Release
+cmake --build . --target install

conanfile.txt

@@ -0,0 +1,19 @@
+[requires]
+imgui/1.74
+glfw/3.3.2
+glew/2.1.0
+fmt/7.0.3
+glm/0.9.9.8
+
+[generators]
+cmake_find_package_multi
+
+[options]
+glew:shared=False
+fmt:header_only=True
+
+[imports]
+./res/bindings, imgui_impl_glfw.cpp -> ../bindings
+./res/bindings, imgui_impl_opengl3.cpp -> ../bindings
+./res/bindings, imgui_impl_glfw.h -> ../bindings
+./res/bindings, imgui_impl_opengl3.h -> ../bindings

lib/stb_image.cpp

@@ -0,0 +1,2 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"