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Image noise: Difference between revisions
→{{header|Nim}}
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=={{header|Nim}}==
==Using OpenGL ===
{{trans|C}}
{{libheader|OpenGL}}
<lang Nim>import times
import opengl
import opengl/glut
const
W = 320
H = 240
SLen = W * H div sizeof(int)
var
frame = 0
bits: array[SLen, uint]
last, start: Time
#---------------------------------------------------------------------------------------------------
proc render() {.cdecl.} =
## Render the window.
var r = bits[0] + 1
for i in countdown(bits.high, 0):
r *= 1103515245
bits[i] = r xor bits[i] shr 16
glClear(GL_COLOR_BUFFER_BIT)
glBitmap(W, H, 0, 0, 0, 0, cast[ptr GLubyte](bits.addr))
glFlush()
inc frame
if (frame and 15) == 0:
let t = getTime()
if t > last:
last = t
echo "fps: ", frame.float / (t - start).inSeconds.float
#---------------------------------------------------------------------------------------------------
proc initGfx(argc: ptr cint; argv: pointer) =
## Initialize OpenGL rendering.
glutInit(argc, argv)
glutInitDisplayMode(GLUT_RGB)
glutInitWindowSize(W, H)
glutIdleFunc(render)
discard glutCreateWindow("Noise")
glutDisplayFunc(render)
loadExtensions()
#———————————————————————————————————————————————————————————————————————————————————————————————————
var argc: cint = 0
initGfx(addr(argc), nil)
start = getTime()
last = start
glutMainLoop()</lang>
===Using library "Rapid"===
{{libheader|rapid}}
Unfortunately, these examples no longer work for some reason.
Naive implementation:
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