Tom's HDR Rendering Demo...

[savage]

Tom Nuydens has been quiet for quite some time, but he's back and now with a great new HDR demo...
<blockquote>

I wrote a demo that does high dynamic range (HDR) rendering. It uses the EXT_framebuffer_object extension for its render-to-texture operations. The demo renders a scene into a floating point buffer, using a simple lighting model and some shadow mapping. The HDR portion of the image is then run through a separable gaussian blur filter and composited back onto the LDR portion, resulting in a fashionable-looking glow effect. You can get the demo right here. As usual, it may or may not run on anything other than a GeForce 6x00

</blockquote>
For a screen shot of the HDR effect visit Tom's Home Page : http://www.delphi3d.net/

[Sly]

You've got two links in that news post. One to Tom's email address (with anti-spam stuff), and the other direct to the zip file of the demo. You should also provide a link to his webpage, as he often puts screenshots of the demos on the front page of his site.

[savage]

Done.

[tux]

wont work on ati cards?

[JSoftware]

nope.. requires sm3.0 it has branches in it..

[Clootie]

This code can be compiled on HW without branches support (given enought instruction slots):

void main(void)
{
  vec4 color;

  // This test is there to kill reverse projections from the spotlights:
  if (tc_shadow.z > gl_DepthRange.near)
  {
    // Attenutation:
    float a = 1.0 - clamp(length(L)/75.0, 0.0, 1.0);
    // Diffuse:
    vec4 I = max(dot(normalize(N), normalize(L)), 0.0) * brightness;
    // Sample the spotlight "gel" texture and the shadow map:
    vec4 gel = texture2DProj(t_gel, tc_shadow);
    vec4 s = shadow2DProj(t_shadow, tc_shadow);
    // Final shaded color:
    color = a * Kd * I * gel * s;
  }
  else
  {
    // Fragments behind the projector are black.
    color = vec4(0.0, 0.0, 0.0, 1.0);
  }

  // We write the LDR and HDR portions of the image to separate images.
  // LDR is the [0, 1] part:
  gl_FragData[0] = min(color, 1.0);
  // HDR is everything that's > 1:
  gl_FragData[1] = max(color - 1.0, 0.0);
}

Main reason why Tom's demo is not running on ATI cards - is the lack of support of EXT_framebuffer_object extension. But it's rather new and people just have to wait for ATI to release new drivers (not sure maybe Cat 5.6 already supports it?)

[JSoftware]

hmm at closer thought i must agree with you, clootie..

[Traveler]

As usual, it may or may not run on anything other than a GeForce 6x00

Odd,.. while all demos are working nicely, this one is a no go for my 6800gt too :cry:

[Clootie]

Traveler: Just download newest [unofficial] drivers

[Traveler]

I did try the newest, but not the unofficial version.
I'll try though, thanks!