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78 lines
2.1 KiB
Plaintext
78 lines
2.1 KiB
Plaintext
/*
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This file is part of Caelum.
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See http://www.ogre3d.org/wiki/index.php/Caelum
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Copyright (c) 2008 Caelum team. See Contributors.txt for details.
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Caelum is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Caelum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with Caelum. If not, see <http://www.gnu.org/licenses/>.
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*/
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void StarPointVP
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(
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in float4 in_position : POSITION,
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in float3 in_texcoord : TEXCOORD0,
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uniform float4x4 worldviewproj_matrix,
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// These params are in clipspace; not pixels
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uniform float mag_scale,
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uniform float mag0_size,
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uniform float min_size,
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uniform float max_size,
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uniform float render_target_flipping,
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// width/height
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uniform float aspect_ratio,
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out float2 out_texcoord : TEXCOORD0,
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out float4 out_position : POSITION,
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out float4 out_color : COLOR
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)
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{
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float4 in_color = float4(1, 1, 1, 1);
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out_position = mul(worldviewproj_matrix, in_position);
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out_texcoord = in_texcoord.xy;
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float magnitude = in_texcoord.z;
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float size = exp(mag_scale * magnitude) * mag0_size;
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// Fade below minSize.
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float fade = saturate(size / min_size);
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out_color = float4(in_color.rgb, fade * fade);
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// Clamp size to range.
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size = clamp(size, min_size, max_size);
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// Splat the billboard on the screen.
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out_position.xy +=
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out_position.w *
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in_texcoord.xy *
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float2(size, size * aspect_ratio * render_target_flipping);
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}
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void StarPointFP
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(
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in float4 in_color : COLOR,
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in float2 in_texcoord : TEXCOORD0,
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out float4 out_color : COLOR
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)
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{
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out_color = in_color;
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float sqlen = dot(in_texcoord, in_texcoord);
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// A gaussian bell of sorts.
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out_color.a *= 1.5 * exp(-(sqlen * 8));
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}
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