Cheap critters contours

Contour_Default.glsl

//
// Cheap critters contours
// Wipe/cirn0
//

#version 110

#ifdef VERTEX_SHADER
uniform mat4 ProjectionMatrix;

attribute vec2 InPosition;
attribute vec4 InColor;
attribute vec2 InTexCoord;
attribute vec2 InTexEggCoord;

varying vec4 Color;
varying vec2 TexCoord;
varying vec2 TexEggCoord;

void main( void )
{
	gl_Position = ProjectionMatrix * vec4( InPosition, 0.0, 1.0 );
	Color = InColor;
	TexCoord = InTexCoord;
	TexEggCoord = InTexEggCoord;
}
#endif

#ifdef FRAGMENT_SHADER
uniform sampler2D ColorMap;
uniform sampler2D EggMap;

varying vec4 Color;
varying vec2 TexCoord;
varying vec2 TexEggCoord;

void main( void )
{
	vec4 texColor = texture2D( ColorMap, TexCoord );
	gl_FragColor = Color;

	if( TexEggCoord.x != 0.0 )
		gl_FragColor.a = texture2D( EggMap, TexEggCoord ).a;
	else
		gl_FragColor.a = texColor.a - 0.4;
}
#endif