Added rendering

src/CMakeLists.txt

@@ -20,6 +20,6 @@ target_link_libraries(ComplexPlotting
 	glfw
 )
 
-#add_custom_command(TARGET ComplexPlotting POST_BUILD
-#	COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/src/shaders $<TARGET_FILE_DIR:ComplexPlotting>/shaders
-#)
+add_custom_command(TARGET ComplexPlotting POST_BUILD
+	COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_SOURCE_DIR}/src/shader $<TARGET_FILE_DIR:ComplexPlotting>/shaders
+)

src/PlotWindow.cpp

@@ -2,9 +2,21 @@
 
 #include <iostream>
 #include <string>
+#include <fstream>
 
 PlotWindow::PlotWindow(int w, int h, int id, std::string title) :
-	window(nullptr), id(id)
+	window(nullptr), id(id), 
+	vertices{
+		-0.5f,  0.5f, 0.0f,
+		 0.5f,  0.5f, 0.0f,
+		 0.5f, -0.5f, 0.0f,
+		-0.5f, -0.5f, 0.0f
+	}, 
+	indices{
+		0, 1, 3,
+		1, 2, 3
+	},
+	vert(0), frag(0), shader(0), VAO(0), VBO(0), EBO(0)
 {
 	window = glfwCreateWindow(w, h, ("Plot " + std::to_string(id) + " | " + title).c_str(), NULL, NULL);
 	if (window == nullptr)
@@ -27,10 +39,95 @@ PlotWindow::PlotWindow(int w, int h, int id, std::string title) :
 	}
 
 	glViewport(0, 0, w, h);
+
+	int success;
+	char errorBuf[512];
+
+	// Load and compile Vertex Shader
+	vert = glCreateShader(GL_VERTEX_SHADER);
+	char* shaderSource = nullptr;
+	LoadShaderSourceCode("shaders/basic.vert", &shaderSource);
+	if (shaderSource == nullptr)
+		shaderSource = "";
+
+	glShaderSource(vert, 1, &shaderSource, NULL);
+	glCompileShader(vert);
+	glGetShaderiv(vert, GL_COMPILE_STATUS, &success);
+	if (!success)
+	{
+		glGetShaderInfoLog(vert, 512, NULL, errorBuf);
+		std::cerr << "Vertex shader compilation error" << std::endl << errorBuf << std::endl;
+		glfwSetWindowShouldClose(window, 1);
+		return;
+	}
+
+	// load and compile Fragment Shader
+	frag = glCreateShader(GL_FRAGMENT_SHADER);
+	shaderSource = nullptr;
+	LoadShaderSourceCode("shaders/basic.frag", &shaderSource);
+	if (shaderSource == nullptr)
+		shaderSource = "";
+
+	glShaderSource(frag, 1, &shaderSource, NULL);
+	glCompileShader(frag);
+	glGetShaderiv(frag, GL_COMPILE_STATUS, &success);
+	if (!success)
+	{
+		glGetShaderInfoLog(frag, 512, NULL, errorBuf);
+		std::cerr << "Fragment shader compilation error" << std::endl << errorBuf << std::endl;
+		glfwSetWindowShouldClose(window, 1);
+		return;
+	}
+
+	// Link shaders into shader program
+	shader = glCreateProgram();
+	glAttachShader(shader, vert);
+	glAttachShader(shader, frag);
+	glLinkProgram(shader);
+	glGetProgramiv(shader, GL_LINK_STATUS, &success);
+	if (!success)
+	{
+		glGetProgramInfoLog(shader, 512, NULL, errorBuf);
+		std::cerr << "Shader program linking error" << std::endl << errorBuf << std::endl;
+		glfwSetWindowShouldClose(window, 1);
+		return;
+	}
+
+	glDeleteShader(frag);
+	glDeleteShader(vert);
+
+	// Generate buffers
+	glGenVertexArrays(1, &VAO);
+	glGenBuffers(1, &VBO);
+	glGenBuffers(1, &EBO);
+
+	glBindVertexArray(VAO);
+
+	// Create VBO
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+	// Create EBO
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+	glEnableVertexAttribArray(0);
+
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
 }
 
 void PlotWindow::Destroy()
 {
+	glfwMakeContextCurrent(window);
+
+	glDeleteBuffers(1, &EBO);
+	glDeleteBuffers(1, &VBO);
+	glDeleteVertexArrays(1, &VAO);
+
+	glDeleteProgram(shader);
+
 	glfwDestroyWindow(window);
 }
 
@@ -41,16 +138,42 @@ void PlotWindow::GiveContext()
 
 void PlotWindow::Clear()
 {
-	glClearColor(0.6f, 0.1f, 0.4f, 1.0f);
+	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 	glClear(GL_COLOR_BUFFER_BIT);
 }
 
 void PlotWindow::Display()
 {
+	glUseProgram(shader);
+
+	glBindVertexArray(VAO);
+	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
 	glfwSwapBuffers(window);
 }
 
 void PlotWindow::FramebufferSizeCallback(GLFWwindow* window, int w, int h)
 {
+	glfwMakeContextCurrent(window);
 	glViewport(0, 0, w, h);
 }
+
+void PlotWindow::LoadShaderSourceCode(const char* path, char** buffer)
+{
+	std::ifstream file(path);
+	if (!file.good())
+	{
+		std::cerr << "File not found: " << path << std::endl;
+		*buffer = nullptr;
+		return;
+	}
+
+	std::string code((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
+	size_t len = code.size();
+	*buffer = (char*)malloc(len + sizeof(char));
+	if (*buffer == nullptr)
+		return;
+	
+	memcpy_s(*buffer, len, code.c_str(), len);
+	(*buffer)[len] = '\0';
+}

src/PlotWindow.hpp

@@ -7,6 +7,10 @@
 
 #pragma once
 
+typedef unsigned int BufferObject;
+typedef unsigned int Shader;
+typedef unsigned int ShaderProgram;
+
 class PlotWindow
 {
 public:
@@ -24,4 +28,12 @@ private:
 	GLFWwindow* window;
 
 	static void FramebufferSizeCallback(GLFWwindow* window, int w, int h);
+	static void LoadShaderSourceCode(const char* path, char** buffer);
+
+	Shader vert, frag;
+	ShaderProgram shader;
+	BufferObject VAO, VBO, EBO;
+
+	float			vertices[4 * 3];
+	unsigned int	indices[2 * 3];
 };

src/shader/basic.frag

@@ -0,0 +1,8 @@
+#version 460 core
+
+out vec4 oColor;
+
+void main()
+{
+	oColor = vec4(0.6f, 0.2f, 0.9f, 1.0f);
+}

src/shader/basic.vert

@@ -0,0 +1,8 @@
+#version 460 core
+
+layout (location = 0) in vec3 aPos;
+
+void main()
+{
+	gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+}