panda3d/samples/glow-filter/shaders/glowShader.sha

//Cg
//

void vshader(float4 vtx_position : POSITION, 
             float2 vtx_texcoord0 : TEXCOORD0,
             uniform float4x4 mat_modelproj,
	     out float4 l_position : POSITION,
	     out float2 l_texcoord0 : TEXCOORD0)
{
	l_position=mul(mat_modelproj, vtx_position);
	l_texcoord0=vtx_texcoord0;
}

void fshader(float2 l_texcoord0 : TEXCOORD0,
       	     uniform sampler2D tex_0 : TEXUNIT0,
	     out float4 o_color : COLOR)
{
	float4 texColor=tex2D(tex_0, l_texcoord0);
	o_color=texColor*2*(texColor.w - 0.5);
}