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content/opengl/triangle.md

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----
-title: OpenGL - Triangle
----
-# OpenGL: Triangle
-
-The following code depends on the ``opengl`` and ``nim-glfw`` packages which
-can be installed via babel by executing ``babel install opengl@#head nim-glfw@#head``.
-You will need the GLFW DLL in order to run this on Windows.
-
-![Triangle Windows](https://nim-by-example.github.io/images/triangle.png)
-
-One thing to keep in mind when writing OpenGL code in Nim is that ``float``
-is actually ``float64``. But vertices must be ``float32`` so you must explicitly
-specify that by casting or using ``'f32`` as is done in the example.
-
-```nimrod
-import os, glfw/glfw, opengl, times, math
-
-proc assertShader(shader: GLuint) =
-  var status: GLint
-  glGetShaderiv(shader, GL_COMPILE_STATUS, addr status)
-  if status != GL_TRUE:
-    var buff: array[512, char]
-    glGetShaderInfoLog(shader, 512, nil, buff)
-    echo(buff)
-    assert false
-
-const 
-  vertexSource = """
-#version 150
-
-in vec2 position;
-in vec3 color;
-
-out vec3 Color;
-
-void main()
-{
-    Color = color;
-    gl_Position = vec4(position, 0.0, 1.0);
-}
-"""
-  fragmentSource = """
-#version 150
-
-in vec3 Color;
-
-out vec4 outColor;
-
-void main()
-{
-    outColor = vec4(Color, 1.0);
-}
-"""
-
-
-proc setup(shaderProgram: var TGLUint) =
-  var vertices = [
-     0.0'f32, 0.5, 1, 0, 0,
-     0.5,    -0.5, 0, 1, 0,
-    -0.5,    -0.5, 0, 0, 1
-  ]
-  echo(vertices.repr)
-  var vertexBuffer: GLuint
-  glGenBuffers(1, addr vertexBuffer)
-  echo("Verter Buff: ", vertexBuffer)
-
-  var vertexArray: GLuint
-  glGenVertexArrays(1, addr vertexArray)
-  glBindVertexArray(vertexArray)
-  
-
-  glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer)
-  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices).int32, addr vertices,
-               GL_STATIC_DRAW)
-
-  var vertexShader = glCreateShader(GL_VERTEX_SHADER)
-  var vertexSrcArray = [vertexSource.cstring]
-  glShaderSource(vertexShader, 1, cast[cstringArray](addr vertexSrcArray), nil)
-  glCompileShader(vertexShader)
-  assertShader(vertexShader)
-
-  var fragmentShader = glCreateShader(GL_FRAGMENT_SHADER)
-  var fragmentSrcArray = [fragmentSource.cstring]
-  glShaderSource(fragmentShader, 1, cast[cstringArray](addr fragmentSrcArray),
-      nil)
-  glCompileShader(fragmentShader)
-  assertShader(fragmentShader)
-
-  shaderProgram = glCreateProgram()
-  glAttachShader(shaderProgram, vertexShader)
-  glAttachShader(shaderProgram, fragmentShader)
-
-  # Apparently this is not necessary according to http://open.gl
-  glBindFragDataLocation(shaderProgram, 0, "outColor")
-
-  glLinkProgram(shaderProgram)
-  glUseProgram(shaderProgram)
-
-  # Vertex data <-> attributes
-  var posAttrib = glGetAttribLocation(shaderProgram, "position").gluint
-  glEnableVertexAttribArray(posAttrib)
-  glVertexAttribPointer(posAttrib, 2, cGL_FLOAT, false,
-                        5*sizeof(GLFloat).int32, nil)
-
-  var colAttrib = glGetAttribLocation(shaderProgram, "color").gluint
-  glEnableVertexAttribArray(colAttrib)
-  glVertexAttribPointer(colAttrib, 3, cGL_FLOAT, false,
-                        5*sizeof(GLFloat).int32,
-                        cast[pointer](2*sizeof(GLFloat)))
-
-when isMainModule:
-  glfw.init()
-  var win = newWin()
-  win.makeContextCurrent()
-
-  loadExtensions()
-
-  var shaderProgram: TGLuint
-  setup(shaderProgram)
-
-  while not win.shouldClose:
-    glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT)
-
-    glDrawArrays(GL_TRIANGLES, 0, 3)
-    win.swapBufs()
-    
-    pollEvents()
-
-  win.destroy()
-  glfw.terminate()
-```