i commit

1 files changed, 260 insertions, 0 deletions

diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..2d4ecce
--- /dev/null
+++ b/main.cpp
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+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image.h>
+
+#include <shader.h>
+#include "Canvas.h"
+#include "point.h"
+
+#include <iostream>
+#include <cmath>
+#include <vector>
+
+void framebuffer_size_callback(GLFWwindow* window, int width, int height);
+void processInput(GLFWwindow *window);
+
+void loadTexture(std::string path, unsigned int* texture, int* width, int* height);
+void generateCanvasTexture(unsigned int *texture, unsigned char color);
+
+// settings
+const unsigned int SCR_WIDTH = 800;
+const unsigned int SCR_HEIGHT = 600;
+const std::string PROJECT_PATH = "/home/saintruler/CLionProjects/opengltest/";
+unsigned char* canvas = (unsigned char*) malloc(SCR_HEIGHT * SCR_WIDTH * 3);
+
+std::vector<point> points;
+const double c = 1e5;
+
+int main()
+{
+    // glfw: initialize and configure
+    // ------------------------------
+    glfwInit();
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+    // glfw window creation
+    // --------------------
+    GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
+    if (window == NULL)
+    {
+        std::cout << "Failed to create GLFW window" << std::endl;
+        glfwTerminate();
+        return -1;
+    }
+    glfwMakeContextCurrent(window);
+    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+    // glad: load all OpenGL function pointers
+    // ---------------------------------------
+    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+    {
+        std::cout << "Failed to initialize GLAD" << std::endl;
+        return -1;
+    }
+
+    // build and compile our shader zprogram
+    // ------------------------------------
+    Shader ourShader((PROJECT_PATH + "4.1.texture.vs").c_str(), (PROJECT_PATH + "4.1.texture.fs").c_str());
+
+    // set up vertex data (and buffer(s)) and configure vertex attributes
+    // ------------------------------------------------------------------
+    float vertices1[] = {
+            // positions          // colors           // texture coords
+            0.5f,  0.5f, 0.0f,    1.0f, 0.0f, 0.0f,   1.0f, 1.0f, // top right
+            0.5f, -0.5f, 0.0f,    0.0f, 1.0f, 0.0f,   1.0f, 0.0f, // bottom right
+            -0.5f, -0.5f, 0.0f,   0.0f, 0.0f, 1.0f,   0.0f, 0.0f, // bottom left
+            -0.5f,  0.5f, 0.0f,   1.0f, 1.0f, 0.0f,   0.0f, 1.0f  // top left
+    };
+
+    float vertices[] = {
+            // positions        // colors           // texture coords
+            1.f,  1.f, 0.0f,    1.0f, 0.0f, 0.0f,   1.0f, 1.0f, // top right
+            1.f, -1.f, 0.0f,    0.0f, 1.0f, 0.0f,   1.0f, 0.0f, // bottom right
+            -1.f, -1.f, 0.0f,   0.0f, 0.0f, 1.0f,   0.0f, 0.0f, // bottom left
+            -1.f,  1.f, 0.0f,   1.0f, 1.0f, 0.0f,   0.0f, 1.0f  // top left
+    };
+    unsigned int indices[] = {
+            0, 1, 3, // first triangle
+            1, 2, 3  // second triangle
+    };
+    unsigned int VBO, VAO, EBO;
+    glGenVertexArrays(1, &VAO);
+    glGenBuffers(1, &VBO);
+    glGenBuffers(1, &EBO);
+
+    glBindVertexArray(VAO);
+
+    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+    // position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(0);
+    // color attribute
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
+    glEnableVertexAttribArray(1);
+    // texture coord attribute
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
+    glEnableVertexAttribArray(2);
+
+
+    // load and create a texture
+    // -------------------------
+    unsigned int texture;
+    glGenTextures(1, &texture);
+    unsigned char i = 0;
+
+    points.emplace_back(point(100, 100));
+    points.emplace_back(point(500, 500));
+    points.emplace_back(point(200, 375));
+
+
+    // render loop
+    // -----------
+    while (!glfwWindowShouldClose(window))
+    {
+        // input
+        // -----
+        processInput(window);
+
+        // render
+        // ------
+        glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        generateCanvasTexture(&texture, i++);
+        // bind Texture
+        glBindTexture(GL_TEXTURE_2D, texture);
+
+        // render container
+        ourShader.use();
+        glBindVertexArray(VAO);
+        glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
+        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
+        // -------------------------------------------------------------------------------
+        glfwSwapBuffers(window);
+        glfwPollEvents();
+    }
+
+    // optional: de-allocate all resources once they've outlived their purpose:
+    // ------------------------------------------------------------------------
+    glDeleteVertexArrays(1, &VAO);
+    glDeleteBuffers(1, &VBO);
+    glDeleteBuffers(1, &EBO);
+
+    // glfw: terminate, clearing all previously allocated GLFW resources.
