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25 lines
1.0 KiB
GLSL
25 lines
1.0 KiB
GLSL
// soft particles (opengl46_gpu_particles): a particle fades where it nears what is behind it, instead of being cut by it.
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// the resolved depth of the scene drawn so far (gl::SCENE_DEPTH_TEX), reversed with the far plane at infinity: the distance
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// along the axis of the view is the near plane over the depth, and the sky, which writes no depth, stays at 0
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#ifndef PARTICLE_SOFT_GLSL
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#define PARTICLE_SOFT_GLSL
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layout(binding = SCENE_DEPTH_TEX) uniform sampler2D particle_scene_depth;
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// share of the particle left at the fragment, 0-1: Range (metres) is how far in front of the scene it fades out over, 0 for none.
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// Fragdistance: of the fragment along the axis of the view
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float particle_soft_fade(float range, float fragdistance)
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{
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if (range <= 0.0)
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return 1.0;
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float depth = texelFetch(particle_scene_depth, ivec2(gl_FragCoord.xy), 0).r;
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if (depth <= 0.0)
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return 1.0;
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float scene = projection[3][2] / depth;
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float share = clamp((scene - fragdistance) / range, 0.0, 1.0);
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return share * share * (3.0 - 2.0 * share);
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}
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#endif
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