Hi Werner,
I doubt these five lines kill your framerate. Fixed pipeline on modern
graphics boards these days is implemented internally on shaders and must do
the same. There must be something else in your vertex shader approach that
goes wrong...
Wojtek
--------------------------------------------------
From: "Werner Modenbach" <[email protected]>
Sent: Monday, September 13, 2010 4:15 PM
To: "OpenSceneGraph Users" <[email protected]>
Subject: Re: [osg-users] Texture coordinate calculation in vertex shader
Hi Wojtek,
thanks for your reply.
I have instantly studied the orange book. According to the book I have to
use
something like:
vec4 tmp = gl_ModelViewMatrix * gl_Vertex;
ShadowTexcoord.s = dot(tmp, gl_EyePlaneS[1]);
ShadowTexcoord.t = dot(tmp, gl_EyePlaneT[1]);
ShadowTexcoord.p = dot(tmp, gl_EyePlaneR[1]);
ShadowTexcoord.q = dot(tmp, gl_EyePlaneQ[1]);
But unfortunately this kills performance inacceptably and also rendering
of my
scene is not stable (flickering). Shadow appear as expected.
On Monday 13 September 2010 13:51:02 Wojciech Lewandowski wrote:
Hi Werener,
See VertexShader in StandardShadowMap. OpenGL Shading Languege (Orange
Book) contains a chapter on emulating fixed pipeline. And you may also
try
to use 3DLabs ShaderGen.
Wojtek Lewandowski
--------------------------------------------------
From: "Werner Modenbach" <[email protected]>
Sent: Monday, September 13, 2010 12:00 PM
To: <[email protected]>
Subject: [osg-users] Texture coordinate calculation in vertex shader
> Hi everybody!
>
> I'm using osgShadow::ShadowMap on my scene.
> Also I have written my own vertex and fragment shaders.
> When coming to apply the shadow effect in the fragment shader I have to
> access
> the shadow map.
> The original shader uses just
> shadow2DProj( osgShadow_shadowTexture, gl_TexCoord[1] )
> to access the texture. Obviously gl_TexCoord[1] is calculated by the
> standard
> gl pipeline shader.
> Any quick hint, how I have to do the calculation in my vertex shader?
>
> Many thanks in advance
>
> - Werner -
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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