initial commit.

mybox.cpp

@@ -0,0 +1,146 @@
+
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <iostream>
+#include <cassert>
+
+#include "src/standard_ints.h"
+#include "src/lgl_callbacks.h"
+#include "src/lgl_shader_tools.h"
+
+int main(void) {
+
+	std::cout << "Hello World." << std::endl;
+
+	// Setup GLFW context
+	glfwInit();
+
+	// Establish 4.2 GL requirement
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+	// Build the winodw
+	GLFWwindow *window = glfwCreateWindow(960, 400, 
+		"Hello MyBox", NULL, NULL);
+	if (window == NULL) {
+		std::cout << "Failed to create GLFW window." << std::endl;
+		glfwTerminate();
+		return -1;
+	}
+
+	glfwMakeContextCurrent(window);
+	// Set the resize callback;
+	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+	// Setup the glad loader
+	if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
+		std::cout << "Failed to initalize GLAD." << std::endl;
+		return -1;
+	}
+
+	i32 success;
+	char infoLog[512];
+
+	// Create the vertex shader
+	char *shdr_src_vertex = readshader("vertex.glsl");
+	u32 vertexShader = glCreateShader(GL_VERTEX_SHADER);
+	glShaderSource(vertexShader, 1, &shdr_src_vertex, NULL);
+	glCompileShader(vertexShader);
+	glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
+	freeshader(shdr_src_vertex);
+	if (!success) {
+		glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
+		std::cout << "ERROR SHADER::VERTEX::Compilation Failed\n" << 
+			infoLog << std::endl;
+		return -1;
+	}
+
+	// Create the fragment shader
+	char *shdr_src_fragment = readshader("fragment.glsl");
+	u32 fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
+	glShaderSource(fragmentShader, 1, &shdr_src_fragment, NULL);
+	glCompileShader(fragmentShader);
+	glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
+	freeshader(shdr_src_fragment);
+	if (!success) {
+		glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
+		std::cout << "ERROR SHADER::FRAGMENT::Compilation Failed\n" << 
+			infoLog << std::endl;
+		return -1;
+	}
+
+	// Create the shader program
+	u32 shaderProgram = glCreateProgram();
+	glAttachShader(shaderProgram, vertexShader);
+	glAttachShader(shaderProgram, fragmentShader);
+	glLinkProgram(shaderProgram);
+
+	glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
+	if (!success) {
+		glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
+		std::cout << "ERROR SHADER::PROGRAM::Linking Failed\n" << 
+			infoLog << std::endl;
+		return -1;
+	}
+
+	// Free the old shader bits
+	glDeleteShader(vertexShader);
+	glDeleteShader(fragmentShader);
+
+	// Define the vertex shader dat.
+	f32 vertices[] = {
+		 0.5f,  0.5f, 0.0f,	// tr
+		 0.5f, -0.5f, 0.0f,	// br
+		-0.5f, -0.5f, 0.0f,	// bl
+		-0.5f,  0.5f, 0.0f 	// tl
+	};
+	u32 indicies[] {
+		0, 1, 3,	// t1
+		1, 2, 3		// t2
+	};
+
+	u32 EBO;
+	u32 VBO;
+	u32 VAO;
+	glGenBuffers(1, &EBO);
+	glGenBuffers(1, &VBO);
+	glGenVertexArrays(1, &VAO);
+	
+	// Bind VAO
+	glBindVertexArray(VAO);
+	// copy in data to the VBO
+	glBindBuffer(GL_ARRAY_BUFFER, VBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	// Setup the indexing into the VBO data
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indicies), indicies, GL_STATIC_DRAW);
+	// Target the Atrib pointer in the VAO to the VBO inside it.
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(f32), (void *)0);
+	// STart at Zero
+	glEnableVertexAttribArray(0);
+
+	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	// ??
+
+	while(!glfwWindowShouldClose(window)) {
+		processInput(window);
+		
+		// Do some rendering
+		glClearColor(0.0f, 0.1f, 0.3f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT);
+
+		glUseProgram(shaderProgram);
+		glBindVertexArray(VAO);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+
+		// Finish up
+		glfwSwapBuffers(window);
+		glfwPollEvents();
+	}
+
+	glfwTerminate();
+	return 0;
+}