64 lines
1.3 KiB
Plaintext
64 lines
1.3 KiB
Plaintext
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shader_type particles;
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uniform float map_size = 128.0;
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uniform sampler2D height_sampler : hint_black;
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uniform float height_scale = 1.0;
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uniform float height_offset = 0.0;
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uniform sampler2D noise_sampler_A;
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uniform sampler2D noise_sampler_B;
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uniform float rows = 4;
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uniform float spacing = 1.5;
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float height(vec2 position)
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{
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position /= map_size;
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position += 0.5;
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return texture(height_sampler, position).r * height_scale + height_offset * 0.5;
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}
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void vertex()
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{
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vec3 pos = vec3(0.0);
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pos.z = float(INDEX);
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pos.x = mod(pos.z, rows);
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pos.z = (pos.z - pos.x) / rows;
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pos.x -= rows * 0.5;
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pos.z -= rows * 0.5;
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pos *= spacing;
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pos.x += EMISSION_TRANSFORM[3][0] - mod(EMISSION_TRANSFORM[3][0], spacing);
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pos.z += EMISSION_TRANSFORM[3][2] - mod(EMISSION_TRANSFORM[3][2], spacing);
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vec3 noise_A = texture(noise_sampler_A, pos.xz * 0.01).rgb;
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pos.x += noise_A.x * spacing;
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pos.z += noise_A.y * spacing;
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pos.y = height(pos.xz);
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if (pos.y > -1.8) { pos.y = -10000.0; }
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float noise_B = texture(noise_sampler_B, pos.xz * 0.01).r;
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if (noise_B < 0.5) { pos.y = -10000.0; }
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TRANSFORM[0][0] = cos(noise_A.z * 3.0);
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TRANSFORM[0][2] = -sin(noise_A.z * 3.0);
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TRANSFORM[2][0] = sin(noise_A.z * 3.0);
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TRANSFORM[2][2] = cos(noise_A.z * 3.0);
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TRANSFORM[3][0] = pos.x;
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TRANSFORM[3][1] = pos.y;
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TRANSFORM[3][2] = pos.z;
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}
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