49 lines
1.5 KiB
Plaintext
49 lines
1.5 KiB
Plaintext
// SPDX-License-Identifier: MIT
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// SPDX-FileCopyrightText: 2023 MizunagiKB <mizukb@live.jp>
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// GDCubism shader: Mask + Mul
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shader_type canvas_item;
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render_mode blend_mul, unshaded;
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uniform vec4 color_base : source_color;
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uniform vec4 color_screen : source_color;
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uniform vec4 color_multiply : source_color;
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uniform vec4 channel : source_color;
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uniform sampler2D tex_main : filter_linear_mipmap;
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uniform sampler2D tex_mask : filter_linear_mipmap;
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uniform float mask_scale;
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uniform vec2 canvas_size;
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uniform vec2 mesh_offset;
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varying vec2 MASK_UV;
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varying vec4 modulate;
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void vertex() {
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vec2 mask_size = vec2(textureSize(tex_mask, 0)) / mask_scale;
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vec2 mask_vtx = VERTEX - mesh_offset;
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MASK_UV = mask_vtx / mask_size;
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modulate = COLOR;
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}
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void fragment() {
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vec4 color_tex = texture(tex_main, UV);
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color_tex.rgb = color_tex.rgb * color_multiply.rgb;
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// premul alpha
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color_tex.rgb = color_tex.rgb + color_screen.rgb - (color_tex.rgb * color_screen.rgb);
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vec4 color_for_mask = color_tex * color_base * modulate;
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color_for_mask.rgb = color_for_mask.rgb * color_for_mask.a;
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vec4 clip_mask = texture(tex_mask, MASK_UV) * channel;
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float mask_val = clip_mask.r + clip_mask.g + clip_mask.b + clip_mask.a;
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color_for_mask = color_for_mask * mask_val;
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COLOR = vec4(
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color_for_mask.r + (1.0 - color_for_mask.a),
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color_for_mask.g + (1.0 - color_for_mask.a),
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color_for_mask.b + (1.0 - color_for_mask.a),
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1.0
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);
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}
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