// MATERIAL

vertex_program snowshader_VS cg
{
    source snowshader.cg
	entry_point snowshader_vp
    profiles vs_1_1

    default_params
	{
		param_named_auto worldViewProj worldviewproj_matrix
		param_named_auto eyePosition camera_position_object_space
	}
}

fragment_program snowshader_PS cg
{
    source snowshader.cg
    entry_point snowshader_fp
    profiles ps_1_1

    default_params
        {
            param_named_auto scroll time_0_x 20
            param_named speed float 0.05
        }
}

material particle_snowflakes_shader
{
	receive_shadows off

	technique
	{
		pass
		{
			scene_blend alpha_blend
			lighting off
			fog_override true

			cull_hardware none
			cull_software none

			depth_write off

			vertex_program_ref snowshader_VS
			{
			}

			fragment_program_ref snowshader_PS
			{
			}

			texture_unit
			{
				texture particle_snowflakes3.png
			}
		}
	}
}

material particle_snowflakes_basic
{
	receive_shadows off

	technique
	{
		pass
		{
			scene_blend alpha_blend
			lighting off
			fog_override true

			cull_hardware none
			cull_software none

			depth_write off

			texture_unit
			{
				texture particle_snowflakes3.png
				scroll_anim 0.1 0.7
			}
		}
	}
}

// CG

void snowshader_vp(

float4 in_POSITION  	: POSITION,
float2 in_UV0    		: TEXCOORD0,
float3 in_COLOR			: COLOR,

out float4 out_POSITION : POSITION,
out float2 out_UV0      : TEXCOORD0,
out float4 out_COLOR	: COLOR,

uniform float4x4 	worldViewProj,
uniform float4		eyePosition
)

{
    out_POSITION = mul(worldViewProj, in_POSITION);
	out_UV0 = in_UV0;

	float A = max(0, 1-((distance(eyePosition, in_POSITION)-6000)/2000));
	out_COLOR = float4(in_COLOR, A);
}

void snowshader_fp(

float2 fp_in_UV0        	: TEXCOORD0,
float4 fp_in_COLOR			: COLOR,

out float4 fp_out_COLOR   	: COLOR,

 float scroll,
 float speed,
 uniform sampler2D texture
)

{
        fp_in_UV0.y += scroll * speed;
	fp_out_COLOR = tex2D(texture, fp_in_UV0);
	/* fp_out_COLOR.a = 1; fp_in_COLOR.a; */
}