Hi Guys,
I've am quite new in using osg. I've got a problem when i try to attach
fragment shader to my scene.
Here is the shader source:
uniform sampler2DShadow shadow;
void main()
{
vec4 tmp = shadow2D(shadow, gl_FragCoord.stp);
if (tmp.x - gl_FragCoord.z <= 0.0)
gl_FragColor = gl_Color;
else
discard;
}
And the following is the error got from the info log:
Fragment info
-------------
Internal error: assembly compile error for fragment shader at offset 658:
-- error message --
line 22, column 13: error: variable not valid as a source register
-- internal assembly text --
!!ARBfp1.0
OPTION NV_fragment_program2;
# cgc version 1.6.0000, build date Jun 1 2006 17:44:39
# command line args:
#vendor NVIDIA Corporation
#version 1.6.0.0
#profile fp40
#program main
#semantic shadow
#var float4 gl_Color : $vin.COLOR0 : COL0 : -1 : 1
#var float4 gl_FragCoord : $vin.WPOS : WPOS : -1 : 1
#var float4 gl_FragColor : $vout.COLOR : COL : -1 : 1
#var sampler2DSHADOW shadow : : texunit 0 : -1 : 1
#var <none>4 $kill_0000 : $vout.$kill : $kill : -1 : 0
PARAM c[1] = { program.local[0] };
TEMP R0;
TEMP RC;
TEMP HC;
OUTPUT oCol = result.color;
TEX R0.x, fragment.position, texture[0], 2D;
SLERC HC.x, R0, fragment.position.z;
MOVR oCol, oCol;
MOVR oCol(GT.x), fragment.color.primary;
KIL EQ.x;
END
# 5 instructions, 1 R-regs, 0 H-regs
thanks.
Cheers,
Andy
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