+    // ------------------------------------------------------------------
+    glfwTerminate();
+    return 0;
+}
+
+
+void loadTexture(std::string path, unsigned int* texture, int* width, int* height)
+{
+    glGenTextures(1, texture);
+    glBindTexture(GL_TEXTURE_2D, *texture); // all upcoming GL_TEXTURE_2D operations now have effect on this texture object
+    // set the texture wrapping parameters
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	// set texture wrapping to GL_REPEAT (default wrapping method)
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    // set texture filtering parameters
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    // load image, create texture and generate mipmaps
+    int nrChannels;
+    unsigned char* data = stbi_load(path.c_str(), width, height, &nrChannels, 0);
+
+    if (data)
+    {
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, *width, *height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+        glGenerateMipmap(GL_TEXTURE_2D);
+    }
+    else
+    {
+        std::cout << "Failed to load texture" << std::endl;
+    }
+    stbi_image_free(data);
+}
+
+
+void generateCanvasTexture(unsigned int *texture, unsigned char color)
+{
+    glBindTexture(GL_TEXTURE_2D, *texture); // all upcoming GL_TEXTURE_2D operations now have effect on this texture object
+    // set the texture wrapping parameters
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	// set texture wrapping to GL_REPEAT (default wrapping method)
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    // set texture filtering parameters
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    // load image, create texture and generate mipmaps
+
+
+    for (int x = 0; x < SCR_WIDTH; x++)
+    {
+        for (int y = 0; y < SCR_HEIGHT; y++)
+        {
+
+            point canvas_pt(x, y);
+            double f = 0;
+            for (point pt : points)
+            {
+                point path = pt - canvas_pt;
+
+                f += (c * 20 * 1) / path.length_sqared();
+            }
+
+            int l = (int) f;
+            if (l > 255) l = 255;
+
+
+            canvas[y * SCR_WIDTH * 3 + x * 3 + 0] = l;
+            canvas[y * SCR_WIDTH * 3 + x * 3 + 1] = 0;
+            canvas[y * SCR_WIDTH * 3 + x * 3 + 2] = 0;
+        }
+    }
+
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGB, GL_UNSIGNED_BYTE, (unsigned char*) canvas);
+    glGenerateMipmap(GL_TEXTURE_2D);
+}
+
+
+// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
+// ---------------------------------------------------------------------------------------------------------
+void processInput(GLFWwindow *window)
+{
+    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+        glfwSetWindowShouldClose(window, true);
+
+    if (glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS)
+        points[0].x -= 20;
+    if (glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS)
+        points[0].x += 20;
+
+    if (glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS)
+        points[0].y -= 20;
+    if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS)
+        points[0].y += 20;
+
+    double xpos, ypos;
+    //getting cursor position
+    glfwGetCursorPos(window, &xpos, &ypos);
+    points[0].x = xpos;
+    points[0].y = SCR_HEIGHT - ypos;
+}
+
+// glfw: whenever the window size changed (by OS or user resize) this callback function executes
+// ---------------------------------------------------------------------------------------------
+void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+    // make sure the viewport matches the new window dimensions; note that width and
+    // height will be significantly larger than specified on retina displays.
+    glViewport(0, 0, width, height);
+}
+