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Useful Functions.md

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#configuring

  • glfwInit()
  • glfwWindowHint(int hint, int value)
  • GLFW_CONTEXT_VERSION_(MAJOR/MINOR) - sets glfw version #window_creation
  • GLFWwindow object
  • glfwCreateWindow(int width, int height, const char* title, GLFWmonitor* monitor, GLFWwindow* share)
    • monitor is the monitor to use for full screen mode, NULL = windowed mode
    • share is the window whose context to share resources with, NULL to not share resources
  • glfwMakeContextCurrent(GLFWwindow* window)
    • make the context of the specified window current for the calling thread
  • glViewPort(GLint x, GLint y, GLsizei width, GLsizei height)
    • specifies the render window
    • x: left x-coordinate of the viewport rectangle
    • y: bottom y-coordinate of the viewport rectangle

#render_loop see [[render loop]]

  • glfwWindowShouldClose(GLFWwindow* window)
    • checks if the window has been instructed to close
  • glfwSwapBuffers(GLFWwindow* window)
    • swap the color buffer and show the output on screen. see [[Double Buffering]]
  • glfwPollEvents()
    • checks for events such as keyboard inputs

#input

  • glfwGetKey(GLFWwindow *window, int key)
    • returns GLFW_PRESS or GLFW_RELEASE

#buffers

  • glGenBuffers(GLsizei size, GLuint* buffers)
    • generate a vertex buffer object
    • size = number of buffer objects to generate
    • buffer = array where glGenBuffers will store its resulting buffer reference IDs
  • glBindBuffer(GLenum target, GLuint buffer)
    • binds a buffer object to the current buffer type target
    • target - target buffer object, most common are GL_ARRAY_BUFFER and GL_ELEMENT_ARRAY_BUFFER
    • buffer - the buffer object's reference ID of the buffer you want to bind
  • glBufferData(GLenum mode, GLsizeiptr size, const GLvoid* data, GLenum usage)
    • Copy user-defined data into the currently bound buffer
    • mode - target buffer we want to copy into
    • size - size of the data we want to pass into the buffer
    • data - pointer to data that will be copied. NULL if you want to just allocate empty memory
    • usage - specifies the expected usage pattern of the data
      • Most common are GL_STATIC_DRAW, GL_DYNAMIC_DRAW, GL_STREAM_DRAW